Infoblox 10-Q 6 Mar 15 2015 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jan. 31, 2015	Feb. 28, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	INFOBLOX INC
Entity Central Index Key	1223862
Current Fiscal Year End Date	-24
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Jan-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		56,660,371

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jan. 31, 2015	Jul. 31, 2014
In Thousands, unless otherwise specified
CURRENT ASSETS:
Cash and cash equivalents	$94,234	$78,535
Short-term investments	205,628	191,316
Accounts receivable, net	38,893	36,420
Inventory	7,612	6,345
Prepaid expenses and other current assets	8,902	7,506
Total current assets	355,269	320,122
Property and equipment, net	18,771	18,785
Restricted cash	3,518	3,516
Intangible assets, net	2,862	4,096
Goodwill	33,293	33,293
Other assets	1,432	756
TOTAL ASSETS	415,145	380,568
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	15,855	15,648
Accrued compensation	16,444	13,197
Deferred revenue, net	92,837	81,964
Total current liabilities	125,136	110,809
Deferred revenue, net	38,515	34,149
Other liabilities	5,946	6,314
TOTAL LIABILITIES	169,597	151,272
Commitments and contingencies (Note 5)
STOCKHOLDERS’ EQUITY:
Convertible preferred stock, $0.0001 par value per share—5,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.0001 par value per share—100,000 shares authorized; 56,525 shares and 55,065 shares issued and outstanding as of January 31, 2015 and July 31, 2014	6	6
Additional paid-in capital	399,210	365,833
Accumulated other comprehensive income (loss)	12	-84
Accumulated deficit	-153,680	-136,459
TOTAL STOCKHOLDERS’ EQUITY	245,548	229,296
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$415,145	$380,568

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 31, 2015	Jul. 31, 2014
Statement of Financial Position [Abstract]
Convertible preferred stock, par value (USD per share)	$0.00	$0.00
Convertible preferred stock, shares authorized	5,000,000	5,000,000
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0
Common stock, par value (USD per share)	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,525,000	55,065,000
Common stock, shares outstanding	56,525,000	55,065,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Net revenue:
Products and licenses	$37,917	$31,565	$69,425	$67,527
Services	36,387	29,317	71,598	56,876
Total net revenue	74,304	60,882	141,023	124,403
Cost of revenue:
Products and licenses	8,787	7,086	16,254	14,973
Services	7,491	6,633	14,958	12,454
Total cost of revenue	16,278	13,719	31,212	27,427
Gross profit	58,026	47,163	109,811	96,976
Operating expenses:
Research and development	15,504	11,844	30,074	23,444
Sales and marketing	39,788	32,854	78,243	65,985
General and administrative	9,355	6,848	17,315	13,834
Total operating expenses	64,647	51,546	125,632	103,263
Loss from operations	-6,621	-4,383	-15,821	-6,287
Other expense, net	-590	-103	-780	-204
Loss before provision for (benefit from) income taxes	-7,211	-4,486	-16,601	-6,491
Provision for (benefit from) income taxes	-200	-92	620	452
Net loss	($7,011)	($4,394)	($17,221)	($6,943)
Net loss per share - basic and diluted (USD per share)	($0.13)	($0.08)	($0.31)	($0.13)
Weighted-average shares used in computing net loss per share - basic and diluted (shares)	56,087	53,284	55,729	52,779

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	($7,011)	($4,394)	($17,221)	($6,943)
Unrealized holding gain on short-term investments, net	105	23	96	45
Comprehensive loss	($6,906)	($4,371)	($17,125)	($6,898)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	($17,221)	($6,943)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation	24,339	19,465
Depreciation and amortization	4,437	4,320
Excess tax benefits from employee stock plans	-241	-124
Other	1,552	319
Changes in operating assets and liabilities:
Accounts receivable, net	-2,473	5,191
Inventory	-1,267	-919
Prepaid expenses, other current assets and other assets	-907	640
Accounts payable and accrued liabilities	553	1,619
Accrued compensation	3,247	-3,075
Deferred revenue, net	15,239	12,362
Other liabilities	-430	-375
Net cash provided by operating activities	26,828	32,480
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of short-term investments	-56,316	-68,813
Proceeds from maturities of short-term investments	40,880	40,160
Proceeds from sales of short-term investments	1,001	0
Purchases of property and equipment	-3,299	-3,725
Business acquisition	0	-1,000
Net cash used in investing activities	-17,734	-33,378
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock under the employee stock plans	7,633	13,976
Excess tax benefits from employee stock plans	241	124
Net cash provided by financing activities	7,874	14,100
Effect of foreign exchange rate changes on cash and cash equivalents	-1,269	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	15,699	13,202
CASH AND CASH EQUIVALENTS—Beginning of period	78,535	69,828
CASH AND CASH EQUIVALENTS—End of period	94,234	83,030
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Purchases of property and equipment not yet paid	378	214
Cash paid for income taxes, net	138	229
Restricted stock units issued in connection with business acquisition	$0	$573

Description_of_the_Business_an

Description of the Business and Summary of Significant Accounting Policies	6 Months Ended
	Jan. 31, 2015
Accounting Policies [Abstract]
Description of the Business and Summary of Significant Accounting Policies	DESCRIPTION OF THE BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Business
	Infoblox Inc. (together with our subsidiaries, “we,” “us” or “our”) was originally incorporated in the State of Illinois in February 1999 and was reincorporated in the State of Delaware in May 2003. We are headquartered in Santa Clara, California and have subsidiaries and representative offices located throughout the world. We provide a broad family of enterprise and service provider-class solutions to automate management of the critical network infrastructure services needed for secure, scalable and fault-tolerant connections between applications, devices and users.
	Basis of Presentation
	The condensed consolidated financial statements include our accounts and the accounts of our wholly-owned subsidiaries. Intercompany transactions and balances have been eliminated. The accompanying condensed consolidated balance sheet as of January 31, 2015 and the condensed consolidated statements of operations and the condensed consolidated statements of comprehensive loss for the three and six months ended January 31, 2015 and 2014 and the condensed consolidated statements of cash flows for the six months ended January 31, 2015 and 2014 are unaudited. The condensed consolidated balance sheet as of July 31, 2014 was derived from the audited consolidated balance sheet as of July 31, 2014. These unaudited condensed consolidated financial statements and accompanying notes should be read together with the audited consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the fiscal year ended July 31, 2014.
	The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP, pursuant to the rules and regulations of the Securities Exchange Commission, or SEC. They do not include all of the financial information and footnotes required by GAAP for complete financial statements. We believe the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited financial statements and include all adjustments necessary for the fair presentation of our balance sheet as of January 31, 2015, our results of operations and comprehensive loss for the three and six months ended January 31, 2015 and 2014 and cash flows for the six months ended January 31, 2015 and 2014. All adjustments are of a normal recurring nature. The results for the three and six months ended January 31, 2015 are not necessarily indicative of the results to be expected for any subsequent quarter or for the year ending July 31, 2015.
	Significant Accounting Policies
	We describe our significant accounting policies in Note 1 to the consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the fiscal year ended July 31, 2014. There have been no significant changes in our accounting policies during the six months ended January 31, 2015, as compared to the significant accounting policies described in our Annual Report on Form 10-K for the year ended July 31, 2014.
	Use of Estimates
	The preparation of the accompanying condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Those management estimates and assumptions affect revenue recognition, allowances for doubtful accounts and sales returns, valuation of our cash equivalents and available-for-sale investments, valuation of inventory, determination of fair value of stock-based awards, valuation of goodwill and intangible assets acquired, impairment of goodwill and other intangible assets, amortization of intangible assets, contingencies and litigation and accounting for income taxes, including the valuation reserve on deferred tax assets and uncertain tax positions. We evaluate our estimates and assumptions on an ongoing basis using historical experience and other factors and adjust those estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ from these estimates and assumptions, and those differences could be material to the condensed consolidated financial statements.
	Concentrations of Risk
	Financial instruments that potentially subject us to concentrations of credit risk consist of cash, cash equivalents, short-term investments, restricted cash and accounts receivable. Our cash, cash equivalents, short-term investments and restricted cash are invested in high-credit quality financial instruments with banks and financial institutions. Such deposits may be in excess of insured limits provided on such deposits.
	We mitigate credit risk in respect to accounts receivable by performing ongoing credit evaluations of our customers and maintaining a reserve for potential credit losses. In addition, we generally require our customers to prepay for maintenance and support services to mitigate the risk of uncollectible accounts receivable.
	Significant customers are those which represent more than 10% of our total net revenue or gross accounts receivable balance at each respective balance sheet date. For the three months ended January 31, 2015, no customer accounted for more than 10% of our total net revenue. For the six months ended January 31, 2015, Exclusive Networks Ltd., a distributor, accounted for 10.7% of our total net revenue. For the three months ended January 31, 2014, Exclusive Networks Ltd. accounted for 10.1% of our total net revenue. For the six months ended January 31, 2014, no customer represented more than10% of our total net revenue. No customer accounted for more than 10% of our total gross accounts receivable as of January 31, 2015. Exclusive Networks Ltd. accounted for 12.8% of our total gross accounts receivable as of July 31, 2014. We believe it is unlikely that the loss of any of our channel partners would have a long term material adverse effect on our total net revenue as we believe end-users would likely purchase our products from a different channel partner. However, a loss of any one of these channel partners could have a material adverse impact during the transition period.
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update
	(ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The guidance is effective for us in the first quarter of our 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 adoption methods and whether this standard will have a material impact on our condensed consolidated financial statements.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	6 Months Ended
	Jan. 31, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	NET INCOME (LOSS) PER SHARE
	We compute basic net income (loss) per share using the weighted average number of common shares outstanding during the period. We compute diluted net income (loss) per share using the weighted average number of common shares and dilutive potential common shares outstanding during the period. Dilutive potential common shares include shares issuable upon the exercise of stock options and upon the vesting of restricted stock units, or RSUs, and each purchase under our employee stock purchase plan, or ESPP, under the treasury stock method.
	In loss periods, basic net loss per share and diluted net loss per share are the same since the effect of potential common shares is anti-dilutive and therefore excluded.
	The following outstanding weighted-average shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive:
		Three Months Ended January 31,		Six Months ended January 31,
		2015	2014	2015	2014
		(In thousands)
	Stock options to purchase common stock	3,412	3,817	3,221	4,100
	Restricted stock units	1,946	1,859	2,229	1,736
	Employee Stock Purchase Plan	58	264	260	273

Cash_Equivalents_ShortTerm_Inv

Cash Equivalents, Short-Term Investments, Restricted Cash and Fair Value Measurements	6 Months Ended
	Jan. 31, 2015
Financial Instruments, Owned, at Fair Value [Abstract]
Cash Equivalents, Short-term Investments, Restricted Cash and Fair Value Measurements	CASH EQUIVALENTS, SHORT-TERM INVESTMENTS, RESTRICTED CASH AND FAIR VALUE MEASUREMENTS
	Cash Equivalents, Short-term Investments and Restricted Cash
	The following table summarizes our cash equivalents, short-term investments and restricted cash as of January 31, 2015:
		Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
		(In thousands)
	Cash equivalents:
	Money market funds	$	5,559	$	—	$	—		$	5,559
	Short-term investments:
	U.S. Treasury securities	143,921		62		(29		)	143,954
	U.S. government agency securities	40,855		26		(3		)	40,878
	FDIC-backed certificates of deposit	20,840		7		(51		)	20,796
	Total short-term investments	205,616		95		(83		)	205,628
	Restricted cash:
	Money market funds	3,417		—		—			3,417
	Total cash equivalents, short-term investments and restricted cash	$	214,592	$	95	$	(83	)	$	214,604
	The following table presents the contractual maturities of our short-term investments which are classified as available-for-sale securities as of January 31, 2015:
		Amortized Cost		Estimated Fair Value
		(In thousands)
	Due within one year	$	113,910	$	113,918
	Due after one year through two years	91,706		91,710
	Total	$	205,616	$	205,628
	We classify our available-for-sale investments as short-term investments in our condensed consolidated balance sheet based on the availability of the funds for use in operations or strategic investments rather than the actual maturity dates.
	The following table summarizes our cash equivalents, short-term investments and restricted cash as of July 31, 2014:
		Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
		(In thousands)
	Cash equivalents:
	Money market funds	$	7,550	$	—	$	—		$	7,550
	U.S. Treasury securities	2,000		—		—			2,000
	Total cash equivalents	9,550		—		—			9,550
	Short-term investments:
	U.S. Treasury securities	136,729		37		(65		)	136,701
	U.S. government agency securities	37,433		3		(53		)	37,383
	FDIC-backed certificates of deposit	17,240		4		(12		)	17,232
	Total short-term investments	191,402		44		(130		)	191,316
	Restricted cash:
	U.S. Treasury securities	3,413		2		—			3,415
	Total cash equivalents, short-term investments and restricted cash	$	204,365	$	46	$	(130	)	$	204,281
	Fair Value Measurements
	The following table sets forth the fair value of our financial assets by level within the fair value hierarchy:
		Fair Value Measurements at January 31, 2015 Using:
		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
		(Level I)		(Level II)		(Level III)			Total
		(In thousands)
	Financial Assets
	Cash equivalents:
	Money market funds	$	5,559	$	—	$	—		$	5,559
	Short-term investments:
	U.S. Treasury securities	143,954		—		—			143,954
	U.S. government agency securities	—		40,878		—			40,878
	FDIC-backed certificates of deposit	—		20,796		—			20,796
	Total short-term investments	143,954		61,674		—			205,628
	Restricted cash:
	Money market funds	3,417		—		—			3,417
	Total financial assets	$	152,930	$	61,674	$	—		$	214,604
		Fair Value Measurements at July 31, 2014 Using:
		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
		(Level I)		(Level II)		(Level III)			Total
		(In thousands)
	Financial Assets
	Cash equivalents:
	Money market funds	$	7,550	$	—	$	—		$	7,550
	U.S. Treasury securities	2,000		—		—			2,000
	Total cash equivalents	9,550		—		—			9,550
	Short-term investments:
U.S. Treasury securities	136,701		—		—			136,701
U.S. government agency securities	—		37,383		—			37,383
FDIC-backed certificates of deposit	—		17,232		—			17,232
Total short-term investments	136,701		54,615		—			191,316
Restricted cash:
U.S. Treasury securities	3,415		—		—			3,415
Total financial assets	$	149,666	$	54,615	$	—		$	204,281
We value our Level I assets, consisting of money market funds and U.S. Treasury securities, using quoted prices in active markets for identical instruments. Financial assets whose fair values we measure on a recurring basis using Level II inputs consist of U.S. government agency securities and Federal Deposit Insurance Corporation, or FDIC-backed certificates of deposit. We measure the fair values of these assets with the help of a pricing service that either provides quoted market prices in active markets for identical or similar securities or uses observable inputs for their pricing without applying significant adjustments because the inputs used in the valuation model, such as interest rates and volatility, can be corroborated by readily observable market data for substantially the full term of the financial assets.
There were no transfers between Level I, Level II and Level III fair value hierarchies during the three and six months ended January 31, 2015.

Inventory_and_Deferred_Revenue

Inventory and Deferred Revenue	6 Months Ended
	Jan. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventory and Deferred Revenue	INVENTORY AND DEFERRED REVENUE
	Inventory
	Inventory consists of the following:
		January 31, 2015		July 31, 2014
		(In thousands)
	Raw materials	$	789	$	474
	Finished goods	6,823		5,871
	Total inventory	$	7,612	$	6,345
	Deferred Revenue, Net
	Deferred revenue, net consists of the following:
		January 31, 2015		July 31, 2014
		(In thousands)
	Deferred revenue:
	Products and licenses	$	4,914	$	5,120
	Services	128,832		112,642
	Total deferred revenue	133,746		117,762
	Deferred cost of revenue:
	Products and licenses	346		449
	Services	2,048		1,200
	Total deferred cost of revenue	2,394		1,649
	Total deferred revenue, net	131,352		116,113
	Less current portion	92,837		81,964
	Non-current portion	$	38,515	$	34,149

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jan. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Contract Manufacturer Commitments
	The independent contract manufacturer that provides the substantial majority of our manufacturing, repair and supply chain operations procures components and builds our products based on our forecasts. These forecasts are based on estimates of future demand for our products, which are in turn based on historical trends and an analysis from our sales and marketing organizations, adjusted for overall market conditions. In order to reduce manufacturing lead times and plan for adequate component supply, we may issue purchase orders to this independent contract manufacturer which may not be cancelable. In addition, we also have purchase commitments with other third-party contract manufacturers and suppliers. As of January 31, 2015, we had $10.1 million in purchase commitments with our third-party contract manufacturers and suppliers, of which $7.3 million relates to open purchase orders with our primary independent contract manufacturer.
	Guarantees
	We have entered into agreements with some of our customers that contain indemnification provisions relating to potential situations where claims could be alleged that our products infringe the intellectual property rights of a third party. We have, at our option and expense, the ability to repair any infringement, replace the product with a non-infringing functionally equivalent product, or refund our customers the unamortized value of the product based on its estimated useful life, typically five years. Other guarantees or indemnification arrangements include guarantees of product and service performance and standby letters of credit for lease facilities and corporate credit cards. We have not recorded a liability related to these indemnification and guarantee provisions, and our guarantees and indemnification arrangements have not had any significant impact on our condensed consolidated financial statements to date.
	Loss Contingencies and Legal Proceedings
	We are subject to the possibility of various loss contingencies arising in the ordinary course of business. An estimated loss contingency is accrued when it is probable that an asset has been impaired or a liability has been incurred and the range of loss can be reasonably estimated. However, the actual loss in any such contingency may be materially different from our estimates, which could result in the need to record additional expenses. If the amount of liability is not probable or the amount cannot be reasonably estimated, no accruals have been made. We regularly evaluate current information available to management to determine whether such accruals should be adjusted and whether new accruals are required in the periods presented.
	From time to time, we are subject to various legal proceedings, claims and litigation arising in the ordinary course of business. Other than the litigation matters described below, as to which we are unable to make a materiality determination, we do not believe we are party to any currently pending legal proceedings, the outcome of which would have a material adverse effect on our financial position, results of operations or cash flows. There can be no assurance that existing or future legal proceedings arising in the ordinary course of business or otherwise will not have a material adverse effect on our financial position, results of operations or cash flows.
	Burnam v. Infoblox Inc., et al., Case No, 5:14-cv-05107-PSG (N.D. Cal). On November 19, 2014, a stockholder derivative lawsuit was filed in the United States District Court for the Northern District of California against current and former officers and directors of the Company, with the Company as a nominal defendant. The case was based on allegations similar to those in securities class action cases filed beginning May 30, 2014 (which class action cases have been voluntarily dismissed by the lead plaintiffs without prejudice) and asserts claims for breach of fiduciary duties, waste of corporate assets, insider trading and misappropriation of information, gross mismanagement, and unjust enrichment.  On December 10, 2014, the plaintiff voluntarily dismissed the claims without prejudice.
	On April 16, 2013, Versata Software, Inc., or Versata, filed suit against us in the United States District Court for the District of Delaware in an action captioned Versata Software, Inc. F/K/A Trilogy Software, Inc.; and Versata Development Group, Inc. F/K/A Trilogy Development Group, Inc. v. Infoblox, Inc., Case No 1:13-cv-00678-UNA (D.Del.) (the “Action”).  In the Action, Versata alleges that we directly and/or indirectly infringed U.S. Patent Nos. 6,834,282; 6,907,414; 7,363,593 and 7,426,481 by making, using, licensing, selling and offering for sale software products and related services including but not limited to Infoblox IP Address Management. In December 2013, we filed a motion to dismiss the Action. A hearing was held on the motion in August 2014 and the parties are awaiting the ruling on the motion. We continue to believe we have meritorious defenses to the claims asserted in these actions and intend to defend vigorously against them.
	We believe at this time that liabilities associated with these cases, while possible, are not probable, and therefore we have not recorded any accrual for them as of January 31, 2015 and July 31, 2014. Further, any possible range of loss cannot be reasonably estimated at this time.

Business_Acquisition

Business Acquisition	6 Months Ended
	Jan. 31, 2015
Business Combinations [Abstract]
Business Acquisition	BUSINESS ACQUISITION
	In December 2013, we acquired substantially all of the assets of Internet Associates LLC, or IA, a small privately held software company that specialized in the automation of IP address management and IPv6, for a total consideration of $1.6 million. Of this amount, $1.0 million was paid in cash and $0.6 million represented the fair value of fully vested RSUs issued to former IA employees hired by us in connection with the acquisition. Of the total purchase price of $1.6 million, $1.0 million was allocated to the fair value of the core/developed technology and $0.6 million was allocated to the fair value of goodwill. We are amortizing the developed technology on a straight-line basis over an estimated useful life of 7 years. Amortization expense for this intangible asset was insignificant for the three and six months ended January 31, 2015 and 2014.

Stockholders_Equity_and_Employ

Stockholders’ Equity and Employee Benefit Plans	6 Months Ended
	Jan. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity and Employee Benefit Plans	STOCKHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS
	Stock-based Compensation
	The following table summarizes stock-based compensation expense for stock option grants, ESPP purchase rights and restricted stock units recorded in our condensed consolidated statements of operations:
		Three Months Ended January 31,						Six Months ended January 31,
		2015			2014			2015				2014
		(In thousands)
	Cost of revenue	$	1,201		$	960		$	2,404			$	1,664
	Research and development	2,633			1,911			5,241				3,583
	Sales and marketing	5,847			5,876			12,195				11,068
	General and administrative	2,436			1,677			4,499				3,150
		$	12,117		$	10,424		$	24,339			$	19,465
	The following table summarizes stock-based compensation expense by award type:
		Three Months Ended January 31,						Six Months ended January 31,
		2015			2014			2015				2014
		(In thousands)
	RSUs	$	7,846		$	6,106		$	15,284			$	10,877
	Stock options	2,448			3,377			5,154				6,445
	ESPP	1,823			941			3,901				2,143
		$	12,117		$	10,424		$	24,339			$	19,465
	The following table summarizes the unrecognized stock-based compensation balance, net of estimated forfeitures, by type of awards as of January 31, 2015:
			As of January 31, 2015			Weighted-Average Amortization Period
			(In thousands)			(In years)
	RSUs		$	70,056		2.6
	Stock options		13,896			2.33
	ESPP		5,668			1.04
	Total unrecognized stock-based compensation balance		$	89,620		2.46
	Determination of Fair Value
	The fair value of stock option grants and ESPP purchase rights was estimated at the date of grant and start of the offering period using the following assumptions:
		Three Months Ended January 31,						Six Months ended January 31,
		2015			2014			2015				2014
	Stock Options:
	Expected term (in years)	6.08			6.08			6.08				6.08
	Risk-free interest rate	1.73		%	1.87		%	1.8		%		1.84		%
	Expected volatility	55		%	54		%	56		%		54		%
	Dividend rate	—		%	—		%	—		%		—		%
	Weighted average fair value per share	$	9.4		$	15.9		$	8.66			$	19.81
	Employee Stock Purchase Plan:
	Expected term (in years)	0.50 - 2.00			0.50 - 2.00			0.50 - 2.00				0.50 - 2.00
	Risk-free interest rate	0.16% - 0.71%			0.09% - 0.38%			0.16% - 0.71%				0.09% - 0.38%
	Expected volatility	71		%	55% - 67%			71		%		55% - 67%
	Dividend rate	—		%	—		%	—		%		—		%
	Weighted average fair value per share	$	9.04		$	12.87		$	9.04			$	12.87
	Stock Option Activity
	A summary of the stock option activity under our stock plans during the six months ended January 31, 2015 is presented below:
			Number of		Weighted-			Weighted-		Aggregate Intrinsic Value
			Shares		Average			Average
			Underlying		Exercise Price			Remaining
			Outstanding					Contractual
			Options					Term
			(In thousands)					(In years)		(In thousands)
	Outstanding as of July 31, 2014		4,914		$	12.52		6.67		$	14,980
	Granted		713		$	16.18
	Exercised		(587	)	$	9.34
	Canceled due to forfeitures		(293	)	$	17.65
	Outstanding as of January 31, 2015		4,747		$	13.15		6.67		$	34,103
	Vested and expected to vest as of January 31, 2015		4,597		$	12.95		6.6		$	33,710
	Vested and exercisable as of January 31, 2015		2,977		$	10.67		5.61		$	27,691
	Restricted Stock Unit Activity
	A summary of the restricted stock unit activity during the six months ended January 31, 2015 is presented below:
			Number of Units		Weighted-Average Grant Date Fair Value Per Share
			(In thousands)
	Outstanding as of July 31, 2014		3,442		$	26.47
	Granted		2,156		$	15.5
	Vested		(572	)	$	31.36
Cancellations due to forfeitures		(493	)	$	24.12
Outstanding as of January 31, 2015		4,533		$	20.89

Income_Taxes

Income Taxes	6 Months Ended
	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	The income tax benefits for the three months ended January 31, 2015 and 2014 were $0.2 million and $0.1 million, which consisted of favorable adjustments to the federal income taxes recorded in the first fiscal quarters of 2015 and 2014, partially offset by state and foreign income taxes.
	The provisions for income taxes for the six months ended January 31, 2015 and 2014 were $0.6 million and $0.5 million, which primarily consisted of state and foreign income taxes. The increase in the provision for income taxes for the six months ended January 31, 2015 compared to the same period in the prior year was principally attributable to higher federal and state income taxes as a result of higher projected fiscal 2015 taxable income.
	For the three and six months ended January 31, 2015 and 2014, our provisions for income taxes differed from the statutory amount primarily due to U.S. and foreign taxes currently payable as we realized no benefit for current year losses due to maintaining a full valuation allowance against net U.S. deferred tax assets. For the three and six months ended January 31, 2015, we also maintained a full valuation allowance against net Canadian deferred tax assets.
	The realization of tax benefits of deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are expected to be deductible or taxable. Based on the available objective evidence, management does not believe it is more likely than not that the net U.S. and Canadian deferred tax assets will be realizable. Accordingly, we have provided a full valuation allowance against net U.S. and Canadian deferred tax assets as of January 31, 2015 and July 31, 2014. We intend to maintain the valuation allowance until sufficient positive evidence exists to support a reversal of, or decrease in, the valuation allowance. During the three and six months ended January 31, 2015, there have been no material changes to the total amount of unrecognized tax benefits.

Segment_Information

Segment Information	6 Months Ended
	Jan. 31, 2015
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION
	We operate in one single segment. The following table represents net revenue based on the customer’s location, as determined by the customer’s shipping address:
		Three Months Ended January 31,				Six Months ended January 31,
		2015		2014		2015		2014
		(In thousands)
	Americas	$	46,578	$	40,343	$	91,428	$	83,646
	Europe, Middle East and Africa ("EMEA")	19,228		13,822		35,125		27,800
	Asia Pacific ("APAC")	8,498		6,717		14,470		12,957
	Total net revenue	$	74,304	$	60,882	$	141,023	$	124,403
	Included within the Americas total in the above table is revenue from sales in the United States of $44.1 million and $38.1 million for the three months ended January 31, 2015 and 2014 and $86.3 million and $78.5 million for the six months ended January 31, 2015 and 2014. No other country comprised more than 10% of our net revenue for the three months ended January 31, 2015 and 2014.
	Our property and equipment, net by location is summarized as follows:
		January 31, 2015		July 31, 2014
		(In thousands)
	Americas	$	17,806	$	17,882
	EMEA	646		669
	APAC	319		234
	Total property and equipment, net	$	18,771	$	18,785
	Included within the Americas total in the above table is property and equipment, net in the United States of $17.8 million and $17.8 million as of January 31, 2015 and July 31, 2014.

Description_of_the_Business_an1

Description of the Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jan. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The condensed consolidated financial statements include our accounts and the accounts of our wholly-owned subsidiaries. Intercompany transactions and balances have been eliminated. The accompanying condensed consolidated balance sheet as of January 31, 2015 and the condensed consolidated statements of operations and the condensed consolidated statements of comprehensive loss for the three and six months ended January 31, 2015 and 2014 and the condensed consolidated statements of cash flows for the six months ended January 31, 2015 and 2014 are unaudited. The condensed consolidated balance sheet as of July 31, 2014 was derived from the audited consolidated balance sheet as of July 31, 2014. These unaudited condensed consolidated financial statements and accompanying notes should be read together with the audited consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the fiscal year ended July 31, 2014.
	The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP, pursuant to the rules and regulations of the Securities Exchange Commission, or SEC. They do not include all of the financial information and footnotes required by GAAP for complete financial statements. We believe the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited financial statements and include all adjustments necessary for the fair presentation of our balance sheet as of January 31, 2015, our results of operations and comprehensive loss for the three and six months ended January 31, 2015 and 2014 and cash flows for the six months ended January 31, 2015 and 2014. All adjustments are of a normal recurring nature. The results for the three and six months ended January 31, 2015 are not necessarily indicative of the results to be expected for any subsequent quarter or for the year ending July 31, 2015.
Use of Estimates	Use of Estimates
	The preparation of the accompanying condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Those management estimates and assumptions affect revenue recognition, allowances for doubtful accounts and sales returns, valuation of our cash equivalents and available-for-sale investments, valuation of inventory, determination of fair value of stock-based awards, valuation of goodwill and intangible assets acquired, impairment of goodwill and other intangible assets, amortization of intangible assets, contingencies and litigation and accounting for income taxes, including the valuation reserve on deferred tax assets and uncertain tax positions. We evaluate our estimates and assumptions on an ongoing basis using historical experience and other factors and adjust those estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ from these estimates and assumptions, and those differences could be material to the condensed consolidated financial statements.
Concentrations of Risk	Concentrations of Risk
	Financial instruments that potentially subject us to concentrations of credit risk consist of cash, cash equivalents, short-term investments, restricted cash and accounts receivable. Our cash, cash equivalents, short-term investments and restricted cash are invested in high-credit quality financial instruments with banks and financial institutions. Such deposits may be in excess of insured limits provided on such deposits.
	We mitigate credit risk in respect to accounts receivable by performing ongoing credit evaluations of our customers and maintaining a reserve for potential credit losses. In addition, we generally require our customers to prepay for maintenance and support services to mitigate the risk of uncollectible accounts receivable.
	Significant customers are those which represent more than 10% of our total net revenue or gross accounts receivable balance at each respective balance sheet date. For the three months ended January 31, 2015, no customer accounted for more than 10% of our total net revenue. For the six months ended January 31, 2015, Exclusive Networks Ltd., a distributor, accounted for 10.7% of our total net revenue. For the three months ended January 31, 2014, Exclusive Networks Ltd. accounted for 10.1% of our total net revenue. For the six months ended January 31, 2014, no customer represented more than10% of our total net revenue. No customer accounted for more than 10% of our total gross accounts receivable as of January 31, 2015. Exclusive Networks Ltd. accounted for 12.8% of our total gross accounts receivable as of July 31, 2014. We believe it is unlikely that the loss of any of our channel partners would have a long term material adverse effect on our total net revenue as we believe end-users would likely purchase our products from a different channel partner. However, a loss of any one of these channel partners could have a material adverse impact during the transition period.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update
	(ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The guidance is effective for us in the first quarter of our 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 adoption methods and whether this standard will have a material impact on our condensed consolidated financial statements.

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jan. 31, 2015
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following outstanding weighted-average shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive:
		Three Months Ended January 31,		Six Months ended January 31,
		2015	2014	2015	2014
		(In thousands)
	Stock options to purchase common stock	3,412	3,817	3,221	4,100
	Restricted stock units	1,946	1,859	2,229	1,736
	Employee Stock Purchase Plan	58	264	260	273

Cash_Equivalents_ShortTerm_Inv1

Cash Equivalents, Short-Term Investments, Restricted Cash and Fair Value Measurements (Tables)	6 Months Ended
	Jan. 31, 2015
Financial Instruments, Owned, at Fair Value [Abstract]
Schedule Cash Equivalents, Short-term Investments and Restricted Cash	The following table summarizes our cash equivalents, short-term investments and restricted cash as of July 31, 2014:
		Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
		(In thousands)
	Cash equivalents:
	Money market funds	$	7,550	$	—	$	—		$	7,550
	U.S. Treasury securities	2,000		—		—			2,000
	Total cash equivalents	9,550		—		—			9,550
	Short-term investments:
	U.S. Treasury securities	136,729		37		(65		)	136,701
	U.S. government agency securities	37,433		3		(53		)	37,383
	FDIC-backed certificates of deposit	17,240		4		(12		)	17,232
	Total short-term investments	191,402		44		(130		)	191,316
	Restricted cash:
	U.S. Treasury securities	3,413		2		—			3,415
	Total cash equivalents, short-term investments and restricted cash	$	204,365	$	46	$	(130	)	$	204,281
	The following table summarizes our cash equivalents, short-term investments and restricted cash as of January 31, 2015:
		Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
		(In thousands)
	Cash equivalents:
	Money market funds	$	5,559	$	—	$	—		$	5,559
	Short-term investments:
	U.S. Treasury securities	143,921		62		(29		)	143,954
	U.S. government agency securities	40,855		26		(3		)	40,878
	FDIC-backed certificates of deposit	20,840		7		(51		)	20,796
	Total short-term investments	205,616		95		(83		)	205,628
	Restricted cash:
	Money market funds	3,417		—		—			3,417
	Total cash equivalents, short-term investments and restricted cash	$	214,592	$	95	$	(83	)	$	214,604
Investments Classified by Contractual Maturity Date	The following table presents the contractual maturities of our short-term investments which are classified as available-for-sale securities as of January 31, 2015:
		Amortized Cost		Estimated Fair Value
		(In thousands)
	Due within one year	$	113,910	$	113,918
	Due after one year through two years	91,706		91,710
	Total	$	205,616	$	205,628
Schedule of Fair Value of Assets and Liabilities by Level	The following table sets forth the fair value of our financial assets by level within the fair value hierarchy:
		Fair Value Measurements at January 31, 2015 Using:
		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
		(Level I)		(Level II)		(Level III)			Total
		(In thousands)
	Financial Assets
	Cash equivalents:
	Money market funds	$	5,559	$	—	$	—		$	5,559
	Short-term investments:
	U.S. Treasury securities	143,954		—		—			143,954
	U.S. government agency securities	—		40,878		—			40,878
	FDIC-backed certificates of deposit	—		20,796		—			20,796
	Total short-term investments	143,954		61,674		—			205,628
	Restricted cash:
	Money market funds	3,417		—		—			3,417
	Total financial assets	$	152,930	$	61,674	$	—		$	214,604
		Fair Value Measurements at July 31, 2014 Using:
		Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
		(Level I)		(Level II)		(Level III)			Total
		(In thousands)
	Financial Assets
	Cash equivalents:
	Money market funds	$	7,550	$	—	$	—		$	7,550
	U.S. Treasury securities	2,000		—		—			2,000
	Total cash equivalents	9,550		—		—			9,550
	Short-term investments:
	U.S. Treasury securities	136,701		—		—			136,701
	U.S. government agency securities	—		37,383		—			37,383
	FDIC-backed certificates of deposit	—		17,232		—			17,232
	Total short-term investments	136,701		54,615		—			191,316
	Restricted cash:
	U.S. Treasury securities	3,415		—		—			3,415
	Total financial assets	$	149,666	$	54,615	$	—		$	204,281

Inventory_and_Deferred_Revenue1

Inventory and Deferred Revenue (Tables)	6 Months Ended
	Jan. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Inventory	Inventory consists of the following:
		January 31, 2015		July 31, 2014
		(In thousands)
	Raw materials	$	789	$	474
	Finished goods	6,823		5,871
	Total inventory	$	7,612	$	6,345
Schedule of Deferred Revenue, Net	Deferred revenue, net consists of the following:
		January 31, 2015		July 31, 2014
		(In thousands)
	Deferred revenue:
	Products and licenses	$	4,914	$	5,120
	Services	128,832		112,642
	Total deferred revenue	133,746		117,762
	Deferred cost of revenue:
	Products and licenses	346		449
	Services	2,048		1,200
	Total deferred cost of revenue	2,394		1,649
	Total deferred revenue, net	131,352		116,113
	Less current portion	92,837		81,964
	Non-current portion	$	38,515	$	34,149

Stockholders_Equity_and_Employ1

Stockholders’ Equity and Employee Benefit Plans (Tables)	6 Months Ended
	Jan. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock-based Compensation by Statement of Operations	The following table summarizes stock-based compensation expense for stock option grants, ESPP purchase rights and restricted stock units recorded in our condensed consolidated statements of operations:
		Three Months Ended January 31,						Six Months ended January 31,
		2015			2014			2015				2014
		(In thousands)
	Cost of revenue	$	1,201		$	960		$	2,404			$	1,664
	Research and development	2,633			1,911			5,241				3,583
	Sales and marketing	5,847			5,876			12,195				11,068
	General and administrative	2,436			1,677			4,499				3,150
		$	12,117		$	10,424		$	24,339			$	19,465
	The following table summarizes stock-based compensation expense by award type:
		Three Months Ended January 31,						Six Months ended January 31,
		2015			2014			2015				2014
		(In thousands)
	RSUs	$	7,846		$	6,106		$	15,284			$	10,877
	Stock options	2,448			3,377			5,154				6,445
	ESPP	1,823			941			3,901				2,143
		$	12,117		$	10,424		$	24,339			$	19,465
Schedule of Unrecognized Stock-Based Compensation Balance	The following table summarizes the unrecognized stock-based compensation balance, net of estimated forfeitures, by type of awards as of January 31, 2015:
			As of January 31, 2015			Weighted-Average Amortization Period
			(In thousands)			(In years)
	RSUs		$	70,056		2.6
	Stock options		13,896			2.33
	ESPP		5,668			1.04
	Total unrecognized stock-based compensation balance		$	89,620		2.46
Schedule of Determination of Fair Value	The fair value of stock option grants and ESPP purchase rights was estimated at the date of grant and start of the offering period using the following assumptions:
		Three Months Ended January 31,						Six Months ended January 31,
		2015			2014			2015				2014
	Stock Options:
	Expected term (in years)	6.08			6.08			6.08				6.08
	Risk-free interest rate	1.73		%	1.87		%	1.8		%		1.84		%
	Expected volatility	55		%	54		%	56		%		54		%
	Dividend rate	—		%	—		%	—		%		—		%
	Weighted average fair value per share	$	9.4		$	15.9		$	8.66			$	19.81
	Employee Stock Purchase Plan:
	Expected term (in years)	0.50 - 2.00			0.50 - 2.00			0.50 - 2.00				0.50 - 2.00
	Risk-free interest rate	0.16% - 0.71%			0.09% - 0.38%			0.16% - 0.71%				0.09% - 0.38%
	Expected volatility	71		%	55% - 67%			71		%		55% - 67%
	Dividend rate	—		%	—		%	—		%		—		%
	Weighted average fair value per share	$	9.04		$	12.87		$	9.04			$	12.87
Schedule of Stock-Based Compensation Activity	A summary of the stock option activity under our stock plans during the six months ended January 31, 2015 is presented below:
			Number of		Weighted-			Weighted-		Aggregate Intrinsic Value
			Shares		Average			Average
			Underlying		Exercise Price			Remaining
			Outstanding					Contractual
			Options					Term
			(In thousands)					(In years)		(In thousands)
	Outstanding as of July 31, 2014		4,914		$	12.52		6.67		$	14,980
	Granted		713		$	16.18
	Exercised		(587	)	$	9.34
	Canceled due to forfeitures		(293	)	$	17.65
	Outstanding as of January 31, 2015		4,747		$	13.15		6.67		$	34,103
	Vested and expected to vest as of January 31, 2015		4,597		$	12.95		6.6		$	33,710
	Vested and exercisable as of January 31, 2015		2,977		$	10.67		5.61		$	27,691
Schedule of Restricted Stock Units Award Activity	A summary of the restricted stock unit activity during the six months ended January 31, 2015 is presented below:
			Number of Units		Weighted-Average Grant Date Fair Value Per Share
			(In thousands)
	Outstanding as of July 31, 2014		3,442		$	26.47
	Granted		2,156		$	15.5
	Vested		(572	)	$	31.36
	Cancellations due to forfeitures		(493	)	$	24.12
	Outstanding as of January 31, 2015		4,533		$	20.89

Segment_Information_Tables

Segment Information (Tables)	6 Months Ended
	Jan. 31, 2015
Segment Reporting [Abstract]
Revenue from External Customers by Geographic Areas	We operate in one single segment. The following table represents net revenue based on the customer’s location, as determined by the customer’s shipping address:
		Three Months Ended January 31,				Six Months ended January 31,
		2015		2014		2015		2014
		(In thousands)
	Americas	$	46,578	$	40,343	$	91,428	$	83,646
	Europe, Middle East and Africa ("EMEA")	19,228		13,822		35,125		27,800
	Asia Pacific ("APAC")	8,498		6,717		14,470		12,957
	Total net revenue	$	74,304	$	60,882	$	141,023	$	124,403
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Our property and equipment, net by location is summarized as follows:
		January 31, 2015		July 31, 2014
		(In thousands)
	Americas	$	17,806	$	17,882
	EMEA	646		669
	APAC	319		234
	Total property and equipment, net	$	18,771	$	18,785

Description_of_the_Business_an2

Description of the Business and Summary of Significant Accounting Policies (Details)	3 Months Ended	6 Months Ended		3 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Revenue [Member]
Organization [Line Items]
Concentration risk percentage	0.00%	0.00%
Accounts Receivable [Member]
Organization [Line Items]
Concentration risk percentage			0.00%
Exclusive Networks [Member] | Revenue [Member]
Organization [Line Items]
Concentration risk percentage			10.70%	10.10%
Exclusive Networks [Member] | Accounts Receivable [Member]
Organization [Line Items]
Concentration risk percentage		12.80%

Net_Income_Loss_Per_Share_Deta

Net Income (Loss) Per Share (Details)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3,412	3,817	3,221	4,100
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	1,946	1,859	2,229	1,736
Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	58	264	260	273

Cash_Equivalents_ShortTerm_Inv2

Cash Equivalents, Short-Term Investments, Restricted Cash and Fair Value Measurements (Available-for-sale Securities) (Details) (USD $)	Jan. 31, 2015	Jul. 31, 2014
In Thousands, unless otherwise specified
Cash equivalents [Abstract]
Cash equivalents, Amortized Cost		$9,550
Cash equivalents, Unrealized Gains		0
Cash equivalents, Unrealized Losses		0
Cash equivalents, Estimated Fair Value		9,550
Short-term investments [Abstract]
Short-term investments, Amortized Cost	205,616	191,402
Short-term investments, Gross Unrealized Gain	95	44
Short-term investments, Gross Unrealized Losses	-83	-130
Short-term investments	205,628	191,316
Restricted Cash [Abstract]
Total cash equivalents and short-term investments, Amortized Cost	214,592	204,365
Total cash equivalents and short-term investments, Unrealized Gains	95	46
Total cash equivalents and short-term investments, Unrealized Losses	-83	-130
Total cash equivalents and short-term investments, Estimated Fair Value	214,604	204,281
Amortized Cost
Amortized cost, Due within one year	113,910
Amortized cost, Due between one to two years	91,706
Amortized cost, Total	205,616
Estimated Fair Value
Estimated Fair Value, Due within one year	113,918
Estimated Fair Value, Due between one to two years	91,710
Estimated Fair Value, Total	205,628
US Treasury Securities [Member]
Short-term investments [Abstract]
Short-term investments, Amortized Cost	143,921	136,729
Short-term investments, Gross Unrealized Gain	62	37
Short-term investments, Gross Unrealized Losses	-29	-65
Short-term investments	143,954	136,701
Restricted Cash [Abstract]
Restricted cash, Amortized Costs Basis		3,413
Restricted cash, Gross Unrealized Gains		2
Restricted cash, Gross Unrealized Losses		0
Restricted cash, Fair Value Disclosure		3,415
US Government Agencies Securities [Member]
Short-term investments [Abstract]
Short-term investments, Amortized Cost	40,855	37,433
Short-term investments, Gross Unrealized Gain	26	3
Short-term investments, Gross Unrealized Losses	-3	-53
Short-term investments	40,878	37,383
FDIC-backed certificates of deposit [Member]
Short-term investments [Abstract]
Short-term investments, Amortized Cost	20,840	17,240
Short-term investments, Gross Unrealized Gain	7	4
Short-term investments, Gross Unrealized Losses	-51	-12
Short-term investments	20,796	17,232
Money Market Funds [Member]
Restricted Cash [Abstract]
Restricted cash, Amortized Costs Basis	3,417
Restricted cash, Gross Unrealized Gains	0
Restricted cash, Gross Unrealized Losses	0
Restricted cash, Fair Value Disclosure	3,417
Money Market Funds [Member]
Cash equivalents [Abstract]
Cash equivalents, Amortized Cost	5,559	7,550
Cash equivalents, Unrealized Gains	0	0
Cash equivalents, Unrealized Losses	0	0
Cash equivalents, Estimated Fair Value	5,559	7,550
US Treasury Securities [Member]
Cash equivalents [Abstract]
Cash equivalents, Amortized Cost		2,000
Cash equivalents, Unrealized Gains		0
Cash equivalents, Unrealized Losses		0
Cash equivalents, Estimated Fair Value		$2,000

Cash_Equivalents_ShortTerm_Inv3

Cash Equivalents, Short-Term Investments, Restricted Cash and Fair Value Measurements (Schedule of the Fair Value of Assets and Liabilities by Level) (Details) (USD $)	Jan. 31, 2015	Jul. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		$9,550
Short-term investments	205,628	191,316
Total financial assets	214,604	204,281
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		9,550
Short-term investments	143,954	136,701
Total financial assets	152,930	149,666
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		0
Short-term investments	61,674	54,615
Total financial assets	61,674	54,615
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		0
Short-term investments	0	0
Total financial assets	0	0
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	143,954	136,701
Restricted cash		3,415
US Treasury Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	143,954	136,701
Restricted cash		3,415
US Treasury Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
US Treasury Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
US Government Agencies Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	40,878	37,383
US Government Agencies Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
US Government Agencies Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	40,878	37,383
US Government Agencies Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
FDIC-backed certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	20,796	17,232
FDIC-backed certificates of deposit [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
FDIC-backed certificates of deposit [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	20,796	17,232
FDIC-backed certificates of deposit [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	3,417
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	3,417
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	5,559	7,550
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	5,559	7,550
Money Market Funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Money Market Funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		2,000
US Treasury Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		2,000
US Treasury Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		0
US Treasury Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents		$0

Inventory_and_Deferred_Revenue2

Inventory and Deferred Revenue (Schedule of Inventory) (Details) (USD $)	Jan. 31, 2015	Jul. 31, 2014
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$789	$474
Finished goods	6,823	5,871
Total inventory	$7,612	$6,345

Inventory_and_Deferred_Revenue3

Inventory and Deferred Revenue (Schedule of Deferred Revenue) (Details) (USD $)	Jan. 31, 2015	Jul. 31, 2014
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$133,746	$117,762
Deferred cost of revenue	2,394	1,649
Total deferred revenue, net	131,352	116,113
Less current portion	92,837	81,964
Total deferred income taxes and other tax liabilities	38,515	34,149
Products and Licenses [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	4,914	5,120
Deferred cost of revenue	346	449
Services [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	128,832	112,642
Deferred cost of revenue	$2,048	$1,200

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jan. 31, 2015
Guarantor Obligations [Line Items]
Open purchase orders	10.1
Indemnification Agreement [Member]
Guarantor Obligations [Line Items]
Term of guarantee	5 years
Open Purchase Orders [Member]
Guarantor Obligations [Line Items]
Open purchase orders	7.3

Business_Acquisition_Details

Business Acquisition (Details) (USD $)	6 Months Ended		1 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Restricted stock units issued	$0	$573,000
Internet Associates LLC [Member]
Business Acquisition [Line Items]
Total consideration			1,600,000
Amount paid in cash			1,000,000
Restricted stock units issued			600,000
Goodwill acquired			600,000
Developed Technology Rights [Member] | Internet Associates LLC [Member]
Business Acquisition [Line Items]
Amount allocated to the core/developed technology			$1,000,000
Useful life			7 years

Stockholders_Equity_and_Employ2

Stockholders’ Equity and Employee Benefit Plans (Stock-based Compensation) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$12,117	$10,424	$24,339	$19,465
Total unrecognized stock-based compensation balance	89,620		89,620
Total unrecognized stock-based compensation balance, Weighted-average amortization			2 years 5 months 15 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	7,846	6,106	15,284	10,877
Total unrecognized stock-based compensation balance	70,056		70,056
Total unrecognized stock-based compensation balance, Weighted-average amortization			2 years 7 months 6 days
Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2,448	3,377	5,154	6,445
Total unrecognized stock-based compensation balance	13,896		13,896
Total unrecognized stock-based compensation balance, Weighted-average amortization			2 years 3 months 29 days
Employee Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,823	941	3,901	2,143
Total unrecognized stock-based compensation balance	5,668		5,668
Total unrecognized stock-based compensation balance, Weighted-average amortization			1 year 0 months 14 days
Cost of Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,201	960	2,404	1,664
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2,633	1,911	5,241	3,583
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	5,847	5,876	12,195	11,068
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$2,436	$1,677	$4,499	$3,150

Stockholders_Equity_and_Employ3

Stockholders’ Equity and Employee Benefit Plans (Determination of Fair Value) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		2 years
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 years 0 months 29 days	6 years 0 months 29 days	6 years 0 months 29 days	6 years 0 months 29 days
Risk-free interest rate	1.73%	1.87%	1.80%	1.84%
Expected volatility	55.00%	54.00%	56.00%	54.00%
Dividend rate	0.00%	0.00%	0.00%	0.00%
Weighted average fair value per share, stock options (in dollars per share)	$9.40	$15.90	$8.66	$19.81
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	71.00%		71.00%
Dividend rate	0.00%	0.00%	0.00%	0.00%
Weighted average fair value per share, stock options (in dollars per share)	$9.04	$12.87	$9.04	$12.87
Minimum [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 months	6 months	6 months	6 months
Risk-free interest rate	0.16%	0.09%	0.16%	0.09%
Expected volatility		55.00%		55.00%
Maximum [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	2 years		2 years	2 years
Risk-free interest rate	0.71%	0.38%	0.71%	0.38%
Expected volatility		67.00%		67.00%

Stockholders_Equity_and_Employ4

Stockholders’ Equity and Employee Benefit Plans (Stock Option Activities) (Details) (USD $)	6 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 31, 2015	Jul. 31, 2014
Number of Shares Underlying Outstanding Options [Roll Forward]
Number of Shares Underlying Outstanding Options, Beginning Balance	4,914,000
Number of Shares Underlying Outstanding Options, Granted	713,000
Number of Shares Underlying Outstanding Options, Exercised	-587,000
Number of Shares Underlying Outstanding Options, Canceled due to Forfeitures	-293,000
Number of Shares Underlying Outstanding Options, Ending Balance	4,747,000	4,914,000
Number of Shares Underlying Outstanding Options, Vested and Expected to Vest	4,597,000
Number of Shares Underlying Outstanding Options, Exercisable	2,977,000
Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$12.52
Weighted Average Exercise Price, Granted	$16.18
Weighted Average Exercise Price, Exercised	$9.34
Weighted Average Exercise Price, Canceled due to Forfeitures	$17.65
Weighted Average Exercise Price, Ending Balance	$13.15	$12.52
Weighted-Average Exercise Price, Vested and Expected to Vest	$12.95
Weighted-Average Exercise Price, Exercisable	$10.67
Weighted Average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term	6 years 8 months 1 day	6 years 8 months 1 day
Weighted-Average Remaining Contractual Term, Vested and Expected to Vest	6 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable	5 years 7 months 9 days
Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Outstanding	$34,103	$14,980
Aggregate Intrinsic Value, Vested and Expected to Vest	33,710
Aggregate Intrinsic Value, Exercisable	$27,691

Stockholders_Equity_and_Employ5

Stockholders’ Equity and Employee Benefit Plans (Restricted Stock Units Activities) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2015
Restricted Stock Units (RSUs) [Member]
Number of Units [Roll Forward]
Number of Units, Oustanding	3,442
Number of Units, Granted	2,156
Number of Units, Vested	-572
Number of Units, Cancellations due to forfeitures	-493
Number of Units, Oustanding	4,533
Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Outstanding	$26.47
Weighted Average Grant Date Fair Value, Granted	$15.50
Weighted Average Grant Date Fair Value, Vested	$31.36
Weighted Average Grant Date Fair Value, Cancellations due to forfeitures	$24.12
Weighted Average Grant Date Fair Value, Outstanding	$20.89

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	($200)	($92)	$620	$452

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Jul. 31, 2014
			segment
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments			1
Net revenue	$74,304	$60,882	$141,023	$124,403
Property and equipment, net	18,771		18,771		18,785
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	46,578	40,343	91,428	83,646
Property and equipment, net	17,806		17,806		17,882
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	19,228	13,822	35,125	27,800
Property and equipment, net	646		646		669
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	8,498	6,717	14,470	12,957
Property and equipment, net	319		319		234
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	44,100	38,100	86,300	78,500
Property and equipment, net	$17,800		$17,800		$17,800