Palo Alto Networks (PANW) 10-Q 3 Jun 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Apr. 30, 2014	12-May-14
Document Information [Abstract]	'	'
Entity Registrant Name	'Palo Alto Networks Inc	'
Entity Central Index Key	'0001327567	'
Document Type	'10-Q	'
Document Period End Date	30-Apr-14	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Document Fiscal Year End Date	'--07-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	77,077,404

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Apr. 30, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$234,790	$310,614
Short-term investments	133,180	109,007
Accounts receivable, net of allowance for doubtful accounts of $693 and $51 at April 30, 2014 and July 31, 2013, respectively	114,789	87,461
Prepaid expenses and other current assets	33,686	22,617
Total current assets	516,445	529,699
Property and equipment, net	48,488	32,086
Long-term investments	103,902	17,314
Goodwill	155,086	0
Intangible assets, net	49,613	1,358
Other assets	6,853	5,149
Total assets	880,387	585,606
Current liabilities:	'	'
Accounts payable	24,641	15,544
Accrued and other liabilities	150,296	14,609
Accrued compensation	29,188	22,004
Deferred revenue	231,226	153,945
Total current liabilities	435,351	206,102
Deferred revenue—non-current	136,707	95,285
Other long-term liabilities	36,636	11,799
Commitments and contingencies (Note 6)	'	'
Stockholders' equity:	'	'
Preferred stock; $0.0001 par value; 100,000 shares authorized; none issued and outstanding at April 30, 2014 and July 31, 2013	0	0
Common stock; $0.0001 par value; 1,000,000 shares authorized; 77,055 and 71,612 shares issued and outstanding at April 30, 2014 and July 31, 2013, respectively	7	7
Additional paid-in capital	575,293	381,703
Accumulated other comprehensive gain (loss)	61	-16
Accumulated deficit	-303,668	-109,274
Total stockholders’ equity	271,693	272,420
Total liabilities and stockholders’ equity	$880,387	$585,606

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Apr. 30, 2014	Jul. 31, 2013
In Thousands, except Share data, unless otherwise specified
Current assets:	'	'
Allowance for doubtful accounts (in usd)	$693	$51
Stockholders' equity:	'	'
Preferred stock, par value (in usd per share)	$0.00	$0.00
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$0.00	$0.00
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued (in shares)	77,055,000	71,612,000
Common Stock, Shares, Outstanding (in shares)	77,055,000	71,612,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Revenue:	'	'	'	'
Product	$84,128	$60,793	$240,436	$178,251
Services	66,572	40,496	179,512	105,471
Total revenue	150,700	101,289	419,948	283,722
Cost of revenue:	'	'	'	'
Product	20,425	15,855	58,600	46,907
Services	19,285	11,835	52,421	32,591
Total cost of revenue	39,710	27,690	111,021	79,498
Total gross profit	110,990	73,599	308,927	204,224
Operating expenses:	'	'	'	'
Research and development	27,837	16,048	71,983	44,855
Sales and marketing	83,995	51,733	228,095	140,136
General and administrative	23,717	12,268	57,575	30,971
Legal settlement (Note 12)	121,173	0	141,173	0
Total operating expenses	256,722	80,049	498,826	215,962
Operating loss	-145,732	-6,450	-189,899	-11,738
Interest income	272	133	619	347
Other income (expense), net	145	-157	11	-387
Loss before income taxes	-145,315	-6,474	-189,269	-11,778
Provision for income taxes	1,272	808	5,125	1,632
Net loss	($146,587)	($7,282)	($194,394)	($13,410)
Net loss per share, basic and diluted	($1.96)	($0.10)	($2.66)	($0.20)
Weighted-average shares used to compute net loss per share, basic and diluted	74,967	69,575	73,127	67,980

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Net loss	($146,587)	($7,282)	($194,394)	($13,410)
Other comprehensive gain, net of tax:	'	'	'	'
Change in unrealized gains (losses) on investments	18	34	87	23
Reclassification adjustment for realized net gains on investments included in net loss	0	0	-10	0
Net change	18	34	77	23
Comprehensive loss	($146,569)	($7,248)	($194,317)	($13,387)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Cash flows from operating activities	'	'
Net loss	($194,394)	($13,410)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	11,638	7,221
Amortization of investment premiums, net of accretion of purchase discounts	1,180	1,445
Share-based compensation for equity based awards	66,685	29,608
Excess tax benefit from share-based compensation	-758	-177
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-27,220	-45,847
Prepaid expenses and other assets	-7,926	-5,991
Accounts payable	8,965	3,347
Accrued and other liabilities	137,835	13,097
Deferred revenue	118,551	83,496
Net cash provided by operating activities	114,556	72,789
Cash flows from investing activities	'	'
Purchase of property, equipment, and other assets	-31,379	-16,595
Purchase of investments	-316,911	-310,683
Proceeds from sales of investments	6,630	13,491
Proceeds from maturities of investments	198,080	117,150
Acquisition of business, net of cash acquired	-85,726	0
Net cash used in investing activities	-229,306	-196,637
Cash flows from financing activities	'	'
Excess tax benefit from share-based compensation	758	177
Proceeds from exercise of stock options	25,431	11,195
Proceeds from employee stock purchase plan	12,869	6,267
Repurchase of restricted common stock from terminated employees	-132	-71
Payment of initial public offering costs	0	-2,698
Net cash provided by financing activities	38,926	14,870
Net decrease in cash and cash equivalents	-75,824	-108,978
Cash and cash equivalents—beginning of period	310,614	322,642
Cash and cash equivalents—end of period	$234,790	$213,664

Description_of_Business_and_Su

Description of Business and Summary of Significant Accounting Policies	9 Months Ended
	Apr. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Description of Business and Summary of Significant Accounting Policies	'
	Description of Business and Summary of Significant Accounting Policies
	Description of Business
	Palo Alto Networks, Inc. (the “Company,” “we,” “us,” or “our”), located in Santa Clara, California, was incorporated in March 2005 under the laws of the State of Delaware and commenced operations in April 2005. We offer a next-generation enterprise security platform that allows enterprises, service providers, and government entities to simultaneously empower and secure their organization by safely enabling the increasingly complex and rapidly growing number of applications running on their networks and preventing breaches stemming from targeted cyber attacks. Our enterprise security platform consists of three major elements: our Next-Generation Firewall, our Next-Generation Endpoint Protection, and our Next-Generation Threat Intelligence Cloud. Our Next-Generation Firewall delivers application, user, and content visibility and control as well as protection against network based cyber threats integrated within the firewall through our proprietary hardware and software architecture. Our Next-Generation Endpoint Protection protects against cyber attacks that aim to exploit software vulnerabilities on a broad variety of fixed and virtual endpoints. Our Next-Generation Threat Intelligence Cloud provides central intelligence capabilities as well as automation of delivery of preventative measures against cyber attacks. We primarily sell our products and services to end-customers through our channel partners and infrequently directly to end-customers. Our partners are supported by our sales and marketing organization in the Americas, in Europe, the Middle East, and Africa (EMEA), and in Asia Pacific and Japan (APAC).
	Basis of Presentation
	The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, consistent in all material respects with those applied in our Annual Report on Form 10-K for the fiscal year ended July 31, 2013. The condensed consolidated financial statements include all adjustments necessary for a fair presentation of our quarterly results. All adjustments are of a normal recurring nature. We have made estimates and judgments affecting the amounts reported in our condensed consolidated financial statements and the accompanying notes. The actual results that we experience may differ materially from our estimates. Certain prior period amounts have been reclassified to conform with current period presentation.
	Principles of Consolidation
	The condensed consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
	Summary of Significant Accounting Policies
	There have been no material changes to our significant accounting policies as of and for the three and nine months ended April 30, 2014, as compared to the significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended July 31, 2013, except for the inclusion of a policy related to business combinations, amortization of intangible assets, and broadening our policy on the Impairment of Long-Lived Assets to include policies related to goodwill and intangible assets.
	Business Combinations
	We include the results of operations of the businesses that we acquire as of the respective dates of acquisition. We allocate the fair value of the purchase price of our acquisitions to the tangible assets acquired, liabilities assumed, and intangible assets acquired, based on their estimated fair values. The excess of the purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill. Additional information existing as of the acquisition date but unknown to us may become known during the remainder of the measurement period, not to exceed 12 months from the acquisition date, which may result in changes to the amounts and allocations recorded.
	Amortization of Intangible Assets
	Purchased intangible assets with finite lives are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets. Acquisition-related in-process research and development represents the fair value of incomplete research and development projects that have not reached technological feasibility as of the date of acquisition. Initially, these assets are not subject to amortization. Assets related to projects that have been completed are transferred to developed technology, which are subject to amortization, while assets related to projects that have been abandoned are impaired and expensed to research and development.
	Impairment of Goodwill, Intangible Assets, and Long-Lived Assets
	Goodwill is evaluated for impairment on an annual basis in the fourth quarter of our fiscal year, and whenever events or changes in circumstances indicate the carrying amount of goodwill may not be recoverable. We have elected to first assess qualitative factors to determine whether it is more likely than not that the fair value of our single reporting unit is less than its carrying amount. If we determine that it is more likely than not that the fair value of our single reporting unit is less than its carrying amount, then the two-step goodwill impairment test will be performed. The first step, identifying a potential impairment, compares the fair value of our single reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step will be performed; otherwise, no further step is required. The second step, measuring the impairment loss, compares the implied fair value of the goodwill with the carrying amount of the goodwill. Any excess of the goodwill carrying amount over the implied fair value is recognized as an impairment loss.
	We evaluate events and changes in circumstances that could indicate carrying amounts of purchased intangible assets and long-lived assets may not be recoverable. When such events or changes in circumstances occur, we assess the recoverability of these assets by determining whether or not the carrying amount will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, we record an impairment loss for the amount by which the carrying amount of the asset exceeds the fair value of the asset.
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740)-Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard requires us to present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss (NOL) carryforward or other tax credit carryforward when settlement in this manner is available under applicable tax law. The guidance is effective for us in the first quarter of fiscal 2015 and will be applied prospectively. Early adoption is permitted. We do not believe the adoption of this guidance will have a material impact on our condensed consolidated financial statements.
	In February 2013, the FASB issued Accounting Standards Update No. 2013-02, Comprehensive Income (Topic 220)-Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The standard requires entities to present (either on the face of the income statement or in the notes) the effects on the line items of the income statement for amounts reclassified out of accumulated other comprehensive income. The guidance was effective for us in the first quarter of fiscal 2014. Our adoption of this guidance did not impact our financial statements as the guidance is related to disclosure only and we did not have significant reclassifications out of accumulated other comprehensive income.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Apr. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	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 (in thousands):
			April 30, 2014								July 31, 2013
			Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Certificates of deposit		$	—	$	—	$	—	$	—	$	1,822	$	—	$	—	$	1,822
	U.S. government and agency securities		—		4,000		—		4,000		—		46,700		—		46,700
	Money market funds		—		—		—		—		131,845		—		—		131,845
	Total cash equivalents		—		4,000		—		4,000		133,667		46,700		—		180,367
	Short-term investments:
	Corporate debt securities		—		27,583		—		27,583		—		32,834		—		32,834
	U.S. government and agency securities		—		105,597		—		105,597		—		76,173		—		76,173
	Total short-term investments		—		133,180		—		133,180		—		109,007		—		109,007
	Long-term investments:
	Certificates of deposit		—		3,001		—		3,001		—		—		—		—
	Corporate debt securities		—		18,390		—		18,390		—		12,317		—		12,317
	U.S. government and agency securities		—		82,511		—		82,511		—		4,997		—		4,997
	Total long-term investments		—		103,902		—		103,902		—		17,314		—		17,314
	Other assets:
	Restricted cash		1,220		—		—		1,220		1,221		—		—		1,221
	Total other assets		1,220		—		—		1,220		1,221		—		—		1,221
	Total assets measured at fair value		$	1,220	$	241,082	$	—	$	242,302	$	134,888	$	173,021	$	—	$	307,909

Investments

Investments	9 Months Ended
	Apr. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	Investments
	The following tables summarize our unrealized gains and losses and fair value of investments as of April 30, 2014 and July 31, 2013 (in thousands):
		30-Apr-14
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	3,000	$	1		$	—		$	3,001
	Corporate debt securities	45,957		22			(6		)	45,973
	U.S. government and agency securities	192,064		68			(24		)	192,108
	Total	$	241,021	$	91		$	(30	)	$	241,082
		31-Jul-13
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	1,822	$	—		$	—		$	1,822
	Corporate debt securities	45,173		12			(34		)	45,151
	U.S. government and agency securities	127,864		8			(2		)	127,870
	Money market funds	131,845		—			—			131,845
	Total	$	306,704	$	20		$	(36	)	$	306,688
	The following tables present our investments that were in an unrealized loss position as of April 30, 2014 and July 31, 2013 (in thousands):
		30-Apr-14
		Less Than 12 Months					12 Months or Greater					Total
		Fair Value		Unrealized Loss			Fair Value			Unrealized Loss		Fair Value		Unrealized Loss
	Corporate debt securities	16,766		(6		)	—			—		16,766		(6		)
	U.S. government and agency securities	33,601		(24		)	—			—		33,601		(24		)
	Total	$	50,367	$	(30	)	$	—		$	—	$	50,367	$	(30	)
		31-Jul-13
		Less Than 12 Months					12 Months or Greater					Total
		Fair Value		Unrealized Loss			Fair Value			Unrealized Loss		Fair Value		Unrealized Loss
	Corporate debt securities	$	31,429	$	(34	)	$	—		$	—	$	31,429	$	(34	)
	U.S. government and agency securities	15,926		(2		)	—			—		15,926		(2		)
	Total	$	47,355	$	(36	)	$	—		$	—	$	47,355	$	(36	)
	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 more likely than not that we would be required to sell these investments before recovery of their amortized cost basis, which may be at maturity. As a result, there is no other-than-temporary impairment for these investments at April 30, 2014.
	The following table summarizes the amortized cost and fair value of our investments as of April 30, 2014, by contractual years-to-maturity (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	137,154	$	137,180
	Due within one to two years	103,867		103,902
	Total	$	241,021	$	241,082

Acquisitions_Notes

Acquisitions (Notes)	9 Months Ended
	Apr. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	Acquisitions
	Business Combinations
	Cyvera Ltd.
	On April 9, 2014, we completed our acquisition of Cyvera Ltd. (“Cyvera”), a privately-held cybersecurity company located in Tel Aviv, Israel. The acquisition extends our next-generation security platform with an innovative approach to preventing attacks on the endpoint. We have accounted for this transaction as a business combination in exchange for total consideration of approximately $177,647,000, which consisted of the following (in thousands):
		Amount
	Cash	$	90,170
	Common stock (1,281,000 shares)	87,477
	Total	$	177,647
	As part of the acquisition, we agreed to replace Cyvera's unvested options with our restricted stock units with an estimated fair value of $6,353,000. Of the total estimated fair value, a portion was allocated to the purchase consideration and the remainder was allocated to future services and will be expensed over the remaining service periods on a straight-line basis as share-based compensation.
	In addition, we issued 276,000 shares of restricted common stock with a total fair value of $17,612,000 to certain Cyvera employees. The restriction on these shares will be released over a period of three years from the acquisition date, subject to continued employment. These shares were excluded from the purchase consideration and are being expensed over the remaining service periods on a straight-line basis as share-based compensation.
	We expensed the related acquisition costs in the amount of $3,583,000 in general and administrative expenses in the three and nine months ended April 30, 2014.
	The following table summarizes our preliminary allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Cash	$	6,930
	Goodwill	144,992
	Identified intangible assets	42,300
	Accrued and other liabilities, net	(6,950		)
	Long-term deferred tax liability, net	(9,625		)
	Total	$	177,647
	We expect to finalize the valuation as soon as practicable, but not later than 12 months from the acquisition date.
	The following table presents details of the identified intangible assets acquired (in thousands, except years):
		Fair Value			Estimated Useful Life
	Developed technology	$	34,500		7 years
	In-process research and development	7,600			N/A
	Other	200			2 years
	Total	$	42,300
	Goodwill generated from this business combination is primarily attributable to the assembled workforce and synergies from combined selling opportunities of both network security products and endpoint security products. The goodwill is not tax deductible for Israeli income tax purposes.
	Cyvera’s operating results are included in our Condensed Consolidated Statements of Operations from the date of the acquisition and are considered immaterial for purposes of financial disclosures.
	The following table presents the unaudited pro forma financial information for the three and nine months ended April 30, 2014 and 2013, as though the companies were combined as of August 1, 2012 (in thousands):
		Three Months Ended April 30,						Nine Months Ended April 30,
		2014			2013			2014			2013
	Total revenue	$	150,732		$	101,295		$	420,023		$	283,739
	Net loss	$	(149,776	)	$	(10,744	)	$	(210,276	)	$	(23,502	)
	The pro forma financial information for the three and nine months ended April 30, 2014 and 2013 has been calculated after adjusting the results of Cyvera to reflect the business combination accounting effects resulting from this acquisition as though the acquisition occurred as of August 1, 2012, including the amortization expense from acquired intangible assets and post-acquisition share-based compensation expense related to restricted common stock and the replacement of unvested Cyvera options. The pro forma financial information is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of our fiscal 2013.
	The pro forma financial information for the three and nine months ended April 30, 2014 and 2013 combines the historical results of the Company for the three and nine months ended April 30, 2014 and 2013 and the adjusted historical results of Cyvera for the three and nine months ended March 31, 2014 and 2013, due to differences in reporting periods and considering the date the Company acquired Cyvera.
	Morta Security, Inc.
	On December 26, 2013, we completed our acquisition of Morta Security, Inc. ("Morta"), a privately-held cybersecurity company. We have accounted for this transaction as a business combination and exchanged total cash consideration of $10,345,000, of which $2,500,000 was withheld for Morta's indemnification obligations. Morta brings us a team of cybersecurity experts which will enhance the proven detection and prevention capabilities of our WildFire offering.
	The following table summarizes our preliminary allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Goodwill	$	10,094
	Identified intangible assets	2,200
	Net liabilities assumed	(1,949		)
	Total	$	10,345
	The following table presents details of the identified intangible assets acquired (in thousands, except years):
		Fair Value			Estimated Useful Life
	In-process research and development held for defensive purposes	$	1,900		3 years
	Other	300			2 years
	Total	$	2,200
	Morta’s operating results are included in our Condensed Consolidated Statements of Operations from the date of the acquisition and are considered immaterial for purposes of pro forma financial disclosures. Goodwill generated from this business combination is primarily attributable to human capital with threat intelligence experience and capabilities, and is not tax deductible for U.S. federal income tax purposes.
	Other Purchased Intangible Assets
	On September 4, 2013 we entered into an agreement to purchase intellectual property for $5,000,000, which is being amortized over a weighted-average period of 13 years.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Apr. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets Disclosure	'
	Goodwill and Intangible Assets
	Goodwill
	The following table presents details of our goodwill during the nine months ended April 30, 2014 (in thousands):
		Gross Carrying Amount		Accumulated Impairment Loss			Net Carrying Amount
	Balance as of July 31, 2013	$	—	$	—		$	—
	Goodwill acquired	155,086		—			155,086
	Balance as of April 30, 2014	$	155,086	$	—		$	155,086
	Purchased Intangible Assets
	The following tables present details of our purchased intangible assets as of April 30, 2014 and July 31, 2013 (in thousands):
		30-Apr-14
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Intangible assets with finite lives:
	Developed technology	$	34,500	$	(411	)	$	34,089
	Acquired intellectual property	6,546		(753		)	5,793
	In-process research and development held for defensive purposes	1,900		(212		)	1,688
	Other	500		(57		)	443
	Total intangible assets with finite lives	43,446		(1,433		)	42,013
	In-process research and development with indefinite lives	7,600		—			7,600
	Total purchased intangible assets	$	51,046	$	(1,433	)	$	49,613
		31-Jul-13
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Acquired intellectual property	$	1,546	$	(188	)	$	1,358
	Amortization expense was $820,000 and $1,245,000 for the three and nine months ended April 30, 2014, respectively, and $42,000 and $68,000 for the three and nine months ended April 30, 2013, respectively.
	The following table summarizes our estimated future amortization expense of intangible assets with finite lives by type as of April 30, 2014 (in thousands):
		Fiscal Years Ending July 31,
		Remaining 2014		2015			2016		2017		2018		2019 and Thereafter
	Developed technology	$	1,232	$	4,928		$	4,928	$	4,928	$	4,928	$	13,145
	Acquired intellectual property	205		761			704		611		484		3,028
	In-process research and development held for defensive purposes	158		633			633		264		—		—
	Other	63		250			130		—		—		—
	Total future amortization expense	$	1,658	$	6,572		$	6,395	$	5,803	$	5,412	$	16,173

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Apr. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Leases
	We lease our facilities under various non-cancelable operating leases, which expire through the year ending July 31, 2023.
	The following table presents details of the aggregate future non-cancelable minimum rental payments on our operating leases as of April 30, 2014 (in thousands):
		Amount
	Fiscal years ending July 31:
	Remaining 2014	$	2,930
	2015	13,778
	2016	14,018
	2017	13,052
	2018	11,774
	2019 and thereafter	52,300
	Committed gross lease payments	107,852
	Less: proceeds from sublease rental	10,700
	Net operating lease obligation	$	97,152
	Contract Manufacturer Commitments
	Our independent contract manufacturer procures components and assembles our products based on our forecasts. These forecasts are based on estimates of future demand for our products, which are in turn based on historical trends and an analysis from our sales and product marketing organizations, adjusted for overall market conditions. In order to reduce manufacturing lead times and plan for adequate supply, we may issue forecasts and orders for components and products that are non-cancelable. Obligations under contracts that we can cancel without a significant penalty are not included. As of April 30, 2014, we had $29,407,000 of open orders.
	Litigation
	In December 2011, Juniper Networks, Inc. ("Juniper") filed a complaint against us in the United States District Court for the District of Delaware alleging patent infringement. The complaint sought preliminary and permanent injunctions against infringement, treble damages, and attorneys' fees. On September 4, 2012, Juniper filed a motion to amend its complaint to allege that our appliances infringe two additional U.S. patents but also to withdraw its allegations as to a previously-asserted patent. This amended complaint was officially filed on September 25, 2012, pursuant to a stipulation between the parties. On October 12, 2012, we filed an answer to Juniper’s amended complaint, which denied that we infringed Juniper’s patents and asserted that Juniper’s patents were invalid. The Court issued an order on February 6, 2014, in which the Court construed several disputed claim limitations, granted Juniper’s motion for summary judgment of assignor estoppel, precluding us from raising in the litigation challenges to the validity of Juniper’s patents, denied Juniper’s motion for summary judgment of infringement, and granted in part and denied in part our motion for summary judgment of non-infringement. A trial took place in February 2014. Following the trial, the jury was unable to reach a verdict and the Court declared a mistrial.
	On September 13, 2012, we filed with the U.S. Patent and Trademark Office requests for inter partes reexamination of five of the six patents asserted by Juniper in its original complaint. On October 19 and December 3, 2012, the U.S. Patent and Trademark Office granted our requests for reexamination for three patents, rejecting a number of the claims asserted in the litigation, and on November 15 and 26, 2012, the U.S. Patent and Trademark Office denied our requests for reexamination as to two other patents. On June 20, 2013 and July 23, 2013, we filed with the U.S. Patent and Trademark Office petitions for inter partes review for two other patents asserted by Juniper in the litigation. A hearing to resolve claim construction issues, as well as motions for summary judgment, was heard on November 15, 2013.
	On September 30, 2013, we filed a lawsuit against Juniper in the United States District Court for the Northern District of California. The lawsuit alleged that Juniper’s products infringe three of our U.S. patents, and sought monetary damages and a permanent injunction. On November 21, 2013, Juniper filed an answer and counterclaims in a separate action in the United States District Court for the Northern District of California. In its counterclaims Juniper sought a declaration that the asserted patents owned by us are not infringed and are invalid. Juniper’s counterclaims also asserted that our products infringe three additional Juniper patents.
	On May 27, 2014, we entered into a Settlement, Release and Cross-License Agreement (the “settlement agreement”) with Juniper to resolve all pending litigation between the parties, including those discussed above. Refer to Note 12 Subsequent Events for more information on the settlement agreement.
	In addition to the above matter, we are subject to legal proceedings, claims, and litigation arising in the ordinary course of business, including intellectual property litigation. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. We accrue for contingencies when we believe that a loss is probable and that we can reasonably estimate the amount of any such loss. We have made an assessment of the probability of incurring any such losses and whether or not those losses are estimable.
	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.

Mutual_Covenant_Not_to_Sue_and

Mutual Covenant Not to Sue and Release Agreement (Notes)	9 Months Ended
	Apr. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Mutual Covenant Not to Sue and Release Agreement	'
	On January 27, 2014, we executed a Mutual Covenant Not to Sue and Release Agreement with Fortinet, Inc., thereby extending an existing covenant for six more years. We evaluated the transaction as a multiple-element arrangement and allocated the one-time payment that we made in the amount of $20,000,000 to each identifiable element using its relative fair value. Based on our estimates of fair value, we determined that the primary benefit of the arrangement is avoided litigation cost and the release of any potential past claims, with no material value attributable to future use or benefit. Accordingly, we recorded a $20,000,000 settlement charge within operating expenses during the three months ended January 31, 2014.

Equity_Award_Plans

Equity Award Plans	9 Months Ended
	Apr. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity Award Plans	'
	Equity Award Plans
	Stock Option Activities
	A summary of the activity under our stock plans and changes during the reporting period and a summary of information related to options exercisable, vested, and expected to vest are presented below (in thousands, except per share amounts):
		Options Outstanding
		Number			Weighted-				Weighted-		Aggregate
		of			Average				Average		Intrinsic
		Shares			Exercise				Remaining		Value
					Price				Contractual
									Term
									(Years)
	Balance—July 31, 2013	10,033			$	11.74			7.8		$	373,228
	Options granted	—			—
	Options forfeited	(488	)		15.17
	Options exercised	(2,949	)		8.62
	Balance—April 30, 2014	6,596			12.88				7.3		$	334,417
	Options vested and expected to vest—April 30, 2014	6,410			$	12.77			7.3		$	325,692
	Options exercisable—April 30, 2014	3,668			$	10.25			7		$	195,614
	Restricted Stock Units (RSUs) Activities
	A summary of the activity under our stock plans and changes during the reporting period and a summary of information related to RSUs vested and expected to vest are presented below (in thousands, except per share amounts):
		RSUs Outstanding
		Number			Weighted-				Weighted-		Aggregate
		of			Average				Average		Intrinsic
		Shares			Grant-Date Fair Value Per Share				Remaining		Value
									Contractual
									Term
									(Years)
	Balance—July 31, 2013	2,241			$	54.36			1.5		$	109,675
	RSUs granted	4,073			56.77
	RSUs vested	(646	)		55.95
	RSUs forfeited	(358	)		55.29
	Balance—April 30, 2014	5,310			$	55.95			1.5		$	337,610
	RSUs vested and expected to vest—April 30, 2014	4,782			$	55.89			1.4		$	304,040
	Shares Available for Grant
	The following table presents the stock activity and the total number of shares available for grant as of April 30, 2014 (in thousands):
		Number of Shares
	Balance—July 31, 2013	8,932
	Authorized	3,223
	RSUs granted	(4,073	)
	Repurchased	27
	Options forfeited	488
	RSUs forfeited	358
	Balance—April 30, 2014	8,955
	Employee Stock Purchase Plan (ESPP)
	Compensation expense recognized in connection with the 2012 Employee Stock Purchase Plan was $1,142,000 and $3,217,000 for the three and nine months ended April 30, 2014, respectively, and $1,132,000 and $3,943,000 for the three and nine months ended April 30, 2013, respectively.
	Share-Based Compensation
	The following table summarizes the assumptions used to value grants related to the 2012 ESPP in each period:
		Three Months Ended April 30,				Nine Months Ended April 30,
		2014		2013		2014		2013
	Risk-free interest rate	0.10%		0.10%		0.10%		0.10%
	Expected term (years)	<1 year		<1 year		<1 year		<1 year
	Volatility	41%		41%		40%		41%
	Dividend yield	—%		—%		—%		—%
	The following table summarizes share-based compensation included in costs and expenses (in thousands):
		Three Months Ended April 30,								Nine Months Ended April 30,
		2014				2013				2014			2013
	Cost of revenue	$	3,156			$	1,364			$	7,311		$	2,799
	Research and development	8,666				3,024				17,825			6,687
	Sales and marketing	12,372				5,686				29,050			13,919
	General and administrative	3,798				2,560				12,601			6,325
	Total	$	27,992			$	12,634			$	66,787		$	29,730
	At April 30, 2014, total compensation cost related to unvested share-based awards granted to employees under our stock plans but not yet recognized was $282,866,000, net of estimated forfeitures. This cost is expected to be amortized on a straight-line basis over a weighted-average period of three years. Future grants will increase the amount of compensation expense to be recorded in these periods.
	During the nine months ended April 30, 2014, we accelerated the vesting of certain share-based awards and as a result, in the three and nine months ended April 30, 2014, we recorded compensation expense within general and administrative expense of $62,000 and $3,446,000, respectively.
	During the three months ended October 31, 2012, we modified the terms of certain share-based awards and as a result, in the three and nine months ended April 30, 2013, we recorded compensation expense within sales and marketing expense of nil and $1,861,000, respectively.

Income_Taxes

Income Taxes	9 Months Ended
	Apr. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Our provision for income taxes for the three and nine months ended April 30, 2014 reflects an effective tax rate of negative 1% and negative 3%, respectively. Our effective tax rates for these periods were negative due to the fact that we recorded a provision for income taxes on year-to-date losses. The key components of our income tax provision, and the related effective tax rate, consist of foreign tax losses which derive no benefit, non-deductible share-based compensation and foreign withholding taxes. As compared to the same periods last year, our negative effective tax rate changed due to fluctuations in our overall loss before income taxes and the geographic mix of income due to global expansion.
	Our provision for income taxes for the three and nine months ended April 30, 2013 reflects an effective tax rate of negative 12% and negative 14%, respectively, and consists of foreign income and withholding taxes.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	9 Months Ended
	Apr. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	Net Income (Loss) Per Share
	Basic net income (loss) per common share is computed by dividing net income (loss) by basic weighted-average shares outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) by diluted weighted-average shares outstanding, including potentially dilutive securities.
	The following table presents the computation of basic and diluted net loss per share of common stock (in thousands, except per share data):
		Three Months Ended							Nine Months Ended
		April 30,							April 30,
		2014				2013			2014			2013
	Net loss	$	(146,587	)		$	(7,282	)	$	(194,394	)	$	(13,410	)
	Weighted-average shares used to compute net loss per share, basic and diluted	74,967				69,575			73,127			67,980
	Net loss per share, basic and diluted	$	(1.96	)		$	(0.10	)	$	(2.66	)	$	(0.20	)
	The following outstanding options, RSUs, and ESPP shares were excluded from the computation of diluted net loss per common share for the periods presented as their effects would have been antidilutive (in thousands):
		30-Apr-14			30-Apr-13
	Options to purchase common stock	6,596			10,637
	RSUs	5,310			1,798
	ESPP shares	41			—

Related_Party_Transactions_Not

Related Party Transactions (Notes)	9 Months Ended
	Apr. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	Certain members of our board of directors serve as board members or executive officers of certain of our customers and in some cases are also investors of these customers. We believe these transactions with related party customers are carried out on terms that are consistent with similar transactions with our comparable customers. We had sales transactions with significant related party customers of $1,619,000 and $3,776,000 for the three and nine months ended April 30, 2014, respectively, and $903,000 and $2,381,000 for the three and nine months ended April 30, 2013, respectively. Amounts payable to and due from related party customers were not material at April 30, 2014.

Subsequent_Event_Notes

Subsequent Event (Notes)	9 Months Ended
	Apr. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On May 27, 2014, we entered into a Settlement, Release and Cross-License Agreement with Juniper, whereby we resolved all pending litigation matters. Under the terms of the settlement agreement, we agreed to pay Juniper a one-time settlement amount of approximately $175,000,000, which was comprised of $75,000,000 in cash, 1,081,000 shares of our common stock with an approximate value of $70,000,000, and a warrant to purchase 463,000 shares of our common stock with an approximate value of $30,000,000, in exchange for the following:
	•	Mutual dismissal with prejudice of all pending litigation between the parties and general release of all liability for Palo Alto Networks and Juniper,
	•	Cross-license between both parties for the patents-in-suit and associated family members and counterparts worldwide for the life of the patents, and
	•	Mutual covenant not to sue for infringement of any other patents for a period of eight years.
	For accounting purposes, the fair value of the total consideration as of the settlement date was $182,473,000 . The fair values of the common stock and warrant were measured using the closing price of our common stock on the settlement date.
	We accounted for the settlement agreement as a multiple element arrangement and allocated the fair value of the consideration as of the settlement date to the identifiable elements based on their estimated fair values. Of the total settlement amount, $61,300,000 was allocated to the licensing of intellectual property, $54,300,000 was allocated to the mutual dismissal of claims, and the remaining amount was allocated to the mutual covenant not to sue. The mutual dismissal of claims and the covenant not to sue have no identifiable future benefit, and as a result we accrued a settlement charge within operating expenses as of and for the three and nine months ended April 30, 2014. The licensing of intellectual property will be recorded in our fiscal fourth quarter and will be amortized over the estimated period of benefit of five years.
	The warrant entitles Juniper to purchase up to 463,000 shares of common stock at an exercise price of $0.0001 per share and will expire seven months from the date of its issuance. Once issued, the liability-classified warrant will be remeasured through earnings at the end of each reporting period until exercised. The amount of future remeasurement is undeterminable and will be driven predominantly by increases or decreases in our stock price.

Description_of_Business_and_Su1

Description of Business and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Apr. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, consistent in all material respects with those applied in our Annual Report on Form 10-K for the fiscal year ended July 31, 2013. The condensed consolidated financial statements include all adjustments necessary for a fair presentation of our quarterly results. All adjustments are of a normal recurring nature. We have made estimates and judgments affecting the amounts reported in our condensed consolidated financial statements and the accompanying notes. The actual results that we experience may differ materially from our estimates. Certain prior period amounts have been reclassified to conform with current period presentation.
Principles of Consolidation	'
	Principles of Consolidation
	The condensed consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Business Combinations	'
	Business Combinations
	We include the results of operations of the businesses that we acquire as of the respective dates of acquisition. We allocate the fair value of the purchase price of our acquisitions to the tangible assets acquired, liabilities assumed, and intangible assets acquired, based on their estimated fair values. The excess of the purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill. Additional information existing as of the acquisition date but unknown to us may become known during the remainder of the measurement period, not to exceed 12 months from the acquisition date, which may result in changes to the amounts and allocations recorded.
Amortization of Intangible Assets	'
	Amortization of Intangible Assets
	Purchased intangible assets with finite lives are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets. Acquisition-related in-process research and development represents the fair value of incomplete research and development projects that have not reached technological feasibility as of the date of acquisition. Initially, these assets are not subject to amortization. Assets related to projects that have been completed are transferred to developed technology, which are subject to amortization, while assets related to projects that have been abandoned are impaired and expensed to research and development.
Goodwill, Intangible Assets and Impairment of Long-lived Assets	'
	Goodwill, Intangible Assets, and Long-Lived Assets
	Goodwill is evaluated for impairment on an annual basis in the fourth quarter of our fiscal year, and whenever events or changes in circumstances indicate the carrying amount of goodwill may not be recoverable. We have elected to first assess qualitative factors to determine whether it is more likely than not that the fair value of our single reporting unit is less than its carrying amount. If we determine that it is more likely than not that the fair value of our single reporting unit is less than its carrying amount, then the two-step goodwill impairment test will be performed. The first step, identifying a potential impairment, compares the fair value of our single reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step will be performed; otherwise, no further step is required. The second step, measuring the impairment loss, compares the implied fair value of the goodwill with the carrying amount of the goodwill. Any excess of the goodwill carrying amount over the implied fair value is recognized as an impairment loss.
	We evaluate events and changes in circumstances that could indicate carrying amounts of purchased intangible assets and long-lived assets may not be recoverable. When such events or changes in circumstances occur, we assess the recoverability of these assets by determining whether or not the carrying amount will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, we record an impairment loss for the amount by which the carrying amount of the asset exceeds the fair value of the asset.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740)-Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard requires us to present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss (NOL) carryforward or other tax credit carryforward when settlement in this manner is available under applicable tax law. The guidance is effective for us in the first quarter of fiscal 2015 and will be applied prospectively. Early adoption is permitted. We do not believe the adoption of this guidance will have a material impact on our condensed consolidated financial statements.
	In February 2013, the FASB issued Accounting Standards Update No. 2013-02, Comprehensive Income (Topic 220)-Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The standard requires entities to present (either on the face of the income statement or in the notes) the effects on the line items of the income statement for amounts reclassified out of accumulated other comprehensive income. The guidance was effective for us in the first quarter of fiscal 2014. Our adoption of this guidance did not impact our financial statements as the guidance is related to disclosure only and we did not have significant reclassifications out of accumulated other comprehensive income.
Fair Value Measurements	'
	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.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Apr. 30, 2014
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 (in thousands):
		April 30, 2014								July 31, 2013
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Certificates of deposit	$	—	$	—	$	—	$	—	$	1,822	$	—	$	—	$	1,822
	U.S. government and agency securities	—		4,000		—		4,000		—		46,700		—		46,700
	Money market funds	—		—		—		—		131,845		—		—		131,845
	Total cash equivalents	—		4,000		—		4,000		133,667		46,700		—		180,367
	Short-term investments:
	Corporate debt securities	—		27,583		—		27,583		—		32,834		—		32,834
	U.S. government and agency securities	—		105,597		—		105,597		—		76,173		—		76,173
	Total short-term investments	—		133,180		—		133,180		—		109,007		—		109,007
	Long-term investments:
	Certificates of deposit	—		3,001		—		3,001		—		—		—		—
	Corporate debt securities	—		18,390		—		18,390		—		12,317		—		12,317
	U.S. government and agency securities	—		82,511		—		82,511		—		4,997		—		4,997
	Total long-term investments	—		103,902		—		103,902		—		17,314		—		17,314
	Other assets:
	Restricted cash	1,220		—		—		1,220		1,221		—		—		1,221
	Total other assets	1,220		—		—		1,220		1,221		—		—		1,221
	Total assets measured at fair value	$	1,220	$	241,082	$	—	$	242,302	$	134,888	$	173,021	$	—	$	307,909

Investments_Tables

Investments (Tables)	9 Months Ended
	Apr. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Schedule of available-for-sale investments	'
	The following tables summarize our unrealized gains and losses and fair value of investments as of April 30, 2014 and July 31, 2013 (in thousands):
		30-Apr-14
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	3,000	$	1		$	—		$	3,001
	Corporate debt securities	45,957		22			(6		)	45,973
	U.S. government and agency securities	192,064		68			(24		)	192,108
	Total	$	241,021	$	91		$	(30	)	$	241,082
		31-Jul-13
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	1,822	$	—		$	—		$	1,822
	Corporate debt securities	45,173		12			(34		)	45,151
	U.S. government and agency securities	127,864		8			(2		)	127,870
	Money market funds	131,845		—			—			131,845
	Total	$	306,704	$	20		$	(36	)	$	306,688
Schedule of available-for-sale investments in unrealized loss position	'
	The following tables present our investments that were in an unrealized loss position as of April 30, 2014 and July 31, 2013 (in thousands):
		30-Apr-14
		Less Than 12 Months					12 Months or Greater					Total
		Fair Value		Unrealized Loss			Fair Value			Unrealized Loss		Fair Value		Unrealized Loss
	Corporate debt securities	16,766		(6		)	—			—		16,766		(6		)
	U.S. government and agency securities	33,601		(24		)	—			—		33,601		(24		)
	Total	$	50,367	$	(30	)	$	—		$	—	$	50,367	$	(30	)
		31-Jul-13
		Less Than 12 Months					12 Months or Greater					Total
		Fair Value		Unrealized Loss			Fair Value			Unrealized Loss		Fair Value		Unrealized Loss
	Corporate debt securities	$	31,429	$	(34	)	$	—		$	—	$	31,429	$	(34	)
	U.S. government and agency securities	15,926		(2		)	—			—		15,926		(2		)
	Total	$	47,355	$	(36	)	$	—		$	—	$	47,355	$	(36	)
Contractual maturities of available-for-sale investments	'
	The following table summarizes the amortized cost and fair value of our investments as of April 30, 2014, by contractual years-to-maturity (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	137,154	$	137,180
	Due within one to two years	103,867		103,902
	Total	$	241,021	$	241,082

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Apr. 30, 2014
Cyvera, Ltd.	'
Business Acquisition [Line Items]	'
Schedule of consideration	'
	We have accounted for this transaction as a business combination in exchange for total consideration of approximately $177,647,000, which consisted of the following (in thousands):
		Amount
	Cash	$	90,170
	Common stock (1,281,000 shares)	87,477
	Total	$	177,647
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes our preliminary allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Cash	$	6,930
	Goodwill	144,992
	Identified intangible assets	42,300
	Accrued and other liabilities, net	(6,950		)
	Long-term deferred tax liability, net	(9,625		)
	Total	$	177,647
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	'
	The following table presents details of the identified intangible assets acquired (in thousands, except years):
		Fair Value			Estimated Useful Life
	Developed technology	$	34,500		7 years
	In-process research and development	7,600			N/A
	Other	200			2 years
	Total	$	42,300
Business Acquisition, Pro Forma Information	'
	The following table presents the unaudited pro forma financial information for the three and nine months ended April 30, 2014 and 2013, as though the companies were combined as of August 1, 2012 (in thousands):
		Three Months Ended April 30,						Nine Months Ended April 30,
		2014			2013			2014			2013
	Total revenue	$	150,732		$	101,295		$	420,023		$	283,739
	Net loss	$	(149,776	)	$	(10,744	)	$	(210,276	)	$	(23,502	)
Morta Security, Inc.	'
Business Acquisition [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes our preliminary allocation of the purchase consideration based on the fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Goodwill	$	10,094
	Identified intangible assets	2,200
	Net liabilities assumed	(1,949		)
	Total	$	10,345
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	'
	The following table presents details of the identified intangible assets acquired (in thousands, except years):
		Fair Value			Estimated Useful Life
	In-process research and development held for defensive purposes	$	1,900		3 years
	Other	300			2 years
	Total	$	2,200

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Apr. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	The following table presents details of our goodwill during the nine months ended April 30, 2014 (in thousands):
		Gross Carrying Amount		Accumulated Impairment Loss			Net Carrying Amount
	Balance as of July 31, 2013	$	—	$	—		$	—
	Goodwill acquired	155,086		—			155,086
	Balance as of April 30, 2014	$	155,086	$	—		$	155,086
Finite-Lived Intangible Assets and Related Amortization	'
	The following tables present details of our purchased intangible assets as of April 30, 2014 and July 31, 2013 (in thousands):
		30-Apr-14
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Intangible assets with finite lives:
	Developed technology	$	34,500	$	(411	)	$	34,089
	Acquired intellectual property	6,546		(753		)	5,793
	In-process research and development held for defensive purposes	1,900		(212		)	1,688
	Other	500		(57		)	443
	Total intangible assets with finite lives	43,446		(1,433		)	42,013
	In-process research and development with indefinite lives	7,600		—			7,600
	Total purchased intangible assets	$	51,046	$	(1,433	)	$	49,613
		31-Jul-13
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Acquired intellectual property	$	1,546	$	(188	)	$	1,358
Finite-Lived Intangible Assets, Future Amortization Expense	'
	The following table summarizes our estimated future amortization expense of intangible assets with finite lives by type as of April 30, 2014 (in thousands):
		Fiscal Years Ending July 31,
		Remaining 2014		2015			2016		2017		2018		2019 and Thereafter
	Developed technology	$	1,232	$	4,928		$	4,928	$	4,928	$	4,928	$	13,145
	Acquired intellectual property	205		761			704		611		484		3,028
	In-process research and development held for defensive purposes	158		633			633		264		—		—
	Other	63		250			130		—		—		—
	Total future amortization expense	$	1,658	$	6,572		$	6,395	$	5,803	$	5,412	$	16,173

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Apr. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases	'
	The following table presents details of the aggregate future non-cancelable minimum rental payments on our operating leases as of April 30, 2014 (in thousands):
		Amount
	Fiscal years ending July 31:
	Remaining 2014	$	2,930
	2015	13,778
	2016	14,018
	2017	13,052
	2018	11,774
	2019 and thereafter	52,300
	Committed gross lease payments	107,852
	Less: proceeds from sublease rental	10,700
	Net operating lease obligation	$	97,152

Equity_Award_Plans_Tables

Equity Award Plans (Tables)	9 Months Ended
	Apr. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Stock Options Activity	'
	A summary of the activity under our stock plans and changes during the reporting period and a summary of information related to options exercisable, vested, and expected to vest are presented below (in thousands, except per share amounts):
		Options Outstanding
		Number			Weighted-				Weighted-		Aggregate
		of			Average				Average		Intrinsic
		Shares			Exercise				Remaining		Value
					Price				Contractual
									Term
									(Years)
	Balance—July 31, 2013	10,033			$	11.74			7.8		$	373,228
	Options granted	—			—
	Options forfeited	(488	)		15.17
	Options exercised	(2,949	)		8.62
	Balance—April 30, 2014	6,596			12.88				7.3		$	334,417
	Options vested and expected to vest—April 30, 2014	6,410			$	12.77			7.3		$	325,692
	Options exercisable—April 30, 2014	3,668			$	10.25			7		$	195,614
Schedule of Restricted Stock Units Award Activity	'
	A summary of the activity under our stock plans and changes during the reporting period and a summary of information related to RSUs vested and expected to vest are presented below (in thousands, except per share amounts):
		RSUs Outstanding
		Number			Weighted-				Weighted-		Aggregate
		of			Average				Average		Intrinsic
		Shares			Grant-Date Fair Value Per Share				Remaining		Value
									Contractual
									Term
									(Years)
	Balance—July 31, 2013	2,241			$	54.36			1.5		$	109,675
	RSUs granted	4,073			56.77
	RSUs vested	(646	)		55.95
	RSUs forfeited	(358	)		55.29
	Balance—April 30, 2014	5,310			$	55.95			1.5		$	337,610
	RSUs vested and expected to vest—April 30, 2014	4,782			$	55.89			1.4		$	304,040
Shares Available For Grant	'
	The following table presents the stock activity and the total number of shares available for grant as of April 30, 2014 (in thousands):
		Number of Shares
	Balance—July 31, 2013	8,932
	Authorized	3,223
	RSUs granted	(4,073	)
	Repurchased	27
	Options forfeited	488
	RSUs forfeited	358
	Balance—April 30, 2014	8,955
Summary of Employee Stock Purchase Plan, Valuation Assumptions	'
	The following table summarizes the assumptions used to value grants related to the 2012 ESPP in each period:
		Three Months Ended April 30,				Nine Months Ended April 30,
		2014		2013		2014		2013
	Risk-free interest rate	0.10%		0.10%		0.10%		0.10%
	Expected term (years)	<1 year		<1 year		<1 year		<1 year
	Volatility	41%		41%		40%		41%
	Dividend yield	—%		—%		—%		—%
Schedule of Allocation of Share Based Compensation Expense	'
	The following table summarizes share-based compensation included in costs and expenses (in thousands):
		Three Months Ended April 30,								Nine Months Ended April 30,
		2014				2013				2014			2013
	Cost of revenue	$	3,156			$	1,364			$	7,311		$	2,799
	Research and development	8,666				3,024				17,825			6,687
	Sales and marketing	12,372				5,686				29,050			13,919
	General and administrative	3,798				2,560				12,601			6,325
	Total	$	27,992			$	12,634			$	66,787		$	29,730

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Apr. 30, 2014
Earnings Per Share [Abstract]	'
Computation of basic and diluted net income (loss) per share of common stock	'
	The following table presents the computation of basic and diluted net loss per share of common stock (in thousands, except per share data):
		Three Months Ended							Nine Months Ended
		April 30,							April 30,
		2014				2013			2014			2013
	Net loss	$	(146,587	)		$	(7,282	)	$	(194,394	)	$	(13,410	)
	Weighted-average shares used to compute net loss per share, basic and diluted	74,967				69,575			73,127			67,980
	Net loss per share, basic and diluted	$	(1.96	)		$	(0.10	)	$	(2.66	)	$	(0.20	)
Schedule of antidilutive securities excluded from computation of net income (loss) per share	'
	The following outstanding options, RSUs, and ESPP shares were excluded from the computation of diluted net loss per common share for the periods presented as their effects would have been antidilutive (in thousands):
		30-Apr-14			30-Apr-13
	Options to purchase common stock	6,596			10,637
	RSUs	5,310			1,798
	ESPP shares	41			—

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Apr. 30, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	$4,000	$180,367
Short-term investments	133,180	109,007
Long-term investments	103,902	17,314
Other assets	1,220	1,221
Total assets measured at fair value	242,302	307,909
Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	133,667
Short-term investments	0	0
Long-term investments	0	0
Other assets	1,220	1,221
Total assets measured at fair value	1,220	134,888
Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	4,000	46,700
Short-term investments	133,180	109,007
Long-term investments	103,902	17,314
Other assets	0	0
Total assets measured at fair value	241,082	173,021
Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Short-term investments	0	0
Long-term investments	0	0
Other assets	0	0
Total assets measured at fair value	0	0
Certificates of deposit	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	1,822
Long-term investments	3,001	0
Other assets	1,220	1,221
Certificates of deposit | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	1,822
Long-term investments	0	0
Other assets	1,220	1,221
Certificates of deposit | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Long-term investments	3,001	0
Other assets	0	0
Certificates of deposit | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Long-term investments	0	0
Other assets	0	0
U.S. government and agency securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	4,000	46,700
Short-term investments	105,597	76,173
Long-term investments	82,511	4,997
U.S. government and agency securities | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Short-term investments	0	0
Long-term investments	0	0
U.S. government and agency securities | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	4,000	46,700
Short-term investments	105,597	76,173
Long-term investments	82,511	4,997
U.S. government and agency securities | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Short-term investments	0	0
Long-term investments	0	0
Money market funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	131,845
Money market funds | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	131,845
Money market funds | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Money market funds | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Corporate debt securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	27,583	32,834
Long-term investments	18,390	12,317
Corporate debt securities | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	0	0
Long-term investments	0	0
Corporate debt securities | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	27,583	32,834
Long-term investments	18,390	12,317
Corporate debt securities | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	0	0
Long-term investments	$0	$0

Investments_AvailableforSale_I

Investments (Available-for-Sale Investments) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Jul. 31, 2013
Schedule of Available-for-sale Securities	'	'
Amortized Cost	$241,021	$306,704
Available-for-sale Securities, Gross Unrealized Gain	91	20
Unrealized Losses	-30	-36
Total	241,082	306,688
Certificates of deposit	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	3,000	1,822
Available-for-sale Securities, Gross Unrealized Gain	1	0
Unrealized Losses	0	0
Total	3,001	1,822
Corporate debt securities	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	45,957	45,173
Available-for-sale Securities, Gross Unrealized Gain	22	12
Unrealized Losses	-6	-34
Total	45,973	45,151
U.S. government and agency securities	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	192,064	127,864
Available-for-sale Securities, Gross Unrealized Gain	68	8
Unrealized Losses	-24	-2
Total	192,108	127,870
Money market funds	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	'	131,845
Available-for-sale Securities, Gross Unrealized Gain	'	0
Unrealized Losses	'	0
Total	'	$131,845

Investments_AvailableforSale_I1

Investments (Available-for-Sale Investments in Unrealized Loss Position) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Jul. 31, 2013
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	$50,367	$47,355
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	50,367	47,355
Less than 12 Months, Unrealized Loss	-30	-36
12 Months or Greater, Unrealized Loss	0	0
Total, Unrealized Loss	-30	-36
Corporate debt securities	'	'
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	16,766	31,429
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	16,766	31,429
Less than 12 Months, Unrealized Loss	-6	-34
12 Months or Greater, Unrealized Loss	0	0
Total, Unrealized Loss	-6	-34
U.S. government and agency securities	'	'
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	33,601	15,926
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	33,601	15,926
Less than 12 Months, Unrealized Loss	-24	-2
12 Months or Greater, Unrealized Loss	0	0
Total, Unrealized Loss	($24)	($2)

Investments_AvailableforSale_I2

Investments (Available-for-Sale Investments, Contractual Maturities) (Details) (USD $)	Apr. 30, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost	'	'
Due within one year	$137,154	'
Due within one to two years	103,867	'
Total	241,021	'
Fair Value	'	'
Due within one year	137,180	'
Due within one to two years	103,902	'
Total	$241,082	$306,688

Acquisitions_Details

Acquisitions (Details) (USD $)	9 Months Ended	0 Months Ended		0 Months Ended	3 Months Ended
Share data in Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 09, 2014	Apr. 30, 2014	Dec. 26, 2013	Oct. 31, 2013
		Cyvera, Ltd.	Cyvera, Ltd.	Morta Security, Inc.	Acquired intellectual property
Business Acquisition [Line Items]	'	'	'	'	'
Cash	'	$90,170,000	'	$10,345,000	'
Equity	'	87,477,000	'	'	'
Business Combination, Consideration Transferred	'	177,647,000	'	'	'
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	'	1,281	'	'	'
Restricted stock unit to be issued to replace Cyvera's unvested options, fair value	'	6,353,000	'	'	'
Restricted stock issued during period, share-based compensation, shares	'	276	'	'	'
Restricted stock issued during period, share-based compensation, value	'	17,612,000	'	'	'
Period of release of restriction on restricted common stock	'3 years	'3 years	'	'	'
Acquisition Cost	'	'	3,583,000	'	'
Restricted cash for Morta's indemnification obligations	'	'	'	2,500,000	'
Finite-lived Intangible Assets Acquired	'	'	'	$2,200,000	$5,000,000
Estimated Weighted Average Useful Life (in years)	'	'	'	'	'13 years

Acquisitions_Purchase_price_al

Acquisitions Purchase price allocation (Details) (USD $)	Apr. 30, 2014	Jul. 31, 2013	Dec. 26, 2013	Apr. 09, 2014
In Thousands, unless otherwise specified			Morta Security, Inc.	Cyvera, Ltd.
Business Acquisition [Line Items]	'	'	'	'
Cash	'	'	'	$6,930
Goodwill	155,086	0	10,094	144,992
Identified intangible assets	'	'	2,200	'
Identified intangible assets	'	'	'	42,300
Accrued and other liabilities, net	'	'	-1,949	-6,950
Long-term deferred tax liability, net	'	'	'	-9,625
Total	'	'	$10,345	$177,647

Acquisitions_Schedule_of_finit

Acquisitions Schedule of finite-lived intangible assets acquired as part of business combination (Details) (USD $)	0 Months Ended
	Dec. 26, 2013	Dec. 26, 2013	Dec. 26, 2013	Apr. 09, 2014	Apr. 09, 2014	Apr. 09, 2014	Apr. 09, 2014
	Morta Security, Inc.	Morta Security, Inc.	Morta Security, Inc.	Cyvera, Ltd.	Cyvera, Ltd.	Cyvera, Ltd.	Cyvera, Ltd.
		In-process research and development	Other		Developed Technology	In-process research and development	Other
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'	'
Finite-lived Intangible Assets Acquired	$2,200,000	$1,900,000	$300,000	'	$34,500,000	'	$200,000
Estimated Weighted Average Useful Life (in years)	'	'3 years	'2 years	'	'7 years	'	'2 years
Indefinite-lived Intangible Assets Acquired	'	'	'	'	'	7,600,000	'
Intangible Assets Acquired	'	'	'	$42,300,000	'	'	'

Acquisitions_Pro_Forma_Informa

Acquisitions Pro Forma Information (Details) (Cyvera, Ltd., USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Cyvera, Ltd.	'	'	'	'
Business Combination, Separately Recognized Transactions [Line Items]	'	'	'	'
Total Revenue	$150,732	$101,295	$420,023	$283,739
Net loss	($149,776)	($10,744)	($210,276)	($23,502)

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets Goodwill roll-forward (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014
Goodwill [Line Items]	'
Gross carrying amount, beginning	$0
Goodwill acquired	155,086
Gross carrying amount, ending	155,086
Goodwill, accumulated impairment loss, beginning	0
Goodwill, Impairment Loss	0
Goodwill, accumulated impairment loss, ending	0
Goodwill, beginning	0
Goodwill, net, increase (decrease)	155,086
Goodwill, ending	$155,086

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Details) (USD $)	Apr. 30, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$43,446	'
Accumulated Amortization	-1,433	'
Net Carrying Amount	42,013	'
Intangible Assets, Gross (Excluding Goodwill)	51,046	'
Intangible assets, net	49,613	1,358
Developed Technology	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	34,500	'
Accumulated Amortization	-411	'
Net Carrying Amount	34,089	'
Acquired intellectual property	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	6,546	1,546
Accumulated Amortization	-753	-188
Net Carrying Amount	5,793	1,358
In-process research and development	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	1,900	'
Accumulated Amortization	-212	'
Net Carrying Amount	1,688	'
Other	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	500	'
Accumulated Amortization	-57	'
Net Carrying Amount	443	'
In-process research and development	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$7,600	'

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets Amortization expense (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Amortization of Intangible Assets	$820	$42	$1,245	$68

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets Future Amortization Expense (Details) (USD $)	Apr. 30, 2014
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'
Remaining 2014	$1,658
2015	6,572
2016	6,395
2017	5,803
2018	5,412
2019 and thereafter	16,173
Developed Technology	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Remaining 2014	1,232
2015	4,928
2016	4,928
2017	4,928
2018	4,928
2019 and thereafter	13,145
Acquired intellectual property	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Remaining 2014	205
2015	761
2016	704
2017	611
2018	484
2019 and thereafter	3,028
In-process research and development	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Remaining 2014	158
2015	633
2016	633
2017	264
2018	0
2019 and thereafter	0
Other	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Remaining 2014	63
2015	250
2016	130
2017	0
2018	0
2019 and thereafter	$0

Commitments_and_Contingencies_1

Commitments and Contingencies Lease commitment schedule (Details) (USD $)	Apr. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Remaining 2014	$2,930
2015	13,778
2016	14,018
2017	13,052
2018	11,774
2019 and thereafter	52,300
Committed gross lease payments	107,852
Less: proceeds from sublease rental	10,700
Net operating lease obligation	$97,152

Commitments_and_Contingencies_2

Commitments and Contingencies (Textuals) (Details) (USD $)	Apr. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Contract Manufacturer Commitments	$29,407

Mutual_Covenant_Not_to_Sue_and1

Mutual Covenant Not to Sue and Release Agreement (Details) (USD $)	0 Months Ended	3 Months Ended
	Jan. 27, 2014	Jan. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'	'
Payment related to Mutual Covenant Not to Sue and Release agreement	$20,000,000	'
Legal settlement expense related to Mutual Covenant Not to Sue and Release agreement	'	$20,000,000

Equity_Award_Plans_Stock_Optio

Equity Award Plans (Stock Options Activity) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2014	Jul. 31, 2013
Options, Outstanding Roll Forward	'	'
Balance, beginning (in shares)	10,033	'
Options granted (in shares)	0	'
Options forfeited (in shares)	-488	'
Options exercised (in shares)	-2,949	'
Balance, ending (in shares)	6,596	10,033
Options, Outstanding, Weighted Average Exercise Price Roll Forward	'	'
Balance, beginning (in usd per share)	$11.74	'
Options granted (in usd per share)	$0	'
Options forfeited (in usd per share)	$15.17	'
Options exercised (in usd per share)	$8.62	'
Balance, ending (in usd per share)	$12.88	$11.74
Options, Additional Disclosures	'	'
Weighted-Average Remaining Contractual Life (in years)	'7 years 3 months	'7 years 9 months
Aggregate Intrinsic Value	$334,417	$373,228
Options vested and expected to vest (in shares)	6,410	'
Options vested and expected to vest, Weighted-Average Exercise Price (in usd per share)	$12.77	'
Options vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	'7 years 3 months	'
Options vested and expected to vest, Aggregate Intrinsic Value	325,692	'
Options exercisable (in shares)	3,668	'
Options exercisable, Weighted-Average Exercise Price (in usd per share)	$10.25	'
Options exercisable, Weighted-Average Remaining Contractual Term (in years)	'7 years 0 months	'
Optios exercisable, Aggregate Intrinsic Value	$195,614	'

Equity_Award_Plans_Restricted_

Equity Award Plans (Restricted Stock Units Award Activity) (Details) (Restricted Stock Units (RSUs), USD $)	9 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2014	Jul. 31, 2013
Restricted Stock Units (RSUs)	'	'
RSUs, Outstanding Roll Forward	'	'
Balance, beginning (in shares)	2,241	'
RSUs granted (in shares)	4,073	'
RSUs vested (in shares)	-646	'
RSUs forfeited (in shares)	-358	'
Balance, ending (in shares)	5,310	2,241
RSUs, Outstanding, Weighted Average Grant-Date Fair Value Per Share Roll Forward	'	'
Balance, beginning (in usd per share)	$54.36	'
RSUs granted (in usd per share)	$56.77	'
RSUs vested (in usd per share)	$55.95	'
RSUs forfeited (in usd per share)	$55.29	'
Balance, ending (in usd per share)	$55.95	$54.36
RSUs, Additional Disclosures	'	'
Weighted-Average Remaining Contractual Term (in years)	'1 year 6 months	'1 year 6 months
Aggregate Intrinsic Value	$337,610	$109,675
RSUs vested and expected to vest (in shares)	4,782	'
RSUs vested and expected to vest, Weighted-Average Grant-Date Fair Value (in usd per share)	$55.89	'
RSUs vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	'1 year 5 months	'
RSUs vested and expected to vest, Aggregate Intrinsic Value	$304,040	'

Equity_Award_Plans_Shares_Avai

Equity Award Plans Shares Available for Grant (Details)	9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award	'
Shares Available for Grant, Beginning (in shares)	8,932
Additional Shares Authorized (in shares)	3,223
Stock Repurchased (in shares)	27
Options forfeited (in shares)	488
Shares Available for Grant, Ending (in shares)	8,955
Restricted Stock Units (RSUs)	'
Share-based Compensation Arrangement by Share-based Payment Award	'
RSUs granted (in shares)	-4,073
RSUs forfeited (in shares)	358

Equity_Award_Plans_Employee_St

Equity Award Plans Employee Stock Purchase Plan, Valuation Assumptions (Details) (Employee Stock Purchase Plan (ESPP))	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Employee Stock Purchase Plan (ESPP)	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award	'	'	'	'
Risk-free interest rate	0.10%	0.10%	0.10%	0.10%
Expected term (in years)	'6 months	'6 months	'6 months	'6 months
Volatility	41.00%	41.00%	40.00%	41.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%

Equity_Award_Plans_Allocation_

Equity Award Plans (Allocation of Share Based Compensation Expense) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'	'
Allocated Share-based Compensation Expense	$27,992	$12,634	$66,787	$29,730
Cost of revenue	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'	'
Allocated Share-based Compensation Expense	3,156	1,364	7,311	2,799
Research and development	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'	'
Allocated Share-based Compensation Expense	8,666	3,024	17,825	6,687
Sales and marketing	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'	'
Allocated Share-based Compensation Expense	12,372	5,686	29,050	13,919
General and administrative	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'	'
Allocated Share-based Compensation Expense	$3,798	$2,560	$12,601	$6,325

Equity_Award_Plans_Allocation_1

Equity Award Plans Allocation of Share-based Compensation 2 (Details) (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award	'	'	'	'
Allocated Share-based Compensation Expense	$27,992,000	$12,634,000	$66,787,000	$29,730,000
Total compensation cost not yet recognized, nonvested awards, net of estimated forfeitures	282,866,000	'	282,866,000	'
Period for Recognition of Total Compensation Cost Not yet Recognized (in years)	'	'	'3 years	'
Plan Modification, Incremental Compensation Cost	62,000	0	3,446,000	1,861,000
Employee Stock Purchase Plan (ESPP)	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award	'	'	'	'
Allocated Share-based Compensation Expense	$1,142,000	$1,132,000	$3,217,000	$3,943,000

Income_Taxes_Details

Income Taxes (Details)	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Effective income tax rate	-1.00%	-12.00%	-3.00%	-14.00%

Net_Income_Loss_Per_Share_Comp

Net Income (Loss) Per Share (Computation of Basic and Diluted Net Income (Loss) Per Share) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Net loss	($146,587)	($7,282)	($194,394)	($13,410)
Weighted-average shares used to compute net loss per share, basic and diluted	74,967	69,575	73,127	67,980
Net loss per share, basic and diluted	($1.96)	($0.10)	($2.66)	($0.20)

Net_Income_Loss_Per_Share_Sche

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details)	9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Options to purchase common stock	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Antidilutive securities (in shares)	6,596	10,637
RSUs	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Antidilutive securities (in shares)	5,310	1,798
ESPP shares	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Antidilutive securities (in shares)	41	0

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Related Party Transactions [Abstract]	'	'	'	'
Revenue from Related Parties	$1,619	$903	$3,776	$2,381

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	27-May-14
					Subsequent Event
Subsequent Event	'	'	'	'	'
Subsequent Event, Date	'	'	'	'	27-May-14
Legal settlement, total amount, per agreement	'	'	'	'	$175,000,000
Legal settlement, total amount	'	'	'	'	182,473,000
Legal settlement in cash, amount	'	'	'	'	75,000,000
Legal settlement in common stock, number of shares	'	'	'	'	1,081
Legal settlement in common stock, amount, per agreement	'	'	'	'	70,000,000
Legal settlement in warrants, number of shares	'	'	'	'	463
Legal settlement in warrants, amount, per agreement	'	'	'	'	30,000,000
Period of mutual covenant-not-to-sue for patent infringement	'	'	'	'	'8 years
Finite-lived intangible asset related to licensing of intellectual property to be recorded in fiscal forth quarter of 2014	'	'	'	'	61,300,000
Settlement amount allocated to the mutual dismissal of claims	'	'	'	'	54,300,000
Settlement amount allocated to the mutual covenant not-to-sue	'	'	'	'	66,873,000
Legal Settlement	$121,173,000	$0	$141,173,000	$0	'
Legal settlement in warrants, exercise price (in usd per share)	'	'	'	'	$0.00