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Document and Entity Information Document - USD ($)	12 Months Ended
Document and Entity Information Document - USD ($)	Jul. 31, 2016	Aug. 24, 2016	Jan. 29, 2016
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, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Document Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		90,850,457
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 12,713,712,655

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Current assets:
Cash and cash equivalents	$ 734.4	$ 375.8
Short-term investments	551.2	413.2
Accounts receivable, net of allowance for doubtful accounts of $2.4 and $0.7 at July 31, 2016 and July 31, 2015, respectively	348.7	212.4
Prepaid expenses and other current assets	84.8	72.6
Total current assets	1,719.1	1,074.0
Property and equipment, net	117.2	62.9
Long-term investments	652.8	538.8
Goodwill	163.5	163.5
Intangible assets, net	44.0	52.7
Other assets	64.6	73.3
Total assets	2,761.2	1,965.2
Current liabilities:
Accounts payable	30.2	13.2
Accrued compensation	73.5	79.8
Accrued and other liabilities	39.2	28.2
Deferred revenue	703.9	423.9
Convertible senior notes, net	0.0	487.1
Total current liabilities	846.8	1,032.2
Convertible senior notes, net	508.2	0.0
Long-term deferred revenue	536.9	289.8
Other long-term liabilities	79.4	67.4
Commitments and contingencies (Note 8)
Temporary equity	0.0	87.9
Stockholders’ equity:
Preferred stock; $0.0001 par value; 100.0 shares authorized; none issued and outstanding at July 31, 2016 and July 31, 2015	0.0	0.0
Common stock and additional paid-in capital; $0.0001 par value; 1,000.0 shares authorized; 90.5 and 84.8 shares issued and outstanding at July 31, 2016 and July 31, 2015, respectively	1,515.5	988.7
Accumulated other comprehensive income (loss)	1.0	(0.1)
Accumulated deficit	(726.6)	(500.7)
Total stockholders’ equity	789.9	487.9
Total liabilities, temporary equity, and stockholders’ equity	$ 2,761.2	$ 1,965.2

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Current assets:
Allowance for doubtful accounts	$ 2.4	$ 0.7
Stockholders’ equity:
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100.0	100.0
Preferred stock, shares issued (in shares)	0.0	0.0
Preferred stock, shares outstanding (in shares)	0.0	0.0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000.0	1,000.0
Common Stock, Shares, Issued (in shares)	90.5	84.8
Common Stock, Shares, Outstanding (in shares)	90.5	84.8

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenue:
Product	$ 670.8	$ 492.7	$ 340.1
Services	707.7	435.4	258.1
Total revenue	1,378.5	928.1	598.2
Cost of revenue:
Product	175.4	131.1	85.5
Services	194.6	120.4	74.1
Total cost of revenue	370.0	251.5	159.6
Total gross profit	1,008.5	676.6	438.6
Operating expenses:
Research and development	284.2	185.8	104.8
Sales and marketing	776.0	522.7	334.8
General and administrative	138.4	101.6	73.1
Legal settlement (Note 9)	0.0	0.0	141.2
Total operating expenses	1,198.6	810.1	653.9
Operating loss	(190.1)	(133.5)	(215.3)
Interest expense	(23.4)	(22.3)	(1.9)
Other income (expense), net	8.4	0.2	(5.0)
Loss before income taxes	(205.1)	(155.6)	(222.2)
Provision for income taxes	20.8	9.4	4.3
Net loss	$ (225.9)	$ (165.0)	$ (226.5)
Net loss per share, basic and diluted	$ (2.59)	$ (2.02)	$ (3.05)
Weighted-average shares used to compute net loss per share, basic and diluted	87.1	81.6	74.3

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Net loss	$ (225.9)	$ (165.0)	$ (226.5)
Other comprehensive income (loss), net of tax:
Change in unrealized gains (losses) on investments	1.1	0.0	(0.1)
Comprehensive loss	$ (224.8)	$ (165.0)	$ (226.6)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock and Additional Paid-In Capital	Common Stock and Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Common stock, beginning balance (in shares) at Jul. 31, 2013		71.6
Beginning balance at Jul. 31, 2013	$ 272.4		$ 381.6	$ 0.0	$ (109.2)
Increase (Decrease) in Stockholders' Equity
Net loss	(226.5)				(226.5)
Other comprehensive income (loss)	(0.1)			(0.1)
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit (in shares)		4.8
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit	48.0		48.0
Share-based compensation for equity based awards	99.8		99.8
Issuance of common stock in connection with legal settlement (in shares)		1.5
Issuance of common stock in connection with legal settlement	113.3		113.3
Issuance of common stock in connection with acquisition (in shares)		1.6
Issuance of common stock in connection with acquisition	87.5		87.5
Equity component of convertible senior notes, net	106.9		106.9
Purchase of convertible senior note hedges	(111.0)		(111.0)
Issuance of warrants	78.3		78.3
Common stock, ending balance (in shares) at Jul. 31, 2014		79.5
Ending balance at Jul. 31, 2014	468.6		804.4	(0.1)	(335.7)
Increase (Decrease) in Stockholders' Equity
Net loss	(165.0)				(165.0)
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit (in shares)		5.3
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit	50.9		50.9
Share-based compensation for equity based awards	221.3		221.3
Temporary equity reclassification	$ (87.9)		(87.9)
Common stock, ending balance (in shares) at Jul. 31, 2015	84.8	84.8
Ending balance at Jul. 31, 2015	$ 487.9		988.7	(0.1)	(500.7)
Increase (Decrease) in Stockholders' Equity
Net loss	(225.9)				(225.9)
Other comprehensive income (loss)	1.1			1.1
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit (in shares)		5.7
Issuance of common stock in connection with employee equity incentive plans and related excess tax benefit	45.8		45.8
Share-based compensation for equity based awards	393.1		393.1
Temporary equity reclassification	$ (87.9)		(87.9)
Common stock, ending balance (in shares) at Jul. 31, 2016	90.5	90.5
Ending balance at Jul. 31, 2016	$ 789.9		$ 1,515.5	$ 1.0	$ (726.6)

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Cash flows from operating activities
Net loss	$ (225.9)	$ (165.0)	$ (226.5)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation for equity based awards	392.8	221.3	99.8
Issuance of common stock for legal settlement	0.0	0.0	46.2
Depreciation and amortization	42.8	28.9	19.4
Amortization of investment premiums, net of accretion of purchase discounts	3.0	3.2	1.5
Amortization of debt discount and debt issuance costs	23.4	22.3	1.8
Change in fair value of common stock warrant	0.0	0.0	5.9
Excess tax benefit from share-based compensation arrangements	(0.5)	(2.5)	(1.0)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	(136.4)	(76.8)	(47.9)
Prepaid expenses and other assets	2.6	(34.2)	(10.3)
Accounts payable	15.1	(3.5)	(1.1)
Accrued compensation	(6.3)	31.1	26.3
Accrued and other liabilities	20.4	34.5	1.1
Deferred revenue	527.1	291.0	173.2
Net cash provided by operating activities	658.1	350.3	88.4
Cash flows from investing activities
Purchases of investments	(1,037.0)	(987.6)	(506.6)
Proceeds from sales of investments	141.9	18.5	74.6
Proceeds from maturities of investments	628.7	339.0	233.5
Business acquisitions, net of cash acquired	0.0	(15.1)	(85.7)
Purchases of property, equipment, and other assets	(72.5)	(33.8)	(36.1)
Net cash used in investing activities	(338.9)	(679.0)	(320.3)
Cash flows from financing activities
Proceeds from borrowings on convertible senior notes, net	0.0	0.0	560.4
Proceeds from issuance of warrants	0.0	0.0	78.3
Purchase of convertible note hedges	0.0	0.0	(111.0)
Proceeds from sales of shares through employee equity incentive plans	45.3	48.2	46.4
Excess tax benefit from share-based compensation arrangements	0.5	2.5	1.0
Payment of deferred consideration related to prior year business acquisition	(6.4)	0.0	0.0
Net cash provided by financing activities	39.4	50.7	575.1
Net increase (decrease) in cash and cash equivalents	358.6	(278.0)	343.2
Cash and cash equivalents—beginning of period	375.8	653.8	310.6
Cash and cash equivalents—end of period	734.4	375.8	653.8
Supplemental disclosures of cash flow information
Cash paid for income taxes	7.1	17.5	1.5
Cash paid for interest	0.0	0.1	0.0
Non-cash investing and financing activities
Issuance of common stock in connection with acquisition	$ 0.0	$ 0.0	$ 87.5

Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Jul. 31, 2016

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 applications running on their networks and by preventing breaches 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 distributors representing various geographical locations. We perform ongoing credit evaluations 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, 2016, four distributors represented 26.1%, 25.6%, 11.4%, and 11.0% of our gross accounts receivable. For fiscal 2016, two distributors represented 31.0% and 27.2% 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 (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, 2016 and 2015, 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, 2016, 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, 2016, 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 $6.6 million, $4.8 million, and $3.7 million, during the years ended July 31, 2016, 2015, and 2014, respectively.

Software Development Costs

Internally developed software includes security software developed to meet our internal needs to provide cloud-based subscription services to our end-customers and business software that we customize to meet our specific operational needs. These capitalized costs consist of internal compensation related costs and external direct costs incurred during the application development stage 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 August 2016, the Financial Accounting Standards Board (“FASB”) issued new authoritative guidance addressing eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain transactions are presented and classified in the statement of cash flows. The standard is effective for us for our first quarter of fiscal 2019 and will be applied on a retrospective basis. Early adoption is permitted. We are currently evaluating whether this standard will have a material impact on our consolidated financial statements.

In June 2016, the FASB issued new authoritative guidance on the accounting for credit losses on most financial assets and certain financial instruments. The standard replaces the existing incurred loss model with an expected credit loss model for financial assets measured at amortized cost, including trade receivables, and requires that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The standard is effective for us for our first quarter of fiscal 2021 and will be applied on a modified-retrospective basis. Early adoption is permitted beginning our first quarter of fiscal 2020. We are currently evaluating whether this standard will have a material impact on our consolidated financial statements.

In March 2016, the FASB issued authoritative guidance simplifying several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, accounting for forfeitures, and classification of excess tax benefits on the statement of cash flows. The standard is effective for us for our first quarter of fiscal 2018, however, early adoption is permitted. We are currently evaluating whether this standard will have a material impact on our consolidated financial statements.

In February 2016, the FASB issued new authoritative guidance on lease accounting. Among its provisions, the standard requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet for operating leases and also requires additional qualitative and quantitative disclosures about lease arrangements. The standard is effective for us for our first quarter of fiscal 2020 and will be applied on a modified retrospective basis, with the option to elect certain practical expedients. Early adoption is permitted. We are currently evaluating whether this standard will have a material impact on our consolidated financial statements.

In April 2015, the 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 and will be applied on a prospective basis. We do not expect the adoption of the 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 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. The FASB subsequently delayed the effective date of the standard by one year and as a result, the standard 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.

Fair Value Measurements

12 Months Ended

Jul. 31, 2016

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, 2016 and July 31, 2015 (in millions):



	July 31, 2016								July 31, 2015
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Short-term investments:
Certificates of deposit	$	—	$	—	$	—	$	—	$	—	$	1.0	$	—	$	1.0
Commercial paper	—		3.0		—		3.0		—		—		—		—
Corporate debt securities	—		121.4		—		121.4		—		97.8		—		97.8
U.S. government and agency securities	—		426.8		—		426.8		—		314.4		—		314.4
Total short-term investments	—		551.2		—		551.2		—		413.2		—		413.2
Long-term investments:
Certificates of deposit	—		5.4		—		5.4		—		—		—		—
Corporate debt securities	—		166.1		—		166.1		—		92.9		—		92.9
U.S. government and agency securities	—		481.3		—		481.3		—		445.9		—		445.9
Total long-term investments	—		652.8		—		652.8		—		538.8		—		538.8
Total assets measured at fair value	$	—	$	1,204.0	$	—	$	1,204.0	$	—	$	952.0	$	—	$	952.0

Refer to Note 7. Convertible Senior Notes for the carrying amount and estimated fair value of our convertible senior notes as of July 31, 2016 and 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, 2016

Investments, Debt and Equity Securities [Abstract]

Investments

The following tables summarize the amortized cost, unrealized gains and losses, and fair value of our available-for-sale investments as of July 31, 2016 and July 31, 2015 (in millions):



	July 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	5.4	$	—	$	—		$	5.4
Commercial paper	3.0		—		—			3.0
Corporate debt securities	286.7		0.8		—			287.5
U.S. government and agency securities	907.3		0.9		(0.1		)	908.1
Total	$	1,202.4	$	1.7	$	(0.1	)	$	1,204.0



	July 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1.0	$	—	$	—		$	1.0
Corporate debt securities	190.9		—		(0.2		)	190.7
U.S. government and agency securities	760.2		0.3		(0.2		)	760.3
Total	$	952.1	$	0.3	$	(0.4	)	$	952.0

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 were no other-than-temporary impairments for these investments at July 31, 2016 and 2015.

We received proceeds of $141.9 million, $18.5 million, and $74.6 million from sales of investments during the years ended July 31, 2016, 2015, and 2014, 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 available-for-sale investments as of July 31, 2016, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	551.0	$	551.2
Due between one and three years	651.4		652.8
Total	$	1,202.4	$	1,204.0

- Definition

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

+ References + Details

Acquisitions

12 Months Ended

Jul. 31, 2016

Business Combinations [Abstract]

Acquisitions

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 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 is being 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.

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



	Amount
Cash	$	90.1
Common stock (1.3 million shares)	87.5
Total	$	177.6

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 is being 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.

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



	Amount
Cash	$	6.9
Goodwill	145.3
Identified intangible assets	42.3
Accrued and other liabilities, net	(7.0		)
Long-term deferred tax liability, net	(9.9		)
Total	$	177.6

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



	Fair Value		Estimated Useful Life
Developed technology	$	34.5	7 years
In-process research and development	7.6		N/A
Other	0.2		2 years
Total	$	42.3

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.

Morta Security, Inc.

On December 26, 2013, we completed our acquisition of Morta Security, Inc. (“Morta”), a privately-held cybersecurity company. We 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 millions):



	Amount
Goodwill	$	10.1
Identified intangible assets	2.2
Net liabilities assumed	(2.0		)
Total	$	10.3

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



	Fair Value		Estimated Useful Life
In-process research and development held for defensive purposes	$	1.9	3 years
Other	0.3		2 years
Total	$	2.2

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
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1524-128463

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7000-128479

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4922-128472

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=73530397&loc=SL65897772-128472

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1383-128463

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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+ Details

Intangible Assets

12 Months Ended

Jul. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

The following table presents details of our purchased intangible assets as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016							2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	53.1	$	(15.4	)	$	37.7	$	53.1	$	(7.7	)	$	45.4
Acquired intellectual property	8.9		(2.9		)	6.0		8.2		(1.9		)	6.3
In-process research and development held for defensive purposes	1.9		(1.6		)	0.3		1.9		(1.0		)	0.9
Other	0.5		(0.5		)	—		0.5		(0.4		)	0.1
Total purchased intangible assets	$	64.4	$	(20.4	)	$	44.0	$	63.7	$	(11.0	)	$	52.7

We recognized amortization expense of $9.4 million, $7.9 million, and $2.9 million for the years ended July 31, 2016, 2015, and 2014, respectively.

The following table summarizes our estimated future amortization expense of intangible assets as of July 31, 2016 (in millions):



	Amount
Years ending July 31:
2017	$	8.7
2018	8.3
2019	8.2
2020	8.1
2021	6.5
2022 and thereafter	4.2
Total future amortization expense	$	44.0

- 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, 2016

Property, Plant and Equipment [Abstract]

Property and Equipment

The following table presents details of our property and equipment, net as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016			2015
Computers, equipment, and software	$	102.7		$	62.6
Leasehold improvements	58.0			25.5
Demonstration units	20.1			16.0
Furniture and fixtures	14.6			6.6
Total property and equipment	195.4			110.7
Less: accumulated depreciation	(78.2		)	(47.8		)
Total property and equipment, net	$	117.2		$	62.9

We recognized depreciation expense of $33.1 million, $20.3 million, and $14.0 million related to property and equipment during the years ended July 31, 2016, 2015, and 2014, respectively.

Convertible Senior Notes

12 Months Ended

Jul. 31, 2016

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 (the “sale price condition”);


•	during the five business day period after any five consecutive trading day 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.

The sale price condition was met during the fiscal quarter ended July 31, 2015, and as a result, holders could convert their Notes at any time during the fiscal quarter ending October 31, 2015. Accordingly, the net carrying amount of the Notes and related debit issuance costs were classified in current liabilities and current assets, respectively, and a portion of the equity component representing the conversion option was classified as temporary equity in our consolidated balance sheets as of July 31, 2015. The portion of the equity component classified as temporary equity was measured as the difference between the principal and net carrying amount of the Notes. The sale price condition was not met during the fiscal quarter ended July 31, 2016. Since the Notes were no longer convertible, the net carrying amount of the Notes and related debt issuance costs were reclassified into long-term liabilities and other assets, respectively, in our consolidated balance sheets as of July 31, 2016. In addition, the portion of the equity component classified as temporary equity was reclassified into additional paid-in capital in our consolidated balance sheets as of July 31, 2016.

The following table sets forth the components of the Notes as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016		2015
Liability:
Principal	$	575.0	$	575.0
Less: debt discount, net of amortization	66.8		87.9
Net carrying amount	$	508.2	$	487.1

Equity (including temporary equity)	$	109.8	$	109.8

The total estimated fair value of the Notes was $761.9 million and $994.8 million at July 31, 2016 and July 31, 2015, 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, 2016 and July 31, 2015 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, 2016, the if-converted value of the Notes exceeded its principal amount by $80.0 million.

The following table sets forth interest expense recognized related to the Notes (dollars in millions):



	Year Ended July 31,
	2016			2015			2014
Amortization of debt discount	$	21.1		$	20.2		$	1.6
Amortization of debt issuance costs	2.3			2.1			0.2
Total interest expense recognized	$	23.4		$	22.3		$	1.8

Effective interest rate of the liability component	4.8		%	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 transactions whereby we sold warrants (the “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, 2016

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 five-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.

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. In October 2015, we entered into a fourth lease agreement for approximately 310,000 square feet of additional office space at the same location. The first lease commenced in February 2016 and will expire in April 2021. The remaining three leases will commence between May 2017 and December 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 four lease agreements are approximately $376.7 million over the lease term.

We recognized rent expense of $20.2 million, $15.4 million, and $13.2 million for the years ended July 31, 2016, 2015, and 2014, 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, 2016 (in millions):



	Amount
Years ending July 31:
2017	$	27.3
2018	33.3
2019	46.2
2020	49.8
2021	54.1
2022 and thereafter	298.6
Committed gross lease payments	509.3
Less: proceeds from sublease rental	5.1
Net operating lease obligation	$	504.2

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 12 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. As of July 31, 2016, our purchase commitments under such orders were $54.2 million, excluding obligations under contracts that we can cancel without a significant penalty.

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, 2016, 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 payments made to us for the alleged infringing products over the preceding twelve months under the agreement. However, certain agreements include indemnification provisions that could potentially expose us to losses in excess of these payments. In addition, we indemnify our officers, directors, and certain key employees while they are serving in good faith in their company capacities. To date, we have not recorded any accruals for loss contingencies associated with indemnification claims or determined that an unfavorable outcome is probable or reasonably possible.

Legal Settlement

12 Months Ended

Jul. 31, 2016

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, $75.3 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.

Equity Award Plans

12 Months Ended

Jul. 31, 2016

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 (“RSAs”), 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 from the date of grant, and our options expire no more than ten years after the date of grant. Since our IPO in 2012, awards granted under our 2012 Plan consist primarily of RSUs. 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 16.8 million shares of our common stock are reserved for issuance pursuant to our 2012 Plan as of July 31, 2016. 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 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. During the year ended July 31, 2016, employees purchased 0.2 million shares of common stock under our 2012 ESPP at an average exercise price of $126.96 per share.

A total of 2.4 million shares of our common stock are available for sale under our 2012 ESPP as of July 31, 2016. 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

The following table summarizes the stock option activity under our stock plans during the reporting period (in millions, 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, 2015	3.3		$	13.74	6.2	$	562.9
Options granted	—		—
Options forfeited	—		—
Options exercised	(1.2	)	14.21
Balance—July 31, 2016	2.1		$	13.42	5.2	$	244.9
Options vested and expected to vest—July 31, 2016	2.1		$	13.42	5.2	$	244.9
Options exercisable—July 31, 2016	2.1		$	13.42	5.2	$	244.9

The intrinsic value of options exercised during the years ended July 31, 2016, 2015, and 2014 was $176.1 million, $301.1 million, and $198.8 million, respectively. The grant-date fair value of options vested during the years ended July 31, 2016, 2015, and 2014 was $8.1 million, $14.6 million, and $17.1 million, respectively.

Restricted Stock Unit (“RSU”) and Restricted Stock Award (“RSA”) Activities

The following table summarizes the RSU and RSA activity under our stock plans during the reporting period (in millions, except per share amounts):



	RSAs Outstanding			RSUs Outstanding
	Number of Shares	Weighted- Average Grant-Date Fair Value Per Share		Number of Shares		Weighted- Average Grant-Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2015	—	$	—	7.2		$	95.66	1.2	$	1,334.8
Granted	1.1	170.97		3.2		160.60
Vested	—	—		(3.3	)	89.76
Forfeited	—	—		(0.6	)	104.08
Balance—July 31, 2016	1.1	$	170.97	6.5		$	130.14	1.1	$	852.7
Expected to vest—July 31, 2016	1.0	$	170.97	6.2		$	129.64	1.1	$	810.0

The weighted-average grant-date fair value of RSUs granted during the years ended July 31, 2016, 2015, and 2014 was $160.60, $122.36, and $61.00 per share, respectively. The aggregate fair value, as of the respective vesting dates, of RSUs vested during the years ended July 31, 2016, 2015, and 2014 was $513.0 million, $350.4 million, and $57.4 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, 2016 (in millions):



	Number of shares
Balance—July 31, 2015	8.1
Authorized	3.8
RSUs and RSAs granted	(4.3	)
RSUs forfeited	0.6
Balance—July 31, 2016	8.2

Share-Based Compensation

We record share-based compensation awards based on estimated fair value as of the grant date. The fair value of RSUs and RSAs is based on the closing market price of our common stock on the date of grant. The fair value of shares sold through our 2012 ESPP are estimated on the grant date using the Black-Scholes option pricing model.

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



	Year Ended July 31,
	2016		2015		2014
Cost of product revenue	$	6.2	$	3.9	$	1.6
Cost of services revenue	40.9		20.4		9.4
Research and development	132.9		74.8		29.5
Sales and marketing	152.4		84.1		42.6
General and administrative	60.5		38.2		16.8
Total share-based compensation	$	392.9	$	221.4	$	99.9

During the year ended July 31, 2014, we accelerated the vesting of certain share-based awards in connection with our acquisitions of Cyvera and Morta and as a result, we recorded $3.4 million of compensation expense within general and administrative expense. At July 31, 2016, total compensation cost related to unvested share-based awards not yet recognized was $822.9 million, net of estimated forfeitures. This cost is expected to be amortized on a straight-line basis over a weighted-average period of approximately 2.4 years. Future grants will increase the amount of compensation expense to be recorded in these periods.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Income Taxes

12 Months Ended

Jul. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

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



	Year Ended July 31,
	2016			2015			2014
United States	$	(216.2	)	$	(47.5	)	$	(149.3	)
Foreign	11.1			(108.1		)	(72.9		)
Total	$	(205.1	)	$	(155.6	)	$	(222.2	)

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



	Year Ended July 31,
	2016			2015			2014
Federal:
Current	$	1.9		$	1.8		$	0.8
Deferred	(0.6		)	(3.0		)	—
State:
Current	1.1			0.7			0.2
Deferred	(0.1		)	(0.4		)	(0.3		)
Foreign:
Current	19.1			10.7			4.7
Deferred	(0.6		)	(0.4		)	(1.1		)
Total	$	20.8		$	9.4		$	4.3

For the year ended July 31, 2016, our provision for income taxes increased compared to the year ended July 31, 2015 primarily due to an increase in foreign taxes and amortization of our deferred tax charges.

For the year ended July 31, 2015, 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.

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,
	2016		2015		2014
Federal statutory rate	35.0	%	35.0	%	35.0	%
Effect of:
State taxes, net of federal tax benefit	(1.5	)	3.6		1.3
Foreign income at other than U.S. rates	(8.8	)	(6.5	)	(12.1	)
Change in valuation allowance	(24.9	)	(28.5	)	(21.3	)
Share-based compensation	(13.3	)	(10.2	)	(3.2	)
Amortization of deferred tax charges	(2.8	)	(2.2	)	—
Research credits	9.5		6.7		1.3
Other, net	(3.4	)	(3.9	)	(2.9	)
Total	(10.2	)%	(6.0	)%	(1.9	)%

During the year ended July 31, 2016, we accounted for the outcome of The Gillette Company et al. v. California Franchise Tax Board which disallowed the election to use an evenly weighted, three factor apportionment formula utilized by us on our tax return for the year ended July 31, 2014. The impact for the change in apportionment is reflected in state taxes, net of federal tax benefit above and is fully offset by changes in our valuation allowance.

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, 2016 and July 31, 2015 (in millions):



	July 31,
	2016			2015
Deferred tax assets:
Accruals and reserves	$	43.5		$	38.9
Deferred revenue	62.0			35.3
Research and development and foreign tax credits	41.4			20.1
Net operating loss carryforwards	5.4			18.4
Share-based compensation	55.2			35.9
Gross deferred tax assets	207.5			148.6
Valuation allowance	(189.4		)	(138.4		)
Total deferred tax assets	18.1			10.2
Deferred tax liabilities:
Fixed assets and intangible assets	(14.2		)	(7.9		)
Other deferred tax liabilities	(2.5		)	(1.6		)
Total deferred tax liabilities	(16.7		)	(9.5		)
Total	$	1.4		$	0.7

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, 2016, we have provided a valuation allowance for our federal and state deferred tax assets that we believe will, more likely than not, be unrealizable. The net valuation allowance increased by approximately $51.0 million from the year ended July 31, 2015 to the year ended July 31, 2016, which was primarily attributable to an increase in deferred tax assets in our federal and state jurisdictions.

As of July 31, 2016, we had federal, state, and foreign NOL carryforwards of approximately $1.1 billion, $823.8 million, and $8.9 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 at various dates beginning in the years ending July 31, 2027 and July 31, 2017, respectively. Our foreign NOL will carry forward indefinitely.

As of July 31, 2016, we had federal and state research and development tax credit carryforwards of approximately $37.1 million and $37.2 million, respectively as reported on our tax returns. If not utilized, the federal credit carryforwards will expire in various amounts at various dates beginning in the year ending July 31, 2026. The state credit will carry forward indefinitely.

As of July 31, 2016, we had foreign tax credit carryforwards of $1.7 million as reported on our tax returns. If not utilized, the foreign tax credit carryforwards will expire in various amounts at various dates beginning in the year ending July 31, 2021.

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, 2016, we had excess tax benefits from share-based awards of $1.0 billion, $669.7 million, and $8.9 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, 2016, 2015, and 2014, 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 $0.5 million, $2.5 million, and $1.0 million, respectively.

In December 2015, the Protecting Americans from Tax Hikes Act of 2015 (the “PATH Act”) was signed into law. Among its provisions, the PATH Act retroactively extends the bonus depreciation and other corporate tax incentives through December 31, 2019, and permanently extends the federal research and development credit. 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, 2016 as a result of the legislation.

As of July 31, 2016, we had $127.7 million of unrecognized tax benefits, $21.9 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, 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. As of July 31, 2016, our federal, state, and foreign returns for the tax years 2008 through the current period remain subject to adjustment due 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, 2016 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, 2016, 2015, and 2014, we recognized income tax expense related to interest and penalties of $1.6 million, $1.1 million, and $0.3 million, respectively. We had accrued interest and penalties on our consolidated balance sheets related to unrecognized tax benefits of $3.3 million and $1.8 million as of July 31, 2016 and 2015, 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 millions):



	Year Ended July 31,
	2016		2015			2014
Unrecognized tax benefits at the beginning of the period	$	67.2	$	10.4		$	6.6
Additions for tax positions taken in prior years	25.2		6.1			0.4
Reductions for tax positions taken in prior years	—		(0.6		)	—
Additions for tax positions taken in the current year	35.3		51.3			3.4
Unrecognized tax benefits at the end of the period	$	127.7	$	67.2		$	10.4

During the year ended July 31, 2016, our additions for tax positions taken in prior years and additions for tax positions taken in the current year were primarily attributable to uncertain tax positions relating to federal and state research and development credits, adjustments for California apportionment, and transfer pricing methodologies.

As of July 31, 2016, we had approximately $9.7 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, 2016

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 millions, except per share data):



	Year Ended July 31,
	2016			2015			2014
Net loss	$	(225.9	)	$	(165.0	)	$	(226.5	)
Weighted-average shares used to compute net loss per share, basic and diluted	87.1			81.6			74.3
Net loss per share, basic and diluted	$	(2.59	)	$	(2.02	)	$	(3.05	)

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 millions):



	Year Ended July 31,
	2016	2015	2014
RSUs	6.5	7.2	6.0
Convertible senior notes	5.2	5.2	5.2
Warrants related to the issuance of convertible senior notes	5.2	5.2	5.2
Options to purchase common stock	2.1	3.3	5.8
RSAs	1.1	—	—
ESPP shares	0.1	0.1	0.1
Total	20.2	21.0	22.3

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Jul. 31, 2016
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. In fiscal 2016, we began to make matching contributions based upon the amount of employees’ contributions, subject to certain limitations. Our matching contributions to the plan were immaterial for the year ended July 31, 2016.

Segment Information

12 Months Ended

Jul. 31, 2016

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 millions):



	Year Ended July 31,
	2016		2015		2014
Revenue:
Americas
United States	$	901.8	$	593.8	$	363.2
Other Americas	71.4		45.6		33.5
Total Americas	973.2		639.4		396.7
Europe, the Middle East, and Africa (“EMEA”)	247.1		178.7		126.9
Asia Pacific and Japan (“APAC”)	158.2		110.0		74.6
Total revenue	$	1,378.5	$	928.1	$	598.2

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



	Year Ended July 31,
	2016		2015		2014
Revenue:
Product	$	670.8	$	492.7	$	340.1
Services
Subscription	357.0		212.7		123.2
Support and maintenance	350.7		222.7		134.9
Total services	707.7		435.4		258.1
Total revenue	$	1,378.5	$	928.1	$	598.2

Substantially all of our assets were attributable to our U.S. operations as of July 31, 2016 and 2015.

- 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=68060357&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=68060357&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=68060357&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=68060357&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=68060357&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=68060357&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=68060357&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=68060357&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=68060357&loc=d3e8906-108599

+ Details

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Jul. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

The following tables set forth selected unaudited quarterly financial data for the years ended July 31, 2016 and 2015 (in millions, except per share amounts):



	Three Months Ended
	Oct. 31, 2015			Jan. 31, 2016			Apr. 30, 2016			Jul. 31, 2016
Revenue:
Product	$	147.7		$	169.9		$	162.1		$	191.1
Services	149.5			164.8			183.7			209.7
Total revenue	297.2			334.7			345.8			400.8
Cost of revenue:
Product	38.8			44.9			43.2			48.5
Services	40.4			49.3			51.7			53.2
Total cost of revenue	79.2			94.2			94.9			101.7
Total gross profit	218.0			240.5			250.9			299.1
Operating expenses:
Research and development	59.7			74.0			74.0			76.5
Sales and marketing	158.3			187.6			202.0			228.1
General and administrative	30.8			34.2			33.5			39.9
Total operating expenses	248.8			295.8			309.5			344.5
Operating loss	(30.8		)	(55.3		)	(58.6		)	(45.4		)
Interest expense	(5.8		)	(5.8		)	(5.8		)	(6.0		)
Other income, net	2.2			2.5			1.0			2.7
Loss before income taxes	(34.4		)	(58.6		)	(63.4		)	(48.7		)
Provision for income taxes	4.3			3.9			6.8			5.8
Net loss	$	(38.7	)	$	(62.5	)	$	(70.2	)	$	(54.5	)
Net loss per share, basic and diluted	$	(0.45	)	$	(0.72	)	$	(0.80	)	$	(0.61	)



	Three Months Ended
	Oct. 31, 2014			Jan. 31, 2015			Apr. 30, 2015			Jul. 31, 2015
Revenue:
Product	$	101.5		$	115.6		$	121.5		$	154.1
Services	90.8			102.1			112.7			129.8
Total revenue	192.3			217.7			234.2			283.9
Cost of revenue:
Product	29.1			30.7			32.8			38.5
Services	24.3			28.7			31.6			35.8
Total cost of revenue	53.4			59.4			64.4			74.3
Total gross profit	138.9			158.3			169.8			209.6
Operating expenses:
Research and development	37.3			47.0			48.4			53.1
Sales and marketing	106.4			122.8			131.1			162.4
General and administrative	19.0			27.0			27.0			28.6
Total operating expenses	162.7			196.8			206.5			244.1
Operating loss	(23.8		)	(38.5		)	(36.7		)	(34.5		)
Interest expense	(5.5		)	(5.5		)	(5.7		)	(5.6		)
Other income (expense), net	0.4			0.3			—			(0.5		)
Loss before income taxes	(28.9		)	(43.7		)	(42.4		)	(40.6		)
Provision for (benefit from) income taxes	1.2			(0.7		)	3.5			5.4
Net loss	$	(30.1	)	$	(43.0	)	$	(45.9	)	$	(46.0	)
Net loss per share, basic and diluted	$	(0.38	)	$	(0.53	)	$	(0.56	)	$	(0.55	)

Subsequent Events	12 Months Ended
Subsequent Events	Jul. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Share Repurchase On August 26, 2016, our board of directors authorized a $500.0 million share repurchase which will be funded from available working capital. Repurchases may be made at management’s discretion from time to time on the open market, through privately negotiated transactions, transactions structured through investment banking institutions, block purchase techniques, 10b5-1 trading plans, or a combination of the foregoing. The repurchase authorization will expire on August 31, 2018, and may be suspended or discontinued at any time. Hedging On August 30, 2016, we entered into forward contracts with a notional amount of €66.9 million to hedge the foreign currency exposure related to our euro-denominated expenditures for the fiscal year ending July 31, 2017. These forward contracts have been designated as hedging instruments for hedge accounting purposes.

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

12 Months Ended

Jul. 31, 2016

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

Concentrations

Financial instruments that subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments, and accounts receivable.

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 (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, 2016

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, 2016 and July 31, 2015 (in millions):



	July 31, 2016								July 31, 2015
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Short-term investments:
Certificates of deposit	$	—	$	—	$	—	$	—	$	—	$	1.0	$	—	$	1.0
Commercial paper	—		3.0		—		3.0		—		—		—		—
Corporate debt securities	—		121.4		—		121.4		—		97.8		—		97.8
U.S. government and agency securities	—		426.8		—		426.8		—		314.4		—		314.4
Total short-term investments	—		551.2		—		551.2		—		413.2		—		413.2
Long-term investments:
Certificates of deposit	—		5.4		—		5.4		—		—		—		—
Corporate debt securities	—		166.1		—		166.1		—		92.9		—		92.9
U.S. government and agency securities	—		481.3		—		481.3		—		445.9		—		445.9
Total long-term investments	—		652.8		—		652.8		—		538.8		—		538.8
Total assets measured at fair value	$	—	$	1,204.0	$	—	$	1,204.0	$	—	$	952.0	$	—	$	952.0

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Investments (Tables)

12 Months Ended

Jul. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale investments

The following tables summarize the amortized cost, unrealized gains and losses, and fair value of our available-for-sale investments as of July 31, 2016 and July 31, 2015 (in millions):



	July 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	5.4	$	—	$	—		$	5.4
Commercial paper	3.0		—		—			3.0
Corporate debt securities	286.7		0.8		—			287.5
U.S. government and agency securities	907.3		0.9		(0.1		)	908.1
Total	$	1,202.4	$	1.7	$	(0.1	)	$	1,204.0



	July 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1.0	$	—	$	—		$	1.0
Corporate debt securities	190.9		—		(0.2		)	190.7
U.S. government and agency securities	760.2		0.3		(0.2		)	760.3
Total	$	952.1	$	0.3	$	(0.4	)	$	952.0

Contractual maturities of available-for-sale investments

The following table summarizes the amortized cost and fair value of our available-for-sale investments as of July 31, 2016, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	551.0	$	551.2
Due between one and three years	651.4		652.8
Total	$	1,202.4	$	1,204.0

- 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, 2016

Cyvera Ltd.

Business Acquisition

Schedule of consideration

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



	Amount
Cash	$	90.1
Common stock (1.3 million shares)	87.5
Total	$	177.6

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 millions):



	Amount
Cash	$	6.9
Goodwill	145.3
Identified intangible assets	42.3
Accrued and other liabilities, net	(7.0		)
Long-term deferred tax liability, net	(9.9		)
Total	$	177.6

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 millions, except years):



	Fair Value		Estimated Useful Life
Developed technology	$	34.5	7 years
In-process research and development	7.6		N/A
Other	0.2		2 years
Total	$	42.3

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 millions):



	Amount
Goodwill	$	10.1
Identified intangible assets	2.2
Net liabilities assumed	(2.0		)
Total	$	10.3

Schedule of finite-lived intangible assets acquired as part of business combination

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



	Fair Value		Estimated Useful Life
In-process research and development held for defensive purposes	$	1.9	3 years
Other	0.3		2 years
Total	$	2.2

Intangible Assets (Tables)

12 Months Ended

Jul. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of intangible assets

The following table presents details of our purchased intangible assets as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016							2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	53.1	$	(15.4	)	$	37.7	$	53.1	$	(7.7	)	$	45.4
Acquired intellectual property	8.9		(2.9		)	6.0		8.2		(1.9		)	6.3
In-process research and development held for defensive purposes	1.9		(1.6		)	0.3		1.9		(1.0		)	0.9
Other	0.5		(0.5		)	—		0.5		(0.4		)	0.1
Total purchased intangible assets	$	64.4	$	(20.4	)	$	44.0	$	63.7	$	(11.0	)	$	52.7

Future amortization expense of intangible assets

The following table summarizes our estimated future amortization expense of intangible assets as of July 31, 2016 (in millions):



	Amount
Years ending July 31:
2017	$	8.7
2018	8.3
2019	8.2
2020	8.1
2021	6.5
2022 and thereafter	4.2
Total future amortization expense	$	44.0

Property and Equipment (Tables)

12 Months Ended

Jul. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

The following table presents details of our property and equipment, net as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016			2015
Computers, equipment, and software	$	102.7		$	62.6
Leasehold improvements	58.0			25.5
Demonstration units	20.1			16.0
Furniture and fixtures	14.6			6.6
Total property and equipment	195.4			110.7
Less: accumulated depreciation	(78.2		)	(47.8		)
Total property and equipment, net	$	117.2		$	62.9

Convertible Senior Notes (Tables)

12 Months Ended

Jul. 31, 2016

Debt Disclosure [Abstract]

Components of Convertible Senior Notes

The following table sets forth the components of the Notes as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016		2015
Liability:
Principal	$	575.0	$	575.0
Less: debt discount, net of amortization	66.8		87.9
Net carrying amount	$	508.2	$	487.1

Equity (including temporary equity)	$	109.8	$	109.8

Interest expense recognized related to the Notes

The following table sets forth interest expense recognized related to the Notes (dollars in millions):



	Year Ended July 31,
	2016			2015			2014
Amortization of debt discount	$	21.1		$	20.2		$	1.6
Amortization of debt issuance costs	2.3			2.1			0.2
Total interest expense recognized	$	23.4		$	22.3		$	1.8

Effective interest rate of the liability component	4.8		%	4.8		%	4.8		%

Commitments and Contingencies (Tables)

12 Months Ended

Jul. 31, 2016

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, 2016 (in millions):



	Amount
Years ending July 31:
2017	$	27.3
2018	33.3
2019	46.2
2020	49.8
2021	54.1
2022 and thereafter	298.6
Committed gross lease payments	509.3
Less: proceeds from sublease rental	5.1
Net operating lease obligation	$	504.2

Equity Award Plans (Tables)

12 Months Ended

Jul. 31, 2016

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

Schedule of stock options activity

The following table summarizes the stock option activity under our stock plans during the reporting period (in millions, 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, 2015	3.3		$	13.74	6.2	$	562.9
Options granted	—		—
Options forfeited	—		—
Options exercised	(1.2	)	14.21
Balance—July 31, 2016	2.1		$	13.42	5.2	$	244.9
Options vested and expected to vest—July 31, 2016	2.1		$	13.42	5.2	$	244.9
Options exercisable—July 31, 2016	2.1		$	13.42	5.2	$	244.9

Schedule of Restricted Stock Unit (“RSU”) and Restricted Stock Award (“RSA”) activities

The following table summarizes the RSU and RSA activity under our stock plans during the reporting period (in millions, except per share amounts):



	RSAs Outstanding			RSUs Outstanding
	Number of Shares	Weighted- Average Grant-Date Fair Value Per Share		Number of Shares		Weighted- Average Grant-Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2015	—	$	—	7.2		$	95.66	1.2	$	1,334.8
Granted	1.1	170.97		3.2		160.60
Vested	—	—		(3.3	)	89.76
Forfeited	—	—		(0.6	)	104.08
Balance—July 31, 2016	1.1	$	170.97	6.5		$	130.14	1.1	$	852.7
Expected to vest—July 31, 2016	1.0	$	170.97	6.2		$	129.64	1.1	$	810.0

Shares available for grant

The following table presents the stock activity and the total number of shares available for grant as of July 31, 2016 (in millions):



	Number of shares
Balance—July 31, 2015	8.1
Authorized	3.8
RSUs and RSAs granted	(4.3	)
RSUs forfeited	0.6
Balance—July 31, 2016	8.2

Schedule of allocation of share based compensation expense

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



	Year Ended July 31,
	2016		2015		2014
Cost of product revenue	$	6.2	$	3.9	$	1.6
Cost of services revenue	40.9		20.4		9.4
Research and development	132.9		74.8		29.5
Sales and marketing	152.4		84.1		42.6
General and administrative	60.5		38.2		16.8
Total share-based compensation	$	392.9	$	221.4	$	99.9

Income Taxes (Tables)

12 Months Ended

Jul. 31, 2016

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 millions):



	Year Ended July 31,
	2016			2015			2014
United States	$	(216.2	)	$	(47.5	)	$	(149.3	)
Foreign	11.1			(108.1		)	(72.9		)
Total	$	(205.1	)	$	(155.6	)	$	(222.2	)

Schedule of components of income tax expense (benefit)

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



	Year Ended July 31,
	2016			2015			2014
Federal:
Current	$	1.9		$	1.8		$	0.8
Deferred	(0.6		)	(3.0		)	—
State:
Current	1.1			0.7			0.2
Deferred	(0.1		)	(0.4		)	(0.3		)
Foreign:
Current	19.1			10.7			4.7
Deferred	(0.6		)	(0.4		)	(1.1		)
Total	$	20.8		$	9.4		$	4.3

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,
	2016		2015		2014
Federal statutory rate	35.0	%	35.0	%	35.0	%
Effect of:
State taxes, net of federal tax benefit	(1.5	)	3.6		1.3
Foreign income at other than U.S. rates	(8.8	)	(6.5	)	(12.1	)
Change in valuation allowance	(24.9	)	(28.5	)	(21.3	)
Share-based compensation	(13.3	)	(10.2	)	(3.2	)
Amortization of deferred tax charges	(2.8	)	(2.2	)	—
Research credits	9.5		6.7		1.3
Other, net	(3.4	)	(3.9	)	(2.9	)
Total	(10.2	)%	(6.0	)%	(1.9	)%

Schedule of deferred tax assets and liabilities

The following table presents the components of our deferred tax assets and liabilities as of July 31, 2016 and July 31, 2015 (in millions):



	July 31,
	2016			2015
Deferred tax assets:
Accruals and reserves	$	43.5		$	38.9
Deferred revenue	62.0			35.3
Research and development and foreign tax credits	41.4			20.1
Net operating loss carryforwards	5.4			18.4
Share-based compensation	55.2			35.9
Gross deferred tax assets	207.5			148.6
Valuation allowance	(189.4		)	(138.4		)
Total deferred tax assets	18.1			10.2
Deferred tax liabilities:
Fixed assets and intangible assets	(14.2		)	(7.9		)
Other deferred tax liabilities	(2.5		)	(1.6		)
Total deferred tax liabilities	(16.7		)	(9.5		)
Total	$	1.4		$	0.7

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 millions):



	Year Ended July 31,
	2016		2015			2014
Unrecognized tax benefits at the beginning of the period	$	67.2	$	10.4		$	6.6
Additions for tax positions taken in prior years	25.2		6.1			0.4
Reductions for tax positions taken in prior years	—		(0.6		)	—
Additions for tax positions taken in the current year	35.3		51.3			3.4
Unrecognized tax benefits at the end of the period	$	127.7	$	67.2		$	10.4

Net Income (Loss) Per Share (Tables)

12 Months Ended

Jul. 31, 2016

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 millions, except per share data):



	Year Ended July 31,
	2016			2015			2014
Net loss	$	(225.9	)	$	(165.0	)	$	(226.5	)
Weighted-average shares used to compute net loss per share, basic and diluted	87.1			81.6			74.3
Net loss per share, basic and diluted	$	(2.59	)	$	(2.02	)	$	(3.05	)

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 millions):



	Year Ended July 31,
	2016	2015	2014
RSUs	6.5	7.2	6.0
Convertible senior notes	5.2	5.2	5.2
Warrants related to the issuance of convertible senior notes	5.2	5.2	5.2
Options to purchase common stock	2.1	3.3	5.8
RSAs	1.1	—	—
ESPP shares	0.1	0.1	0.1
Total	20.2	21.0	22.3

Segment Information (Tables)

12 Months Ended

Jul. 31, 2016

Segment Reporting [Abstract]

Revenue from external customers by geographic areas

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



	Year Ended July 31,
	2016		2015		2014
Revenue:
Americas
United States	$	901.8	$	593.8	$	363.2
Other Americas	71.4		45.6		33.5
Total Americas	973.2		639.4		396.7
Europe, the Middle East, and Africa (“EMEA”)	247.1		178.7		126.9
Asia Pacific and Japan (“APAC”)	158.2		110.0		74.6
Total revenue	$	1,378.5	$	928.1	$	598.2

Revenue from external customers by products and services

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



	Year Ended July 31,
	2016		2015		2014
Revenue:
Product	$	670.8	$	492.7	$	340.1
Services
Subscription	357.0		212.7		123.2
Support and maintenance	350.7		222.7		134.9
Total services	707.7		435.4		258.1
Total revenue	$	1,378.5	$	928.1	$	598.2

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Jul. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information

The following tables set forth selected unaudited quarterly financial data for the years ended July 31, 2016 and 2015 (in millions, except per share amounts):



	Three Months Ended
	Oct. 31, 2015			Jan. 31, 2016			Apr. 30, 2016			Jul. 31, 2016
Revenue:
Product	$	147.7		$	169.9		$	162.1		$	191.1
Services	149.5			164.8			183.7			209.7
Total revenue	297.2			334.7			345.8			400.8
Cost of revenue:
Product	38.8			44.9			43.2			48.5
Services	40.4			49.3			51.7			53.2
Total cost of revenue	79.2			94.2			94.9			101.7
Total gross profit	218.0			240.5			250.9			299.1
Operating expenses:
Research and development	59.7			74.0			74.0			76.5
Sales and marketing	158.3			187.6			202.0			228.1
General and administrative	30.8			34.2			33.5			39.9
Total operating expenses	248.8			295.8			309.5			344.5
Operating loss	(30.8		)	(55.3		)	(58.6		)	(45.4		)
Interest expense	(5.8		)	(5.8		)	(5.8		)	(6.0		)
Other income, net	2.2			2.5			1.0			2.7
Loss before income taxes	(34.4		)	(58.6		)	(63.4		)	(48.7		)
Provision for income taxes	4.3			3.9			6.8			5.8
Net loss	$	(38.7	)	$	(62.5	)	$	(70.2	)	$	(54.5	)
Net loss per share, basic and diluted	$	(0.45	)	$	(0.72	)	$	(0.80	)	$	(0.61	)



	Three Months Ended
	Oct. 31, 2014			Jan. 31, 2015			Apr. 30, 2015			Jul. 31, 2015
Revenue:
Product	$	101.5		$	115.6		$	121.5		$	154.1
Services	90.8			102.1			112.7			129.8
Total revenue	192.3			217.7			234.2			283.9
Cost of revenue:
Product	29.1			30.7			32.8			38.5
Services	24.3			28.7			31.6			35.8
Total cost of revenue	53.4			59.4			64.4			74.3
Total gross profit	138.9			158.3			169.8			209.6
Operating expenses:
Research and development	37.3			47.0			48.4			53.1
Sales and marketing	106.4			122.8			131.1			162.4
General and administrative	19.0			27.0			27.0			28.6
Total operating expenses	162.7			196.8			206.5			244.1
Operating loss	(23.8		)	(38.5		)	(36.7		)	(34.5		)
Interest expense	(5.5		)	(5.5		)	(5.7		)	(5.6		)
Other income (expense), net	0.4			0.3			—			(0.5		)
Loss before income taxes	(28.9		)	(43.7		)	(42.4		)	(40.6		)
Provision for (benefit from) income taxes	1.2			(0.7		)	3.5			5.4
Net loss	$	(30.1	)	$	(43.0	)	$	(45.9	)	$	(46.0	)
Net loss per share, basic and diluted	$	(0.38	)	$	(0.53	)	$	(0.56	)	$	(0.55	)

Description of Business and Summary of Significant Accounting Policies (Concentrations) (Details)	12 Months Ended
	Jul. 31, 2016 distributor
Accounts receivable
Concentration Risk
Number of customers	4
Accounts receivable \| Customer A
Concentration Risk
Percentage	25.60%
Accounts receivable \| Customer B
Concentration Risk
Percentage	26.10%
Accounts receivable \| Customer C
Concentration Risk
Percentage	11.40%
Accounts receivable \| Customer D
Concentration Risk
Percentage	11.00%
Revenue
Concentration Risk
Number of customers	2
Revenue \| Customer A
Concentration Risk
Percentage	31.00%
Revenue \| Customer B
Concentration Risk
Percentage	27.20%

Description of Business and Summary of Significant Accounting Policies (Property and Equipment) (Details)	12 Months Ended
	Jul. 31, 2016
Minimum
Property and Equipment
Useful life (in years)	3 years
Maximum
Property and Equipment
Useful life (in years)	10 years

Description of Business and Summary of Significant Accounting Policies (Convertible Senior Notes) (Details) $ in Millions	Jun. 30, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Aggregate principal amount	$ 575.0
Contractual interest rate (in percentage)	0.00%

Description of Business and Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Advertising expense	$ 6.6	$ 4.8	$ 3.7

Description of Business and Summary of Significant Accounting Policies (Software Development Costs) (Details)	12 Months Ended
	Jul. 31, 2016
Minimum
Property and Equipment
Useful life (in years)	3 years
Maximum
Property and Equipment
Useful life (in years)	10 years
Software development costs \| Minimum
Property and Equipment
Useful life (in years)	3 years
Software development costs \| Maximum
Property and Equipment
Useful life (in years)	5 years

Fair Value Measurements (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	$ 551.2	$ 413.2
Long-term investments	652.8	538.8
Total assets measured at fair value	1,204.0	952.0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Total assets measured at fair value	0.0	0.0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	551.2	413.2
Long-term investments	652.8	538.8
Total assets measured at fair value	1,204.0	952.0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Total assets measured at fair value	0.0	0.0
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	1.0
Long-term investments	5.4	0.0
Certificates of deposit \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Certificates of deposit \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	1.0
Long-term investments	5.4	0.0
Certificates of deposit \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	3.0	0.0
Commercial paper \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Commercial paper \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	3.0	0.0
Commercial paper \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	121.4	97.8
Long-term investments	166.1	92.9
Corporate debt securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Corporate debt securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	121.4	97.8
Long-term investments	166.1	92.9
Corporate debt securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	426.8	314.4
Long-term investments	481.3	445.9
U.S. government and agency securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
U.S. government and agency securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	426.8	314.4
Long-term investments	481.3	445.9
U.S. government and agency securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	0.0	0.0
Long-term investments	$ 0.0	$ 0.0

Investments (Available-for-Sale Investments) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Schedule of Available-for-sale Securities
Amortized cost	$ 1,202.4	$ 952.1
Unrealized gains	1.7	0.3
Unrealized losses	(0.1)	(0.4)
Estimated fair value	1,204.0	952.0
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized cost	5.4	1.0
Unrealized gains	0.0	0.0
Unrealized losses	0.0	0.0
Estimated fair value	5.4	1.0
Commercial paper
Schedule of Available-for-sale Securities
Amortized cost	3.0
Unrealized gains	0.0
Unrealized losses	0.0
Estimated fair value	3.0
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized cost	286.7	190.9
Unrealized gains	0.8	0.0
Unrealized losses	0.0	(0.2)
Estimated fair value	287.5	190.7
U.S. government and agency securities
Schedule of Available-for-sale Securities
Amortized cost	907.3	760.2
Unrealized gains	0.9	0.3
Unrealized losses	(0.1)	(0.2)
Estimated fair value	$ 908.1	$ 760.3

Investments (Proceeds from Sales of Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of investments	$ 141.9	$ 18.5	$ 74.6

Investments (Available-for-Sale Investments, Contractual Maturities) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Amortized Cost
Due within one year	$ 551.0
Due between one and three years	651.4
Total	1,202.4
Fair Value
Due within one year	551.2
Due between one and three years	652.8
Total	$ 1,204.0	$ 952.0

Acquisitions (Additional Details of Acquisitions) (Details) - Cyvera Ltd. shares in Millions, $ in Millions	Apr. 09, 2014 USD ($) shares
Restricted Stock Units (RSUs)
Business Acquisition
Equity interest issued	$ 6.4
Restricted common stock
Business Acquisition
Equity interest issued (in shares) \| shares	0.3
Equity interest issued	$ 17.6
Period to release restriction on restricted common stock (in years)	3 years

Acquisitions (Consideration Transferred) (Details) - USD ($) shares in Millions, $ in Millions	May 22, 2015	Apr. 09, 2014	Dec. 26, 2013
CirroSecure, Inc.
Business Acquisition
Cash	$ 15.3
Cyvera Ltd.
Business Acquisition
Cash		$ 90.1
Total		$ 177.6
Cyvera Ltd. \| Common Stock
Business Acquisition
Common stock (in shares)		1.3
Common stock		$ 87.5
Morta Security, Inc.
Business Acquisition
Cash			$ 10.3

Acquisitions (Purchase price allocation, Cyvera and Morta) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015	Apr. 09, 2014	Dec. 26, 2013
Business Acquisition
Goodwill	$ 163.5	$ 163.5
Cyvera Ltd.
Business Acquisition
Cash			$ 6.9
Goodwill			145.3
Identified intangible assets			42.3
Accrued and other liabilities, net			(7.0)
Long-term deferred tax liability, net			(9.9)
Total			$ 177.6
Morta Security, Inc.
Business Acquisition
Goodwill				$ 10.1
Identified intangible assets				2.2
Accrued and other liabilities, net				(2.0)
Total				$ 10.3

Acquisitions (Purchase Price Allocation, CirroSecure) (Details) - USD ($) $ in Millions	May 22, 2015	Jul. 31, 2016	Jul. 31, 2015
Business Acquisition
Goodwill		$ 163.5	$ 163.5
CirroSecure, Inc.
Business Acquisition
Goodwill	$ 8.1
Liabilities, net	3.8
Developed technology \| CirroSecure, Inc.
Business Acquisition
Identified intangible assets	$ 11.0
Estimated useful life (in years)	7 years

Acquisitions (Intangible assets acquired as part of business combination) (Details) - USD ($) $ in Millions	Apr. 09, 2014	Dec. 26, 2013
Cyvera Ltd.
Business Acquisition
Intangible assets acquired	$ 42.3
Cyvera Ltd. \| Developed technology
Business Acquisition
Finite-lived intangible assets acquired	$ 34.5
Estimated useful life (in years)	7 years
Cyvera Ltd. \| In-process research and development
Business Acquisition
Indefinite-lived Intangible Assets Acquired	$ 7.6
Cyvera Ltd. \| Other
Business Acquisition
Finite-lived intangible assets acquired	$ 0.2
Estimated useful life (in years)	2 years
Morta Security, Inc.
Business Acquisition
Finite-lived intangible assets acquired		$ 2.2
Morta Security, Inc. \| In-process research and development held for defensive purposes
Business Acquisition
Finite-lived intangible assets acquired		$ 1.9
Estimated useful life (in years)		3 years
Morta Security, Inc. \| Other
Business Acquisition
Finite-lived intangible assets acquired		$ 0.3
Estimated useful life (in years)		2 years

Intangible Assets (Intangible Assets and Related Amortization) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Finite-Lived Intangible Assets
Gross carrying amount	$ 64.4	$ 63.7
Accumulated amortization	(20.4)	(11.0)
Net carrying amount	44.0	52.7
Developed technology
Finite-Lived Intangible Assets
Gross carrying amount	53.1	53.1
Accumulated amortization	(15.4)	(7.7)
Net carrying amount	37.7	45.4
Acquired intellectual property
Finite-Lived Intangible Assets
Gross carrying amount	8.9	8.2
Accumulated amortization	(2.9)	(1.9)
Net carrying amount	6.0	6.3
In-process research and development held for defensive purposes
Finite-Lived Intangible Assets
Gross carrying amount	1.9	1.9
Accumulated amortization	(1.6)	(1.0)
Net carrying amount	0.3	0.9
Other
Finite-Lived Intangible Assets
Gross carrying amount	0.5	0.5
Accumulated amortization	(0.5)	(0.4)
Net carrying amount	$ 0.0	$ 0.1

Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 9.4	$ 7.9	$ 2.9

Intangible Assets (Future Amortization Expense) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	$ 8.7
2018	8.3
2019	8.2
2020	8.1
2021	6.5
2022 and thereafter	4.2
Net carrying amount	$ 44.0	$ 52.7

Property and Equipment (Property and Equipment by Type) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Property and Equipment
Property and equipment, gross	$ 195.4	$ 110.7
Less: accumulated depreciation	(78.2)	(47.8)
Total property and equipment, net	117.2	62.9
Computers, equipment, and software
Property and Equipment
Property and equipment, gross	102.7	62.6
Leasehold Improvements
Property and Equipment
Property and equipment, gross	58.0	25.5
Demonstration units
Property and Equipment
Property and equipment, gross	20.1	16.0
Furniture and fixtures
Property and Equipment
Property and equipment, gross	$ 14.6	$ 6.6

Property and Equipment (Depreciation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 33.1	$ 20.3	$ 14.0

Convertible Senior Notes (Additional Information) (Details) $ / shares in Units, shares in Millions, $ in Millions			12 Months Ended
	Jul. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) shares day $ / shares	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)
Debt Instrument, Redemption
Aggregate principal amount		$ 575.0
Contractual interest rate (in percentage)		0.00%
Number of common stock convertible at initial conversion rate (in shares) \| shares		5.2
Initial conversion rate (in shares per $1000 principal amount)		9.068
Initial conversion price (in usd per share) \| $ / shares		$ 110.28
Convertible Senior Notes, threshold trading days (in days) \| day		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) \| day		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 in event of change (in percentage)		100.00%
Debt issuance costs		$ 12.5
Equity issuance costs		$ 2.9
If-converted value in excess of principal	$ 80.0
Shares of common stock covered by Note Hedges (in shares) \| shares		5.2
Aggregate amount paid to purchase note hedges - additional paid-in capital					$ 111.0
Warrants sold, shares authorized to sell to counterparties (in shares) \| shares		5.2
Strike price of warrants (in usd per share) \| $ / shares		$ 137.85
Proceeds from issuance of warrants			$ 0.0	$ 0.0	$ 78.3
Level 2
Debt Instrument, Redemption
Fair value of Convertible Senior Notes	$ 761.9		$ 761.9	$ 994.8

Convertible Senior Notes (Components of Convertible Senior Notes) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Debt Disclosure [Abstract]
Principal amount	$ 575.0	$ 575.0
Less: debt discount, net of amortization	66.8	87.9
Net carrying amount	508.2	487.1
Equity (including temporary equity)	$ 109.8	$ 109.8

Convertible Senior Notes (Schedule of Interest Expense Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Debt Disclosure [Abstract]
Amortization of debt discount	$ 21.1	$ 20.2	$ 1.6
Amortization of debt issuance costs	2.3	2.1	0.2
Total interest expense recognized	$ 23.4	$ 22.3	$ 1.8
Effective interest rate of the liability component (in percentage)	4.80%	4.80%	4.80%

Commitments and Contingencies (Leases) (Details) ft² in Thousands, $ in Millions	1 Months Ended
	Jul. 31, 2013 USD ($) lease_agreement	Sep. 30, 2012 USD ($) ft² lease_agreement lease_renewal_option	Jul. 31, 2016 USD ($)	Oct. 31, 2015 USD ($) ft² lease_agreement	May 31, 2015 ft² lease_agreement
Operating Leased Assets
Total payments under the lease agreements			$ 509.3
Payments under this sub-lease			$ 5.1
Q113 new lease arrangements
Operating Leased Assets
Number of lease agreements \| lease_agreement		2
Area of additional office space (in square feet) \| ft²		300
Number of lease renewal options \| lease_renewal_option		2
Renewal term (in years)		5 years
Total payments under the lease agreements		$ 94.3
Sublease arrangement
Operating Leased Assets
Number of lease agreements \| lease_agreement	1
Term of sublease contract (in months)	51 months
Payments under this sub-lease	$ 10.7
Q415 new lease arrangements
Operating Leased Assets
Number of lease agreements \| lease_agreement					3
Area of additional office space (in square feet) \| ft²					752
Q116 new lease arrangement
Operating Leased Assets
Number of lease agreements \| lease_agreement				1
Area of additional office space (in square feet) \| ft²				310
Q415 and Q116 new lease arrangements
Operating Leased Assets
Total payments under the lease agreements				$ 376.7

Commitments and Contingencies (Rent Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Leases [Abstract]
Rent expense	$ 20.2	$ 15.4	$ 13.2

Commitments and Contingencies (Lease Commitment Schedule) (Details) $ in Millions	Jul. 31, 2016 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	$ 27.3
2018	33.3
2019	46.2
2020	49.8
2021	54.1
2022 and thereafter	298.6
Committed gross lease payments	509.3
Less: proceeds from sublease rental	5.1
Net operating lease obligation	$ 504.2

Commitments and Contingencies (Contract Manufacturer Commitments) (Details) $ in Millions	Jul. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contract manufacturer commitments	$ 54.2

Legal Settlement (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			12 Months Ended
	May 27, 2014	Jan. 27, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Loss Contingencies
Change in fair value of common stock warrant			$ 0.0	$ 0.0	$ 5.9
Juniper
Loss Contingencies
Legal settlement in cash, amount	$ 75.0
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	$ 182.5
Legal settlement in common stock, amount, settlement date	75.3
legal settlement in warrant, amount, settlement date	$ 32.2
Legal settlement in warrant, exercise price (in usd per share)	$ 0.0001
Change in fair value of common stock warrant					5.9
Settlement amount allocated to the licensing of intellectual property	$ 61.3
Settlement amount allocated to the mutual dismissal of claims	54.3
Settlement amount allocated to the mutual covenant not-to-sue	$ 66.9
Amortization period of intellectual property licensing (in years)	5 years
Fortinet
Loss Contingencies
Legal settlement in cash, amount		$ 20.0
Legal settlement expense					$ 20.0

Equity Award Plans (Share-Based Compensation Plans) (Details)	12 Months Ended
	Jul. 31, 2016 USD ($) $ / shares shares
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Option expiration period (in years)	10 years
Shares reserved for future issuance (in shares)	16,800,000
Increase in number of shares reserved for issuance on the first day of 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
Increase in number of shares reserved for issuance on the first day of fiscal year, maximum (in shares)	8,000,000
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for future issuance (in shares)	2,400,000
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, maximum (in percentage)	1.00%
Purchase price of common stock in percentage 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 (in percentage)	85.00%
Maximum subscription rate (in percentage)	15.00%
Purchase limit per employee, number of shares, during each offering period (in shares)	625
Purchase limit per employee, total fair value of common stock, for each calendar year \| $	$ 25,000
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	$ 126.96

Equity Award Plans (Stock Options Activity) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Options, Outstanding Roll Forward
Balance, beginning (in shares)	3.3
Options granted (in shares)	0.0
Options forfeited (in shares)	0.0
Options exercised (in shares)	(1.2)
Balance, ending (in shares)	2.1	3.3
Options, Outstanding, Weighted Average Exercise Price Roll Forward
Balance, beginning (in usd per share)	$ 13.74
Options granted (in usd per share)	0.00
Options forfeited (in usd per share)	0.00
Options exercised (in usd per share)	14.21
Balance, ending (in usd per share)	$ 13.42	$ 13.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual life (in years)	5 years 2 months	6 years 2 months
Aggregate intrinsic value	$ 244.9	$ 562.9
Options vested and expected to vest (in shares)	2.1
Options vested and expected to vest, weighted-average exercise price (in usd per share)	$ 13.42
Options vested and expected to vest, weighted-average remaining contractual term (in years)	5 years 2 months
Options vested and expected to vest, aggregate intrinsic value	$ 244.9
Options exercisable (in shares)	2.1
Options exercisable, weighted-average exercise price (in usd per share)	$ 13.42
Options exercisable, weighted-average remaining contractual term (in years)	5 years 2 months
Options exercisable, aggregate intrinsic value	$ 244.9
Total intrinsic value of options exercised in the period	176.1	301.1	$ 198.8
Total grant-date fair value of options vested in the period	$ 8.1	$ 14.6	$ 17.1

Equity Award Plans (RSUs and RSAs Activities) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
RSUs and RSAs, Outstanding Roll Forward
Granted (in shares)	4.3
Restricted stock awards (RSAs)
RSUs and RSAs, Outstanding Roll Forward
Balance, beginning (in shares)	0.0
Granted (in shares)	1.1
Vested (in shares)	0.0
Forfeited (in shares)	0.0
Balance, ending (in shares)	1.1	0.0
RSUs and RSAs, Outstanding, Weighted Average Grant-Date Fair Value Per Share
Balance, beginning (in usd per share)	$ 0.00
Granted (in usd per share)	170.97
Vested (in usd per share)	0.00
Forfeited (in usd per share)	0.00
Balance, ending (in usd per share)	$ 170.97	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Expected to vest (in shares)	1.0
Expected to vest, weighted-average grant-date fair value per share (in usd per share)	$ 170.97
Restricted Stock Units (RSUs)
RSUs and RSAs, Outstanding Roll Forward
Balance, beginning (in shares)	7.2
Granted (in shares)	3.2
Vested (in shares)	(3.3)
Forfeited (in shares)	(0.6)
Balance, ending (in shares)	6.5	7.2
RSUs and RSAs, Outstanding, Weighted Average Grant-Date Fair Value Per Share
Balance, beginning (in usd per share)	$ 95.66
Granted (in usd per share)	160.60	$ 122.36	$ 61.00
Vested (in usd per share)	89.76
Forfeited (in usd per share)	104.08
Balance, ending (in usd per share)	$ 130.14	$ 95.66
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 1 month	1 year 2 months
Aggregate intrinsic value	$ 852.7	$ 1,334.8
Expected to vest (in shares)	6.2
Expected to vest, weighted-average grant-date fair value per share (in usd per share)	$ 129.64
RSUs expected to vest, weighted-average remaining contractual term (in years)	1 year 1 month
RSUs expected to vest, aggregate intrinsic value	$ 810.0
Total fair value of RSUs vested in the period	$ 513.0	$ 350.4	$ 57.4

Equity Award Plans (Shares Available for Grant Roll-forward) (Details) shares in Millions	12 Months Ended
	Jul. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for grant, beginning (in shares)	8.1
Authorized (in shares)	3.8
RSUs and RSAs granted (in shares)	(4.3)
Shares available for grant, ending (in shares)	8.2
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
RSUs and RSAs granted (in shares)	(3.2)
RSUs forfeited (in shares)	0.6

Equity Award Plans (Allocation of Share Based Compensation Expense By Functional Area) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated share-based compensation expense	$ 392.9	$ 221.4	$ 99.9
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated share-based compensation expense	6.2	3.9	1.6
Cost of service revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated share-based compensation expense	40.9	20.4	9.4
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated share-based compensation expense	132.9	74.8	29.5
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated share-based compensation expense	152.4	84.1	42.6
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Allocated share-based compensation expense	$ 60.5	$ 38.2	$ 16.8

Equity Award Plans (Allocation of Share-based Compensation Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense	$ 392.9	$ 221.4	$ 99.9
Total compensation cost not yet recognized, nonvested awards, net of estimated forfeitures	$ 822.9
Compensation expense not yet recognized, period for recognition (in years)	2 years 5 months
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense	$ 60.5	$ 38.2	16.8
Modification, incremental compensation expense			$ 3.4

Income Taxes (Loss Before Provision for Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Income Tax Disclosure [Abstract]
United States									$ (216.2)	$ (47.5)	$ (149.3)
Foreign									11.1	(108.1)	(72.9)
Loss before income taxes	$ (48.7)	$ (63.4)	$ (58.6)	$ (34.4)	$ (40.6)	$ (42.4)	$ (43.7)	$ (28.9)	$ (205.1)	$ (155.6)	$ (222.2)

Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Federal:
Current									$ 1.9	$ 1.8	$ 0.8
Deferred									(0.6)	(3.0)	0.0
State:
Current									1.1	0.7	0.2
Deferred									(0.1)	(0.4)	(0.3)
Foreign:
Current									19.1	10.7	4.7
Deferred									(0.6)	(0.4)	(1.1)
Total	$ 5.8	$ 6.8	$ 3.9	$ 4.3	$ 5.4	$ 3.5	$ (0.7)	$ 1.2	$ 20.8	$ 9.4	$ 4.3

Income Taxes (Effective Tax Reconciliation) (Details)	12 Months Ended
Income Taxes (Effective Tax Reconciliation) (Details)	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	(1.50%)	3.60%	1.30%
Foreign income at other than U.S. rates	(8.80%)	(6.50%)	(12.10%)
Change in valuation allowance	(24.90%)	(28.50%)	(21.30%)
Share-based compensation	(13.30%)	(10.20%)	(3.20%)
Amortization of deferred tax charges	(2.80%)	(2.20%)	0.00%
Research credits	9.50%	6.70%	1.30%
Other, net	(3.40%)	(3.90%)	(2.90%)
Total	(10.20%)	(6.00%)	(1.90%)

Income Taxes (Components of the deferred tax assets and liabilities) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Deferred tax assets:
Accruals and reserves	$ 43.5	$ 38.9
Deferred revenue	62.0	35.3
Research and development and foreign tax credits	41.4	20.1
Net operating loss carryforwards	5.4	18.4
Share-based compensation	55.2	35.9
Gross deferred tax assets	207.5	148.6
Valuation allowance	(189.4)	(138.4)
Total deferred tax assets	18.1	10.2
Deferred tax liabilities
Fixed assets and intangible assets	(14.2)	(7.9)
Other deferred tax liabilities	(2.5)	(1.6)
Deferred Tax Liabilities, Gross	(16.7)	(9.5)
Total	$ 1.4	$ 0.7

Income Taxes (Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Business Acquisition
Valuation Allowance, Increase (Decrease)	$ 51.0
CirroSecure, Inc.
Business Acquisition
Valuation Allowance, Increase (Decrease)		$ (3.4)

Income Taxes (Net Operating Loss Carryforward) (Details) $ in Millions	Jul. 31, 2016 USD ($)
Federal
Operating Loss Carryforwards
Operating loss carryforwards	$ 1,100.0
State
Operating Loss Carryforwards
Operating loss carryforwards	823.8
Foreign
Operating Loss Carryforwards
Operating loss carryforwards	$ 8.9

Income Taxes (Tax Credit Carryforwards) (Details) $ in Millions	Jul. 31, 2016 USD ($)
Federal \| Research tax credit carryforward
Tax Credit Carryforward
Tax credit carryforward	$ 37.1
State \| Research tax credit carryforward
Tax Credit Carryforward
Tax credit carryforward	37.2
Foreign
Tax Credit Carryforward
Tax credit carryforward	$ 1.7

Income Taxes (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]
Excess tax benefits included in federal net operating losses	$ 1,000.0
Excess tax benefit included in state net operating loss	669.7
Excess tax benefit included in foreign net operating loss	8.9
Excess tax benefit included in federal research and development tax credit	5.3
Excess tax benefit from share-based compensation arrangements	0.5	$ 2.5	$ 1.0
Unrecognized tax benefits	127.7	67.2	10.4	$ 6.6
Unrecognized tax benefits that would affect income tax expense	21.9	10.8
Income tax expense related to interest and penalties	1.6	1.1	$ 0.3
Interest and penalties accrued	3.3	$ 1.8
Undistributed earnings of foreign subsidiaries	$ 9.7

Income Taxes (Unrecognized tax benefit roll-forward)(Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Unrecognized tax benefits at the beginning of the period	$ 67.2	$ 10.4	$ 6.6
Additions for tax positions taken in prior years	25.2	6.1	0.4
Reductions for tax positions taken in prior years	0.0	(0.6)	0.0
Additions for tax positions related to the current year	35.3	51.3	3.4
Unrecognized tax benefits at the end of the period	$ 127.7	$ 67.2	$ 10.4

Net Income (Loss) Per Share (Computation of Basic and Diluted Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Earnings Per Share [Abstract]
Net loss	$ (54.5)	$ (70.2)	$ (62.5)	$ (38.7)	$ (46.0)	$ (45.9)	$ (43.0)	$ (30.1)	$ (225.9)	$ (165.0)	$ (226.5)
Weighted-average shares used to compute net loss per share, basic and diluted									87.1	81.6	74.3
Net loss per share, basic and diluted	$ (0.61)	$ (0.80)	$ (0.72)	$ (0.45)	$ (0.55)	$ (0.56)	$ (0.53)	$ (0.38)	$ (2.59)	$ (2.02)	$ (3.05)

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details) - shares shares in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	20.2	21.0	22.3
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	6.5	7.2	6.0
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	5.2	5.2	5.2
Warrants related to the issuance of convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	5.2	5.2	5.2
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	2.1	3.3	5.8
Restricted stock awards (RSAs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	1.1	0.0	0.0
ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	0.1	0.1	0.1

Segment Information (Revenue by geographic theater) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Segment Reporting Information
Revenues	$ 1,378.5	$ 928.1	$ 598.2
United States
Segment Reporting Information
Revenues	901.8	593.8	363.2
Other Americas
Segment Reporting Information
Revenues	71.4	45.6	33.5
Total Americas
Segment Reporting Information
Revenues	973.2	639.4	396.7
EMEA
Segment Reporting Information
Revenues	247.1	178.7	126.9
APAC
Segment Reporting Information
Revenues	$ 158.2	$ 110.0	$ 74.6

Segment Information (Revenue from External Customers by Products and Services) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenue from External Customer
Product	$ 191.1	$ 162.1	$ 169.9	$ 147.7	$ 154.1	$ 121.5	$ 115.6	$ 101.5	$ 670.8	$ 492.7	$ 340.1
Services	209.7	183.7	164.8	149.5	129.8	112.7	102.1	90.8	707.7	435.4	258.1
Total revenue	$ 400.8	$ 345.8	$ 334.7	$ 297.2	$ 283.9	$ 234.2	$ 217.7	$ 192.3	1,378.5	928.1	598.2
Subscription
Revenue from External Customer
Services									357.0	212.7	123.2
Support and maintenance
Revenue from External Customer
Services									$ 350.7	$ 222.7	$ 134.9

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenue:
Product	$ 191.1	$ 162.1	$ 169.9	$ 147.7	$ 154.1	$ 121.5	$ 115.6	$ 101.5	$ 670.8	$ 492.7	$ 340.1
Services	209.7	183.7	164.8	149.5	129.8	112.7	102.1	90.8	707.7	435.4	258.1
Total revenue	400.8	345.8	334.7	297.2	283.9	234.2	217.7	192.3	1,378.5	928.1	598.2
Cost of revenue:
Product	48.5	43.2	44.9	38.8	38.5	32.8	30.7	29.1	175.4	131.1	85.5
Services	53.2	51.7	49.3	40.4	35.8	31.6	28.7	24.3	194.6	120.4	74.1
Total cost of revenue	101.7	94.9	94.2	79.2	74.3	64.4	59.4	53.4	370.0	251.5	159.6
Total gross profit	299.1	250.9	240.5	218.0	209.6	169.8	158.3	138.9	1,008.5	676.6	438.6
Operating expenses:
Research and development	76.5	74.0	74.0	59.7	53.1	48.4	47.0	37.3	284.2	185.8	104.8
Sales and marketing	228.1	202.0	187.6	158.3	162.4	131.1	122.8	106.4	776.0	522.7	334.8
General and administrative	39.9	33.5	34.2	30.8	28.6	27.0	27.0	19.0	138.4	101.6	73.1
Total operating expenses	344.5	309.5	295.8	248.8	244.1	206.5	196.8	162.7	1,198.6	810.1	653.9
Operating loss	(45.4)	(58.6)	(55.3)	(30.8)	(34.5)	(36.7)	(38.5)	(23.8)	(190.1)	(133.5)	(215.3)
Interest expense	(6.0)	(5.8)	(5.8)	(5.8)	(5.6)	(5.7)	(5.5)	(5.5)	(23.4)	(22.3)	(1.9)
Other income (expense), net	2.7	1.0	2.5	2.2	(0.5)	0.0	0.3	0.4	8.4	0.2	(5.0)
Loss before income taxes	(48.7)	(63.4)	(58.6)	(34.4)	(40.6)	(42.4)	(43.7)	(28.9)	(205.1)	(155.6)	(222.2)
Provision for (benefit from) for income taxes	5.8	6.8	3.9	4.3	5.4	3.5	(0.7)	1.2	20.8	9.4	4.3
Net loss	$ (54.5)	$ (70.2)	$ (62.5)	$ (38.7)	$ (46.0)	$ (45.9)	$ (43.0)	$ (30.1)	$ (225.9)	$ (165.0)	$ (226.5)
Net loss per share, basic and diluted	$ (0.61)	$ (0.80)	$ (0.72)	$ (0.45)	$ (0.55)	$ (0.56)	$ (0.53)	$ (0.38)	$ (2.59)	$ (2.02)	$ (3.05)

Subsequent Events (Details) - Subsequent Event [Member] € in Millions, $ in Millions	Aug. 31, 2016 EUR (€)	Aug. 26, 2016 USD ($)
Subsequent Event
Stock repurchase program, authorized amount \| $		$ 500.0
Foreign Exchange Forward
Subsequent Event
Forward contracts, notional amount \| €	€ 66.9