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Document and Entity Information Document - shares	3 Months Ended
Document and Entity Information Document - shares	Oct. 31, 2015	Nov. 16, 2015
Document Information [Abstract]
Entity Registrant Name	Palo Alto Networks Inc
Entity Central Index Key	0001327567
Document Type	10-Q
Document Period End Date	Oct. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Document Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		85,908,948

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Oct. 31, 2015	Jul. 31, 2015
Current assets:
Cash and cash equivalents	$ 275.8	$ 375.8
Short-term investments	485.5	413.2
Accounts receivable, net of allowance for doubtful accounts of $0.8 and $0.7 at October 31, 2015 and July 31, 2015, respectively	196.4	212.4
Prepaid expenses and other current assets	82.2	72.6
Total current assets	1,039.9	1,074.0
Property and equipment, net	76.7	62.9
Long-term investments	694.5	538.8
Goodwill	163.5	163.5
Intangible assets, net	51.0	52.7
Other assets	68.8	73.3
Total assets	2,094.4	1,965.2
Current liabilities:
Accounts payable	17.5	13.2
Accrued compensation	52.8	79.8
Accrued and other liabilities	38.3	28.2
Deferred revenue	477.3	423.9
Convertible senior notes, net	492.3	487.1
Total current liabilities	1,078.2	1,032.2
Long-term deferred revenue	327.2	289.8
Other long-term liabilities	62.5	67.4
Commitments and contingencies (Note 5)
Temporary equity	82.7	87.9
Stockholders' equity:
Preferred stock; $0.0001 par value; 100 shares authorized; none issued and outstanding at October 31, 2015 and July 31, 2015	0.0	0.0
Common stock and additional paid-in capital; $0.0001 par value; 1,000 shares authorized; 85.9 and 84.8 shares issued and outstanding at October 31, 2015 and July 31, 2015, respectively	1,083.6	988.7
Accumulated other comprehensive loss	(0.4)	(0.1)
Accumulated deficit	(539.4)	(500.7)
Total stockholders’ equity	543.8	487.9
Total liabilities, temporary equity, and stockholders’ equity	$ 2,094.4	$ 1,965.2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Oct. 31, 2015	Jul. 31, 2015
Current assets:
Allowance for doubtful accounts (in usd)	$ 0.8	$ 0.7
Stockholders' equity:
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	85,900,000	84,800,000
Common stock, shares outstanding (in shares)	85,900,000	84,800,000

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Revenue:
Product	$ 147.7	$ 101.5
Services	149.5	90.8
Total revenue	297.2	192.3
Cost of revenue:
Product	38.8	29.1
Services	40.4	24.3
Total cost of revenue	79.2	53.4
Total gross profit	218.0	138.9
Operating expenses:
Research and development	59.7	37.3
Sales and marketing	158.3	106.4
General and administrative	30.8	19.0
Total operating expenses	248.8	162.7
Operating loss	(30.8)	(23.8)
Interest expense	(5.8)	(5.5)
Other income, net	2.2	0.4
Loss before income taxes	(34.4)	(28.9)
Provision for income taxes	4.3	1.2
Net loss	$ (38.7)	$ (30.1)
Net loss per share, basic and diluted	$ (0.45)	$ (0.38)
Weighted-average shares used to compute net loss per share, basic and diluted	85.1	79.4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Net loss	$ (38.7)	$ (30.1)
Other comprehensive income (loss), net of tax:
Change in unrealized gains (losses) on investments	(0.3)	0.1
Comprehensive loss	$ (39.0)	$ (30.0)

- Definition

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

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Cash flows from operating activities
Net loss	$ (38.7)	$ (30.1)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation for equity based awards	72.9	38.4
Depreciation and amortization	9.2	6.1
Amortization of investment premiums, net of accretion of purchase discounts	0.8	0.7
Amortization of debt discount and debt issuance costs	5.7	5.5
Excess tax benefit from share-based compensation arrangements	(0.2)	(0.3)
Changes in operating assets and liabilities:
Accounts receivable, net	16.0	19.3
Prepaid expenses and other assets	5.0	3.4
Accounts payable	5.2	(4.5)
Accrued compensation	(27.0)	(12.8)
Accrued and other liabilities	7.0	1.0
Deferred revenue	90.8	48.2
Net cash provided by operating activities	146.7	74.9
Cash flows from investing activities
Purchases of investments	(512.5)	(247.9)
Proceeds from sales of investments	124.4	2.0
Proceeds from maturities of investments	144.1	50.7
Purchases of property, equipment, and other assets	(19.5)	(5.9)
Net cash used in investing activities	(263.5)	(201.1)
Cash flows from financing activities
Proceeds from sales of shares through employee equity incentive plans	16.6	15.8
Excess tax benefit from share-based compensation arrangements	0.2	0.3
Net cash provided by financing activities	16.8	16.1
Net decrease in cash and cash equivalents	(100.0)	(110.1)
Cash and cash equivalents—beginning of period	375.8	653.8
Cash and cash equivalents—end of period	$ 275.8	$ 543.7

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Oct. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Description of Business Palo Alto Networks, Inc. (the “Company,” “we,” “us,” or “our”), located in Santa Clara, California, was incorporated in March 2005 under the laws of the State of Delaware and commenced operations in April 2005. We offer a next-generation security platform that empowers enterprises, service providers, and government entities to secure their organizations by safely enabling the increasingly complex and rapidly growing number of applications running on their networks and by preventing breaches in real-time that stem from targeted cyber attacks. Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, consistent in all material respects with those applied in our Annual Report on Form 10-K for the fiscal year ended July 31, 2015, filed with the Securities and Exchange Commission on September 17, 2015. The condensed consolidated financial statements are unaudited, but include all adjustments of a normal recurring nature necessary for a fair presentation of our quarterly results. We have made estimates and judgments affecting the amounts reported in our condensed consolidated financial statements and the accompanying notes. The actual results that we experience may differ materially from our estimates. Certain prior period amounts have been reclassified to conform to current period presentation. The condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes in our Annual Report on Form 10-K for the fiscal year ended July 31, 2015. Principles of Consolidation The condensed consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Summary of Significant Accounting Policies There have been no material changes to our significant accounting policies as of and for the three months ended October 31, 2015, as compared to the significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended July 31, 2015. Recent Accounting Pronouncements In April 2015, the Financial Accounting Standards Board (FASB) issued new authoritative guidance on fees paid in a cloud computing arrangement. The standard requires customers in a cloud computing arrangement to evaluate whether the arrangement includes a software license. If the arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. The standard is effective for us for our first quarter of fiscal 2017 and will be applied on either a prospective or retrospective basis. We are currently evaluating adoption methods and whether this standard will have a material impact on our condensed 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 condensed 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 condensed consolidated financial statements.

Fair Value Measurements

3 Months Ended

Oct. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

We categorize assets and liabilities recorded at fair value on our condensed 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 October 31, 2015 and July 31, 2015 (in millions):



	October 31, 2015								July 31, 2015
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents:
U.S. government and agency securities	$	—	$	14.8	$	—	$	14.8	$	—	$	—	$	—	$	—
Total cash equivalents	—		14.8		—		14.8		—		—		—		—
Short-term investments:
Certificates of deposit	—		1.0		—		1.0		—		1.0		—		1.0
Corporate debt securities	—		111.6		—		111.6		—		97.8		—		97.8
U.S. government and agency securities	—		372.9		—		372.9		—		314.4		—		314.4
Total short-term investments	—		485.5		—		485.5		—		413.2		—		413.2
Long-term investments:
Corporate debt securities	—		180.3		—		180.3		—		92.9		—		92.9
U.S. government and agency securities	—		514.2		—		514.2		—		445.9		—		445.9
Total long-term investments	—		694.5		—		694.5		—		538.8		—		538.8
Total assets measured at fair value	$	—	$	1,194.8	$	—	$	1,194.8	$	—	$	952.0	$	—	$	952.0

Refer to Note 4. Convertible Senior Notes for the carrying amount and estimated fair value of our convertible senior notes as of October 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

3 Months Ended

Oct. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investments

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



	October 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1.0	$	—	$	—		$	1.0
Corporate debt securities	292.1		0.1		(0.3		)	291.9
U.S. government and agency securities	902.1		0.2		(0.4		)	901.9
Total	$	1,195.2	$	0.3	$	(0.7	)	$	1,194.8



	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 October 31, 2015 and July 31, 2015.

The following table summarizes the amortized cost and fair value of our available-for-sale investments as of October 31, 2015, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	500.2	$	500.3
Due between one and three years	695.0		694.5
Total	$	1,195.2	$	1,194.8

- Definition

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

+ References + Details

Convertible Senior Notes

3 Months Ended

Oct. 31, 2015

Debt Disclosure [Abstract]

Convertible Senior Notes

On June 30, 2014, we issued $575.0 million aggregate principal amount of 0.0% Convertible Senior Notes due 2019 (the “Notes”). The Notes mature on July 1, 2019 unless converted or repurchased in accordance with their terms prior to such date. The Notes do not contain any financial covenants and 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 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:


•	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 (the “trading price condition”); 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 sale price condition was initially met during the fiscal quarter ended April 30, 2015. The sale price condition continued to be met through the fiscal quarter ended October 31, 2015 and as a result, holders may convert their Notes at any time during the fiscal quarter ending January 31, 2016. Accordingly, the net carrying amount of the Notes was classified in current liabilities and a portion of the equity component representing the conversion option was classified as temporary equity in our condensed consolidated balance sheets as of October 31, 2015. The portion of the equity component classified as temporary equity is measured as the difference between the principal and net carrying amount of the Notes.

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



	October 31, 2015			July 31, 2015
Liability:
Principal	$	575.0		$	575.0
Less: debt discount, net of amortization	82.7			87.9
Net carrying amount	$	492.3		$	487.1

Equity (including temporary equity)	$	(109.8	)	$	(109.8	)

The total estimated fair value of the Notes was $896.3 million and $994.8 million at October 31, 2015 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 October 31, 2015 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 October 31, 2015, the if-converted value of the Notes exceeded its principal amount by $308.0 million.

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



	Three Months Ended October 31,
	2015			2014
Amortization of debt discount	$	5.2		$	5.0
Amortization of debt issuance costs	0.5			0.5
Total interest expense recognized	$	5.7		$	5.5

Effective interest rate of the liability component	4.8		%	4.8		%

Note Hedges

To minimize the impact of potential economic dilution upon conversion of the Notes, we entered into convertible note hedge transactions (the “Note Hedges”) with respect to our common stock concurrent with the issuance of the Notes. The Note Hedges cover up to 5.2 million shares of our common stock 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.

Warrants

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

For more information on the Notes, the Note Hedges, and the Warrants, refer to Note 7. Convertible Senior Notes of Notes to Consolidated Financial Statements included in Part II, Item 8 of our Annual Report on Form 10-K for the fiscal year ended July 31, 2015.

Commitments and Contingencies

3 Months Ended

Oct. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Leases

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

In 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, which will commence in December 2017 and expire in April 2028. The site is currently under construction and as a result, the lease commencement date may change based on progress of the construction project. The lease contains a rent holiday period, scheduled rent increases, lease incentives, and renewal options which allow the lease term to be extended through April 2046. Rental payments under the fourth lease agreement are approximately $101.2 million over the initial lease term.

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



	Amount
Fiscal years ending July 31:
Remaining 2016	$	16.9
2017	25.1
2018	28.2
2019	41.9
2020	45.9
2021 and thereafter	350.5
Committed gross lease payments	508.5
Less: proceeds from sublease rental	7.4
Net operating lease obligation	$	501.1

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 October 31, 2015, our purchase commitments under such orders were $46.3 million, excluding obligations under contracts that we can cancel without a significant penalty.

Litigation

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 October 31, 2015, we have not recorded any significant accruals for loss contingencies associated with such legal proceedings, determined that an unfavorable outcome is probable or reasonably possible, or determined that the amount or range of any possible loss is reasonably estimable.

Equity Award Plans

3 Months Ended

Oct. 31, 2015

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

Equity Award Plans

Stock Option Activities

A summary of the activity under our stock plans during the reporting period and a summary of information related to options exercisable, vested, and expected to vest are presented below (in 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	(0.4	)	11.46
Balance—October 31, 2015	2.9		$	14.06	5.9	$	420.2
Options vested and expected to vest—October 31 2015	2.9		$	14.04	5.9	$	419.6
Options exercisable—October 31, 2015	2.5		$	12.89	5.9	$	364.2

Restricted Stock Unit (RSU) Activities

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



	RSUs Outstanding
	Number of Shares		Weighted- Average Grant-Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2015	7.2		$	95.66	1.2	$	1,334.8
RSUs granted	0.4		171.01
RSUs vested	(0.6	)	66.60
RSUs forfeited	(0.2	)	82.45
Balance—October 31, 2015	6.8		$	103.05	1.1	$	1,101.0
RSUs vested and expected to vest—October 31, 2015	6.5		$	102.49	1.1	$	1,046.0

Share-Based Compensation

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



	Three Months Ended October 31,
	2015		2014
Cost of product revenue	$	1.3	$	0.7
Cost of services revenue	7.0		3.5
Research and development	25.0		14.0
Sales and marketing	27.2		15.8
General and administrative	12.4		4.5
Total	$	72.9	$	38.5

At October 31, 2015, total compensation cost related to unvested share-based awards not yet recognized was $570.9 million, net of estimated forfeitures. This cost is expected to be amortized on a straight-line basis over a weighted-average period of approximately three years.

Income Taxes	3 Months Ended
Income Taxes	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our provision for income taxes for the three months ended October 31, 2015 reflects an effective tax rate of negative 12.2%. Our effective tax rate for this period was negative as we recorded a provision for income taxes on year to date losses. The key components of our income tax provision primarily consist of foreign income taxes, withholding taxes, U.S. federal and state income taxes, and amortization of our deferred tax charges. Key components of our effective tax rate consist of foreign tax losses which derive no benefit, non-deductible share-based compensation, and changes in our valuation allowance. As compared to the same period last year, our effective tax rate changed primarily due to an increase in non-deductible share-based compensation, changes in our valuation allowance against deferred tax assets, and amortization of our deferred tax charges. Our provision for income taxes for the three months ended October 31, 2014 reflects an effective tax rate of negative 4.0%. Our effective tax rate for this period was negative as we recorded a provision for income taxes on year to date losses. The key components of our income tax provision consist of foreign income taxes, withholding taxes, and limited U.S. federal and state income tax due primarily to our net operating loss carryforward. Key components of our effective tax rate consist of foreign tax losses which derive no benefit, non-deductible share-based compensation, and changes in our valuation allowance.

Net Income (Loss) Per Share

3 Months Ended

Oct. 31, 2015

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

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

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



	Three Months Ended
	October 31,
	2015			2014
Net loss	$	(38.7	)	$	(30.1	)
Weighted-average shares used to compute net loss per share, basic and diluted	85.1			79.4
Net loss per share, basic and diluted	$	(0.45	)	$	(0.38	)

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):



	October 31,
	2015	2014
Options to purchase common stock	2.9	5.2
RSUs	6.8	6.2
Convertible senior notes	5.2	5.2
Warrants related to the issuance of convertible senior notes	5.2	5.2
Total	20.1	21.8

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

3 Months Ended

Oct. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, consistent in all material respects with those applied in our Annual Report on Form 10-K for the fiscal year ended July 31, 2015, filed with the Securities and Exchange Commission on September 17, 2015. The condensed consolidated financial statements are unaudited, but include all adjustments of a normal recurring nature necessary for a fair presentation of our quarterly results. We have made estimates and judgments affecting the amounts reported in our condensed consolidated financial statements and the accompanying notes. The actual results that we experience may differ materially from our estimates. Certain prior period amounts have been reclassified to conform to current period presentation.

The condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes in our Annual Report on Form 10-K for the fiscal year ended July 31, 2015.

Principles of Consolidation

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

Recent Accounting Pronouncements

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

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)

3 Months Ended

Oct. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of fair value of financial assets and liabilities

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



	October 31, 2015								July 31, 2015
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents:
U.S. government and agency securities	$	—	$	14.8	$	—	$	14.8	$	—	$	—	$	—	$	—
Total cash equivalents	—		14.8		—		14.8		—		—		—		—
Short-term investments:
Certificates of deposit	—		1.0		—		1.0		—		1.0		—		1.0
Corporate debt securities	—		111.6		—		111.6		—		97.8		—		97.8
U.S. government and agency securities	—		372.9		—		372.9		—		314.4		—		314.4
Total short-term investments	—		485.5		—		485.5		—		413.2		—		413.2
Long-term investments:
Corporate debt securities	—		180.3		—		180.3		—		92.9		—		92.9
U.S. government and agency securities	—		514.2		—		514.2		—		445.9		—		445.9
Total long-term investments	—		694.5		—		694.5		—		538.8		—		538.8
Total assets measured at fair value	$	—	$	1,194.8	$	—	$	1,194.8	$	—	$	952.0	$	—	$	952.0

Investments (Tables)

3 Months Ended

Oct. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale investments

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



	October 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	1.0	$	—	$	—		$	1.0
Corporate debt securities	292.1		0.1		(0.3		)	291.9
U.S. government and agency securities	902.1		0.2		(0.4		)	901.9
Total	$	1,195.2	$	0.3	$	(0.7	)	$	1,194.8



	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 October 31, 2015, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	500.2	$	500.3
Due between one and three years	695.0		694.5
Total	$	1,195.2	$	1,194.8

- 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

Convertible Senior Notes (Tables)

3 Months Ended

Oct. 31, 2015

Debt Disclosure [Abstract]

Components of Convertible Senior Notes

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



	October 31, 2015			July 31, 2015
Liability:
Principal	$	575.0		$	575.0
Less: debt discount, net of amortization	82.7			87.9
Net carrying amount	$	492.3		$	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):



	Three Months Ended October 31,
	2015			2014
Amortization of debt discount	$	5.2		$	5.0
Amortization of debt issuance costs	0.5			0.5
Total interest expense recognized	$	5.7		$	5.5

Effective interest rate of the liability component	4.8		%	4.8		%

Commitments and Contingencies (Tables)

3 Months Ended

Oct. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments for operating leases

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



	Amount
Fiscal years ending July 31:
Remaining 2016	$	16.9
2017	25.1
2018	28.2
2019	41.9
2020	45.9
2021 and thereafter	350.5
Committed gross lease payments	508.5
Less: proceeds from sublease rental	7.4
Net operating lease obligation	$	501.1

Equity Award Plans (Tables)

3 Months Ended

Oct. 31, 2015

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

Schedule of stock options activity



	Options Outstanding
	Number of Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2015	3.3		$	13.74	6.2	$	562.9
Options granted	—		—
Options forfeited	—		—
Options exercised	(0.4	)	11.46
Balance—October 31, 2015	2.9		$	14.06	5.9	$	420.2
Options vested and expected to vest—October 31 2015	2.9		$	14.04	5.9	$	419.6
Options exercisable—October 31, 2015	2.5		$	12.89	5.9	$	364.2

Schedule of restricted stock units award activity



	RSUs Outstanding
	Number of Shares		Weighted- Average Grant-Date Fair Value Per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balance—July 31, 2015	7.2		$	95.66	1.2	$	1,334.8
RSUs granted	0.4		171.01
RSUs vested	(0.6	)	66.60
RSUs forfeited	(0.2	)	82.45
Balance—October 31, 2015	6.8		$	103.05	1.1	$	1,101.0
RSUs vested and expected to vest—October 31, 2015	6.5		$	102.49	1.1	$	1,046.0

Schedule of allocation of share based compensation expense

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



	Three Months Ended October 31,
	2015		2014
Cost of product revenue	$	1.3	$	0.7
Cost of services revenue	7.0		3.5
Research and development	25.0		14.0
Sales and marketing	27.2		15.8
General and administrative	12.4		4.5
Total	$	72.9	$	38.5

Net Income (Loss) Per Share (Tables)

3 Months Ended

Oct. 31, 2015

Earnings Per Share [Abstract]

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

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



	Three Months Ended
	October 31,
	2015			2014
Net loss	$	(38.7	)	$	(30.1	)
Weighted-average shares used to compute net loss per share, basic and diluted	85.1			79.4
Net loss per share, basic and diluted	$	(0.45	)	$	(0.38	)

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):



	October 31,
	2015	2014
Options to purchase common stock	2.9	5.2
RSUs	6.8	6.2
Convertible senior notes	5.2	5.2
Warrants related to the issuance of convertible senior notes	5.2	5.2
Total	20.1	21.8

Fair Value Measurements (Details) - USD ($) $ in Millions	Oct. 31, 2015	Jul. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 14.8	$ 0.0
Short-term investments	485.5	413.2
Long-term investments	694.5	538.8
Total assets measured at fair value	1,194.8	952.0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
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
Cash equivalents	14.8	0.0
Short-term investments	485.5	413.2
Long-term investments	694.5	538.8
Total assets measured at fair value	1,194.8	952.0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Total assets measured at fair value	0.0	0.0
U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	14.8	0.0
Short-term investments	372.9	314.4
Long-term investments	514.2	445.9
U.S. government and agency securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
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
Cash equivalents	14.8	0.0
Short-term investments	372.9	314.4
Long-term investments	514.2	445.9
U.S. government and agency securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	1.0	1.0
Certificates of deposit \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-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	1.0	1.0
Certificates of deposit \| 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	111.6	97.8
Long-term investments	180.3	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	111.6	97.8
Long-term investments	180.3	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

Investments (Available-for-Sale Investments) (Details) - USD ($) $ in Millions	Oct. 31, 2015	Jul. 31, 2015
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,195.2	$ 952.1
Unrealized Gains	0.3	0.3
Unrealized Losses	(0.7)	(0.4)
Estimated Fair Value	1,194.8	952.0
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	1.0	1.0
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Estimated Fair Value	1.0	1.0
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	292.1	190.9
Unrealized Gains	0.1	0.0
Unrealized Losses	(0.3)	(0.2)
Estimated Fair Value	291.9	190.7
U.S. government and agency securities
Schedule of Available-for-sale Securities
Amortized Cost	902.1	760.2
Unrealized Gains	0.2	0.3
Unrealized Losses	(0.4)	(0.2)
Estimated Fair Value	$ 901.9	$ 760.3

Investments (Available-for-Sale Investments, Contractual Maturities) (Details) - USD ($) $ in Millions	Oct. 31, 2015	Jul. 31, 2015
Amortized Cost
Due within one year	$ 500.2
Due between one and three years	695.0
Total	1,195.2
Fair Value
Due within one year	500.3
Due between one and three years	694.5
Total	$ 1,194.8	$ 952.0

Convertible Senior Notes (Additional Information) (Details) $ / shares in Units, shares in Millions, $ in Millions	Oct. 31, 2015 USD ($)	Jun. 30, 2014 USD ($) shares $ / shares	Jul. 31, 2015 USD ($)
Debt Instrument
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 price (in usd per share) \| $ / shares		$ 110.28
Convertible Senior Notes, threshold trading days (in days)		20
Convertible Senior Notes, threshold consecutive trading days (in days)		30 days
Convertible Senior Notes, threshold percentage of stock price trigger (in percentage)		130.00%
Convertible Senior Notes, threshold business days, per $1,000 principal		5
Convertible Senior Notes, threshold consecutive trading days, per $1,000 principal		5 days
Convertible Senior Notes, threshold percentage of Note price trigger, per $1,000 principal (in percentage)		98.00%
If-converted value in excess of principal \| $	$ 308.0
Shares of common stock covered by Note Hedges (in shares) \| shares		5.2
Warrants sold, shares authorized to sell to counterparties (in shares) \| shares		5.2
Strike price of warrants (in usd per share) \| $ / shares		$ 137.85
Level 2
Debt Instrument
Fair value of Convertible Senior Notes \| $	$ 896.3		$ 994.8

Convertible Senior Notes (Components of Convertible Senior Notes) (Details) - USD ($) $ in Millions	Oct. 31, 2015	Jul. 31, 2015
Debt Instruments [Abstract]
Principal	$ 575.0	$ 575.0
Less: debt discount, net of amortization	82.7	87.9
Net carrying amount	492.3	487.1
Equity (including temporary equity)	$ (109.8)	$ (109.8)

Convertible Senior Notes (Schedule of Interest Expense Recognized) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Debt Disclosure [Abstract]
Amortization of debt discount	$ 5.2	$ 5.0
Amortization of debt issuance costs	0.5	0.5
Total interest expense recognized	$ 5.7	$ 5.5
Effective interest rate of the liability component (in percentage)	4.80%	4.80%

Commitments and Contingencies (New Lease Agreements) (Details) $ in Millions	Oct. 31, 2015 USD ($) ft²	May 31, 2015 ft²
Operating Leased Assets
Total future rental payments \| $	$ 508.5
Q415 New Lease Arrangements
Operating Leased Assets
Number of lease agreements		3
Area of additional office space		752,000
Q116 New Lease Arrangement
Operating Leased Assets
Number of lease agreements	1
Area of additional office space	310,000
Total future rental payments \| $	$ 101.2

Commitments and Contingencies (Lease Commitment) (Details) $ in Millions	Oct. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remaining 2016	$ 16.9
2017	25.1
2018	28.2
2019	41.9
2020	45.9
2021 and thereafter	350.5
Committed gross lease payments	508.5
Less: proceeds from sublease rental	7.4
Net operating lease obligation	$ 501.1

Commitments and Contingencies (Contract Manufacturer Commitments) (Details) $ in Millions	Oct. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contract manufacturer commitments	$ 46.3

Equity Award Plans (Stock Options Activity) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015
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)	(0.4)
Balance, ending (in shares)	2.9	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)	11.46
Balance, ending (in usd per share)	$ 14.06	$ 13.74
Options, Additional Disclosures
Weighted-Average Remaining Contractual Life (in years)	5 years 11 months	6 years 2 months
Aggregate Intrinsic Value	$ 420.2	$ 562.9
Options vested and expected to vest (in shares)	2.9
Options vested and expected to vest, Weighted-Average Exercise Price (in usd per share)	$ 14.04
Options vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	5 years 11 months
Options vested and expected to vest, Aggregate Intrinsic Value	$ 419.6
Options exercisable (in shares)	2.5
Options exercisable, Weighted-Average Exercise Price (in usd per share)	$ 12.89
Options exercisable, Weighted-Average Remaining Contractual Term (in years)	5 years 11 months
Options exercisable, Aggregate Intrinsic Value	$ 364.2

Equity Award Plans (Restricted Stock Units Award Activity) (Details) - Restricted stock units (RSUs) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015
RSUs, Outstanding Roll Forward
Balance, beginning (in shares)	7.2
RSUs granted (in shares)	0.4
RSUs vested (in shares)	(0.6)
RSUs forfeited (in shares)	(0.2)
Balance, ending (in shares)	6.8	7.2
RSUs, Outstanding, Weighted Average Grant-Date Fair Value Per Share Roll Forward
Balance, beginning (in usd per share)	$ 95.66
RSUs granted (in usd per share)	171.01
RSUs vested (in usd per share)	66.60
RSUs forfeited (in usd per share)	82.45
Balance, ending (in usd per share)	$ 103.05	$ 95.66
RSUs, Additional Disclosures
Weighted-Average Remaining Contractual Term (in years)	1 year 1 month	1 year 2 months
Aggregate Intrinsic Value	$ 1,101.0	$ 1,334.8
RSUs vested and expected to vest (in shares)	6.5
RSUs vested and expected to vest, Weighted-Average Grant-Date Fair Value (in usd per share)	$ 102.49
RSUs vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	1 year 1 month
RSUs vested and expected to vest, Aggregate Intrinsic Value	$ 1,046.0

Equity Award Plans (Allocation of Share Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 72.9	$ 38.5
Total compensation cost not yet recognized, unvested awards, net of estimated forfeitures	$ 570.9
Period for recognition of total compensation cost not yet recognized (in years)	3 years
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 1.3	0.7
Cost of services revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	7.0	3.5
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	25.0	14.0
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	27.2	15.8
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 12.4	$ 4.5

Income Taxes (Effective Tax Rates) (Details)	3 Months Ended
Income Taxes (Effective Tax Rates) (Details)	Oct. 31, 2015	Oct. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate (in percentage)	(12.20%)	(4.00%)

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
	Oct. 31, 2015	Oct. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method
Net loss	$ (38.7)	$ (30.1)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	85.1	79.4
Net loss per share, basic and diluted	$ (0.45)	$ (0.38)

- Definition

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

+ References + Details

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details) - shares shares in Millions	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	20.1	21.8
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	2.9	5.2
Restricted stock units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	6.8	6.2
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	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