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Document and Entity Information Document - shares	9 Months Ended
Document and Entity Information Document - shares	Apr. 30, 2017	May 17, 2017
Document Information [Abstract]
Entity Registrant Name	Palo Alto Networks Inc
Entity Central Index Key	0001327567
Document Type	10-Q
Document Period End Date	Apr. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Document Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		91,823,907

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Current assets:
Cash and cash equivalents	$ 692.0	$ 734.4
Short-term investments	680.0	551.2
Accounts receivable, net of allowance for doubtful accounts of $0.7 and $2.4 at April 30, 2017 and July 31, 2016, respectively	364.1	348.7
Prepaid expenses and other current assets	159.1	139.7
Total current assets	1,895.2	1,774.0
Property and equipment, net	192.3	117.2
Long-term investments	719.1	652.8
Goodwill	238.8	163.5
Intangible assets, net	56.5	44.0
Other assets	148.2	106.7
Total assets	3,250.1	2,858.2
Current liabilities:
Accounts payable	33.2	30.2
Accrued compensation	76.4	73.5
Accrued and other liabilities	60.1	39.2
Deferred revenue	885.0	703.9
Total current liabilities	1,054.7	846.8
Convertible senior notes, net	518.4	500.2
Long-term deferred revenue	726.8	536.9
Other long-term liabilities	137.1	79.4
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock; $0.0001 par value; 100.0 shares authorized; none issued and outstanding at April 30, 2017 and July 31, 2016	0.0	0.0
Common stock and additional paid-in capital; $0.0001 par value; 1,000.0 shares authorized; 91.8 and 90.5 shares issued and outstanding at April 30, 2017 and July 31, 2016, respectively	1,615.8	1,515.5
Accumulated other comprehensive income (loss)	(4.2)	1.0
Accumulated deficit	(798.5)	(621.6)
Total stockholders’ equity	813.1	894.9
Total liabilities and stockholders’ equity	$ 3,250.1	$ 2,858.2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Current assets:
Allowance for doubtful accounts (in usd)	$ 0.7	$ 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)	91.8	90.5
Common stock, shares outstanding (in shares)	91.8	90.5

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Revenue:
Product	$ 164.2	$ 162.1	$ 496.8	$ 479.7
Subscription and support	267.6	183.7	755.7	498.0
Total revenue	431.8	345.8	1,252.5	977.7
Cost of revenue:
Product	49.7	43.2	137.7	126.9
Subscription and support	74.0	51.7	200.4	141.4
Total cost of revenue	123.7	94.9	338.1	268.3
Total gross profit	308.1	250.9	914.4	709.4
Operating expenses:
Research and development	86.0	74.0	260.1	207.7
Sales and marketing	226.9	195.9	673.7	537.8
General and administrative	44.3	33.5	133.1	98.5
Total operating expenses	357.2	303.4	1,066.9	844.0
Operating loss	(49.1)	(52.5)	(152.5)	(134.6)
Interest expense	(6.2)	(5.8)	(18.3)	(17.4)
Other income, net	2.1	1.0	7.3	5.7
Loss before income taxes	(53.2)	(57.3)	(163.5)	(146.3)
Provision for income taxes	7.7	6.8	14.9	15.0
Net loss	$ (60.9)	$ (64.1)	$ (178.4)	$ (161.3)
Net loss per share, basic and diluted	$ (0.67)	$ (0.73)	$ (1.97)	$ (1.86)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0	87.8	90.5	86.5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Net loss	$ (60.9)	$ (64.1)	$ (178.4)	$ (161.3)
Other comprehensive income (loss), net of tax:
Change in unrealized gains (losses) on investments	0.0	1.3	(4.7)	0.7
Change in unrealized gains (losses) on cash flow hedges	0.9	0.0	(0.5)	0.0
Other comprehensive income (loss)	0.9	1.3	(5.2)	0.7
Comprehensive loss	$ (60.0)	$ (62.8)	$ (183.6)	$ (160.6)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash flows from operating activities
Net loss	$ (178.4)	$ (161.3)
Adjustments to reconcile net loss to net cash provided by operating activities:
Share-based compensation for equity based awards	356.8	283.2
Depreciation and amortization	43.1	30.7
Amortization of investment premiums, net of accretion of purchase discounts	2.1	2.4
Amortization of debt discount and debt issuance costs	18.3	17.4
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	(14.9)	(55.3)
Prepaid expenses and other assets	(49.6)	(17.8)
Accounts payable	2.8	11.7
Accrued compensation	1.7	(23.4)
Accrued and other liabilities	77.0	28.2
Deferred revenue	370.1	355.5
Net cash provided by operating activities	629.0	471.3
Cash flows from investing activities
Purchases of investments	(726.9)	(830.1)
Proceeds from sales of investments	0.0	137.4
Proceeds from maturities of investments	520.7	409.6
Business acquisitions, net of cash acquired	(90.7)	0.0
Purchases of property, equipment, and other assets	(114.2)	(56.2)
Net cash used in investing activities	(411.1)	(339.3)
Cash flows from financing activities
Repurchases of common stock	(295.1)	0.0
Proceeds from sales of shares through employee equity incentive plans	45.8	42.2
Payments for taxes related to net share settlement of equity awards	(11.0)	0.0
Net cash provided by (used in) financing activities	(260.3)	42.2
Net increase (decrease) in cash and cash equivalents	(42.4)	174.2
Cash and cash equivalents—beginning of period	734.4	375.8
Cash and cash equivalents—end of period	$ 692.0	$ 550.0

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

9 Months Ended

Apr. 30, 2017

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, our early adoption of new accounting guidance related to share-based payments, 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 nine months ended April 30, 2017, 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 and our early adoption of the new share-based payment accounting guidance 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 policy change for the periods presented in our condensed consolidated financial statements (in millions, except per share data):



	April 30, 2017								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	$	99.4		$	59.7	$	159.1		$	84.8		$	54.9	$	139.7
Other assets	91.7			56.5		148.2			64.6			50.1		114.7
Other long-term liabilities	136.7			0.4		137.1			79.4			—		79.4
Accumulated deficit	$	(914.3	)	$	115.8	$	(798.5	)	$	(726.6	)	$	105.0	$	(621.6	)



	Three Months Ended April 30, 2017									Three Months Ended April 30, 2016
	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	$	234.6		$	(7.7	)	$	226.9		$	202.0		$	(6.1	)	$	195.9
Operating loss	(56.8		)	7.7			(49.1		)	(58.6		)	6.1			(52.5		)
Provision for income taxes	7.3			0.4			7.7			6.8			—			6.8
Net loss	$	(68.2	)	$	7.3		$	(60.9	)	$	(70.2	)	$	6.1		$	(64.1	)
Net loss per share, basic and diluted	$	(0.75	)	$	0.08		$	(0.67	)	$	(0.80	)	$	0.07		$	(0.73	)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0			—			91.0			87.8			—			87.8

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(68.2	)	$	7.3		$	(60.9	)	$	(70.2	)	$	6.1		$	(64.1	)
Comprehensive loss	$	(67.3	)	$	7.3		$	(60.0	)	$	(68.9	)	$	6.1		$	(62.8	)



	Nine Months Ended April 30, 2017⁽¹⁾									Nine Months Ended April 30, 2016
	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	$	684.8		$	(11.1	)	$	673.7		$	547.9		$	(10.1	)	$	537.8
Operating loss	(163.6		)	11.1			(152.5		)	(144.7		)	10.1			(134.6		)
Provision for income taxes	14.6			0.3			14.9			15.0			—			15.0
Net loss	$	(189.2	)	$	10.8		$	(178.4	)	$	(171.4	)	$	10.1		$	(161.3	)
Net loss per share, basic and diluted	$	(2.09	)	$	0.12		$	(1.97	)	$	(1.98	)	$	0.12		$	(1.86	)
Weighted-average shares used to compute net loss per share, basic and diluted	90.5			—			90.5			86.5			—			86.5

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(189.2	)	$	10.8		$	(178.4	)	$	(171.4	)	$	10.1		$	(161.3	)
Comprehensive loss	$	(194.4	)	$	10.8		$	(183.6	)	$	(170.7	)	$	10.1		$	(160.6	)

______________


(1)	Amounts reflect an adjustment for the three months ended October 31, 2016, due to our early adoption of new share-based payment accounting guidance in our second quarter of fiscal 2017. Refer to “Recent Accounting Pronouncements” below for more information.

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 nine months ended April 30, 2016.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (“FASB”) issued authoritative guidance simplifying several aspects of the accounting for employee share-based payment transactions. The new standard requires us to recognize excess tax benefits or deficiencies as income tax expense or benefit in the period in which they occur, rather than additional paid-in capital, and also requires us to recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. In addition, excess tax benefits should be classified as an operating activity, along with other income tax cash flows, instead of a financing activity in our condensed consolidated statements of cash flows. The standard also allows us to make an accounting policy election to account for forfeitures of share-based payment awards when they occur, rather than estimate expected forfeitures.

We elected to early adopt the standard in our second quarter of fiscal 2017, which required us to reflect any adjustments related to the adoption as of the beginning of the fiscal year. The impact of the adoption on our condensed consolidated financial statements was as follows:

•

Income tax accounting - We adopted the guidance related to the timing of when excess tax benefits are recognized on a modified retrospective basis. As a result, we recorded the cumulative effect of the change as a $3.5 million reduction to accumulated deficit as of August 1, 2016, to reflect the recognition of excess tax benefits in prior years, with a corresponding adjustment to deferred tax assets and long-term tax liabilities. We adopted the guidance related to the recognition of excess tax benefits and deficiencies as income tax expense or benefit on a prospective basis.

•

Cash flow presentation of excess tax benefits - We elected to adopt the guidance related to the presentation of excess tax benefits in our condensed consolidated statements of cash flows on a retrospective basis, which increased net cash provided by operating activities by $0.7 million for the nine months ended April 30, 2016, with a corresponding decrease to net cash provided by financing activities.


•	Forfeitures - We elected to account for forfeitures when they occur and adopted this change on a modified retrospective basis. As a result, we recorded the cumulative effect of the change as a $2.0 million increase to accumulated deficit as of August 1, 2016.

The adoption of the standard also impacted our previously reported results for the three months ended October 31, 2016, as presented in the following tables (in millions, except per share data):



	October 31, 2016
	As Previously Reported			Impact of Adoption			As Adjusted
Condensed Consolidated Balance Sheets
Other assets	$	102.0		$	1.7		$	103.7
Other long-term liabilities	85.8			(5.6		)	80.2
Common stock and additional paid-in capital	1,542.2			0.9			1,543.1
Accumulated deficit	$	(683.4	)	$	6.4		$	(677.0	)



	Three Months Ended October 31, 2016
	As Previously Reported			Impact of Adoption			As Adjusted
Condensed Consolidated Statements of Operations
Total cost of revenue⁽¹⁾	$	101.3		$	(0.1	)	$	101.2
Total operating expenses⁽¹⁾	346.7			(0.8		)	345.9
Provision for income taxes	8.4			(4.0		)	4.4
Net loss	$	(61.8	)	$	4.9		$	(56.9	)
Net loss per share, basic and diluted	$	(0.69	)	$	0.06		$	(0.63	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			—			89.8

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(61.8	)	$	4.9		$	(56.9	)
Comprehensive loss	$	(64.7	)	$	4.9		$	(59.8	)

Condensed Consolidated Statements of Cash Flows
Net cash provided by operating activities	$	203.3		$	0.2		$	203.5
Net cash used in financing activities	$	(27.1	)	$	(0.2	)	$	(27.3	)

______________


(1)	Adjustments consist of share-based compensation, which was impacted by our policy election to account for forfeitures when they occur. The impact of adoption on each cost and expense line item within these subtotals was not significant.

In April 2015, the FASB issued new authoritative guidance on fees paid in a cloud computing arrangement. The standard requires customers in a cloud computing arrangement to evaluate whether the arrangement includes a software license. If the arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If the arrangement does not include a software license, the customer should account for the arrangement as a service contract. We adopted the standard in our first quarter of fiscal 2017 on a prospective basis. Our adoption of this standard 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 standard 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 January 2017, the FASB issued authoritative guidance simplifying the subsequent measurement of goodwill. The standard eliminates Step 2 of the current goodwill impairment test, which requires companies to determine the implied fair value of goodwill when measuring the amount of impairment loss. Under the new standard, goodwill impairment will be measured as the amount by which a reporting unit’s carrying value exceeds its fair value, with the loss limited to the total amount of goodwill allocated to that reporting unit. The standard is effective for us for our first quarter of fiscal 2021 and will be applied on a prospective basis. Early adoption is permitted. We do not expect the adoption of the standard will have a material impact on our condensed consolidated financial statements.

In January 2017, the FASB issued authoritative guidance clarifying the definition of a business to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The standard is effective for us for our first quarter of fiscal 2019 and will be applied on a prospective basis. Early adoption is permitted. We are currently evaluating whether this standard will have a material impact on our condensed consolidated financial statements.

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 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 do not plan to early adopt, and accordingly, we will adopt the new standard in our first quarter of fiscal 2019. We are continuing to evaluate the impact of the new standard on our accounting policies, processes, and system requirements, and have assigned cross-functional internal resources and engaged third-party service providers to assist in our evaluation and system implementation. Furthermore, we have made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. We are also continuing to evaluate adoption methods and the potential impact that the implementation of this standard will have on our condensed consolidated financial statements, but have not yet determined whether the effect will be material. However, we believe this new standard will impact our accounting for revenue arrangements in the following areas:


•	removal of the current limitation on contingent revenue may result in revenue being recognized earlier for certain contracts;


•	term license revenue associated with our virtual firewalls will be recognized upfront;


•	allocation of revenue related to software due to the removal of the residual method of revenue recognition; and


•	amortization period for deferred commissions.

We will continue to assess the new standard along with industry trends and additional interpretive guidance, and may adjust our implementation plan accordingly. We expect to finalize our adoption method and assessment of the impact that the implementation of this standard will have on our condensed consolidated financial statements by the end of fiscal 2017.

Fair Value Measurements (Notes)

9 Months Ended

Apr. 30, 2017

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 April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017								July 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents:
U.S. government and agency securities	$	—	$	19.0	$	—	$	19.0	$	—	$	—	$	—	$	—
Total cash equivalents	—		19.0		—		19.0		—		—		—		—
Short-term investments:
Commercial paper	—		15.0		—		15.0		—		3.0		—		3.0
Corporate debt securities	—		160.1		—		160.1		—		121.4		—		121.4
U.S. government and agency securities	—		504.9		—		504.9		—		426.8		—		426.8
Total short-term investments	—		680.0		—		680.0		—		551.2		—		551.2
Long-term investments:
Certificates of deposit	—		5.4		—		5.4		—		5.4		—		5.4
Corporate debt securities	—		176.1		—		176.1		—		166.1		—		166.1
U.S. government and agency securities	—		537.6		—		537.6		—		481.3		—		481.3
Total long-term investments	—		719.1		—		719.1		—		652.8		—		652.8
Total assets measured at fair value	$	—	$	1,418.1	$	—	$	1,418.1	$	—	$	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 7. Convertible Senior Notes for the carrying amount and estimated fair value of our convertible senior notes as of April 30, 2017 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 (Notes)

9 Months Ended

Apr. 30, 2017

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 April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	5.4	$	—	$	—		$	5.4
Commercial paper	15.0		—		—			15.0
Corporate debt securities	336.6		0.2		(0.6		)	336.2
U.S. government and agency securities	1,064.2		0.1		(2.8		)	1,061.5
Total	$	1,421.2	$	0.3	$	(3.4	)	$	1,418.1



	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 April 30, 2017 and July 31, 2016.

The following table summarizes the amortized cost and fair value of our available-for-sale investments as of April 30, 2017, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	699.7	$	699.0
Due between one and three years	721.5		719.1
Total	$	1,421.2	$	1,418.1

- Definition

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

+ References + Details

Derivative Instruments (Notes)	9 Months Ended
Derivative Instruments (Notes)	Apr. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	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. Beginning 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. As of April 30, 2017, the total notional amount of our outstanding foreign currency forward contracts was $37.5 million. Refer to Note 2. Fair Value Measurements for the fair value of our derivative instruments as reported in our condensed consolidated balance sheets as of April 30, 2017. During the three and nine months ended April 30, 2017, both unrealized losses recognized in AOCI related to the effective portion of our cash flow hedges and amounts reclassified into earnings were not material. Total unrealized losses in AOCI related to the effective portion of our cash flow hedges as of April 30, 2017 were also not material.

- 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

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+ Details

Acquisitions (Notes)

9 Months Ended

Apr. 30, 2017

Business Combinations [Abstract]

Acquisitions

LightCyber Ltd.

On February 27, 2017, we completed our acquisition of all outstanding shares of LightCyber Ltd. (“LightCyber”), a privately-held cybersecurity company, for total consideration of $103.1 million in cash. The acquisition expands the functionality of our next-generation security platform with the addition of LightCyber’s behavioral analytics technology.

We have accounted for this transaction as a business combination and allocated the purchase consideration to assets acquired and liabilities assumed based on their preliminary estimated fair values, as presented in the following table (in millions):



	Amount
Cash	$	12.4
Goodwill	75.3
Identified intangible assets	19.5
Net liabilities assumed	(4.1		)
Total	$	103.1

Additional information, such as that related to income tax and other contingencies, existing as of the acquisition date but unknown to us may become known during the remainder of the measurement period, not to exceed 12 months from the acquisition date, which may result in changes to the amounts and allocations recorded.

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



	Fair Value		Estimated Useful Life
Developed technology	$	16.6	8 years
Customer relationships	2.9		8 years
Total	$	19.5

Goodwill generated from this business combination is primarily attributable to the assembled workforce and expected synergies from integrating the LightCyber technology into our platform. The goodwill is not deductible for income tax purposes.

LightCyber’s operating results are included in our condensed consolidated statements of operations from the date of acquisition. Pro forma results of operations have not been presented as the impact to our condensed consolidated statements of operations is not material

- Definition

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

+ References

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+ Details

Goodwill and Intangible Assets (Notes)

9 Months Ended

Apr. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill

The following table presents details of our goodwill during the nine months ended April 30, 2017 (in millions):



	Amount
Balance as of July 31, 2016	$	163.5
Goodwill acquired	75.3
Balance as of April 30, 2017	$	238.8

Purchased Intangible Assets

The following table presents details of our purchased intangible assets as of April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017							July 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	69.7	$	(21.3	)	$	48.4	$	53.1	$	(15.4	)	$	37.7
Acquired intellectual property	8.9		(3.6		)	5.3		8.9		(2.9		)	6.0
Customer relationships	2.9		(0.1		)	2.8		—		—			—
In-process research and development held for defensive purposes	1.9		(1.9		)	—		1.9		(1.6		)	0.3
Other	0.5		(0.5		)	—		0.5		(0.5		)	—
Total purchased intangible assets	$	83.9	$	(27.4	)	$	56.5	$	64.4	$	(20.4	)	$	44.0

We recognized amortization expense of $2.5 million and $7.1 million for the three and nine months ended April 30, 2017, respectively, and $2.3 million and $7.1 million for the three and nine months ended April 30, 2016, respectively.

The following table summarizes our estimated future amortization expense of intangible assets as of April 30, 2017 (in millions):



	Amount
Fiscal years ending July 31:
Remaining 2017	$	2.7
2018	10.7
2019	10.6
2020	10.6
2021	8.9
2022 and thereafter	13.0
Total future amortization expense	$	56.5

- Definition

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

+ References + Details

Convertible Senior Notes (Notes)

9 Months Ended

Apr. 30, 2017

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 April 30, 2017. Since the Notes were not convertible, the net carrying amount of the Notes was classified as a long-term liability and the equity component was included in additional paid-in capital in our condensed consolidated balance sheets as of April 30, 2017.

The following table sets forth the components of the Notes as of April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017		July 31, 2016
Liability:
Principal	$	575.0	$	575.0
Less: debt discount and debt issuance costs, net of amortization	56.6		74.8
Net carrying amount	$	518.4	$	500.2

Equity	$	109.8	$	109.8

The total estimated fair value of the Notes was $671.3 million and $761.9 million at April 30, 2017 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 April 30, 2017 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 April 30, 2017, the if-converted value of the Notes exceeded its principal amount by $7.7 million.

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



	Three Months Ended						Nine Months Ended
	April 30,						April 30,
	2017			2016			2017			2016
Amortization of debt discount	$	5.5		$	5.3		$	16.4		$	15.7
Amortization of debt issuance costs	0.7			0.6			1.9			1.7
Total interest expense recognized	$	6.2		$	5.9		$	18.3		$	17.4

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

Note Hedges

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

9 Months Ended

Apr. 30, 2017

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 April 30, 2017 (in millions):



	Amount
Fiscal years ending July 31:
Remaining 2017	$	7.2
2018	29.7
2019	48.8
2020	52.2
2021	56.5
2022 and thereafter	318.5
Committed gross lease payments	512.9
Less: proceeds from sublease rental	2.9
Net operating lease obligation	$	510.0

Manufacturing Purchase 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 non-cancelable orders for components and products to our independent contract manufacturer, original design manufacturers, or component suppliers. As of April 30, 2017, our purchase commitments under such orders were $104.3 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 April 30, 2017, 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 (Notes)	9 Months Ended
Stockholders' Equity (Notes)	Apr. 30, 2017
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity Share Repurchase On August 26, 2016, our board of directors authorized a $500.0 million share repurchase which is funded from available working capital. On February 24, 2017, our board of directors authorized a $500.0 million increase to our repurchase program, bringing the total authorization to $1.0 billion. 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 December 31, 2018, and may be suspended or discontinued at any time. During the three and nine months ended April 30, 2017, we repurchased and retired 1.1 million and 2.4 million shares, respectively, of our common stock under the authorization for an aggregate purchase price of $125.0 million and $295.1 million, respectively. 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 April 30, 2017, $704.9 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
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-Name Accounting Standards Codification
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+ Details

Equity Award Plans (Notes)

9 Months Ended

Apr. 30, 2017

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	(0.5	)	14.23
Balance—April 30, 2017	1.6		$	13.20	4.5	$	156.7
Options exercisable—April 30, 2017	1.6		$	13.20	4.5	$	156.7

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

In October 2016, we granted PSAs to certain 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 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.

In February 2017, we began to net-share settle equity awards held by certain employees by withholding shares upon vesting to satisfy tax withholding obligations. The shares withheld to satisfy employee tax withholding obligations are returned to our 2012 Equity Incentive Plan (our “2012 Plan”) and will be available for future issuance under our 2012 Plan. Payments for employees’ tax obligations to the tax authorities are reflected as financing activities in our condensed consolidated statements of cash flows.

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		2.8		143.28
Vested	(0.3	)	170.97		(2.6	)	118.53
Forfeited	—		—		(0.4	)	137.88
Balance—April 30, 2017	1.1		$	164.24	6.3		$	140.29	1.3	$	687.1

______________


(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				Nine Months Ended
	April 30,				April 30,
	2017		2016		2017⁽¹⁾		2016
Cost of product revenue	$	1.8	$	1.6	$	5.5	$	4.5
Cost of subscription and support revenue	14.0		11.5		41.3		29.0
Research and development	37.1		36.0		116.4		95.9
Sales and marketing	46.2		43.8		139.7		110.4
General and administrative	18.3		15.6		55.1		43.5
Total share-based compensation	$	117.4	$	108.5	$	358.0	$	283.3

______________


(1)	Amounts reflect an adjustment for the three months ended October 31, 2016, due to our early adoption of new share-based payment accounting guidance. Refer to Note 1. Description of Business and Summary of Significant Accounting Policies for more information.

As of April 30, 2017, total compensation cost related to unvested share-based awards not yet recognized was $913.0 million. This cost is expected to be amortized on a straight-line basis over a weighted-average period of approximately 2.5 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 (Notes)	9 Months Ended
Income Taxes (Notes)	Apr. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our provision for income taxes for the three and nine months ended April 30, 2017 reflects an effective tax rate of (14.5)% and (9.1)%, respectively. Our effective tax rates for these periods were 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, and amortization of our deferred tax charges. Our effective tax rate differs from the U.S. statutory tax rate primarily due to changes in non-deductible share-based compensation, foreign income at other than U.S. tax rates, and changes in our valuation allowance. As compared to the same periods last year, our effective tax rate changed primarily due to changes in our foreign income taxed at other than U.S. rates and our valuation allowance. Our provision for income taxes for the three and nine months ended April 30, 2016 reflects an effective tax rate of (11.9)% and (10.3)%, respectively. Our effective tax rates for these periods were 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. As of April 30, 2017, we had $289.1 million of unrecognized tax benefits, $29.2 million of which would affect income tax expense if recognized, after consideration of our valuation allowance in the United States and other assets. As of July 31, 2016, we had $127.7 million of unrecognized tax benefits, $21.9 million of which would affect income tax expense if recognized, after consideration of our valuation allowance in the United States and other assets. The increase in unrecognized tax benefits since July 31, 2016 relates to positions taken relating to transfer pricing in the current year. As of April 30, 2017, our federal, state, and foreign returns for the tax years 2008 through the current period remain open to examination. Fiscal years outside the normal statute of limitation remain open to audit by tax authorities due to tax attributes generated in earlier years, which have been carried forward and may be audited in subsequent years when utilized. We do not expect our unrecognized tax benefits to change significantly over the next 12 months. We recognize both interest and penalties associated with uncertain tax positions as a component of income tax expense. The ultimate amount and timing of any future cash settlements cannot be predicted with reasonable certainty.

Net Income (Loss) Per Share (Notes)

9 Months Ended

Apr. 30, 2017

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						Nine Months Ended
	April 30,						April 30,
	2017			2016			2017			2016
Net loss	$	(60.9	)	$	(64.1	)	$	(178.4	)	$	(161.3	)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0			87.8			90.5			86.5
Net loss per share, basic and diluted	$	(0.67	)	$	(0.73	)	$	(1.97	)	$	(1.86	)

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 and Nine Months Ended
	April 30,
	2017	2016
RSUs	6.3	7.0
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	1.6	2.3
RSAs and PSAs	1.1	1.1
Total	19.4	20.8

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

9 Months Ended

Apr. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Principles of Consolidation

Change in Accounting Policy for Sales Commissions



	April 30, 2017								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	$	99.4		$	59.7	$	159.1		$	84.8		$	54.9	$	139.7
Other assets	91.7			56.5		148.2			64.6			50.1		114.7
Other long-term liabilities	136.7			0.4		137.1			79.4			—		79.4
Accumulated deficit	$	(914.3	)	$	115.8	$	(798.5	)	$	(726.6	)	$	105.0	$	(621.6	)



	Three Months Ended April 30, 2017									Three Months Ended April 30, 2016
	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	$	234.6		$	(7.7	)	$	226.9		$	202.0		$	(6.1	)	$	195.9
Operating loss	(56.8		)	7.7			(49.1		)	(58.6		)	6.1			(52.5		)
Provision for income taxes	7.3			0.4			7.7			6.8			—			6.8
Net loss	$	(68.2	)	$	7.3		$	(60.9	)	$	(70.2	)	$	6.1		$	(64.1	)
Net loss per share, basic and diluted	$	(0.75	)	$	0.08		$	(0.67	)	$	(0.80	)	$	0.07		$	(0.73	)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0			—			91.0			87.8			—			87.8

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(68.2	)	$	7.3		$	(60.9	)	$	(70.2	)	$	6.1		$	(64.1	)
Comprehensive loss	$	(67.3	)	$	7.3		$	(60.0	)	$	(68.9	)	$	6.1		$	(62.8	)



	Nine Months Ended April 30, 2017⁽¹⁾									Nine Months Ended April 30, 2016
	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	$	684.8		$	(11.1	)	$	673.7		$	547.9		$	(10.1	)	$	537.8
Operating loss	(163.6		)	11.1			(152.5		)	(144.7		)	10.1			(134.6		)
Provision for income taxes	14.6			0.3			14.9			15.0			—			15.0
Net loss	$	(189.2	)	$	10.8		$	(178.4	)	$	(171.4	)	$	10.1		$	(161.3	)
Net loss per share, basic and diluted	$	(2.09	)	$	0.12		$	(1.97	)	$	(1.98	)	$	0.12		$	(1.86	)
Weighted-average shares used to compute net loss per share, basic and diluted	90.5			—			90.5			86.5			—			86.5

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(189.2	)	$	10.8		$	(178.4	)	$	(171.4	)	$	10.1		$	(161.3	)
Comprehensive loss	$	(194.4	)	$	10.8		$	(183.6	)	$	(170.7	)	$	10.1		$	(160.6	)

______________


(1)	Amounts reflect an adjustment for the three months ended October 31, 2016, due to our early adoption of new share-based payment accounting guidance in our second quarter of fiscal 2017. Refer to “Recent Accounting Pronouncements” below for more information.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

•


•	Forfeitures - We elected to account for forfeitures when they occur and adopted this change on a modified retrospective basis. As a result, we recorded the cumulative effect of the change as a $2.0 million increase to accumulated deficit as of August 1, 2016.

The adoption of the standard also impacted our previously reported results for the three months ended October 31, 2016, as presented in the following tables (in millions, except per share data):



	October 31, 2016
	As Previously Reported			Impact of Adoption			As Adjusted
Condensed Consolidated Balance Sheets
Other assets	$	102.0		$	1.7		$	103.7
Other long-term liabilities	85.8			(5.6		)	80.2
Common stock and additional paid-in capital	1,542.2			0.9			1,543.1
Accumulated deficit	$	(683.4	)	$	6.4		$	(677.0	)



	Three Months Ended October 31, 2016
	As Previously Reported			Impact of Adoption			As Adjusted
Condensed Consolidated Statements of Operations
Total cost of revenue⁽¹⁾	$	101.3		$	(0.1	)	$	101.2
Total operating expenses⁽¹⁾	346.7			(0.8		)	345.9
Provision for income taxes	8.4			(4.0		)	4.4
Net loss	$	(61.8	)	$	4.9		$	(56.9	)
Net loss per share, basic and diluted	$	(0.69	)	$	0.06		$	(0.63	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			—			89.8

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(61.8	)	$	4.9		$	(56.9	)
Comprehensive loss	$	(64.7	)	$	4.9		$	(59.8	)

Condensed Consolidated Statements of Cash Flows
Net cash provided by operating activities	$	203.3		$	0.2		$	203.5
Net cash used in financing activities	$	(27.1	)	$	(0.2	)	$	(27.3	)

______________


(1)	Adjustments consist of share-based compensation, which was impacted by our policy election to account for forfeitures when they occur. The impact of adoption on each cost and expense line item within these subtotals was not significant.

Recently Issued Accounting Pronouncements


•	removal of the current limitation on contingent revenue may result in revenue being recognized earlier for certain contracts;


•	term license revenue associated with our virtual firewalls will be recognized upfront;


•	allocation of revenue related to software due to the removal of the residual method of revenue recognition; and


•	amortization period for deferred commissions.

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)

9 Months Ended

Apr. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of change in accounting policy for sales commissions



	April 30, 2017								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	$	99.4		$	59.7	$	159.1		$	84.8		$	54.9	$	139.7
Other assets	91.7			56.5		148.2			64.6			50.1		114.7
Other long-term liabilities	136.7			0.4		137.1			79.4			—		79.4
Accumulated deficit	$	(914.3	)	$	115.8	$	(798.5	)	$	(726.6	)	$	105.0	$	(621.6	)



	Three Months Ended April 30, 2017									Three Months Ended April 30, 2016
	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	$	234.6		$	(7.7	)	$	226.9		$	202.0		$	(6.1	)	$	195.9
Operating loss	(56.8		)	7.7			(49.1		)	(58.6		)	6.1			(52.5		)
Provision for income taxes	7.3			0.4			7.7			6.8			—			6.8
Net loss	$	(68.2	)	$	7.3		$	(60.9	)	$	(70.2	)	$	6.1		$	(64.1	)
Net loss per share, basic and diluted	$	(0.75	)	$	0.08		$	(0.67	)	$	(0.80	)	$	0.07		$	(0.73	)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0			—			91.0			87.8			—			87.8

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(68.2	)	$	7.3		$	(60.9	)	$	(70.2	)	$	6.1		$	(64.1	)
Comprehensive loss	$	(67.3	)	$	7.3		$	(60.0	)	$	(68.9	)	$	6.1		$	(62.8	)



	Nine Months Ended April 30, 2017⁽¹⁾									Nine Months Ended April 30, 2016
	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	$	684.8		$	(11.1	)	$	673.7		$	547.9		$	(10.1	)	$	537.8
Operating loss	(163.6		)	11.1			(152.5		)	(144.7		)	10.1			(134.6		)
Provision for income taxes	14.6			0.3			14.9			15.0			—			15.0
Net loss	$	(189.2	)	$	10.8		$	(178.4	)	$	(171.4	)	$	10.1		$	(161.3	)
Net loss per share, basic and diluted	$	(2.09	)	$	0.12		$	(1.97	)	$	(1.98	)	$	0.12		$	(1.86	)
Weighted-average shares used to compute net loss per share, basic and diluted	90.5			—			90.5			86.5			—			86.5

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(189.2	)	$	10.8		$	(178.4	)	$	(171.4	)	$	10.1		$	(161.3	)
Comprehensive loss	$	(194.4	)	$	10.8		$	(183.6	)	$	(170.7	)	$	10.1		$	(160.6	)

______________


(1)	Amounts reflect an adjustment for the three months ended October 31, 2016, due to our early adoption of new share-based payment accounting guidance in our second quarter of fiscal 2017. Refer to “Recent Accounting Pronouncements” below for more information.

New share-based payment accounting guidance, early adoption

The adoption of the standard also impacted our previously reported results for the three months ended October 31, 2016, as presented in the following tables (in millions, except per share data):



	October 31, 2016
	As Previously Reported			Impact of Adoption			As Adjusted
Condensed Consolidated Balance Sheets
Other assets	$	102.0		$	1.7		$	103.7
Other long-term liabilities	85.8			(5.6		)	80.2
Common stock and additional paid-in capital	1,542.2			0.9			1,543.1
Accumulated deficit	$	(683.4	)	$	6.4		$	(677.0	)



	Three Months Ended October 31, 2016
	As Previously Reported			Impact of Adoption			As Adjusted
Condensed Consolidated Statements of Operations
Total cost of revenue⁽¹⁾	$	101.3		$	(0.1	)	$	101.2
Total operating expenses⁽¹⁾	346.7			(0.8		)	345.9
Provision for income taxes	8.4			(4.0		)	4.4
Net loss	$	(61.8	)	$	4.9		$	(56.9	)
Net loss per share, basic and diluted	$	(0.69	)	$	0.06		$	(0.63	)
Weighted-average shares used to compute net loss per share, basic and diluted	89.8			—			89.8

Condensed Consolidated Statements of Comprehensive Loss
Net loss	$	(61.8	)	$	4.9		$	(56.9	)
Comprehensive loss	$	(64.7	)	$	4.9		$	(59.8	)

Condensed Consolidated Statements of Cash Flows
Net cash provided by operating activities	$	203.3		$	0.2		$	203.5
Net cash used in financing activities	$	(27.1	)	$	(0.2	)	$	(27.3	)

______________


(1)	Adjustments consist of share-based compensation, which was impacted by our policy election to account for forfeitures when they occur. The impact of adoption on each cost and expense line item within these subtotals was not significant.

- 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)

9 Months Ended

Apr. 30, 2017

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 April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017								July 31, 2016
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents:
U.S. government and agency securities	$	—	$	19.0	$	—	$	19.0	$	—	$	—	$	—	$	—
Total cash equivalents	—		19.0		—		19.0		—		—		—		—
Short-term investments:
Commercial paper	—		15.0		—		15.0		—		3.0		—		3.0
Corporate debt securities	—		160.1		—		160.1		—		121.4		—		121.4
U.S. government and agency securities	—		504.9		—		504.9		—		426.8		—		426.8
Total short-term investments	—		680.0		—		680.0		—		551.2		—		551.2
Long-term investments:
Certificates of deposit	—		5.4		—		5.4		—		5.4		—		5.4
Corporate debt securities	—		176.1		—		176.1		—		166.1		—		166.1
U.S. government and agency securities	—		537.6		—		537.6		—		481.3		—		481.3
Total long-term investments	—		719.1		—		719.1		—		652.8		—		652.8
Total assets measured at fair value	$	—	$	1,418.1	$	—	$	1,418.1	$	—	$	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)

9 Months Ended

Apr. 30, 2017

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 April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Certificates of deposit	$	5.4	$	—	$	—		$	5.4
Commercial paper	15.0		—		—			15.0
Corporate debt securities	336.6		0.2		(0.6		)	336.2
U.S. government and agency securities	1,064.2		0.1		(2.8		)	1,061.5
Total	$	1,421.2	$	0.3	$	(3.4	)	$	1,418.1



	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 April 30, 2017, by contractual years-to-maturity (in millions):



	Amortized Cost		Fair Value
Due within one year	$	699.7	$	699.0
Due between one and three years	721.5		719.1
Total	$	1,421.2	$	1,418.1

- Definition

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

+ References + Details

Acquisitions (Tables)

9 Months Ended

Apr. 30, 2017

Business Combinations [Abstract]

Schedule of recognized identified assets acquired and liabilities assumed



	Amount
Cash	$	12.4
Goodwill	75.3
Identified intangible assets	19.5
Net liabilities assumed	(4.1		)
Total	$	103.1

Finite-lived intangible assets acquired as part of business combination

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



	Fair Value		Estimated Useful Life
Developed technology	$	16.6	8 years
Customer relationships	2.9		8 years
Total	$	19.5

Goodwill and Intangible Assets (Tables)

9 Months Ended

Apr. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

The following table presents details of our goodwill during the nine months ended April 30, 2017 (in millions):



	Amount
Balance as of July 31, 2016	$	163.5
Goodwill acquired	75.3
Balance as of April 30, 2017	$	238.8

Schedule of intangible assets by major class

The following table presents details of our purchased intangible assets as of April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017							July 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	69.7	$	(21.3	)	$	48.4	$	53.1	$	(15.4	)	$	37.7
Acquired intellectual property	8.9		(3.6		)	5.3		8.9		(2.9		)	6.0
Customer relationships	2.9		(0.1		)	2.8		—		—			—
In-process research and development held for defensive purposes	1.9		(1.9		)	—		1.9		(1.6		)	0.3
Other	0.5		(0.5		)	—		0.5		(0.5		)	—
Total purchased intangible assets	$	83.9	$	(27.4	)	$	56.5	$	64.4	$	(20.4	)	$	44.0

Future amortization expense of intangible assets

The following table summarizes our estimated future amortization expense of intangible assets as of April 30, 2017 (in millions):



	Amount
Fiscal years ending July 31:
Remaining 2017	$	2.7
2018	10.7
2019	10.6
2020	10.6
2021	8.9
2022 and thereafter	13.0
Total future amortization expense	$	56.5

Convertible Senior Notes (Tables)

9 Months Ended

Apr. 30, 2017

Debt Disclosure [Abstract]

Components of Convertible Senior Notes

The following table sets forth the components of the Notes as of April 30, 2017 and July 31, 2016 (in millions):



	April 30, 2017		July 31, 2016
Liability:
Principal	$	575.0	$	575.0
Less: debt discount and debt issuance costs, net of amortization	56.6		74.8
Net carrying amount	$	518.4	$	500.2

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						Nine Months Ended
	April 30,						April 30,
	2017			2016			2017			2016
Amortization of debt discount	$	5.5		$	5.3		$	16.4		$	15.7
Amortization of debt issuance costs	0.7			0.6			1.9			1.7
Total interest expense recognized	$	6.2		$	5.9		$	18.3		$	17.4

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

Commitments and Contingencies (Tables)

9 Months Ended

Apr. 30, 2017

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 April 30, 2017 (in millions):



	Amount
Fiscal years ending July 31:
Remaining 2017	$	7.2
2018	29.7
2019	48.8
2020	52.2
2021	56.5
2022 and thereafter	318.5
Committed gross lease payments	512.9
Less: proceeds from sublease rental	2.9
Net operating lease obligation	$	510.0

Equity Award Plans (Tables)

9 Months Ended

Apr. 30, 2017

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	(0.5	)	14.23
Balance—April 30, 2017	1.6		$	13.20	4.5	$	156.7
Options exercisable—April 30, 2017	1.6		$	13.20	4.5	$	156.7

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		2.8		143.28
Vested	(0.3	)	170.97		(2.6	)	118.53
Forfeited	—		—		(0.4	)	137.88
Balance—April 30, 2017	1.1		$	164.24	6.3		$	140.29	1.3	$	687.1

______________


(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				Nine Months Ended
	April 30,				April 30,
	2017		2016		2017⁽¹⁾		2016
Cost of product revenue	$	1.8	$	1.6	$	5.5	$	4.5
Cost of subscription and support revenue	14.0		11.5		41.3		29.0
Research and development	37.1		36.0		116.4		95.9
Sales and marketing	46.2		43.8		139.7		110.4
General and administrative	18.3		15.6		55.1		43.5
Total share-based compensation	$	117.4	$	108.5	$	358.0	$	283.3

______________


(1)	Amounts reflect an adjustment for the three months ended October 31, 2016, due to our early adoption of new share-based payment accounting guidance. Refer to Note 1. Description of Business and Summary of Significant Accounting Policies for more information.

Net Income (Loss) Per Share (Tables)

9 Months Ended

Apr. 30, 2017

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						Nine Months Ended
	April 30,						April 30,
	2017			2016			2017			2016
Net loss	$	(60.9	)	$	(64.1	)	$	(178.4	)	$	(161.3	)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0			87.8			90.5			86.5
Net loss per share, basic and diluted	$	(0.67	)	$	(0.73	)	$	(1.97	)	$	(1.86	)

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 and Nine Months Ended
	April 30,
	2017	2016
RSUs	6.3	7.0
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	1.6	2.3
RSAs and PSAs	1.1	1.1
Total	19.4	20.8

Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Apr. 30, 2017	Oct. 31, 2016	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Aug. 01, 2016	Jul. 31, 2016	Aug. 01, 2015
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	$ 159.1			$ 159.1			$ 139.7
Other assets	148.2			148.2			106.7
Other long-term liabilities	137.1			137.1			79.4
Common stock and additional paid-in capital	1,615.8			1,615.8			1,515.5
Accumulated deficit	(798.5)			(798.5)			(621.6)
Total cost of revenue	123.7		$ 94.9	338.1	$ 268.3
Sales and marketing	226.9		195.9	673.7	537.8
Total operating expenses	357.2		303.4	1,066.9	844.0
Operating loss	(49.1)		(52.5)	(152.5)	(134.6)
Provision for income taxes	7.7		6.8	14.9	15.0
Net loss	$ (60.9)		$ (64.1)	$ (178.4)	$ (161.3)
Net loss per share, basic and diluted	$ (0.67)		$ (0.73)	$ (1.97)	$ (1.86)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0		87.8	90.5	86.5
Comprehensive loss	$ (60.0)		$ (62.8)	$ (183.6)	$ (160.6)
Convertible senior notes, net	518.4			518.4			500.2
Net cash provided by operating activities				629.0	471.3
Net cash provided by (used in) financing activities				(260.3)	42.2
New accounting pronouncement - accounting for employee share-based payment transaction
New Accounting Pronouncements or Change in Accounting Principle
Other assets		$ 103.7
Other long-term liabilities		80.2
Common stock and additional paid-in capital		1,543.1
Accumulated deficit		(677.0)
Total cost of revenue		101.2
Total operating expenses		345.9
Provision for income taxes		4.4
Net loss		$ (56.9)
Net loss per share, basic and diluted		$ (0.63)
Weighted-average shares used to compute net loss per share, basic and diluted		89.8
Comprehensive loss		$ (59.8)
Net cash provided by operating activities		203.5
Net cash provided by (used in) financing activities		(27.3)
New accounting pronouncement - accounting for employee share-based payment transaction \| As previously reported
New Accounting Pronouncements or Change in Accounting Principle
Other assets		102.0
Other long-term liabilities		85.8
Common stock and additional paid-in capital		1,542.2
Accumulated deficit		(683.4)
Total cost of revenue		101.3
Total operating expenses		346.7
Provision for income taxes		8.4
Net loss		$ (61.8)
Net loss per share, basic and diluted		$ (0.69)
Weighted-average shares used to compute net loss per share, basic and diluted		89.8
Comprehensive loss		$ (64.7)
Net cash provided by operating activities		203.3
Net cash provided by (used in) financing activities		(27.1)
New accounting pronouncement - accounting for employee share-based payment transaction \| Impact of change in accounting principle
New Accounting Pronouncements or Change in Accounting Principle
Other assets		1.7
Other long-term liabilities		(5.6)
Common stock and additional paid-in capital		0.9
Accumulated deficit		6.4
Total cost of revenue		(0.1)
Total operating expenses		(0.8)
Provision for income taxes		(4.0)
Net loss		$ 4.9
Net loss per share, basic and diluted		$ 0.06
Weighted-average shares used to compute net loss per share, basic and diluted		0.0
Comprehensive loss		$ 4.9
Net cash provided by operating activities		0.2			0.7
Net cash provided by (used in) financing activities		$ (0.2)			(0.7)
New accounting pronouncement - accounting for employee share-based payment transaction_income tax accounting
New Accounting Pronouncements or Change in Accounting Principle
Cumulative effect of new accounting principle in period of adoption						$ (3.5)
New accounting pronouncement - accounting for employee share-based payment transaction_forfeitures
New Accounting Pronouncements or Change in Accounting Principle
Cumulative effect of new accounting principle in period of adoption						$ 2.0
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)
Accounting policy for sales commission
New Accounting Pronouncements or Change in Accounting Principle
Change in accounting principle, cumulative effect of change on accumulated deficit as of the beginning of the earliest period presented								$ 71.8
Prepaid expenses and other current assets	159.1			159.1			139.7
Other assets	148.2			148.2			114.7
Other long-term liabilities	137.1			137.1			79.4
Accumulated deficit	(798.5)			(798.5)			(621.6)
Sales and marketing	226.9		195.9	673.7	537.8
Operating loss	(49.1)		(52.5)	(152.5)	(134.6)
Provision for income taxes	7.7		6.8	14.9	15.0
Net loss	$ (60.9)		$ (64.1)	$ (178.4)	$ (161.3)
Net loss per share, basic and diluted	$ (0.67)		$ (0.73)	$ (1.97)	$ (1.86)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0		87.8	90.5	86.5
Comprehensive loss	$ (60.0)		$ (62.8)	$ (183.6)	$ (160.6)
Accounting policy for sales commission \| As previously reported
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	99.4			99.4			84.8
Other assets	91.7			91.7			64.6
Other long-term liabilities	136.7			136.7			79.4
Accumulated deficit	(914.3)			(914.3)			(726.6)
Sales and marketing	234.6		202.0	684.8	547.9
Operating loss	(56.8)		(58.6)	(163.6)	(144.7)
Provision for income taxes	7.3		6.8	14.6	15.0
Net loss	$ (68.2)		$ (70.2)	$ (189.2)	$ (171.4)
Net loss per share, basic and diluted	$ (0.75)		$ (0.80)	$ (2.09)	$ (1.98)
Weighted-average shares used to compute net loss per share, basic and diluted	91.0		87.8	90.5	86.5
Comprehensive loss	$ (67.3)		$ (68.9)	$ (194.4)	$ (170.7)
Accounting policy for sales commission \| Impact of change in accounting principle
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	59.7			59.7			54.9
Other assets	56.5			56.5			50.1
Other long-term liabilities	0.4			0.4			0.0
Accumulated deficit	115.8			115.8			$ 105.0
Sales and marketing	(7.7)		(6.1)	(11.1)	(10.1)
Operating loss	7.7		6.1	11.1	10.1
Provision for income taxes	0.4		0.0	0.3	0.0
Net loss	$ 7.3		$ 6.1	$ 10.8	$ 10.1
Net loss per share, basic and diluted	$ 0.08		$ 0.07	$ 0.12	$ 0.12
Weighted-average shares used to compute net loss per share, basic and diluted	0.0		0.0	0.0	0.0
Comprehensive loss	$ 7.3		$ 6.1	$ 10.8	$ 10.1

Fair Value Measurements (Details) - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 19.0	$ 0.0
Short-term investments	680.0	551.2
Long-term investments	719.1	652.8
Total assets measured at fair value	1,418.1	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
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
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
Cash equivalents	19.0	0.0
Short-term investments	680.0	551.2
Long-term investments	719.1	652.8
Total assets measured at fair value	1,418.1	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
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
Accrued and other liabilities	0.0	0.0
Total liabilities 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	19.0	0.0
Short-term investments	504.9	426.8
Long-term investments	537.6	481.3
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	19.0	0.0
Short-term investments	504.9	426.8
Long-term investments	537.6	481.3
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
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Short-term investments	15.0	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	15.0	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	160.1	121.4
Long-term investments	176.1	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	160.1	121.4
Long-term investments	176.1	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
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	Apr. 30, 2017	Jul. 31, 2016
Schedule of Available-for-sale Securities
Amortized cost	$ 1,421.2	$ 1,202.4
Unrealized gains	0.3	1.7
Unrealized losses	(3.4)	(0.1)
Estimated fair value	1,418.1	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	15.0	3.0
Unrealized gains	0.0	0.0
Unrealized losses	0.0	0.0
Estimated fair value	15.0	3.0
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized cost	336.6	286.7
Unrealized gains	0.2	0.8
Unrealized losses	(0.6)	0.0
Estimated fair value	336.2	287.5
U.S. government and agency securities
Schedule of Available-for-sale Securities
Amortized cost	1,064.2	907.3
Unrealized gains	0.1	0.9
Unrealized losses	(2.8)	(0.1)
Estimated fair value	$ 1,061.5	$ 908.1

Investments (Available-for-Sale Investments, Contractual Maturities) (Details) - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Amortized Cost
Due within one year	$ 699.7
Due between one and three years	721.5
Total	1,421.2
Fair Value
Due within one year	699.0
Due between one and three years	719.1
Total	$ 1,418.1	$ 1,204.0

Derivative Instruments (Details) $ in Millions	9 Months Ended
Derivative Instruments (Details) $ in Millions	Apr. 30, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maximum contract term of cash flow hedge (in months)	12 months
Notional amount of derivatives	$ 37.5

Acquisitions (Consideration Transferred) (Details) $ in Millions	Feb. 27, 2017 USD ($)
LightCyber Ltd.
Business Acquisition
Cash consideration transferred	$ 103.1

Acquisitions (Purchase Price Allocation) (Details) - USD ($) $ in Millions	Apr. 30, 2017	Feb. 27, 2017	Jul. 31, 2016
Business Acquisition
Goodwill	$ 238.8		$ 163.5
LightCyber Ltd.
Business Acquisition
Cash		$ 12.4
Goodwill		75.3
Identified intangible assets		19.5
Net liabilities assumed		(4.1)
Total		$ 103.1

Acquisitions (Intangible assets acquired as part of business combination) (Details) - LightCyber Ltd. $ in Millions	Feb. 27, 2017 USD ($)
Finite-Lived Intangible Assets
Fair value of identified intangible assets acquired	$ 19.5
Developed technology
Finite-Lived Intangible Assets
Fair value of identified intangible assets acquired	$ 16.6
Estimated useful life (in years)	8 years
Customer relationships
Finite-Lived Intangible Assets
Fair value of identified intangible assets acquired	$ 2.9
Estimated useful life (in years)	8 years

Goodwill and Intangible Assets (Goodwill) (Details) $ in Millions	9 Months Ended
	Apr. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Balance as of July 31, 2016	$ 163.5
Goodwill acquired	75.3
Balance as of April 30, 2017	$ 238.8

Goodwill and Intangible Assets (Purchased Intangible Assets by Major Class) (Details) - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Finite-Lived Intangible Assets
Gross carrying amount	$ 83.9	$ 64.4
Accumulated amortization	(27.4)	(20.4)
Net carrying amount	56.5	44.0
Developed technology
Finite-Lived Intangible Assets
Gross carrying amount	69.7	53.1
Accumulated amortization	(21.3)	(15.4)
Net carrying amount	48.4	37.7
Acquired intellectual property
Finite-Lived Intangible Assets
Gross carrying amount	8.9	8.9
Accumulated amortization	(3.6)	(2.9)
Net carrying amount	5.3	6.0
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	2.9	0.0
Accumulated amortization	(0.1)	0.0
Net carrying amount	2.8	0.0
In-process research and development held for defensive purposes
Finite-Lived Intangible Assets
Gross carrying amount	1.9	1.9
Accumulated amortization	(1.9)	(1.6)
Net carrying amount	0.0	0.3
Other
Finite-Lived Intangible Assets
Gross carrying amount	0.5	0.5
Accumulated amortization	(0.5)	(0.5)
Net carrying amount	$ 0.0	$ 0.0

Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2.5	$ 2.3	$ 7.1	$ 7.1

Goodwill and Intangible Assets (Future Amortization Expense of Intangible Assets) (Details) - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2017	$ 2.7
2018	10.7
2019	10.6
2020	10.6
2021	8.9
2022 and thereafter	13.0
Net carrying amount	$ 56.5	$ 44.0

Convertible Senior Notes (Additional Information) (Details) $ / shares in Units, shares in Millions, $ in Millions	Apr. 30, 2017 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 \| $	$ 7.7
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 \| $	$ 671.3		$ 761.9

Convertible Senior Notes (Components of Convertible Senior Notes) (Details) - USD ($) $ in Millions	Apr. 30, 2017	Jul. 31, 2016
Debt Instruments [Abstract]
Principal	$ 575.0	$ 575.0
Less: debt discount and debt issuance costs, net of amortization	56.6	74.8
Net carrying amount	518.4	500.2
Equity	$ 109.8	$ 109.8

Convertible Senior Notes (Schedule of Interest Expense Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Debt Disclosure [Abstract]
Amortization of debt discount	$ 5.5	$ 5.3	$ 16.4	$ 15.7
Amortization of debt issuance costs	0.7	0.6	1.9	1.7
Total interest expense recognized	$ 6.2	$ 5.9	$ 18.3	$ 17.4
Effective interest rate of the liability component (in percentage)	4.80%	4.80%	4.80%	4.80%

Commitments and Contingencies (Lease Commitment) (Details) $ in Millions	Apr. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remaining 2017	$ 7.2
2018	29.7
2019	48.8
2020	52.2
2021	56.5
2022 and thereafter	318.5
Committed gross lease payments	512.9
Less: proceeds from sublease rental	2.9
Net operating lease obligation	$ 510.0

Commitments and Contingencies (Manufacturing Purchase Commitments) (Details) $ in Millions	Apr. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Manufacturing purchase commitments	$ 104.3

Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions			3 Months Ended	9 Months Ended
	Feb. 24, 2017	Aug. 26, 2016	Apr. 30, 2017	Apr. 30, 2017
Equity [Abstract]
Share repurchase, authorized amount	$ 500.0	$ 500.0
Share repurchase, total authorized amount			$ 1,000.0	$ 1,000.0
Shares repurchased and retired during the period (in shares)			1.1	2.4
Shares repurchased and retired during period, value			$ 125.0	$ 295.1
Share repurchase, remaining authorized repurchase amount			$ 704.9	$ 704.9

Equity Award Plans (Stock Option Activities) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Apr. 30, 2017	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)	(0.5)
Balance, ending (in shares)	1.6	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)	14.23
Balance, ending (in usd per share)	$ 13.20	$ 13.42
Options, Additional Disclosures
Weighted-average remaining contractual life (in years)	4 years 6 months	5 years 2 months
Aggregate intrinsic value	$ 156.7	$ 244.9
Options exercisable (in shares)	1.6
Options exercisable, weighted-average exercise price (in usd per share)	$ 13.20
Options exercisable, weighted-average remaining contractual term (in years)	4 years 6 months
Options exercisable, aggregate intrinsic value	$ 156.7

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	1 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2016	Apr. 30, 2017	Jul. 31, 2016
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
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
Granted (in shares)		0.3
Vested (in shares)		(0.3)
Forfeited (in shares)		0.0
Balance, ending (in shares)		1.1	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)		170.97
Forfeited (in usd per share)		0.00
Balance, ending (in usd per share)		$ 164.24	$ 170.97
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)		2.8
Vested (in shares)		(2.6)
Forfeited (in shares)		(0.4)
Balance, ending (in shares)		6.3	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)		143.28
Vested (in usd per share)		118.53
Forfeited (in usd per share)		137.88
Balance, ending (in usd per share)		$ 140.29	$ 130.14
RSUs, RSAs, and PSAs, Additional Disclosures
Weighted-average remaining contractual term (in years)		1 year 3 months	1 year 1 month
Aggregate intrinsic value		$ 687.1	$ 852.7

Equity Award Plans (Allocation of Share Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 117.4	$ 108.5	$ 358.0	$ 283.3
Total compensation cost not yet recognized, unvested awards	913.0		$ 913.0
Period for recognition of total compensation cost not yet recognized (in years)			2 years 6 months
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	1.8	1.6	$ 5.5	4.5
Cost of subscription and support revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	14.0	11.5	41.3	29.0
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	37.1	36.0	116.4	95.9
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	46.2	43.8	139.7	110.4
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 18.3	$ 15.6	$ 55.1	$ 43.5

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate (in percentage)	(14.50%)	(11.90%)	(9.10%)	(10.30%)
Unrecognized tax benefits	$ 289.1		$ 289.1		$ 127.7
Unrecognized tax benefits that would affect income tax expense	$ 29.2		$ 29.2		$ 21.9

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		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method
Net loss	$ (60.9)	$ (64.1)	$ (178.4)	$ (161.3)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	91.0	87.8	90.5	86.5
Net loss per share, basic and diluted (in usd per share)	$ (0.67)	$ (0.73)	$ (1.97)	$ (1.86)

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details) - shares shares in Millions	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	19.4	20.8
Restricted stock units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	6.3	7.0
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)	1.6	2.3
Restricted stock awards (RSAs) and performance-based stock awards (PSAs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	1.1	1.1