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Document and Entity Information Document - USD ($)	12 Months Ended
Document and Entity Information Document - USD ($)	Jul. 31, 2015	Sep. 01, 2015	Jan. 31, 2015
Document Information [Abstract]
Entity Registrant Name	Palo Alto Networks Inc
Entity Central Index Key	0001327567
Document Type	10-K
Document Period End Date	Jul. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Document Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		85,008,892
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 9,283,109,783

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Current assets:
Cash and cash equivalents	$ 375,814	$ 653,812
Short-term investments	413,165	118,690
Accounts receivable, net of allowance for doubtful accounts of $723 and $471 at July 31, 2015 and July 31, 2014, respectively	212,366	135,518
Prepaid expenses and other current assets	72,685	50,306
Total current assets	1,074,030	958,326
Property and equipment, net	62,878	48,744
Long-term investments	538,841	201,880
Goodwill	163,522	155,033
Intangible assets, net	52,656	47,955
Other assets	73,251	66,528
Total assets	1,965,178	1,478,466
Current liabilities:
Accounts payable	13,204	14,526
Accrued compensation	79,795	48,727
Accrued and other liabilities	28,291	25,000
Deferred revenue	423,853	259,918
Convertible senior notes, net	487,084	0
Total current liabilities	1,032,227	348,171
Convertible senior notes, net	0	466,875
Long-term deferred revenue	289,801	162,660
Other long-term liabilities	67,335	32,177
Commitments and contingencies (Note 8)
Temporary equity	87,916	0
Stockholders’ equity:
Preferred stock, $0.0001 par value; 100,000 shares authorized; none issued and outstanding at July 31, 2015 and July 31, 2014	0	0
Common stock, $0.0001 par value; 1,000,000 shares authorized; 84,788 and 79,519 shares issued and outstanding at July 31, 2015 and July 31, 2014, respectively	8	8
Additional paid-in capital	988,687	804,406
Accumulated other comprehensive loss	(88)	(105)
Accumulated deficit	(500,708)	(335,726)
Total stockholders’ equity	487,899	468,583
Total liabilities, temporary equity, and stockholders’ equity	$ 1,965,178	$ 1,478,466

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Current assets:
Allowance for doubtful accounts	$ 723	$ 471
Stockholders’ equity:
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued (in shares)	84,788,000	79,519,000
Common Stock, Shares, Outstanding (in shares)	84,788,000	79,519,000

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Revenue:
Product	$ 154,037	$ 121,524	$ 115,621	$ 101,476	$ 99,707	$ 84,128	$ 80,823	$ 75,485	$ 492,658	$ 340,143	$ 243,707
Services	129,842	112,648	102,034	90,870	78,524	66,572	60,245	52,695	435,394	258,036	152,400
Total revenue	283,879	234,172	217,655	192,346	178,231	150,700	141,068	128,180	928,052	598,179	396,107
Cost of revenue:
Product	38,462	32,851	30,640	29,141	26,903	20,425	20,221	17,954	131,094	85,503	63,412
Services	35,856	31,544	28,685	24,320	21,704	19,285	17,283	15,853	120,405	74,125	46,344
Total cost of revenue	74,318	64,395	59,325	53,461	48,607	39,710	37,504	33,807	251,499	159,628	109,756
Total gross profit	209,561	169,777	158,330	138,885	129,624	110,990	103,564	94,373	676,553	438,551	286,351
Operating expenses:
Research and development	53,089	48,486	46,948	37,305	32,830	27,837	24,253	19,893	185,828	104,813	62,482
Sales and marketing	162,429	131,026	122,875	106,366	106,668	83,995	76,734	67,366	522,696	334,763	199,771
General and administrative	28,576	26,989	27,023	18,977	15,574	23,717	19,733	14,125	101,565	73,149	42,719
Legal settlement (Note 9)					0	121,173	20,000	0	0	141,173	0
Total operating expenses	244,094	206,501	196,846	162,648	155,072	256,722	140,720	101,384	810,089	653,898	304,972
Operating loss	(34,533)	(36,724)	(38,516)	(23,763)	(25,448)	(145,732)	(37,156)	(7,011)	(133,536)	(215,347)	(18,621)
Interest expense	(5,666)	(5,631)	(5,539)	(5,489)	(1,848)	(13)	(14)	(8)	(22,325)	(1,883)	(74)
Other income (expense), net	(346)	(55)	344	341	(5,595)	430	(170)	405	284	(4,930)	39
Loss before income taxes	(40,545)	(42,410)	(43,711)	(28,911)	(32,891)	(145,315)	(37,340)	(6,614)	(155,577)	(222,160)	(18,656)
Provision for income taxes	5,426	3,525	(703)	1,157	(833)	1,272	2,606	1,247	9,405	4,292	10,590
Net loss	$ (45,971)	$ (45,935)	$ (43,008)	$ (30,068)	$ (32,058)	$ (146,587)	$ (39,946)	$ (7,861)	$ (164,982)	$ (226,452)	$ (29,246)
Net loss per share, basic and diluted	$ (0.55)	$ (0.56)	$ (0.53)	$ (0.38)	$ (0.41)	$ (1.96)	$ (0.55)	$ (0.11)	$ (2.02)	$ (3.05)	$ (0.43)
Weighted-average shares used to compute net loss per share, basic and diluted									81,619	74,291	68,682

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Net loss	$ (164,982)	$ (226,452)	$ (29,246)
Other comprehensive income (loss), net of tax:
Change in unrealized gains (losses) on investments	30	(72)	(15)
Reclassification adjustment for realized net gains on investments included in net loss	(13)	(17)	(1)
Net change	17	(89)	(16)
Comprehensive loss	$ (164,965)	$ (226,541)	$ (29,262)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Common stock, beginning balance (in shares) at Jul. 31, 2012		67,852
Beginning balance at Jul. 31, 2012	$ 229,071	$ 7	$ 309,092	$ 0	$ (80,028)
Increase (Decrease) in Stockholders' Equity
Net loss	(29,246)				(29,246)
Other comprehensive income (loss)	(16)			(16)
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit (in shares)		3,760
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit	28,907	$ 0	28,907
Share-based compensation for equity based awards	43,704		43,704
Common stock, ending balance (in shares) at Jul. 31, 2013		71,612
Ending balance at Jul. 31, 2013	272,420	$ 7	381,703	(16)	(109,274)
Increase (Decrease) in Stockholders' Equity
Net loss	(226,452)				(226,452)
Other comprehensive income (loss)	(89)			(89)
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit (in shares)		4,806
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit	48,002	$ 1	48,001
Share-based compensation for equity based awards	99,774		99,774
Issuance of common stock in connection with legal settlement (in shares)		1,544
Issuance of common stock in connection with legal settlement	113,332	$ 0	113,332
Issuance of common stock in connection with acquisition (in shares)		1,557
Issuance of common stock in connection with acquisition	87,477	$ 0	87,477
Equity component of convertible senior notes, net	106,836		106,836
Purchase of convertible senior note hedges	(110,975)		(110,975)
Issuance of warrants	$ 78,258		78,258
Common stock, ending balance (in shares) at Jul. 31, 2014	79,519	79,519
Ending balance at Jul. 31, 2014	$ 468,583	$ 8	804,406	(105)	(335,726)
Increase (Decrease) in Stockholders' Equity
Net loss	(164,982)				(164,982)
Other comprehensive income (loss)	17			17
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit (in shares)		5,269
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit	50,882	$ 0	50,882
Share-based compensation for equity based awards	221,315		221,315
Temporary equity reclassification	$ (87,916)		(87,916)
Common stock, ending balance (in shares) at Jul. 31, 2015	84,788	84,788
Ending balance at Jul. 31, 2015	$ 487,899	$ 8	$ 988,687	$ (88)	$ (500,708)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Cash flows from operating activities
Net loss	$ (164,982)	$ (226,452)	$ (29,246)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation for equity based awards	221,315	99,774	43,704
Issuance of common stock for legal settlement	0	46,173	0
Depreciation and amortization	28,881	19,419	9,892
Amortization of investment premiums, net of accretion of purchase discounts	3,161	1,518	1,943
Amortization of debt discount and debt issuance costs	22,265	1,826	0
Change in fair value of common stock warrant	0	5,859	0
Excess tax benefit from share-based compensation arrangements	(2,455)	(957)	(6,762)
Loss on facility sublease	0	0	262
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	(76,830)	(47,949)	(41,819)
Prepaid expenses and other assets	(34,185)	(10,308)	(8,865)
Accounts payable	(3,498)	(1,100)	5,830
Accrued compensation	31,068	26,331	10,697
Accrued and other liabilities	34,488	1,076	15,461
Deferred revenue	291,076	173,196	113,422
Net cash provided by operating activities	350,304	88,406	114,519
Cash flows from investing activities
Purchases of investments	(987,598)	(506,642)	(345,324)
Proceeds from sales of investments	18,508	74,597	13,491
Proceeds from maturities of investments	339,040	233,530	202,710
Business acquisitions, net of cash acquired	(15,128)	(85,726)	0
Purchases of property, equipment, and other assets	(33,828)	(36,107)	(22,442)
Net cash used in investing activities	(679,006)	(320,348)	(151,565)
Cash flows from financing activities
Proceeds from borrowings on convertible senior notes, net	0	560,433	0
Proceeds from issuance of warrants	0	78,258	0
Purchase of convertible note hedges	0	(110,975)	0
Proceeds from sales of shares through employee equity incentive plans	48,249	46,599	21,032
Excess tax benefit from share-based compensation arrangements	2,455	957	6,762
Payments of initial public offering costs	0	0	(2,698)
Repurchases of restricted common stock from terminated employees	0	(132)	(78)
Net cash provided by financing activities	50,704	575,140	25,018
Net increase (decrease) in cash and cash equivalents	(277,998)	343,198	(12,028)
Cash and cash equivalents—beginning of period	653,812	310,614	322,642
Cash and cash equivalents—end of period	375,814	653,812	310,614
Supplemental disclosures of cash flow information
Cash paid for income taxes	17,530	1,523	304
Cash paid for interest	61	44	58
Non-cash investing and financing activities
Issuance of common stock in connection with acquisition	$ 0	$ 87,477	$ 0

Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Jul. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Summary of Significant Accounting Policies

Description of Business

Palo Alto Networks, Inc. (the “Company,” “we,” “us,” or “our”), located in Santa Clara, California, was incorporated in March 2005 under the laws of the State of Delaware and commenced operations in April 2005. We offer a next-generation security platform that empowers enterprises, service providers, and government entities to secure their organizations by safely enabling the increasingly complex and rapidly growing number of applications running on their networks and by preventing breaches in real-time that stem from targeted cyber attacks.

Basis of Presentation

The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP). The consolidated financial statements include all adjustments necessary for a fair presentation of our annual results. All adjustments are of a normal recurring nature. Certain prior period amounts have been reclassified to conform with current period presentation.

Principles of Consolidation

The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Such management estimates include, but are not limited to the best estimate of selling price for our products and services, share-based compensation, fair value of assets acquired and liabilities assumed in business combinations, the assessment of recoverability of our property and equipment, identified intangibles and goodwill, future taxable income, contract manufacturer liabilities, and loss contingencies. We base our estimates on historical experience and also on assumptions that we believe are reasonable. Actual results could differ materially from those estimates.

Concentrations

Financial instruments that subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments, and accounts receivable. We invest only in high-quality credit instruments and maintain our cash and cash equivalents and available-for-sale investments in fixed income securities. Management believes that the financial institutions that hold our investments are financially sound and, accordingly, are subject to minimal credit risk. Deposits held with banks may exceed the amount of insurance provided on such deposits.

Our accounts receivables are primarily derived from our channel partners representing various geographical locations. We perform ongoing credit evaluations of our channel partners and generally do not require collateral on accounts receivable. We maintain an allowance for doubtful accounts for estimated potential credit losses. As of July 31, 2015, two channel partners represented 36% and 30% of our gross accounts receivable. For fiscal 2015, three channel partners represented 31%, 29%, and 11% of our total revenue. We rely on an independent contract manufacturer to assemble most of our products and sole suppliers for a certain number of our components.

Comprehensive Loss

Comprehensive loss is comprised of net loss and other comprehensive income (loss). Unrealized gains and losses on available-for-sale investments are included in our other comprehensive income or loss.

Foreign Currency Transactions

The functional currency of our foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities denominated in foreign currencies have been remeasured into U.S. dollars using the exchange rates in effect at the balance sheet dates. Foreign currency denominated income and expenses have been remeasured using the average exchange rates in effect during each period. Foreign currency remeasurement gains and losses and foreign currency transaction gains and losses are not significant to the financial statements.

Cash and Cash Equivalents

We consider all highly liquid investments held at financial institutions, such as commercial paper, money market funds, and other money market securities with original maturities of three months or less at date of purchase to be cash equivalents.

Fair Value

We define fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, we consider the principal or most advantageous market in which to transact and the market-based risk. We apply fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. The carrying amounts reported in the consolidated financial statements approximate the fair value for cash and cash equivalents, accounts receivable, accounts payable, and accrued liabilities, due to their short-term nature.

Investments

We classify our investments as available-for-sale at the time of purchase since it is our intent that these investments are available for current operations, and include these investments on our consolidated balance sheet as either short-term or long-term investments depending on their maturity. Investments not considered cash equivalents and with maturities one year or less from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments.

Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. We consult with our investment managers and consider available quantitative and qualitative evidence in evaluating potential impairment of our investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, we evaluate, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and our intent and ability to hold the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.

Accounts Receivable

Trade accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on our assessment of the collectability of accounts. Management regularly reviews the adequacy of the allowance for doubtful accounts by considering the age of each outstanding invoice, each channel partner’s expected ability to pay, and the collection history with each channel partner, when applicable, to determine whether a specific allowance is appropriate. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified. As of July 31, 2015 and 2014, the allowance for doubtful accounts activity was not significant.

Property and Equipment

Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, generally three to ten years. Leasehold improvements are depreciated over the shorter of the estimated useful lives of the improvements or the remaining lease term.

Business Combinations

We include the results of operations of the businesses that we acquire as of the respective dates of acquisition. We allocate the fair value of the purchase price of our acquisitions to the tangible assets acquired, liabilities assumed, and intangible assets acquired, based on their estimated fair values. The excess of the purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill. Additional information existing as of the acquisition date but unknown to us may become known during the remainder of the measurement period, not to exceed 12 months from the acquisition date, which may result in changes to the amounts and allocations recorded.

Amortization of Intangible Assets

Purchased intangible assets with finite lives are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets. Acquisition-related in-process research and development represents the fair value of incomplete research and development projects that have not reached technological feasibility as of the date of acquisition. Initially, these assets are not subject to amortization. Assets related to projects that have been completed are transferred to developed technology, which are subject to amortization.

Impairment of Goodwill, Intangible Assets, and Long-Lived Assets

Goodwill is evaluated for impairment on an annual basis in the fourth quarter of our fiscal year, and whenever events or changes in circumstances indicate the carrying amount of goodwill may not be recoverable. We have elected to first assess qualitative factors to determine whether it is more likely than not that the fair value of our single reporting unit is less than its carrying amount. If we determine that it is more likely than not that the fair value of our single reporting unit is less than its carrying amount, then the two-step goodwill impairment test will be performed. The first step, identifying a potential impairment, compares the fair value of our single reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step will be performed; otherwise, no further step is required. The second step, measuring the impairment loss, compares the implied fair value of the goodwill with the carrying amount of the goodwill. Any excess of the goodwill carrying amount over the implied fair value is recognized as an impairment loss.

We evaluate events and changes in circumstances that could indicate carrying amounts of purchased intangible assets and long-lived assets may not be recoverable. When such events or changes in circumstances occur, we assess the recoverability of these assets by determining whether or not the carrying amount will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, we record an impairment loss for the amount by which the carrying amount of the asset exceeds the fair value of the asset.

Through July 31, 2015, we have not recognized any impairment losses on our goodwill, intangible assets, and long-lived assets.

Contract Manufacturer Liabilities

We outsource most of our manufacturing, repair, and supply chain management operations to our independent contract manufacturer and payments to it are a significant portion of our product cost of revenues. Although we could be contractually obligated to purchase manufactured products, we generally do not own the manufactured products. Product title transfers from our independent contract manufacturer to us and immediately to our channel partners upon shipment. Our independent contract manufacturer assembles our products using design specifications, quality assurance programs, and standards that we establish and it procures components and assembles our products based on our demand forecasts. These forecasts represent our estimates of future demand for our products based upon historical trends and analysis from our sales and product management functions as adjusted for overall market conditions. If the actual component usage and product demand are significantly lower than forecast, we accrue for costs for contractual manufacturing commitments in excess of our forecasted demand including costs for excess components or for carrying costs incurred by our contract manufacturer. Through July 31, 2015, we have not accrued any significant costs associated with this exposure.

Convertible Senior Notes

On June 30, 2014, we issued $575.0 million aggregate principal amount of 0.0% Convertible Senior Notes due 2019 (the “Notes”). In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. This difference represents a debt discount that is amortized to interest expense using the effective interest method over the term of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes. Transaction costs attributable to the liability component are being amortized to interest expense using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were netted with the equity component of the Notes in additional paid-in capital in the consolidated balance sheets.

When the Notes are convertible, the net carrying amount of the Notes and related debt issuance costs will be classified as current liabilities and current assets, respectively, in our consolidated balance sheets. In addition, a portion of the equity component representing the conversion option will be reclassified to temporary equity in our consolidated balance sheets.

Revenue Recognition

We generate revenue from the sales of hardware and software products, subscriptions, support and maintenance, and other services primarily through a direct sales force and indirect relationships with channel partners, and, to a lesser extent, directly to end-customers.

Revenue is recognized when all of the following criteria are met:


•	Persuasive Evidence of an Arrangement Exists. We rely upon non-cancelable sales agreements and purchase orders to determine the existence of an arrangement.


•	Delivery has Occurred. We use shipping documents or transmissions of product or service contract registration codes to determine delivery.


•	The Fee is Fixed or Determinable. We assess whether the fee is fixed or determinable based on the payment terms associated with the transaction.


•	Collectability is Reasonably Assured. We assess collectability based on credit analysis and payment history.

We recognize product revenue at the time of shipment provided that all other revenue recognition criteria have been met. Our channel partners generally receive an order from an end-customer prior to placing an order with us. In addition, payment from our channel partners is not contingent on the partner’s success in sales to end-customers. Our channel partners generally do not stock appliances and only have limited stock rotation rights and no price protection rights. When necessary, we make certain estimates and maintain allowances for sales returns and other programs based on our historical experience. To date, these estimates have not been significant. We recognize services revenue from subscriptions and support and maintenance ratably over the contractual service period, which is typically one to five years. Other services revenue is recognized as the services are rendered.

Most of our arrangements, other than renewals of subscriptions and support and maintenance, are multiple-element arrangements with a combination of hardware, software, subscriptions, support and maintenance, and other services. Products and services generally qualify as separate units of accounting. Our hardware deliverables typically include proprietary operating system software, which together deliver the essential functionality of our products. For multiple-element arrangements, we allocate revenue to each unit of accounting based on an estimated selling price at the arrangement inception. The estimated selling price for each element is based upon the following hierarchy: vendor-specific objective evidence (VSOE) of selling price, if available, third-party evidence (TPE) of selling price, if VSOE of selling price is not available, or best estimate of selling price (BESP), if neither VSOE of selling price nor TPE of selling price are available. The total arrangement consideration is allocated to each separate unit of accounting using the relative estimated selling prices of each unit based on the aforementioned selling price hierarchy. We limit the amount of revenue recognized for delivered elements to an amount that is not contingent upon future delivery of additional products or services or meeting of any specified performance conditions.

In multiple-element arrangements where software deliverables are included, revenue is allocated to each separate unit of accounting for each of the non-software deliverables and to the software deliverables as a group using the relative estimated selling prices of each of the deliverables in the arrangement based on the aforementioned estimated selling price hierarchy. The arrangement consideration allocated to the software deliverables as a group is then allocated to each software deliverable using the residual method when VSOE of fair value of the undelivered items exists. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration less the aggregate fair value of any undelivered elements. In determining VSOE of fair value, we evaluate whether a substantial majority of the historical prices charged for a product or service sold on a standalone basis, as represented by a percentage of list price, fall within a reasonably narrow range. If VSOE of fair value of one or more undelivered items does not exist, revenue from the software portion of the arrangement is deferred and recognized at the earlier of: (i) delivery of those elements or (ii) when fair value can be established unless support and maintenance is the only undelivered element, in which case, the entire software arrangement fee is recognized ratably over the contractual service period.

We account for multiple agreements with a single partner as one arrangement if the contractual terms and/or substance of those agreements indicate that they may be so closely related that they are, in effect, parts of a single arrangement.

Revenues are reported net of sales taxes. Shipping charges billed to channel partners are included in revenues and related costs are included in cost of revenue. Sales commissions and other incremental costs to acquire contracts are also expensed as incurred. After receipt of a partner order, any amounts billed in excess of revenue recognized are recorded as deferred revenue.

Advertising Costs

Advertising costs, which are expensed and included in sales and marketing expense when incurred, were $4.8 million, $3.7 million, and $1.8 million, during the years ended July 31, 2015, 2014, and 2013, respectively.

Software Development Costs

Internally developed software includes enterprise-level business software that we are customizing to meet our specific operational needs. These capitalized costs consisted of the external direct costs and the internal payroll and payroll related costs that are related to the implementation of our enterprise resource planning software system and will be amortized over a useful life of three to five years.

The costs to develop software that is marketed externally have not been capitalized as we believe our current software development process is essentially completed concurrent with the establishment of technological feasibility. As such, all related software development costs are expensed as incurred and included in research and development expense in our consolidated statements of operations.

Share-Based Compensation

Compensation expense related to share-based transactions, including employee and non-employee director awards, is measured and recognized in the financial statements based on fair value on the grant date. We recognize share-based compensation expense, net of estimated forfeitures, on a straight-line basis over the requisite service periods of the related awards.

Leases

We rent our facilities under operating lease agreements and recognize related rent expense on a straight-line basis over the term of the lease. Some of our lease agreements contain rent holidays, scheduled rent increases, lease incentives, and renewal options. Rent holidays and scheduled rent increases are included in the determination of rent expense to be recorded over the lease term. Lease incentives are recognized as a reduction of rent expense on a straight-line basis over the term of the lease. Renewals are not assumed in the determination of the lease term unless they are deemed to be reasonably assured at the inception of the lease. We begin recognizing rent expense on the date that we obtain the legal right to use and control the leased space.

Income Taxes

We account for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our financial statements or tax returns. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carryforwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.

Significant judgment is required in determining any valuation allowance recorded against deferred tax assets. In assessing the need for a valuation allowance, we consider all available evidence, including past operating results, estimates of future taxable income, and the feasibility of tax planning strategies. In the event that we change our determination as to the amount of deferred tax assets that can be realized, we will adjust our valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made.

We apply the authoritative accounting guidance prescribing a threshold and measurement attribute for the financial recognition and measurement of a tax position taken or expected to be taken in a tax return. We recognize liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step requires us to estimate and measure the tax benefit as the largest amount that is more likely than not to be realized upon ultimate settlement.

Loss Contingencies

We are subject to the possibility of various loss contingencies arising in the ordinary course of business. In determining loss contingencies, we consider the likelihood of loss or impairment of an asset, or the incurrence of a liability, as well as our ability to reasonably estimate the amount of loss. An estimated loss contingency is accrued when it is probable that an asset has been impaired or a liability has been incurred and the amount of loss can be reasonably estimated. If we determine that a loss is possible and the range of the loss can be reasonably determined, then we disclose the range of the possible loss. We regularly evaluate current information available to us to determine whether an accrual is required, an accrual should be adjusted or a range of possible loss should be disclosed.

Recent Accounting Pronouncements

In April 2015, the Financial Accounting Standards Board (FASB) issued new authoritative guidance on fees paid in a cloud computing arrangement. The standard requires customers in a cloud computing arrangement to evaluate whether the arrangement includes a software license. If the arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. The standard is effective for us for our first quarter of fiscal 2017, although early adoption is permitted, and will be applied on either a prospective or retrospective basis. We are currently evaluating adoption methods and whether this standard will have a material impact on our consolidated financial statements.

In April 2015, the FASB issued updated authoritative guidance to simplify the presentation of debt issuance costs. The amended standard requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the related debt liability, consistent with the presentation of debt discounts, instead of being presented as an asset. The amended standard is effective for us for our first quarter of fiscal 2017, although early adoption is permitted, and will be applied on a retrospective basis. We do not expect the adoption of the standard will have a material impact on our consolidated financial statements.

In May 2014, the FASB issued new authoritative guidance on revenue from contracts with customers. The new standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires significantly expanded disclosures about revenue recognition. In July 2015, the FASB decided to delay the effective date of the new standard by one year. The guidance is now effective for us for our first quarter of fiscal 2019 using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within the guidance; or (ii) retrospective with the cumulative effect of initially applying the guidance recognized at the date of initial application and providing certain additional disclosures as defined per the guidance. Early adoption as of the original effective date is permitted. We are currently evaluating adoption methods and whether this standard will have a material impact on our consolidated financial statements.

In July 2013, the FASB issued new authoritative guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The standard requires us to present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss (NOL) carryforward or other tax credit carryforward when settlement in this manner is available under applicable tax law. The guidance was effective for us in the first quarter of fiscal 2015. Our adoption of this guidance did not have an impact on our consolidated financial statements.

Fair Value Measurements

12 Months Ended

Jul. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

We categorize assets and liabilities recorded at fair value on our consolidated balance sheets based upon the level of judgment associated with inputs used to measure their fair value. The categories are as follows:


•	Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.


•	Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.


•	Level 3—Inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.

The following table presents the fair value of our financial assets and liabilities using the above input categories as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31, 2015								July 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Short-term investments:
Certificates of deposit	$	—	$	1,000	$	—	$	1,000	$	—	$	—	$	—	$	—
Corporate debt securities	—		97,825		—		97,825		—		22,239		—		22,239
U.S. government and agency securities	—		314,340		—		314,340		—		96,451		—		96,451
Total short-term investments	—		413,165		—		413,165		—		118,690		—		118,690
Long-term investments:
Certificates of deposit	—		—		—		—		—		1,000		—		1,000
Corporate debt securities	—		92,902		—		92,902		—		39,018		—		39,018
U.S. government and agency securities	—		445,939		—		445,939		—		161,862		—		161,862
Total long-term investments	—		538,841		—		538,841		—		201,880		—		201,880
Other assets:
Certificates of deposit	—		—		—		—		1,220		—		—		1,220
Total other assets	—		—		—		—		1,220		—		—		1,220
Total assets measured at fair value	$	—	$	952,006	$	—	$	952,006	$	1,220	$	320,570	$	—	$	321,790

Refer to Note 7. Convertible Senior Notes for the carrying amount and estimated fair value of our convertible senior notes as of July 31, 2015.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Investments

12 Months Ended

Jul. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investments

The following tables summarize the unrealized gains and losses and fair value of our investments as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1,000	$	—	$	—		$	1,000
Corporate debt securities	190,882		24		(179		)	190,727
U.S. government and agency securities	760,212		271		(204		)	760,279
Total	$	952,094	$	295	$	(383	)	$	952,006



	July 31, 2014
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1,000	$	—	$	—		$	1,000
Corporate debt securities	61,299		16		(58		)	61,257
U.S. government and agency securities	258,376		45		(108		)	258,313
Total	$	320,675	$	61	$	(166	)	$	320,570

The following tables present our investments that were in an unrealized loss position as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31, 2015
	Less Than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	134,976	$	(179	)	$	—	$	—	$	134,976	$	(179	)
U.S. government and agency securities	348,991		(204		)	—		—		348,991		(204		)
Total	$	483,967	$	(383	)	$	—	$	—	$	483,967	$	(383	)



	July 31, 2014
	Less Than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	43,868	$	(58	)	$	—	$	—	$	43,868	$	(58	)
U.S. government and agency securities	142,490		(108		)	—		—		142,490		(108		)
Total	$	186,358	$	(166	)	$	—	$	—	$	186,358	$	(166	)

Unrealized losses related to these investments are due to interest rate fluctuations as opposed to credit quality. In addition, we do not intend to sell and it is not likely that we would be required to sell these investments before recovery of their amortized cost basis, which may be at maturity. As a result, there is no other-than-temporary impairment for these investments at July 31, 2015 and 2014.

We received proceeds of $18.5 million, $74.6 million, and $13.5 million from sales of investments during the years ended July 31, 2015, 2014, and 2013, respectively. We use the specific identification method to determine the cost basis of investments sold.

The following table summarizes the amortized cost and fair value of our investments as of July 31, 2015, by contractual years-to-maturity (in thousands):



	Amortized Cost		Fair Value
Due within one year	$	413,148	$	413,165
Due between one and three years	538,946		538,841
Total	$	952,094	$	952,006

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Acquisitions

12 Months Ended

Jul. 31, 2015

Business Combinations [Abstract]

Acquisitions

Business Combinations

Fiscal 2015

CirroSecure, Inc.

On May 22, 2015, we completed our acquisition of CirroSecure, Inc. (“CirroSecure”), a privately-held cybersecurity company. The acquisition expands the functionality of our next-generation security platform by providing additional security for SaaS applications. We have accounted for this transaction as a business combination in exchange for total cash consideration of $15.3 million.

We allocated the purchase consideration to the assets acquired and liabilities assumed based on their estimated fair values and as a result, recorded a developed technology intangible asset of $11.0 million, goodwill of $8.1 million, and net liabilities of $3.8 million in our consolidated balance sheets as of the acquisition date. The developed technology will be amortized over an estimated useful life of seven years. The goodwill is attributable to the assembled workforce and expected post-acquisition synergies and is not deductible for income tax purposes.

Adjustments to the allocation of the purchase consideration, specifically income taxes payable and deferred taxes, may be required as additional information is received and certain tax returns are finalized. We expect to finalize the allocation of the purchase consideration to the assets acquired and liabilities assumed as soon as practicable, but not later than 12 months from the acquisition date.

CirroSecure’s operating results are included in our consolidated statements of operations from the date of the acquisition and are considered immaterial for purposes of pro forma financial disclosures.

Fiscal 2014

Cyvera Ltd.

On April 9, 2014, we completed our acquisition of Cyvera Ltd. (“Cyvera”), a privately-held cybersecurity company located in Tel Aviv, Israel. The acquisition extends our next-generation security platform with an innovative approach to preventing attacks on the endpoint. We have accounted for this transaction as a business combination in exchange for total consideration of approximately $177.6 million, which consisted of the following (in thousands):



	Amount
Cash	$	90,170
Common stock (1.3 million shares)	87,477
Total	$	177,647

As part of the acquisition, we agreed to replace Cyvera's unvested options with our restricted stock units with an estimated fair value of $6.4 million. Of the total estimated fair value, a portion was allocated to the purchase consideration and the remainder was allocated to future services and will be expensed over the remaining service periods on a straight-line basis as share-based compensation.

In addition, we issued 0.3 million shares of restricted common stock with a total fair value of $17.6 million to certain Cyvera employees. The restriction on these shares will be released over a period of three years from the acquisition date, subject to continued employment. These shares were excluded from the purchase consideration and are being expensed over the remaining service periods on a straight-line basis as share-based compensation.

We expensed the related acquisition costs in the amount of $3.9 million in general and administrative expenses for the year ended July 31, 2014.

The following table summarizes our allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):



	Amount
Cash	$	6,930
Goodwill	145,275
Identified intangible assets	42,300
Accrued and other liabilities, net	(6,950		)
Long-term deferred tax liability, net	(9,908		)
Total	$	177,647

The fair values of assets acquired and liabilities assumed in the table above have been adjusted to reflect changes due to tax returns filed during the measurement period.

The following table presents details of the identified intangible assets acquired as of the date of acquisition (in thousands, except years):



	Fair Value		Estimated Useful Life
Developed technology	$	34,500	7 years
In-process research and development	7,600		N/A
Other	200		2 years
Total	$	42,300

Goodwill generated from this business combination is primarily attributable to the assembled workforce and synergies from combined selling opportunities of both network security products and endpoint security products. The goodwill is not deductible for income tax purposes.

The following table presents the unaudited pro forma financial information for the years ended July 31, 2014 and 2013, as though the companies were combined as of August 1, 2012 (in thousands):



	Year Ended July 31,
	2014			2013
Total revenue	$	598,254		$	396,131
Net loss	$	(241,920	)	$	(43,041	)

The pro forma financial information for the years ended July 31, 2014 and 2013 has been calculated after adjusting our results and those of Cyvera to reflect the business combination accounting effects resulting from this acquisition as though the acquisition occurred as of August 1, 2012, including acquisition related transaction costs, the amortization expense from acquired intangible assets, and post-acquisition share-based compensation expense related to restricted common stock and the replacement of unvested Cyvera options. The pro forma financial information is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of our fiscal 2013.

The pro forma financial information for the years ended July 31, 2014 and 2013 combines our historical results for the years ended July 31, 2014 and 2013 and the adjusted historical results of Cyvera for the twelve months ended June 30, 2014 and 2013, due to differences in reporting periods and considering the date we acquired Cyvera.

Morta Security, Inc.

On December 26, 2013, we completed our acquisition of Morta Security, Inc. (“Morta”), a privately-held cybersecurity company. We have accounted for this transaction as a business combination and exchanged total cash consideration of $10.3 million. Morta brings us a team of cybersecurity experts which will enhance the proven detection and prevention capabilities of our WildFire offering.

The following table summarizes our allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):



	Amount
Goodwill	$	10,127
Identified intangible assets	2,200
Net liabilities assumed	(1,982		)
Total	$	10,345

The fair values of assets acquired and liabilities assumed in the table above have been adjusted to reflect changes due to tax returns filed during the measurement period.

The following table presents details of the identified intangible assets acquired (in thousands, except years):



	Fair Value		Estimated Useful Life
In-process research and development held for defensive purposes	$	1,900	3 years
Other	300		2 years
Total	$	2,200

Morta’s operating results are included in our consolidated statements of operations from the date of the acquisition and are considered immaterial for purposes of pro forma financial disclosures. Goodwill generated from this business combination is primarily attributable to human capital with threat intelligence experience and capabilities, and is not deductible for income tax purposes.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Topic 805
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-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1500-128463

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-Topic 805
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1524-128463

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-Topic 805
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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+ Details

Goodwill and Intangible Assets

12 Months Ended

Jul. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill

The following table presents the changes in the carrying amount of goodwill during the years ended July 31, 2015 and 2014 (in thousands):



	Amount
Balance as of July 31, 2013	$	—
Goodwill acquired	155,033
Balance as of July 31, 2014	155,033
Goodwill acquired	8,120
Measurement period adjustments	369
Balance as of July 31, 2015	$	163,522

There was no impairment of goodwill during the years ended July 31, 2015 and 2014.

Purchased Intangible Assets

The following table presents details of our purchased intangible assets as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015							2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Intangible assets with finite lives:
Developed technology	$	53,100	$	(7,738	)	$	45,362	$	34,500	$	(1,643	)	$	32,857
Acquired intellectual property	8,156		(1,888		)	6,268		6,546		(958		)	5,588
In-process research and development held for defensive purposes	1,900		(1,003		)	897		1,900		(370		)	1,530
Other	500		(371		)	129		500		(120		)	380
Total intangible assets with finite lives	63,656		(11,000		)	52,656		43,446		(3,091		)	40,355
In-process research and development with indefinite lives	—		—			—		7,600		—			7,600
Total purchased intangible assets	$	63,656	$	(11,000	)	$	52,656	$	51,046	$	(3,091	)	$	47,955

We recognized amortization expense of $7.9 million, $2.9 million, and $0.1 million for the years ended July 31, 2015, 2014, and 2013, respectively. Our in-process research and development acquired from Cyvera in April 2014 was transferred to developed technology during the year ended July 31, 2015 and is being amortized over its estimated useful life of seven years.

The following table summarizes our estimated future amortization expense of intangible assets with finite lives by type as of July 31, 2015 (in thousands):



	Fiscal Years Ending July 31,
	2016		2017		2018		2019		2020		2021 and Thereafter
Developed technology	$	7,586	$	7,586	$	7,586	$	7,586	$	7,586	$	7,432
Acquired intellectual property	947		853		617		511		485		2,855
In-process research and development held for defensive purposes	633		264		—		—		—		—
Other	129		—		—		—		—		—
Total future amortization expense	$	9,295	$	8,703	$	8,203	$	8,097	$	8,071	$	10,287

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Property and Equipment

12 Months Ended

Jul. 31, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment

The following table presents details of property and equipment, net as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015			2014
Computers, equipment, and software	$	62,599		$	38,147
Leasehold improvements	25,461			21,258
Demonstration units	15,971			14,832
Furniture and fixtures	6,631			5,129
Total property and equipment	110,662			79,366
Less: accumulated depreciation	(47,784		)	(30,622		)
Total property and equipment, net	$	62,878		$	48,744

We recognized depreciation expense of $20.3 million, $14.0 million, and $9.8 million related to property and equipment during the years ended July 31, 2015, 2014, and 2013, respectively.

Convertible Senior Notes

12 Months Ended

Jul. 31, 2015

Debt Disclosure [Abstract]

Convertible Senior Notes

On June 30, 2014, we issued $575.0 million aggregate principal amount of 0.0% Convertible Senior Notes due 2019 (the “Notes”). The Notes are governed by an indenture between us, as the issuer, and U.S. Bank National Association, as Trustee (the “Indenture”). The Notes are unsecured, unsubordinated obligations that do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness, or the issuance or repurchase of securities by us or any of our subsidiaries. The Notes mature on July 1, 2019 unless converted or repurchased in accordance with their terms prior to such date. We cannot redeem the Notes prior to maturity.

The Notes are convertible for up to 5.2 million shares of our common stock at an initial conversion rate of approximately 9.068 shares of common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $110.28 per share of common stock, subject to adjustment. Holders of the Notes may surrender their Notes for conversion at their option at any time prior to the close of business on the business day immediately preceding January 1, 2019, only under the following circumstances:

•

during any fiscal quarter commencing after the fiscal quarter ending on October 31, 2014 (and only during such fiscal quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day;


•	during the five business day period after any five consecutive trading day period (the “measurement period”), in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate for the Notes on each such trading day; or


•	upon the occurrence of specified corporate events.

On or after January 1, 2019, holders may convert all or any portion of their Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. Upon conversion, holders will receive cash equal to the aggregate principal amount of the Notes to be converted, and, at our election, cash and/or shares of our common stock for any amounts in excess of the aggregate principal amount of the Notes being converted.

The conversion price will be subject to adjustment in some events. Holders of the Notes who convert their Notes in connection with certain corporate events that constitute a “make-whole fundamental change” per the Indenture are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, upon the occurrence of a corporate event that constitutes a “fundamental change” per the Indenture, holders of the Notes may require us to repurchase for cash all or a portion of the Notes at a purchase price equal to 100% of the principal amount of the Notes plus accrued and unpaid contingent interest.

In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. The difference between the principal amount of the Notes and the liability component (the “debt discount”), is amortized to interest expense using the effective interest method over the term of the Notes. The equity component of the Notes was recorded in additional paid-in capital in our consolidated balance sheets and is not remeasured as long as it continues to meet the conditions for equity classification.

In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes. Transaction costs attributable to the liability component were recorded in other assets in our consolidated balance sheets and are being amortized to interest expense in our consolidated statements of operations using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were netted with the equity component of the Notes in additional paid-in capital in our consolidated balance sheets. We recorded liability issuance costs, or debt issuance costs, of $12.5 million and equity issuance costs of $2.9 million.

During the fiscal quarter ended April 30, 2015, the last reported sale price of our common stock was greater than or equal to 130% of the conversion price of the Notes for at least 20 of the last 30 consecutive trading days of such quarter (the “stock price conversion right”). As a result, holders could convert their Notes at any time during the fiscal quarter ending July 31, 2015. Accordingly, we reclassified the net carrying amount of the Notes and related debt issuance costs to current liabilities and current assets, respectively, in our consolidated balance sheets. We also reclassified a portion of the equity component representing the conversion option to temporary equity in our consolidated balance sheets. The stock price conversion right continued to be met during the fiscal quarter ended July 31, 2015, and as a result, holders may convert their Notes at any time during the fiscal quarter ending October 31, 2015. Accordingly, a portion of the equity component remained classified in temporary equity in our consolidated balance sheets. The portion of the equity component classified as temporary equity is measured as the difference between the principal and net carrying amount of the Notes.

The following table sets forth the components of the Notes as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015			2014
Liability:
Principal	$	575,000		$	575,000
Less: debt discount, net of amortization	87,916			108,125
Net carrying amount	$	487,084		$	466,875

Equity (including temporary equity)	$	(109,785	)	$	(109,785	)

The total estimated fair value of the Notes was $994.8 million and $587.1 million at July 31, 2015 and July 31, 2014, respectively. The fair value was determined based on the closing trading price per $100 of the Notes as of the last day of trading for the period. We consider the fair value of the Notes at July 31, 2015 and July 31, 2014 to be a Level 2 measurement. The fair value of the Notes is primarily affected by the trading price of our common stock and market interest rates. As of July 31, 2015, the if-converted value of the Notes exceeded its principal amount by $376.7 million.

The following table sets forth interest expense recognized related to the Notes for the years ended July 31, 2015 and July 31, 2014 (dollars in thousands):



	Year Ended July 31,
	2015			2014
Amortization of debt issuance costs	$	2,056		$	166
Amortization of debt discount	20,209			1,660
Total interest expense recognized	$	22,265		$	1,826

Effective interest rate of the liability component	4.8		%	4.8		%

Note Hedges

To minimize the impact of potential economic dilution upon conversion of the Notes, we entered into convertible note hedge transactions (the “Note Hedges”) with respect to our common stock concurrent with the issuance of the Notes. The Note Hedges cover up to 5.2 million shares of our common stock at a strike price per share that corresponds to the initial conversion price of the Notes, which are also subject to adjustment, and are exercisable upon conversion of the Notes. The Note Hedges will expire upon maturity of the Notes. The Note Hedges are separate transactions and are not part of the terms of the Notes. Holders of the Notes will not have any rights with respect to the Note Hedges. The shares receivable related to the Note Hedges are excluded from the calculation of diluted earnings per share as they are antidilutive.

We paid an aggregate amount of $111.0 million for the Note Hedges, which is included in additional paid-in capital in our consolidated balance sheets.

Warrants

Separately, but concurrently with our issuance of the Notes, we entered into warrant transactions (the “Warrants”) whereby we sold warrants to acquire up to 5.2 million shares of our common stock at a strike price of approximately $137.85 per share, subject to adjustments. The shares issuable under the Warrants will be included in the calculation of diluted earnings per share when the average market value per share of our common stock for the reporting period exceeds the strike price of the Warrants. The Warrants are separate transactions and are not part of the Notes or Notes Hedges, and are not remeasured through earnings each reporting period. Holders of the Notes and Note Hedges will not have any rights with respect to the Warrants.

We received aggregate proceeds of $78.3 million from the sale of the Warrants, which is included in additional paid-in capital in our consolidated balance sheets.

Commitments and Contingencies

12 Months Ended

Jul. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Leases

We lease our facilities under various non-cancelable operating leases, which expire through the year ending July 31, 2028.

In September 2012, we entered into two lease agreements for an aggregate of approximately 300,000 square feet of space in Santa Clara, California to serve as our corporate headquarters beginning in November 2013. The leases commenced in November 2012 and August 2013, expire in July 2023, and allow for two separate 5-year options to extend the lease term. Payments under these leases are approximately $94.3 million over the lease term. Each lease has a rent holiday, which was included in the determination of rent expense.

In July 2013, we entered into a 51-month sub-lease agreement for our previous corporate headquarters with a commencement date of January 2014. Net proceeds from this sub-lease are approximately $10.7 million over the lease term. The sub-lease agreement contains a rent credit of $0.5 million, which was included in the determination of rental income.

In May 2015, we entered into three lease agreements for approximately 752,000 square feet of corporate office space in Santa Clara, California to serve as our future corporate headquarters. The first lease will commence in May 2016 and expire in April 2021, although it can also be terminated by us under certain conditions. The remaining two leases will commence in May 2017 and expire in April 2028, however, the property is currently under construction and as a result, the lease commencement dates may change based on progress of the construction project. The leases contain a rent holiday period, scheduled rent increases, lease incentives, and renewal options which allow the lease terms to be extended through April 2046. Rental payments under the three lease agreements are approximately $275.1 million over the lease term. In August 2015, we executed the expansion notice under the lease agreements to notify the landlord of our intent to lease approximately 300,000 square feet of additional space in a building that will be constructed at a future date. The lease related to this additional space has not yet been executed.

We recognized rent expense of $15.4 million, $13.2 million, and $4.4 million for the years ended July 31, 2015, 2014, and 2013, respectively. Rent expense is recognized on a straight-line basis over the term of the lease.

The following table presents details of the aggregate future non-cancelable minimum rental payments under our operating leases as of July 31, 2015 (in thousands):



	Amount
Years ending July 31:
2016	$	20,821
2017	24,374
2018	27,133
2019	41,583
2020	42,043
2021 and thereafter	253,202
Committed gross lease payments	409,156
Less: proceeds from sublease rental	8,174
Net operating lease obligation	$	400,982

Contract Manufacturer Commitments

Our independent contract manufacturer procures components and assembles our products based on our forecasts. These forecasts are based on estimates of demand for our products primarily for the next twelve months, which are in turn based on historical trends and an analysis from our sales and product marketing organizations, adjusted for overall market conditions. In order to reduce manufacturing lead times and plan for adequate supply, we may issue forecasts and orders for components and products that are non-cancelable. Obligations under contracts that we can cancel without a significant penalty are not included. As of July 31, 2015, we had $42.8 million of open orders.

Litigation

In December 2011, Juniper Networks, Inc. (“Juniper”) filed a complaint against us in the United States District Court for the District of Delaware alleging patent infringement, which sought preliminary and permanent injunctions against infringement, treble damages, and attorneys’ fees. On September 30, 2013, we filed a lawsuit against Juniper in the United States District Court for the Northern District of California alleging that Juniper’s products infringe three of our U.S. patents, and sought monetary damages and a permanent injunction. On May 27, 2014, we entered into a Settlement, Release and Cross-License Agreement (the “Settlement Agreement”) with Juniper to resolve all pending litigation between the parties, including those discussed above. Refer to Note 9. Legal Settlement for more information on the Settlement Agreement.

In addition to the above matter, we are subject to legal proceedings, claims, and litigation arising in the ordinary course of business, including intellectual property litigation. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. We accrue for contingencies when we believe that a loss is probable and that we can reasonably estimate the amount of any such loss.

To the extent there is a reasonable possibility that a loss exceeding amounts already recognized may be incurred and the amount of such additional loss would be material, we will either disclose the estimated additional loss or state that such an estimate cannot be made. As of July 31, 2015, we have not recorded any significant accruals for loss contingencies associated with such legal proceedings, determined that an unfavorable outcome is probable or reasonably possible, or determined that the amount or range of any possible loss is reasonably estimable.

Indemnification

Under the indemnification provisions of our standard sales related contracts, we agree to defend our end-customers against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. Our exposure under these indemnification provisions is generally limited to the total amount paid by our end-customer under the agreement. However, certain agreements include indemnification provisions that could potentially expose us to losses in excess of the amount received under the agreement. In addition, we indemnify our officers, directors, and certain key employees while they are serving in good faith in their company capacities. To date, there have been no claims under any indemnification provisions.

Legal Settlement

12 Months Ended

Jul. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Legal Settlement

Settlement, Release and Cross-License Agreement with Juniper

On May 27, 2014, we entered into the Settlement Agreement with Juniper, whereby we resolved all pending litigation matters. Under the terms of the Settlement Agreement, we agreed to pay Juniper a one-time settlement amount comprised of $75.0 million in cash, 1.1 million shares of our common stock, and a warrant to purchase 0.5 million shares of our common stock, in exchange for the following:


•	Mutual dismissal with prejudice of all pending litigation between the parties and general release of all liability for Palo Alto Networks and Juniper,


•	Cross-license between both parties for the patents-in-suit and associated family members and counterparts worldwide for the life of the patents, and


•	Mutual covenant not to sue for infringement of any other patents for a period of eight years.

The fair value of the total consideration as of the settlement date was $182.5 million, which was comprised of $75.0 million in cash, $75.2 million in common stock, and $32.2 million in warrant. The fair values of the common stock and warrant were measured using the closing price of our common stock on the settlement date.

The warrant was issued on June 3, 2014 and entitled Juniper to purchase up to 0.5 million shares of common stock at an exercise price of $0.0001 per share and was classified as a liability during the period it was outstanding. On July 1, 2014, Juniper exercised the warrant in full. Accordingly, we recorded the change in the fair value of the warrant liability through the exercise date of $5.9 million within other income (expense), net in our consolidated statement of operations for the year ended July 31, 2014.

We accounted for the Settlement Agreement as a multiple-element arrangement and allocated the fair value of the consideration as of the settlement date to the identifiable elements based on their estimated fair values. Of the total settlement amount, $61.3 million was allocated to the licensing of intellectual property, $54.3 million was allocated to the mutual dismissal of claims, and the remaining amount was allocated to the mutual covenant not to sue. The mutual dismissal of claims and the mutual covenant not to sue have no identifiable future benefit, and as a result we recorded a settlement charge within legal settlement expense in our consolidated statement of operations for the year ended July 31, 2014. The licensing of intellectual property is being amortized to cost of product revenue in our consolidated statements of operations over the estimated period of benefit of five years.

Mutual Covenant Not to Sue and Release Agreement

On January 27, 2014, we executed a Mutual Covenant Not to Sue and Release Agreement with Fortinet, Inc., thereby extending an existing covenant for six more years. We evaluated the transaction as a multiple-element arrangement and allocated the one-time payment that we made in the amount of $20.0 million to each identifiable element using its relative fair value. Based on our estimates of fair value, we determined that the primary benefit of the arrangement is avoided litigation cost and the release of any potential past claims, with no material value attributable to future use or benefit. Accordingly, we recorded a $20.0 million settlement charge within legal settlement expense in our consolidated statement of operations for the year ended July 31, 2014.

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Jul. 31, 2015
Stockholders' Equity Note [Abstract]
Stockholders’ Equity	Stockholders’ Equity In October 2012, we completed our secondary offering whereby certain stockholders of our company sold 4.8 million shares of common stock to the public at a price of $63.00 per share. The aggregate offering price for shares sold in the offering was approximately $290.3 million, net of underwriting discounts and commissions. We did not receive any proceeds from the sale of shares in this offering. Offering expenses were paid by the stockholders who sold shares of common stock in the offering.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.4-08.(d),(e))
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

Equity Award Plans

12 Months Ended

Jul. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity Award Plans

Share-Based Compensation Plans

2012 Equity Incentive Plan

Our 2012 Equity Incentive Plan (our “2012 Plan”) was adopted by our board of directors and approved by the stockholders on June 5, 2012 and was effective one business day prior to the effectiveness of our registration statement for our initial public offering (IPO). Our 2012 Plan replaced our 2005 Equity Incentive Plan (our “2005 Plan”), which terminated upon the completion of our IPO, however, awards that were outstanding upon termination remained outstanding pursuant to their original terms. Our 2012 Plan provides for the granting of stock options, restricted stock awards, restricted stock units (RSUs), stock appreciation rights, performance units, and performance shares to our employees, directors, and consultants.

Awards granted under our 2012 Plan vest over the periods determined by the board of directors, generally three to four years, and expire no more than ten years after the date of grant. In the case of an incentive stock option granted to an employee, who at the time of grant owns stock representing more than 10% of the total combined voting power of all classes of stock, the exercise price shall be no less than 110% of the fair value per share on the date of grant, and expire five years from the date of grant, and for options granted to any other employee, the per share exercise price shall be no less than 100% of the fair value per share on the date of grant. In the case of a non-statutory stock option and options granted to consultants, the per share exercise price shall be no less than 100% of the fair value per share on the date of grant. Stock that is purchased prior to vesting is subject to our right of repurchase at any time following termination of the participant. Since our IPO in 2012, awards granted under our 2012 Plan consist primarily of RSUs, which generally vest over a period of three to four years from the date of grant. Until vested, RSUs do not have the voting and dividend participation rights of common stock and the shares underlying the awards are not considered issued and outstanding.

A total of 18.5 million shares of our common stock are reserved for issuance pursuant to our 2012 Plan as of July 31, 2015. This includes shares that are (i) reserved but unissued under our 2005 Plan on the effective date of our 2012 Plan or (ii) returned to our 2005 Plan as a result of expiration or termination of options. On the first day of each fiscal year, the number of shares in the reserve may be increased by the lesser of (i) 8,000,000 shares, (ii) 4.5% of the outstanding shares of common stock on the last day of our immediately preceding fiscal year, or (iii) such other amount as determined by our board of directors.

2012 Employee Stock Purchase Plan

Our 2012 Employee Stock Purchase Plan (our “2012 ESPP”) was adopted by our board of directors and approved by the stockholders on June 5, 2012 and was effective upon completion of our IPO.

Our 2012 ESPP permits eligible employees to acquire shares of our common stock at 85% of the lower of the fair market value of our common stock on the first trading day of each offering period or on the exercise date. Each offering period will be approximately six months starting on the first trading date on or after March 15 and September 15 of each year. Participants may purchase shares of common stock through payroll deductions of up to 15% of their eligible compensation, subject to purchase limits of 625 shares during a six month period or $25,000 worth of stock for each calendar year.

A total of 1.8 million shares of our common stock are available for sale under our 2012 ESPP as of July 31, 2015. On the first day of each fiscal year, the number of shares in the reserve may be increased by the lesser of (i) 2,000,000 shares, (ii) 1% of the outstanding shares of our common stock on the first day of the fiscal year, or (iii) such other amount as determined by our board of directors.

Stock Option Activities

A summary of the activity under our stock plans during the reporting period and a summary of information related to options exercisable, vested, and expected to vest are presented below (in thousands, except per share amounts):



	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2014	5,830		$	13.02	7.0	$	395,507
Options granted	—		—
Options forfeited	(54	)	17.43
Options exercised	(2,505	)	11.99
Balance—July 31, 2015	3,271		$	13.74	6.2	$	562,906
Options vested and expected to vest—July 31, 2015	3,254		$	13.70	6.1	$	560,111
Options exercisable—July 31, 2015	2,578		$	12.13	6.1	$	447,799

The weighted-average grant-date fair value of options granted during the year ended July 31, 2013 was $26.09. The intrinsic value of options exercised during the years ended July 31, 2015, 2014, and 2013 was $301.1 million, $198.8 million, and $186.8 million, respectively. The grant-date fair value of options vested during the years ended July 31, 2015, 2014, and 2013 was $14.6 million, $17.1 million, and $21.4 million, respectively.

RSU Activities

A summary of the activity under our stock plans during the reporting period and a summary of information related to RSUs vested and expected to vest are presented below (in thousands, except per share amounts):



	RSUs Outstanding
	Number of Shares		Weighted- Average Grant-Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2014	6,046		$	59.84	1.4	$	488,880
RSUs granted	4,142		122.36
RSUs vested	(2,511	)	58.40
RSUs forfeited	(494	)	70.55
Balance—July 31, 2015	7,183		$	95.66	1.2	$	1,334,817
RSUs vested and expected to vest—July 31, 2015	6,582		$	94.90	1.2	$	1,223,133

The weighted-average grant-date fair value of RSUs granted during the years ended July 31, 2015, 2014, and 2013 was $122.36, $61.00, and $54.51, respectively. The aggregate fair value, as of the respective vesting dates, of RSUs vested during the years ended July 31, 2015, 2014, and 2013 was $350.4 million, $57.4 million, and $0.3 million, respectively.

Shares Available for Grant

The following table presents the stock activity and the total number of shares available for grant as of July 31, 2015 (in thousands):



	Number of shares
Balance—July 31, 2014	8,066
Authorized	3,578
RSUs granted	(4,142	)
Repurchased	—
Options forfeited	54
RSUs forfeited	494
Balance—July 31, 2015	8,050

Employee Stock Purchase Plan

We recognized compensation expense of $6.7 million, $4.5 million, and $5.3 million in connection with our 2012 ESPP during the years ended July 31, 2015, 2014, and 2013, respectively. Employees purchased 0.2 million shares of common stock at an average exercise price of $75.09 per share during the year ended July 31, 2015.

Share-Based Compensation

We record share-based compensation awards based on fair value as of the grant date. For option awards and ESPP offerings we use the Black-Scholes option-pricing model to determine fair value. We recognize such costs as compensation expense on a straight-line basis over the requisite service period of the award. The assumptions for our option-pricing model are determined as follows:

Risk-Free Interest Rate

We base the risk-free interest rate used in the Black-Scholes valuation model on the implied yield available on U.S. Treasury zero-coupon issues with an equivalent remaining term of the options for each option group or the term of our 2012 ESPP offering.

Expected Term

The expected term represents the period that our share-based awards are expected to be outstanding. We determined the expected term assumption based on the contractual term of the options adjusted for estimates of our employees' expected exercise and expected post-vesting termination behavior. For our 2012 ESPP, the expected term is based on the length of the offering period.

Volatility

Beginning in fiscal 2014, we determine the price volatility factor based on the historical volatility of our common stock. Prior to fiscal 2014, we determined the price volatility factor based on the historical volatilities of our peer group as we did not have sufficient trading history for our common stock.

Dividend Yield

The expected dividend assumption is based on our current expectations about our anticipated dividend policy.

The following table summarizes the assumptions related to our stock options:



	Year Ended July 31, 2013
Risk-free interest rate	1.0%
Expected term	6 years
Volatility	50%
Dividend yield	—%

The following table summarizes the assumptions related to our 2012 ESPP:



	Year Ended July 31,
	2015	2014	2013
Risk-free interest rate	0.1%	0.1%	0.1%
Expected term	< 1 year	< 1 year	< 1 year
Volatility	40%	40%	42%
Dividend yield	—%	—%	—%

The following table summarizes share-based compensation included in costs and expenses (in thousands):



	Year Ended July 31,
	2015		2014		2013
Cost of product revenue	$	3,858	$	1,636	$	765
Cost of services revenue	20,425		9,434		3,586
Research and development	74,837		29,524		9,931
Sales and marketing	84,113		42,647		20,493
General and administrative	38,198		16,668		9,101
Total share-based compensation	$	221,431	$	99,909	$	43,876

At July 31, 2015, total compensation cost related to unvested share-based awards granted but not yet recognized was $557.0 million, net of estimated forfeitures. This cost is expected to be amortized on a straight-line basis over a weighted-average period of three years. Future grants will increase the amount of compensation expense to be recorded in these periods.

For the year ended July 31, 2014, we accelerated the vesting of certain share-based awards in connection with our acquisitions of Morta and Cyvera and as a result, we recorded $3.4 million of compensation expense within general and administrative expense. For the year ended July 31, 2013, we modified the terms of certain share-based awards for a former employee and as a result, we recorded $1.9 million of compensation expense within sales and marketing expense.

Income Taxes

12 Months Ended

Jul. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

The following table presents the components of income (loss) before income taxes (in thousands):



	Year Ended July 31,
	2015			2014			2013
United States	$	(47,493	)	$	(149,243	)	$	5,198
Foreign	(108,084		)	(72,917		)	(23,854		)
Total	$	(155,577	)	$	(222,160	)	$	(18,656	)

The following table summarizes the provision for income taxes (in thousands):



	Year Ended July 31,
	2015			2014			2013
Federal:
Current	$	1,757		$	795		$	5,883
Deferred	(2,972		)	—			—
State:
Current	682			230			1,758
Deferred	(431		)	(324		)	—
Foreign:
Current	10,738			4,679			3,296
Deferred	(369		)	(1,088		)	(347		)
Total	$	9,405		$	4,292		$	10,590

The following table presents the items accounting for the difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes:



	Year Ended July 31,
	2015		2014		2013
Federal statutory rate	35.0	%	35.0	%	35.0	%
Effect of:
State taxes, net of federal tax benefit	3.6		1.3		1.0
Foreign income at other than U.S. rates	(6.5	)	(12.1	)	(62.4	)
Change in valuation allowance	(28.5	)	(21.3	)	(32.5	)
Share-based compensation	(10.2	)	(3.2	)	(16.1	)
Meals and entertainment	(0.6	)	(0.3	)	(2.0	)
Amortization of deferred tax charges	(2.2	)	—		—
Research credits	6.7		1.3		25.2
Other, net	(3.3	)	(2.6	)	(5.0	)
Total	(6.0	)%	(1.9	)%	(56.8	)%

During the year ended July 31, 2015, we completed several changes to our corporate structure to more closely align with the global nature of our business. As a result, we recorded deferred tax charges in prepaid expenses and other current assets and other assets on our consolidated balance sheets. These amounts are being amortized on a straight-line basis over the life of the associated assets as a component of provision for income taxes in our consolidated statements of operations.

The following table presents the components of our deferred tax assets and liabilities as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015			2014
Deferred tax assets:
Accruals and reserves	$	38,936		$	7,942
Deferred revenue	35,261			30,430
Research and development and foreign tax credits	20,123			8,741
Net operating loss carryforwards	18,376			32,282
Share-based compensation	35,893			17,715
Gross deferred tax assets	148,589			97,110
Valuation allowance	(138,354		)	(89,309		)
Total deferred tax assets	10,235			7,801
Deferred tax liabilities:
Fixed assets and intangible assets	(7,919		)	(15,040		)
Other deferred tax liabilities	(1,631		)	(565		)
Total deferred tax liabilities	(9,550		)	(15,605		)
Total	$	685		$	(7,804	)

A valuation allowance is provided when it is more likely than not that the deferred tax asset will not be realized. Realization of deferred tax assets is dependent upon future taxable income, if any, the amount and timing of which are uncertain. At such time, if it is determined that it is more likely than not that the deferred tax assets are realizable, the valuation allowance will be adjusted. As of July 31, 2015, we have provided a valuation allowance for our federal, state, and certain foreign deferred tax assets that we believe will, more likely than not, be unrealizable. The net valuation allowance increased by approximately $49.0 million from the year ended July 31, 2014 to the year ended July 31, 2015, which was primarily attributable to an increase in deferred tax assets in our federal and state jurisdictions.

Due to our acquisition of CirroSecure, a deferred tax liability was established for the book-tax basis difference related to purchased intangibles. The net deferred tax liability from acquisitions provided an additional source of income to support the realizability of our pre-existing deferred tax assets and as a result, we released a portion of the valuation allowance that was established in the previous year and recorded a tax benefit of $3.4 million for the year ended July 31, 2015.

As of July 31, 2015, we had federal, state, and foreign NOL carryforwards of approximately $752.9 million, $808.5 million, and $12.5 million, respectively as reported on our tax returns, available to reduce future taxable income, if any. If not utilized, our federal and state NOL carryforwards will expire in various amounts from the years ending July 31, 2027 through 2035 and July 31, 2017 through 2035, respectively. Our foreign NOL will carry forward indefinitely.

As of July 31, 2015, we had federal and state research and development tax credit carryforwards of approximately $17.2 million and $21.8 million, respectively as reported on our tax returns. If not utilized, the federal credit carryforwards will expire in various amounts from the years ending July 31, 2026 through 2035. The state credit will carry forward indefinitely.

As of July 31, 2015, we had foreign tax credit carryforwards of $1.1 million as reported on our tax returns. If not utilized, the foreign tax credit carryforwards will expire in various amounts from the years ending July 31, 2021 through 2025.

Utilization of the NOL carryforwards and credits may be subject to a substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of NOLs and credits before utilization.

We use the with-and-without approach to determine the recognition and measurement of excess tax benefits resulting from share-based awards. Accordingly, we have elected to recognize excess income tax benefits from share-based awards in additional paid-in capital only if an incremental income tax benefit would be realized after considering all other tax attributes presently available to us. As of July 31, 2015, we had excess tax benefits from share-based awards of $680.7 million, $648.2 million, and $12.5 million included in federal, state, and foreign NOL, respectively. We also had $5.3 million of excess tax benefits from share-based awards included in federal research and development tax credit. The impact of this excess tax benefit is recognized as additional paid-in capital when it reduces taxes payable. We have elected to account for the indirect effects of share-based awards on other tax attributes, such as the research, foreign and other tax credits, through the consolidated statements of operations.

During the years ended July 31, 2015, 2014, and 2013, we recorded excess tax benefits that resulted from allocating certain tax effects related to exercises of stock options and vesting of RSUs directly to stockholders’ equity in the amount of $2.5 million, $1.0 million, and $6.8 million, respectively.

In December 2014, the Tax Increase Prevention Act of 2014 was signed into law, which retroactively extends the federal research and development credit, bonus depreciation, and other corporate tax incentives through December 31, 2014. Due to the valuation allowance against our domestic deferred tax assets, we did not recognize any discrete tax benefits during the year ended July 31, 2015 as a result of the legislation.

As of July 31, 2015, we had $67.2 million of unrecognized tax benefits, $10.8 million of which would affect income tax expense if recognized, after consideration of our valuation allowance in the United States and other assets. As of July 31, 2014, we had $10.4 million of unrecognized tax benefits, $3.9 million of which would affect income tax expense if recognized, after consideration of our valuation allowance in the United States. As of July 31, 2015, our federal, state, and foreign returns for the tax years 2008 through the current period remain open to examination. Fiscal years outside the normal statute of limitation remain open to audit by tax authorities due to tax attributes generated in earlier years, which have been carried forward and may be audited in subsequent years when utilized. We do not expect the amount of unrecognized tax benefits as of July 31, 2015 to change significantly over the next 12 months. We recognize both interest and penalties associated with uncertain tax positions as a component of income tax expense. During the years ended July 31, 2015, 2014, and 2013, we recognized income tax expense related to interest and penalties of $1.1 million, $0.3 million, and $0.2 million, respectively. We had accrued interest and penalties on our consolidated balance sheets related to unrecognized tax benefits of $1.8 million and $0.6 million as of July 31, 2015 and 2014, respectively. The ultimate amount and timing of any future cash settlements cannot be predicted with reasonable certainty.

The following table presents a reconciliation of the beginning and ending amount of our gross unrecognized tax benefits (in thousands):



	Year Ended July 31,
	2015			2014		2013
Unrecognized tax benefits at the beginning of the period	$	10,385		$	6,561	$	2,630
Additions for tax positions taken in prior years	6,061			428		585
Reductions for tax positions taken in prior years	(612		)	—		(3		)
Additions for tax positions taken in the current year	51,324			3,396		3,349
Unrecognized tax benefits at the end of the period	$	67,158		$	10,385	$	6,561

As of July 31, 2015, we had approximately $7.0 million of undistributed earnings in foreign subsidiaries. We expect to permanently reinvest these earnings outside of the United States to fund future foreign operations. We project that we will have sufficient cash flow in the United States and will not need to repatriate the foreign earnings to finance our domestic operations. If we were to distribute these earnings to the United States, we would be subject to U.S. income taxes, an adjustment for foreign tax credits, and foreign withholding taxes. We have not recorded a deferred tax liability on any portion of our undistributed earnings in foreign subsidiaries. If we were to repatriate these earnings to the United States, any associated income tax liability would be insignificant.

Net Income (Loss) Per Share

12 Months Ended

Jul. 31, 2015

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) by basic weighted-average shares outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) by diluted weighted-average shares outstanding, including potentially dilutive securities.

The following table presents the computation of basic and diluted net loss per share of common stock (in thousands, except per share data):



	Year Ended July 31,
	2015			2014			2013
Net loss	$	(164,982	)	$	(226,452	)	$	(29,246	)
Weighted-average shares used to compute net loss per share, basic and diluted	81,619			74,291			68,682
Net loss per share, basic and diluted	$	(2.02	)	$	(3.05	)	$	(0.43	)

The following securities were excluded from the computation of diluted net loss per share of common stock for the periods presented as their effect would have been antidilutive (in thousands):



	Year Ended July 31,
	2015	2014	2013
Options	3,271	5,830	10,033
RSUs	7,183	6,046	2,241
ESPP shares	78	95	114
Convertible senior notes	5,214	5,214	—
Warrants related to the issuance of convertible senior notes	5,214	5,214	—
Total	20,960	22,399	12,388

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Jul. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plan	Employee Benefit Plan We have established a 401(k) tax-deferred savings plan which permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. We are responsible for administrative costs of the plan and have made no contributions to the plan since inception.

Segment Information

12 Months Ended

Jul. 31, 2015

Segment Reporting [Abstract]

Segment Information

We conduct business globally and are primarily managed on a geographic theater basis. Our chief operating decision maker reviews financial information presented on a consolidated basis accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. We have one business activity and there are no segment managers who are held accountable for operations, operating results, and plans for levels, components, or types of products or services below the consolidated unit level. Accordingly, we are considered to be in a single reportable segment and operating unit structure.

The following table presents revenue by geographic theater (in thousands):



	Year Ended July 31,
	2015		2014		2013
Revenue:
Americas
United States	$	593,741	$	363,174	$	228,604
Other Americas	45,587		33,452		19,012
Total Americas	639,328		396,626		247,616
EMEA	178,719		126,915		91,496
APAC	110,005		74,638		56,995
Total revenue	$	928,052	$	598,179	$	396,107

The following table presents revenue for groups of similar products and services (in thousands):



	Year Ended July 31,
	2015		2014		2013
Revenue:
Product	$	492,658	$	340,143	$	243,707
Services
Subscription	212,676		123,236		71,203
Support and maintenance	222,718		134,800		81,197
Total services	435,394		258,036		152,400
Total revenue	$	928,052	$	598,179	$	396,107

Substantially all of our assets were attributable to the Americas operations as of July 31, 2015 and 2014.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Jul. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

The following tables set forth selected unaudited financial data for the years ended July 31, 2015 and 2014 (in thousands, except per share amounts):



	Three Months Ended
	Oct. 31, 2014			Jan. 31, 2015			Apr. 30, 2015			Jul. 31, 2015
Revenue:
Product	$	101,476		$	115,621		$	121,524		$	154,037
Services	90,870			102,034			112,648			129,842
Total revenue	192,346			217,655			234,172			283,879
Cost of revenue:
Product	29,141			30,640			32,851			38,462
Services	24,320			28,685			31,544			35,856
Total cost of revenue	53,461			59,325			64,395			74,318
Total gross profit	138,885			158,330			169,777			209,561
Operating expenses:
Research and development	37,305			46,948			48,486			53,089
Sales and marketing	106,366			122,875			131,026			162,429
General and administrative	18,977			27,023			26,989			28,576
Total operating expenses	162,648			196,846			206,501			244,094
Operating loss	(23,763		)	(38,516		)	(36,724		)	(34,533		)
Interest expense	(5,489		)	(5,539		)	(5,631		)	(5,666		)
Other income (expense), net	341			344			(55		)	(346		)
Loss before income taxes	(28,911		)	(43,711		)	(42,410		)	(40,545		)
Provision for (benefit from) income taxes	1,157			(703		)	3,525			5,426
Net loss	$	(30,068	)	$	(43,008	)	$	(45,935	)	$	(45,971	)
Net loss per share, basic and diluted	$	(0.38	)	$	(0.53	)	$	(0.56	)	$	(0.55	)



	Three Months Ended
	Oct. 31, 2013			Jan. 31, 2014			Apr. 30, 2014			Jul. 31, 2014
Revenue:
Product	$	75,485		$	80,823		$	84,128		$	99,707
Services	52,695			60,245			66,572			78,524
Total revenue	128,180			141,068			150,700			178,231
Cost of revenue:
Product	17,954			20,221			20,425			26,903
Services	15,853			17,283			19,285			21,704
Total cost of revenue	33,807			37,504			39,710			48,607
Total gross profit	94,373			103,564			110,990			129,624
Operating expenses:
Research and development	19,893			24,253			27,837			32,830
Sales and marketing	67,366			76,734			83,995			106,668
General and administrative	14,125			19,733			23,717			15,574
Legal settlement (Note 9)	—			20,000			121,173			—
Total operating expenses	101,384			140,720			256,722			155,072
Operating loss	(7,011		)	(37,156		)	(145,732		)	(25,448		)
Interest expense	(8		)	(14		)	(13		)	(1,848		)
Other income (expense), net	405			(170		)	430			(5,595		)
Loss before income taxes	(6,614		)	(37,340		)	(145,315		)	(32,891		)
Provision for (benefit from) income taxes	1,247			2,606			1,272			(833		)
Net loss	$	(7,861	)	$	(39,946	)	$	(146,587	)	$	(32,058	)
Net loss per share, basic and diluted	$	(0.11	)	$	(0.55	)	$	(1.96	)	$	(0.41	)

Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Jul. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Principles of Consolidation

The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates

Comprehensive Loss

Foreign Currency Transactions

Cash and Cash Equivalents

Fair Value

Investments

Accounts Receivable

Property and Equipment

Business Combinations

Amortization of Intangible Assets

Impairment of Goodwill, Intangible Assets, and Long-Lived Assets

Contract Manufacturer Liabilities

Convertible Senior Notes

Revenue Recognition

Revenue is recognized when all of the following criteria are met:


•	Persuasive Evidence of an Arrangement Exists. We rely upon non-cancelable sales agreements and purchase orders to determine the existence of an arrangement.


•	Delivery has Occurred. We use shipping documents or transmissions of product or service contract registration codes to determine delivery.


•	The Fee is Fixed or Determinable. We assess whether the fee is fixed or determinable based on the payment terms associated with the transaction.


•	Collectability is Reasonably Assured. We assess collectability based on credit analysis and payment history.

Advertising Costs

Advertising costs, which are expensed and included in sales and marketing expense when incurred

Software Development Costs

Share-Based Compensation

Leases

Income Taxes

Loss Contingencies

Recent Accounting Pronouncements

Fair Value Measurements


•	Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.


•	Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.


•	Level 3—Inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.

Fair Value Measurements (Tables)

12 Months Ended

Jul. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of fair value of financial assets and liabilities

The following table presents the fair value of our financial assets and liabilities using the above input categories as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31, 2015								July 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Short-term investments:
Certificates of deposit	$	—	$	1,000	$	—	$	1,000	$	—	$	—	$	—	$	—
Corporate debt securities	—		97,825		—		97,825		—		22,239		—		22,239
U.S. government and agency securities	—		314,340		—		314,340		—		96,451		—		96,451
Total short-term investments	—		413,165		—		413,165		—		118,690		—		118,690
Long-term investments:
Certificates of deposit	—		—		—		—		—		1,000		—		1,000
Corporate debt securities	—		92,902		—		92,902		—		39,018		—		39,018
U.S. government and agency securities	—		445,939		—		445,939		—		161,862		—		161,862
Total long-term investments	—		538,841		—		538,841		—		201,880		—		201,880
Other assets:
Certificates of deposit	—		—		—		—		1,220		—		—		1,220
Total other assets	—		—		—		—		1,220		—		—		1,220
Total assets measured at fair value	$	—	$	952,006	$	—	$	952,006	$	1,220	$	320,570	$	—	$	321,790

Investments (Tables)

12 Months Ended

Jul. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale investments

The following tables summarize the unrealized gains and losses and fair value of our investments as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1,000	$	—	$	—		$	1,000
Corporate debt securities	190,882		24		(179		)	190,727
U.S. government and agency securities	760,212		271		(204		)	760,279
Total	$	952,094	$	295	$	(383	)	$	952,006



	July 31, 2014
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1,000	$	—	$	—		$	1,000
Corporate debt securities	61,299		16		(58		)	61,257
U.S. government and agency securities	258,376		45		(108		)	258,313
Total	$	320,675	$	61	$	(166	)	$	320,570

Schedule of available-for-sale investments in unrealized loss position

The following tables present our investments that were in an unrealized loss position as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31, 2015
	Less Than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	134,976	$	(179	)	$	—	$	—	$	134,976	$	(179	)
U.S. government and agency securities	348,991		(204		)	—		—		348,991		(204		)
Total	$	483,967	$	(383	)	$	—	$	—	$	483,967	$	(383	)



	July 31, 2014
	Less Than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	43,868	$	(58	)	$	—	$	—	$	43,868	$	(58	)
U.S. government and agency securities	142,490		(108		)	—		—		142,490		(108		)
Total	$	186,358	$	(166	)	$	—	$	—	$	186,358	$	(166	)

Contractual maturities of available-for-sale investments

The following table summarizes the amortized cost and fair value of our investments as of July 31, 2015, by contractual years-to-maturity (in thousands):



	Amortized Cost		Fair Value
Due within one year	$	413,148	$	413,165
Due between one and three years	538,946		538,841
Total	$	952,094	$	952,006

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Acquisitions (Tables)

12 Months Ended

Jul. 31, 2015

Cyvera, Ltd.

Business Acquisition

Schedule of consideration

We have accounted for this transaction as a business combination in exchange for total consideration of approximately $177.6 million, which consisted of the following (in thousands):



	Amount
Cash	$	90,170
Common stock (1.3 million shares)	87,477
Total	$	177,647

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes our allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):



	Amount
Cash	$	6,930
Goodwill	145,275
Identified intangible assets	42,300
Accrued and other liabilities, net	(6,950		)
Long-term deferred tax liability, net	(9,908		)
Total	$	177,647

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination

The following table presents details of the identified intangible assets acquired as of the date of acquisition (in thousands, except years):



	Fair Value		Estimated Useful Life
Developed technology	$	34,500	7 years
In-process research and development	7,600		N/A
Other	200		2 years
Total	$	42,300

Business Acquisition, Pro Forma Information

The following table presents the unaudited pro forma financial information for the years ended July 31, 2014 and 2013, as though the companies were combined as of August 1, 2012 (in thousands):



	Year Ended July 31,
	2014			2013
Total revenue	$	598,254		$	396,131
Net loss	$	(241,920	)	$	(43,041	)

Morta Security, Inc.

Business Acquisition

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes our allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):



	Amount
Goodwill	$	10,127
Identified intangible assets	2,200
Net liabilities assumed	(1,982		)
Total	$	10,345

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination

The following table presents details of the identified intangible assets acquired (in thousands, except years):



	Fair Value		Estimated Useful Life
In-process research and development held for defensive purposes	$	1,900	3 years
Other	300		2 years
Total	$	2,200

Goodwill and Intangible Assets (Tables)

12 Months Ended

Jul. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents the changes in the carrying amount of goodwill during the years ended July 31, 2015 and 2014 (in thousands):



	Amount
Balance as of July 31, 2013	$	—
Goodwill acquired	155,033
Balance as of July 31, 2014	155,033
Goodwill acquired	8,120
Measurement period adjustments	369
Balance as of July 31, 2015	$	163,522

Schedule of Intangible Assets

The following table presents details of our purchased intangible assets as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015							2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Intangible assets with finite lives:
Developed technology	$	53,100	$	(7,738	)	$	45,362	$	34,500	$	(1,643	)	$	32,857
Acquired intellectual property	8,156		(1,888		)	6,268		6,546		(958		)	5,588
In-process research and development held for defensive purposes	1,900		(1,003		)	897		1,900		(370		)	1,530
Other	500		(371		)	129		500		(120		)	380
Total intangible assets with finite lives	63,656		(11,000		)	52,656		43,446		(3,091		)	40,355
In-process research and development with indefinite lives	—		—			—		7,600		—			7,600
Total purchased intangible assets	$	63,656	$	(11,000	)	$	52,656	$	51,046	$	(3,091	)	$	47,955

Future Amortization Expense of Intangible Assets

The following table summarizes our estimated future amortization expense of intangible assets with finite lives by type as of July 31, 2015 (in thousands):



	Fiscal Years Ending July 31,
	2016		2017		2018		2019		2020		2021 and Thereafter
Developed technology	$	7,586	$	7,586	$	7,586	$	7,586	$	7,586	$	7,432
Acquired intellectual property	947		853		617		511		485		2,855
In-process research and development held for defensive purposes	633		264		—		—		—		—
Other	129		—		—		—		—		—
Total future amortization expense	$	9,295	$	8,703	$	8,203	$	8,097	$	8,071	$	10,287

Property and Equipment (Tables)

12 Months Ended

Jul. 31, 2015

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

The following table presents details of property and equipment, net as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015			2014
Computers, equipment, and software	$	62,599		$	38,147
Leasehold improvements	25,461			21,258
Demonstration units	15,971			14,832
Furniture and fixtures	6,631			5,129
Total property and equipment	110,662			79,366
Less: accumulated depreciation	(47,784		)	(30,622		)
Total property and equipment, net	$	62,878		$	48,744

Convertible Senior Notes (Tables)

12 Months Ended

Jul. 31, 2015

Debt Disclosure [Abstract]

Components of Convertible Senior Notes

The following table sets forth the components of the Notes as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015			2014
Liability:
Principal	$	575,000		$	575,000
Less: debt discount, net of amortization	87,916			108,125
Net carrying amount	$	487,084		$	466,875

Equity (including temporary equity)	$	(109,785	)	$	(109,785	)

Interest Expense Recognized related to the Notes

The following table sets forth interest expense recognized related to the Notes for the years ended July 31, 2015 and July 31, 2014 (dollars in thousands):



	Year Ended July 31,
	2015			2014
Amortization of debt issuance costs	$	2,056		$	166
Amortization of debt discount	20,209			1,660
Total interest expense recognized	$	22,265		$	1,826

Effective interest rate of the liability component	4.8		%	4.8		%

Commitments and Contingencies (Tables)

12 Months Ended

Jul. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The following table presents details of the aggregate future non-cancelable minimum rental payments under our operating leases as of July 31, 2015 (in thousands):



	Amount
Years ending July 31:
2016	$	20,821
2017	24,374
2018	27,133
2019	41,583
2020	42,043
2021 and thereafter	253,202
Committed gross lease payments	409,156
Less: proceeds from sublease rental	8,174
Net operating lease obligation	$	400,982

Equity Award Plans (Tables)

12 Months Ended

Jul. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Options Activity



	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2014	5,830		$	13.02	7.0	$	395,507
Options granted	—		—
Options forfeited	(54	)	17.43
Options exercised	(2,505	)	11.99
Balance—July 31, 2015	3,271		$	13.74	6.2	$	562,906
Options vested and expected to vest—July 31, 2015	3,254		$	13.70	6.1	$	560,111
Options exercisable—July 31, 2015	2,578		$	12.13	6.1	$	447,799

Schedule of Restricted Stock Units Award Activity



	RSUs Outstanding
	Number of Shares		Weighted- Average Grant-Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2014	6,046		$	59.84	1.4	$	488,880
RSUs granted	4,142		122.36
RSUs vested	(2,511	)	58.40
RSUs forfeited	(494	)	70.55
Balance—July 31, 2015	7,183		$	95.66	1.2	$	1,334,817
RSUs vested and expected to vest—July 31, 2015	6,582		$	94.90	1.2	$	1,223,133

Shares Available For Grant

The following table presents the stock activity and the total number of shares available for grant as of July 31, 2015 (in thousands):



	Number of shares
Balance—July 31, 2014	8,066
Authorized	3,578
RSUs granted	(4,142	)
Repurchased	—
Options forfeited	54
RSUs forfeited	494
Balance—July 31, 2015	8,050

Summary of Stock Options, Valuation Assumptions

The following table summarizes the assumptions related to our stock options:



	Year Ended July 31, 2013
Risk-free interest rate	1.0%
Expected term	6 years
Volatility	50%
Dividend yield	—%

Summary of Employee Stock Purchase Plan, Valuation Assumptions

The following table summarizes the assumptions related to our 2012 ESPP:



	Year Ended July 31,
	2015	2014	2013
Risk-free interest rate	0.1%	0.1%	0.1%
Expected term	< 1 year	< 1 year	< 1 year
Volatility	40%	40%	42%
Dividend yield	—%	—%	—%

Schedule of Allocation of Share Based Compensation Expense

The following table summarizes share-based compensation included in costs and expenses (in thousands):



	Year Ended July 31,
	2015		2014		2013
Cost of product revenue	$	3,858	$	1,636	$	765
Cost of services revenue	20,425		9,434		3,586
Research and development	74,837		29,524		9,931
Sales and marketing	84,113		42,647		20,493
General and administrative	38,198		16,668		9,101
Total share-based compensation	$	221,431	$	99,909	$	43,876

Income Taxes (Tables)

12 Months Ended

Jul. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

The following table presents the components of income (loss) before income taxes (in thousands):



	Year Ended July 31,
	2015			2014			2013
United States	$	(47,493	)	$	(149,243	)	$	5,198
Foreign	(108,084		)	(72,917		)	(23,854		)
Total	$	(155,577	)	$	(222,160	)	$	(18,656	)

Schedule of Components of Income Tax Expense (Benefit)

The following table summarizes the provision for income taxes (in thousands):



	Year Ended July 31,
	2015			2014			2013
Federal:
Current	$	1,757		$	795		$	5,883
Deferred	(2,972		)	—			—
State:
Current	682			230			1,758
Deferred	(431		)	(324		)	—
Foreign:
Current	10,738			4,679			3,296
Deferred	(369		)	(1,088		)	(347		)
Total	$	9,405		$	4,292		$	10,590

Schedule of Effective Income Tax Rate Reconciliation

The following table presents the items accounting for the difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes:



	Year Ended July 31,
	2015		2014		2013
Federal statutory rate	35.0	%	35.0	%	35.0	%
Effect of:
State taxes, net of federal tax benefit	3.6		1.3		1.0
Foreign income at other than U.S. rates	(6.5	)	(12.1	)	(62.4	)
Change in valuation allowance	(28.5	)	(21.3	)	(32.5	)
Share-based compensation	(10.2	)	(3.2	)	(16.1	)
Meals and entertainment	(0.6	)	(0.3	)	(2.0	)
Amortization of deferred tax charges	(2.2	)	—		—
Research credits	6.7		1.3		25.2
Other, net	(3.3	)	(2.6	)	(5.0	)
Total	(6.0	)%	(1.9	)%	(56.8	)%

Schedule of Deferred Tax Assets and Liabilities

The following table presents the components of our deferred tax assets and liabilities as of July 31, 2015 and July 31, 2014 (in thousands):



	July 31,
	2015			2014
Deferred tax assets:
Accruals and reserves	$	38,936		$	7,942
Deferred revenue	35,261			30,430
Research and development and foreign tax credits	20,123			8,741
Net operating loss carryforwards	18,376			32,282
Share-based compensation	35,893			17,715
Gross deferred tax assets	148,589			97,110
Valuation allowance	(138,354		)	(89,309		)
Total deferred tax assets	10,235			7,801
Deferred tax liabilities:
Fixed assets and intangible assets	(7,919		)	(15,040		)
Other deferred tax liabilities	(1,631		)	(565		)
Total deferred tax liabilities	(9,550		)	(15,605		)
Total	$	685		$	(7,804	)

Schedule of Unrecognized Tax Benefits Roll Forward

The following table presents a reconciliation of the beginning and ending amount of our gross unrecognized tax benefits (in thousands):



	Year Ended July 31,
	2015			2014		2013
Unrecognized tax benefits at the beginning of the period	$	10,385		$	6,561	$	2,630
Additions for tax positions taken in prior years	6,061			428		585
Reductions for tax positions taken in prior years	(612		)	—		(3		)
Additions for tax positions taken in the current year	51,324			3,396		3,349
Unrecognized tax benefits at the end of the period	$	67,158		$	10,385	$	6,561

Net Income (Loss) Per Share (Tables)

12 Months Ended

Jul. 31, 2015

Earnings Per Share [Abstract]

Computation of basic and diluted net income (loss) per share of common stock

The following table presents the computation of basic and diluted net loss per share of common stock (in thousands, except per share data):



	Year Ended July 31,
	2015			2014			2013
Net loss	$	(164,982	)	$	(226,452	)	$	(29,246	)
Weighted-average shares used to compute net loss per share, basic and diluted	81,619			74,291			68,682
Net loss per share, basic and diluted	$	(2.02	)	$	(3.05	)	$	(0.43	)

Schedule of antidilutive securities excluded from computation of net income (loss) per share

The following securities were excluded from the computation of diluted net loss per share of common stock for the periods presented as their effect would have been antidilutive (in thousands):



	Year Ended July 31,
	2015	2014	2013
Options	3,271	5,830	10,033
RSUs	7,183	6,046	2,241
ESPP shares	78	95	114
Convertible senior notes	5,214	5,214	—
Warrants related to the issuance of convertible senior notes	5,214	5,214	—
Total	20,960	22,399	12,388

Segment Information (Tables)

12 Months Ended

Jul. 31, 2015

Segment Reporting [Abstract]

Revenue from External Customers by Geographic Areas

The following table presents revenue by geographic theater (in thousands):



	Year Ended July 31,
	2015		2014		2013
Revenue:
Americas
United States	$	593,741	$	363,174	$	228,604
Other Americas	45,587		33,452		19,012
Total Americas	639,328		396,626		247,616
EMEA	178,719		126,915		91,496
APAC	110,005		74,638		56,995
Total revenue	$	928,052	$	598,179	$	396,107

Revenue from External Customers by Products and Services

The following table presents revenue for groups of similar products and services (in thousands):



	Year Ended July 31,
	2015		2014		2013
Revenue:
Product	$	492,658	$	340,143	$	243,707
Services
Subscription	212,676		123,236		71,203
Support and maintenance	222,718		134,800		81,197
Total services	435,394		258,036		152,400
Total revenue	$	928,052	$	598,179	$	396,107

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Jul. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following tables set forth selected unaudited financial data for the years ended July 31, 2015 and 2014 (in thousands, except per share amounts):



	Three Months Ended
	Oct. 31, 2014			Jan. 31, 2015			Apr. 30, 2015			Jul. 31, 2015
Revenue:
Product	$	101,476		$	115,621		$	121,524		$	154,037
Services	90,870			102,034			112,648			129,842
Total revenue	192,346			217,655			234,172			283,879
Cost of revenue:
Product	29,141			30,640			32,851			38,462
Services	24,320			28,685			31,544			35,856
Total cost of revenue	53,461			59,325			64,395			74,318
Total gross profit	138,885			158,330			169,777			209,561
Operating expenses:
Research and development	37,305			46,948			48,486			53,089
Sales and marketing	106,366			122,875			131,026			162,429
General and administrative	18,977			27,023			26,989			28,576
Total operating expenses	162,648			196,846			206,501			244,094
Operating loss	(23,763		)	(38,516		)	(36,724		)	(34,533		)
Interest expense	(5,489		)	(5,539		)	(5,631		)	(5,666		)
Other income (expense), net	341			344			(55		)	(346		)
Loss before income taxes	(28,911		)	(43,711		)	(42,410		)	(40,545		)
Provision for (benefit from) income taxes	1,157			(703		)	3,525			5,426
Net loss	$	(30,068	)	$	(43,008	)	$	(45,935	)	$	(45,971	)
Net loss per share, basic and diluted	$	(0.38	)	$	(0.53	)	$	(0.56	)	$	(0.55	)



	Three Months Ended
	Oct. 31, 2013			Jan. 31, 2014			Apr. 30, 2014			Jul. 31, 2014
Revenue:
Product	$	75,485		$	80,823		$	84,128		$	99,707
Services	52,695			60,245			66,572			78,524
Total revenue	128,180			141,068			150,700			178,231
Cost of revenue:
Product	17,954			20,221			20,425			26,903
Services	15,853			17,283			19,285			21,704
Total cost of revenue	33,807			37,504			39,710			48,607
Total gross profit	94,373			103,564			110,990			129,624
Operating expenses:
Research and development	19,893			24,253			27,837			32,830
Sales and marketing	67,366			76,734			83,995			106,668
General and administrative	14,125			19,733			23,717			15,574
Legal settlement (Note 9)	—			20,000			121,173			—
Total operating expenses	101,384			140,720			256,722			155,072
Operating loss	(7,011		)	(37,156		)	(145,732		)	(25,448		)
Interest expense	(8		)	(14		)	(13		)	(1,848		)
Other income (expense), net	405			(170		)	430			(5,595		)
Loss before income taxes	(6,614		)	(37,340		)	(145,315		)	(32,891		)
Provision for (benefit from) income taxes	1,247			2,606			1,272			(833		)
Net loss	$	(7,861	)	$	(39,946	)	$	(146,587	)	$	(32,058	)
Net loss per share, basic and diluted	$	(0.11	)	$	(0.55	)	$	(1.96	)	$	(0.41	)

Description of Business and Summary of Significant Accounting Policies (Concentrations) (Details)	12 Months Ended
	Jul. 31, 2015
Accounts Receivable
Concentration Risk
Concentration Risk, Number of Customers	2
Accounts Receivable \| Customer A
Concentration Risk
Concentration Risk, Percentage	36.00%
Accounts Receivable \| Customer B
Concentration Risk
Concentration Risk, Percentage	30.00%
Revenue
Concentration Risk
Concentration Risk, Number of Customers	3
Revenue \| Customer A
Concentration Risk
Concentration Risk, Percentage	31.00%
Revenue \| Customer B
Concentration Risk
Concentration Risk, Percentage	29.00%
Revenue \| Customer C
Concentration Risk
Concentration Risk, Percentage	11.00%

Description of Business and Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Advertising Expense	$ 4.8	$ 3.7	$ 1.8

Description of Business and Summary of Significant Accounting Policies (Convertible Senior Notes) (Details) $ in Millions	Jun. 30, 2014 USD ($)
Debt Disclosure [Abstract]
Principal amount	$ 575.0
Contractual interest rate (in percentage)	0.00%

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	$ 413,165	$ 118,690
Long-term investments	538,841	201,880
Other assets	0	1,220
Total assets measured at fair value	952,006	321,790
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
Other assets	0	1,220
Total assets measured at fair value	0	1,220
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	413,165	118,690
Long-term investments	538,841	201,880
Other assets	0	0
Total assets measured at fair value	952,006	320,570
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
Other assets	0	0
Total assets measured at fair value	0	0
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	1,000	0
Long-term investments	0	1,000
Other assets	0	1,220
Certificates of deposit \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
Other assets	0	1,220
Certificates of deposit \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	1,000	0
Long-term investments	0	1,000
Other assets	0	0
Certificates of deposit \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
Other assets	0	0
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	97,825	22,239
Long-term investments	92,902	39,018
Corporate debt securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
Corporate debt securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	97,825	22,239
Long-term investments	92,902	39,018
Corporate debt securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	314,340	96,451
Long-term investments	445,939	161,862
U.S. government and agency securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	0	0
U.S. government and agency securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	314,340	96,451
Long-term investments	445,939	161,862
U.S. government and agency securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0	0
Long-term investments	$ 0	$ 0

Investments (Available-for-Sale Investments) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Schedule of Available-for-sale Securities
Amortized Cost	$ 952,094	$ 320,675
Unrealized Gains	295	61
Unrealized Losses	(383)	(166)
Estimated Fair Value	952,006	320,570
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	1,000	1,000
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	1,000	1,000
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	190,882	61,299
Unrealized Gains	24	16
Unrealized Losses	(179)	(58)
Estimated Fair Value	190,727	61,257
U.S. government and agency securities
Schedule of Available-for-sale Securities
Amortized Cost	760,212	258,376
Unrealized Gains	271	45
Unrealized Losses	(204)	(108)
Estimated Fair Value	$ 760,279	$ 258,313

Investments (Available-for-Sale Investments in Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	$ 483,967	$ 186,358
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	483,967	186,358
Less than 12 Months, Unrealized Loss	(383)	(166)
12 Months or Greater, Unrealized Loss	0	0
Unrealized Losses	(383)	(166)
Corporate debt securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	134,976	43,868
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	134,976	43,868
Less than 12 Months, Unrealized Loss	(179)	(58)
12 Months or Greater, Unrealized Loss	0	0
Unrealized Losses	(179)	(58)
U.S. government and agency securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	348,991	142,490
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	348,991	142,490
Less than 12 Months, Unrealized Loss	(204)	(108)
12 Months or Greater, Unrealized Loss	0	0
Unrealized Losses	$ (204)	$ (108)

Investments (Proceeds from Sales of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of investments	$ 18,508	$ 74,597	$ 13,491

Investments (Available-for-Sale Investments, Contractual Maturities) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Amortized Cost
Due within one year	$ 413,148
Due between one and three years	538,946
Total	952,094
Fair Value
Due within one year	413,165
Due between one and three years	538,841
Total	$ 952,006	$ 320,570

Acquisitions (Additional Details of Acquisitions) (Details) - Cyvera, Ltd. - USD ($) shares in Millions, $ in Millions	Apr. 09, 2014	Jul. 31, 2014
Restricted Stock Units (RSUs)
Business Acquisition
Equity Interest Issued	$ 6.4
Restricted Stock
Business Acquisition
Equity Interest Issued (in shares)	0.3
Equity Interest Issued	$ 17.6
Period to release restriction on restricted common stock (in years)	3 years
General and administrative
Business Acquisition
Acquisition costs		$ 3.9

Acquisitions (Consideration Transferred) (Details) - USD ($) $ in Thousands, shares in Millions	May 22, 2015	Apr. 09, 2014	Dec. 26, 2013
CirroSecure, Inc.
Business Acquisition
Cash	$ 15,300
Cyvera, Ltd.
Business Acquisition
Cash		$ 90,170
Total		$ 177,647
Cyvera, Ltd. \| Common Stock
Business Acquisition
Equity Interest Issued (in shares)		1.3
Common stock		$ 87,477
Morta Security, Inc.
Business Acquisition
Cash			$ 10,300

Acquisitions (Purchase price allocation, Cyvera and Morta) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014	Apr. 09, 2014	Dec. 26, 2013	Jul. 31, 2013
Business Acquisition
Goodwill	$ 163,522	$ 155,033			$ 0
Cyvera, Ltd.
Business Acquisition
Cash			$ 6,930
Goodwill			145,275
Identified intangible assets			42,300
Accrued and other liabilities, net			(6,950)
Long-term deferred tax liability, net			(9,908)
Total			$ 177,647
Morta Security, Inc.
Business Acquisition
Goodwill				$ 10,127
Identified intangible assets				2,200
Accrued and other liabilities, net				(1,982)
Total				$ 10,345

Acquisitions (Purchase Price Allocation, CirroSecure) (Details) - USD ($) $ in Thousands	May 22, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Business Acquisition
Goodwill		$ 163,522	$ 155,033	$ 0
CirroSecure, Inc.
Business Acquisition
Goodwill	$ 8,100
Liabilities, net	3,800
Developed Technology \| CirroSecure, Inc.
Business Acquisition
Identified intangible assets	$ 11,000
Estimated Useful Life (in years)	7 years

Acquisitions (Intangible assets acquired as part of business combination) (Details) - USD ($) $ in Thousands			12 Months Ended
	Apr. 09, 2014	Dec. 26, 2013	Jul. 31, 2015
Cyvera, Ltd.
Business Acquisition
Intangible Assets Acquired	$ 42,300
Cyvera, Ltd. \| Developed Technology
Business Acquisition
Finite-lived Intangible Assets Acquired	$ 34,500
Estimated Useful Life (in years)	7 years		7 years
Cyvera, Ltd. \| In-process research and development
Business Acquisition
Indefinite-lived Intangible Assets Acquired	$ 7,600
Cyvera, Ltd. \| Other
Business Acquisition
Finite-lived Intangible Assets Acquired	$ 200
Estimated Useful Life (in years)	2 years
Morta Security, Inc.
Business Acquisition
Finite-lived Intangible Assets Acquired		$ 2,200
Morta Security, Inc. \| In-process research and development held for defensive purposes
Business Acquisition
Finite-lived Intangible Assets Acquired		$ 1,900
Estimated Useful Life (in years)		3 years
Morta Security, Inc. \| Other
Business Acquisition
Finite-lived Intangible Assets Acquired		$ 300
Estimated Useful Life (in years)		2 years

Acquisitions (Pro Forma Financial Information) (Details) - Cyvera, Ltd. - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Business Acquisition
Total revenue	$ 598,254	$ 396,131
Net loss	$ (241,920)	$ (43,041)

Goodwill and Intangible Assets (Goodwill Roll-forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Goodwill Roll Forward
Goodwill, beginning	$ 155,033	$ 0
Goodwill acquired	8,120	155,033
Measurement period adjustments	369
Goodwill, ending	$ 163,522	$ 155,033

Goodwill and Intangible Assets (Intangible Assets and Related Amortization) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Finite and Infinite Lived Intangible Assets
Gross Carrying Amount, Intangible assets with finite live	$ 63,656	$ 43,446
Accumulated Amortization	(11,000)	(3,091)
Net Carrying Amount, Intangible Assets with Finite Live	52,656	40,355
Indefinite-Lived Intangible Assets	0	7,600
Total purchased intangible assets, gross, finite and infinite lived	63,656	51,046
Total purchased intangible assets, net, finite and infinite lived	52,656	47,955
Developed Technology
Finite and Infinite Lived Intangible Assets
Gross Carrying Amount, Intangible assets with finite live	53,100	34,500
Accumulated Amortization	(7,738)	(1,643)
Net Carrying Amount, Intangible Assets with Finite Live	45,362	32,857
Acquired intellectual property
Finite and Infinite Lived Intangible Assets
Gross Carrying Amount, Intangible assets with finite live	8,156	6,546
Accumulated Amortization	(1,888)	(958)
Net Carrying Amount, Intangible Assets with Finite Live	6,268	5,588
In-process research and development held for defensive purposes
Finite and Infinite Lived Intangible Assets
Gross Carrying Amount, Intangible assets with finite live	1,900	1,900
Accumulated Amortization	(1,003)	(370)
Net Carrying Amount, Intangible Assets with Finite Live	897	1,530
Other
Finite and Infinite Lived Intangible Assets
Gross Carrying Amount, Intangible assets with finite live	500	500
Accumulated Amortization	(371)	(120)
Net Carrying Amount, Intangible Assets with Finite Live	129	380
In-process research and development
Finite and Infinite Lived Intangible Assets
Indefinite-Lived Intangible Assets	$ 0	$ 7,600

Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 09, 2014	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Finite-Lived Intangible Assets
Amortization of Intangible Assets		$ 7.9	$ 2.9	$ 0.1
Cyvera, Ltd. \| Developed Technology
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	7 years	7 years

Goodwill and Intangible Assets (Future Amortization Expense) (Details) $ in Thousands	Jul. 31, 2015 USD ($)
Acquired Finite-Lived Intangible Assets
2016	$ 9,295
2017	8,703
2018	8,203
2019	8,097
2020	8,071
2021 and thereafter	10,287
Developed Technology
Acquired Finite-Lived Intangible Assets
2016	7,586
2017	7,586
2018	7,586
2019	7,586
2020	7,586
2021 and thereafter	7,432
Acquired intellectual property
Acquired Finite-Lived Intangible Assets
2016	947
2017	853
2018	617
2019	511
2020	485
2021 and thereafter	2,855
In-process research and development held for defensive purposes
Acquired Finite-Lived Intangible Assets
2016	633
2017	264
2018	0
2019	0
2020	0
2021 and thereafter	0
Other
Acquired Finite-Lived Intangible Assets
2016	129
2017	0
2018	0
2019	0
2020	0
2021 and thereafter	$ 0

Property and Equipment (Property and Equipment by Type) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Property, Plant and Equipment
Property and equipment, gross	$ 110,662	$ 79,366
Less: accumulated depreciation	(47,784)	(30,622)
Total property and equipment, net	62,878	48,744
Computers, equipment, and software
Property, Plant and Equipment
Property and equipment, gross	62,599	38,147
Leasehold Improvements
Property, Plant and Equipment
Property and equipment, gross	25,461	21,258
Demonstration units
Property, Plant and Equipment
Property and equipment, gross	15,971	14,832
Furniture and fixtures
Property, Plant and Equipment
Property and equipment, gross	$ 6,631	$ 5,129

Property and Equipment (Depreciation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 20.3	$ 14.0	$ 9.8

Convertible Senior Notes (Additional Information) (Details) $ / shares in Units, $ in Thousands, shares in Millions			12 Months Ended
	Jul. 31, 2015 USD ($)	Jun. 30, 2014 USD ($) shares $ / shares	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)
Debt Instrument, Redemption
Convertible Senior Notes, Issuance Date		Jun. 30, 2014
Principal amount		$ 575,000
Contractual interest rate (in percentage)		0.00%
Maturity Date		Jul. 01, 2019
Number of Common Stock Convertible at Initial Conversion Rate (in shares) \| shares		5.2
Convertible Senior Notes, Initial Conversion Rate (in shares per $1000 principal amount)		9.068
Convertible Senior Notes, Initial Conversion Price (in usd per share) \| $ / shares		$ 110.28
Convertible Senior Notes, Threshold Trading Days (in days)		20
Convertible Senior Notes, Threshold Consecutive Trading Days (in days)		30 days
Convertible Senior Notes, Threshold Percentage of Stock Price Trigger (in percentage)		130.00%
Convertible Senior Notes, Threshold Business Days, Per $1,000 Principal (in days)		5
Convertible Senior Notes, Threshold Consecutive Trading Days, Per $1,000 Principal (in days)		5 days
Convertible Senior Notes, Threshold Percentage of Note Price Trigger, Per $1,000 Principal (in percentage)		98.00%
Repurchase Price As Percentage Of Principal Amount Plus Accrued And Unpaid Interest In Event Of Change (in percentage)		100.00%
Debt issuance costs		$ 12,500
Equity issuance costs		$ 2,900
If-converted Value in Excess of Principal	$ 376,700
Shares Of Common Stock Covered By Note Hedges (in shares) \| shares		5.2
Aggregate amount paid to purchase note hedges - additional paid-in capital				$ 110,975
Number of Common Stock Covered by Warrants (in shares) \| shares		5.2
Strike Price of Warrants (in usd per share) \| $ / shares		$ 137.85
Proceeds from issuance of warrants			$ 0	78,258	$ 0
Level 2
Debt Instrument, Redemption
Fair Value of Convertible Senior Notes	$ 994,800		$ 994,800	$ 587,100

Convertible Senior Notes (Components of Convertible Senior Notes) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Debt Instruments [Abstract]
Principal amount	$ 575,000	$ 575,000
Less: debt discount, net of amortization	87,916	108,125
Net carrying amount	487,084	466,875
Equity (including temporary equity)	$ (109,785)	$ (109,785)

Convertible Senior Notes (Schedule of Interest Expense Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Debt Disclosure [Abstract]
Amortization of debt issuance costs	$ 2,056	$ 166
Amortization of debt discount	20,209	1,660
Total interest expense recognized	$ 22,265	$ 1,826
Effective interest rate of the liability component (in percentage)	4.80%	4.80%

Commitments and Contingencies (Leases) (Details) ft² in Thousands, $ in Thousands	1 Months Ended
	Jul. 31, 2013 USD ($)	Sep. 30, 2012 USD ($) ft²	Aug. 31, 2015 ft²	Jul. 31, 2015 USD ($)	May 31, 2015 USD ($) ft²
Operating Leased Assets
Total payments under the lease agreements				$ 409,156
Payments under this sub-lease				$ 8,174
Subsequent Event
Operating Leased Assets
Area of Real Estate Property \| ft²			300
Lease Arrangement No.1
Operating Leased Assets
Number of Lease Agreements		2
Area of Real Estate Property \| ft²		300
Number of Lease Renewal Options		2
Renewal Term (in years)		5 years
Total payments under the lease agreements		$ 94,300
Sublease Arrangement
Operating Leased Assets
Term of Sublease Contract (in months)	51 months
Payments under this sub-lease	$ 10,700
Rent credit under sub-lease	$ 500
Lease Arrangement No. 2
Operating Leased Assets
Number of Lease Agreements					3
Area of Real Estate Property \| ft²					752
Total payments under the lease agreements					$ 275,100

Commitments and Contingencies (Rent Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Leases [Abstract]
Rent Expense	$ 15.4	$ 13.2	$ 4.4

Commitments and Contingencies (Lease Commitment Schedule) (Details) $ in Thousands	Jul. 31, 2015 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	$ 20,821
2017	24,374
2018	27,133
2019	41,583
2020	42,043
2021 and thereafter	253,202
Committed gross lease payments	409,156
Less: proceeds from sublease rental	(8,174)
Net operating lease obligation	$ 400,982

Commitments and Contingencies (Contract Manufacturer Commitments) (Details) $ in Millions	Jul. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contract Manufacturer Commitments	$ 42.8

Legal Settlement (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			12 Months Ended
	May 27, 2014	Jan. 27, 2014	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Loss Contingencies
Change in fair value of common stock warrant			$ 0	$ 5,859	$ 0
Juniper
Loss Contingencies
Legal settlement in cash, amount	$ 75,000
Legal settlement in common stock (in shares)	1.1
Legal settlement in warrant, number of shares of common stock purchasable (in shares)	0.5
Period of mutual covenant-not-to-sue for patent infringement	8 years
Legal settlement, total amount, settlement date	$ 182,500
Legal settlement in common stock, amount, settlement date	75,200
legal settlement in warrant, amount, settlement date	$ 32,200
Legal settlement in warrant, exercise price (in usd per share)	$ 0.0001
Change in fair value of common stock warrant				5,900
Settlement amount allocated to the licensing of intellectual property	$ 61,300
Settlement amount allocated to the mutual dismissal of claims	54,300
Settlement amount allocated to the mutual covenant not-to-sue	$ 66,900
Amortization period of intellectual property licensing (in years)	5 years
Fortinet
Loss Contingencies
Legal settlement in cash, amount		$ 20,000
Legal settlement expense				$ 20,000

Stockholders' Equity (Secondary Offering) (details) - Secondary offering $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Oct. 31, 2012 USD ($) $ / shares shares
Class of Stock
Proceeds from sale of stock in public offering received by existing shareholders \| $	$ 290.3
Common stock
Class of Stock
Shares of common stock sold in public offering by existing shareholders (in shares) \| shares	4.8
Price per share (in usd per share) \| $ / shares	$ 63.00

Equity Award Plans (Share-Based Compensation Plans) (Details)	12 Months Ended
	Jul. 31, 2015 USD ($) $ / shares shares
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period (in years)	10 years
Minimum exercise price for employees owning more than 10% of total combined voting power of all class of stock, percentage of fair market value (in percentage)	110.00%
Minimum exercise price for employees owning less than 10% of total combined voting power of all class of stock, percentage of fair market value (in percentage)	100.00%
Minimum exercise price of non-statutory stock option and options granted to consultants, percentage of fair market value (in percentage)	100.00%
Common Stock, Shares Reserved for Future Issuance (in shares)	18,500,000
Increase in number of shares reserved for issuance on the first day of fiscal year, maximum (in shares)	8,000,000
Increase in number of shares reserved for issuance on the first day of fiscal year, percentage of shares of common stock on the last day of preceeding fiscal year, maximum (in percentage)	4.50%
2012 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Award Vesting Period (in years)	3 years
2012 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Award Vesting Period (in years)	4 years
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award
Discount from Lesser of Market Price on Purchase Date or Offering Date (in percentage)	85.00%
ESPP Maximum Employee Subscription Rate (in percentage)	15.00%
ESPP Maximum Number of Shares Per Employee during a Six Months Period (in shares)	625
ESPP Maximum Purchase of Common Stock Value Per Employee for each Calendar Year \| $	$ 25,000
Common Stock, Shares Reserved for Future Issuance (in shares)	1,800,000
Increase in number of shares reserved for issuance on the first day of fiscal year, maximum (in shares)	2,000,000
Increase in number of shares reserved for issuance on the first day of fiscal year, percentage of shares of common stock on the last day of preceeding fiscal year, maximum (in percentage)	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Issuance of common stock in connection with employee stock purchase plan (in shares)	200,000
Average Price of Common Stock Purchased During the Period (in usd per share) \| $ / shares	$ 75.09

Equity Award Plans (Stock Options Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Options, Outstanding Roll Forward
Balance, beginning (in shares)	5,830
Options granted (in shares)	0
Options forfeited (in shares)	(54)
Options exercised (in shares)	(2,505)
Balance, ending (in shares)	3,271	5,830
Options, Outstanding, Weighted Average Exercise Price Roll Forward
Balance, beginning (in usd per share)	$ 13.02
Options granted (in usd per share)	0.00
Options forfeited (in usd per share)	17.43
Options exercised (in usd per share)	11.99
Balance, ending (in usd per share)	$ 13.74	$ 13.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Life (in years)	6 years 2 months	7 years
Aggregate Intrinsic Value	$ 562,906	$ 395,507
Options vested and expected to vest (in shares)	3,254
Options vested and expected to vest, Weighted-Average Exercise Price (in usd per share)	$ 13.70
Options vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	6 years 1 month
Options vested and expected to vest, Aggregate Intrinsic Value	$ 560,111
Options exercisable (in shares)	2,578
Options exercisable, Weighted-Average Exercise Price (in usd per share)	$ 12.13
Options exercisable, Weighted-Average Remaining Contractual Term (in years)	6 years 1 month
Options exercisable, Aggregate Intrinsic Value	$ 447,799
Options, Grants in Period, Weighted Average Grant Date Fair Value (in usd per share)			$ 26.09
Options, Exercises in Period, Total Intrinsic Value	301,100	198,800	$ 186,800
Options, Vested in Period, Grant Date Fair Value	$ 14,600	$ 17,100	$ 21,400

Equity Award Plans (RSUs Activities) (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
RSUs, Outstanding Roll Forward
Balance, beginning (in shares)	6,046
RSUs granted (in shares)	4,142
RSUs vested (in shares)	(2,511)
RSUs forfeited (in shares)	(494)
Balance, ending (in shares)	7,183	6,046
RSUs, Outstanding, Weighted Average Grant-Date Fair Value Per Share
Balance, beginning (in usd per share)	$ 59.84
RSUs granted (in usd per share)	122.36	$ 61.00	$ 54.51
RSUs vested (in usd per share)	58.40
RSUs forfeited (in usd per share)	70.55
Balance, ending (in usd per share)	$ 95.66	$ 59.84
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Term (in years)	1 year 2 months	1 year 5 months
Aggregate Intrinsic Value	$ 1,334,817	$ 488,880
RSUs vested and expected to vest (in shares)	6,582
RSUs vested and expected to vest, Weighted-Average Grant-Date Fair Value Per Share (in usd per share)	$ 94.90
RSUs vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	1 year 2 months
RSUs vested and expected to vest, Aggregate Intrinsic Value	$ 1,223,133
Fair value of RSUs vested	$ 350,400	$ 57,400	$ 300

Equity Award Plans (Shares Available for Grant Roll-forward) (Details) shares in Thousands	12 Months Ended
	Jul. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for grant, beginning (in shares)	8,066
Authorized (in shares)	3,578
Repurchased (in shares)	0
Options forfeited (in shares)	54
Shares available for grant, ending (in shares)	8,050
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
RSUs granted (in shares)	(4,142)
RSUs forfeited (in shares)	494

Equity Award Plans (Stock Options, Valuation Assumptions) (Details) - Stock Option	12 Months Ended
	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate (in percentage)	1.00%
Expected Term (in years)	6 years
Volatility (in percentage)	50.00%
Dividend yield (in percentage)	0.00%

Equity Award Plans (Employee Stock Purchase Plan, Valuation Assumptions) (Details) - Employee Stock Purchase Plan (ESPP)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate (in percentage)	0.10%	0.10%	0.10%
Expected Term (in years)	6 months	6 months	6 months
Volatility (in percentage)	40.00%	40.00%	42.00%
Dividend yield (in percentage)	0.00%	0.00%	0.00%

Equity Award Plans (Allocation of Share Based Compensation Expense By Functional Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated Share-based Compensation Expense	$ 221,431	$ 99,909	$ 43,876
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated Share-based Compensation Expense	3,858	1,636	765
Cost of service revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated Share-based Compensation Expense	20,425	9,434	3,586
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated Share-based Compensation Expense	74,837	29,524	9,931
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated Share-based Compensation Expense	84,113	42,647	20,493
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated Share-based Compensation Expense	$ 38,198	$ 16,668	$ 9,101

Equity Award Plans (Allocation of Share-based Compensation Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Allocated Share-based Compensation Expense	$ 221,431	$ 99,909	$ 43,876
Total compensation cost not yet recognized, nonvested awards, net of estimated forfeitures	$ 557,000
Compensation Cost Not yet Recognized, Period for Recognition (in years)	3 years
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Allocated Share-based Compensation Expense	$ 6,700	4,500	5,300
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Allocated Share-based Compensation Expense	84,113	42,647	20,493
Modification, Incremental Compensation Cost			1,900
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Allocated Share-based Compensation Expense	$ 38,198	16,668	$ 9,101
Modification, Incremental Compensation Cost		$ 3,400

Income Taxes (Loss Before Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]
United States									$ (47,493)	$ (149,243)	$ 5,198
Foreign									(108,084)	(72,917)	(23,854)
Loss before income taxes	$ (40,545)	$ (42,410)	$ (43,711)	$ (28,911)	$ (32,891)	$ (145,315)	$ (37,340)	$ (6,614)	$ (155,577)	$ (222,160)	$ (18,656)

Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Federal:
Current									$ 1,757	$ 795	$ 5,883
Deferred									(2,972)	0	0
State:
Current									682	230	1,758
Deferred									(431)	(324)	0
Foreign:
Current									10,738	4,679	3,296
Deferred									(369)	(1,088)	(347)
Total	$ 5,426	$ 3,525	$ (703)	$ 1,157	$ (833)	$ 1,272	$ 2,606	$ 1,247	$ 9,405	$ 4,292	$ 10,590

Income Taxes (Effective Tax Reconciliation) (Details)	12 Months Ended
Income Taxes (Effective Tax Reconciliation) (Details)	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	3.60%	1.30%	1.00%
Foreign income at other than U.S. rates	(6.50%)	(12.10%)	(62.40%)
Change in valuation allowance	(28.50%)	(21.30%)	(32.50%)
Share-based compensation	(10.20%)	(3.20%)	(16.10%)
Meals and entertainment	(0.60%)	(0.30%)	(2.00%)
Amortization of deferred tax charges	(2.20%)	0.00%	0.00%
Research credits	6.70%	1.30%	25.20%
Other, net	(3.30%)	(2.60%)	(5.00%)
Total	(6.00%)	(1.90%)	(56.80%)

Income Taxes (Components of the deferred tax assets and liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Deferred tax assets:
Accruals and reserves	$ 38,936	$ 7,942
Deferred revenue	35,261	30,430
Research and development and foreign tax credits	20,123	8,741
Net operating loss carryforwards	18,376	32,282
Share-based compensation	35,893	17,715
Gross deferred tax assets	148,589	97,110
Valuation allowance	(138,354)	(89,309)
Total deferred tax assets	10,235	7,801
Deferred tax liabilities
Fixed assets and intangible assets	(7,919)	(15,040)
Other deferred tax liabilities	(1,631)	(565)
Deferred Tax Liabilities, Gross	(9,550)	(15,605)
Total	$ 685	$ (7,804)

Income Taxes (Valuation Allowance) (Details) $ in Millions	12 Months Ended
Income Taxes (Valuation Allowance) (Details) $ in Millions	Jul. 31, 2015 USD ($)
Business Acquisition
Valuation Allowance, Increase (Decrease), Amount	$ 49.0
CirroSecure, Inc.
Business Acquisition
Valuation Allowance, Increase (Decrease), Amount	$ (3.4)

Income Taxes (Net Operating Loss Carryforward) (Details) $ in Millions	Jul. 31, 2015 USD ($)
Federal
Operating Loss Carryforwards
Operating Loss Carryforwards	$ 752.9
State
Operating Loss Carryforwards
Operating Loss Carryforwards	808.5
Foreign
Operating Loss Carryforwards
Operating Loss Carryforwards	$ 12.5

Income Taxes (Tax Credit Carryforwards) (Details) $ in Millions	Jul. 31, 2015 USD ($)
Federal \| Research Tax Credit Carryforward
Tax Credit Carryforward
Tax Credit Carryforward	$ 17.2
State \| Research Tax Credit Carryforward
Tax Credit Carryforward
Tax Credit Carryforward	21.8
Foreign
Tax Credit Carryforward
Tax Credit Carryforward	$ 1.1

Income Taxes (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]
Excess Tax Benefits Included in Federal Net Operating Losses, Share-based Awards	$ 680,700
Excess Tax Benefit included in State Net Operating Loss, Share-based Awards	648,200
Excess Tax Benefit Included in Foreign Net Operating Loss, Share-based Awards	12,500
Excess Tax Benefit Included in Federal Research and Development Tax Credit, Share-based Awards	5,300
Excess tax benefit from share-based compensation arrangements	2,455	$ 957	$ 6,762
Unrecognized Tax Benefits	67,158	10,385	6,561	$ 2,630
Unrecognized Tax Benefits that Would Affect Income Tax Expense	10,800	3,900
Income tax expense related to interest and penalties	1,100	300	$ 200
Interest and penalties accrued	1,800	$ 600
Undistributed Earnings of Foreign Subsidiaries	$ 7,000

Income Taxes (Unrecognized tax benefit roll-forward)(Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Unrecognized tax benefits, beginning	$ 10,385	$ 6,561	$ 2,630
Additions for tax positions taken in prior years	6,061	428	585
Reductions for tax positions taken in prior years	(612)	0	(3)
Additions for tax positions related to the current year	51,324	3,396	3,349
Unrecognized tax benefits, ending	$ 67,158	$ 10,385	$ 6,561

Net Income (Loss) Per Share (Computation of Basic and Diluted Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Earnings Per Share [Abstract]
Net loss	$ (45,971)	$ (45,935)	$ (43,008)	$ (30,068)	$ (32,058)	$ (146,587)	$ (39,946)	$ (7,861)	$ (164,982)	$ (226,452)	$ (29,246)
Weighted-average shares used to compute net loss per share, basic and diluted									81,619	74,291	68,682
Net loss per share, basic and diluted	$ (0.55)	$ (0.56)	$ (0.53)	$ (0.38)	$ (0.41)	$ (1.96)	$ (0.55)	$ (0.11)	$ (2.02)	$ (3.05)	$ (0.43)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details) - shares shares in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	20,960	22,399	12,388
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	3,271	5,830	10,033
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	7,183	6,046	2,241
ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	78	95	114
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	5,214	5,214	0
Warrants related to the issuance of convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	5,214	5,214	0

Segment Information (Revenue by geographic theater) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Segment Reporting Information
Revenues	$ 928,052	$ 598,179	$ 396,107
United States
Segment Reporting Information
Revenues	593,741	363,174	228,604
Other Americas
Segment Reporting Information
Revenues	45,587	33,452	19,012
Total Americas
Segment Reporting Information
Revenues	639,328	396,626	247,616
EMEA
Segment Reporting Information
Revenues	178,719	126,915	91,496
APAC
Segment Reporting Information
Revenues	$ 110,005	$ 74,638	$ 56,995

Segment Information (Revenue from External Customers by Products and Services) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Revenue from External Customer
Product	$ 154,037	$ 121,524	$ 115,621	$ 101,476	$ 99,707	$ 84,128	$ 80,823	$ 75,485	$ 492,658	$ 340,143	$ 243,707
Services	129,842	112,648	102,034	90,870	78,524	66,572	60,245	52,695	435,394	258,036	152,400
Total revenue	$ 283,879	$ 234,172	$ 217,655	$ 192,346	$ 178,231	$ 150,700	$ 141,068	$ 128,180	928,052	598,179	396,107
Subscription
Revenue from External Customer
Services									212,676	123,236	71,203
Support and maintenance
Revenue from External Customer
Services									$ 222,718	$ 134,800	$ 81,197

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Revenue:
Product	$ 154,037	$ 121,524	$ 115,621	$ 101,476	$ 99,707	$ 84,128	$ 80,823	$ 75,485	$ 492,658	$ 340,143	$ 243,707
Services	129,842	112,648	102,034	90,870	78,524	66,572	60,245	52,695	435,394	258,036	152,400
Total revenue	283,879	234,172	217,655	192,346	178,231	150,700	141,068	128,180	928,052	598,179	396,107
Cost of revenue:
Product	38,462	32,851	30,640	29,141	26,903	20,425	20,221	17,954	131,094	85,503	63,412
Services	35,856	31,544	28,685	24,320	21,704	19,285	17,283	15,853	120,405	74,125	46,344
Total cost of revenue	74,318	64,395	59,325	53,461	48,607	39,710	37,504	33,807	251,499	159,628	109,756
Total gross profit	209,561	169,777	158,330	138,885	129,624	110,990	103,564	94,373	676,553	438,551	286,351
Operating expenses:
Research and development	53,089	48,486	46,948	37,305	32,830	27,837	24,253	19,893	185,828	104,813	62,482
Sales and marketing	162,429	131,026	122,875	106,366	106,668	83,995	76,734	67,366	522,696	334,763	199,771
General and administrative	28,576	26,989	27,023	18,977	15,574	23,717	19,733	14,125	101,565	73,149	42,719
Legal settlement (Note 9)					0	121,173	20,000	0	0	141,173	0
Total operating expenses	244,094	206,501	196,846	162,648	155,072	256,722	140,720	101,384	810,089	653,898	304,972
Operating loss	(34,533)	(36,724)	(38,516)	(23,763)	(25,448)	(145,732)	(37,156)	(7,011)	(133,536)	(215,347)	(18,621)
Interest Expense	(5,666)	(5,631)	(5,539)	(5,489)	(1,848)	(13)	(14)	(8)	(22,325)	(1,883)	(74)
Other income (expense), net	(346)	(55)	344	341	(5,595)	430	(170)	405	284	(4,930)	39
Loss before income taxes	(40,545)	(42,410)	(43,711)	(28,911)	(32,891)	(145,315)	(37,340)	(6,614)	(155,577)	(222,160)	(18,656)
Provision (benefit) for income taxes	5,426	3,525	(703)	1,157	(833)	1,272	2,606	1,247	9,405	4,292	10,590
Net loss	$ (45,971)	$ (45,935)	$ (43,008)	$ (30,068)	$ (32,058)	$ (146,587)	$ (39,946)	$ (7,861)	$ (164,982)	$ (226,452)	$ (29,246)
Net loss per share, basic and diluted	$ (0.55)	$ (0.56)	$ (0.53)	$ (0.38)	$ (0.41)	$ (1.96)	$ (0.55)	$ (0.11)	$ (2.02)	$ (3.05)	$ (0.43)