Palo Alto Networks (PANW) 10-K 18 Sep 14 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Jul. 31, 2014	Sep. 10, 2014	Jan. 31, 2014
Document Information [Abstract]	'	'	'
Entity Registrant Name	'Palo Alto Networks Inc	'	'
Entity Central Index Key	'0001327567	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Jul-14	'	'
Amendment Flag	'false	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'FY	'	'
Document Fiscal Year End Date	'--07-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	79,628,471	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$3,496,229,947

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$653,812	$310,614
Short-term investments	118,690	109,007
Accounts receivable, net of allowance for doubtful accounts of $471 and $51 at July 31, 2014 and July 31, 2013, respectively	135,518	87,461
Prepaid expenses and other current assets	50,306	22,617
Total current assets	958,326	529,699
Property and equipment, net	48,744	32,086
Long-term investments	201,880	17,314
Goodwill	155,033	0
Intangible assets, net	47,955	1,358
Other assets	66,528	5,149
Total assets	1,478,466	585,606
Current liabilities:	'	'
Accounts payable	14,526	15,544
Accrued compensation	48,727	22,004
Accrued and other liabilities	25,000	14,609
Deferred revenue	259,918	153,945
Total current liabilities	348,171	206,102
Convertible senior notes, net	466,875	0
Long-term deferred revenue	162,660	95,285
Other long-term liabilities	32,177	11,799
Commitments and contingencies (Note 8)	'	'
Stockholders' equity:	'	'
Preferred stock, $0.0001 par value; 100,000 shares authorized; none issued and outstanding at July 31, 2014 and July 31, 2013	0	0
Common stock, $0.0001 par value; 1,000,000 shares authorized; 79,519 and 71,612 shares issued and outstanding at July 31, 2014 and July 31, 2013, respectively	8	7
Additional paid-in capital	804,406	381,703
Accumulated other comprehensive loss	-105	-16
Accumulated deficit	-335,726	-109,274
Total stockholders’ equity	468,583	272,420
Total liabilities and stockholders’ equity	$1,478,466	$585,606

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, except Share data, unless otherwise specified
Current assets:	'	'
Allowance for doubtful accounts (in usd)	$471	$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)	79,519,000	71,612,000
Common Stock, Shares, Outstanding (in shares)	79,519,000	71,612,000

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Revenue:	'	'	'	'	'	'	'	'	'	'	'
Product	$99,707	$84,128	$80,823	$75,485	$65,456	$60,793	$61,944	$55,514	$340,143	$243,707	$174,462
Services	78,524	66,572	60,245	52,695	46,929	40,496	34,555	30,420	258,036	152,400	80,676
Total revenue	178,231	150,700	141,068	128,180	112,385	101,289	96,499	85,934	598,179	396,107	255,138
Cost of revenue:	'	'	'	'	'	'	'	'	'	'	'
Product	26,903	20,425	20,221	17,954	16,505	15,855	16,636	14,416	85,503	63,412	44,615
Services	21,704	19,285	17,283	15,853	13,753	11,835	10,982	9,774	74,125	46,344	25,938
Total cost of revenue	48,607	39,710	37,504	33,807	30,258	27,690	27,618	24,190	159,628	109,756	70,553
Total gross profit	129,624	110,990	103,564	94,373	82,127	73,599	68,881	61,744	438,551	286,351	184,585
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	32,830	27,837	24,253	19,893	17,627	16,048	15,495	13,312	104,813	62,482	38,570
Sales and marketing	106,668	83,995	76,734	67,366	59,635	51,733	45,796	42,607	334,763	199,771	115,917
General and administrative	15,574	23,717	19,733	14,125	11,748	12,268	9,747	8,956	73,149	42,719	26,207
Legal settlement (Note 9)	0	121,173	20,000	0	'	'	'	'	141,173	0	0
Total operating expenses	155,072	256,722	140,720	101,384	89,010	80,049	71,038	64,875	653,898	304,972	180,694
Operating income (loss)	-25,448	-145,732	-37,156	-7,011	-6,883	-6,450	-2,157	-3,131	-215,347	-18,621	3,891
Interest expense	-1,848	-13	-14	-8	-9	-18	-7	-40	-1,883	-74	-36
Other income (expense), net	-5,595	430	-170	405	14	-6	63	-32	-4,930	39	-1,056
Income (loss) before income taxes	-32,891	-145,315	-37,340	-6,614	-6,878	-6,474	-2,101	-3,203	-222,160	-18,656	2,799
Provision for income taxes	-833	1,272	2,606	1,247	8,958	808	512	312	4,292	10,590	2,062
Net income (loss)	-32,058	-146,587	-39,946	-7,861	-15,836	-7,282	-2,613	-3,515	-226,452	-29,246	737
Net income (loss) attributable to common stockholders, basic and diluted	'	'	'	'	'	'	'	'	($226,452)	($29,246)	$0
Net income (loss) per share attributable to common stockholders, basic and diluted (in usd per share)	($0.41)	($1.96)	($0.55)	($0.11)	($0.22)	($0.10)	($0.04)	($0.05)	($3.05)	($0.43)	$0
Weighted-average shares used to compute net income (loss) per share attributable to common stockholders, basic and diluted (in shares)	'	'	'	'	'	'	'	'	74,291	68,682	19,569

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Net income (loss)	($226,452)	($29,246)	$737
Other comprehensive income (loss), net of tax:	'	'	'
Change in unrealized gains (losses) on investments	-72	-15	0
Reclassification adjustment for realized net gains on investments included in net loss	-17	-1	0
Net change	-89	-16	0
Comprehensive income (loss)	($226,541)	($29,262)	$737

CONSOLIDATED_STATEMENTS_OF_RED

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) Statement (USD $)	Total	Redeemable Convertible Preferred Stock	Common Stock	Restricted Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
In Thousands, except Share data, unless otherwise specified	USD ($)	USD ($)	USD ($)		USD ($)	USD ($)	USD ($)
Beginning balance at Jul. 31, 2011	($71,454)	'	$2	'	$9,309	$0	($80,765)
Redeemable convertible preferred stock,beginning balance at Jul. 31, 2011	'	64,491	'	'	'	'	'
Redeemable convertible preferred stock, beginning balance (in shares) at Jul. 31, 2011	'	41,084,000	'	'	'	'	'
Common stock, beginning balance (in shares) at Jul. 31, 2011	'	'	19,751,000	'	'	'	'
Increase in Stockholders' Equity	'	'	'	'	'	'	'
Net income (loss)	737	'	'	'	'	'	737
Redeemable convertible preferred stock converted into common stock upon initial public offering (in shares)	'	-41,305,000	'	'	'	'	'
Redeemable convertible preferred stock converted into common stock upon initial public offering	-67,517	-67,517	'	'	'	'	'
Conversion of redeemable convertible preferred stock into common stock upon initial public offering (in shares)	'	'	41,305,000	'	'	'	'
Conversion of redeemable convertible preferred stock into common stock upon initial public offering	67,517	'	4	'	67,513	'	'
Issuance of common stock from initial public offering (in shares)	'	'	5,617,000	'	'	'	'
Issuance of common stock from initial public offering, net of offering costs	215,375	'	1	'	215,374	'	'
Other comprehensive loss	'	'	'	'	'	0	'
Stock option exercises, net of unvested portion and excess tax benefit (in shares)	'	'	1,044,000	'	'	'	'
Stock option exercises, net of unvested portion and excess tax benefit	2,422	'	0	'	2,422	'	'
Share-based compensation for equity based awards	13,837	'	'	'	13,837	'	'
Repurchase of unvested restricted common stock from terminated employees (in shares)	'	'	-57,000	'	'	'	'
Issuance of restricted common stock to employees (in shares)	'	'	192,000	'	'	'	'
Issuance of restricted common stock to employees	0	'	0	'	'	'	'
Proceeds from settlement of note receivable	637	'	'	'	637	'	'
Exercise of preferred stock warrants (in shares)	'	221,000	'	'	'	'	'
Exercise of preferred stock warrants	3,026	3,026	'	'	'	'	'
Ending balance at Jul. 31, 2012	229,071	'	7	'	309,092	0	-80,028
Redeemable convertible preferred stock,ending balance at Jul. 31, 2012	'	0	'	'	'	'	'
Redeemable convertible preferred stock, ending balance (in shares) at Jul. 31, 2012	'	0	'	'	'	'	'
Common stock, ending balance (in shares) at Jul. 31, 2012	'	'	67,852,000	'	'	'	'
Increase in Stockholders' Equity	'	'	'	'	'	'	'
Net income (loss)	-29,246	'	'	'	'	'	-29,246
Redeemable convertible preferred stock converted into common stock upon initial public offering	0	'	'	'	'	'	'
Other comprehensive loss	-16	'	'	'	'	-16	'
Stock option exercises, net of unvested portion and excess tax benefit (in shares)	'	'	3,627,000	'	'	'	'
Stock option exercises, net of unvested portion and excess tax benefit	22,640	'	0	'	22,640	'	'
Issuance of common stock upon vesting of restricted stock units (in shares)	'	'	5,000	'	'	'	'
Issuance of common stock upon vesting of restricted stock units	0	'	0	'	'	'	'
Issuance of common stock in connection with employee stock purchase plan (in shares)	'	'	170,000	'	'	'	'
Issuance of common stock in connection with employee stock purchase plan	6,267	'	0	'	6,267	'	'
Share-based compensation for equity based awards	43,704	'	'	'	43,704	'	'
Repurchase of unvested restricted common stock from terminated employees (in shares)	'	'	-42,000	'	'	'	'
Exercise of preferred stock warrants	0	'	'	'	'	'	'
Ending balance at Jul. 31, 2013	272,420	'	7	'	381,703	-16	-109,274
Redeemable convertible preferred stock,ending balance at Jul. 31, 2013	'	0	'	'	'	'	'
Redeemable convertible preferred stock, ending balance (in shares) at Jul. 31, 2013	0	0	'	'	'	'	'
Common stock, ending balance (in shares) at Jul. 31, 2013	71,612,000	'	71,612,000	'	'	'	'
Increase in Stockholders' Equity	'	'	'	'	'	'	'
Net income (loss)	-226,452	'	'	'	'	'	-226,452
Issuance of common stock in connection with legal settlement (in shares)	'	'	1,544,000	'	'	'	'
Issuance of common stock in connection with legal settlement	113,332	'	0	'	113,332	'	'
Issuance of common stock in connection with acquisition (in shares)	'	'	1,281,000	276,000	'	'	'
Issuance of common stock in connection with acquisition	87,477	'	0	'	87,477	'	'
Equity component of convertible senior notes, net	106,836	'	'	'	106,836	'	'
Purchase of convertible senior note hedges	-110,975	'	'	'	-110,975	'	'
Issuance of warrants	78,258	'	'	'	78,258	'	'
Redeemable convertible preferred stock converted into common stock upon initial public offering	0	'	'	'	'	'	'
Other comprehensive loss	-89	'	'	'	'	-89	'
Stock option exercises, net of unvested portion and excess tax benefit (in shares)	3,645,000	'	3,645,000	'	'	'	'
Stock option exercises, net of unvested portion and excess tax benefit	35,133	'	1	'	35,132	'	'
Issuance of common stock upon vesting of restricted stock units (in shares)	'	'	870,000	'	'	'	'
Issuance of common stock upon vesting of restricted stock units	0	'	0	'	'	'	'
Issuance of common stock in connection with employee stock purchase plan (in shares)	'	'	319,000	'	'	'	'
Issuance of common stock in connection with employee stock purchase plan	12,869	'	0	'	12,869	'	'
Share-based compensation for equity based awards	99,774	'	'	'	99,774	'	'
Repurchase of unvested restricted common stock from terminated employees (in shares)	-28,000	'	-28,000	'	'	'	'
Exercise of preferred stock warrants	0	'	'	'	'	'	'
Ending balance at Jul. 31, 2014	468,583	'	8	'	804,406	-105	-335,726
Redeemable convertible preferred stock,ending balance at Jul. 31, 2014	'	$0	'	'	'	'	'
Redeemable convertible preferred stock, ending balance (in shares) at Jul. 31, 2014	0	0	'	'	'	'	'
Common stock, ending balance (in shares) at Jul. 31, 2014	79,519,000	'	79,519,000	'	'	'	'

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Cash flows from operating activities	'	'	'
Net income (loss)	($226,452)	($29,246)	$737
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Share-based compensation for equity based awards	99,774	43,704	13,837
Issuance of common stock for legal settlement	46,173	0	0
Depreciation and amortization	19,419	9,892	6,134
Amortization of investment premiums, net of accretion of purchase discounts	1,518	1,943	0
Amortization of debt discount and debt issuance costs	1,826	0	0
Change in fair value of common stock warrant	5,859	0	0
Excess tax benefit from share-based compensation	-957	-6,762	-215
Change in fair value of preferred stock warrants	0	0	958
Loss on facility sublease	0	262	0
Changes in operating assets and liabilities:	'	'	'
Accounts receivable, net	-47,949	-41,819	-15,965
Prepaid expenses and other assets	-10,308	-8,865	-11,063
Accounts payable	-1,100	5,830	3,779
Accrued compensation	26,331	10,697	2,066
Accrued and other liabilities	1,076	15,461	7,846
Deferred revenue	173,196	113,422	68,553
Reimbursement of cost of leasehold improvements	0	0	701
Net cash provided by operating activities	88,406	114,519	77,368
Cash flows from investing activities	'	'	'
Purchase of investments	-506,642	-345,324	0
Proceeds from sales of investments	74,597	13,491	0
Proceeds from maturities of investments	233,530	202,710	0
Acquisition of business, net of cash acquired	-85,726	0	0
Purchase of property, equipment, and other assets	-36,107	-22,442	-14,565
Net cash used in investing activities	-320,348	-151,565	-14,565
Cash flows from financing activities	'	'	'
Proceeds from borrowings on convertible senior notes, net	560,433	0	0
Proceeds from issuance of warrants	78,258	0	0
Purchase of convertible note hedges	-110,975	0	0
Proceeds from exercise of stock options	33,730	14,765	1,956
Proceeds from employee stock purchase plan	12,869	6,267	0
Excess tax benefit from share-based compensation	957	6,762	215
Proceeds from settlement of note receivable	0	0	637
Payments of initial public offering costs	0	-2,698	0
Proceeds from initial public offering, net of offering costs	0	0	215,375
Change in restricted cash	0	0	1,221
Repurchase of restricted common stock from terminated employees	-132	-78	-82
Net cash provided by financing activities	575,140	25,018	219,322
Net increase (decrease) in cash and cash equivalents	343,198	-12,028	282,125
Cash and cash equivalents—beginning of period	310,614	322,642	40,517
Cash and cash equivalents—end of period	653,812	310,614	322,642
Supplemental disclosures of cash flow information	'	'	'
Cash paid for income taxes	1,523	304	1,355
Cash paid for interest	44	58	23
Non-cash investing and financing activities	'	'	'
Issuance of common stock in connection with acquisition	87,477	0	0
Conversion of preferred stock into common stock	0	0	67,517
Issuance of preferred stock upon exercise of warrant	$0	$0	$3,026

Description_of_Business_and_Su

Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Jul. 31, 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 organizations by safely enabling the increasingly complex and rapidly growing number of applications running on their networks and by preventing breaches stemming from targeted cyber attacks.
	Our enterprise security platform consists of three major elements: our Next-Generation Firewall, our Advanced Endpoint Protection, and our 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 Advanced Endpoint Protection, which we expect to release in fiscal 2015, prevents cyber attacks that aim to exploit software vulnerabilities on a broad variety of fixed and virtual endpoints. Our Threat Intelligence Cloud provides central intelligence capabilities as well as automated delivery of preventative measures against cyber attacks. The cloud-based element of our platform is delivered in the form of a service that can be used either in the public cloud or in a private cloud using a dedicated appliance.
	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 consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles. The consolidated financial statements include all adjustments necessary for a fair presentation of our annual results. All adjustments are of a normal recurring nature. Certain prior period amounts have been reclassified to conform with current period presentation.
	Principles of Consolidation
	The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Such management estimates include the best estimate of selling price for our products and services, share-based compensation, fair value of assets acquired and liabilities assumed in business combinations, the assessment of recoverability of our property and equipment, identified intangibles and goodwill, future taxable income, contract manufacturer liabilities, and loss contingencies. We base our estimates on historical experience and also on assumptions that we believe are reasonable. Actual results could differ materially from those estimates.
	Concentrations
	Financial instruments that subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments, and accounts receivable. We invest only in high-quality credit instruments and maintain our cash and cash equivalents and available-for-sale investments in fixed income securities. Management believes that the financial institutions that hold our investments are financially sound and, accordingly, are subject to minimal credit risk. Deposits held with banks may exceed the amount of insurance provided on such deposits.
	Our accounts receivables are primarily derived from our channel partners representing various geographical locations. We perform ongoing credit evaluations of our channel partners and generally do not require collateral on accounts receivable. We maintain an allowance for doubtful accounts for estimated potential credit losses. As of July 31, 2014, three partners represented 36%, 24%, and 13% of our gross accounts receivable. For fiscal 2014, three partners represented 32%, 25%, and 13% of our total revenue. We rely on an independent contract manufacturer to assemble most of our products and sole suppliers for a certain number of our components.
	Comprehensive Income (Loss)
	Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). Unrealized gains and losses on available-for-sale investments are included in our other comprehensive income or loss.
	Foreign Currency Transactions
	The functional currency of our foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities denominated in foreign currencies have been remeasured into U.S. dollars using the exchange rates in effect at the balance sheet dates. Foreign currency denominated income and expenses have been remeasured using the average exchange rates in effect during each period. Foreign currency remeasurement gains and losses and foreign currency transaction gains and losses are not significant to the financial statements.
	Cash and Cash Equivalents
	We consider all highly liquid investments held at financial institutions, such as commercial paper, money market funds, and other money market securities with original maturities of three months or less at date of purchase to be cash equivalents.
	Fair Value of Financial Instruments
	We define fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, we consider the principal or most advantageous market in which to transact and the market-based risk. We apply fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. The carrying amounts reported in the consolidated financial statements approximate the fair value for cash and cash equivalents, accounts receivable, accounts payable, and accrued liabilities, due to their short-term nature.
	Investments
	We classify our investments as available-for-sale at the time of purchase since it is our intent that these investments are available for current operations, and include these investments on our balance sheet as either short-term or long-term investments depending on their maturity. Investments not considered cash equivalents and with maturities one year or less from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments.
	Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. We consult with our investment managers and consider available quantitative and qualitative evidence in evaluating potential impairment of our investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, we evaluate, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and our intent and ability to hold the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on our assessment of the collectability of accounts. Management regularly reviews the adequacy of the allowance for doubtful accounts by considering the age of each outstanding invoice, each partner’s expected ability to pay, and the collection history with each partner, when applicable, to determine whether a specific allowance is appropriate. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified. As of July 31, 2014 and 2013, the allowance for doubtful accounts activity was not significant.
	Property and Equipment
	Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, generally three to ten years. Leasehold improvements are depreciated over the shorter of the estimated useful lives of the improvements or the remaining lease term.
	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.
	Through July 31, 2014, we have not recognized any impairment losses on our goodwill, intangible assets, and long-lived assets.
	Contract Manufacturer Liabilities
	We outsource most of our manufacturing, repair, and supply chain management operations to our independent contract manufacturer and payments to it are a significant portion of our product cost of revenues. Although we could be contractually obligated to purchase manufactured products, we generally do not own the manufactured products. Product title transfers from our independent contract manufacturer to us and immediately to our partners upon shipment. Our independent contract manufacturer assembles our products using design specifications, quality assurance programs, and standards that we establish and it procures components and assembles our products based on our demand forecasts. These forecasts represent our estimates of future demand for our products based upon historical trends and analysis from our sales and product management functions as adjusted for overall market conditions. If the actual component usage and product demand are significantly lower than forecast, we accrue for costs for contractual manufacturing commitments in excess of our forecasted demand including costs for excess components or for carrying costs incurred by our contract manufacturer. Through July 31, 2014, we have not accrued any significant costs associated with this exposure.
	Convertible Senior Notes
	On June 30, 2014, we issued $575,000,000 aggregate principal amount of 0.0% convertible senior notes due 2019 (the "Notes"). In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. This difference represents a debt discount that is amortized to interest expense using the effective interest method over the term of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes. Transaction costs attributable to the liability component are being amortized to interest expense using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were netted with the equity component of the Notes in additional paid-in capital in the consolidated balance sheets.
	Revenue Recognition
	We generate revenue from the sales of hardware and software products, subscriptions, support and maintenance, and other services primarily through a direct sales force and indirect relationships with our partners.
	Revenue is recognized when all of the following criteria are met:
	•	Persuasive Evidence of an Arrangement Exists. We rely upon non-cancelable sales agreements and purchase orders to determine the existence of an arrangement.
	•	Delivery has Occurred. We use shipping documents or transmissions of product or service contract registration codes to determine delivery.
	•	The Fee is Fixed or Determinable. We assess whether the fee is fixed or determinable based on the payment terms associated with the transaction.
	•	Collectability is Reasonably Assured. We assess collectability based on credit analysis and payment history.
	We recognize product revenue at the time of shipment provided that all other revenue recognition criteria have been met. Our partners generally receive an order from an end-customer prior to placing an order with us. In addition, payment from our partners is not contingent on the partner’s success in sales to end-customers. Our partners generally do not stock appliances and only have limited stock rotation rights and no price protection rights. When necessary, we make certain estimates and maintain allowances for sales returns and other programs based on our historical experience. To date, these estimates have not been significant. We recognize services revenue from subscriptions and support and maintenance ratably over the contractual service period, which is typically one to five years. Other services revenue is recognized as the services are rendered and has not been significant to date.
	Most of our arrangements, other than renewals of subscriptions and support and maintenance, are multiple-element arrangements with a combination of hardware, software, subscriptions, support and maintenance, and other services. Products and services generally qualify as separate units of accounting. Our hardware deliverables typically include proprietary operating system software, which together deliver the essential functionality of our products. For multiple-element arrangements, we allocate revenue to each unit of accounting based on an estimated selling price at the arrangement inception. The estimated selling price for each element is based upon the following hierarchy: vendor-specific objective evidence (VSOE) of selling price, if available, third-party evidence (TPE) of selling price, if VSOE of selling price is not available, or best estimate of selling price (BESP), if neither VSOE of selling price nor TPE of selling price are available. The total arrangement consideration is allocated to each separate unit of accounting using the relative estimated selling prices of each unit based on the aforementioned selling price hierarchy. We limit the amount of revenue recognized for delivered elements to an amount that is not contingent upon future delivery of additional products or services or meeting of any specified performance conditions.
	To determine the estimated selling price in multiple-element arrangements, we establish VSOE of selling price using the prices charged for a deliverable when sold separately. If VSOE of selling price cannot be established for a deliverable, we establish TPE of selling price by evaluating similar and interchangeable competitor products or services in standalone arrangements with similarly situated partners. However, as our products contain a significant element of proprietary technology and offer substantially different features and functionality from our competitors, we are unable to obtain comparable pricing of our competitors’ products with similar functionality on a standalone basis. Therefore, we have not been able to obtain reliable evidence of TPE of selling price. If neither VSOE nor TPE of selling price can be established for a deliverable, we establish BESP primarily based on historical transaction pricing. Historical transactions are segregated based on our pricing model and our go-to-market strategy, which include factors such as type of sales channel (reseller, distributor, or end-customer), the geographies in which our products and services were sold (domestic or international), offering type (products or services), and whether or not the opportunity was identified by our sales force or by our partners. In analyzing historical transaction pricing we evaluate whether a majority of the prices charged for a product or service, as represented by a percentage of list price, fall within a reasonable range. To further support the best estimate of selling price as determined by the historical transaction pricing or when such information is unavailable, such as when there are limited sales of a new product or service, we consider the same factors we have established through our pricing model and go-to-market strategy. The determination of BESP is made through consultation with and approval by our management.
	In multiple-element arrangements where software deliverables are included, revenue is allocated to each separate unit of accounting for each of the non-software deliverables and to the software deliverables as a group using the relative estimated selling prices of each of the deliverables in the arrangement based on the aforementioned estimated selling price hierarchy. The arrangement consideration allocated to the software deliverables as a group is then allocated to each software deliverable using the residual method when VSOE of fair value of the undelivered items exists. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration less the aggregate fair value of any undelivered elements. In determining VSOE of fair value, we evaluate whether a substantial majority of the historical prices charged for a product or service sold on a standalone basis, as represented by a percentage of list price, fall within a reasonably narrow range. If VSOE of fair value of one or more undelivered items does not exist, revenue from the entire arrangement is deferred and recognized at the earlier of: (i) delivery of those elements or (ii) when fair value can be established unless support and maintenance is the only undelivered element, in which case, the entire arrangement fee is recognized ratably over the contractual service period.
	We account for multiple agreements with a single partner as one arrangement if the contractual terms and/or substance of those agreements indicate that they may be so closely related that they are, in effect, parts of a single arrangement.
	Revenues are reported net of sales taxes. Shipping charges billed to partners are included in revenues and related costs are included in cost of revenue. Sales commissions and other incremental costs to acquire contracts are also expensed as incurred. After receipt of a partner order, any amounts billed in excess of revenue recognized are recorded as deferred revenue.
	Advertising Costs
	Advertising costs, which are expensed and included in sales and marketing expense when incurred, were $3,693,000, $1,808,000, and $1,604,000, during the years ended July 31, 2014, 2013, and 2012, respectively.
	Software Development Costs
	Internally developed software includes enterprise-level business software that we are customizing to meet our specific operational needs. These capitalized costs consisted of the external direct costs and the internal payroll and payroll related costs that are related to the implementation of our enterprise resource planning software system and will be amortized over a useful life of five years.
	The costs to develop software that is marketed externally have not been capitalized as we believe our current software development process is essentially completed concurrent with the establishment of technological feasibility. As such, all related software development costs are expensed as incurred and included in research and development expense in our consolidated statements of operations.
	Share-Based Compensation
	Compensation expense related to share-based transactions, including employee and non-employee director awards, is measured and recognized in the financial statements based on fair value on the grant date. The fair value of restricted stock units (RSUs) is based on the closing market price of our common stock on the date of grant. The fair value of option awards and purchases under our 2012 Equity Incentive Plan (the “2012 Plan”) and 2012 Employee Stock Purchase Plan (the “2012 ESPP”) is estimated using the Black-Scholes option-pricing model. This model requires the input of the fair value of our common stock and that at the date of grant we determine the expected term of the award, the expected volatility of the price of our common stock, risk-free interest rates, and expected dividend yield of our common stock. The share-based compensation expense, net of forfeitures, is recognized using a straight-line basis over the requisite service periods of the awards. We estimate a forfeiture rate to calculate the share-based compensation expense for our awards. Our forfeiture rate is based on an analysis of our actual historical forfeitures.
	Income Taxes
	We account for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our financial statements or tax returns. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carryforwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.
Significant judgment is required in determining any valuation allowance recorded against deferred tax assets. In assessing the need for a valuation allowance, we consider all available evidence, including past operating results, estimates of future taxable income, and the feasibility of tax planning strategies. In the event that we change our determination as to the amount of deferred tax assets that can be realized, we will adjust our valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made.
We apply the authoritative accounting guidance prescribing a threshold and measurement attribute for the financial recognition and measurement of a tax position taken or expected to be taken in a tax return. We recognize liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step requires us to estimate and measure the tax benefit as the largest amount that is more likely than not to be realized upon ultimate settlement.
Loss Contingencies
We are subject to the possibility of various loss contingencies arising in the ordinary course of business. We consider the likelihood of loss or impairment of an asset, or the incurrence of a liability, as well as our ability to reasonably estimate the amount of loss, in determining loss contingencies. An estimated loss contingency is accrued when it is probable that an asset has been impaired or a liability has been incurred and the amount of loss can be reasonably estimated. If we determine that a loss is possible and the range of the loss can be reasonably determined, then we disclose the range of the possible loss. We regularly evaluate current information available to us to determine whether an accrual is required, an accrual should be adjusted or a range of possible loss should be disclosed.
Recent Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09 regarding Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers. The standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance is effective for us in the first quarter of fiscal 2018 using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within the guidance; or (ii) retrospective with the cumulative effect of initially applying the guidance recognized at the date of initial application and providing certain additional disclosures as defined per the guidance. Early adoption is not permitted. We are currently evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.
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 consolidated financial statements.
In February 2013, the FASB issued ASU 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	12 Months Ended
	Jul. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	We categorize assets and liabilities recorded at fair value on our consolidated balance sheets based upon the level of judgment associated with inputs used to measure their fair value. The categories are as follows:
	•	Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	•	Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.
	•	Level 3—Inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.
	The following table presents the fair value of our financial assets and liabilities using the above input categories as of July 31, 2014 and July 31, 2013 (in thousands):
			July 31, 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		—		—		—		—		—		46,700		—		46,700
	Money market funds		—		—		—		—		131,845		—		—		131,845
	Total cash equivalents		—		—		—		—		133,667		46,700		—		180,367
	Short-term investments:
	Corporate debt securities		—		22,239		—		22,239		—		32,834		—		32,834
	U.S. government and agency securities		—		96,451		—		96,451		—		76,173		—		76,173
	Total short-term investments		—		118,690		—		118,690		—		109,007		—		109,007
	Long-term investments:
	Certificates of deposit		—		1,000		—		1,000		—		—		—		—
	Corporate debt securities		—		39,018		—		39,018		—		12,317		—		12,317
	U.S. government and agency securities		—		161,862		—		161,862		—		4,997		—		4,997
	Total long-term investments		—		201,880		—		201,880		—		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	$	320,570	$	—	$	321,790	$	134,888	$	173,021	$	—	$	307,909
	Refer to Note 7. Convertible Senior Notes for the carrying amount and estimated fair value of the Notes, which were not recorded at fair value as of July 31, 2014.

Investments

Investments	12 Months Ended
	Jul. 31, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	Investments
	The following table summarizes the unrealized gains and losses and fair value of our investments as of July 31, 2014 and July 31, 2013 (in thousands):
		31-Jul-14
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	1,000	$	—		$	—		$	1,000
	Corporate debt securities	61,299		16			(58		)	61,257
	U.S. government and agency securities	258,376		45			(108		)	258,313
	Total	$	320,675	$	61		$	(166	)	$	320,570
		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 table presents our investments that were in an unrealized loss position as of July 31, 2014 and July 31, 2013 (in thousands):
		31-Jul-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	$	43,868	$	(58	)	$	—		$	—	$	43,868	$	(58	)
	U.S. government and agency securities	142,490		(108		)	—			—		142,490		(108		)
	Total	$	186,358	$	(166	)	$	—		$	—	$	186,358	$	(166	)
		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 July 31, 2014.
	We received proceeds of $74,597,000, $13,491,000, and nil from sales of investments during the years ended July 31, 2014, 2013, and 2012, respectively. We use the specific identification method to determine the cost basis of investments sold. Through July 31, 2014, our realized gains and losses on sales of investments were not material.
	The following table summarizes the amortized cost and fair value of our investments as of July 31, 2014, by contractual years-to-maturity (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	118,678	$	118,690
	Due within one to two years	193,952		193,853
	Due within two to three years	8,045		8,027
	Total	$	320,675	$	320,570

Acquisitions

Acquisitions	12 Months Ended
	Jul. 31, 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. As of July 31, 2014, all of the restricted common stock issued in connection with the acquisition remained unvested.
	We expensed the related acquisition costs in the amount of $3,940,000 in general and administrative expenses for the year ended July 31, 2014.
	The following table summarizes our allocation of the purchase consideration based on the estimated fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Cash	$	6,930
	Goodwill	144,906
	Identified intangible assets	42,300
	Accrued and other liabilities, net	(6,950		)
	Long-term deferred tax liability, net	(9,539		)
	Total	$	177,647
	The estimated fair values of assets acquired and liabilities assumed in the table above have been adjusted to reflect a change in our estimated blended state tax rate during the measurement period. Additional adjustments to current and noncurrent income taxes payable and deferred taxes may be required as additional information is received and certain tax returns are finalized. We expect to finalize the allocation of the purchase consideration to the assets acquired and liabilities assumed 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 income tax purposes.
	Cyvera’s operating results are included in our 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 years ended July 31, 2014 and 2013, as though the companies were combined as of August 1, 2012 (in thousands):
		Year Ended July 31,
		2014			2013
	Total revenue	$	598,254		$	396,131
	Net loss	$	(241,920	)	$	(43,041	)
	The pro forma financial information for the years ended July 31, 2014 and 2013 has been calculated after adjusting our results and those of Cyvera to reflect the business combination accounting effects resulting from this acquisition as though the acquisition occurred as of August 1, 2012, including acquisition related transaction costs, 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 years ended July 31, 2014 and 2013 combines our historical results for the years ended July 31, 2014 and 2013 and the adjusted historical results of Cyvera for the twelve months ended June 30, 2014 and 2013, due to differences in reporting periods and considering the date we 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 allocation of the purchase consideration based on the estimated fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Goodwill	$	10,127
	Identified intangible assets	2,200
	Net liabilities assumed	(1,982		)
	Total	$	10,345
	The estimated fair values of assets acquired and liabilities assumed in the table above have been adjusted to reflect changes in our blended tax rate during the measurement period. Additional adjustments to current and noncurrent income taxes payable and deferred taxes may be required as additional information is received and certain tax returns are finalized. We expect to finalize the allocation of the purchase consideration to the assets acquired and liabilities assumed 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
	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 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 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 thirteen years.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Jul. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill
	The following table presents details of our goodwill during the year ended July 31, 2014 (in thousands):
		Gross Carrying Amount		Accumulated Impairment Loss			Net Carrying Amount
	Balance as of July 31, 2013	$	—	$	—		$	—
	Goodwill acquired	155,033		—			155,033
	Balance as of July 31, 2014	$	155,033	$	—		$	155,033
	Purchased Intangible Assets
	The following tables present details of our purchased intangible assets as of July 31, 2014 and July 31, 2013 (in thousands):
		31-Jul-14
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Intangible assets with finite lives:
	Developed technology	$	34,500	$	(1,643	)	$	32,857
	Acquired intellectual property	6,546		(958		)	5,588
	In-process research and development held for defensive purposes	1,900		(370		)	1,530
	Other	500		(120		)	380
	Total intangible assets with finite lives	43,446		(3,091		)	40,355
	In-process research and development with indefinite lives	7,600		—			7,600
	Total purchased intangible assets	$	51,046	$	(3,091	)	$	47,955
		31-Jul-13
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Acquired intellectual property	$	1,546	$	(188	)	$	1,358
	We recognized amortization expense of $2,903,000, $125,000, and $39,000 for the years ended July 31, 2014, 2013, and 2012, respectively.
	The following table summarizes our estimated future amortization expense of intangible assets with finite lives by type as of July 31, 2014 (in thousands):
		Fiscal Years Ending July 31,
		2015		2016			2017		2018		2019		2020 and Thereafter
	Developed technology	$	4,928	$	4,928		$	4,928	$	4,928	$	4,928	$	8,217
	Acquired intellectual property	761		704			611		484		399		2,629
	In-process research and development held for defensive purposes	633		633			264		—		—		—
	Other	250		130			—		—		—		—
	Total future amortization expense	$	6,572	$	6,395		$	5,803	$	5,412	$	5,327	$	10,846

Other_Financial_Information

Other Financial Information	12 Months Ended
	Jul. 31, 2014
Balance Sheet Related Disclosures [Abstract]	'
Other Financial Information	'
	Other Financial Information
	The following table presents details of property and equipment, net as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31,
		2014			2013
	Computers, equipment, and software	$	38,147		$	27,239
	Leasehold improvements	21,258			10,176
	Demonstration units	14,832			11,401
	Furniture and fixtures	5,129			2,746
	Total property and equipment	79,366			51,562
	Less: accumulated depreciation	(30,622		)	(19,476		)
	Total property and equipment, net	$	48,744		$	32,086
	We recognized depreciation expense of $14,028,000, $9,786,000, and $6,057,000 related to property and equipment during the years ended July 31, 2014, 2013, and 2012, respectively.
	The following table presents details of accrued and other liabilities as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31,
		2014			2013
	Accrued expenses payable	$	12,210		$	11,144
	Other liabilities	12,790			3,465
	Total accrued and other liabilities	$	25,000		$	14,609

Convertible_Senior_Notes

Convertible Senior Notes	12 Months Ended
	Jul. 31, 2014
Debt Disclosure [Abstract]	'
Convertible Senior Notes	'
	Convertible Senior Notes
	Convertible Senior Notes
	On June 30, 2014, we issued $575,000,000 aggregate principal amount of 0.0% convertible senior notes due 2019. The Notes are governed by an indenture between us, as the issuer, and U.S. Bank National Association, as Trustee. The Notes are unsecured, unsubordinated obligations that do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness, or the issuance or repurchase of securities by us or any of our subsidiaries. The Notes mature on July 1, 2019 unless converted or repurchased in accordance with their terms prior to such date. We cannot redeem the Notes prior to maturity.
	The Notes are convertible for up to 5,214,000 shares of our common stock at an initial conversion rate of approximately 9.068 shares of common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $110.28 per share of common stock, subject to adjustment. Holders of the Notes may surrender their Notes for conversion at their option at any time prior to the close of business on the business day immediately preceding January 1, 2019, only under the following circumstances:
	•	during any fiscal quarter commencing after the fiscal quarter ending on October 31, 2014 (and only during such fiscal quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day;
	•	during the five business day period after any five consecutive trading day period (the "measurement period"), in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate for the Notes on each such trading day; or
	•	upon the occurrence of specified corporate events.
	On or after January 1, 2019, holders may convert all or any portion of their Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. Upon conversion, holders will receive cash equal to the aggregate principal amount of the Notes to be converted, and, at our election, cash and/or shares of our common stock for any amounts in excess of the aggregate principal amount of the Notes being converted.
	The conversion price will be subject to adjustment in some events. Holders of the Notes who convert their Notes in connection with certain corporate events that constitute a “make-whole fundamental change” per the Indenture governing the Notes are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, upon the occurrence of a corporate event that constitutes a “fundamental change” per the Indenture governing the Notes, holders of the Notes may require us to repurchase for cash all or a portion of the Notes at a purchase price equal to 100% of the principal amount of the Notes plus accrued and unpaid contingent interest.
	In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. The difference between the principal amount of the Notes and the liability component (the "debt discount"), is amortized to interest expense using the effective interest method over the term of the Notes. The equity component of the Notes is included in additional paid-in capital in the consolidated balance sheets and is not remeasured as long as it continues to meet the conditions for equity classification.
	In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes. Transaction costs attributable to the liability component were recorded in other assets in the consolidated balance sheets and are being amortized to interest expense in the consolidated statements of operations using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were netted with the equity component of the Notes in additional paid-in capital in the consolidated balance sheets. We recorded liability issuance costs, or debt issuance costs, of $12,497,000 and equity issuance costs of $2,949,000.
	The Notes consisted of the following as of July 31, 2014 (in thousands):
		Amount
	Liability:
	Principal	$	575,000
	Less: debt discount, net of amortization	108,125
	Net carrying amount	$	466,875
	Equity	$	(109,785	)
	The total estimated fair value of the Notes at July 31, 2014 was $587,087,000. The fair value was determined based on the closing trading price per $100 of the Notes as of the last day of trading for the period. We consider the fair value of the Notes at July 31, 2014 to be a Level 2 measurement. The fair value of the Notes is primarily affected by the trading price of our common stock and market interest rates. Based on the closing price of our common stock of $80.86 on July 31, 2014, the if-converted value of the Notes was less than its principal amount.
	The following table sets forth total interest expense recognized related to the Notes for the year ended July 31, 2014 (in thousands, except for percentage):
		Amount
	Amortization of debt issuance costs	$	166
	Amortization of debt discount	1,660
	Total	$	1,826
	Effective interest rate of the liability component	4.8		%
	Note Hedges
	To minimize the impact of potential economic dilution upon conversion of the Notes, we entered into convertible note hedge transactions (the "Note Hedges") with respect to our common stock concurrent with the issuance of the Notes. The Note Hedges cover up to 5,214,000 shares of our common stock at a strike price per share that corresponds to the initial conversion price of the Notes, which are also subject to adjustment, and are exercisable upon conversion of the Notes. The Note Hedges will expire upon maturity of the Notes. The Note Hedges are separate transactions and are not part of the terms of the Notes. Holders of the Notes will not have any rights with respect to the Note Hedges. The shares receivable related to the Note Hedges are excluded from the calculation of diluted earnings per share as they are anti-dilutive.
	We paid an aggregate amount of $110,975,000 for the Note Hedges, which is included in additional paid-in capital in the consolidated balance sheets.
	Warrants
	Separately, but concurrently with our issuance of the Notes, we entered into warrant transactions (the “Warrants”) whereby we sold warrants to acquire up to 5,214,000 shares of our common stock at a strike price of approximately $137.85 per share, subject to adjustments. The shares issuable under the Warrants will be included in the calculation of diluted earnings per share when the average market value per share of our common stock for the reporting period exceeds the strike price of the Warrants. The Warrants are separate transactions and are not part of the Notes or Notes Hedges, and are not remeasured through earnings each reporting period. Holders of the Notes and Note Hedges will not have any rights with respect to the Warrants.
	We received aggregate proceeds of $78,258,000 from the sale of the Warrants, which is included in additional paid-in capital in the consolidated balance sheets.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Jul. 31, 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.
	In September 2012, we entered into two lease agreements for an aggregate of approximately 300,000 square feet of space in Santa Clara, California to serve as our new corporate headquarters beginning in November 2013. The leases have inception dates of November 2012 and August 2013, expire in July 2023, and allow for two separate 5-year options to extend the lease term. Payments under these leases are approximately $94,321,000 over the lease term. Each lease has a rent holiday, which was included in the determination of rent expense.
	In July 2013, we entered into a 51-month sub-lease agreement for our current corporate headquarters with a lease inception date of January 2014. Net proceeds from this sub-lease is approximately $10,696,000 over the lease term. The sub-lease agreement contains a rent credit of $528,000, which was included in the determination of rental income.
	We recognized rent expense of $13,207,000, $4,356,000, and $2,258,000 for the years ended July 31, 2014, 2013, and 2012, respectively. Rent expense is recognized using the straight-line method over the term of the lease.
	The following table presents details of the aggregate future non-cancelable minimum rental payments on our operating leases as of July 31, 2014 (in thousands):
		Amount
	Years ending July 31:
	2015	$	14,170
	2016	14,279
	2017	13,187
	2018	11,774
	2019	9,697
	2020 and thereafter	42,603
	Committed gross lease payments	105,710
	Less: proceeds from sublease rental	10,696
	Net operating lease obligation	$	95,014
	Contract Manufacturer Commitments
	Our independent contract manufacturer procures components and assembles our products based on our forecasts. These forecasts are based on estimates of demand for our products primarily for the next twelve months, which are in turn based on historical trends and an analysis from our sales and product marketing organizations, adjusted for overall market conditions. In order to reduce manufacturing lead times and plan for adequate supply, we may issue forecasts and orders for components and products that are non-cancelable. Obligations under contracts that we can cancel without a significant penalty are not included. As of July 31, 2014, we had $29,895,000 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 9. Legal Settlement 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.
	Indemnification
	Under the indemnification provisions of our standard sales related contracts, we agree to defend our end-customers against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. Our exposure under these indemnification provisions is generally limited to the total amount paid by our end-customer under the agreement. However, certain agreements include indemnification provisions that could potentially expose us to losses in excess of the amount received under the agreement. In addition, we indemnify our officers, directors, and certain key employees while they are serving in good faith in their company capacities. To date, there have been no claims under any indemnification provisions.

Legal_Settlement

Legal Settlement	12 Months Ended
	Jul. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Legal Settlement	'
	Legal Settlement
	Settlement, Release and Cross-License Agreement with Juniper
	On May 27, 2014, we entered into a Settlement, Release and Cross-License Agreement (the "settlement 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, which was comprised of $75,000,000 in cash, $75,231,000 in common stock, and $32,242,000 in warrant. The fair values of the common stock and warrant were measured using the closing price of our common stock on the settlement date.
	The warrant was issued on June 3, 2014 and entitled Juniper to purchase up to 463,000 shares of common stock at an exercise price of $0.0001 per share and was classified as a liability during the period it was outstanding. On July 1, 2014, Juniper exercised the warrant in full. Accordingly, we recorded the change in the fair value of the warrant liability through the exercise date of $5,859,000 within other income (expense), net in the consolidated statement of operations for the year ended July 31, 2014.
	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 mutual covenant not to sue have no identifiable future benefit, and as a result we recorded a settlement charge within operating expenses in the consolidated statements of operations for the year ended July 31, 2014. The licensing of intellectual property is being amortized over the estimated period of benefit of five years.
	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. (“Fortinet”), 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 in the consolidated statements of operatiions for the year ended July 31, 2014.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Jul. 31, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders’ Equity	'
	Stockholders’ Equity
	In July 2012, we completed our initial public offering (IPO) whereby 6,200,000 shares of common stock were sold to the public at a price of $42.00 per share. We sold 4,687,000 common shares and selling stockholders sold 1,513,000 common shares. In connection with the exercise of the underwriters’ over-allotment option, 930,000 additional shares of common stock were sold to the public at the initial offering price of $42.00 per share. We received aggregate proceeds of $219,400,000 from the initial public offering and the underwriters’ over-allotment option, net of underwriters’ discounts and commissions, but before deducting offering expenses of approximately $4,000,000. Proceeds from our initial public offering are presented net of offering costs in the consolidated financial statements. Upon the closing of the initial public offering, all shares of our outstanding redeemable convertible preferred stock automatically converted into 41,305,000 shares of common stock.
	In October 2012, we completed our secondary offering whereby certain stockholders of our company sold 4,800,000 shares of common stock to the public at a price of $63.00 per share. The aggregate offering price for shares sold in the offering was approximately $290,304,000, net of underwriting discounts and commissions. We did not receive any proceeds from the sale of shares in this offering. Offering expenses were paid by the stockholders who sold shares of common stock in the offering.

Equity_Award_Plans

Equity Award Plans	12 Months Ended
	Jul. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity Award Plans	'
	Equity Award Plans
	Share-Based Compensation Plans
	2012 Equity Incentive Plan
	Our 2012 Equity Incentive Plan (the "2012 Plan") was adopted by our board of directors and approved by the stockholders on June 5, 2012 and was effective one business day prior to the effectiveness of our registration statement for our initial public offering. The 2012 Plan replaced our 2005 Equity Incentive Plan (the “2005 Plan”). Our 2012 Plan provides for the granting of stock options, restricted stock awards, RSUs, stock appreciation rights, performance units, and performance shares to our employees, directors, and consultants.
	Awards granted under our 2012 Plan vest over the periods determined by the board of directors, generally four years, and expire no more than ten years after the date of grant. In the case of an incentive stock option granted to an employee, who at the time of grant, owns stock representing more than 10% of the total combined voting power of all classes of stock, the exercise price shall be no less than 110% of the fair value per share on the date of grant, and expire five years from the date of grant, and for options granted to any other employee, the per share exercise price shall be no less than 100% of the fair value per share on the date of grant. In the case of a non-statutory stock option and options granted to consultants, the per share exercise price shall be no less than 100% of the fair value per share on the date of grant. Stock that is purchased prior to vesting is subject to our right of repurchase at any time following termination of the participant.
	RSUs generally vest over a period of three to four years from the date of grant. Until vested, RSUs do not have the voting and dividend participation rights of common stock and the shares underlying the awards are not considered issued and outstanding.
	A total of 19,941,000 shares of our common stock are reserved for issuance pursuant to the 2012 Plan and includes shares that are (i) reserved but unissued under the 2005 Plan on the effective date of the 2012 Plan or (ii) returned to our 2005 Plan as a result of expiration or termination of options. On the first day of each fiscal year, starting with August 1, 2013, the number of shares in the reserve may be increased by the lesser of (i) 8,000,000 shares, (ii) 4.5% of the outstanding shares of common stock on the last day of our immediately preceding fiscal year, or (iii) such other amount as determined by our board of directors.
	2012 Employee Stock Purchase Plan
	Our 2012 Employee Stock Purchase Plan (the "2012 ESPP") was adopted by our board of directors and approved by the stockholders on June 5, 2012 and was effective upon completion of our initial public offering.
	The 2012 ESPP permits eligible employees to acquire shares of our common stock at 85% of the lower of the fair market value of our common stock on the first trading day of each offering period or on the exercise date. Each offering period will be approximately six months starting on the first trading date on or after March 15 and September 15 of each year, except for the first offering period, which commenced on July 19, 2012 and ended on March 15, 2013. Participants may purchase shares of common stock through payroll deductions of up to 15% of their eligible compensation, subject to purchase limits of 625 shares during a six month period or $25,000 worth of stock for each calendar year.
	A total of 1,227,000 shares of our common stock are available for sale under the 2012 ESPP as of July 31, 2014. On the first day of each fiscal year, starting with August 1, 2013, the number of shares in the reserve may be increased by the lesser of (i) 2,000,000 shares, (ii) 1% of the outstanding shares of our common stock on the first day of the fiscal year, or (iii) such other amount as determined by our board of directors.
	2005 Plan
	Our 2005 Plan was terminated upon the completion of our initial public offering. Awards that were outstanding upon termination remained outstanding pursuant to their original terms.
	Stock Option Activities
	A summary of the activity under our stock plans during the reporting period and a summary of information related to options exercisable, vested, and expected to vest are presented below (in 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	(558	)		14.62
	Options exercised	(3,645	)		9.25
	Balance—July 31, 2014	5,830			13.02			7		$	395,507
	Options vested and expected to vest—July 31, 2014	5,698			$	12.92		7		$	387,122
	Options exercisable—July 31, 2014	3,412			$	10.51		6.8		$	240,034
	The weighted-average grant-date fair value of employee options granted during the years ended July 31, 2014, 2013, and 2012 was nil, $26.09, and $8.17, respectively. The intrinsic value of employee options exercised during the years ended July 31, 2014, 2013, and 2012 was $198,828,000, $186,845,000, and $20,334,000, respectively. The grant-date fair value of employee options vested during the years ended July 31, 2014, 2013, and 2012 was $17,137,000, $21,351,000, and $6,960,000, respectively.
	RSU Activities
	A summary of the activity under our stock plans during the reporting period and a summary of information related to RSUs vested and expected to vest are presented below (in 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	5,154			61
	RSUs vested	(870	)		55.03
	RSUs forfeited	(479	)		55.42
	Balance—July 31, 2014	6,046			$	59.84		1.4		$	488,880
	RSUs vested and expected to vest—July 31, 2014	5,473			$	59.65		1.3		$	442,547
	The weighted-average grant-date fair value of employee RSUs granted during the years ended July 31, 2014, 2013, and 2012 was $61.00, $54.51, and nil, respectively. The aggregate fair value, as of the respective vesting dates, of RSUs vested during the years ended July 31, 2014, 2013, and 2012 was $57,431,000, $272,000, and nil, respectively.
	Shares Available for Grant
	The following table presents the stock activity and the total number of shares available for grant as of July 31, 2014 (in thousands):
		Number of shares
	Balance at beginning of fiscal year	8,932
	Authorized	3,223
	RSUs granted	(5,154	)
	Repurchased	28
	Options forfeited	558
	RSUs forfeited	479
	Balance at end of fiscal year	8,066
	Employee Stock Purchase Plan
	We recognized compensation expense of $4,473,000, $5,263,000, and $172,000 in connection with the 2012 ESPP during the years ended July 31, 2014, 2013, and 2012, respectively. Employees purchased approximately 319,000 shares of common stock at an average exercise price of $40.36 per share during the year ended July 31, 2014.
	Share-Based Compensation
	We record share-based compensation awards based on fair value as of the grant date. For option awards and Employee Stock Purchase Plan (ESPP) purchases we use the Black-Scholes option-pricing model to determine fair value. We recognize such costs as compensation expense on a straight-line basis over the employee’s requisite service period. The assumptions for our option-pricing model are determined as follows:
	Fair Value of Common Stock
	Prior to our initial public offering, our board of directors considered numerous objective and subjective factors to determine the fair value of our common stock at each meeting at which awards were approved. These factors included, but were not limited to (i) contemporaneous third-party valuations of common stock; (ii) the rights and preferences of convertible preferred stock relative to common stock; (iii) the lack of marketability of common stock; (iv) developments in the business; and (v) the likelihood of achieving a liquidity event, such as an initial public offering or sale of the Company, given prevailing market conditions.
	Risk-Free Interest Rate
	We base the risk-free interest rate used in the Black-Scholes valuation model on the implied yield available on U.S. Treasury zero-coupon issues with an equivalent remaining term of the options for each option group.
	Expected Term
The expected term represents the period that our share-based awards are expected to be outstanding. We determined the expected term assumption based on the contractual term of the awards adjusted for estimates of our employees' expected exercise and expected post-vesting termination behavior.
Volatility
We determine the price volatility factor based on the historical volatilities of our peer group as we do not have sufficient trading history for our common stock.
Dividend Yield
The expected dividend assumption is based on our current expectations about our anticipated dividend policy.
The following table summarizes the assumptions relating to our stock options:
	Year Ended July 31,
	2013		2012
Risk-free interest rate	1.00%		0.7% - 1.1%
Expected term	6 years		4 – 6 years
Volatility	50%		49% – 51%
Dividend yield	—%		—%
The following table summarizes the assumptions related to the 2012 ESPP:
	Year Ended July 31,
	2014		2013		2012
Risk-free interest rate	0.10%		0.10%		0.10%
Expected term	< 1 year		< 1 year		< 1 year
Volatility	40%		42%		46%
Dividend yield	—%		—%		—%
The following table summarizes share-based compensation included in costs and expenses (in thousands):
	Year Ended July 31,
	2014				2013			2012
Cost of revenue	$	11,070			$	4,351		$	774
Research and development	29,524				9,931			3,733
Sales and marketing	42,647				20,493			4,267
General and administrative	16,668				9,101			5,151
Total	$	99,909			$	43,876		$	13,925
At July 31, 2014, total compensation cost related to unvested share-based awards granted to employees but not yet recognized was $320,805,000, 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.
For fiscal 2014, we accelerated the vesting of certain share-based awards in connection with our acquisitions of Morta and Cyvera and as a result, we recorded $3,446,000 of compensation expense within general and administrative expense.
For fiscal 2013, we modified the terms of certain share-based awards for a former employee and as a result, we recorded $1,861,000 of compensation expense within sales and marketing expense.
For fiscal 2012, we modified the terms of certain share-based awards for a former employee and as a result, we recorded $854,000 of compensation expense within research and development expense.

Income_Taxes

Income Taxes	12 Months Ended
	Jul. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The following table presents the components of income (loss) before income taxes (in thousands):
		Year Ended July 31,
		2014				2013				2012
	United States	$	(149,243	)		$	5,198			$	1,646
	Foreign	(72,917		)		(23,854		)		1,153
	Total	$	(222,160	)		$	(18,656	)		$	2,799
	The following table summarizes the provision for income taxes (in thousands):
		Year Ended July 31,
		2014				2013				2012
	Federal:
	Current	$	795			$	5,883			$	525
	Deferred	—				—				—
	State:
	Current	230				1,758				647
	Deferred	(324		)		—				—
	Foreign:
	Current	4,679				3,296				861
	Deferred	(1,088		)		(347		)		29
	Total	$	4,292			$	10,590			$	2,062
	The following table presents the items accounting for the difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes:
		Year Ended July 31,
		2014			2013			2012
	Federal statutory rate	35	%		35	%		34	%
	Effect of:
	State taxes, net of federal tax benefit	1.3			1			9.7
	Change in valuation allowance	(20.0	)		(7.3	)		(85.4	)
	Foreign income at other than U.S. rates	(12.1	)		(62.4	)		17.2
	Share-based compensation	(3.2	)		(16.1	)		66.6
	Preferred stock warrant liability	—			—			12.3
	Meals and entertainment	(0.3	)		(2.0	)		11.9
	Other, net	(2.6	)		(5.0	)		7.4
	Total	(1.9	)%		(56.8	)%		73.7	%
	The following table presents the components of our deferred tax assets and liabilities as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31,
		2014				2013
	Deferred tax assets:
	Accruals and reserves	$	38,372			$	23,461
	Research and development and foreign tax credits	8,741				4,702
	Net operating loss carryforwards	32,282				2,170
	Share-based compensation	17,715				10,619
	Gross deferred tax assets	97,110				40,952
	Valuation allowance	(89,309		)		(37,659		)
	Total deferred tax assets	7,801				3,293
	Deferred tax liabilities:
	Fixed assets and intangible assets	(15,040		)		(2,937		)
	Other deferred tax liabilities	(565		)		—
	Total deferred tax liabilities	(15,605		)		(2,937		)
	Total	$	(7,804	)		$	356
	A valuation allowance is provided when it is more likely than not that the deferred tax asset will not be realized. Realization of deferred tax assets is dependent upon future taxable income, if any, the amount and timing of which are uncertain. At such time, if it is determined that it is more likely than not that the deferred tax assets are realizable, the valuation allowance will be adjusted. As of July 31, 2014, we have provided a valuation allowance for our federal, state, and certain foreign deferred tax assets that we believe will, more likely than not, be unrealizable. The net valuation allowance increased by approximately $51,650,000 during fiscal 2014, which was primarily attributable to taxable losses in our federal and state jurisdictions.
	As of July 31, 2014, we had federal, state, and foreign NOL carryforwards of approximately $330,428,000, $233,973,000, and $16,038,000, respectively as reported on our tax returns, available to reduce future taxable income, if any. If not utilized, our federal and state NOL carryforwards will expire in various amounts from the years ending July 31, 2027 through 2034 and July 31, 2017 through 2034, respectively. If not utilized, a portion of our foreign NOL carryforwards will expire in the year ending July 31, 2023. The remainder of our foreign NOL will carry forward indefinitely.
	As of July 31, 2014, we had federal and state research and development tax credit carryforwards of approximately $9,563,000 and $11,565,000, respectively as reported on our tax returns. If not utilized, the federal credit carryforwards will expire in various amounts from the years ending July 31, 2026 through 2034. The state credit will carry forward indefinitely.
	As of July 31, 2014, we had foreign tax credit carryforwards of $816,000 as reported on our tax returns. If not utilized, the foreign tax credit carryforwards will expire in various amounts from the years ending July 31, 2020 through 2024.
	Utilization of the NOL carryforwards and credits may be subject to a substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of NOLs and credits before utilization.
	We use the with-and-without approach to determine the recognition and measurement of excess tax benefits resulting from share-based awards. Accordingly, we have elected to recognize excess income tax benefits from share-based awards in additional paid-in capital only if an incremental income tax benefit would be realized after considering all other tax attributes presently available to us. As of July 31, 2014, we had excess tax benefits from share-based awards of $257,674,000, $149,759,000, and $5,786,000 included in federal, state, and foreign NOL, respectively. We also had $5,289,000 of excess tax benefits from share-based awards included in federal research and development tax credit. The impact of this excess tax benefit is recognized as additional paid-in capital when it reduces taxes payable. In addition, we have elected to account for the indirect effects of share-based awards on other tax attributes, such as the research, foreign and other tax credits, through the consolidated statements of operations.
	During the years ended July 31, 2014, 2013, and 2012, we recorded excess tax benefits that resulted from allocating certain tax effects related to exercises of stock options and vesting of RSUs directly to stockholders’ equity in the amount of $957,000, $6,762,000, and $215,000, respectively.
	As of July 31, 2014, we had $10,385,000 of unrecognized tax benefits, $3,878,000 of which would affect income tax expense if recognized, after consideration of our valuation allowance in the U.S. As of July 31, 2014, our federal, state, and foreign returns for the tax years 2008 through the current period remain open to examination by the major jurisdictions in which we are subject to tax. Fiscal years outside the normal statute of limitation remain open to audit by tax authorities due to tax attributes generated in earlier years which have been carried forward and may be audited in subsequent years when utilized. We do not expect the unrecognized tax benefits to change significantly over the next 12 months. We recognize both interest and penalties associated with uncertain tax positions as a component of income tax expense. During the years ended July 31, 2014, 2013, and 2012, we recognized interest and penalties of $336,000, $222,000, and $72,000, respectively. We had accrued interest and penalties related to unrecognized tax benefits of $630,000 and $294,000 as of July 31, 2014 and 2013, respectively. The ultimate amount and timing of any future cash settlements cannot be predicted with reasonable certainty.
	The following table presents a reconciliation of the beginning and ending amount of gross unrecognized tax benefits (in thousands):
		Year Ended July 31,
		2014				2013				2012
	Unrecognized tax benefits at the beginning of the period	$	6,561			$	2,630			$	1,972
	Additions for tax positions taken in prior years	428				585				9
	Reductions for tax positions taken in prior years	—				(3		)		—
Additions for tax positions related to the current year	3,396				3,349				649
Settlements	—				—				—
Lapse of statute of limitations	—				—				—
Unrecognized tax benefits at the end of the period	$	10,385			$	6,561			$	2,630
As of July 31, 2014, we had approximately $3,810,000 of undistributed earnings in foreign subsidiaries. We expect to permanently reinvest these earnings outside of the U.S. to fund future foreign operations. We project that we will have sufficient cash flow in the U.S. and will not need to repatriate the foreign earnings to finance our domestic operations. If we were to distribute these earnings to the U.S., we would be subject to U.S. income taxes, an adjustment for foreign tax credits, and foreign withholding taxes. We have not recorded a deferred tax liability on any portion of our undistributed earnings in foreign subsidiaries. If we were to repatriate these earnings to the U.S., any associated income tax liability would be insignificant.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	12 Months Ended
	Jul. 31, 2014
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. Immediately prior to the completion of our initial public offering on July 19, 2012, all shares of outstanding redeemable convertible preferred stock were automatically converted to common stock. Prior to their conversion, we considered all series of our redeemable convertible preferred stock to be participating securities as the holders were entitled to participate in common stock dividends with common stock on an as-converted basis. The holders of our redeemable convertible preferred stock were also entitled to non-cumulative dividends prior and in preference to common stock and did not have a contractual obligation to share in the losses of the Company. Additionally, 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):
		Year Ended July 31,
		2014				2013			2012
	Net income (loss) used to compute net income (loss) per share:
	Net income (loss)	$	(226,452	)		$	(29,246	)	$	737
	Less: undistributed earnings allocated to participating securities	—				—			(737		)
	Net income (loss) attributable to common stockholders, basic and diluted	$	(226,452	)		$	(29,246	)	$	—
	Weighted-average shares used to compute net income (loss) per share attributable to common stockholders:
	Weighted-average shares used to compute net income (loss) per share attributable to common stockholders, basic and diluted	74,291				68,682			19,569
	Net income (loss) per share attributable to common stockholders, basic and diluted	$	(3.05	)		$	(0.43	)	$	0
	The following securities were excluded from the computation of diluted net income (loss) per common share applicable to common stockholders for the periods presented as their effect would have been antidilutive (in thousands):
		Year Ended July 31,
		2014			2013			2012
	Options	5,830			10,033			4,116
	RSUs	6,046			2,241			—
	ESPP shares	95			114			—
	Convertible senior notes	5,214			—			—
	Warrants related to the issuance of convertible senior notes	5,214			—			—

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
	Jul. 31, 2014
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plan	'
	Employee Benefit Plan
	We have established a 401(k) tax-deferred savings plan which permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. We are responsible for administrative costs of the plan and have made no contributions to the plan since inception.

Segment_Information

Segment Information	12 Months Ended
	Jul. 31, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	We conduct business globally and are primarily managed on a geographic theater basis. Our chief operating decision maker reviews financial information presented on a consolidated basis accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. We have one business activity and there are no segment managers who are held accountable for operations, operating results, and plans for levels, components, or types of products or services below the consolidated unit level. Accordingly, we are considered to be in a single reportable segment and operating unit structure.
	The following table presents revenue by geographic theater based on the billing address of the partner (in thousands):
		Year Ended July 31,
		2014		2013		2012
	Revenue:
	Americas
	United States	$	363,174	$	228,604	$	151,435
	Other Americas	33,452		19,012		10,438
	Total Americas	396,626		247,616		161,873
	EMEA	126,915		91,496		61,994
	APAC	74,638		56,995		31,271
	Total revenue	$	598,179	$	396,107	$	255,138
	The following table presents revenue for groups of similar product and services (in thousands):
		Year Ended July 31,
		2014		2013		2012
	Revenue:
	Product	$	340,143	$	243,707	$	174,462
	Services
	Subscription	123,236		71,203		38,698
	Support and maintenance	134,800		81,197		41,978
	Total services	258,036		152,400		80,676
	Total revenue	$	598,179	$	396,107	$	255,138
	Substantially all of our assets were attributable to the Americas operations as of July 31, 2014 and 2013.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Jul. 31, 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 recognized revenue from sales transactions with significant related party customers of $6,173,000 and $2,623,000 for the years ended July 31, 2014 and 2013, respectively. We did not have any material sales transactions with related party customers in the year ended July 31, 2012. Amounts payable to and due from related party customers were not material at July 31, 2014.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Jul. 31, 2014
Quarterly Financial Information Disclosure [Abstract]	'
Selected Quarterly Financial Data (Unaudited)	'
	Selected Quarterly Financial Data (Unaudited)
	The following tables set forth selected unaudited financial data for the years ended July 31, 2014 and 2013 (in thousands, except per share amounts):
		Three Months Ended
		Oct. 31,			Jan. 31,			Apr. 30,			Jul. 31,
		2013			2014			2014			2014
	Revenue:
	Product	$	75,485		$	80,823		$	84,128		$	99,707
	Services	52,695			60,245			66,572			78,524
	Total revenue	128,180			141,068			150,700			178,231
	Cost of revenue:
	Product	17,954			20,221			20,425			26,903
	Services	15,853			17,283			19,285			21,704
	Total cost of revenue	33,807			37,504			39,710			48,607
	Total gross profit	94,373			103,564			110,990			129,624
	Operating expenses:
	Research and development	19,893			24,253			27,837			32,830
	Sales and marketing	67,366			76,734			83,995			106,668
	General and administrative	14,125			19,733			23,717			15,574
	Legal settlement (Note 9)	—			20,000			121,173			—
	Total operating expenses	101,384			140,720			256,722			155,072
	Operating loss	(7,011		)	(37,156		)	(145,732		)	(25,448		)
	Interest expense	(8		)	(14		)	(13		)	(1,848		)
	Other income (expense), net	405			(170		)	430			(5,595		)
	Loss before income taxes	(6,614		)	(37,340		)	(145,315		)	(32,891		)
	Provision for (benefit from) income taxes	1,247			2,606			1,272			(833		)
	Net loss	$	(7,861	)	$	(39,946	)	$	(146,587	)	$	(32,058	)
	Net loss per share, basic and diluted	$	(0.11	)	$	(0.55	)	$	(1.96	)	$	(0.41	)
		Three Months Ended
		Oct. 31,			Jan. 31,			Apr. 30,			Jul. 31,
		2012			2013			2013			2013
	Revenue:
	Product	$	55,514		$	61,944		$	60,793		$	65,456
	Services	30,420			34,555			40,496			46,929
	Total revenue	85,934			96,499			101,289			112,385
	Cost of revenue:
	Product	14,416			16,636			15,855			16,505
	Services	9,774			10,982			11,835			13,753
	Total cost of revenue	24,190			27,618			27,690			30,258
	Total gross profit	61,744			68,881			73,599			82,127
	Operating expenses:
	Research and development	13,312			15,495			16,048			17,627
	Sales and marketing	42,607			45,796			51,733			59,635
	General and administrative	8,956			9,747			12,268			11,748
	Total operating expenses	64,875			71,038			80,049			89,010
	Operating loss	(3,131		)	(2,157		)	(6,450		)	(6,883		)
	Interest expense	(40		)	(7		)	(18		)	(9		)
	Other income (expense), net	(32		)	63			(6		)	14
	Loss before income taxes	(3,203		)	(2,101		)	(6,474		)	(6,878		)
	Provision for income taxes	312			512			808			8,958
	Net loss	$	(3,515	)	$	(2,613	)	$	(7,282	)	$	(15,836	)
	Net loss per share, basic and diluted	$	(0.05	)	$	(0.04	)	$	(0.10	)	$	(0.22	)

Description_of_Business_and_Su1

Description of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jul. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Description of Business	'
	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 organizations by safely enabling the increasingly complex and rapidly growing number of applications running on their networks and by preventing breaches stemming from targeted cyber attacks.
	Our enterprise security platform consists of three major elements: our Next-Generation Firewall, our Advanced Endpoint Protection, and our 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 Advanced Endpoint Protection, which we expect to release in fiscal 2015, prevents cyber attacks that aim to exploit software vulnerabilities on a broad variety of fixed and virtual endpoints. Our Threat Intelligence Cloud provides central intelligence capabilities as well as automated delivery of preventative measures against cyber attacks. The cloud-based element of our platform is delivered in the form of a service that can be used either in the public cloud or in a private cloud using a dedicated appliance.
	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	'
	Basis of Presentation
	The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles. The consolidated financial statements include all adjustments necessary for a fair presentation of our annual results. All adjustments are of a normal recurring nature. Certain prior period amounts have been reclassified to conform with current period presentation.
Principles of Consolidation	'
	Principles of Consolidation
	The consolidated financial statements include our accounts and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	'
	Use of Estimates
	The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Such management estimates include the best estimate of selling price for our products and services, share-based compensation, fair value of assets acquired and liabilities assumed in business combinations, the assessment of recoverability of our property and equipment, identified intangibles and goodwill, future taxable income, contract manufacturer liabilities, and loss contingencies. We base our estimates on historical experience and also on assumptions that we believe are reasonable. Actual results could differ materially from those estimates.
Concentrations	'
	Concentrations
	Financial instruments that subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments, and accounts receivable. We invest only in high-quality credit instruments and maintain our cash and cash equivalents and available-for-sale investments in fixed income securities. Management believes that the financial institutions that hold our investments are financially sound and, accordingly, are subject to minimal credit risk. Deposits held with banks may exceed the amount of insurance provided on such deposits.
	Our accounts receivables are primarily derived from our channel partners representing various geographical locations. We perform ongoing credit evaluations of our channel partners and generally do not require collateral on accounts receivable. We maintain an allowance for doubtful accounts for estimated potential credit losses. As of July 31, 2014, three partners represented 36%, 24%, and 13% of our gross accounts receivable. For fiscal 2014, three partners represented 32%, 25%, and 13% of our total revenue. We rely on an independent contract manufacturer to assemble most of our products and sole suppliers for a certain number of our components.
Comprehensive Income (Loss)	'
	Comprehensive Income (Loss)
	Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). Unrealized gains and losses on available-for-sale investments are included in our other comprehensive income or loss.
Foreign Currency Transactions	'
	Foreign Currency Transactions
	The functional currency of our foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities denominated in foreign currencies have been remeasured into U.S. dollars using the exchange rates in effect at the balance sheet dates. Foreign currency denominated income and expenses have been remeasured using the average exchange rates in effect during each period. Foreign currency remeasurement gains and losses and foreign currency transaction gains and losses are not significant to the financial statements.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	We consider all highly liquid investments held at financial institutions, such as commercial paper, money market funds, and other money market securities with original maturities of three months or less at date of purchase to be cash equivalents.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	We define fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, we consider the principal or most advantageous market in which to transact and the market-based risk. We apply fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. The carrying amounts reported in the consolidated financial statements approximate the fair value for cash and cash equivalents, accounts receivable, accounts payable, and accrued liabilities, due to their short-term nature.
Investments	'
	Investments
	We classify our investments as available-for-sale at the time of purchase since it is our intent that these investments are available for current operations, and include these investments on our balance sheet as either short-term or long-term investments depending on their maturity. Investments not considered cash equivalents and with maturities one year or less from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments.
	Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. We consult with our investment managers and consider available quantitative and qualitative evidence in evaluating potential impairment of our investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, we evaluate, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and our intent and ability to hold the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.
Accounts Receivable	'
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on our assessment of the collectability of accounts. Management regularly reviews the adequacy of the allowance for doubtful accounts by considering the age of each outstanding invoice, each partner’s expected ability to pay, and the collection history with each partner, when applicable, to determine whether a specific allowance is appropriate. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified. As of July 31, 2014 and 2013, the allowance for doubtful accounts activity was not significant.
Property and Equipment	'
	Property and Equipment
	Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, generally three to ten years. Leasehold improvements are depreciated over the shorter of the estimated useful lives of the improvements or the remaining lease term.
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.
Impairment of Goodwill, Intangible Assets, and Long-Lived Assets	'
	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.
	Through July 31, 2014, we have not recognized any impairment losses on our goodwill, intangible assets, and long-lived assets.
Contract Manufacturer Liabilities	'
	Contract Manufacturer Liabilities
	We outsource most of our manufacturing, repair, and supply chain management operations to our independent contract manufacturer and payments to it are a significant portion of our product cost of revenues. Although we could be contractually obligated to purchase manufactured products, we generally do not own the manufactured products. Product title transfers from our independent contract manufacturer to us and immediately to our partners upon shipment. Our independent contract manufacturer assembles our products using design specifications, quality assurance programs, and standards that we establish and it procures components and assembles our products based on our demand forecasts. These forecasts represent our estimates of future demand for our products based upon historical trends and analysis from our sales and product management functions as adjusted for overall market conditions. If the actual component usage and product demand are significantly lower than forecast, we accrue for costs for contractual manufacturing commitments in excess of our forecasted demand including costs for excess components or for carrying costs incurred by our contract manufacturer. Through July 31, 2014, we have not accrued any significant costs associated with this exposure.
Convertible Senior Notes	'
	Convertible Senior Notes
	On June 30, 2014, we issued $575,000,000 aggregate principal amount of 0.0% convertible senior notes due 2019 (the "Notes"). In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. This difference represents a debt discount that is amortized to interest expense using the effective interest method over the term of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes. Transaction costs attributable to the liability component are being amortized to interest expense using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were netted with the equity component of the Notes in additional paid-in capital in the consolidated balance sheets.
Revenue Recognition	'
	Revenue Recognition
	We generate revenue from the sales of hardware and software products, subscriptions, support and maintenance, and other services primarily through a direct sales force and indirect relationships with our partners.
	Revenue is recognized when all of the following criteria are met:
	•	Persuasive Evidence of an Arrangement Exists. We rely upon non-cancelable sales agreements and purchase orders to determine the existence of an arrangement.
	•	Delivery has Occurred. We use shipping documents or transmissions of product or service contract registration codes to determine delivery.
	•	The Fee is Fixed or Determinable. We assess whether the fee is fixed or determinable based on the payment terms associated with the transaction.
	•	Collectability is Reasonably Assured. We assess collectability based on credit analysis and payment history.
	We recognize product revenue at the time of shipment provided that all other revenue recognition criteria have been met. Our partners generally receive an order from an end-customer prior to placing an order with us. In addition, payment from our partners is not contingent on the partner’s success in sales to end-customers. Our partners generally do not stock appliances and only have limited stock rotation rights and no price protection rights. When necessary, we make certain estimates and maintain allowances for sales returns and other programs based on our historical experience. To date, these estimates have not been significant. We recognize services revenue from subscriptions and support and maintenance ratably over the contractual service period, which is typically one to five years. Other services revenue is recognized as the services are rendered and has not been significant to date.
	Most of our arrangements, other than renewals of subscriptions and support and maintenance, are multiple-element arrangements with a combination of hardware, software, subscriptions, support and maintenance, and other services. Products and services generally qualify as separate units of accounting. Our hardware deliverables typically include proprietary operating system software, which together deliver the essential functionality of our products. For multiple-element arrangements, we allocate revenue to each unit of accounting based on an estimated selling price at the arrangement inception. The estimated selling price for each element is based upon the following hierarchy: vendor-specific objective evidence (VSOE) of selling price, if available, third-party evidence (TPE) of selling price, if VSOE of selling price is not available, or best estimate of selling price (BESP), if neither VSOE of selling price nor TPE of selling price are available. The total arrangement consideration is allocated to each separate unit of accounting using the relative estimated selling prices of each unit based on the aforementioned selling price hierarchy. We limit the amount of revenue recognized for delivered elements to an amount that is not contingent upon future delivery of additional products or services or meeting of any specified performance conditions.
	To determine the estimated selling price in multiple-element arrangements, we establish VSOE of selling price using the prices charged for a deliverable when sold separately. If VSOE of selling price cannot be established for a deliverable, we establish TPE of selling price by evaluating similar and interchangeable competitor products or services in standalone arrangements with similarly situated partners. However, as our products contain a significant element of proprietary technology and offer substantially different features and functionality from our competitors, we are unable to obtain comparable pricing of our competitors’ products with similar functionality on a standalone basis. Therefore, we have not been able to obtain reliable evidence of TPE of selling price. If neither VSOE nor TPE of selling price can be established for a deliverable, we establish BESP primarily based on historical transaction pricing. Historical transactions are segregated based on our pricing model and our go-to-market strategy, which include factors such as type of sales channel (reseller, distributor, or end-customer), the geographies in which our products and services were sold (domestic or international), offering type (products or services), and whether or not the opportunity was identified by our sales force or by our partners. In analyzing historical transaction pricing we evaluate whether a majority of the prices charged for a product or service, as represented by a percentage of list price, fall within a reasonable range. To further support the best estimate of selling price as determined by the historical transaction pricing or when such information is unavailable, such as when there are limited sales of a new product or service, we consider the same factors we have established through our pricing model and go-to-market strategy. The determination of BESP is made through consultation with and approval by our management.
	In multiple-element arrangements where software deliverables are included, revenue is allocated to each separate unit of accounting for each of the non-software deliverables and to the software deliverables as a group using the relative estimated selling prices of each of the deliverables in the arrangement based on the aforementioned estimated selling price hierarchy. The arrangement consideration allocated to the software deliverables as a group is then allocated to each software deliverable using the residual method when VSOE of fair value of the undelivered items exists. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration less the aggregate fair value of any undelivered elements. In determining VSOE of fair value, we evaluate whether a substantial majority of the historical prices charged for a product or service sold on a standalone basis, as represented by a percentage of list price, fall within a reasonably narrow range. If VSOE of fair value of one or more undelivered items does not exist, revenue from the entire arrangement is deferred and recognized at the earlier of: (i) delivery of those elements or (ii) when fair value can be established unless support and maintenance is the only undelivered element, in which case, the entire arrangement fee is recognized ratably over the contractual service period.
	We account for multiple agreements with a single partner as one arrangement if the contractual terms and/or substance of those agreements indicate that they may be so closely related that they are, in effect, parts of a single arrangement.
	Revenues are reported net of sales taxes. Shipping charges billed to partners are included in revenues and related costs are included in cost of revenue. Sales commissions and other incremental costs to acquire contracts are also expensed as incurred. After receipt of a partner order, any amounts billed in excess of revenue recognized are recorded as deferred revenue.
Advertising Costs	'
	Advertising Costs
	Advertising costs, which are expensed and included in sales and marketing expense when incurred, were $3,693,000, $1,808,000, and $1,604,000, during the years ended July 31, 2014, 2013, and 2012, respectively.
Software Development Costs	'
	Software Development Costs
	Internally developed software includes enterprise-level business software that we are customizing to meet our specific operational needs. These capitalized costs consisted of the external direct costs and the internal payroll and payroll related costs that are related to the implementation of our enterprise resource planning software system and will be amortized over a useful life of five years.
	The costs to develop software that is marketed externally have not been capitalized as we believe our current software development process is essentially completed concurrent with the establishment of technological feasibility. As such, all related software development costs are expensed as incurred and included in research and development expense in our consolidated statements of operations.
Share-Based Compensation	'
	Share-Based Compensation
	Compensation expense related to share-based transactions, including employee and non-employee director awards, is measured and recognized in the financial statements based on fair value on the grant date. The fair value of restricted stock units (RSUs) is based on the closing market price of our common stock on the date of grant. The fair value of option awards and purchases under our 2012 Equity Incentive Plan (the “2012 Plan”) and 2012 Employee Stock Purchase Plan (the “2012 ESPP”) is estimated using the Black-Scholes option-pricing model. This model requires the input of the fair value of our common stock and that at the date of grant we determine the expected term of the award, the expected volatility of the price of our common stock, risk-free interest rates, and expected dividend yield of our common stock. The share-based compensation expense, net of forfeitures, is recognized using a straight-line basis over the requisite service periods of the awards. We estimate a forfeiture rate to calculate the share-based compensation expense for our awards. Our forfeiture rate is based on an analysis of our actual historical forfeitures.
Income Taxes	'
	Income Taxes
	We account for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our financial statements or tax returns. In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carryforwards. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.
	Significant judgment is required in determining any valuation allowance recorded against deferred tax assets. In assessing the need for a valuation allowance, we consider all available evidence, including past operating results, estimates of future taxable income, and the feasibility of tax planning strategies. In the event that we change our determination as to the amount of deferred tax assets that can be realized, we will adjust our valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made.
	We apply the authoritative accounting guidance prescribing a threshold and measurement attribute for the financial recognition and measurement of a tax position taken or expected to be taken in a tax return. We recognize liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step requires us to estimate and measure the tax benefit as the largest amount that is more likely than not to be realized upon ultimate settlement.
Loss Contingencies	'
	Loss Contingencies
	We are subject to the possibility of various loss contingencies arising in the ordinary course of business. We consider the likelihood of loss or impairment of an asset, or the incurrence of a liability, as well as our ability to reasonably estimate the amount of loss, in determining loss contingencies. An estimated loss contingency is accrued when it is probable that an asset has been impaired or a liability has been incurred and the amount of loss can be reasonably estimated. If we determine that a loss is possible and the range of the loss can be reasonably determined, then we disclose the range of the possible loss. We regularly evaluate current information available to us to determine whether an accrual is required, an accrual should be adjusted or a range of possible loss should be disclosed.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09 regarding Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers. The standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance is effective for us in the first quarter of fiscal 2018 using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within the guidance; or (ii) retrospective with the cumulative effect of initially applying the guidance recognized at the date of initial application and providing certain additional disclosures as defined per the guidance. Early adoption is not permitted. We are currently evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.
	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 consolidated financial statements.
	In February 2013, the FASB issued ASU 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 Measurement	'
	Fair Value Measurements
	We categorize assets and liabilities recorded at fair value on our 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)	12 Months Ended
	Jul. 31, 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 as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31, 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	—		—		—		—		—		46,700		—		46,700
	Money market funds	—		—		—		—		131,845		—		—		131,845
	Total cash equivalents	—		—		—		—		133,667		46,700		—		180,367
	Short-term investments:
	Corporate debt securities	—		22,239		—		22,239		—		32,834		—		32,834
	U.S. government and agency securities	—		96,451		—		96,451		—		76,173		—		76,173
	Total short-term investments	—		118,690		—		118,690		—		109,007		—		109,007
	Long-term investments:
	Certificates of deposit	—		1,000		—		1,000		—		—		—		—
	Corporate debt securities	—		39,018		—		39,018		—		12,317		—		12,317
	U.S. government and agency securities	—		161,862		—		161,862		—		4,997		—		4,997
	Total long-term investments	—		201,880		—		201,880		—		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	$	320,570	$	—	$	321,790	$	134,888	$	173,021	$	—	$	307,909

Investments_Tables

Investments (Tables)	12 Months Ended
	Jul. 31, 2014
Investments, Debt and Equity Securities [Abstract]	'
Schedule of available-for-sale investments	'
	The following table summarizes the unrealized gains and losses and fair value of our investments as of July 31, 2014 and July 31, 2013 (in thousands):
		31-Jul-14
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
	Certificates of deposit	$	1,000	$	—		$	—		$	1,000
	Corporate debt securities	61,299		16			(58		)	61,257
	U.S. government and agency securities	258,376		45			(108		)	258,313
	Total	$	320,675	$	61		$	(166	)	$	320,570
		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 table presents our investments that were in an unrealized loss position as of July 31, 2014 and July 31, 2013 (in thousands):
		31-Jul-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	$	43,868	$	(58	)	$	—		$	—	$	43,868	$	(58	)
	U.S. government and agency securities	142,490		(108		)	—			—		142,490		(108		)
	Total	$	186,358	$	(166	)	$	—		$	—	$	186,358	$	(166	)
		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 July 31, 2014, by contractual years-to-maturity (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	118,678	$	118,690
	Due within one to two years	193,952		193,853
	Due within two to three years	8,045		8,027
	Total	$	320,675	$	320,570

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Jul. 31, 2014
Cyvera	'
Business Acquisition	'
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 allocation of the purchase consideration based on the estimated fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Cash	$	6,930
	Goodwill	144,906
	Identified intangible assets	42,300
	Accrued and other liabilities, net	(6,950		)
	Long-term deferred tax liability, net	(9,539		)
	Total	$	177,647
	The estimated fair values of assets acquired and liabilities assumed in the table above have been adjusted to reflect a change in our estimated blended state tax rate during the measurement period.
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 years ended July 31, 2014 and 2013, as though the companies were combined as of August 1, 2012 (in thousands):
		Year Ended July 31,
		2014			2013
	Total revenue	$	598,254		$	396,131
	Net loss	$	(241,920	)	$	(43,041	)
Morta	'
Business Acquisition	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes our allocation of the purchase consideration based on the estimated fair value of assets acquired and liabilities assumed (in thousands):
		Amount
	Goodwill	$	10,127
	Identified intangible assets	2,200
	Net liabilities assumed	(1,982		)
	Total	$	10,345
	The estimated fair values of assets acquired and liabilities assumed in the table above have been adjusted to reflect changes in our blended tax rate during the measurement period.
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)	12 Months Ended
	Jul. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	The following table presents details of our goodwill during the year ended July 31, 2014 (in thousands):
		Gross Carrying Amount		Accumulated Impairment Loss			Net Carrying Amount
	Balance as of July 31, 2013	$	—	$	—		$	—
	Goodwill acquired	155,033		—			155,033
	Balance as of July 31, 2014	$	155,033	$	—		$	155,033
Schedule Of Intangible Assets By Major Class	'
	The following tables present details of our purchased intangible assets as of July 31, 2014 and July 31, 2013 (in thousands):
		31-Jul-14
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Intangible assets with finite lives:
	Developed technology	$	34,500	$	(1,643	)	$	32,857
	Acquired intellectual property	6,546		(958		)	5,588
	In-process research and development held for defensive purposes	1,900		(370		)	1,530
	Other	500		(120		)	380
	Total intangible assets with finite lives	43,446		(3,091		)	40,355
	In-process research and development with indefinite lives	7,600		—			7,600
	Total purchased intangible assets	$	51,046	$	(3,091	)	$	47,955
		31-Jul-13
		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Acquired intellectual property	$	1,546	$	(188	)	$	1,358
Future Amortization Expense of Intangible Assets	'
	The following table summarizes our estimated future amortization expense of intangible assets with finite lives by type as of July 31, 2014 (in thousands):
		Fiscal Years Ending July 31,
		2015		2016			2017		2018		2019		2020 and Thereafter
	Developed technology	$	4,928	$	4,928		$	4,928	$	4,928	$	4,928	$	8,217
	Acquired intellectual property	761		704			611		484		399		2,629
	In-process research and development held for defensive purposes	633		633			264		—		—		—
	Other	250		130			—		—		—		—
	Total future amortization expense	$	6,572	$	6,395		$	5,803	$	5,412	$	5,327	$	10,846

Other_Financial_Information_Ta

Other Financial Information (Tables)	12 Months Ended
	Jul. 31, 2014
Balance Sheet Related Disclosures [Abstract]	'
Schedule of property and equipment	'
	The following table presents details of property and equipment, net as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31,
		2014			2013
	Computers, equipment, and software	$	38,147		$	27,239
	Leasehold improvements	21,258			10,176
	Demonstration units	14,832			11,401
	Furniture and fixtures	5,129			2,746
	Total property and equipment	79,366			51,562
	Less: accumulated depreciation	(30,622		)	(19,476		)
	Total property and equipment, net	$	48,744		$	32,086
Schedule of accrued and other liabilities	'
	The following table presents details of accrued and other liabilities as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31,
		2014			2013
	Accrued expenses payable	$	12,210		$	11,144
	Other liabilities	12,790			3,465
	Total accrued and other liabilities	$	25,000		$	14,609

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	12 Months Ended
	Jul. 31, 2014
Debt Disclosure [Abstract]	'
Components of Convertible Senior Notes	'
	The Notes consisted of the following as of July 31, 2014 (in thousands):
		Amount
	Liability:
	Principal	$	575,000
	Less: debt discount, net of amortization	108,125
	Net carrying amount	$	466,875
	Equity	$	(109,785	)
Interest Expense Recognized related to the Notes	'
	The following table sets forth total interest expense recognized related to the Notes for the year ended July 31, 2014 (in thousands, except for percentage):
		Amount
	Amortization of debt issuance costs	$	166
	Amortization of debt discount	1,660
	Total	$	1,826
	Effective interest rate of the liability component	4.8		%

Commitment_and_Contingencies_T

Commitment and Contingencies (Tables)	12 Months Ended
	Jul. 31, 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 July 31, 2014 (in thousands):
		Amount
	Years ending July 31:
	2015	$	14,170
	2016	14,279
	2017	13,187
	2018	11,774
	2019	9,697
	2020 and thereafter	42,603
	Committed gross lease payments	105,710
	Less: proceeds from sublease rental	10,696
	Net operating lease obligation	$	95,014

Equity_Award_Plans_Tables

Equity Award Plans (Tables)	12 Months Ended
	Jul. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Stock Options Activity	'
	A summary of the activity under our stock plans during the reporting period and a summary of information related to options exercisable, vested, and expected to vest are presented below (in 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	(558	)		14.62
	Options exercised	(3,645	)		9.25
	Balance—July 31, 2014	5,830			13.02			7		$	395,507
	Options vested and expected to vest—July 31, 2014	5,698			$	12.92		7		$	387,122
	Options exercisable—July 31, 2014	3,412			$	10.51		6.8		$	240,034
Schedule of Restricted Stock Units Award Activity	'
	A summary of the activity under our stock plans during the reporting period and a summary of information related to RSUs vested and expected to vest are presented below (in 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	5,154			61
	RSUs vested	(870	)		55.03
	RSUs forfeited	(479	)		55.42
	Balance—July 31, 2014	6,046			$	59.84		1.4		$	488,880
	RSUs vested and expected to vest—July 31, 2014	5,473			$	59.65		1.3		$	442,547
Shares Available For Grant	'
	The following table presents the stock activity and the total number of shares available for grant as of July 31, 2014 (in thousands):
		Number of shares
	Balance at beginning of fiscal year	8,932
	Authorized	3,223
	RSUs granted	(5,154	)
	Repurchased	28
	Options forfeited	558
	RSUs forfeited	479
	Balance at end of fiscal year	8,066
Summary of Stock Options, Valuation Assumptions	'
	The following table summarizes the assumptions relating to our stock options:
		Year Ended July 31,
		2013		2012
	Risk-free interest rate	1.00%		0.7% - 1.1%
	Expected term	6 years		4 – 6 years
	Volatility	50%		49% – 51%
	Dividend yield	—%		—%
Summary of Employee Stock Purchase Plan, Valuation Assumptions	'
	The following table summarizes the assumptions related to the 2012 ESPP:
		Year Ended July 31,
		2014		2013		2012
	Risk-free interest rate	0.10%		0.10%		0.10%
	Expected term	< 1 year		< 1 year		< 1 year
	Volatility	40%		42%		46%
	Dividend yield	—%		—%		—%
Schedule of Allocation of Share Based Compensation Expense	'
	The following table summarizes share-based compensation included in costs and expenses (in thousands):
		Year Ended July 31,
		2014				2013			2012
	Cost of revenue	$	11,070			$	4,351		$	774
	Research and development	29,524				9,931			3,733
	Sales and marketing	42,647				20,493			4,267
	General and administrative	16,668				9,101			5,151
	Total	$	99,909			$	43,876		$	13,925

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Jul. 31, 2014
Income Tax Disclosure [Abstract]	'
Schedule of Income before Income Tax, Domestic and Foreign	'
	The following table presents the components of income (loss) before income taxes (in thousands):
		Year Ended July 31,
		2014				2013				2012
	United States	$	(149,243	)		$	5,198			$	1,646
	Foreign	(72,917		)		(23,854		)		1,153
	Total	$	(222,160	)		$	(18,656	)		$	2,799
Schedule of Components of Income Tax Expense (Benefit)	'
	The following table summarizes the provision for income taxes (in thousands):
		Year Ended July 31,
		2014				2013				2012
	Federal:
	Current	$	795			$	5,883			$	525
	Deferred	—				—				—
	State:
	Current	230				1,758				647
	Deferred	(324		)		—				—
	Foreign:
	Current	4,679				3,296				861
	Deferred	(1,088		)		(347		)		29
	Total	$	4,292			$	10,590			$	2,062
Schedule of Effective Income Tax Rate Reconciliation	'
	The following table presents the items accounting for the difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes:
		Year Ended July 31,
		2014			2013			2012
	Federal statutory rate	35	%		35	%		34	%
	Effect of:
	State taxes, net of federal tax benefit	1.3			1			9.7
	Change in valuation allowance	(20.0	)		(7.3	)		(85.4	)
	Foreign income at other than U.S. rates	(12.1	)		(62.4	)		17.2
	Share-based compensation	(3.2	)		(16.1	)		66.6
	Preferred stock warrant liability	—			—			12.3
	Meals and entertainment	(0.3	)		(2.0	)		11.9
	Other, net	(2.6	)		(5.0	)		7.4
	Total	(1.9	)%		(56.8	)%		73.7	%
Schedule of Deferred Tax Assets and Liabilities	'
	The following table presents the components of our deferred tax assets and liabilities as of July 31, 2014 and July 31, 2013 (in thousands):
		July 31,
		2014				2013
	Deferred tax assets:
	Accruals and reserves	$	38,372			$	23,461
	Research and development and foreign tax credits	8,741				4,702
	Net operating loss carryforwards	32,282				2,170
	Share-based compensation	17,715				10,619
	Gross deferred tax assets	97,110				40,952
	Valuation allowance	(89,309		)		(37,659		)
	Total deferred tax assets	7,801				3,293
	Deferred tax liabilities:
	Fixed assets and intangible assets	(15,040		)		(2,937		)
	Other deferred tax liabilities	(565		)		—
	Total deferred tax liabilities	(15,605		)		(2,937		)
	Total	$	(7,804	)		$	356
Schedule of Unrecognized Tax Benefits Roll Forward	'
	The following table presents a reconciliation of the beginning and ending amount of gross unrecognized tax benefits (in thousands):
		Year Ended July 31,
		2014				2013				2012
	Unrecognized tax benefits at the beginning of the period	$	6,561			$	2,630			$	1,972
	Additions for tax positions taken in prior years	428				585				9
	Reductions for tax positions taken in prior years	—				(3		)		—
	Additions for tax positions related to the current year	3,396				3,349				649
	Settlements	—				—				—
	Lapse of statute of limitations	—				—				—
	Unrecognized tax benefits at the end of the period	$	10,385			$	6,561			$	2,630

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	12 Months Ended
	Jul. 31, 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 income (loss) per share of common stock (in thousands, except per share data):
		Year Ended July 31,
		2014				2013			2012
	Net income (loss) used to compute net income (loss) per share:
	Net income (loss)	$	(226,452	)		$	(29,246	)	$	737
	Less: undistributed earnings allocated to participating securities	—				—			(737		)
	Net income (loss) attributable to common stockholders, basic and diluted	$	(226,452	)		$	(29,246	)	$	—
	Weighted-average shares used to compute net income (loss) per share attributable to common stockholders:
	Weighted-average shares used to compute net income (loss) per share attributable to common stockholders, basic and diluted	74,291				68,682			19,569
	Net income (loss) per share attributable to common stockholders, basic and diluted	$	(3.05	)		$	(0.43	)	$	0
Schedule of antidilutive securities excluded from computation of net income (loss) per share	'
	The following securities were excluded from the computation of diluted net income (loss) per common share applicable to common stockholders for the periods presented as their effect would have been antidilutive (in thousands):
		Year Ended July 31,
		2014			2013			2012
	Options	5,830			10,033			4,116
	RSUs	6,046			2,241			—
	ESPP shares	95			114			—
	Convertible senior notes	5,214			—			—
	Warrants related to the issuance of convertible senior notes	5,214			—			—

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Jul. 31, 2014
Segment Reporting [Abstract]	'
Revenue from External Customers by Geographic Areas	'
	The following table presents revenue by geographic theater based on the billing address of the partner (in thousands):
		Year Ended July 31,
		2014		2013		2012
	Revenue:
	Americas
	United States	$	363,174	$	228,604	$	151,435
	Other Americas	33,452		19,012		10,438
	Total Americas	396,626		247,616		161,873
	EMEA	126,915		91,496		61,994
	APAC	74,638		56,995		31,271
	Total revenue	$	598,179	$	396,107	$	255,138
Revenue from External Customers by Products and Services	'
	The following table presents revenue for groups of similar product and services (in thousands):
		Year Ended July 31,
		2014		2013		2012
	Revenue:
	Product	$	340,143	$	243,707	$	174,462
	Services
	Subscription	123,236		71,203		38,698
	Support and maintenance	134,800		81,197		41,978
	Total services	258,036		152,400		80,676
	Total revenue	$	598,179	$	396,107	$	255,138

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Jul. 31, 2014
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'
	The following tables set forth selected unaudited financial data for the years ended July 31, 2014 and 2013 (in thousands, except per share amounts):
		Three Months Ended
		Oct. 31,			Jan. 31,			Apr. 30,			Jul. 31,
		2013			2014			2014			2014
	Revenue:
	Product	$	75,485		$	80,823		$	84,128		$	99,707
	Services	52,695			60,245			66,572			78,524
	Total revenue	128,180			141,068			150,700			178,231
	Cost of revenue:
	Product	17,954			20,221			20,425			26,903
	Services	15,853			17,283			19,285			21,704
	Total cost of revenue	33,807			37,504			39,710			48,607
	Total gross profit	94,373			103,564			110,990			129,624
	Operating expenses:
	Research and development	19,893			24,253			27,837			32,830
	Sales and marketing	67,366			76,734			83,995			106,668
	General and administrative	14,125			19,733			23,717			15,574
	Legal settlement (Note 9)	—			20,000			121,173			—
	Total operating expenses	101,384			140,720			256,722			155,072
	Operating loss	(7,011		)	(37,156		)	(145,732		)	(25,448		)
	Interest expense	(8		)	(14		)	(13		)	(1,848		)
	Other income (expense), net	405			(170		)	430			(5,595		)
	Loss before income taxes	(6,614		)	(37,340		)	(145,315		)	(32,891		)
	Provision for (benefit from) income taxes	1,247			2,606			1,272			(833		)
	Net loss	$	(7,861	)	$	(39,946	)	$	(146,587	)	$	(32,058	)
	Net loss per share, basic and diluted	$	(0.11	)	$	(0.55	)	$	(1.96	)	$	(0.41	)
		Three Months Ended
		Oct. 31,			Jan. 31,			Apr. 30,			Jul. 31,
		2012			2013			2013			2013
	Revenue:
	Product	$	55,514		$	61,944		$	60,793		$	65,456
	Services	30,420			34,555			40,496			46,929
	Total revenue	85,934			96,499			101,289			112,385
	Cost of revenue:
	Product	14,416			16,636			15,855			16,505
	Services	9,774			10,982			11,835			13,753
	Total cost of revenue	24,190			27,618			27,690			30,258
	Total gross profit	61,744			68,881			73,599			82,127
	Operating expenses:
	Research and development	13,312			15,495			16,048			17,627
	Sales and marketing	42,607			45,796			51,733			59,635
	General and administrative	8,956			9,747			12,268			11,748
	Total operating expenses	64,875			71,038			80,049			89,010
	Operating loss	(3,131		)	(2,157		)	(6,450		)	(6,883		)
	Interest expense	(40		)	(7		)	(18		)	(9		)
	Other income (expense), net	(32		)	63			(6		)	14
	Loss before income taxes	(3,203		)	(2,101		)	(6,474		)	(6,878		)
	Provision for income taxes	312			512			808			8,958
	Net loss	$	(3,515	)	$	(2,613	)	$	(7,282	)	$	(15,836	)
	Net loss per share, basic and diluted	$	(0.05	)	$	(0.04	)	$	(0.10	)	$	(0.22	)

Description_of_Business_and_Su2

Description of Business and Summary of Significant Accounting Policies Concentration Risk (Details)	12 Months Ended
	Jul. 31, 2014
Customer A | Accounts Receivable	'
Concentration Risk	'
Concentration Risk, Percentage	36.00%
Customer A | Revenue	'
Concentration Risk	'
Concentration Risk, Percentage	32.00%
Customer B | Accounts Receivable	'
Concentration Risk	'
Concentration Risk, Percentage	24.00%
Customer B | Revenue	'
Concentration Risk	'
Concentration Risk, Percentage	25.00%
Customer C | Accounts Receivable	'
Concentration Risk	'
Concentration Risk, Percentage	13.00%
Customer C | Revenue	'
Concentration Risk	'
Concentration Risk, Percentage	13.00%

Description_of_Business_and_Su3

Description of Business and Summary of Significant Accounting Policies Advertising Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'	'
Advertising Expense	$3,693	$1,808	$1,604

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'	'
Cash equivalents	$0	$180,367
Short-term investments	118,690	109,007
Long-term investments	201,880	17,314
Other assets	1,220	1,221
Total assets measured at fair value	321,790	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	0	46,700
Short-term investments	118,690	109,007
Long-term investments	201,880	17,314
Other assets	0	0
Total assets measured at fair value	320,570	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	1,000	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	1,000	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	0	46,700
Short-term investments	96,451	76,173
Long-term investments	161,862	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	0	46,700
Short-term investments	96,451	76,173
Long-term investments	161,862	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	22,239	32,834
Long-term investments	39,018	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	22,239	32,834
Long-term investments	39,018	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 $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities	'	'
Amortized Cost	$320,675	$306,704
Unrealized Gains	61	20
Unrealized Losses	-166	-36
Total Estimated Fair Value	320,570	306,688
Certificates of deposit	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	1,000	1,822
Unrealized Gains	0	0
Unrealized Losses	0	0
Total Estimated Fair Value	1,000	1,822
Corporate debt securities	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	61,299	45,173
Unrealized Gains	16	12
Unrealized Losses	-58	-34
Total Estimated Fair Value	61,257	45,151
U.S. government and agency securities	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	258,376	127,864
Unrealized Gains	45	8
Unrealized Losses	-108	-2
Total Estimated Fair Value	258,313	127,870
Money market funds	'	'
Schedule of Available-for-sale Securities	'	'
Amortized Cost	'	131,845
Unrealized Gains	'	0
Unrealized Losses	'	0
Total Estimated Fair Value	'	$131,845

Investments_AvailableforSale_I1

Investments Available-for-Sale Investments in Unrealized Loss Position (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	$186,358	$47,355
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	186,358	47,355
Less than 12 Months, Unrealized Loss	-166	-36
12 Months or Greater, Unrealized Loss	0	0
Unrealized Losses	-166	-36
Corporate debt securities	'	'
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	43,868	31,429
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	43,868	31,429
Less than 12 Months, Unrealized Loss	-58	-34
12 Months or Greater, Unrealized Loss	0	0
Unrealized Losses	-58	-34
U.S. government and agency securities	'	'
Schedule of Available-for-sale Securities	'	'
Less than 12 Months, Fair Value	142,490	15,926
12 Months or Greater, Fair Value	0	0
Total, Unrealized Loss Position, Fair Value	142,490	15,926
Less than 12 Months, Unrealized Loss	-108	-2
12 Months or Greater, Unrealized Loss	0	0
Unrealized Losses	($108)	($2)

Investments_Proceeds_from_sale

Investments Proceeds from sales of investments (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Investments, Debt and Equity Securities [Abstract]	'	'	'
Proceeds from sales of investments	$74,597	$13,491	$0

Investments_AvailableforSale_I2

Investments Available-for-Sale Investments, Contractual Maturities (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost	'	'
Due within one year	$118,678	'
Due within one to two years	193,952	'
Due within two to three years	8,045	'
Total	320,675	'
Fair Value	'	'
Due within one year	118,690	'
Due within one to two years	193,853	'
Due within two to three years	8,027	'
Total Estimated Fair Value	$320,570	$306,688

Acquisitions_Additioanal_Detai

Acquisitions Additioanal Details of Acquisitions (Details) (USD $)	0 Months Ended	12 Months Ended	0 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Sep. 04, 2013	Jul. 31, 2014	Apr. 09, 2014	Jul. 31, 2014	Dec. 26, 2013
			Cyvera	Cyvera	Morta
Business Acquisition	'	'	'	'	'
Consideration, common stock issued (in shares)	'	'	1,281	'	'
Restricted stock unit issued to replace Cyvera's unvested options, fair value	'	'	$6,353	'	'
Restricted stock issued during period, share-based compensation, shares (in shares)	'	'	276	'	'
Restricted stock issued during period, share-based compensation, value	'	'	17,612	'	'
Period to release restriction on restricted common stock (in years)	'	'3 years	'3 years	'	'
Acquisition costs	'	'	'	3,940	'
Cash withheld for Morta's indemnification obligations	'	'	'	'	2,500
Finite-lived Intangible Assets Acquired	$5,000	'	'	'	$2,200
Estimated Useful Life (in years)	'13 years	'	'	'	'

Acquisitions_Consideration_Tra

Acquisitions Consideration Transferred (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Apr. 09, 2014	Dec. 26, 2013
	Cyvera	Morta
Business Acquisition	'	'
Cash	$90,170	$10,345
Common stock	87,477	'
Total	$177,647	'

Acquisitions_Acquisition_purch

Acquisitions Acquisition purchase price allocation (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013	Dec. 26, 2013	Apr. 09, 2014
In Thousands, unless otherwise specified			Morta	Cyvera
Business Acquisition	'	'	'	'
Cash	'	'	'	$6,930
Goodwill	155,033	0	10,127	144,906
Identified intangible assets	'	'	'	42,300
Identified intangible assets	'	'	2,200	'
Accrued and other liabilities, net	'	'	-1,982	-6,950
Long-term deferred tax liability, net	'	'	'	-9,539
Total	'	'	$10,345	$177,647

Acquisitions_Intangible_assets

Acquisitions Intangible assets acquired as part of business combination (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Sep. 04, 2013	Dec. 26, 2013	Apr. 09, 2014	Dec. 26, 2013	Apr. 09, 2014	Apr. 09, 2014	Dec. 26, 2013	Apr. 09, 2014
		Morta	Cyvera	In-process research and development held for defensive purposes	Developed technology	In-process research and development	Other	Other
				Morta	Cyvera	Cyvera	Morta	Cyvera
Business Acquisition	'	'	'	'	'	'	'	'
Finite-lived Intangible Assets Acquired	$5,000	$2,200	'	$1,900	$34,500	'	$300	$200
Estimated Useful Life (in years)	'13 years	'	'	'3 years	'7 years	'	'2 years	'2 years
Indefinite-lived Intangible Assets Acquired	'	'	'	'	'	7,600	'	'
Intangible Assets Acquired	'	'	$42,300	'	'	'	'	'

Acquisitions_Acquisition_Pro_F

Acquisitions Acquisition Pro Forma Detail (Details) (Cyvera, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Cyvera	'	'
Business Acquisition	'	'
Total revenue	$598,254	$396,131
Net loss	($241,920)	($43,041)

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets Goodwill (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014
Goodwill and Intangible Asset Impairment [Abstract]	'
Goodwill, Gross, Beginning	$0
Goodwill, Acquired During Period	155,033
Goodwill, Gross, Ending	155,033
Goodwill, Accumulated Impairment Loss, Beginning	0
Goodwill, Impairment Loss	0
Goodwill, Impaired, Accumulated Impairment Loss, Ending	0
Goodwill, Net, Beginning	0
Goodwill, Net, Period Increase (Decrease)	155,033
Goodwill, Net, Ending	$155,033

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets Intangible Assets and Related Amortization (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets	'	'
Gross carrying amount	$43,446	'
Accumulated amortization	-3,091	'
Net Carrying Amount	40,355	'
Intangible Assets, Gross (Excluding Goodwill)	51,046	'
Intangible assets, net	47,955	1,358
In-process research and development	'	'
Acquired Finite-Lived Intangible Assets	'	'
Indefinite-Lived Intangible Assets, Gross	7,600	'
Indefinite-Lived Intangible Assets, Net	7,600	'
Developed technology	'	'
Acquired Finite-Lived Intangible Assets	'	'
Gross carrying amount	34,500	'
Accumulated amortization	-1,643	'
Net Carrying Amount	32,857	'
Acquired intellectual property	'	'
Acquired Finite-Lived Intangible Assets	'	'
Gross carrying amount	6,546	1,546
Accumulated amortization	-958	-188
Net Carrying Amount	5,588	1,358
In-process research and development held for defensive purposes	'	'
Acquired Finite-Lived Intangible Assets	'	'
Gross carrying amount	1,900	'
Accumulated amortization	-370	'
Net Carrying Amount	1,530	'
Other	'	'
Acquired Finite-Lived Intangible Assets	'	'
Gross carrying amount	500	'
Accumulated amortization	-120	'
Net Carrying Amount	$380	'

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets Amortization expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'
Amortization of Intangible Assets	$2,903	$125	$39

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets Future Amortization Expense (Details) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets	'
2015	$6,572
2016	6,395
2017	5,803
2018	5,412
2019	5,327
2020 and thereafter	10,846
Developed technology	'
Acquired Finite-Lived Intangible Assets	'
2015	4,928
2016	4,928
2017	4,928
2018	4,928
2019	4,928
2020 and thereafter	8,217
Acquired intellectual property	'
Acquired Finite-Lived Intangible Assets	'
2015	761
2016	704
2017	611
2018	484
2019	399
2020 and thereafter	2,629
In-process research and development held for defensive purposes	'
Acquired Finite-Lived Intangible Assets	'
2015	633
2016	633
2017	264
2018	0
2019	0
2020 and thereafter	0
Other	'
Acquired Finite-Lived Intangible Assets	'
2015	250
2016	130
2017	0
2018	0
2019	0
2020 and thereafter	$0

Other_Financial_Information_Pr

Other Financial Information Property and Equipment (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment	'	'
Property and equipment, gross	$79,366	$51,562
Less: accumulated depreciation	-30,622	-19,476
Total property and equipment, net	48,744	32,086
Computers, equipment, and software	'	'
Property, Plant and Equipment	'	'
Property and equipment, gross	38,147	27,239
Leasehold Improvements	'	'
Property, Plant and Equipment	'	'
Property and equipment, gross	21,258	10,176
Demonstration units	'	'
Property, Plant and Equipment	'	'
Property and equipment, gross	14,832	11,401
Furniture and fixtures	'	'
Property, Plant and Equipment	'	'
Property and equipment, gross	$5,129	$2,746

Other_Financial_Information_De

Other Financial Information Depreciation expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Property, Plant and Equipment [Abstract]	'	'	'
Depreciation expense	$14,028	$9,786	$6,057

Other_Financial_Information_Ac

Other Financial Information Accrued Liabilities - Current (Details) (USD $)	Jul. 31, 2014	Jul. 31, 2013
In Thousands, unless otherwise specified
Accrued Liabilities, Current [Abstract]	'	'
Accrued expenses payable	$12,210	$11,144
Other liabilities	12,790	3,465
Total accrued and other liabilities	$25,000	$14,609

Convertible_Senior_Notes_Detai

Convertible Senior Notes (Details) (USD $)	0 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Debt Instrument	'	'	'	'
Convertible Senior Notes, Issuance Date	30-Jun-14	'	'	'
Principal amount	$575,000	$575,000	'	'
Contractual interest rate (in percentage)	0.00%	'	'	'
Maturity Date	1-Jul-19	'	'	'
Convertible Senior Notes, Number of Common Stock Convertible (in shares)	5,214,000	'	'	'
Convertible Senior Notes, Initial Conversion Ratio (in shares per $1000 principal amount)	9.068	'	'	'
Convertible Senior Notes, Initial Conversion Price (in usd per share)	$110.28	'	'	'
Threshold Trading Days (in days)	20	'	'	'
Threshold Consecutive Trading Days (in days)	'30 days	'	'	'
Debt issuance costs	12,497	'	'	'
Equity issuance costs	2,949	'	'	'
Fair Value of Convertible Debt	'	587,087	'	'
Closing price of our common stock used to measure fair value of Convertible Senior Notes(in usd per share)	'	$80.86	'	'
Purchase of convertible note hedges	'	110,975	0	0
Number of Common Stock Covered by Note Hedge and Warrants (in shares)	5,214	'	'	'
Strike Price of Warrants (in usd per share)	$137.85	'	'	'
Proceeds from issuance of warrants	'	$78,258	$0	$0
Minimum	'	'	'	'
Debt Instrument	'	'	'	'
Threshold Percentage of Stock Price Trigger (in percentage)	130.00%	'	'	'
Maximum	'	'	'	'
Debt Instrument	'	'	'	'
Threshold Percentage of Stock Price Trigger (in percentage)	98.00%	'	'	'

Convertible_Senior_Notes_Compo

Convertible Senior Notes Component of Convertible Senior Notes (Details) (USD $)	Jul. 31, 2014	Jun. 30, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Principal amount	$575,000	$575,000
Less: debt discount, net of amortization	108,125	'
Net carrying amount	466,875	'
Equity	($109,785)	'

Convertible_Senior_Notes_Sched

Convertible Senior Notes Schedule of Interest Expense Recognized (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014
Debt Disclosure [Abstract]	'
Amortization of debt issuance costs	$166
Amortization of debt discount	1,660
Total	$1,826
Effective interest rate of the liability component	4.80%

Commitment_and_Contigencies_De

Commitment and Contigencies (Details) (USD $)	12 Months Ended			1 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Sep. 30, 2012	Sep. 20, 2012
				Santa Clara, California	Santa Clara, California
				Building	Building
Leases and Contract Manufacturer Commitments	'	'	'	'	'
Number of lease agreements entered into	'	'	'	2	'
Number of lease renewal options	'	'	'	2	'
Lease renewal option, number of years to extend the lease contract (in years)	'	'	'	'5 years	'
Total payments under the lease agreements	$105,710	'	'	'	$94,321
Payments under sub-lease	10,696	'	'	'	'
Rent credit under sub-lease	528	'	'	'	'
Rent expense	13,207	4,356	2,258	'	'
Contract Manufacturer Commitments	$29,895	'	'	'	'

Commitments_and_Contingencies_

Commitments and Contingencies Lease Commitment Schedule (Details) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'
2015	$14,170
2016	14,279
2017	13,187
2018	11,774
2019	9,697
2020 and thereafter	42,603
Committed gross lease payments	105,710
Less: proceeds from sublease rental	-10,696
Net operating lease obligation	$95,014

Legal_Settlement_Details

Legal Settlement (Details) (USD $)	3 Months Ended				12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	27-May-14	Jul. 31, 2014	Jan. 27, 2014	Jul. 31, 2014
								Juniper	Juniper	Fortinet	Fortinet
Loss Contingencies	'	'	'	'	'	'	'	'	'	'	'
Legal settlement amount, per agreement	'	'	'	'	'	'	'	$175,000,000	'	'	'
Legal settlement in cash, amount	'	'	'	'	'	'	'	75,000,000	'	'	'
Legal settlement in common stock, number of shares (in shares)	'	'	'	'	'	'	'	1,081	'	'	'
Legal settlement in common stock, amount, per agreement	'	'	'	'	'	'	'	70,000,000	'	'	'
Legal settlement in warrants, number of shares (in shares)	'	'	'	'	'	'	'	463	'	'	'
Legal settlement in warrants, amount, per agreement	'	'	'	'	'	'	'	30,000,000	'	'	'
Period of mutual covenant-not-to-sue for patent infringement (in years)	'	'	'	'	'	'	'	'8 years	'	'	'
Legal settlement amount, settlement date	'	'	'	'	'	'	'	182,473,000	'	20,000,000	'
Legal settlement in common stock, amount, settlement date	'	'	'	'	'	'	'	75,231,000	'	'	'
legal settlement in warrant, amount, settlement date	'	'	'	'	'	'	'	32,242,000	'	'	'
Legal settlement in warrants, exercise price (in usd per share)	'	'	'	'	'	'	'	$0.00	'	'	'
Change in fair value of common stock warrant	'	'	'	'	5,859,000	0	0	'	5,859,000	'	'
Cross licensing of intellectual property	'	'	'	'	'	'	'	61,300,000	'	'	'
Amortization period of cross licensing of intellectual property (in years)	'	'	'	'	'	'	'	'5 years	'	'	'
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	$0	$121,173,000	$20,000,000	$0	$141,173,000	$0	$0	'	$121,173,000	'	$20,000,000

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	1 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2012	Oct. 31, 2012	Jul. 31, 2012	Jul. 31, 2012	Oct. 31, 2012	Jul. 31, 2012
		IPO	Secondary offering	Common stock	Common stock	Common stock	Convertible Preferred Stock
				IPO Overallotment	IPO	Secondary offering	IPO
Class of Stock	'	'	'	'	'	'	'
Shares of common stock sold in public offering, including existing shares (in shares)	'	'	'	'	6,200	'	'
Price per share (in usd per share)	'	'	'	$42	$42	$63	'
Issuance of common stock from initial public offering (in shares)	'	'	'	930	4,687	'	'
Shares of common stock sold in public offering by existing shareholders (in shares)	'	'	'	'	1,513	4,800	'
Proceeds from IPO, gross	$219,400	'	'	'	'	'	'
Public offering expenses	'	4,000	'	'	'	'	'
Convertible preferred stock converted into shares of common stock (in shares)	'	'	'	'	'	'	41,305
Proceeds from sale of stock in public offering received by existing shareholders	'	'	$290,304	'	'	'	'

Equity_Award_Plans_ShareBased_

Equity Award Plans Share-Based Compensation Plans (Details) (USD $)	12 Months Ended
	Jul. 31, 2014
2012 Equity Incentive Plan	'
Share-based Compensation Arrangement by Share-based Payment Award	'
Award Vesting Period (in years)	'4 years
Expiration period (in years)	'10 years
Minimum exercise price for employees owning more than 10% of total combined voting power of all class of stock, percentage of fair market value (in percentage)	110.00%
Minimum exercise price for employees owning less than 10% of total combined voting power of all class of stock, percentage of fair market value (in percentage)	100.00%
Minimum exercise price of non-statutory stock option and options granted to consultants, percentage of fair market value (in percentage)	100.00%
Common Stock, Shares Reserved for Future Issuance (in shares)	19,941,000
Increase in number of shares reserved for issuance on the first day of fiscal year, maximum (in shares)	8,000,000
Increase in number of shares reserved for issuance on the first day of fiscal year, percentage of shares of common stock on the last day of preceeding fiscal year, maximum	4.50%
Employee Stock Purchase Plan (ESPP)	'
Share-based Compensation Arrangement by Share-based Payment Award	'
Common Stock, Shares Reserved for Future Issuance (in shares)	1,227,000
Increase in number of shares reserved for issuance on the first day of fiscal year, maximum (in shares)	2,000,000
Increase in number of shares reserved for issuance on the first day of fiscal year, percentage of shares of common stock on the last day of preceeding fiscal year, maximum	1.00%
Discount from Lesser of Market Price on Purchase Date or Offering Date	85.00%
ESPP Maximum Employee Subscription Rate	15.00%
ESPP Maximum Number of Shares Per Employee (in shares)	625
ESPP Maximum Purchase of Common Stock Value Per Employee	25,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'
Issuance of common stock in connection with employee stock purchase plan (in shares)	319,000
Average Price of Common Stock Purchased During the Period (in usd per share)	40.36

Equity_Award_Plans_Stock_Optio

Equity Award Plans Stock Options Activity (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Options, Outstanding Roll Forward	'	'	'
Balance, beginning (in shares)	10,033	'	'
Options granted (in shares)	0	'	'
Options forfeited (in shares)	-558	'	'
Options exercised (in shares)	-3,645	'	'
Balance, ending (in shares)	5,830	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)	$14.62	'	'
Options exercised (in usd per share)	$9.25	'	'
Balance, ending (in usd per share)	$13.02	$11.74	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]	'	'	'
Weighted-Average Remaining Contractual Life (in years)	'7 years	'7 years 9 months	'
Aggregate Intrinsic Value	$395,507	$373,228	'
Options vested and expected to vest (in shares)	5,698	'	'
Options vested and expected to vest, Weighted-Average Exercise Price (in usd per share)	$12.92	'	'
Options vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	'7 years	'	'
Options vested and expected to vest, Aggregate Intrinsic Value	387,122	'	'
Options exercisable (in shares)	3,412	'	'
Options exercisable, Weighted-Average Exercise Price (in usd per share)	$10.51	'	'
Options exercisable, Weighted-Average Remaining Contractual Term (in years)	'6 years 9 months	'	'
Options exercisable, Aggregate Intrinsic Value	240,034	'	'
Options, Grants in Period, Weighted Average Grant Date Fair Value (in usd per share)	$0	$26.09	$8.17
Options, Exercises in Period, Total Intrinsic Value	198,828	186,845	20,334
Options, Vested in Period, Grant Date Fair Value	$17,137	$21,351	$6,960

Equity_Award_Plans_RSUs_Activi

Equity Award Plans RSUs Activities (Details) (Restricted Stock Units (RSUs), USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Restricted Stock Units (RSUs)	'	'	'
RSUs, Outstanding Roll Forward	'	'	'
Balance, beginning (in shares)	2,241	'	'
RSUs granted (in shares)	5,154	'	'
RSUs vested (in shares)	-870	'	'
RSUs forfeited (in shares)	-479	'	'
Balance, ending (in shares)	6,046	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)	$61	$54.51	$0
RSUs vested (in usd per share)	$55.03	'	'
RSUs forfeited (in usd per share)	$55.42	'	'
Balance, ending (in usd per share)	$59.84	$54.36	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'	'	'
Weighted-Average Remaining Contractual Term (in years)	'1 year 5 months	'1 year 6 months	'
Aggregate Intrinsic Value	$488,880	$109,675	'
RSUs vested and expected to vest (in shares)	5,473	'	'
RSUs vested and expected to vest, Weighted-Average Grant-Date Fair Value Per Share (in usd per share)	$59.65	'	'
RSUs vested and expected to vest, Weighted-Average Remaining Contractual Term (in years)	'1 year 4 months	'	'
RSUs vested and expected to vest, Aggregate Intrinsic Value	442,547	'	'
Fair value of RSUs vested	$57,431	$272	$0

Equity_Award_Plans_Shares_Avai

Equity Award Plans Shares Available for Grant (Details)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014
Shares Available For Grant Roll Forward	'
Balance at beginning of fiscal year (in shares)	8,932
Authorized (in shares)	3,223
Repurchased (in shares)	28
Options forfeited (in shares)	558
Balance at end of fiscal year (in shares)	8,066
Restricted Stock Units (RSUs)	'
Shares Available For Grant Roll Forward	'
RSUs granted (in shares)	-5,154
RSUs forfeited (in shares)	479

Equity_Award_Plans_Stock_Optio1

Equity Award Plans Stock Options, Valuation Assumptions (Details) (Stock Option)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award	'	'
Risk-free Interest Rate, Minimum (in percentage)	'	0.70%
Risk-free Interest Rate, Maximum (in percentage)	'	1.10%
Risk-free interest rate (in percentage)	1.00%	'
Expected Term (in years)	'6 years	'
Volatility (in percentage)	50.00%	'
Volatility, Minimum (in percentage)	'	49.00%
Volatility, Maximum (in percentage)	'	51.00%
Dividend yield (in percentage)	0.00%	0.00%
Minimum	'	'
Share-based Compensation Arrangement by Share-based Payment Award	'	'
Expected Term (in years)	'	'4 years
Maximum	'	'
Share-based Compensation Arrangement by Share-based Payment Award	'	'
Expected Term (in years)	'	'6 years

Equity_Award_Plans_Employee_St

Equity Award Plans Employee Stock Purchase Plan, Valuation Assumptions (Details) (Employee Stock Purchase Plan (ESPP))	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Employee Stock Purchase Plan (ESPP)	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award	'	'	'
Risk-free interest rate (in percentage)	0.10%	0.10%	0.10%
Expected Term (in years)	'6 months	'6 months	'6 months
Volatility (in percentage)	40.00%	42.00%	46.00%
Dividend yield (in percentage)	0.00%	0.00%	0.00%

Equity_Award_Plans_Allocation_

Equity Award Plans Allocation of Share Based Compensation Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'
Allocated Share-based Compensation Expense	$99,909	$43,876	$13,925
Cost of revenue	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'
Allocated Share-based Compensation Expense	11,070	4,351	774
Research and development	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'
Allocated Share-based Compensation Expense	29,524	9,931	3,733
Sales and marketing	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'
Allocated Share-based Compensation Expense	42,647	20,493	4,267
General and administrative	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs	'	'	'
Allocated Share-based Compensation Expense	$16,668	$9,101	$5,151

Equity_Award_Plans_Allocation_1

Equity Award Plans Allocation of Share-based Compensation 2 (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'	'	'
Allocated Share-based Compensation Expense	$99,909	$43,876	$13,925
Total compensation cost not yet recognized, nonvested awards, net of estimated forfeitures	320,805	'	'
Compensation Cost Not yet Recognized, Period for Recognition (in years)	'3 years	'	'
Employee Stock Purchase Plan (ESPP)	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'	'	'
Allocated Share-based Compensation Expense	4,473	5,263	172
Sales and marketing	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'	'	'
Allocated Share-based Compensation Expense	42,647	20,493	4,267
Plan Modification, Incremental Compensation Cost	'	1,861	'
Research and development	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'	'	'
Allocated Share-based Compensation Expense	29,524	9,931	3,733
Plan Modification, Incremental Compensation Cost	'	'	854
General and administrative	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]	'	'	'
Allocated Share-based Compensation Expense	16,668	9,101	5,151
Plan Modification, Incremental Compensation Cost	$3,446	'	'

Income_Taxes_Income_loss_Befor

Income Taxes Income (loss) Before Provision for Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
United States	'	'	'	'	'	'	'	'	($149,243)	$5,198	$1,646
Foreign	'	'	'	'	'	'	'	'	-72,917	-23,854	1,153
Income (loss) before income taxes	($32,891)	($145,315)	($37,340)	($6,614)	($6,878)	($6,474)	($2,101)	($3,203)	($222,160)	($18,656)	$2,799

Income_Taxes_Schedule_of_Compo

Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Current Federal Income Tax Provision	'	'	'	'	'	'	'	'	$795	$5,883	$525
Deferred Federal Income Tax Provision	'	'	'	'	'	'	'	'	0	0	0
Current State and Local Income Tax Provision	'	'	'	'	'	'	'	'	230	1,758	647
Deferred State and Local Income Tax Provision (Benefit)	'	'	'	'	'	'	'	'	-324	0	0
Current Foreign Income Tax Provision	'	'	'	'	'	'	'	'	4,679	3,296	861
Deferred Foreign Income Tax Expense (Benefit)	'	'	'	'	'	'	'	'	-1,088	-347	29
Income Tax Provision	($833)	$1,272	$2,606	$1,247	$8,958	$808	$512	$312	$4,292	$10,590	$2,062

Income_Taxes_Effective_Tax_Rec

Income Taxes Effective Tax Reconciliation (Details)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'
Federal statutory rate	35.00%	35.00%	34.00%
State taxes, net of federal tax benefit	1.30%	1.00%	9.70%
Change in valuation allowance	-20.00%	-7.30%	-85.40%
Foreign income at other than U.S. rates	-12.10%	-62.40%	17.20%
Share-based compensation	-3.20%	-16.10%	66.60%
Preferred stock warrant liability	0.00%	0.00%	12.30%
Meals and entertainment	-0.30%	-2.00%	11.90%
Other, net	-2.60%	-5.00%	7.40%
Total	-1.90%	-56.80%	73.70%

Income_Taxes_Components_of_the

Income Taxes Components of the deferred tax assets and liabilities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Deferred tax assets:	'	'
Accruals and reserves	$38,372	$23,461
Research and development and foreign tax credits	8,741	4,702
Net operating loss carryforwards	32,282	2,170
Share-based compensation	17,715	10,619
Gross deferred tax assets	97,110	40,952
Valuation allowance	-89,309	-37,659
Total deferred tax assets	7,801	3,293
Deferred tax liabilities	'	'
Fixed assets and intangible assets	-15,040	-2,937
Other deferred tax liabilities	-565	0
Total deferred tax liabilities	-15,605	-2,937
Total	-7,804	356
Valuation Allowance, Deferred Tax Asset, Change in Amount	($51,650)	'

Income_Taxes_Net_Operating_Los

Income Taxes Net Operating Loss Carryforward (Details) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Federal	'
Operating Loss Carryforwards	'
Operating Loss Carryforwards	$330,428
State	'
Operating Loss Carryforwards	'
Operating Loss Carryforwards	233,973
Foreign	'
Operating Loss Carryforwards	'
Operating Loss Carryforwards	$16,038

Income_Taxes_Tax_Credit_Carryf

Income Taxes Tax Credit Carryforwards (Details) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Federal | Research Tax Credit Carryforward	'
Tax Credit Carryforward	'
Tax Credit Carryforward	$9,563
State | Research Tax Credit Carryforward	'
Tax Credit Carryforward	'
Tax Credit Carryforward	11,565
Foreign	'
Tax Credit Carryforward	'
Tax Credit Carryforward	$816

Income_Taxes_Additional_Inform

Income Taxes Additional Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'
Excess Tax Benefits Included in Federal Net Operating Losses, Share-based Awards	$257,674	'	'
Excess Tax Benefit included in State Net Operating Loss, Share-based Awards	149,759	'	'
Excess Tax Benefit Included in Foreign Net Operating Loss, Share-based Awards	5,786	'	'
Excess Tax Benefit Included in Federal Research and Development Tax Credit, Share-based Awards	5,289	'	'
Excess tax benefit from share-based compensation	957	6,762	215
Unrecognized Tax Benefits that Would Affect Income Tax Expense	3,878	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	336	222	72
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	630	294	'
Undistributed Earnings of Foreign Subsidiaries	$3,810	'	'

Income_Taxes_Unrecognized_tax_

Income Taxes Unrecognized tax benefit roll-forward (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns	'	'	'
Unrecognized tax benefits at the beginning of the period	$6,561	$2,630	$1,972
Additions for tax positions taken in prior years	428	585	9
Reductions for tax positions taken in prior years	0	-3	0
Additions for tax positions related to the current year	3,396	3,349	649
Settlements	0	0	0
Lapse of statute of limitations	0	0	0
Unrecognized tax benefits at the end of the period	$10,385	$6,561	$2,630

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								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Net income (loss) used to compute net income (loss) per share:	'	'	'	'	'	'	'	'	'	'	'
Net income (loss)	($32,058)	($146,587)	($39,946)	($7,861)	($15,836)	($7,282)	($2,613)	($3,515)	($226,452)	($29,246)	$737
Less: undistributed earnings allocated to participating securities	'	'	'	'	'	'	'	'	0	0	-737
Net income (loss) attributable to common stockholders, basic and diluted	'	'	'	'	'	'	'	'	($226,452)	($29,246)	$0
Weighted-average shares used to compute net income (loss) per share:	'	'	'	'	'	'	'	'	'	'	'
Weighted-average shares used to compute net income (loss) per share attributable to common stockholders, basic and diluted (in shares)	'	'	'	'	'	'	'	'	74,291	68,682	19,569
Net income (loss) per share attributable to common stockholders:	'	'	'	'	'	'	'	'	'	'	'
Net income (loss) per share attributable to common stockholders, basic and diluted (in usd per share)	($0.41)	($1.96)	($0.55)	($0.11)	($0.22)	($0.10)	($0.04)	($0.05)	($3.05)	($0.43)	$0

Net_Income_Loss_Per_Share_Sche

Net Income (Loss) Per Share Schedule of Antidilutive Securities Excluded from Computation (Details)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Options	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'	'
Antidilutive securities (in shares)	5,830	10,033	4,116
Restricted Stock Units (RSUs)	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'	'
Antidilutive securities (in shares)	6,046	2,241	0
ESPP shares	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'	'
Antidilutive securities (in shares)	95	114	0
Convertible senior notes	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'	'
Antidilutive securities (in shares)	5,214	0	0
Warrants related to the issuance of convertible senior notes	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share	'	'	'
Antidilutive securities (in shares)	5,214	0	0

Segment_Information_Revenue_by

Segment Information Revenue by geographic theater (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Segment Reporting Information	'	'	'
Revenues	$598,179	$396,107	$255,138
United States	'	'	'
Segment Reporting Information	'	'	'
Revenues	363,174	228,604	151,435
Other Americas	'	'	'
Segment Reporting Information	'	'	'
Revenues	33,452	19,012	10,438
Total Americas	'	'	'
Segment Reporting Information	'	'	'
Revenues	396,626	247,616	161,873
EMEA	'	'	'
Segment Reporting Information	'	'	'
Revenues	126,915	91,496	61,994
APAC	'	'	'
Segment Reporting Information	'	'	'
Revenues	$74,638	$56,995	$31,271

Segment_Information_Revenue_fr

Segment Information Revenue from External Customers by Products and Services (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Revenue from External Customer	'	'	'	'	'	'	'	'	'	'	'
Product	$99,707	$84,128	$80,823	$75,485	$65,456	$60,793	$61,944	$55,514	$340,143	$243,707	$174,462
Services	78,524	66,572	60,245	52,695	46,929	40,496	34,555	30,420	258,036	152,400	80,676
Total revenue	178,231	150,700	141,068	128,180	112,385	101,289	96,499	85,934	598,179	396,107	255,138
Subscription	'	'	'	'	'	'	'	'	'	'	'
Revenue from External Customer	'	'	'	'	'	'	'	'	'	'	'
Services	'	'	'	'	'	'	'	'	123,236	71,203	38,698
Support and maintenance	'	'	'	'	'	'	'	'	'	'	'
Revenue from External Customer	'	'	'	'	'	'	'	'	'	'	'
Services	'	'	'	'	'	'	'	'	$134,800	$81,197	$41,978

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Related Party Transactions [Abstract]	'	'
Revenue from sales transaction with related party	$6,173	$2,623

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Revenue:	'	'	'	'	'	'	'	'	'	'	'
Product	$99,707	$84,128	$80,823	$75,485	$65,456	$60,793	$61,944	$55,514	$340,143	$243,707	$174,462
Services	78,524	66,572	60,245	52,695	46,929	40,496	34,555	30,420	258,036	152,400	80,676
Total revenue	178,231	150,700	141,068	128,180	112,385	101,289	96,499	85,934	598,179	396,107	255,138
Cost of revenue:	'	'	'	'	'	'	'	'	'	'	'
Product	26,903	20,425	20,221	17,954	16,505	15,855	16,636	14,416	85,503	63,412	44,615
Services	21,704	19,285	17,283	15,853	13,753	11,835	10,982	9,774	74,125	46,344	25,938
Total cost of revenue	48,607	39,710	37,504	33,807	30,258	27,690	27,618	24,190	159,628	109,756	70,553
Total gross profit	129,624	110,990	103,564	94,373	82,127	73,599	68,881	61,744	438,551	286,351	184,585
Operating expenses:	'	'	'	'	'	'	'	'	'	'	'
Research and development	32,830	27,837	24,253	19,893	17,627	16,048	15,495	13,312	104,813	62,482	38,570
Sales and marketing	106,668	83,995	76,734	67,366	59,635	51,733	45,796	42,607	334,763	199,771	115,917
General and administrative	15,574	23,717	19,733	14,125	11,748	12,268	9,747	8,956	73,149	42,719	26,207
Legal settlement (Note 9)	0	121,173	20,000	0	'	'	'	'	141,173	0	0
Total operating expenses	155,072	256,722	140,720	101,384	89,010	80,049	71,038	64,875	653,898	304,972	180,694
Operating income (loss)	-25,448	-145,732	-37,156	-7,011	-6,883	-6,450	-2,157	-3,131	-215,347	-18,621	3,891
Interest expense	-1,848	-13	-14	-8	-9	-18	-7	-40	-1,883	-74	-36
Other income (expense), net	-5,595	430	-170	405	14	-6	63	-32	-4,930	39	-1,056
Income (loss) before income taxes	-32,891	-145,315	-37,340	-6,614	-6,878	-6,474	-2,101	-3,203	-222,160	-18,656	2,799
Provision (benefit) for income taxes	-833	1,272	2,606	1,247	8,958	808	512	312	4,292	10,590	2,062
Net income (loss)	($32,058)	($146,587)	($39,946)	($7,861)	($15,836)	($7,282)	($2,613)	($3,515)	($226,452)	($29,246)	$737
Net income (loss) per share attributable to common stockholders, basic and diluted (in usd per share)	($0.41)	($1.96)	($0.55)	($0.11)	($0.22)	($0.10)	($0.04)	($0.05)	($3.05)	($0.43)	$0