Palo Alto Networks (PANW) 10-Q 5 Dec 13 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	3 Months Ended
	Oct. 31, 2013	Nov. 15, 2013
Document Information [Abstract]	'	'
Entity Registrant Name	'Palo Alto Networks Inc	'
Entity Central Index Key	'0001327567	'
Document Type	'10-Q	'
Document Period End Date	31-Oct-13	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Document Fiscal Year End Date	'--07-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	72,491,140

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$266,182	$310,614
Short-term investments	170,551	109,007
Accounts receivable, net of allowance for doubtful accounts of $486 and $51 at October 31, 2013 and July 31, 2013, respectively	91,439	87,461
Prepaid expenses and other current assets	24,160	22,617
Total current assets	552,332	529,699
Property and equipment, net	42,409	32,086
Long-term investments	33,642	17,314
Other assets	11,560	6,507
Total assets	639,943	585,606
Current liabilities:	'	'
Accounts payable	15,218	15,544
Accrued and other liabilities	17,876	14,609
Accrued compensation	23,618	22,004
Deferred revenue	171,617	153,945
Total current liabilities	228,329	206,102
Deferred revenue—non-current	107,339	95,285
Other long-term liabilities	14,496	11,799
Commitments and contingencies (Note 5)	'	'
Stockholders' equity:	'	'
Preferred stock; $0.0001 par value; 100,000 shares authorized; none issued and outstanding at October 31, 2013 and July 31, 2013	0	0
Common stock, $0.0001 par value; 1,000,000 shares authorized; 72,483 and 71,612 shares issued and outstanding at October 31, 2013 and July 31, 2013, respectively	7	7
Additional paid-in capital	406,902	381,703
Accumulated other comprehensive income (loss)	5	-16
Accumulated deficit	-117,135	-109,274
Total stockholders’ equity	289,779	272,420
Total liabilities and stockholders’ equity	$639,943	$585,606

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, except Share data, unless otherwise specified
Current assets:	'	'
Allowance for doubtful accounts (in usd)	$486	$51
Stockholders' equity:	'	'
Preferred stock, par value (in usd per share)	$0.00	$0.00
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in usd per share)	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued	72,483,000	71,612,000
Common Stock, Shares, Outstanding	72,483,000	71,612,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Revenue:	'	'
Product	$75,485	$55,514
Services	52,695	30,420
Total revenue	128,180	85,934
Cost of revenue:	'	'
Product	17,954	14,416
Services	15,853	9,774
Total cost of revenue	33,807	24,190
Total gross profit	94,373	61,744
Operating expenses:	'	'
Research and development	19,893	13,312
Sales and marketing	67,366	42,607
General and administrative	14,125	8,956
Total operating expenses	101,384	64,875
Operating loss	-7,011	-3,131
Interest income	160	98
Other income (expense), net	237	-170
Loss before income taxes	-6,614	-3,203
Provision for income taxes	1,247	312
Net loss	-7,861	-3,515
Net loss attributable to common stockholders	($7,861)	($3,515)
Net loss per share attributable to common stockholders, basic and diluted (in usd per share)	($0.11)	($0.05)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)	71,681	66,813

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Net loss	($7,861)	($3,515)
Other comprehensive loss, net of tax:	'	'
Change in unrealized gains (loss) on investments	21	-27
Comprehensive loss	($7,840)	($3,542)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Cash flows from operating activities	'	'
Net loss	($7,861)	($3,515)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	3,146	2,053
Amortization of investment premiums, net of accretion of purchase discounts	386	316
Share-based compensation for equity based awards	14,383	8,284
Excess tax benefit from share-based compensation	-56	0
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-3,978	-10,727
Prepaid expenses and other assets	-1,707	-3,830
Accounts payable	-205	1,076
Accrued and other liabilities	5,047	4,819
Deferred revenue	29,726	24,600
Net cash provided by operating activities	38,881	23,076
Cash flows from investing activities	'	'
Purchase of property, equipment, and other assets	-15,680	-4,015
Purchase of investments	-122,238	-168,475
Proceeds from maturities of investments	43,959	0
Net cash used in investing activities	-93,959	-172,490
Cash flows from financing activities	'	'
Excess tax benefit from share-based compensation	56	0
Proceeds from exercise of stock options	4,610	1,534
Proceeds from employee stock purchase plan	5,988	0
Payments of initial public offering costs	0	-265
Repurchase of restricted common stock from terminated employees	-8	-24
Net cash provided by financing activities	10,646	1,245
Net decrease in cash and cash equivalents	-44,432	-148,169
Cash and cash equivalents—beginning of period	310,614	322,642
Cash and cash equivalents—end of period	266,182	174,473
Non-cash investing and financing activities	'	'
Purchase of property, equipment, and other assets not yet paid	$3,556	$0

Description_of_Business_and_Su

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Oct. 31, 2013
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 network security platform that allows enterprises, service providers, and government entities to secure their networks and safely enable the increasingly complex and rapidly growing number of applications running on their networks. The core of our platform is our Next-Generation Firewall that delivers application, user, and content visibility and control integrated within the firewall through our proprietary operating system, hardware, and software architecture. 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 the 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.
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of the Company, and its 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 compared to those described in our Annual Report on Form 10-K for the fiscal year ended July 31, 2013.
	Warranties
	We generally provide a one-year warranty on hardware and a three-month warranty on software. We are indemnified by our contract manufacturer for product liability claims arising out of manufacturing defects. We accrue for potential warranty claims as a component of cost of product revenues based on historical experience and other data. Accrued warranty is recorded in accrued liabilities on the condensed consolidated balance sheets and is reviewed periodically for adequacy. To date, we have not accrued any significant costs associated with our warranty.
	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. 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	3 Months Ended
	Oct. 31, 2013
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):
			October 31, 2013								July 31, 2013
			Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Certificates of deposit		$	1,926	$	—	$	—	$	1,926	$	1,822	$	—	$	—	$	1,822
	U.S. government and agency securities		—		80,062		—		80,062		—		46,700		—		46,700
	Money market funds		—		—		—		—		131,845		—		—		131,845
	Total cash equivalents		1,926		80,062		—		81,988		133,667		46,700		—		180,367
	Short-term investments:
	Corporate debt securities		—		27,292		—		27,292		—		32,834		—		32,834
	U.S. government and agency securities		—		143,259		—		143,259		—		76,173		—		76,173
	Total short-term investments		—		170,551		—		170,551		—		109,007		—		109,007
	Long-term investments:
	Corporate debt securities		—		6,097		—		6,097		—		12,317		—		12,317
	U.S. government and agency securities		—		27,545		—		27,545		—		4,997		—		4,997
	Total long-term investments		—		33,642		—		33,642		—		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		$	3,146	$	284,255	$	—	$	287,401	$	134,888	$	173,021	$	—	$	307,909

Investments

Investments	3 Months Ended
	Oct. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	Investments
	The following tables summarize our unrealized gains and losses and fair value of investments as of October 31, 2013 and July 31, 2013 (in thousands):
		31-Oct-13
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	1,926	$	—		$	—		$	1,926
	Corporate debt securities	33,367		25			(3		)	33,389
	U.S. government and agency securities	250,883		7			(24		)	250,866
	Total	$	286,176	$	32		$	(27	)	$	286,181
		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 October 31, 2013 and July 31, 2013 (in thousands):
		31-Oct-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	$	4,557	$	(2	)	$	2,060		$	(1	)	$	6,617	$	(3	)
	U.S. government and agency securities	162,279		(24		)	—			—			162,279		(24		)
	Total	$	166,836	$	(26	)	$	2,060		$	(1	)	$	168,896	$	(27	)
		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 October 31, 2013.
	The amortized cost and fair value of our investments at October 31, 2013, by contractual years-to-maturity, are as follows (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	263,528	$	263,542
	Due within one to two years	22,648		22,639
	Total	$	286,176	$	286,181

Intangible_Assets

Intangible Assets	3 Months Ended
	Oct. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets Disclosure	'
	Intangible Assets
	Intangible assets included in other assets consisted of the following (in thousands):
		31-Oct-13			31-Jul-13
	Acquired intellectual property	$	6,546		$	1,546
	Less: amortization	(343		)	(188		)
	Total	$	6,203		$	1,358
	Amortization expense was $155,000 and $13,000 for the first quarter of fiscal 2014 and 2013, respectively. On September 4, 2013 we entered into an agreement to purchase intellectual property for $5,000,000, which will be amortized over a weighted average period of 13 years.
	The following table summarizes estimated future amortization expense of intangible assets as of October 31, 2013 (in thousands):
		Amount
	Years ending July 31:
	Remaining 2014	$	615
	2015	761
	2016	704
	2017	611
	2018	484
	2019 and thereafter	3,028
	Total	$	6,203

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Oct. 31, 2013
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 aggregate future non-cancelable minimum rental payments on our operating leases, as of October 31, 2013, are as follows (in thousands):
		Amount
	Years ending July 31:
	Remaining 2014	$	7,038
	2015	13,416
	2016	13,563
	2017	12,591
	2018	11,427
	2019 and thereafter	52,300
	Committed gross lease payments	110,335
	Less: proceeds from sublease rental	(10,700		)
	Net operating lease obligation	$	99,635
	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 October 31, 2013, we had $25,300,000 of open orders.
	Litigation
	In December 2011, Juniper Networks, Inc. filed a complaint against us in the United States District Court for the District of Delaware alleging patent infringement. The complaint seeks preliminary and permanent injunctions against infringement, treble damages, and attorney’s fees. On February 9, 2012, we filed a response to the complaint, which denied all claims and asserted that the claimant’s patents were invalid. On February 28, 2012, Juniper filed a motion to strike our defense of invalidity based on the legal doctrine of “assignor estoppel.” On March 23, 2012, we filed a brief in opposition to that motion. Juniper filed a brief in response on April 2, 2012. On August 2, 2012, the District Court issued an order granting Juniper’s motion as to one of the patents in suit (the ’634 patent) but denying Juniper’s motion as to the five other patents in suit. 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. Juniper now alleges that our appliances infringe seven of its patents. 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. We did not file a request for reexamination on the withdrawn patent. 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. 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. We have the opportunity to seek review of these denials within the U.S. Patent and Trademark Office. Each party served its opening expert report on April 12, 2013, and rebuttal expert report on May 13, 2013, and supplemental expert reports on June 11, 2013. The parties filed opening and responsive briefs regarding claim construction, filed their opening summary judgment briefs on August 20, 2013, and filed opposition briefs and additional summary judgment motions on September 12, 2013. 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. The Patent and Trademark Office has not yet ruled on those petitions. A hearing to resolve claim construction issues, as well as motions for summary judgment, was heard on November 15, 2013.
	A trial date has been scheduled for February 24, 2014, and we are vigorously defending ourselves from such claims. At this stage in the litigation we do not believe that a loss is probable and we are unable to estimate a possible loss or range of possible loss.
	On September 30, 2013, we filed a lawsuit against Juniper in the United States District Court for the Northern District of California. The lawsuit alleges that Juniper’s products infringe three of our U.S. patents, and seeks monetary damages and a permanent injunction. On November 21, 2013, Juniper filed an answer and counterclaims in a separate action pending in the United States District Court for the Northern District of California. In its counterclaims Juniper seeks a declaration that the asserted patents owned by us are not infringed and are invalid. Juniper’s counterclaims also assert that our products infringe three additional Juniper patents. We have not yet responded to Juniper’s counterclaims.
	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.

Equity_Award_Plans

Equity Award Plans	3 Months Ended
	Oct. 31, 2013
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 periods 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	(154	)		10.82
	Options exercised	(676	)		6.82
	Balance—October 31, 2013	9,203			12.12			7.6	$	276,458
	Options vested and expected to vest—October 31, 2013	8,859			$	11.96		7.6	$	267,542
	Options exercisable—October 31, 2013	4,950			$	8.79		7.3	$	165,182
	Restricted Stock Units (RSUs) Activities
	A summary of the activity under our stock plans and changes during the reporting periods 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	459			46.03
	RSUs vested	(52	)		64.35
	RSUs forfeited	(83	)		55.2
	Balance—October 31, 2013	2,565			$	52.63		1.5	$	108,140
	RSUs vested and expected to vest—October 31, 2013	2,315			$	52.74		1.4	$	97,600
	Employee Stock Purchase Plan (ESPP)
	During the three months ended October 31, 2013 and 2012, compensation expense recognized in connection with the 2012 Employee Stock Purchase Plan was $1,002,000 and $1,344,000, 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 October 31,
		2013		2012
	Risk-free interest rate	—%		N/A
	Expected term (years)	< 1 year		N/A
	Volatility	39%		N/A
	Dividend yield	—%		N/A
	Share-based compensation is included in costs and expenses as follows (in thousands):
		Three Months Ended October 31,
		2013				2012
	Cost of revenue	$	1,663			$	610
	Research and development	3,262				1,690
	Sales and marketing	6,628				4,298
	General and administrative	2,858				1,744
	Total	$	14,411			$	8,342
	During the three months ended October 31, 2012, we modified the terms of certain share-based awards and as a result, we recorded compensation expense within sales and marketing expense of $1,400,000.
	At October 31, 2013, total compensation cost related to unvested share-based awards granted to employees under our stock plans but not yet recognized was $137,222,000, 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.

Income_Taxes

Income Taxes	3 Months Ended
	Oct. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Our provision for income taxes for the three months ended October 31, 2013 reflects an effective tax rate of negative 19%, and consists of foreign income, withholding taxes, and limited state income tax due to our net operating loss carryforwards and other tax attributes.
	Our provision for income taxes for the three months ended October 31, 2012 reflected an effective tax rate of negative 10% and consists of foreign income and withholding taxes.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	3 Months Ended
	Oct. 31, 2013
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Share	'
	Net Income (Loss) Per Share
	We compute net income (loss) per share of common stock using the two-class method required for participating securities. We consider shares issued upon the early exercise of options subject to repurchase and unvested restricted shares to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares. In accordance with the two-class method, earnings allocated to these participating securities, which include participation rights in undistributed earnings with common stock, are subtracted from net income to determine net income (loss) attributable to common stockholders.
	Basic net income (loss) per common share is computed by dividing net income (loss) attributable to common stockholders by basic weighted-average shares outstanding during the period. All participating securities are excluded from basic weighted-average shares outstanding. In computing diluted net income (loss) attributable to common stockholders, undistributed earnings are re-allocated to reflect the potential impact of dilutive securities. Diluted net income (loss) per share attributable to common stockholders is computed by dividing net income (loss) attributable to common stockholders by diluted weighted-average shares outstanding, including potentially dilutive securities.
	The following table presents the computation of basic and diluted net income (loss) per share of common stock (in thousands, except per share data):
		Three Months Ended October 31,
		2013				2012
	Net loss attributable to common stockholders	$	(7,861	)		$	(3,515	)
	Weighted-average shares used to compute net loss per share, basic and diluted	71,681				66,813
	Net loss per share attributable to common stockholders, basic and diluted	$	(0.11	)		$	(0.05	)
	The following outstanding options, RSUs, and ESPP shares were excluded from the computation of diluted net income (loss) per common share applicable to common stockholders for the periods presented as their effects would have been antidilutive (in thousands):
		31-Oct-13			31-Oct-12
	Options to purchase common stock	9,203			13,408
	RSUs	2,565			216
	ESPP shares	53			—

Description_of_Business_and_Su1

Description of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Oct. 31, 2013
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 the 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.
Principles of Consolidation	'
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of the Company, and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Warranties	'
	Warranties
	We generally provide a one-year warranty on hardware and a three-month warranty on software. We are indemnified by our contract manufacturer for product liability claims arising out of manufacturing defects. We accrue for potential warranty claims as a component of cost of product revenues based on historical experience and other data. Accrued warranty is recorded in accrued liabilities on the condensed consolidated balance sheets and is reviewed periodically for adequacy. To date, we have not accrued any significant costs associated with our warranty
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. 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)	3 Months Ended
	Oct. 31, 2013
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):
		October 31, 2013								July 31, 2013
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Certificates of deposit	$	1,926	$	—	$	—	$	1,926	$	1,822	$	—	$	—	$	1,822
	U.S. government and agency securities	—		80,062		—		80,062		—		46,700		—		46,700
	Money market funds	—		—		—		—		131,845		—		—		131,845
	Total cash equivalents	1,926		80,062		—		81,988		133,667		46,700		—		180,367
	Short-term investments:
	Corporate debt securities	—		27,292		—		27,292		—		32,834		—		32,834
	U.S. government and agency securities	—		143,259		—		143,259		—		76,173		—		76,173
	Total short-term investments	—		170,551		—		170,551		—		109,007		—		109,007
	Long-term investments:
	Corporate debt securities	—		6,097		—		6,097		—		12,317		—		12,317
	U.S. government and agency securities	—		27,545		—		27,545		—		4,997		—		4,997
	Total long-term investments	—		33,642		—		33,642		—		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	$	3,146	$	284,255	$	—	$	287,401	$	134,888	$	173,021	$	—	$	307,909

Investments_Tables

Investments (Tables)	3 Months Ended
	Oct. 31, 2013
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 October 31, 2013 and July 31, 2013 (in thousands):
		31-Oct-13
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	1,926	$	—		$	—		$	1,926
	Corporate debt securities	33,367		25			(3		)	33,389
	U.S. government and agency securities	250,883		7			(24		)	250,866
	Total	$	286,176	$	32		$	(27	)	$	286,181
		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 October 31, 2013 and July 31, 2013 (in thousands):
		31-Oct-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	$	4,557	$	(2	)	$	2,060		$	(1	)	$	6,617	$	(3	)
	U.S. government and agency securities	162,279		(24		)	—			—			162,279		(24		)
	Total	$	166,836	$	(26	)	$	2,060		$	(1	)	$	168,896	$	(27	)
		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 amortized cost and fair value of our investments at October 31, 2013, by contractual years-to-maturity, are as follows (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	263,528	$	263,542
	Due within one to two years	22,648		22,639
	Total	$	286,176	$	286,181

Intangible_Assets_Tables

Intangible Assets (Tables)	3 Months Ended
	Oct. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Finite-Lived Intangible Assets and Related Amortization	'
	Intangible assets included in other assets consisted of the following (in thousands):
		31-Oct-13			31-Jul-13
	Acquired intellectual property	$	6,546		$	1,546
	Less: amortization	(343		)	(188		)
	Total	$	6,203		$	1,358
Finite-Lived Intangible Assets, Future Amortization Expense	'
	The following table summarizes estimated future amortization expense of intangible assets as of October 31, 2013 (in thousands):
		Amount
	Years ending July 31:
	Remaining 2014	$	615
	2015	761
	2016	704
	2017	611
	2018	484
	2019 and thereafter	3,028
	Total	$	6,203

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Oct. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases	'
	The aggregate future non-cancelable minimum rental payments on our operating leases, as of October 31, 2013, are as follows (in thousands):
		Amount
	Years ending July 31:
	Remaining 2014	$	7,038
	2015	13,416
	2016	13,563
	2017	12,591
	2018	11,427
	2019 and thereafter	52,300
	Committed gross lease payments	110,335
	Less: proceeds from sublease rental	(10,700		)
	Net operating lease obligation	$	99,635

Equity_Award_Plans_Tables

Equity Award Plans (Tables)	3 Months Ended
	Oct. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Stock Options Activity	'
		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	(154	)		10.82
	Options exercised	(676	)		6.82
	Balance—October 31, 2013	9,203			12.12			7.6	$	276,458
	Options vested and expected to vest—October 31, 2013	8,859			$	11.96		7.6	$	267,542
	Options exercisable—October 31, 2013	4,950			$	8.79		7.3	$	165,182
Schedule of Restricted Stock Units Award Activity	'
		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	459			46.03
	RSUs vested	(52	)		64.35
	RSUs forfeited	(83	)		55.2
	Balance—October 31, 2013	2,565			$	52.63		1.5	$	108,140
	RSUs vested and expected to vest—October 31, 2013	2,315			$	52.74		1.4	$	97,600
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 October 31,
		2013		2012
	Risk-free interest rate	—%		N/A
	Expected term (years)	< 1 year		N/A
	Volatility	39%		N/A
	Dividend yield	—%		N/A
Schedule of Allocation of Share Based Compensation Expense	'
	Share-based compensation is included in costs and expenses as follows (in thousands):
		Three Months Ended October 31,
		2013				2012
	Cost of revenue	$	1,663			$	610
	Research and development	3,262				1,690
	Sales and marketing	6,628				4,298
	General and administrative	2,858				1,744
	Total	$	14,411			$	8,342

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Oct. 31, 2013
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 income (loss) per share of common stock (in thousands, except per share data):
		Three Months Ended October 31,
		2013				2012
	Net loss attributable to common stockholders	$	(7,861	)		$	(3,515	)
	Weighted-average shares used to compute net loss per share, basic and diluted	71,681				66,813
	Net loss per share attributable to common stockholders, basic and diluted	$	(0.11	)		$	(0.05	)
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 income (loss) per common share applicable to common stockholders for the periods presented as their effects would have been antidilutive (in thousands):
		31-Oct-13			31-Oct-12
	Options to purchase common stock	9,203			13,408
	RSUs	2,565			216
	ESPP shares	53			—

Description_of_Business_and_Su2

Description of Business and Summary of Significant Accounting Policies (Details)	3 Months Ended
	Oct. 31, 2013
Hardware	'
Description of Business and Summary of Significant Accounting Policies	'
Product warranty term	'1 year
Software	'
Description of Business and Summary of Significant Accounting Policies	'
Product warranty term	'3 months

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	$170,551	$109,007
Long-term investments	33,642	17,314
Other assets	1,220	1,221
Total assets measured at fair value	287,401	307,909
Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	0	0
Long-term investments	0	0
Other assets	1,220	1,221
Total assets measured at fair value	3,146	134,888
Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	170,551	109,007
Long-term investments	33,642	17,314
Other assets	0	0
Total assets measured at fair value	284,255	173,021
Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Short-term investments	0	0
Long-term investments	0	0
Other assets	0	0
Total assets measured at fair value	0	0
Cash equivalents	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	81,988	180,367
Cash equivalents | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	1,926	133,667
Cash equivalents | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	80,062	46,700
Cash equivalents | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	0	0
Certificates of deposit	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	1,926	1,822
Other assets	1,220	1,221
Certificates of deposit | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	1,926	1,822
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
Other assets	0	0
Certificates of deposit | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	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	80,062	46,700
Short-term investments	143,259	76,173
Long-term investments	27,545	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	80,062	46,700
Short-term investments	143,259	76,173
Long-term investments	27,545	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	27,292	32,834
Long-term investments	6,097	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	27,292	32,834
Long-term investments	6,097	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 $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities	'	'
Amortized Cost	$286,176	$306,704
Unrealized Gains	32	20
Unrealized Losses	-27	-36
Estimated Fair Value	286,181	306,688
Certificates of deposit	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	1,926	1,822
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	1,926	1,822
Corporate debt securities	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	33,367	45,173
Unrealized Gains	25	12
Unrealized Losses	-3	-34
Estimated Fair Value	33,389	45,151
U.S. government and agency securities	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	250,883	127,864
Unrealized Gains	7	8
Unrealized Losses	-24	-2
Estimated Fair Value	250,866	127,870
Money market funds	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	'	131,845
Unrealized Gains	'	0
Unrealized Losses	'	0
Estimated Fair Value	'	$131,845

Investments_AvailableforSale_I1

Investments (Available-for-Sale Investments in Unrealized Loss Position) (Details) (USD $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	$166,836	$47,355
12 Months or Greater, Fair Value	2,060	0
Total, Unrealized Loss Position, Fair Value	168,896	47,355
Less than 12 Months, Unrealized Loss	-26	-36
12 Months or Greater, Unrealized Loss	-1	0
Total, Unrealized Loss	-27	-36
Corporate debt securities	'	'
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	4,557	31,429
12 Months or Greater, Fair Value	2,060	0
Total, Unrealized Loss Position, Fair Value	6,617	31,429
Less than 12 Months, Unrealized Loss	-2	-34
12 Months or Greater, Unrealized Loss	-1	0
Total, Unrealized Loss	-3	-34
U.S. government and agency securities	'	'
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	162,279	15,926
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	162,279	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 $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost	'
Due within one year	$263,528
Due within one to two years	22,648
Total	286,176
Fair Value	'
Due within one year	263,542
Due within one to two years	22,639
Total	$286,181

Intangible_Assets_Details

Intangible Assets (Details) (Patents, USD $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, unless otherwise specified
Patents	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Acquired intellectual property	$6,546	$1,546
Less: amortization	-343	-188
Total	$6,203	$1,358

Intangible_Assets_Amortization

Intangible Assets Amortization expense (Details) (Patents, USD $)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Patents	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Amortization of Intangible Assets	$155,000	$13,000
Acquired Finite-lived Intangible Asset, Amount	$5,000,000	'
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	'13 years	'

Intangible_Assets_Future_Amort

Intangible Assets Future Amortization Expense (Details) (Patents, USD $)	Oct. 31, 2013	Jul. 31, 2013
In Thousands, unless otherwise specified
Patents	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Remaining 2014	$615	'
2015	761	'
2016	704	'
2017	611	'
2018	484	'
2019 and thereafter	3,028	'
Total	$6,203	$1,358

Commitments_and_Contingencies_1

Commitments and Contingencies Lease commitment schedule (Details) (USD $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Remaining 2014	$7,038
2015	13,416
2016	13,563
2017	12,591
2018	11,427
2019 and thereafter	52,300
Committed gross lease payments	110,335
Less: proceeds from sublease rental	-10,700
Net operating lease obligation	$99,635

Commitments_and_Contingencies_2

Commitments and Contingencies (Textuals) (Details) (USD $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Contractual Obligation	$25,300

Equity_Award_Plans_Stock_Optio

Equity Award Plans (Stock Options Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Options, Outstanding Roll Forward	'	'
Balance, beginning (in shares)	10,033	'
Options granted (in shares)	0	'
Options forfeited (in shares)	-154	'
Options exercised (in shares)	-676	'
Balance, ending (in shares)	9,203	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)	$10.82	'
Options exercised (in usd per share)	$6.82	'
Balance, ending (in usd per share)	$12.12	$11.74
Options, Additional Disclosures	'	'
Weighted-Average Remaining Contractual Life	'7 years 7 months	'7 years 9 months
Aggregate Intrinsic Value	$276,458	$373,228
Options vested and expected to vest, Number of Shares	8,859	'
Options vested and expected to vest, Weighted-Average Exercise Price	$11.96	'
Options vested and exected to vest, Weighted-Average Remaining Contractual Term	'7 years 7 months	'
Options vested and expected to vest, Aggregate Intrinsic Value	267,542	'
Options exercisable, Number of Shares	4,950	'
Options exercisable, Weighted-Average Exercise Price	$8.79	'
Options exercisable, Weighted-Average Remaining Contractual Term	'7 years 3 months	'
Optios exercisable, Aggregate Intrinsic Value	$165,182	'

Equity_Award_Plans_Restricted_

Equity Award Plans (Restricted Stock Units Award Activity) (Details) (Restricted Stock Units (RSUs), USD $)	3 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Restricted Stock Units (RSUs)	'	'
RSUs, Outstanding Roll Forward	'	'
Balance, beginning (in shares)	2,241	'
RSUs granted (in shares)	459	'
RSUs vested (in shares)	-52	'
RSUs forfeited (in shares)	-83	'
Balance, ending (in shares)	2,565	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)	$46.03	'
RSUs vested (in usd per share)	$64.35	'
RSUs forfeited (in usd per share)	$55.20	'
Balance, ending (in usd per share)	$52.63	$54.36
RSUs, Additional Disclosures	'	'
Weighted-Average Remaining Contractual Term	'1 year 6 months	'1 year 6 months
Aggregate Intrinsic Value	$108,140	$109,675
RSUs vested and expected to vest, Number of Shares	2,315	'
RSUs vested and expected to vest, Weighted-Average Grant-Date Fair Value Per Share	$52.74	'
RSUs vested and expected to vest, Weighted-Average Remaining Contractual Term	'1 year 5 months	'
RSUs vested and expected to vest, Aggregate Intrinsic Value	$97,600	'

Equity_Award_Plans_Employee_St

Equity Award Plans Employee Stock Purchase Plan, Valuation Assumptions (Details) (Employee Stock Purchase Plan (ESPP))	3 Months Ended
	Oct. 31, 2013
Employee Stock Purchase Plan (ESPP)	'
Share-based Compensation Arrangement by Share-based Payment Award	'
Risk-free interest rate	0.00%
Expected Term	'6 months
Volatility	39.00%
Dividend yield	0.00%

Equity_Award_Plans_Allocation_

Equity Award Plans (Allocation of Share Based Compensation Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'
Allocated Share-based Compensation Expense	$14,411	$8,342
Cost of revenue	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'
Allocated Share-based Compensation Expense	1,663	610
Research and development	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'
Allocated Share-based Compensation Expense	3,262	1,690
Sales and marketing	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'
Allocated Share-based Compensation Expense	6,628	4,298
General and administrative	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'
Allocated Share-based Compensation Expense	$2,858	$1,744

Equity_Award_Plans_Allocation_1

Equity Award Plans Allocation of Share-based Compensation 2 (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award	'	'
Total compensation cost not yet recognized, nonvested awards, net of estimated forfeitures	$137,222	'
Allocated Share-based Compensation Expense	14,411	8,342
Period for Recognition of Total Compensation Cost Not yet Recognized	'3 years	'
Plan Modification, Incremental Compensation Cost	'	1,400
Employee Stock Purchase Plan (ESPP)	'	'
Share-based Compensation Arrangement by Share-based Payment Award	'	'
Allocated Share-based Compensation Expense	$1,002	$1,344

Income_Taxes_Details

Income Taxes (Details)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Effective income tax rate	-19.00%	-10.00%

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
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]	'	'
Net loss attributable to common stockholders	($7,861)	($3,515)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)	71,681	66,813
Net loss per share attributable to common stockholders, basic and diluted (in usd per share)	($0.11)	($0.05)

Net_Income_Loss_Per_Share_Sche

Net Income (Loss) Per Share (Schedule of Antidilutive Securities Excluded from Computation) (Details)	3 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Options to purchase common stock	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Antidilutive securities (in shares)	9,203	13,408
RSUs	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Antidilutive securities (in shares)	2,565	216
ESPP shares	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'
Antidilutive securities (in shares)	53	0