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Document and Entity Information Document - shares	3 Months Ended
Document and Entity Information Document - shares	Oct. 31, 2016	Nov. 11, 2016
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, 2016
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Document Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		91,686,431

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Oct. 31, 2016	Jul. 31, 2016
Current assets:
Cash and cash equivalents	$ 839.4	$ 734.4
Short-term investments	550.6	551.2
Accounts receivable, net of allowance for doubtful accounts of $2.5 and $2.4 at October 31, 2016 and July 31, 2016, respectively	346.5	348.7
Prepaid expenses and other current assets	129.4	139.7
Total current assets	1,865.9	1,774.0
Property and equipment, net	125.0	117.2
Long-term investments	708.4	652.8
Goodwill	163.5	163.5
Intangible assets, net	41.7	44.0
Other assets	102.0	106.7
Total assets	3,006.5	2,858.2
Current liabilities:
Accounts payable	29.2	30.2
Accrued compensation	59.0	73.5
Accrued and other liabilities	48.4	39.2
Deferred revenue	758.1	703.9
Convertible senior notes, net	506.2	0.0
Total current liabilities	1,400.9	846.8
Convertible senior notes, net	0.0	500.2
Long-term deferred revenue	601.5	536.9
Other long-term liabilities	85.8	79.4
Commitments and contingencies (Note 6)
Temporary equity	61.4	0.0
Stockholders' equity:
Preferred stock; $0.0001 par value; 100.0 shares authorized; none issued and outstanding at October 31, 2016 and July 31, 2016	0.0	0.0
Common stock and additional paid-in capital; $0.0001 par value; 1,000.0 shares authorized; 91.7 and 90.5 shares issued and outstanding at October 31, 2016 and July 31, 2016, respectively	1,542.2	1,515.5
Accumulated other comprehensive income (loss)	(1.9)	1.0
Accumulated deficit	(683.4)	(621.6)
Total stockholders’ equity	856.9	894.9
Total liabilities, temporary equity, and stockholders’ equity	$ 3,006.5	$ 2,858.2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Oct. 31, 2016	Jul. 31, 2016
Current assets:
Allowance for doubtful accounts (in usd)	$ 2.5	$ 2.4
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)	91.7	90.5
Common stock, shares outstanding (in shares)	91.7	90.5

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Revenue:
Product	$ 163.8	$ 147.7
Subscription and support	234.3	149.5
Total revenue	398.1	297.2
Cost of revenue:
Product	42.2	38.8
Subscription and support	59.1	40.4
Total cost of revenue	101.3	79.2
Total gross profit	296.8	218.0
Operating expenses:
Research and development	84.6	59.7
Sales and marketing	220.3	159.5
General and administrative	41.8	30.8
Total operating expenses	346.7	250.0
Operating loss	(49.9)	(32.0)
Interest expense	(6.0)	(5.8)
Other income, net	2.5	2.2
Loss before income taxes	(53.4)	(35.6)
Provision for income taxes	8.4	4.3
Net loss	$ (61.8)	$ (39.9)
Net loss per share, basic and diluted	$ (0.69)	$ (0.47)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8	85.1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Net loss	$ (61.8)	$ (39.9)
Other comprehensive income (loss), net of tax:
Change in unrealized gains (losses) on investments	(1.8)	(0.3)
Change in unrealized gains (losses) on cash flow hedges	(1.1)	0.0
Comprehensive loss	$ (64.7)	$ (40.2)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Cash flows from operating activities
Net loss	$ (61.8)	$ (39.9)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation for equity based awards	114.2	72.9
Depreciation and amortization	13.6	9.2
Amortization of investment premiums, net of accretion of purchase discounts	0.7	0.8
Amortization of debt discount and debt issuance costs	6.0	5.7
Excess tax benefit from share-based compensation arrangements	(0.2)	(0.2)
Changes in operating assets and liabilities:
Accounts receivable, net	2.2	16.0
Prepaid expenses and other assets	10.1	7.3
Accounts payable	1.8	5.2
Accrued compensation	(14.5)	(27.0)
Accrued and other liabilities	12.4	5.9
Deferred revenue	118.8	90.8
Net cash provided by operating activities	203.3	146.7
Cash flows from investing activities
Purchases of investments	(285.7)	(512.5)
Proceeds from sales of investments	0.0	124.4
Proceeds from maturities of investments	235.4	144.1
Purchases of property, equipment, and other assets	(20.9)	(19.5)
Net cash used in investing activities	(71.2)	(263.5)
Cash flows from financing activities
Repurchases of common stock	(50.0)	0.0
Proceeds from sales of shares through employee equity incentive plans	22.7	16.6
Excess tax benefit from share-based compensation arrangements	0.2	0.2
Net cash provided by (used in) financing activities	(27.1)	16.8
Net increase (decrease) in cash and cash equivalents	105.0	(100.0)
Cash and cash equivalents—beginning of period	734.4	375.8
Cash and cash equivalents—end of period	$ 839.4	$ 275.8

Description of Business and Summary of Significant Accounting Policies

3 Months Ended

Oct. 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 and Principles of Consolidation

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, 2016, filed with the Securities and Exchange Commission on September 8, 2016. Our condensed consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Our 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 adjusted as a result of our voluntary change in accounting policy for sales commissions and our adoption of new accounting guidance related to debt issuance costs. Refer to “Summary of Significant Accounting Policies” and “Recent Accounting Pronouncements” below for more information.

Our 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, 2016.

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, 2016, as compared to the significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended July 31, 2016, except for our voluntary change in accounting policy related to sales commissions discussed below.

Change in Accounting Policy for Sales Commissions

Effective August 1, 2016, we voluntarily changed our accounting policy for sales commissions that are incremental and directly related to non-cancelable customer sales contracts from recording an expense when incurred to deferral and amortization of the sales commissions over the term of the related contract in proportion to the recognized revenue. We believe this change in accounting policy is preferable as the direct and incremental commission costs are closely related to the associated revenue, and therefore should be deferred and recognized as an expense over the same period that the related revenue is recognized.

Short-term deferred commissions are included in prepaid expenses and other current assets, while long-term deferred commissions are included in other assets in our condensed consolidated balance sheets. The amortization of deferred commissions is included in sales and marketing expense in our condensed consolidated statements of operations.

The adoption of this accounting policy change has been applied retrospectively to all prior periods presented in this Quarterly Report on Form 10-Q, in which the cumulative effect of the change of $71.8 million has been reflected in accumulated deficit as of August 1, 2015, the beginning of the earliest period presented.

The following tables present the changes to financial statement line items as a result of the accounting change for the periods presented in our condensed consolidated financial statements (in millions, except per share data):



	October 31, 2016								July 31, 2016
	Computed under Prior Method			Impact of Commission Adjustment		As Reported			As Previously Reported			Impact of Commission Adjustment		As Adjusted
Condensed Consolidated Balance Sheets
Prepaid expenses and other current assets	$	75.4		$	54.0	$	129.4		$	84.8		$	54.9	$	139.7
Other assets	53.6			48.4		102.0			64.6			50.1		114.7
Other long-term liabilities	85.0			0.8		85.8			79.4			—		79.4
Accumulated deficit	$	(785.0	)	$	101.6	$	(683.4	)	$	(726.6	)	$	105.0	$	(621.6	)



	Three Months Ended October 31, 2016									Three Months Ended October 31, 2015
	Computed under Prior Method			Impact of Commission Adjustment			As Reported			As Previously Reported			Impact of Commission Adjustment			As Adjusted
Condensed Consolidated Statements of Operations
Sales and marketing	$	217.7		$	2.6		$	220.3		$	158.3		$	1.2		$	159.5
Operating loss	(47.3		)	(2.6		)	(49.9		)	(30.8		)	(1.2		)	(32.0		)
Provision for income taxes	7.6			0.8			8.4			4.3			—			4.3
Net loss	$	(58.4	)	$	(3.4	)	$	(61.8	)	$	(38.7	)	$	(1.2	)	$	(39.9	)
Net loss per share, basic and diluted	$	(0.65	)	$	(0.04	)	$	(0.69	)	$	(0.45	)	$	(0.02	)	$	(0.47	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			—			89.8			85.1			—			85.1

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(58.4	)	$	(3.4	)	$	(61.8	)	$	(38.7	)	$	(1.2	)	$	(39.9	)
Comprehensive loss	$	(61.3	)	$	(3.4	)	$	(64.7	)	$	(39.0	)	$	(1.2	)	$	(40.2	)

This change in accounting policy does not affect our balance of cash and cash equivalents and, as a result, did not change net cash flows from operating, investing, or financing activities, or materially impact any individual line items presented in our condensed consolidated statement of cash flows for the three months ended October 31, 2015.

Recent Accounting Pronouncements

Recently Adopted 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. We adopted the guidance in our first quarter of fiscal 2017 on a prospective basis. Our adoption of this guidance did not 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. We adopted the guidance in our first quarter of fiscal 2017 on a retrospective basis, and as a result, we reduced other assets and convertible senior notes, net by $8.0 million on our condensed consolidated balance sheets as of July 31, 2016.

Recently Issued Accounting Pronouncements

In October 2016, the FASB issued authoritative guidance requiring the recognition of income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The standard is effective for us for our first quarter of fiscal 2019 and will be applied on a modified retrospective basis. Early adoption is permitted. We are currently evaluating whether this standard will have a material impact on our condensed consolidated financial statements.

In August 2016, the 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 condensed 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 condensed 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 condensed 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 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, 2016

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



	October 31, 2016								July 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Short-term investments:
Commercial paper	$	—	$	17.9	$	—	$	17.9	$	—	$	3.0	$	—	$	3.0
Corporate debt securities	—		110.3		—		110.3		—		121.4		—		121.4
U.S. government and agency securities	—		422.4		—		422.4		—		426.8		—		426.8
Total short-term investments	—		550.6		—		550.6		—		551.2		—		551.2
Long-term investments:
Certificates of deposit	—		5.4		—		5.4		—		5.4		—		5.4
Corporate debt securities	—		188.7		—		188.7		—		166.1		—		166.1
U.S. government and agency securities	—		514.3		—		514.3		—		481.3		—		481.3
Total long-term investments	—		708.4		—		708.4		—		652.8		—		652.8
Total assets measured at fair value	$	—	$	1,259.0	$	—	$	1,259.0	$	—	$	1,204.0	$	—	$	1,204.0
Accrued and other liabilities:
Foreign currency forward contracts	$	—	$	1.2	$	—	$	1.2	$	—	$	—	$	—	$	—
Total accrued and other liabilities	—		1.2		—		1.2		—		—		—		—
Total liabilities measured at fair value	$	—	$	1.2	$	—	$	1.2	$	—	$	—	$	—	$	—

Refer to Note 5. Convertible Senior Notes for the carrying amount and estimated fair value of our convertible senior notes as of October 31, 2016 and July 31, 2016.

- 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, 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 October 31, 2016 and July 31, 2016 (in millions):



	October 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	5.4	$	—	$	—		$	5.4
Commercial paper	17.9		—		—			17.9
Corporate debt securities	298.9		0.4		(0.3		)	299.0
U.S. government and agency securities	937.0		0.3		(0.6		)	936.7
Total	$	1,259.2	$	0.7	$	(0.9	)	$	1,259.0



	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

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, 2016 and July 31, 2016.

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



	Amortized Cost		Fair Value
Due within one year	$	550.5	$	550.6
Due between one and three years	708.7		708.4
Total	$	1,259.2	$	1,259.0

- Definition

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

+ References + Details

Derivative Instruments	3 Months Ended
Derivative Instruments	Oct. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	4. Derivative Instruments As a global business, we are exposed to currency exchange rate risk. Substantially all of our revenue is transacted in U.S. dollars, however, a portion of our operating expenditures are incurred outside of the United States and are denominated in foreign currencies, making them subject to fluctuations in foreign currency exchange rates. We enter into foreign currency derivative contracts with maturities of 12 months or less which we designate as cash flow hedges to manage the foreign currency exchange rate risk associated with these expenditures. These derivative contracts expose us to credit risk to the extent that the counterparties may be unable to meet the terms of the arrangement. We mitigate this credit risk by transacting with major financial institutions with high credit ratings and also enter into master netting arrangements, which permit net settlement of transactions with the same counterparty. We are not required to pledge, and are not entitled to receive, cash collateral related to these derivative instruments. We do not enter into derivative contracts for trading or speculative purposes. Our derivative financial instruments are recorded at fair value, on a gross basis, as either assets or liabilities in our condensed consolidated balance sheets. Gains or losses related to the effective portion of our cash flow hedges are recorded as a component of accumulated other comprehensive income (“AOCI”) in our condensed consolidated balance sheets and are reclassified into the financial statement line item associated with the underlying hedged transaction in our condensed consolidated statements of operations when the underlying hedged transaction is recognized in earnings. Any gains or losses related to the ineffective portion of our cash flow hedges are recorded immediately in other income (expense), net in our condensed consolidated statements of operations. If it becomes probable that the hedged transaction will not occur, the cumulative unrealized gain or loss is reclassified immediately from AOCI into other income (expense), net. Gains or losses related to non-designated derivative instruments are recognized in other income (expense), net each period until the instrument matures, is terminated, is re-designated as a qualified cash flow hedge, or is sold. Derivatives designated as cash flow hedges are classified in our condensed consolidated statements of cash flows in the same manner as the underlying hedged transaction, primarily within cash flows from operating activities. In August 2016, we entered into forward contracts to hedge the foreign currency exchange rate risk arising from our euro-denominated expenditures to be incurred during the fiscal year ending July 31, 2017. These forward contracts were designated as cash flow hedges. As of October 31, 2016, the total notional amount of our outstanding foreign currency forward contracts was $63.8 million. Refer to Note 2. Fair Value Measurements for the total estimated fair value of our derivative instruments as of October 31, 2016. During the three months ended October 31, 2016, we accumulated unrealized losses of $1.1 million in AOCI related to the effective portion of our cash flow hedges, substantially all of which we expect to be reclassified into earnings within the next 12 months. The amounts reclassified into earnings related to our cash flow hedges were not significant for the three months ended October 31, 2016.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Convertible Senior Notes

3 Months Ended

Oct. 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 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; 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 not met during the fiscal quarter ended July 31, 2016. Since the Notes were not convertible, the net carrying amount of the Notes and related debt issuance costs were classified as long-term liabilities and the equity component was included in additional paid-in capital in our condensed consolidated balance sheets as of July 31, 2016. The sale price condition was met during the fiscal quarter ended October 31, 2016, and as a result, holders may convert their Notes at any time during the fiscal quarter ending January 31, 2017. Accordingly, the net carrying amount of the Notes and related debt issuance costs were reclassified into current liabilities and the portion of the equity component representing the conversion option was reclassified into temporary equity in our condensed consolidated balance sheets as of October 31, 2016. 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, excluding debt issuance costs.

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



	October 31, 2016		July 31, 2016
Liability:
Principal	$	575.0	$	575.0
Less: debt discount and debt issuance costs, net of amortization	68.8		74.8
Net carrying amount	$	506.2	$	500.2

Equity (including temporary equity)	$	109.8	$	109.8

The total estimated fair value of the Notes was $851.0 million and $761.9 million at October 31, 2016 and July 31, 2016, 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, 2016 and July 31, 2016 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, 2016, the if-converted value of the Notes exceeded its principal amount by $223.6 million.

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



	Three Months Ended October 31,
	2016			2015
Amortization of debt discount	$	5.4		$	5.2
Amortization of debt issuance costs	0.6			0.5
Total interest expense recognized	$	6.0		$	5.7

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 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.

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, 2016.

Commitments and Contingencies

3 Months Ended

Oct. 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.

The following table presents details of the aggregate future non-cancelable minimum rental payments under our operating leases as of October 31, 2016 (in millions):



	Amount
Fiscal years ending July 31:
Remaining 2017	$	20.6
2018	27.2
2019	46.5
2020	50.2
2021	55.0
2022 and thereafter	316.6
Committed gross lease payments	516.1
Less: proceeds from sublease rental	4.4
Net operating lease obligation	$	511.7

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, 2016, our purchase commitments under such orders were $63.9 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, 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.

Stockholders' Equity	3 Months Ended
Stockholders' Equity	Oct. 31, 2016
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity 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. During the three months ended October 31, 2016, we repurchased and retired 0.3 million shares of our common stock under the authorization for an aggregate purchase price of $50.0 million. The total price of the shares repurchased and related transaction costs are reflected as a reduction to common stock and additional paid-in capital on our condensed consolidated balance sheets. As of October 31, 2016, $450.0 million remained available for future share repurchases under the repurchase authorization.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Equity Award Plans

3 Months Ended

Oct. 31, 2016

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

Equity Award Plans

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, 2016	2.1		$	13.42	5.2	$	244.9
Options granted	—		—
Options forfeited	—		—
Options exercised	(0.3	)	15.93
Balance—October 31, 2016	1.8		$	13.01	4.9	$	253.1
Options vested and expected to vest—October 31, 2016	1.8		$	13.01	4.9	$	253.1
Options exercisable—October 31, 2016	1.8		$	13.01	4.9	$	253.1

Restricted Stock Unit (“RSU”), Restricted Stock Award (“RSA”), and Performance-Based Stock Award (“PSA”) Activities

During the three months ended October 31, 2016, we granted PSAs to our employees, which will vest over a period of four years from the date of grant. The actual number of PSAs earned and eligible to vest will be determined based on level of achievement against a pre-established billings target for the fiscal year ending July 31, 2017, with a maximum of 0.2 million shares issuable at the end of the performance period. Share-based compensation expense for our PSAs is recognized, net of estimated forfeitures, on a straight-line basis over the requisite service period for each separately vesting portion of the award when it is probable that the performance condition will be achieved.

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



	RSAs and PSAs 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, 2016	1.1	$	170.97	6.5		$	130.14	1.1	$	852.7
Granted⁽¹⁾	0.3	148.54		2.0		147.51
Vested	—	—		(0.7	)	98.49
Forfeited	—	—		(0.1	)	140.21
Balance—October 31, 2016	1.4	$	165.81	7.7		$	137.59	1.3	$	1,187.5
Expected to vest—October 31, 2016	1.4	$	166.55	7.3		$	137.19	1.3	$	1,119.0

______________


(1)	The number of PSAs granted represents the aggregate maximum number of shares that may be earned and issued with respect to these awards over their full terms.

Share-Based Compensation

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



	Three Months Ended October 31,
	2016		2015
Cost of product revenue	$	1.7	$	1.3
Cost of subscription and support revenue	12.4		7.0
Research and development	38.4		25.0
Sales and marketing	44.0		27.2
General and administrative	17.7		12.4
Total share-based compensation	$	114.2	$	72.9

At October 31, 2016, total compensation cost related to unvested share-based awards not yet recognized was $1.0 billion, net of estimated forfeitures. This cost is expected to be amortized on a straight-line basis over a weighted-average period of approximately 2.7 years.

- 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	3 Months Ended
Income Taxes	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our provision for income taxes for the three months ended October 31, 2016 reflects an effective tax rate of (15.7)%. 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. Our effective tax rate differs from the U.S. statutory tax rate primarily due to 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 and changes in our valuation allowance against deferred tax assets. Our provision for income taxes for the three months ended October 31, 2015 reflects an effective tax rate of (12.1)%. 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 consisted 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 consisted 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, 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):



	Three Months Ended
	October 31,
	2016			2015
Net loss	$	(61.8	)	$	(39.9	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			85.1
Net loss per share, basic and diluted	$	(0.69	)	$	(0.47	)

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):



	Three Months Ended
	October 31,
	2016	2015
RSUs	7.7	6.8
Convertible senior notes	5.2	5.2
Warrants related to the issuance of convertible senior notes	5.2	5.2
Options to purchase common stock	1.8	2.9
RSAs and PSAs	1.4	—
Total	21.3	20.1

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

3 Months Ended

Oct. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Principles of Consolidation

Change in Accounting Policy for Sales Commissions



	October 31, 2016								July 31, 2016
	Computed under Prior Method			Impact of Commission Adjustment		As Reported			As Previously Reported			Impact of Commission Adjustment		As Adjusted
Condensed Consolidated Balance Sheets
Prepaid expenses and other current assets	$	75.4		$	54.0	$	129.4		$	84.8		$	54.9	$	139.7
Other assets	53.6			48.4		102.0			64.6			50.1		114.7
Other long-term liabilities	85.0			0.8		85.8			79.4			—		79.4
Accumulated deficit	$	(785.0	)	$	101.6	$	(683.4	)	$	(726.6	)	$	105.0	$	(621.6	)



	Three Months Ended October 31, 2016									Three Months Ended October 31, 2015
	Computed under Prior Method			Impact of Commission Adjustment			As Reported			As Previously Reported			Impact of Commission Adjustment			As Adjusted
Condensed Consolidated Statements of Operations
Sales and marketing	$	217.7		$	2.6		$	220.3		$	158.3		$	1.2		$	159.5
Operating loss	(47.3		)	(2.6		)	(49.9		)	(30.8		)	(1.2		)	(32.0		)
Provision for income taxes	7.6			0.8			8.4			4.3			—			4.3
Net loss	$	(58.4	)	$	(3.4	)	$	(61.8	)	$	(38.7	)	$	(1.2	)	$	(39.9	)
Net loss per share, basic and diluted	$	(0.65	)	$	(0.04	)	$	(0.69	)	$	(0.45	)	$	(0.02	)	$	(0.47	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			—			89.8			85.1			—			85.1

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(58.4	)	$	(3.4	)	$	(61.8	)	$	(38.7	)	$	(1.2	)	$	(39.9	)
Comprehensive loss	$	(61.3	)	$	(3.4	)	$	(64.7	)	$	(39.0	)	$	(1.2	)	$	(40.2	)

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Recently Issued 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.

Derivative Instruments

As a global business, we are exposed to currency exchange rate risk. Substantially all of our revenue is transacted in U.S. dollars, however, a portion of our operating expenditures are incurred outside of the United States and are denominated in foreign currencies, making them subject to fluctuations in foreign currency exchange rates. We enter into foreign currency derivative contracts with maturities of 12 months or less which we designate as cash flow hedges to manage the foreign currency exchange rate risk associated with these expenditures.

These derivative contracts expose us to credit risk to the extent that the counterparties may be unable to meet the terms of the arrangement. We mitigate this credit risk by transacting with major financial institutions with high credit ratings and also enter into master netting arrangements, which permit net settlement of transactions with the same counterparty. We are not required to pledge, and are not entitled to receive, cash collateral related to these derivative instruments. We do not enter into derivative contracts for trading or speculative purposes.

Our derivative financial instruments are recorded at fair value, on a gross basis, as either assets or liabilities in our condensed consolidated balance sheets. Gains or losses related to the effective portion of our cash flow hedges are recorded as a component of accumulated other comprehensive income (“AOCI”) in our condensed consolidated balance sheets and are reclassified into the financial statement line item associated with the underlying hedged transaction in our condensed consolidated statements of operations when the underlying hedged transaction is recognized in earnings. Any gains or losses related to the ineffective portion of our cash flow hedges are recorded immediately in other income (expense), net in our condensed consolidated statements of operations. If it becomes probable that the hedged transaction will not occur, the cumulative unrealized gain or loss is reclassified immediately from AOCI into other income (expense), net. Gains or losses related to non-designated derivative instruments are recognized in other income (expense), net each period until the instrument matures, is terminated, is re-designated as a qualified cash flow hedge, or is sold. Derivatives designated as cash flow hedges are classified in our condensed consolidated statements of cash flows in the same manner as the underlying hedged transaction, primarily within cash flows from operating activities.

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

3 Months Ended

Oct. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Changes in Accounting Principles



	October 31, 2016								July 31, 2016
	Computed under Prior Method			Impact of Commission Adjustment		As Reported			As Previously Reported			Impact of Commission Adjustment		As Adjusted
Condensed Consolidated Balance Sheets
Prepaid expenses and other current assets	$	75.4		$	54.0	$	129.4		$	84.8		$	54.9	$	139.7
Other assets	53.6			48.4		102.0			64.6			50.1		114.7
Other long-term liabilities	85.0			0.8		85.8			79.4			—		79.4
Accumulated deficit	$	(785.0	)	$	101.6	$	(683.4	)	$	(726.6	)	$	105.0	$	(621.6	)



	Three Months Ended October 31, 2016									Three Months Ended October 31, 2015
	Computed under Prior Method			Impact of Commission Adjustment			As Reported			As Previously Reported			Impact of Commission Adjustment			As Adjusted
Condensed Consolidated Statements of Operations
Sales and marketing	$	217.7		$	2.6		$	220.3		$	158.3		$	1.2		$	159.5
Operating loss	(47.3		)	(2.6		)	(49.9		)	(30.8		)	(1.2		)	(32.0		)
Provision for income taxes	7.6			0.8			8.4			4.3			—			4.3
Net loss	$	(58.4	)	$	(3.4	)	$	(61.8	)	$	(38.7	)	$	(1.2	)	$	(39.9	)
Net loss per share, basic and diluted	$	(0.65	)	$	(0.04	)	$	(0.69	)	$	(0.45	)	$	(0.02	)	$	(0.47	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			—			89.8			85.1			—			85.1

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(58.4	)	$	(3.4	)	$	(61.8	)	$	(38.7	)	$	(1.2	)	$	(39.9	)
Comprehensive loss	$	(61.3	)	$	(3.4	)	$	(64.7	)	$	(39.0	)	$	(1.2	)	$	(40.2	)

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=66092750

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

+ Details

Fair Value Measurements (Tables)

3 Months Ended

Oct. 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 October 31, 2016 and July 31, 2016 (in millions):



	October 31, 2016								July 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Short-term investments:
Commercial paper	$	—	$	17.9	$	—	$	17.9	$	—	$	3.0	$	—	$	3.0
Corporate debt securities	—		110.3		—		110.3		—		121.4		—		121.4
U.S. government and agency securities	—		422.4		—		422.4		—		426.8		—		426.8
Total short-term investments	—		550.6		—		550.6		—		551.2		—		551.2
Long-term investments:
Certificates of deposit	—		5.4		—		5.4		—		5.4		—		5.4
Corporate debt securities	—		188.7		—		188.7		—		166.1		—		166.1
U.S. government and agency securities	—		514.3		—		514.3		—		481.3		—		481.3
Total long-term investments	—		708.4		—		708.4		—		652.8		—		652.8
Total assets measured at fair value	$	—	$	1,259.0	$	—	$	1,259.0	$	—	$	1,204.0	$	—	$	1,204.0
Accrued and other liabilities:
Foreign currency forward contracts	$	—	$	1.2	$	—	$	1.2	$	—	$	—	$	—	$	—
Total accrued and other liabilities	—		1.2		—		1.2		—		—		—		—
Total liabilities measured at fair value	$	—	$	1.2	$	—	$	1.2	$	—	$	—	$	—	$	—

- 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)

3 Months Ended

Oct. 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 October 31, 2016 and July 31, 2016 (in millions):



	October 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	5.4	$	—	$	—		$	5.4
Commercial paper	17.9		—		—			17.9
Corporate debt securities	298.9		0.4		(0.3		)	299.0
U.S. government and agency securities	937.0		0.3		(0.6		)	936.7
Total	$	1,259.2	$	0.7	$	(0.9	)	$	1,259.0



	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

Schedule of 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, 2016, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	550.5	$	550.6
Due between one and three years	708.7		708.4
Total	$	1,259.2	$	1,259.0

- 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

Convertible Senior Notes (Tables)

3 Months Ended

Oct. 31, 2016

Debt Disclosure [Abstract]

Components of Convertible Senior Notes

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



	October 31, 2016		July 31, 2016
Liability:
Principal	$	575.0	$	575.0
Less: debt discount and debt issuance costs, net of amortization	68.8		74.8
Net carrying amount	$	506.2	$	500.2

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,
	2016			2015
Amortization of debt discount	$	5.4		$	5.2
Amortization of debt issuance costs	0.6			0.5
Total interest expense recognized	$	6.0		$	5.7

Effective interest rate of the liability component	4.8		%	4.8		%

Commitments and Contingencies (Tables)

3 Months Ended

Oct. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of future non-cancelable 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, 2016 (in millions):



	Amount
Fiscal years ending July 31:
Remaining 2017	$	20.6
2018	27.2
2019	46.5
2020	50.2
2021	55.0
2022 and thereafter	316.6
Committed gross lease payments	516.1
Less: proceeds from sublease rental	4.4
Net operating lease obligation	$	511.7

Equity Award Plans (Tables)

3 Months Ended

Oct. 31, 2016

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

Schedule of 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, 2016	2.1		$	13.42	5.2	$	244.9
Options granted	—		—
Options forfeited	—		—
Options exercised	(0.3	)	15.93
Balance—October 31, 2016	1.8		$	13.01	4.9	$	253.1
Options vested and expected to vest—October 31, 2016	1.8		$	13.01	4.9	$	253.1
Options exercisable—October 31, 2016	1.8		$	13.01	4.9	$	253.1

Schedule of restricted stock unit (“RSU”), restricted stock award (“RSA”), and performance-based stock award (“PSA”) activities

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



	RSAs and PSAs 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, 2016	1.1	$	170.97	6.5		$	130.14	1.1	$	852.7
Granted⁽¹⁾	0.3	148.54		2.0		147.51
Vested	—	—		(0.7	)	98.49
Forfeited	—	—		(0.1	)	140.21
Balance—October 31, 2016	1.4	$	165.81	7.7		$	137.59	1.3	$	1,187.5
Expected to vest—October 31, 2016	1.4	$	166.55	7.3		$	137.19	1.3	$	1,119.0

______________


(1)	The number of PSAs granted represents the aggregate maximum number of shares that may be earned and issued with respect to these awards over their full terms.

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,
	2016		2015
Cost of product revenue	$	1.7	$	1.3
Cost of subscription and support revenue	12.4		7.0
Research and development	38.4		25.0
Sales and marketing	44.0		27.2
General and administrative	17.7		12.4
Total share-based compensation	$	114.2	$	72.9

Net Income (Loss) Per Share (Tables)

3 Months Ended

Oct. 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):



	Three Months Ended
	October 31,
	2016			2015
Net loss	$	(61.8	)	$	(39.9	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			85.1
Net loss per share, basic and diluted	$	(0.69	)	$	(0.47	)

Schedule of antidilutive securities excluded from the 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):



	Three Months Ended
	October 31,
	2016	2015
RSUs	7.7	6.8
Convertible senior notes	5.2	5.2
Warrants related to the issuance of convertible senior notes	5.2	5.2
Options to purchase common stock	1.8	2.9
RSAs and PSAs	1.4	—
Total	21.3	20.1

Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2016	Aug. 01, 2015
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	$ 129.4		$ 139.7
Other assets	102.0		106.7
Other long-term liabilities	85.8		79.4
Accumulated deficit	(683.4)		(621.6)
Sales and marketing	220.3	$ 159.5
Operating loss	(49.9)	(32.0)
Provision for income taxes	8.4	4.3
Net loss	$ (61.8)	$ (39.9)
Net loss per share, basic and diluted	$ (0.69)	$ (0.47)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8	85.1
Comprehensive loss	$ (64.7)	$ (40.2)
Convertible senior notes, net	0.0		500.2
Accounting policy for sales commissions
New Accounting Pronouncements or Change in Accounting Principle
Change in accounting principle, cumulative effect of change on accumulated deficit				$ 71.8
Prepaid expenses and other current assets	129.4		139.7
Other assets	102.0		114.7
Other long-term liabilities	85.8		79.4
Accumulated deficit	(683.4)		(621.6)
Sales and marketing	220.3	159.5
Operating loss	(49.9)	(32.0)
Provision for income taxes	8.4	4.3
Net loss	$ (61.8)	$ (39.9)
Net loss per share, basic and diluted	$ (0.69)	$ (0.47)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8	85.1
Comprehensive loss	$ (64.7)	$ (40.2)
Accounting policy for sales commissions \| As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	75.4		84.8
Other assets	53.6		64.6
Other long-term liabilities	85.0		79.4
Accumulated deficit	(785.0)		(726.6)
Sales and marketing	217.7	158.3
Operating loss	(47.3)	(30.8)
Provision for income taxes	7.6	4.3
Net loss	$ (58.4)	$ (38.7)
Net loss per share, basic and diluted	$ (0.65)	$ (0.45)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8	85.1
Comprehensive loss	$ (61.3)	$ (39.0)
Accounting policy for sales commissions \| Impact of Change in Accounting Principle
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	54.0		54.9
Other assets	48.4		50.1
Other long-term liabilities	0.8		0.0
Accumulated deficit	101.6		105.0
Sales and marketing	2.6	1.2
Operating loss	(2.6)	(1.2)
Provision for income taxes	0.8	0.0
Net loss	$ (3.4)	$ (1.2)
Net loss per share, basic and diluted	$ (0.04)	$ (0.02)
Weighted-average shares used to compute net loss per share, basic and diluted	0.0	0.0
Comprehensive loss	$ (3.4)	$ (1.2)
New Accounting Pronouncement - Presentation of Debt Issuance Costs \| Impact of Change in Accounting Principle
New Accounting Pronouncements or Change in Accounting Principle
Other assets			(8.0)
Convertible senior notes, net			$ (8.0)

Fair Value Measurements (Details) - USD ($) $ in Millions	Oct. 31, 2016	Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	$ 550.6	$ 551.2
Long-term investments	708.4	652.8
Total assets measured at fair value	1,259.0	1,204.0
Accrued and other liabilities	1.2	0.0
Total liabilities measured at fair value	1.2	0.0
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
Accrued and other liabilities	0.0	0.0
Total liabilities measured at fair value	0.0	0.0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	550.6	551.2
Long-term investments	708.4	652.8
Total assets measured at fair value	1,259.0	1,204.0
Accrued and other liabilities	1.2	0.0
Total liabilities measured at fair value	1.2	0.0
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
Accrued and other liabilities	0.0	0.0
Total liabilities measured at fair value	0.0	0.0
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	17.9	3.0
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	17.9	3.0
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	110.3	121.4
Long-term investments	188.7	166.1
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	110.3	121.4
Long-term investments	188.7	166.1
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	422.4	426.8
Long-term investments	514.3	481.3
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	422.4	426.8
Long-term investments	514.3	481.3
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
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term investments	5.4	5.4
Certificates of deposit \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term investments	0.0	0.0
Certificates of deposit \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term investments	5.4	5.4
Certificates of deposit \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term investments	0.0	0.0
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Accrued and other liabilities	1.2	0.0
Foreign currency forward contracts \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Accrued and other liabilities	0.0	0.0
Foreign currency forward contracts \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Accrued and other liabilities	1.2	0.0
Foreign currency forward contracts \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Accrued and other liabilities	$ 0.0	$ 0.0

Investments (Available-for-Sale Investments) (Details) - USD ($) $ in Millions	Oct. 31, 2016	Jul. 31, 2016
Schedule of Available-for-sale Securities
Amortized cost	$ 1,259.2	$ 1,202.4
Unrealized gains	0.7	1.7
Unrealized losses	(0.9)	(0.1)
Estimated fair value	1,259.0	1,204.0
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized cost	5.4	5.4
Unrealized gains	0.0	0.0
Unrealized losses	0.0	0.0
Estimated fair value	5.4	5.4
Commercial paper
Schedule of Available-for-sale Securities
Amortized cost	17.9	3.0
Unrealized gains	0.0	0.0
Unrealized losses	0.0	0.0
Estimated fair value	17.9	3.0
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized cost	298.9	286.7
Unrealized gains	0.4	0.8
Unrealized losses	(0.3)	0.0
Estimated fair value	299.0	287.5
U.S. government and agency securities
Schedule of Available-for-sale Securities
Amortized cost	937.0	907.3
Unrealized gains	0.3	0.9
Unrealized losses	(0.6)	(0.1)
Estimated fair value	$ 936.7	$ 908.1

Investments (Available-for-Sale Investments, Contractual Maturities) (Details) - USD ($) $ in Millions	Oct. 31, 2016	Jul. 31, 2016
Amortized Cost
Due within one year	$ 550.5
Due between one and three years	708.7
Total	1,259.2
Fair Value
Due within one year	550.6
Due between one and three years	708.4
Total	$ 1,259.0	$ 1,204.0

Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
Derivative Instruments (Details) - USD ($) $ in Millions	Oct. 31, 2016	Oct. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maximum contract term of cash flow hedge (in months)	12 months
Notional amount of derivatives	$ 63.8
Accumulated unrealized losses related to the effective portion of cash flow hedges	$ 1.1	$ 0.0

Convertible Senior Notes (Additional Information) (Details) $ / shares in Units, shares in Millions, $ in Millions	Oct. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) shares $ / shares	Jul. 31, 2016 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 (in days)		5
Convertible Senior Notes, threshold consecutive trading days, per $1,000 principal (in days)		5 days
Convertible Senior Notes, threshold percentage of Note price trigger, per $1,000 principal (in percentage)		98.00%
If-converted value in excess of principal \| $	$ 223.6
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 \| $	$ 851.0		$ 761.9

Convertible Senior Notes (Components of Convertible Senior Notes) (Details) - USD ($) $ in Millions	Oct. 31, 2016	Jul. 31, 2016
Debt Instruments [Abstract]
Principal	$ 575.0	$ 575.0
Less: debt discount and debt issuance costs, net of amortization	68.8	74.8
Net carrying amount	506.2	500.2
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, 2016	Oct. 31, 2015
Debt Disclosure [Abstract]
Amortization of debt discount	$ 5.4	$ 5.2
Amortization of debt issuance costs	0.6	0.5
Total interest expense recognized	$ 6.0	$ 5.7
Effective interest rate of the liability component (in percentage)	4.80%	4.80%

Commitments and Contingencies (Lease Commitment) (Details) $ in Millions	Oct. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remaining 2017	$ 20.6
2018	27.2
2019	46.5
2020	50.2
2021	55.0
2022 and thereafter	316.6
Committed gross lease payments	516.1
Less: proceeds from sublease rental	4.4
Net operating lease obligation	$ 511.7

Commitments and Contingencies (Contract Manufacturer Commitments) (Details) $ in Millions	Oct. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contract manufacturer commitments	$ 63.9

Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Oct. 31, 2016	Aug. 26, 2016
Equity [Abstract]
Stock repurchase program, authorized amount		$ 500.0
Stock repurchased and retired during the period (in shares)	0.3
Stock repurchased and retired during period, value	$ 50.0
Stock repurchase program, remaining authorized repurchase amount	$ 450.0

Equity Award Plans (Stock Option Activities) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016
Options, Outstanding Roll Forward
Balance, beginning (in shares)	2.1
Options granted (in shares)	0.0
Options forfeited (in shares)	0.0
Options exercised (in shares)	(0.3)
Balance, ending (in shares)	1.8	2.1
Options, Outstanding, Weighted Average Exercise Price Roll Forward
Balance, beginning (in usd per share)	$ 13.42
Options granted (in usd per share)	0.00
Options forfeited (in usd per share)	0.00
Options exercised (in usd per share)	15.93
Balance, ending (in usd per share)	$ 13.01	$ 13.42
Options, Additional Disclosures
Weighted-average remaining contractual life (in years)	4 years 11 months	5 years 2 months
Aggregate intrinsic value	$ 253.1	$ 244.9
Options vested and expected to vest (in shares)	1.8
Options vested and expected to vest, weighted-average exercise price (in usd per share)	$ 13.01
Options vested and expected to vest, weighted-average remaining contractual term (in years)	4 years 11 months
Options vested and expected to vest, aggregate intrinsic value	$ 253.1
Options exercisable (in shares)	1.8
Options exercisable, weighted-average exercise price (in usd per share)	$ 13.01
Options exercisable, weighted-average remaining contractual term (in years)	4 years 11 months
Options exercisable, aggregate intrinsic value	$ 253.1

Equity Award Plans (Restricted Stock Unit, Restricted Stock Award, and Performance-Based Stock Award Activities) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016
Restricted stock awards (RSAs) and performance-based stock awards (PSAs)
Restricted Stock Unit (RSU), Restricted Stock Award (RSA), and Performance-Based Stock Award (PSA), Outstanding Roll Forward
Balance, beginning (in shares)	1.1
Vested (in shares)	0.0
Forfeited (in shares)	0.0
Balance, ending (in shares)	1.4	1.1
RSUs, RSAs, and PSAs, Outstanding, Weighted Average Grant-Date Fair Value Per Share Roll Forward
Balance, beginning (in usd per share)	$ 170.97
Granted (in usd per share)	148.54
Vested (in usd per share)	0.00
Forfeited (in usd per share)	0.00
Balance, ending (in usd per share)	$ 165.81	$ 170.97
RSUs, RSAs, and PSAs, Additional Disclosures
Vested and expected to vest (in shares)	1.4
Vested and expected to vest, weighted-average grant-date fair value (in usd per share)	$ 166.55
Restricted stock units (RSUs)
Restricted Stock Unit (RSU), Restricted Stock Award (RSA), and Performance-Based Stock Award (PSA), Outstanding Roll Forward
Balance, beginning (in shares)	6.5
Granted (in shares)	2.0
Vested (in shares)	(0.7)
Forfeited (in shares)	(0.1)
Balance, ending (in shares)	7.7	6.5
RSUs, RSAs, and PSAs, Outstanding, Weighted Average Grant-Date Fair Value Per Share Roll Forward
Balance, beginning (in usd per share)	$ 130.14
Granted (in usd per share)	147.51
Vested (in usd per share)	98.49
Forfeited (in usd per share)	140.21
Balance, ending (in usd per share)	$ 137.59	$ 130.14
RSUs, RSAs, and PSAs, Additional Disclosures
Weighted-average remaining contractual term (in years)	1 year 4 months	1 year 1 month
Aggregate intrinsic value	$ 1,187.5	$ 852.7
Vested and expected to vest (in shares)	7.3
Vested and expected to vest, weighted-average grant-date fair value (in usd per share)	$ 137.19
Vested and expected to vest, weighted-average remaining contractual term (in years)	1 year 4 months
Vested and expected to vest, aggregate intrinsic value	$ 1,119.0
Maximum \| Performance-based stock awards (PSAs)
Restricted Stock Unit (RSU), Restricted Stock Award (RSA), and Performance-Based Stock Award (PSA), Outstanding Roll Forward
Granted (in shares)	0.2
Maximum \| Restricted stock awards (RSAs) and performance-based stock awards (PSAs)
Restricted Stock Unit (RSU), Restricted Stock Award (RSA), and Performance-Based Stock Award (PSA), Outstanding Roll Forward
Granted (in shares)	0.3

Equity Award Plans (Allocation of Share Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 114.2	$ 72.9
Total compensation cost not yet recognized, unvested awards, net of estimated forfeitures	$ 1,000.0
Period for recognition of total compensation cost not yet recognized (in years)	2 years 8 months
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 1.7	1.3
Cost of subscription and support revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	12.4	7.0
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	38.4	25.0
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	44.0	27.2
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 17.7	$ 12.4

Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate (in percentage)	(15.70%)	(12.10%)

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, 2016	Oct. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method
Net loss	$ (61.8)	$ (39.9)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8	85.1
Net loss per share, basic and diluted	$ (0.69)	$ (0.47)

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details) - shares shares in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	21.3	20.1
Restricted stock units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	7.7	6.8
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
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	1.8	2.9
Restricted stock awards (RSAs) and performance-based stock awards (PSAs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	1.4	0.0