Splunk (SPLK) 10-K 31 Mar 14 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Jan. 31, 2014	Mar. 24, 2014	Jul. 31, 2013
Document and Entity Information	'	'	'
Entity Registrant Name	'SPLUNK INC	'	'
Entity Central Index Key	'0001353283	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Jan-14	'	'
Amendment Flag	'false	'	'
Current Fiscal Year End Date	'--01-31	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$5,087,677,782
Entity Common Stock, Shares Outstanding	'	117,903,935	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'FY	'	'

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Jan. 31, 2014	Jan. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$897,453	$305,939
Accounts receivable, net	83,348	63,948
Prepaid expenses and other current assets	12,019	6,861
Total current assets	992,820	376,748
Property and equipment, net	15,505	13,205
Intangible assets, net	12,294	0
Goodwill	19,070	0
Other assets	642	492
Total assets	1,040,331	390,445
Current liabilities:	'	'
Accounts payable	2,079	1,632
Accrued payroll and compensation	43,876	28,123
Accrued expenses and other liabilities	12,743	7,636
Deferred revenue, current portion	149,156	79,568
Total current liabilities	207,854	116,959
Deferred revenue, non-current	43,165	35,144
Other liabilities, non-current	4,404	798
Total non-current liabilities	47,569	35,942
Total liabilities	255,423	152,901
Commitments and contingencies (Note 5)	'	'
Stockholders’ equity	'	'
Preferred stock: $0.001 par value; 20,000,000 shares authorized; no shares issued or outstanding at January 31, 2014; and no shares authorized, issued or outstanding at January 31, 2013	0	0
Common stock: $0.001 par value; 1,000,000,000 shares authorized; 116,099,516 shares issued and outstanding at January 31, 2014, and 100,920,350 shares issued and outstanding at January 31, 2013	116	101
Accumulated other comprehensive income (loss)	58	-135
Additional paid-in capital	954,441	328,277
Accumulated deficit	-169,707	-90,699
Total stockholders’ equity	784,908	237,544
Total liabilities and stockholders’ equity	$1,040,331	$390,445

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jan. 31, 2014	Jan. 31, 2013
Statement of Financial Position [Abstract]	'	'
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	116,099,516	100,920,350
Common stock, shares outstanding	116,099,516	100,920,350

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2012
Revenues	'		'		'
License	$199,024		$135,922		$88,308
Maintenance and services	103,599		63,022		32,652
Total revenues	302,623		198,944		120,960
Cost of revenues	'		'		'
License	330	[1]	727	[1]	890	[1]
Maintenance and services	35,495	[1]	20,697	[1]	10,715	[1]
Total cost of revenues	35,825	[1]	21,424	[1]	11,605	[1]
Gross profit	266,798		177,520		109,355
Operating expenses	'		'		'
Research and development	75,895	[1]	41,853	[1]	23,561	[1]
Sales and marketing	215,335	[1]	125,098	[1]	74,782	[1]
General and administrative	53,875	[1]	32,602	[1]	19,698	[1]
Total operating expenses	345,105	[1]	199,553	[1]	118,041	[1]
Operating loss	-78,307		-22,033		-8,686
Interest and other income (expense), net	'		'		'
Interest income (expense), net	225		152		-94
Other income (expense), net	-920		0		0
Change in fair value of preferred stock warrants	0		-14,087		-2,034
Total interest and other income (expense), net	-695		-13,935		-2,128
Loss before income taxes	-79,002		-35,968		-10,814
Provision for income taxes	6		713		178
Net loss	($79,008)		($36,681)		($10,992)
Basic and diluted net loss per share (in dollars per share)	($0.75)		($0.46)		($0.53)
Weighted-average shares used in computing basic and diluted net loss per share (in shares)	105,067		80,246		20,646
[1]	Amounts include stock-based compensation expense as follows: cost of revenues 5,283, 1,217, 134, research and development 20,829, 6,170, 841, sales and marketing 30,012, 8,093, 1,488, and general and administrative 13,244, 4,000, 1,297 for the years ended January 31, 2014, 2013, and 2012 respectively.

CONSOLIDATED_STATEMENTS_OF_OPE1

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Stock-based compensation expense	$69,368	$19,480	$3,760
Cost of revenues	'	'	'
Stock-based compensation expense	5,283	1,217	134
Research and development	'	'	'
Stock-based compensation expense	20,829	6,170	841
Sales and marketing	'	'	'
Stock-based compensation expense	30,012	8,093	1,488
General and administrative	'	'	'
Stock-based compensation expense	$13,244	$4,000	$1,297

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Statement of Comprehensive Income [Abstract]	'	'	'
Net loss	($79,008)	($36,681)	($10,992)
Other comprehensive loss:	'	'	'
Foreign currency translation adjustments	193	-111	-26
Comprehensive loss	($78,815)	($36,792)	($11,018)

CONSOLIDATED_STATEMENTS_OF_CON

CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (USD $)	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Convertible Preferred Stock Series A, B, C
In Thousands, except Share data, unless otherwise specified
Balances at Jan. 31, 2011	($36,503)	$19	$6,502	$2	($43,026)	$39,949
Balances (in shares) at Jan. 31, 2011	'	19,079,759	'	'	'	56,730,194
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'
Stock-based compensation	3,760	'	3,760	'	'	'
Issuance of common stock upon exercise of options	1,987	4	1,983	'	'	'
Issuance of common stock upon exercise of options (in shares)	'	3,595,080	'	'	'	'
Conversion of warrant liability to Series A convertible preferred stock upon exercise of warrant	'	'	'	'	'	914
Exercise of warrant to purchase Series A convertible preferred stock	0	'	0	'	'	50
Exercise of warrant to purchase Series A convertible preferred stock (in shares)	'	'	'	'	'	200,000
Conversion of preferred stock to common stock upon initial public offering	0	'	'	'	'	'
Issuance of common stock upon early exercise of options (in shares)	'	417,568	'	'	'	'
Vesting of early exercised options	128	'	128	'	'	'
Net change in cumulative translation adjustment	-26	'	'	-26	'	'
Net loss	-10,992	'	'	'	-10,992	'
Balances at Jan. 31, 2012	-41,646	23	12,373	-24	-54,018	40,913
Balances (in shares) at Jan. 31, 2012	'	23,092,407	'	'	'	56,930,194
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'
Stock-based compensation	19,480	'	19,480	'	'	'
Issuance of common stock upon exercise of options	6,896	6	6,890	'	'	'
Issuance of common stock upon exercise of options (in shares)	0	5,529,112	'	'	'	'
Conversion of preferred stock to common stock upon initial public offering	40,913	57	40,856	'	'	-40,913
Conversion of preferred stock to common stock upon initial public offering (in shares)	'	56,930,194	'	'	'	-56,930,194
Issuance of common stock in connection with offering	225,225	15	225,210	'	'	'
Issuance of common stock in connection with offering (in shares)	'	14,532,278	'	'	'	'
Issuance of common stock upon exercise of warrants	631	'	631	'	'	'
Issuance of common stock upon exercise of warrants (in shares)	'	466,714	'	'	'	'
Reclassification of preferred stock warrant liability to additional paid-in capital upon initial public offering	16,220	'	16,220	'	'	'
Vesting of early exercised options	845	'	845	'	'	'
Vesting of restricted stock units (in shares)	'	2,125	'	'	'	'
Common stock issued upon ESPP purchase	5,310	'	5,310	'	'	'
Common stock issued upon ESPP purchase (in shares)	'	367,520	'	'	'	'
Excess tax benefits from employee stock plans	462	'	462	'	'	'
Net change in cumulative translation adjustment	-111	'	'	-111	'	'
Net loss	-36,681	'	'	'	-36,681	'
Balances at Jan. 31, 2013	237,544	101	328,277	-135	-90,699	0
Balances (in shares) at Jan. 31, 2013	'	100,920,350	'	'	'	0
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'
Stock-based compensation	69,368	'	69,368	'	'	'
Issuance of common stock upon exercise of options	23,731	7	23,724	'	'	'
Issuance of common stock upon exercise of options (in shares)	0	7,254,049	'	'	'	'
Conversion of preferred stock to common stock upon initial public offering	0	'	'	'	'	'
Issuance of common stock in connection with offering	539,339	7	539,332	'	'	'
Issuance of common stock in connection with offering (in shares)	'	6,900,000	'	'	'	'
Vesting of early exercised options	112	'	112	'	'	'
Vesting of restricted stock units (in shares)	'	475,111	'	'	'	'
Taxes withholding related to net share settlement of equity awards	-18,156	'	-18,156	'	'	'
Common stock issued upon ESPP purchase	11,434	1	11,433	'	'	'
Common stock issued upon ESPP purchase (in shares)	'	550,006	'	'	'	'
Excess tax benefits from employee stock plans	351	'	351	'	'	'
Net change in cumulative translation adjustment	193	'	'	193	'	'
Net loss	-79,008	'	'	'	-79,008	'
Balances at Jan. 31, 2014	$784,908	$116	$954,441	$58	($169,707)	'
Balances (in shares) at Jan. 31, 2014	'	116,099,516	'	'	'	'

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities	'	'	'
Net loss	($79,008)	($36,681)	($10,992)
Adjustments to reconcile net loss to net cash provided by operating activities	'	'	'
Depreciation and amortization	6,692	4,674	2,120
Impairment of long-lived asset	2,128	0	0
Change in fair value of preferred stock warrants	0	14,087	2,034
Stock-based compensation expense	69,368	19,480	3,760
Deferred income taxes	-1,374	-281	0
Excess tax benefits from employee stock plans	-351	-462	0
Changes in operating assets and liabilities	'	'	'
Accounts receivable, net	-19,400	-29,453	-20,347
Prepaid expenses, other current and non-current assets	-6	-2,377	-3,511
Accounts payable	171	187	55
Accrued compensation	15,753	11,981	8,697
Accrued expenses and other liabilities	2,454	3,446	2,448
Deferred revenue	77,421	62,047	30,358
Net cash provided by operating activities	73,848	46,648	14,622
Cash flows from investing activities	'	'	'
Acquisitions, net of cash acquired	-29,738	0	0
Change in restricted cash	0	514	128
Purchases of property and equipment	-9,308	-9,077	-8,180
Net cash used in investing activities	-39,046	-8,563	-8,052
Cash flows from financing activities	'	'	'
Payments of financing obligation under sale leaseback	0	0	-173
Repayments of term debt	0	-2,289	-711
Proceeds from term debt	0	0	3,000
Proceeds from initial public offering, net of offering costs	0	225,225	0
Proceeds from exercise of warrant	0	631	50
Proceeds from early exercise of employee stock options	0	0	1,139
Proceeds from exercise of stock options	23,731	6,896	1,987
Excess tax benefits from employee stock plans	351	462	0
Proceeds from employee stock purchase plan	11,434	5,310	0
Proceeds from follow-on offering, net of offering costs	539,339	0	0
Taxes paid related to net share settlement of equity awards	-18,156	0	0
Net cash provided by financing activities	556,699	236,235	5,292
Effect of exchange rate changes on cash and cash equivalents	13	20	0
Net increase in cash and cash equivalents	591,514	274,340	11,862
Cash and cash equivalents	'	'	'
Beginning of period	305,939	31,599	19,737
End of period	897,453	305,939	31,599
Supplemental disclosures	'	'	'
Cash paid for interest	0	40	111
Cash paid for income taxes	490	118	0
Non-cash investing and financing activities	'	'	'
Accrued purchases of property and equipment	1,265	467	584
Conversion of preferred stock to common stock	0	40,913	0
Vesting of early exercised options	112	845	128
Conversion of warrant liability to Series A convertible preferred stock upon exercise of warrant	0	0	914
Deferred offering costs not yet paid	$344	$0	$1,339

Description_of_the_Business_an

Description of the Business and Significant Accounting Policies	12 Months Ended
	Jan. 31, 2014
Accounting Policies [Abstract]	'
Description of the Business and Significant Accounting Policies	'
	Description of the Business and Significant Accounting Policies
	Business
	Splunk Inc. (“we”, "us", "our") provides innovative software products that enable organizations to gain real-time operational intelligence by harnessing the value of their data. Our products enable users to collect, index, search, explore, monitor and analyze data regardless of format or source. Our products address large and diverse data sets commonly referred to as big data and are specifically tailored for machine-generated data. Machine data is produced by nearly every software application and electronic device in an organization and contains a definitive, time-stamped record of various activities, such as transactions, customer and user activities and security threats. Our products help users derive new insights from machine data that can be used to, among other things, improve service levels, reduce operational costs, mitigate security risks, demonstrate and maintain compliance, and drive better business decisions. Splunk was incorporated in California in October 2003 and was reincorporated in Delaware in May 2006.
	Fiscal Year
	Our fiscal year ends on January 31. References to fiscal 2014, for example, refer to the fiscal year ended January 31, 2014.
	Follow-on Offering
	In January 2014, we closed a follow-on offering of 6,900,000 shares of common stock, including 900,000 shares of common stock from the full exercise of the overallotment option of shares granted to the underwriters. The public offering price of the shares sold in the offering was $81.00 per share. The total gross proceeds from the offering to us were $558.9 million. After deducting underwriting discounts and commissions of $19.6 million, we received approximately $539.3 million.
	Use of Estimates
	The preparation of 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 financial statements and reported amounts of revenues and expenses during the reporting periods covered by the financial statements and accompanying notes. In particular, we make estimates with respect to the fair value of multiple elements in revenue recognition, uncollectible accounts receivable, the assessment of the useful life and recoverability of long-lived assets (property and equipment, goodwill and identified intangibles), stock-based compensation expense, the fair value of assets acquired and liabilities assumed for business combinations, income taxes and contingencies. Actual results could differ from those estimates.
	Segments
	We operate our business as one operating segment: the development and marketing of software products that enable our customers to gain real-time operational intelligence by harnessing the value of their data. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources.
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of Splunk Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated upon consolidation.
	Foreign Currency
	The functional currency of our foreign subsidiaries is the respective local currency. Translation adjustments arising from the use of differing exchange rates from period to period are included in Accumulated Other Comprehensive Loss within Stockholders' Equity. Foreign currency transaction gains and losses are included in Other Income (Expense), Net and were not material for the three years ended January 31, 2014. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenues and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates.
	Revenue Recognition
	We generate revenues primarily in the form of software license fees and related maintenance and services fees. License fees include perpetual license fees, term license fees and royalties. Maintenance and services primarily consist of fees for maintenance services (including support and unspecified upgrades and enhancements when and if they are available), training and professional services that are not essential to functionality.
	We recognize revenues when all of the following conditions are met:
	•	there is persuasive evidence of an arrangement;
	•	the software or services have been delivered to the customer;
	•	the amount of fees to be paid by the customer is fixed or determinable; and
	•	the collection of the related fees is probable.
	Signed agreements are used as evidence of an arrangement. If a contract signed by the customer does not exist, we use a purchase order as evidence of an arrangement. In cases where both a signed contract and a purchase order exist, we consider the signed contract to be the final persuasive evidence of an arrangement. Electronic delivery occurs when we provide the customer with access to the software via a license key. We assess whether a fee is fixed or determinable at the outset of the arrangement, primarily based on the payment terms associated with the transaction. We do not generally offer extended payment terms with typical terms of payment due between 30 and 60 days from delivery of software. We assess collectability of the fee based on a number of factors such as collection history and creditworthiness of the customer. If we determine that collectability is not probable, revenue is deferred until collectability becomes probable, generally upon receipt of cash.
	When contracts contain multiple elements wherein vendor specific objective evidence ("VSOE") exists for all undelivered elements and the services, if any, are not essential to the functionality of the delivered elements, we account for the delivered elements in accordance with the "Residual Method." Perpetual license arrangements are typically accompanied by maintenance agreements. Maintenance revenues consist of fees for providing software updates on a when and if available basis and technical support for software products ("post-contract support" or "PCS") for an initial term. Maintenance revenues are recognized ratably over the term of the agreement. We have established fair value for maintenance on perpetual licenses due to consistently priced standalone sales of maintenance. Revenues related to term license fees are recognized ratably over the contract term beginning on the date the customer has access to the software license key and continuing through the end of the contract term. In these cases we do not have VSOE of fair value for maintenance as fees for support and maintenance are bundled with the license over the entire term of the contract.
	License arrangements may also include professional services and training services, which are typically delivered early in the contract term. In determining whether professional services revenues should be accounted for separately from license revenues, we evaluate whether the professional services are considered essential to the functionality of the software using factors such as the nature of our software products; whether they are ready for use by the customer upon receipt; the nature of our implementation services, which typically do not involve significant customization to or development of the underlying software code; the availability of services from other vendors; whether the timing of payments for license revenues is coincident with performance of services; and whether milestones or acceptance criteria exist that affect the realizability of the software license fee. Substantially all of our professional services arrangements are billed on a time and materials basis and, accordingly, are recognized as the services are performed. Training revenues are recognized as training services are delivered. VSOE of fair value of professional and training services is based upon stand-alone sales of those services. Payments received in advance of services performed are deferred and recognized when the related services are performed.
	We are unable to establish VSOE of fair value for all undelivered elements in certain arrangements that include term licenses, maintenance and services, due to the lack of VSOE for maintenance bundled with the term license. In these instances, all revenue is recognized ratably over the period that the services are expected to be performed, commencing when all service periods have started. In arrangements where the expected service periods of maintenance services and professional or training services differ, we recognize all revenue over the longer of the expected service periods, which is generally the maintenance period.
	We do not offer credits or refunds and therefore have not recorded any sales return allowance for any of the periods presented. Upon a periodic review of outstanding accounts receivable, amounts that are deemed to be uncollectible are written off against the allowance for doubtful accounts. Our policy is to record revenues net of any applicable sales, use or excise taxes.
	We recognize revenues from the indirect sales channel upon sell-through by the partner or distributor. Sell-through is determined when we receive an order form from a reseller for a specific end-user sale. We do not offer right of return, product rotation or price protection to any of our channel partners. We also have licensing arrangements with OEM customers for which royalty fees are generally recognized as revenue upon receipt of reports of units shipped, respectively. Provided all other revenue criteria are met, the upfront, minimum, non-refundable license fees from OEM customers are recognized upon delivery, and on-going royalty fees are recognized upon reports of units shipped.
	In our consolidated statements of operations, revenues are categorized as license or maintenance and services revenues. We allocate revenues from arrangements containing multiple elements to each of these categories based on the VSOE of fair value for elements in each revenue arrangement and the application of the residual method for arrangements in which we have established VSOE of fair value for all undelivered elements. In arrangements where we are not able to establish VSOE of fair value for all undelivered elements, we first allocate revenues to any undelivered elements for which VSOE of fair value has been established, then allocate revenues to any undelivered elements for which VSOE of fair value has not been established based upon management's best estimate of fair value of those undelivered elements and apply a residual method to determine the license fee. Management's best estimate of fair value of undelivered elements for which VSOE of fair value has not been established is based upon the VSOE of similar offerings and other objective criteria.
	Deferred revenue consists substantially of amounts invoiced in advance of revenue recognition for our products and services described above. We recognize deferred revenue as revenue only when the revenue recognition criteria are met.
	Cash and Cash Equivalents and Restricted Cash
	We consider all highly liquid instruments with original or remaining maturities of 90 days or less at the date of purchase to be cash equivalents. Cash and cash equivalents are recorded at cost, which approximates fair value. We do not hold or issue financial instruments for trading purposes. As of January 31, 2014, 2013 and 2012, $864.0 million, $250.8 million and $19.5 million, respectively, of cash and cash equivalents were invested in money market funds.
	Concentration of Risk
	Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. We maintain the majority of our cash balance at one financial institution that management believes is a high-credit, quality financial institution and invest our cash equivalents in highly rated money market funds.
	At January 31, 2014, no customer represented greater than 10% of total accounts receivable. At January 31, 2013, there was one customer that represented approximately 31% of total accounts receivable.
	Our accounts receivable is subject to collection risks. Our gross accounts receivable is reduced for this risk by an allowance for doubtful accounts. This allowance is for estimated losses resulting from the inability of our customers to make required payments. It is an estimate and is regularly evaluated for adequacy by taking into consideration a combination of factors. We look at factors such as past collection experience, credit quality of the customer, age of the receivable balance, and current economic conditions. These factors are reviewed to determine whether an allowance for bad debts should be recorded to reduce the receivable balance to the amount believed to be collectible.
	The following table presents the changes in the allowance for doubtful accounts (in thousands):
		Fiscal Year Ended January 31,
	(in thousands)	2014			2013			2012
	Balance at beginning of period	$	821		$	557		$	400
	Add: bad debt expense	140			286			247
	Less: write-offs, net of recoveries	(203		)	(22		)	(90		)
	Balance at end of period	$	758		$	821		$	557
	Fair Value of Financial Instruments
	The carrying amounts of certain of our financial instruments including cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term maturities.
	Assets and liabilities recorded at fair value in the financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, which are directly related to the amount of subjectivity, associated with the inputs to the valuation of these assets or liabilities are as follows:
	Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities.
	Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and considers factors specific to the asset or liability. Our convertible preferred stock warrant liability was classified within Level 3 of the fair value hierarchy.
	Goodwill, Intangible Assets, Long-Lived Assets and Impairment Assessments
	Goodwill and indefinite-lived intangible assets are carried at cost and are evaluated annually for impairment, or more frequently if circumstances exist that indicate that impairment may exist. When conducting our annual goodwill impairment assessment, we perform a quantitative evaluation of whether goodwill is impaired using the two-step impairment test. The first step is comparing the fair value of our reporting unit to its carrying value. We consider the enterprise to be the reporting unit for this analysis. If step one indicates that impairment potentially exists, the second step is performed to measure the amount of impairment, if any. We record the amount by which the carrying value of the goodwill exceeds its implied fair value, if any, as impairment.
	Finite-lived intangible assets are amortized over their useful lives. Each period we evaluate the estimated remaining useful life our finite-lived intangible assets and whether events or changes in circumstances warrant a revision to the remaining period of amortization. The carrying amounts of these assets are periodically reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparison of the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate. If the undiscounted cash flows used in the test for recoverability are less than the carrying amount of these assets then the carrying amount of such assets is reduced to fair value.
	In-process research and development is initially capitalized at fair value as an intangible asset with an indefinite life and assessed for impairment thereafter. When in-process research and development projects are completed, the corresponding amount is reclassified as an amortizable intangible asset and is amortized over the asset's estimated useful life.
	We evaluate the recoverability of our long-lived assets including intangible and tangible assets. Acquired finite-lived intangible assets are amortized over their useful lives. We evaluate long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. We recognize such impairment in the event the net book value of such assets exceeds their fair value. If the fair value of the long-lived assets exceeds the carrying value of the net assets assigned, then the assets are not impaired and no further testing is performed. If the carrying value of the net assets assigned exceeds the fair value of the assets, then we must perform the second step of the impairment test in order to determine the implied fair value. During fiscal 2014, we recognized a $2.1 million impairment charge of a long-lived asset for previously capitalized Storm software development costs as a result of our decision to make Storm available to customers at no cost.
	Property and Equipment
	Property and equipment are stated at cost net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets ranging from generally three to five years. Leasehold improvements are amortized over the shorter of the estimated useful life or the remaining lease term. When assets are retired or disposed of, the cost and accumulated depreciation are removed from the accounts, and any resulting gains or losses are included in the Consolidated Statements of Operations. Maintenance and repairs that do not improve or extend the lives of the respective assets are charged to expense in the period incurred.
	The following table presents the estimated useful lives of our property and equipment:
		Useful Life
	Computer equipment and software	3 years
	Furniture and fixtures	5 years
	Leasehold improvements	Shorter of the useful life of the asset or the lease term
	Capitalized Software Development Costs
Capitalization of software development costs for software to be sold, leased, or otherwise marketed begins upon the establishment of technological feasibility, which is generally the completion of a working prototype that has been certified as having no critical bugs and is a release candidate. Amortization begins once the software is ready for its intended use, generally based on the pattern in which the economic benefits will be consumed. We did not capitalize any internal software development costs for fiscal 2014 and 2013 because the cost incurred and the time between technological feasibility and product release was insignificant. For fiscal 2014, 2013 and 2012, total amortization expense was $0, $0.1 million and $0.3 million respectively, from capitalized purchased technology of $0.5 million in December 2010.
Costs related to software acquired, developed or modified solely to meet our internal requirements, with no substantive plans to market such software at the time of development, are capitalized. Costs incurred during the preliminary planning and evaluation stage of the project and during post implementation operational stage are expensed as incurred. Costs incurred during the application development stage of the project are capitalized. We define the design, configuration, and coding process as the application development stage. We did not capitalize any costs related to computer software developed for internal use in fiscal 2014. In fiscal 2013, we capitalized $2.8 million of costs related to computer software developed for internal use for our Storm software, which is included in Property and Equipment on the Consolidated Balance Sheets, respectively. During fiscal 2014, $0.4 million of these costs were amortized. During the third quarter of fiscal 2014, we recognized a $2.1 million impairment charge for the remaining balance of the previously capitalized Storm software development costs as a result of our decision to make Storm available to customers at no cost.
Commissions
Commissions are recorded as a component of sales and marketing expenses and consist of the variable compensation paid to our sales force. Sales commissions are earned and recorded at the time that a customer has entered into a binding purchase agreement. Commissions paid to sales personnel are recoverable only in the case that we cannot collect the invoiced amounts associated with a sales order. Commission expense was $54.0 million, $26.9 million and $22.3 million for fiscal 2014, 2013 and 2012 respectively.
Leases
We lease our facilities under operating leases. For leases that contain rent escalation or rent concession provisions, we record the total rent expense during the lease term on a straight-line basis over the term of the lease. We record the difference between the rent paid and the straight-line rent expense as a current and non-current deferred rent liability in Accrued expenses and other liabilities and Other liabilities, non-current, respectively, in the Consolidated Balance Sheets. Rent expense was $6.4 million, $3.9 million and $2.6 million during fiscal 2014, 2013 and 2012, respectively.
Advertising Expense
We expense advertising costs as incurred. We incurred $6.3 million, $6.0 million and $3.7 million in advertising expenses for fiscal 2014, 2013 and 2012, respectively. Advertising costs are recorded in Sales and marketing expenses in the Consolidated Statements of Operations.
Stock-Based Compensation
We recognize compensation expense for all share-based payment awards, including stock options and restricted stock, based on the estimated fair value of the award on the grant date in the Consolidated Statements of Operations over the related vesting periods. The expense recorded is based on awards ultimately expected to vest and therefore is reduced by estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We calculate the fair value of options using the Black-Scholes method and expense using the straight-line attribution approach.
We account for equity awards issued to non-employees, such as consultants, in accordance with the guidance relating to equity instruments that are issued to other than employees for acquiring, or in conjunction with selling, goods or services, using the Black-Scholes method to determine the fair value of such instruments. Awards granted to non-employees are remeasured over the vesting period, and the resulting value is recorded as an expense over the period the services are received.
The fair value of each option grant and stock purchase right granted under the Employee Stock Purchase Plan (“ESPP”) was estimated on the date of grant using the Black-Scholes option pricing model. We recognize stock-based compensation expense related to our ESPP on a straight-line basis over the offering period, which is twelve months. Stock-based compensation expense is recognized net of estimated forfeiture activity.
The determination of the grant date fair value of options using an option-pricing model is affected by assumptions regarding a number of other complex and subjective variables, which include our expected stock price volatility over the expected term of the options, stock option exercise and cancellation behaviors, risk-free interest rates and expected dividends.
Income Taxes
Income taxes are accounted for under the asset and liability method in accordance with authoritative guidance for income taxes. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
The adoption of the guidance on accounting for uncertainty in income taxes as set forth under ASC 740 Income Taxes requires us to identify, evaluate and measure all uncertain tax positions taken or to be taken on tax returns and to record liabilities for the amount of these positions that may not be sustained, or may only partially be sustained, upon examination by the relevant taxing authorities. Although we believe that our estimates and judgments were reasonable, actual results may differ from these estimates. Some or all of these judgments are subject to review by the taxing authorities.
Recently Issued Accounting Pronouncements
In July 2012, the Financial Accounting Standards Board (the “FASB”) issued updated authoritative guidance to allow entities to use a qualitative approach to test indefinite-lived intangible assets for impairment. This guidance permits an entity to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying value. If it is concluded that this is the case, it is necessary to perform the currently prescribed quantitative impairment test by comparing the fair value of the indefinite-lived intangible asset with its carrying value. Otherwise, the quantitative impairment test is not required. The adoption of this guidance did not have a material effect on our consolidated financial statements.
In February 2013, the FASB issued updated authoritative guidance requiring entities to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. We adopted this guidance during the three months ended April 30, 2013. The adoption of this guidance did not impact our consolidated financial statements, as the guidance is related to disclosure only and we have not had any significant reclassifications out of accumulated other comprehensive loss.
In July 2013, the FASB determined that an unrecognized tax benefit should be presented 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. This guidance is effective for our interim and annual periods beginning February 1, 2014. We do not expect the adoption of this guidance to have an impact on our consolidated financial statements.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Jan. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	The carrying amounts of certain of our financial instruments including cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term maturities.
	Assets and liabilities recorded at fair value in the financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels that are directly related to the amount of subjectivity associated with the inputs to the valuation of these assets or liabilities are as follows:
	Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities.
	Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability.
	The following table sets forth the fair value of our financial assets and liabilities that were measured on a recurring basis as of January 31, 2014 and 2013 (in thousands):
		31-Jan-14								31-Jan-13
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds	$	864,012	$	—	$	—	$	864,012	$	250,810	$	—	$	—	$	250,810
	Reported as:
	Assets:
	Cash and cash equivalents							$	864,012							$	250,810
	Total							$	864,012							$	250,810
	Our investments in money market funds are measured at fair value on a recurring basis. Our money market funds are targeted to be priced and have a net asset value of $1 per share. These money market funds are actively traded and reported daily through a variety of sources. The fair value of the money market fund investments are classified as Level 1.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Jan. 31, 2014
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	Property and Equipment
	Property and equipment are stated at cost, net of accumulated depreciation and amortization. These assets are depreciated and amortized using the straight-line method over their estimated useful lives. Property and equipment consisted of the following (in thousands):
		As of January 31,
		2014			2013
	Computer equipment and software	$	20,451		$	16,077
	Furniture and fixtures	5,364			2,714
	Leasehold improvements	7,128			4,129
		32,943			22,920
	Less: accumulated depreciation and amortization	(17,438		)	(9,715		)
	Property and equipment, net	$	15,505		$	13,205
	Depreciation and amortization expense was $7.7 million, $4.7 million and $2.1 million for the fiscal years ended January 31, 2014, 2013 and 2012 respectively. Included in depreciation and amortization expense during the fiscal year ended January 31, 2014 was a $2.1 million impairment charge of a long-lived asset for previously capitalized Storm software development costs as a result of our decision to make Storm available to customers at no cost.

Acquisitions_Goodwill_and_Othe

Acquisitions, Goodwill and Other Intangible Assets	12 Months Ended
	Jan. 31, 2014
Business Combinations [Abstract]	'
Acquisitions, Goodwill and Other Intangible Assets	'
	Acquisitions, Goodwill and Intangible Assets
	BugSense
	On September 25, 2013, we acquired BugSense, a privately-held Delaware corporation, which developed and offered as a service an analytics solution for machine data generated by mobile devices. This acquisition has been accounted for as a business combination. The purchase price of $9.0 million paid in cash was preliminarily allocated as follows: $4.7 million to identifiable intangible assets, $0.7 million to net deferred tax liability recorded and $0.7 million to net liabilities assumed, and the excess $5.7 million of the purchase price over the fair value of net assets acquired was recorded as goodwill allocated to our one operating segment. Goodwill is primarily attributable to our ability to further improve the overall performance of our mobile data gathering capabilities, expand our visibility into machine data generated by mobile devices and the value of acquired personnel. This goodwill is not deductible for U.S. income tax purposes. Pro forma results of operations of the acquired business have not been presented, as we do not consider the results to have a material effect on any of the periods presented in our Consolidated Statements of Operations. We are still finalizing the allocation of the purchase price to the individual tax liabilities assumed, which may be subject to change as additional information becomes available to us.
	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands):
		Fair value		Useful Life (months)
	Developed technology	$	2,940	36
	Customer relationships	1,460		36
	Other acquired intangible assets	330		24
	Total intangible assets subject to amortization	$	4,730
	Cloudmeter
	On December 6, 2013, we acquired Cloudmeter, a privately-held Delaware corporation, which developed technology that enables users to capture machine data directly from network traffic. This acquisition has been accounted for as a business combination. The purchase price of $21.0 million paid in cash was preliminarily allocated as follows: $8.5 million to identifiable intangible assets, $0.6 million to net deferred tax liability recorded and $0.2 million to net liabilities assumed, and the excess $13.3 million of the purchase price over the fair value of net assets acquired was recorded as goodwill allocated to our one operating segment. Goodwill is primarily attributable to enhancing the ability of our customers to analyze machine data directly from their networks and correlate it with other machine-generated data to gain insights across our core use cases in application and infrastructure management, IT operations, security and business analytics. This goodwill is not deductible for U.S. income tax purposes. Pro forma results of operations of the acquired business have not been presented as we do not consider the results to have a material effect on any of the periods presented in our Consolidated Statements of Operations. We are still finalizing the allocation of the purchase price to the individual tax liabilities assumed, which may be subject to change as additional information becomes available to us.
	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands):
		Fair value		Useful Life (months)
	Developed technology	$	7,330	48
	In-process research and development	500		Indefinite
	Customer relationships	160		36
	Other acquired intangible assets	480		24-36
	Total intangible assets subject to amortization	$	8,470
	Intangible Assets
	Intangible assets subject to amortization realized from acquisitions as of January 31, 2014 are as follows (in thousands):
		Gross Fair Value		Accumulated Amortization			Net Book Value		Weighted Average Remaining Useful Life
									(months)
	Developed technology	$	10,270	$	(648	)	$	9,622	42
	Customer relationships	1,620		(174		)	1,446		32
	Other acquired intangible assets	810		(84		)	726		28
	Total intangible assets subject to amortization	$	12,700	$	(906	)	$	11,794
	Additionally, we realized $0.5 million of in-process research and development upon the acquisition of Cloudmeter, which has an indefinite useful life. We will assess the carrying value and useful life of the asset once the associated research and development efforts are completed.
	The expected future amortization expense for acquired intangible assets as of January 31, 2014 is as follows (in thousands):
	Fiscal Period:
	Fiscal 2015	$	3,670
	Fiscal 2016	3,628
	Fiscal 2017	2,969
	Fiscal 2018	1,527
	Total amortization expense	$	11,794

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Jan. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Operating Lease Commitments
	We lease our office spaces under non-cancelable operating leases with rent expense recognized on a straight-line basis over the lease term. Rent expense was $6.4 million, $3.9 million and $2.6 million for the fiscal years ended January 31, 2014 and 2013 and 2012, respectively. Future minimum rental payments required under the operating lease agreements as of January 31, 2014 are as follows:
		Payments Due by Period*
		Total		Less Than 1		1-3 years		3-5 years		More Than 5
				year						years
		(in thousands)
	Operating lease obligations	$	47,936	$	7,999	$	16,338	$	17,114	$	6,485
	_________________________
	*We entered into a sublease agreement on November 16, 2012 for a portion of our office space in the United Kingdom, and the future sublease rental income of $1.2 million has been included as an offset to our future minimum rental payments.
	Legal Proceedings
	We are subject to certain routine legal proceedings, as well as demands and claims that arise in the normal course of our business. We make a provision for a liability relating to legal matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impact of negotiations, estimated settlements, legal rulings, advice of legal counsel and other information and events pertaining to a particular matter. In our opinion, resolution of any pending claims (either individually or in the aggregate) is not expected to have a material adverse impact on our consolidated results of operations, cash flows or financial position, nor is it possible to provide an estimated amount of any such loss. However, depending on the nature and timing of any such dispute, an unfavorable resolution of a matter could materially affect our future results of operations or cash flows, or both, in a particular quarter.
	Indemnification Arrangements
	During the ordinary course of business, we may indemnify, hold harmless and agree to reimburse for losses suffered or incurred, our customers, vendors and their affiliates for certain intellectual property infringement and other claims by third parties with respect to our products and services, in connection with our commercial end-user license arrangements or related to general business dealings with those parties.
	As permitted under Delaware law, we have entered into indemnification agreements with our officers and directors, indemnifying them for certain events or occurrences while they serve as officers or directors of the company.
	To date, there have not been any costs incurred in connection with such indemnification obligations; therefore, there is no accrual of such amounts at January 31, 2014.  We are unable to estimate the maximum potential impact of these indemnifications on our future results of operations.

Debt_Financing_Facilities

Debt Financing Facilities	12 Months Ended
	Jan. 31, 2014
Debt Disclosure [Abstract]	'
Debt Financing Facilities	'
	Debt Financing Facilities
	In May 2009, we entered into a Loan and Security Agreement with Silicon Valley Bank, which expired on April 30, 2013. The agreement included a revolving line of credit facility.
	On May 9, 2013 we entered into a Loan Agreement with Silicon Valley Bank. The agreement provides for a revolving line of credit facility, which expires May 9, 2015. Under the agreement, we are able to borrow up to $25 million. Interest on any drawdown under the revolving line of credit accrues either at the prime rate (3.25% in January 2014) or the LIBOR rate plus 2.75%. As of January 31, 2014, we had no balance outstanding under this agreement. The agreement contains customary financial covenants and other affirmative and negative covenants. We were in compliance with all covenants as of January 31, 2014.

Common_Stock

Common Stock	12 Months Ended
	Jan. 31, 2014
Stockholders' Equity Note [Abstract]	'
Common Stock	'
	Common Stock
	Our certificate of incorporation, as amended and restated, authorizes us to issue 1,000,000,000 shares of common stock, $0.001 par value per share. At January 31, 2014 and January 31, 2013, 116,099,516 shares and 100,920,350 shares of common stock were issued and outstanding, respectively.
	Early Exercise of Employee Options
	Stock options granted under our stock option plan provide certain employee option holders the right to exercise unvested options for shares of restricted common stock. Shares of restricted common stock, in the amounts of 56,250 and 93,750 at January 31, 2014 and January 31, 2013, respectively, were subject to a repurchase right held by us at the original issuance price in the event the optionees’ employment is terminated either voluntarily or involuntarily. For early exercises of employee options, this repurchase right generally lapses as to 1/4th of the shares subject to the option on the first anniversary of the vesting start date and as to 1/48th of the shares monthly thereafter.
	These repurchase terms are considered to be a forfeiture provision and do not result in variable accounting. The restricted shares issued upon early exercise of stock options are legally issued and outstanding. However, these restricted shares are only deemed outstanding for basic earnings per share computation purposes upon the respective repurchase rights lapsing. We treat cash received from employees for the exercise of unvested options as a refundable deposit shown as a liability in our consolidated balance sheets.

Convertible_Preferred_Stock

Convertible Preferred Stock	12 Months Ended
	Jan. 31, 2014
Temporary Equity Disclosure [Abstract]	'
Convertible Preferred Stock	'
	Convertible Preferred Stock
	Upon the closing of our IPO, all outstanding shares of convertible preferred stock were converted into shares of common stock. Warrants to purchase convertible preferred stock were converted into warrants to purchase common stock.
	Warrants to Purchase Convertible Preferred Stock
	Prior to the closing of our IPO, we remeasured the fair value of the preferred stock warrants at each balance sheet date. The fair value of the outstanding warrants was classified within non-current liabilities on the consolidated balance sheets, and any changes in fair value were recognized as a component of Other income (expense), net in our consolidated statements of operations. We performed the final remeasurement of the warrants at the closing date of our IPO and recorded an expense of $14.1 million arising from the revaluation during the three months ended April 30, 2012.

Stock_Compensation_Plans

Stock Compensation Plans	12 Months Ended
	Jan. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Compensation Plans	'
	Stock Compensation Plans
	Equity Incentive Plans
	In November 2003, our board adopted the 2003 Equity Incentive Plan (the “2003 Plan”). The 2003 Plan authorizes the granting of common stock options and restricted stock awards to employees, directors and consultants.
	In January 2012, our board approved the 2012 Equity Incentive Plan (the “2012 Plan”), which became effective upon the effectiveness of our IPO registration statement on Form S-1, on April 18, 2012. The 2012 Plan provides for the grant of incentive stock options, within the meaning of Section 422 of the Code, to our employees and any parent and subsidiary corporations’ employees, and for the grant of nonstatutory stock options, restricted stock, restricted stock units (“RSUs”), stock appreciation rights, performance units and performance shares to our employees, directors and consultants and any parent or subsidiary corporations’ employees and consultants. Upon the effectiveness of our IPO registration statement on Form S-1, all shares that were reserved but not issued under the 2003 Plan became available for issuance under the 2012 Plan and no further shares will be granted pursuant to the 2003 Plan. Canceled or forfeited equity awards under the 2003 Plan will also become available for issuance under the 2012 Plan. The term of an incentive stock option may not exceed 10 years, except that with respect to any participant who owns more than 10% of the voting power of all classes or our outstanding stock, the term must not exceed 5 years. Options and RSUs generally vest over 4 years.
	The 2012 plan provides for annual automatic increases on February 1 to the shares reserved for issuance. The automatic increase of the number of shares available for issuance under the 2012 Plan is equal to the least of 10 million shares, 5% of the outstanding shares of common stock as of the last day of our immediately preceding fiscal year or such other amount as our board may determine.
	The following table summarizes the stock option and RSU award activity during the fiscal year ended January 31, 2014:
					Options Outstanding										RSUs
															Outstanding
		Available			Shares			Weighted-				Weighted-	Aggregate		Shares
		for Grant						Average				Average	Intrinsic
								Exercise				Remaining	Value (1)
								Price				Contractual
								Per Share				Term
													(in thousands)
	Balances as of January 31, 2012	3,315,989			21,905,290			$	1.92
	Additional shares authorized	10,000,000
	Options granted	(3,644,484	)		3,644,484			13.69
	Options exercised	—			(5,529,112	)		1.25
	Options forfeited and expired	1,103,115			(1,103,115	)		4.02
	RSUs granted	(2,957,332	)												2,957,332
	RSUs vested	—													(2,125	)
	RSUs forfeited	50,500													(50,500	)
	Balances as of January 31, 2013	7,867,788			18,917,547			$	4.26			7.69	$	544,606	2,904,707
	Additional shares authorized	5,046,017
	Options granted	(5,000	)		5,000			70.48
	Options exercised	—			(7,254,049	)		3.27
	Options forfeited and expired	574,060			(574,060	)		6.08
	RSUs granted	(8,090,820	)												8,090,820
	RSUs vested	—													(748,880	)
	Shares withheld related to net share settlement of RSUs	273,769
	RSUs forfeited	252,959													(252,959	)
	Balances as of January 31, 2014	5,918,773			11,094,438			$	4.84			6.42	$	800,933	9,993,688
	Vested and expected to vest				10,837,307			$	4.78			6.39	$	783,033	9,494,004
	Exercisable as of January 31, 2014				5,895,562			$	2.61			5.24	$	438,764
	(1) The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of January 31, 2014.
	Under net settlement procedures applicable to our outstanding RSUs for current employees during the fiscal year ended 2014, upon each settlement date, RSUs are withheld to cover the required withholding tax, which is based on the value of the RSU on the settlement date as determined by the closing price of our common stock on the trading day of the applicable settlement date. The remaining shares are delivered to the recipient as shares of our common stock. The amount remitted to the tax authorities for the employees' tax obligation is reflected as a financing activity within our consolidated statements of cash flows. These shares withheld by us as a result of the net settlement of RSUs are not considered issued and outstanding, thereby reducing our shares outstanding used to calculate earnings per share. These shares are returned to the reserves and are available for future issuance under our 2012 Equity Incentive Plan.
	During the fiscal year ended 2014, $0.4 million in tax benefits have been realized from exercised stock options. At January 31, 2014, there was a total unrecognized compensation cost of $19.0 million related to these stock options, adjusted for estimated forfeitures, which is expected to be recognized over a weighted-average period of 1.71 years. At January 31, 2014, there was a total unrecognized compensation cost of $494.6 million related to RSUs, adjusted for estimated forfeitures, which is expected to be recognized over the next 3.51 years.
	The aggregate intrinsic value of options exercised during the fiscal year ended January 31, 2014 was $359.3 million. The weighted-average grant date fair value of options granted was $35.86 per share for the fiscal year ended January 31, 2014. The weighted-average grant date fair value of RSUs granted was $65.80 per share for the fiscal year ended January 31, 2014. The aggregate intrinsic value of RSUs vested during the fiscal year ended January 31, 2014 was $49.5 million.
	At January 31, 2013, there was a total unrecognized compensation cost of $31.2 million related to these stock options, adjusted for estimated forfeitures, which was expected to be recognized over the next 3.0 years. The total intrinsic value of options exercised during fiscal 2013 was $134.7 million. The weighted-average grant date fair value of options granted was $7.65 per share for fiscal 2013.
	Employee Stock Purchase Plan
	Our 2012 Employee Stock Purchase Plan (the “ESPP”) allows eligible employees to purchase shares of our common stock at a discount through payroll deductions of up to 15% of their eligible compensation, at not less than 85% of the fair market value, as defined in the ESPP, subject to any plan limitations. The ESPP provides for consecutive 12-month offering periods, starting on the first trading day on or after June 15 and December 15 of each year. The ESPP provides for an automatic increase of the number of shares available for issuance under the ESPP equal to the least of 4 million shares, 2% of the outstanding shares of our common stock on the last day of the immediately preceding fiscal year, or such other amount as may be determined by our board of directors.
	Stock-Based Compensation Expense
	Stock-based compensation expense related to our stock-based awards, employee stock purchases and restricted stock units was allocated as follows:
		Fiscal Year Ended January 31,
	(in thousands)	2014				2013				2012
	Cost of revenues	$	5,283			$	1,217			$	134
	Research and development	20,829				6,170				841
	Sales and marketing	30,012				8,093				1,488
	General and administrative	13,244				4,000				1,297
	Total stock-based compensation expense	$	69,368			$	19,480			$	3,760
	Valuation Assumptions
	We estimated the fair values of each option awarded on the date of grant using the Black-Scholes option pricing model utilizing the assumptions noted below. The expected term of the options is based on the average period the stock options are expected to remain outstanding calculated as the midpoint of the options’ vesting terms and contractual expiration periods, as we do not have sufficient historical information to develop reasonable expectations about future exercise patterns and post-vesting employment termination behavior. The expected stock price volatility for our stock was determined by examining the historical volatilities of a group of our industry peers as we do not have sufficient trading history of our common stock. The risk-free interest rate was calculated using the average of the published interest rates United States Treasury zero-coupon issues with maturities that approximate the expected term. The dividend yield assumption is zero as we do not have any history of, nor plans to make, dividend payments.
	The following assumptions were used to estimate the fair value of options granted to employees:
		Fiscal Year Ended January 31,
		2014			2013		2012
	Expected volatility	53.3	%		50.0 - 53.2%		48.4 - 56.5%
	Risk-free rate	1.75	%		0.82 - 1.41%		0.92 - 2.47%
	Dividend yield	—			—		—
	Expected term (in years)	5.97			5.90 - 6.13		5.25 - 6.08
	Forfeitures were estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differed from those estimates. Forfeitures were estimated based on historical experience.
	The following assumptions were used to estimate the fair value of nonemployee options:
		Fiscal Year Ended January 31,
		2014		2013		2012
Expected volatility	49.8 - 58.0%		49.7 - 51.7%		52.6 - 58.0%
Risk-free rate	1.37 - 2.52%		1.38 - 1.87%		1.70 - 1.80%
Dividend yield	—		—		—
Expected term (in years)	7.45 - 9.12		8.05 - 9.35		9.06 - 9.88
The following assumptions were used to estimate the fair value of the ESPP:
	Fiscal Year Ended January 31,
	2014			2013			2012
Expected volatility	33.9 - 44.4%			42.0 - 49.1%			—
Risk-free rate	0.08 - 0.13%			0.10 - 0.19%			—
Dividend yield	—			—			—
Expected term (in years)	0.05 - 1.00			0.50 - 1.16			—

Geographic_Information

Geographic Information	12 Months Ended
	Jan. 31, 2014
Segment Reporting [Abstract]	'
Geographic Information	'
	Geographic Information
	Revenue
	Revenues by geography are based on the shipping address of the customer. The following tables present our revenues by geographic region for the periods presented (in thousands):
		Fiscal Year Ended January 31,
		2014		2013		2012
	United States	$	234,458	$	155,926	$	91,935
	International	68,165		43,018		29,025
	Total revenues	$	302,623	$	198,944	$	120,960
	Other than the United States, no other individual country exceeded 10% of total revenues during any of the periods presented. No individual customer represented greater than 10% of total revenues during any of the periods presented. At January 31, 2014, no customer represented 10% of total accounts receivable. At January 31, 2013, there was one customer that represented approximately 31% of total accounts receivable.
	Property and Equipment
	The following tables present our property and equipment by geographic region for the periods presented (in thousands):
		As of January 31,
		2014		2013
	United States	$	14,005	$	11,471
	International	1,500		1,734
	Total property and equipment, net	$	15,505	$	13,205
	Other than the United States, no other individual country exceeded 10% of total property and equipment as of January 31, 2014. As of January 31, 2013, one country, the United Kingdom, represented approximately 13% of total property and equipment.

Income_Taxes

Income Taxes	12 Months Ended
	Jan. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Loss before income tax expense consists of the following for the periods shown below (in thousands):
		Fiscal Year Ended January 31,
		2014			2013			2012
	United States	$	(80,900	)	$	(37,613	)	$	(11,318	)
	International	1,898			1,645			504
	Total	$	(79,002	)	$	(35,968	)	$	(10,814	)
	Income tax expense consists of the following for the periods shown below (in thousands):
		Fiscal Year Ended January 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	—		$	—		$	—
	State	178			50			5
	Foreign	1,202			944			173
	Total current tax provision	1,380			994			178
	Deferred tax provision:
	Federal	(1,043		)	—			—
	State	(131		)	—			—
	Foreign	(200		)	(281		)	—
	Total deferred tax provision	(1,374		)	(281		)	—
	Total tax provision	$	6		$	713		$	178
	For the fiscal years ended January 31, 2014, our tax provision consisted principally of state taxes in the United States and foreign taxes from legal entities established in foreign jurisdictions and software withholding taxes paid, offset by a partial release of valuation allowance on our United States deferred tax assets, as a result of the acquisitions made in the current fiscal year. For the fiscal years ended January 2013 and 2012, our tax provision consisted principally of state and foreign income tax expense.
	The reconciliation of federal statutory income tax rate to our effective income tax rate is as follows (in thousands):
		Fiscal Year Ended January 31,
		2014			2013			2012
	Expected provision at United States federal statutory rate	$	(26,861	)	$	(12,229	)	$	(3,677	)
	State income taxes - net of federal benefit	(2,124		)	(375		)	(631		)
	Stock options	3,300			4,452			1,064
	Preferred stock warrant	—			—			810
	Research and development tax credits	(6,309		)	(2,725		)	(440		)
	Tax reserve for uncertain tax positions	8			25			99
	Change in valuation allowance	32,069			11,205			2,707
	Non-deductible expenses	866			333			246
	Release of valuation allowance due to acquisitions	(1,173		)	—			—
	Other	230			27			—
	Total tax provision	$	6		$	713		$	178
	Deferred tax assets and liabilities consist of the following (in thousands):
		Fiscal Year Ended January 31,
		2014			2013
	Deferred tax assets:
	Net operating loss carryforwards	$	18,979		$	9,544
	Accrued liabilities	4,326			3,013
	Tax credit carryforwards	13,314			5,695
	Stock-based compensation	12,667			2,669
	Deferred revenue	13,003			5,270
	Valuation allowance	(57,464		)	(24,460		)
	Total deferred tax assets	4,825			1,731
	Deferred tax liabilities:
	Depreciation and amortization	(4,529		)	(1,450		)
	Total deferred tax liabilities	(4,529		)	(1,450		)
	Net deferred taxes	296			281
	Recorded as:
	Current deferred tax assets	8,614			2,886
	Current valuation allowance	(7,920		)	(2,572		)
	Non-current deferred tax assets	49,147			21,854
	Non-current valuation allowance	(49,545		)	(21,887		)
	Net deferred tax assets	$	296		$	281
	On the consolidated balance sheets, these deferred tax assets are included in Prepaid expenses and other current assets and Other assets.
	Net operating loss and tax credit carry forwards as of January 31, 2014 are as follows (in thousands):
		Amount			Expiration years
	Net operating loss, federal	$	471,420		2025-2034
	Net operating loss, state	107,276			2016-2034
	Tax credit, federal	11,207			2026-2034
Tax credit, state	10,220			N/A
ASC Topic 740, Income Taxes, requires that the tax benefit of net operating losses, temporary differences and credit carryforwards be recorded as an asset to the extent that we assess that realization is more likely than not. Realization of the future tax benefits is dependent on our ability to generate sufficient taxable income within the carryforward period. Due to our history of U.S. operating losses, we believe the recognition of the deferred tax assets arising from the above mentioned future tax benefits is currently not more likely than not to be realized and, accordingly, have provided a full valuation allowance against net U.S. deferred tax assets. The valuation allowance totaled $57.5 million, $24.5 million and $19.4 million for fiscal 2014, 2013, and 2012, respectively.
The gross increase in the valuation allowance was $34.2 million between fiscal 2014 and 2013 with an offsetting decrease of $1.2 million from the release of the valuation allowance due to acquisitions. At January 31, 2014, we had federal and state net operating loss carryforwards of $471.4 million and $107.3 million, respectively. The net operating losses for federal and state purposes begin to expire starting in 2025 and 2016, respectively. Additionally, we had federal and state research and development tax credit carryforwards of $20.0 million and $4.9 million as of January 31, 2014 and 2013, respectively. Our federal tax credits will start to expire in 2026 if not utilized. At January 31, 2014, we also had $1.4 million of California Enterprise Zone credits. The California Enterprise Zone credits will expire in 2023 if not utilized.
If certain factors change, we may determine that there is sufficient positive evidence to support a reversal of, or decrease in, the valuation allowance. If we were to reverse all or some part of our valuation allowance, our consolidated financial statements in the period of reversal would likely reflect an increase in assets on our balance sheet and a corresponding tax benefit to our consolidated statements of operations in the amount of the reversal.
Because of certain prior period ownership changes, the utilization of a portion of our United States federal and state NOL and tax credit carryforwards may be limited. At January 31, 2014, we determined that a portion of the NOL will expire unused. Accordingly, a portion of our deferred tax asset and valuation allowance have been adjusted.
The excess tax benefits associated with stock option exercises are recorded to stockholders’ equity only when they reduce income taxes payable.  As a result, the excess tax benefits are included in the net operating carryforwards, however, are not reflected in deferred tax assets for fiscal 2014 and 2013. The excess tax benefits for fiscal year 2014 and 2013 are $144.3 million and $37.6 million, respectively.
As of January 31, 2014, our liability for uncertain tax positions was $4.9 million, of which $0.2 million would, if recognized, impact our effective tax rate. The remainder will not, if recognized, affect the effective income tax rate due to the valuation allowance that currently offsets deferred tax assets.
	Fiscal Year Ended January 31,
(in thousands)	2014			2013			2012
Balance at beginning of year	$	2,105		$	1,056		$	817
Increase related to prior year tax positions	—			—			—
Decrease related to prior year tax positions	—			(13		)	—
Increase related to current year tax positions	2,757			1,062			239
Settlements with tax authorities	—			—			—
Decrease related to lapse of statue of limitations	—			—			—
Balance at end of year	$	4,862		$	2,105		$	1,056
The adoption of this guidance required us to identify, evaluate and measure all uncertain tax positions taken or to be taken on tax returns and to record liabilities for the amount of these positions that may not be sustained, or may only partially be sustained, upon examination by the relevant taxing authorities. Although we believe that our estimates and judgments were reasonable, actual results may differ from these estimates. Some or all of these judgments are subject to review by the taxing authorities.
We are subject to income taxes in United States federal and various state and local jurisdictions. Generally, we are no longer subject to United States federal, state and local tax examinations for tax years ended before December 31, 2009. However, to the extent allowed by law, the tax authorities may have the right to examine prior periods where net operating losses or tax credits were generated and carried forward, and make adjustments up to the amount of the net operating loss or credit carryforward.
We accrue interest and penalties related to unrecognized tax benefits as a component of income tax expense. As of January 31, 2014 and 2013, there was accrued interest and penalties of $99,000 and $90,000, respectively.
We intend either to invest our non-U.S. earnings permanently in foreign operations or to remit these earnings to our United States entities in a tax-free manner. For this reason, we do not record federal income taxes on the undistributed earnings of $5.0 million of our foreign subsidiaries. The determination of the amount of deferred taxes on these earnings is not practicable since the computation would depend on a number of factors that cannot be known unless a decision is made to repatriate the earnings.

Net_Loss_Per_Share

Net Loss Per Share	12 Months Ended
	Jan. 31, 2014
Earnings Per Share [Abstract]	'
Net Loss Per Share	'
	Net Loss Per Share
	Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase or forfeiture. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including preferred stock, stock options, RSUs and warrants, to the extent dilutive.
	The following table sets forth the computation of historical basic and diluted net loss per share (in thousands, except per share data):
		Fiscal Year Ended January 31,
		2014				2013			2012
	Numerator:
	Net loss	$	(79,008	)		$	(36,681	)	$	(10,992	)
	Denominator:
	Weighted-average common shares outstanding	105,143				80,465			20,921
	Less: Weighted-average unvested common shares subject to repurchase or forfeiture	(76		)		(219		)	(275		)
	Weighted-average shares used to compute net loss per share, basic and diluted	105,067				80,246			20,646
	Net loss per share, basic and diluted	$	(0.75	)		$	(0.46	)	$	(0.53	)
	Since we were in a net loss position for all periods presented, basic net loss per share is the same as diluted net loss per share for all periods as the inclusion of all potentially dilutive securities outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
		As of January 31,
		2014			2013			2012
	Shares subject to outstanding common stock options	11,094,438			18,917,547			21,905,290
	Shares subject to outstanding RSUs	9,993,688			2,904,707			—
	Series A convertible preferred stock	—			—			20,600,000
	Series B convertible preferred stock	—			—			20,304,560
	Series C convertible preferred stock	—			—			16,025,634
	Employee stock purchase plan	56,369			368,848			—
	Shares subject to preferred stock warrants	—			—			469,557
	Total	21,144,495			22,191,102			79,305,041

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Jan. 31, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	Certain members of our board of directors ("Board") serve on the board of directors of and/or are executive officers of, and, in some cases, are investors in, companies that are customers or vendors of ours. Certain of our executive officers also serve on the board of directors of companies that are customers or vendors of ours.  We believe the transactions between these companies and us were carried out on terms that are consistent with similar transactions with our other similarly situated customers or vendors. We recognized revenue from sales to these companies of $3.1 million, $2.0 million, and $1.6 million for the fiscal years ended January 31, 2014, 2013 and 2012, respectively. There were no accounts receivable due from these companies as of January 31, 2014 and January 31, 2013, respectively. We also recorded $1.4 million, $0.9 million, and $0.3 million in expenses related to purchases from these companies during the fiscal years ended January 31, 2014, 2013 and 2012, respectively. There were no accounts payable to these companies as of January 31, 2014 or January 31, 2013.

Description_of_the_Business_an1

Description of the Business and Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 31, 2014
Accounting Policies [Abstract]	'
Fiscal Year	'
	Fiscal Year
	Our fiscal year ends on January 31. References to fiscal 2014, for example, refer to the fiscal year ended January 31, 2014.
Use of Estimates	'
	Use of Estimates
	The preparation of 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 financial statements and reported amounts of revenues and expenses during the reporting periods covered by the financial statements and accompanying notes. In particular, we make estimates with respect to the fair value of multiple elements in revenue recognition, uncollectible accounts receivable, the assessment of the useful life and recoverability of long-lived assets (property and equipment, goodwill and identified intangibles), stock-based compensation expense, the fair value of assets acquired and liabilities assumed for business combinations, income taxes and contingencies. Actual results could differ from those estimates.
Segments	'
	Segments
	We operate our business as one operating segment: the development and marketing of software products that enable our customers to gain real-time operational intelligence by harnessing the value of their data. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources.
Principles of Consolidation	'
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of Splunk Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated upon consolidation.
Foreign Currency	'
	Foreign Currency
	The functional currency of our foreign subsidiaries is the respective local currency. Translation adjustments arising from the use of differing exchange rates from period to period are included in Accumulated Other Comprehensive Loss within Stockholders' Equity. Foreign currency transaction gains and losses are included in Other Income (Expense), Net and were not material for the three years ended January 31, 2014. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenues and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates.
Revenue Recognition	'
	Revenue Recognition
	We generate revenues primarily in the form of software license fees and related maintenance and services fees. License fees include perpetual license fees, term license fees and royalties. Maintenance and services primarily consist of fees for maintenance services (including support and unspecified upgrades and enhancements when and if they are available), training and professional services that are not essential to functionality.
	We recognize revenues when all of the following conditions are met:
	•	there is persuasive evidence of an arrangement;
	•	the software or services have been delivered to the customer;
	•	the amount of fees to be paid by the customer is fixed or determinable; and
	•	the collection of the related fees is probable.
	Signed agreements are used as evidence of an arrangement. If a contract signed by the customer does not exist, we use a purchase order as evidence of an arrangement. In cases where both a signed contract and a purchase order exist, we consider the signed contract to be the final persuasive evidence of an arrangement. Electronic delivery occurs when we provide the customer with access to the software via a license key. We assess whether a fee is fixed or determinable at the outset of the arrangement, primarily based on the payment terms associated with the transaction. We do not generally offer extended payment terms with typical terms of payment due between 30 and 60 days from delivery of software. We assess collectability of the fee based on a number of factors such as collection history and creditworthiness of the customer. If we determine that collectability is not probable, revenue is deferred until collectability becomes probable, generally upon receipt of cash.
	When contracts contain multiple elements wherein vendor specific objective evidence ("VSOE") exists for all undelivered elements and the services, if any, are not essential to the functionality of the delivered elements, we account for the delivered elements in accordance with the "Residual Method." Perpetual license arrangements are typically accompanied by maintenance agreements. Maintenance revenues consist of fees for providing software updates on a when and if available basis and technical support for software products ("post-contract support" or "PCS") for an initial term. Maintenance revenues are recognized ratably over the term of the agreement. We have established fair value for maintenance on perpetual licenses due to consistently priced standalone sales of maintenance. Revenues related to term license fees are recognized ratably over the contract term beginning on the date the customer has access to the software license key and continuing through the end of the contract term. In these cases we do not have VSOE of fair value for maintenance as fees for support and maintenance are bundled with the license over the entire term of the contract.
	License arrangements may also include professional services and training services, which are typically delivered early in the contract term. In determining whether professional services revenues should be accounted for separately from license revenues, we evaluate whether the professional services are considered essential to the functionality of the software using factors such as the nature of our software products; whether they are ready for use by the customer upon receipt; the nature of our implementation services, which typically do not involve significant customization to or development of the underlying software code; the availability of services from other vendors; whether the timing of payments for license revenues is coincident with performance of services; and whether milestones or acceptance criteria exist that affect the realizability of the software license fee. Substantially all of our professional services arrangements are billed on a time and materials basis and, accordingly, are recognized as the services are performed. Training revenues are recognized as training services are delivered. VSOE of fair value of professional and training services is based upon stand-alone sales of those services. Payments received in advance of services performed are deferred and recognized when the related services are performed.
	We are unable to establish VSOE of fair value for all undelivered elements in certain arrangements that include term licenses, maintenance and services, due to the lack of VSOE for maintenance bundled with the term license. In these instances, all revenue is recognized ratably over the period that the services are expected to be performed, commencing when all service periods have started. In arrangements where the expected service periods of maintenance services and professional or training services differ, we recognize all revenue over the longer of the expected service periods, which is generally the maintenance period.
	We do not offer credits or refunds and therefore have not recorded any sales return allowance for any of the periods presented. Upon a periodic review of outstanding accounts receivable, amounts that are deemed to be uncollectible are written off against the allowance for doubtful accounts. Our policy is to record revenues net of any applicable sales, use or excise taxes.
	We recognize revenues from the indirect sales channel upon sell-through by the partner or distributor. Sell-through is determined when we receive an order form from a reseller for a specific end-user sale. We do not offer right of return, product rotation or price protection to any of our channel partners. We also have licensing arrangements with OEM customers for which royalty fees are generally recognized as revenue upon receipt of reports of units shipped, respectively. Provided all other revenue criteria are met, the upfront, minimum, non-refundable license fees from OEM customers are recognized upon delivery, and on-going royalty fees are recognized upon reports of units shipped.
	In our consolidated statements of operations, revenues are categorized as license or maintenance and services revenues. We allocate revenues from arrangements containing multiple elements to each of these categories based on the VSOE of fair value for elements in each revenue arrangement and the application of the residual method for arrangements in which we have established VSOE of fair value for all undelivered elements. In arrangements where we are not able to establish VSOE of fair value for all undelivered elements, we first allocate revenues to any undelivered elements for which VSOE of fair value has been established, then allocate revenues to any undelivered elements for which VSOE of fair value has not been established based upon management's best estimate of fair value of those undelivered elements and apply a residual method to determine the license fee. Management's best estimate of fair value of undelivered elements for which VSOE of fair value has not been established is based upon the VSOE of similar offerings and other objective criteria.
	Deferred revenue consists substantially of amounts invoiced in advance of revenue recognition for our products and services described above. We recognize deferred revenue as revenue only when the revenue recognition criteria are met.
Cash and Cash Equivalents and Restricted Cash	'
	Cash and Cash Equivalents and Restricted Cash
	We consider all highly liquid instruments with original or remaining maturities of 90 days or less at the date of purchase to be cash equivalents. Cash and cash equivalents are recorded at cost, which approximates fair value. We do not hold or issue financial instruments for trading purposes.
Concentration of Risk	'
	Concentration of Risk
	Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. We maintain the majority of our cash balance at one financial institution that management believes is a high-credit, quality financial institution and invest our cash equivalents in highly rated money market funds.
	At January 31, 2014, no customer represented greater than 10% of total accounts receivable. At January 31, 2013, there was one customer that represented approximately 31% of total accounts receivable.
	Our accounts receivable is subject to collection risks. Our gross accounts receivable is reduced for this risk by an allowance for doubtful accounts. This allowance is for estimated losses resulting from the inability of our customers to make required payments. It is an estimate and is regularly evaluated for adequacy by taking into consideration a combination of factors. We look at factors such as past collection experience, credit quality of the customer, age of the receivable balance, and current economic conditions. These factors are reviewed to determine whether an allowance for bad debts should be recorded to reduce the receivable balance to the amount believed to be collectible.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The carrying amounts of certain of our financial instruments including cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term maturities.
	Assets and liabilities recorded at fair value in the financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, which are directly related to the amount of subjectivity, associated with the inputs to the valuation of these assets or liabilities are as follows:
	Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities.
	Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and considers factors specific to the asset or liability. Our convertible preferred stock warrant liability was classified within Level 3 of the fair value hierarchy.
Goodwill and Intangible Assets	'
	Goodwill and indefinite-lived intangible assets are carried at cost and are evaluated annually for impairment, or more frequently if circumstances exist that indicate that impairment may exist. When conducting our annual goodwill impairment assessment, we perform a quantitative evaluation of whether goodwill is impaired using the two-step impairment test. The first step is comparing the fair value of our reporting unit to its carrying value. We consider the enterprise to be the reporting unit for this analysis. If step one indicates that impairment potentially exists, the second step is performed to measure the amount of impairment, if any. We record the amount by which the carrying value of the goodwill exceeds its implied fair value, if any, as impairment.
	Finite-lived intangible assets are amortized over their useful lives. Each period we evaluate the estimated remaining useful life our finite-lived intangible assets and whether events or changes in circumstances warrant a revision to the remaining period of amortization. The carrying amounts of these assets are periodically reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparison of the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate. If the undiscounted cash flows used in the test for recoverability are less than the carrying amount of these assets then the carrying amount of such assets is reduced to fair value.
	In-process research and development is initially capitalized at fair value as an intangible asset with an indefinite life and assessed for impairment thereafter. When in-process research and development projects are completed, the corresponding amount is reclassified as an amortizable intangible asset and is amortized over the asset's estimated useful life.
Long-Lived Assets and Impairment Assessments	'
	We evaluate the recoverability of our long-lived assets including intangible and tangible assets. Acquired finite-lived intangible assets are amortized over their useful lives. We evaluate long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. We recognize such impairment in the event the net book value of such assets exceeds their fair value. If the fair value of the long-lived assets exceeds the carrying value of the net assets assigned, then the assets are not impaired and no further testing is performed. If the carrying value of the net assets assigned exceeds the fair value of the assets, then we must perform the second step of the impairment test in order to determine the implied fair value.
Property and Equipment	'
	Property and Equipment
	Property and equipment are stated at cost net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets ranging from generally three to five years. Leasehold improvements are amortized over the shorter of the estimated useful life or the remaining lease term. When assets are retired or disposed of, the cost and accumulated depreciation are removed from the accounts, and any resulting gains or losses are included in the Consolidated Statements of Operations. Maintenance and repairs that do not improve or extend the lives of the respective assets are charged to expense in the period incurred.
	The following table presents the estimated useful lives of our property and equipment:
		Useful Life
	Computer equipment and software	3 years
	Furniture and fixtures	5 years
	Leasehold improvements	Shorter of the useful life of the asset or the lease term
Capitalized Software Development Costs	'
	Capitalized Software Development Costs
	Capitalization of software development costs for software to be sold, leased, or otherwise marketed begins upon the establishment of technological feasibility, which is generally the completion of a working prototype that has been certified as having no critical bugs and is a release candidate. Amortization begins once the software is ready for its intended use, generally based on the pattern in which the economic benefits will be consumed. We did not capitalize any internal software development costs for fiscal 2014 and 2013 because the cost incurred and the time between technological feasibility and product release was insignificant. For fiscal 2014, 2013 and 2012, total amortization expense was $0, $0.1 million and $0.3 million respectively, from capitalized purchased technology of $0.5 million in December 2010.
	Costs related to software acquired, developed or modified solely to meet our internal requirements, with no substantive plans to market such software at the time of development, are capitalized. Costs incurred during the preliminary planning and evaluation stage of the project and during post implementation operational stage are expensed as incurred. Costs incurred during the application development stage of the project are capitalized. We define the design, configuration, and coding process as the application development stage. We did not capitalize any costs related to computer software developed for internal use in fiscal 2014. In fiscal 2013, we capitalized $2.8 million of costs related to computer software developed for internal use for our Storm software, which is included in Property and Equipment on the Consolidated Balance Sheets, respectively. During fiscal 2014, $0.4 million of these costs were amortized. During the third quarter of fiscal 2014, we recognized a $2.1 million impairment charge for the remaining balance of the previously capitalized Storm software development costs as a result of our decision to make Storm available to customers at no cost.
Commissions	'
	Commissions
	Commissions are recorded as a component of sales and marketing expenses and consist of the variable compensation paid to our sales force. Sales commissions are earned and recorded at the time that a customer has entered into a binding purchase agreement.
Leases	'
	Leases
	We lease our facilities under operating leases. For leases that contain rent escalation or rent concession provisions, we record the total rent expense during the lease term on a straight-line basis over the term of the lease. We record the difference between the rent paid and the straight-line rent expense as a current and non-current deferred rent liability in Accrued expenses and other liabilities and Other liabilities, non-current, respectively, in the Consolidated Balance Sheets.
Advertising Expense	'
	Advertising Expense
	We expense advertising costs as incurred. We incurred $6.3 million, $6.0 million and $3.7 million in advertising expenses for fiscal 2014, 2013 and 2012, respectively. Advertising costs are recorded in Sales and marketing expenses in the Consolidated Statements of Operations.
Stock-Based Compensation	'
	Stock-Based Compensation
	We recognize compensation expense for all share-based payment awards, including stock options and restricted stock, based on the estimated fair value of the award on the grant date in the Consolidated Statements of Operations over the related vesting periods. The expense recorded is based on awards ultimately expected to vest and therefore is reduced by estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We calculate the fair value of options using the Black-Scholes method and expense using the straight-line attribution approach.
	We account for equity awards issued to non-employees, such as consultants, in accordance with the guidance relating to equity instruments that are issued to other than employees for acquiring, or in conjunction with selling, goods or services, using the Black-Scholes method to determine the fair value of such instruments. Awards granted to non-employees are remeasured over the vesting period, and the resulting value is recorded as an expense over the period the services are received.
	The fair value of each option grant and stock purchase right granted under the Employee Stock Purchase Plan (“ESPP”) was estimated on the date of grant using the Black-Scholes option pricing model. We recognize stock-based compensation expense related to our ESPP on a straight-line basis over the offering period, which is twelve months. Stock-based compensation expense is recognized net of estimated forfeiture activity.
	The determination of the grant date fair value of options using an option-pricing model is affected by assumptions regarding a number of other complex and subjective variables, which include our expected stock price volatility over the expected term of the options, stock option exercise and cancellation behaviors, risk-free interest rates and expected dividends.
Income Taxes	'
	Income Taxes
	Income taxes are accounted for under the asset and liability method in accordance with authoritative guidance for income taxes. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
	The adoption of the guidance on accounting for uncertainty in income taxes as set forth under ASC 740 Income Taxes requires us to identify, evaluate and measure all uncertain tax positions taken or to be taken on tax returns and to record liabilities for the amount of these positions that may not be sustained, or may only partially be sustained, upon examination by the relevant taxing authorities. Although we believe that our estimates and judgments were reasonable, actual results may differ from these estimates. Some or all of these judgments are subject to review by the taxing authorities.
Recently Issued Accounting Pronouncements	'
	Recently Issued Accounting Pronouncements
	In July 2012, the Financial Accounting Standards Board (the “FASB”) issued updated authoritative guidance to allow entities to use a qualitative approach to test indefinite-lived intangible assets for impairment. This guidance permits an entity to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying value. If it is concluded that this is the case, it is necessary to perform the currently prescribed quantitative impairment test by comparing the fair value of the indefinite-lived intangible asset with its carrying value. Otherwise, the quantitative impairment test is not required. The adoption of this guidance did not have a material effect on our consolidated financial statements.
	In February 2013, the FASB issued updated authoritative guidance requiring entities to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. We adopted this guidance during the three months ended April 30, 2013. The adoption of this guidance did not impact our consolidated financial statements, as the guidance is related to disclosure only and we have not had any significant reclassifications out of accumulated other comprehensive loss.
	In July 2013, the FASB determined that an unrecognized tax benefit should be presented 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. This guidance is effective for our interim and annual periods beginning February 1, 2014. We do not expect the adoption of this guidance to have an impact on our consolidated financial statements.

Description_of_the_Business_an2

Description of the Business and Significant Accounting Policies (Tables)	12 Months Ended
	Jan. 31, 2014
Accounting Policies [Abstract]	'
Schedule of changes in the allowance for doubtful accounts	'
	The following table presents the changes in the allowance for doubtful accounts (in thousands):
		Fiscal Year Ended January 31,
	(in thousands)	2014			2013			2012
	Balance at beginning of period	$	821		$	557		$	400
	Add: bad debt expense	140			286			247
	Less: write-offs, net of recoveries	(203		)	(22		)	(90		)
	Balance at end of period	$	758		$	821		$	557
Schedule of estimated useful lives of property and equipment	'
	The following table presents the estimated useful lives of our property and equipment:
		Useful Life
	Computer equipment and software	3 years
	Furniture and fixtures	5 years
	Leasehold improvements	Shorter of the useful life of the asset or the lease term

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Jan. 31, 2014
Fair Value Disclosures [Abstract]	'
Schedule of fair value of financial assets and liabilities that were measured on a recurring basis	'
	The following table sets forth the fair value of our financial assets and liabilities that were measured on a recurring basis as of January 31, 2014 and 2013 (in thousands):
		31-Jan-14								31-Jan-13
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds	$	864,012	$	—	$	—	$	864,012	$	250,810	$	—	$	—	$	250,810
	Reported as:
	Assets:
	Cash and cash equivalents							$	864,012							$	250,810
	Total							$	864,012							$	250,810

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Jan. 31, 2014
Property, Plant and Equipment [Abstract]	'
Schedule of components of property and equipment	'
	Property and equipment consisted of the following (in thousands):
		As of January 31,
		2014			2013
	Computer equipment and software	$	20,451		$	16,077
	Furniture and fixtures	5,364			2,714
	Leasehold improvements	7,128			4,129
		32,943			22,920
	Less: accumulated depreciation and amortization	(17,438		)	(9,715		)
	Property and equipment, net	$	15,505		$	13,205

Acquisitions_Goodwill_and_Othe1

Acquisitions, Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Jan. 31, 2014
Business Acquisition [Line Items]	'
Schedule of finite-lived intangible assets	'
	Intangible assets subject to amortization realized from acquisitions as of January 31, 2014 are as follows (in thousands):
		Gross Fair Value		Accumulated Amortization			Net Book Value		Weighted Average Remaining Useful Life
									(months)
	Developed technology	$	10,270	$	(648	)	$	9,622	42
	Customer relationships	1,620		(174		)	1,446		32
	Other acquired intangible assets	810		(84		)	726		28
	Total intangible assets subject to amortization	$	12,700	$	(906	)	$	11,794
Schedule of expected future amortization for capitalized computer software costs developed for internal use	'
	The expected future amortization expense for acquired intangible assets as of January 31, 2014 is as follows (in thousands):
	Fiscal Period:
	Fiscal 2015	$	3,670
	Fiscal 2016	3,628
	Fiscal 2017	2,969
	Fiscal 2018	1,527
	Total amortization expense	$	11,794
BugSense	'
Business Acquisition [Line Items]	'
Schedule of finite-lived intangible assets acquired as part of business combination	'
	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands):
		Fair value		Useful Life (months)
	Developed technology	$	2,940	36
	Customer relationships	1,460		36
	Other acquired intangible assets	330		24
	Total intangible assets subject to amortization	$	4,730
Cloudmeter	'
Business Acquisition [Line Items]	'
Schedule of finite-lived intangible assets acquired as part of business combination	'
	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands):
		Fair value		Useful Life (months)
	Developed technology	$	7,330	48
	In-process research and development	500		Indefinite
	Customer relationships	160		36
	Other acquired intangible assets	480		24-36
	Total intangible assets subject to amortization	$	8,470

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Jan. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of future minimum rental payments required under the operating lease agreements	'
	Future minimum rental payments required under the operating lease agreements as of January 31, 2014 are as follows:
		Payments Due by Period*
		Total		Less Than 1		1-3 years		3-5 years		More Than 5
				year						years
		(in thousands)
	Operating lease obligations	$	47,936	$	7,999	$	16,338	$	17,114	$	6,485
	_________________________
	*We entered into a sublease agreement on November 16, 2012 for a portion of our office space in the United Kingdom, and the future sublease rental income of $1.2 million has been included as an offset to our future minimum rental payments.

Stock_Compensation_Plans_Table

Stock Compensation Plans (Tables)	12 Months Ended
	Jan. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of stock option and RSU award activity	'
	The following table summarizes the stock option and RSU award activity during the fiscal year ended January 31, 2014:
					Options Outstanding										RSUs
															Outstanding
		Available			Shares			Weighted-				Weighted-	Aggregate		Shares
		for Grant						Average				Average	Intrinsic
								Exercise				Remaining	Value (1)
								Price				Contractual
								Per Share				Term
													(in thousands)
	Balances as of January 31, 2012	3,315,989			21,905,290			$	1.92
	Additional shares authorized	10,000,000
	Options granted	(3,644,484	)		3,644,484			13.69
	Options exercised	—			(5,529,112	)		1.25
	Options forfeited and expired	1,103,115			(1,103,115	)		4.02
	RSUs granted	(2,957,332	)												2,957,332
	RSUs vested	—													(2,125	)
	RSUs forfeited	50,500													(50,500	)
	Balances as of January 31, 2013	7,867,788			18,917,547			$	4.26			7.69	$	544,606	2,904,707
	Additional shares authorized	5,046,017
	Options granted	(5,000	)		5,000			70.48
	Options exercised	—			(7,254,049	)		3.27
	Options forfeited and expired	574,060			(574,060	)		6.08
	RSUs granted	(8,090,820	)												8,090,820
	RSUs vested	—													(748,880	)
	Shares withheld related to net share settlement of RSUs	273,769
	RSUs forfeited	252,959													(252,959	)
	Balances as of January 31, 2014	5,918,773			11,094,438			$	4.84			6.42	$	800,933	9,993,688
	Vested and expected to vest				10,837,307			$	4.78			6.39	$	783,033	9,494,004
	Exercisable as of January 31, 2014				5,895,562			$	2.61			5.24	$	438,764
	(1) The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of January 31, 2014.
Schedule of allocation of stock-based compensation expense related to stock-based awards, employee stock purchases and restricted stock units	'
	Stock-based compensation expense related to our stock-based awards, employee stock purchases and restricted stock units was allocated as follows:
		Fiscal Year Ended January 31,
	(in thousands)	2014				2013				2012
	Cost of revenues	$	5,283			$	1,217			$	134
	Research and development	20,829				6,170				841
	Sales and marketing	30,012				8,093				1,488
	General and administrative	13,244				4,000				1,297
	Total stock-based compensation expense	$	69,368			$	19,480			$	3,760
Valuation Assumptions	'
Schedule of assumptions that were used to estimate the fair value of the ESPP	'
	The following assumptions were used to estimate the fair value of the ESPP:
		Fiscal Year Ended January 31,
		2014			2013			2012
	Expected volatility	33.9 - 44.4%			42.0 - 49.1%			—
	Risk-free rate	0.08 - 0.13%			0.10 - 0.19%			—
	Dividend yield	—			—			—
	Expected term (in years)	0.05 - 1.00			0.50 - 1.16			—
Employees	'
Valuation Assumptions	'
Schedule of assumptions that were used to estimate the fair value of options granted	'
	The following assumptions were used to estimate the fair value of options granted to employees:
		Fiscal Year Ended January 31,
		2014			2013		2012
	Expected volatility	53.3	%		50.0 - 53.2%		48.4 - 56.5%
	Risk-free rate	1.75	%		0.82 - 1.41%		0.92 - 2.47%
	Dividend yield	—			—		—
	Expected term (in years)	5.97			5.90 - 6.13		5.25 - 6.08
Nonemployees	'
Valuation Assumptions	'
Schedule of assumptions that were used to estimate the fair value of options granted	'
	The following assumptions were used to estimate the fair value of nonemployee options:
		Fiscal Year Ended January 31,
		2014		2013		2012
	Expected volatility	49.8 - 58.0%		49.7 - 51.7%		52.6 - 58.0%
	Risk-free rate	1.37 - 2.52%		1.38 - 1.87%		1.70 - 1.80%
	Dividend yield	—		—		—
	Expected term (in years)	7.45 - 9.12		8.05 - 9.35		9.06 - 9.88

Geographic_Information_Tables

Geographic Information (Tables)	12 Months Ended
	Jan. 31, 2014
Segment Reporting [Abstract]	'
Schedule of revenues by geographic region	'
	The following tables present our revenues by geographic region for the periods presented (in thousands):
		Fiscal Year Ended January 31,
		2014		2013		2012
	United States	$	234,458	$	155,926	$	91,935
	International	68,165		43,018		29,025
	Total revenues	$	302,623	$	198,944	$	120,960
Schedule of property and equipment	'
	The following tables present our property and equipment by geographic region for the periods presented (in thousands):
		As of January 31,
		2014		2013
	United States	$	14,005	$	11,471
	International	1,500		1,734
	Total property and equipment, net	$	15,505	$	13,205

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Jan. 31, 2014
Income Tax Disclosure [Abstract]	'
Schedule of components of income (loss) before income tax expense	'
	Loss before income tax expense consists of the following for the periods shown below (in thousands):
		Fiscal Year Ended January 31,
		2014			2013			2012
	United States	$	(80,900	)	$	(37,613	)	$	(11,318	)
	International	1,898			1,645			504
	Total	$	(79,002	)	$	(35,968	)	$	(10,814	)
Schedule of components of income tax expense	'
	Income tax expense consists of the following for the periods shown below (in thousands):
		Fiscal Year Ended January 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	—		$	—		$	—
	State	178			50			5
	Foreign	1,202			944			173
	Total current tax provision	1,380			994			178
	Deferred tax provision:
	Federal	(1,043		)	—			—
	State	(131		)	—			—
	Foreign	(200		)	(281		)	—
	Total deferred tax provision	(1,374		)	(281		)	—
	Total tax provision	$	6		$	713		$	178
Schedule of reconciliation of federal statutory income tax provision to effective income tax provision	'
	The reconciliation of federal statutory income tax rate to our effective income tax rate is as follows (in thousands):
		Fiscal Year Ended January 31,
		2014			2013			2012
	Expected provision at United States federal statutory rate	$	(26,861	)	$	(12,229	)	$	(3,677	)
	State income taxes - net of federal benefit	(2,124		)	(375		)	(631		)
	Stock options	3,300			4,452			1,064
	Preferred stock warrant	—			—			810
	Research and development tax credits	(6,309		)	(2,725		)	(440		)
	Tax reserve for uncertain tax positions	8			25			99
	Change in valuation allowance	32,069			11,205			2,707
	Non-deductible expenses	866			333			246
	Release of valuation allowance due to acquisitions	(1,173		)	—			—
	Other	230			27			—
	Total tax provision	$	6		$	713		$	178
Schedule of components of deferred tax assets and liabilities	'
	Deferred tax assets and liabilities consist of the following (in thousands):
		Fiscal Year Ended January 31,
		2014			2013
	Deferred tax assets:
	Net operating loss carryforwards	$	18,979		$	9,544
	Accrued liabilities	4,326			3,013
	Tax credit carryforwards	13,314			5,695
	Stock-based compensation	12,667			2,669
	Deferred revenue	13,003			5,270
	Valuation allowance	(57,464		)	(24,460		)
	Total deferred tax assets	4,825			1,731
	Deferred tax liabilities:
	Depreciation and amortization	(4,529		)	(1,450		)
	Total deferred tax liabilities	(4,529		)	(1,450		)
	Net deferred taxes	296			281
	Recorded as:
	Current deferred tax assets	8,614			2,886
	Current valuation allowance	(7,920		)	(2,572		)
	Non-current deferred tax assets	49,147			21,854
	Non-current valuation allowance	(49,545		)	(21,887		)
	Net deferred tax assets	$	296		$	281
Schedule of net operating loss and tax credit carry forwards	'
	Net operating loss and tax credit carry forwards as of January 31, 2014 are as follows (in thousands):
		Amount			Expiration years
	Net operating loss, federal	$	471,420		2025-2034
	Net operating loss, state	107,276			2016-2034
	Tax credit, federal	11,207			2026-2034
	Tax credit, state	10,220			N/A
Schedule of unrecognized tax positions	'
	The remainder will not, if recognized, affect the effective income tax rate due to the valuation allowance that currently offsets deferred tax assets.
		Fiscal Year Ended January 31,
	(in thousands)	2014			2013			2012
	Balance at beginning of year	$	2,105		$	1,056		$	817
	Increase related to prior year tax positions	—			—			—
	Decrease related to prior year tax positions	—			(13		)	—
	Increase related to current year tax positions	2,757			1,062			239
	Settlements with tax authorities	—			—			—
	Decrease related to lapse of statue of limitations	—			—			—
	Balance at end of year	$	4,862		$	2,105		$	1,056

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	12 Months Ended
	Jan. 31, 2014
Earnings Per Share [Abstract]	'
Schedule of computation of historical basic and diluted net loss per share	'
	The following table sets forth the computation of historical basic and diluted net loss per share (in thousands, except per share data):
		Fiscal Year Ended January 31,
		2014				2013			2012
	Numerator:
	Net loss	$	(79,008	)		$	(36,681	)	$	(10,992	)
	Denominator:
	Weighted-average common shares outstanding	105,143				80,465			20,921
	Less: Weighted-average unvested common shares subject to repurchase or forfeiture	(76		)		(219		)	(275		)
	Weighted-average shares used to compute net loss per share, basic and diluted	105,067				80,246			20,646
	Net loss per share, basic and diluted	$	(0.75	)		$	(0.46	)	$	(0.53	)
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive	'
	Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
		As of January 31,
		2014			2013			2012
	Shares subject to outstanding common stock options	11,094,438			18,917,547			21,905,290
	Shares subject to outstanding RSUs	9,993,688			2,904,707			—
	Series A convertible preferred stock	—			—			20,600,000
	Series B convertible preferred stock	—			—			20,304,560
	Series C convertible preferred stock	—			—			16,025,634
	Employee stock purchase plan	56,369			368,848			—
	Shares subject to preferred stock warrants	—			—			469,557
	Total	21,144,495			22,191,102			79,305,041

Description_of_the_Business_an3

Description of the Business and Significant Accounting Policies (Details) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
		segment
Follow-on Offering	'	'	'	'
Shares offered by the stockholders to the public	6,900,000	6,900,000	'	'
Shares of common stock issued pursuant to the full exercise of overallotment option granted to the underwriters	900,000	'	'	'
Share price of shares offered by the stockholders to the public (in dollars per share)	$81	$81	'	'
Proceeds from follow-on offering	$558,900,000	'	'	'
Underwriting discounts and commissions	19,600,000	'	'	'
Proceeds from follow-on offering, net of offering costs	539,300,000	539,339,000	0	0
Segments	'	'	'	'
Number of operating segments	'	1	'	'
Cash and Cash Equivalents and Restricted Cash	'	'	'	'
Amount of cash and cash equivalents invested in money market funds	$864,000,000	$864,000,000	$250,800,000	$19,500,000
Minimum	'	'	'	'
Revenue Recognition	'	'	'	'
Accounts receivable payment terms	'	'30 days	'	'
Maximum	'	'	'	'
Revenue Recognition	'	'	'	'
Accounts receivable payment terms	'	'60 days	'	'

Description_of_the_Business_an4

Description of the Business and Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Changes in the allowance for doubtful accounts	'	'	'
Balance at beginning of period	$821	$557	$400
Add: bad debt expense	140	286	247
Less: write-offs, net of recoveries	-203	-22	-90
Balance at end of period	$758	$821	$557
Cash | Credit concentration	'	'	'
Concentration of Risk	'	'	'
Number of financial institutions	1	'	'
Accounts receivable | Customer concentration	'	'	'
Concentration of Risk	'	'	'
Percentage of concentration	10.00%	31.00%	'
Number of customers	0	1	'

Description_of_the_Business_an5

Description of the Business and Significant Accounting Policies (Details 3)	12 Months Ended
	Jan. 31, 2014
Minimum	'
Property and Equipment	'
Useful Life	'3 years
Maximum	'
Property and Equipment	'
Useful Life	'5 years
Computer equipment and software	'
Property and Equipment	'
Useful Life	'3 years
Furniture and fixtures	'
Property and Equipment	'
Useful Life	'5 years

Description_of_the_Business_an6

Description of the Business and Significant Accounting Policies (Details 4) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2010	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Description of the Business and Significant Accounting Policies	'	'	'	'
Impairment of long-lived asset	'	$2,128,000	$0	$0
Commissions	'	'	'	'
Commission expense	'	54,000,000	26,900,000	22,300,000
Leases	'	'	'	'
Lease rent expenses	'	6,400,000	3,900,000	2,600,000
Advertising Expense	'	'	'	'
Advertising expenses	'	6,300,000	6,000,000	3,700,000
Software development for sale or lease	'	'	'	'
Description of the Business and Significant Accounting Policies	'	'	'	'
Total amortization expenses	'	0	100,000	300,000
Capitalized amount	500,000	'	'	'
Software development for internal use	'	'	'	'
Description of the Business and Significant Accounting Policies	'	'	'	'
Total amortization expenses	'	400,000	'	'
Capitalized amount	'	'	$2,800,000	'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
Fair Value Measurements	'	'	'
Total	$864,000	$250,800	$19,500
Assets:	'	'	'
Total	864,000	250,800	19,500
Net asset value per share of money market funds (in dollars per share)	$1	'	'
Recurring basis | Level 1	'	'	'
Fair Value Measurements	'	'	'
Total	864,012	250,810	'
Assets:	'	'	'
Total	864,012	250,810	'
Recurring basis | Level 2	'	'	'
Fair Value Measurements	'	'	'
Total	0	0	'
Assets:	'	'	'
Total	0	0	'
Recurring basis | Level 3	'	'	'
Fair Value Measurements	'	'	'
Total	0	0	'
Assets:	'	'	'
Total	0	0	'
Recurring basis | Total	'	'	'
Fair Value Measurements	'	'	'
Total	864,012	250,810	'
Assets:	'	'	'
Cash and cash equivalents	864,012	250,810	'
Total	$864,012	$250,810	'

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Property and Equipment	'	'	'
Property and equipment, gross	$32,943	$22,920	'
Less: accumulated depreciation and amortization	-17,438	-9,715	'
Property and equipment, net	15,505	13,205	'
Depreciation and amortization expense	7,723	4,674	2,120
Impairment of long-lived assets	2,128	0	0
Computer equipment and software	'	'	'
Property and Equipment	'	'	'
Property and equipment, gross	20,451	16,077	'
Furniture and fixtures	'	'	'
Property and Equipment	'	'	'
Property and equipment, gross	5,364	2,714	'
Leasehold improvements	'	'	'
Property and Equipment	'	'	'
Property and equipment, gross	$7,128	$4,129	'

Acquisitions_Goodwill_and_Othe2

Acquisitions, Goodwill and Other Intangible Assets (Details Textual) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Sep. 25, 2013	Dec. 06, 2013	Dec. 06, 2013
			BugSense	Cloudmeter	In-process research and development
					Cloudmeter
Business Acquisition [Line Items]	'	'	'	'	'
Purchase price paid in cash	'	'	$9,000,000	$21,000,000	'
Recognized identified intangible assets	'	'	4,700,000	8,500,000	'
Net deferred tax liability	'	'	700,000	600,000	'
Net liabilities assumed	'	'	700,000	200,000	'
Goodwill	19,070,000	0	5,700,000	13,300,000	'
Identifiable Indefinite-lived intangible assets acquired	'	'	'	'	$500,000

Acquisitions_Goodwill_and_Othe3

Acquisitions, Goodwill and Other Intangible Assets (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Sep. 25, 2013	Sep. 25, 2013	Sep. 25, 2013	Sep. 25, 2013	Dec. 06, 2013	Dec. 06, 2013	Dec. 06, 2013	Dec. 06, 2013	Dec. 06, 2013	Dec. 06, 2013	Dec. 06, 2013
	BugSense	BugSense	BugSense	BugSense	Cloudmeter	Cloudmeter	Cloudmeter	Cloudmeter	In-process research and development	Minimum	Maximum
		Developed technology	Customer relationships	Other acquired intangible assets		Developed technology	Customer relationships	Other acquired intangible assets	Cloudmeter	Cloudmeter	Cloudmeter
										Other acquired intangible assets	Other acquired intangible assets
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Identifiable finite-lived intangible assets acquired	$4,730	$2,940	$1,460	$330	$8,470	$7,330	$160	$480	'	'	'
Identifiable Indefinite-lived intangible assets acquired	'	'	'	'	'	'	'	'	$500	'	'
Identifiable acquired intangible assets, useful life	'	'36 months	'36 months	'24 months	'	'48 months	'36 months	'	'	'24 months	'36 months

Acquisitions_Goodwill_and_Othe4

Acquisitions, Goodwill and Other Intangible Assets (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	$12,700
Accumulated Amortization	-906
Total	11,794
Developed technology	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	10,270
Accumulated Amortization	-648
Total	9,622
Weighted Average Remaining Useful Life	'42 months
Customer relationships	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	1,620
Accumulated Amortization	-174
Total	1,446
Weighted Average Remaining Useful Life	'32 months
Other acquired intangible assets	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	810
Accumulated Amortization	-84
Total	$726
Weighted Average Remaining Useful Life	'28 months

Acquisitions_Goodwill_and_Othe5

Acquisitions, Goodwill and Other Intangible Assets (Details 2) (USD $)	Jan. 31, 2014
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'
Fiscal 2015	$3,670
Fiscal 2016	3,628
Fiscal 2017	2,969
Fiscal 2018	1,527
Total	$11,794

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Jan. 31, 2014		Jan. 31, 2013	Jan. 31, 2012	Nov. 16, 2012
Commitments and Contingencies Disclosure [Abstract]	'		'	'	'
Rent expense	$6,400,000		$3,900,000	$2,600,000	'
Operating lease obligations	'		'	'	'
Total	47,936,000	[1]	'	'	'
Less Than 1 year	7,999,000	[1]	'	'	'
1-3 years	16,338,000	[1]	'	'	'
3-5 years	17,114,000	[1]	'	'	'
More Than 5 years	6,485,000	[1]	'	'	'
Operating lease obligations	'		'	'	'
Future minimum sublease rental payments, as an offset to the future minimum rental payments	'		'	'	$1,200,000
[1]	We entered into a sublease agreement on November 16, 2012 for a portion of our office space in the United Kingdom, and the future sublease rental income of $1.2 million has been included as an offset to our future minimum rental payments.

Commitments_and_Contingencies_2

Commitments and Contingencies (Details 2) (Indemnification Arrangements, USD $)	Jan. 31, 2014
Indemnification Arrangements	'
Commitments and Contingencies	'
Accrued obligations	$0

Debt_Financing_Facilities_Deta

Debt Financing Facilities (Details) (Revolving line of credit facility, USD $)	Jan. 31, 2014	9-May-13	Jan. 31, 2014
			LIBOR
Debt Financing Facilities	'	'	'
Maximum borrowing capacity	'	$25,000,000	'
Prime rate (as a percent)	3.25%	'	'
Margin over prime rate (as a percent)	'	'	2.75%
Amount outstanding	$0	'	'

Common_Stock_Details

Common Stock (Details) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Stockholders' Equity Note [Abstract]	'	'
Number of shares of common stock authorized	1,000,000,000	1,000,000,000
Common stock, par value per share (in dollars per share)	$0.00	$0.00
Shares of common stock issued	116,099,516	100,920,350
Common stock, shares outstanding	116,099,516	100,920,350
Early Exercise of Employee Options	'	'
Shares of restricted common stock, subject to a repurchase right	56,250	93,750
Portion of shares from early exercises of employee options for which the repurchase right lapses on the first anniversary of the vesting start date.	0.25	0.25
Portion of shares from early exercises of employee options for which the repurchase right lapses on monthly basis after the first anniversary of the vesting start date.	0.0208	0.0208

Convertible_Preferred_Stock_De

Convertible Preferred Stock (Details) (Warrants to purchase convertible preferred stock, USD $)	3 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2012
Warrants to purchase convertible preferred stock	'
Fair value of the preferred stock warrant liability	'
Expense arising from revaluation	$14.10

Stock_Compensation_Plans_Detai

Stock Compensation Plans (Details)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Available for Grant	'	'
Balances at the beginning of the period (in shares)	7,867,788	3,315,989
Additional shares authorized	5,046,017	10,000,000
Options granted (in shares)	-5,000	-3,644,484
Options exercised (in shares)	0	0
Options forfeited and expired (in shares)	574,060	1,103,115
RSUs granted (in shares)	-8,090,820	-2,957,332
RSUs vested (in shares)	0	0
Shares withheld related to net share settlement of RSUs (in shares)	273,769	'
RSUs forfeited (in shares)	252,959	50,500
Balances at the end of the period (in shares)	5,918,773	7,867,788

Stock_Compensation_Plans_Detai1

Stock Compensation Plans (Details 2) (USD $)	12 Months Ended
	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2012
Stock Compensation Plans	'		'		'
Future grants under 2003 Plan (in shares)	0		'		'
Number of shares available for issuance	5,918,773		7,867,788		3,315,989
Shares	'		'		'
Options granted (in shares)	5,000		3,644,484		'
Options exercised (in shares)	0		0		'
Options forfeited and expired (in shares)	-574,060		-1,103,115		'
Number of Shares	'		'		'
RSUs granted (in shares)	8,090,820		2,957,332		'
RSUs vested (in shares)	0		0		'
RSUs forfeited (in shares)	-252,959		-50,500		'
ESPP	'		'		'
Stock Compensation Plans	'		'		'
Number of shares available for issuance	4,000,000		'		'
Percentage of outstanding shares available for issuance	2.00%		'		'
Employee Stock Purchase Plan	'		'		'
Maximum percentage of eligible compensation that can be used to purchase shares of common stock	15.00%		'		'
Purchase price of shares as a percentage of fair value of common stock	85.00%		'		'
Offering period	'12 months		'		'
2012 plan	'		'		'
Stock Compensation Plans	'		'		'
Number of shares available for issuance	10,000,000		'		'
Percentage of outstanding shares available for issuance	5.00%		'		'
Options	'		'		'
Shares	'		'		'
Outstanding at the beginning of the period (in shares)	18,917,547		21,905,290		'
Options granted (in shares)	5,000		3,644,484		'
Options exercised (in shares)	-7,254,049		-5,529,112		'
Options forfeited and expired (in shares)	-574,060		-1,103,115		'
Outstanding at the end of the period (in shares)	11,094,438		18,917,547		'
Vested and expected to vest at the end of the period (in shares)	10,837,307		'		'
Vested and exercisable at the end of the period (in shares)	5,895,562		'		'
Weighted-Average Exercise Price Per Share	'		'		'
Balances at the beginning of the period (in dollars per share)	4.26		1.92		'
Options granted (in dollars per share)	70.48		13.69		'
Options exercised (in dollars per share)	3.27		1.25		'
Options forfeited (in dollars per share)	6.08		4.02		'
Balances at the end of the period (in dollars per share)	4.84		4.26		'
Vested and expected to vest at the end of the period (in dollars per share)	4.78		'		'
Vested and exercisable at the end of the period (in dollars per share)	2.61		'		'
Weighted-Average Remaining Contractual Term	'		'		'
Balances at the end of the period	'6 years 5 months 1 day		'7 years 8 months 9 days		'
Vested and expected to vest at the end of the period	'6 years 4 months 21 days		'		'
Vested and exercisable at the end of the period	'5 years 2 months 27 days		'		'
Aggregate Intrinsic Value	'		'		'
Outstanding at the end of the period (in dollars)	800,933,000	[1]	544,606,000	[1]	'
Vested and expected to vest at the end of the period (in dollars)	783,033,000	[1]	'		'
Vested and exercisable at the end of the period (in dollars)	438,764,000	[1]	'		'
Number of Shares	'		'		'
Tax benefits that have been realized from exercised stock options	400,000		'		'
Unrecognized compensation cost	'		'		'
Total unrecognized compensation cost related to stock options	19,000,000		31,200,000		'
Weighted-average period over which unrecognized compensation cost is expected to be recognized	'1 year 8 months 16 days		'3 years		'
Additional disclosures	'		'		'
Total intrinsic value of options exercised (in dollars)	359,300,000		134,700,000		'
Weighted-average grant date fair value of options granted (in dollars per share)	35.86		7.65		'
Options | Maximum	'		'		'
Stock Compensation Plans	'		'		'
Terms of options	'10 years		'		'
Voting power of all classes or outstanding stock (as a percent)	10.00%		'		'
Term of an incentive stock option of participant who owns more than 10% of the voting power	'5 years		'		'
RSUs	'		'		'
Stock Compensation Plans	'		'		'
Vesting period	'4 years		'		'
Number of Shares	'		'		'
Balances at the beginning of the period (in shares)	2,904,707		'		'
RSUs granted (in shares)	8,090,820		2,957,332		'
RSUs vested (in shares)	-748,880		-2,125		'
RSUs forfeited (in shares)	-252,959		-50,500		'
Balances at the end of the period (in shares)	9,993,688		2,904,707		'
RSU's vested and expected to vest at the end of the period (in shares)	9,494,004		'		'
Unrecognized compensation cost	'		'		'
Weighted-average period over which unrecognized compensation cost is expected to be recognized	'3 years 6 months 4 days		'		'
Total unrecognized compensation cost	494,600,000		'		'
Additional disclosures	'		'		'
Weighted-average grant date fair value of RSUs granted (in dollars per share)	65.8		'		'
Aggregate intrinsic value of RSUs vested (in dollars)	49,500,000		'		'
[1]	The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of January 31, 2014.

Stock_Compensation_Plans_Detai2

Stock Compensation Plans (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Stock-Based Compensation Expense	'	'	'
Total stock-based compensation expense	$69,368	$19,480	$3,760
Cost of revenues	'	'	'
Stock-Based Compensation Expense	'	'	'
Total stock-based compensation expense	5,283	1,217	134
Research and development	'	'	'
Stock-Based Compensation Expense	'	'	'
Total stock-based compensation expense	20,829	6,170	841
Sales and marketing	'	'	'
Stock-Based Compensation Expense	'	'	'
Total stock-based compensation expense	30,012	8,093	1,488
General and administrative	'	'	'
Stock-Based Compensation Expense	'	'	'
Total stock-based compensation expense	$13,244	$4,000	$1,297

Stock_Compensation_Plans_Detai3

Stock Compensation Plans (Details 4)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
ESPP	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected volatility, minimum (as a percent)	33.90%	42.00%	'
Expected volatility, maximum (as a percent)	44.40%	49.10%	'
Risk-free rate, minimum (as a percent)	0.08%	0.10%	'
Risk-free rate, maximum (as a percent)	0.13%	0.19%	'
Dividend yield (as a percent)	0.00%	0.00%	'
ESPP | Minimum	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected term	'18 days	'6 months	'
ESPP | Maximum	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected term	'1 year	'1 year 1 month 28 days	'
Options | Employees	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected volatility, minimum (as a percent)	'	50.00%	48.40%
Expected volatility (as a percent)	53.30%	'	'
Expected volatility, maximum (as a percent)	'	53.20%	56.50%
Risk-free rate, minimum (as a percent)	'	0.82%	0.92%
Risk-free rate (as a percent)	1.75%	'	'
Risk-free rate, maximum (as a percent)	'	1.41%	2.47%
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Expected term	'5 years 11 months 19 days	'	'
Options | Employees | Minimum	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected term	'	'5 years 10 months 24 days	'5 years 3 months
Options | Employees | Maximum	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected term	'	'6 years 1 month 17 days	'6 years 29 days
Options | Nonemployees	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected volatility, minimum (as a percent)	49.80%	49.70%	52.60%
Expected volatility, maximum (as a percent)	58.00%	51.70%	58.00%
Risk-free rate, minimum (as a percent)	1.37%	1.38%	1.70%
Risk-free rate, maximum (as a percent)	2.52%	1.87%	1.80%
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Options | Nonemployees | Minimum	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected term	'7 years 5 months 12 days	'8 years 18 days	'9 years 22 days
Options | Nonemployees | Maximum	'	'	'
Assumptions used to determine the fair value of options	'	'	'
Expected term	'9 years 1 month 13 days	'9 years 4 months 6 days	'9 years 10 months 17 days

Geographic_Information_Details

Geographic Information (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Revenues	$302,623	$198,944	$120,960
Property and equipment, net	15,505	13,205	'
United States	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Revenues	234,458	155,926	91,935
Property and equipment, net	14,005	11,471	'
International	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'
Revenues	68,165	43,018	29,025
Property and equipment, net	$1,500	$1,734	'

Geographic_Information_Details1

Geographic Information (Details)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
	customer	customer	customer
Revenue | Customer concentration risk	'	'	'
Concentration of Risk	'	'	'
Number of customers accounting for 10 percent or more of the concentration risk	0	0	0
Percentage of concentration	10.00%	10.00%	10.00%
Accounts receivable | Customer concentration risk	'	'	'
Concentration of Risk	'	'	'
Number of customers accounting for 10 percent or more of the concentration risk	0	1	'
Percentage of concentration	10.00%	31.00%	'
Property and equipment | Geographic concentration | United Kingdom	'	'	'
Concentration of Risk	'	'	'
Percentage of concentration	10.00%	13.00%	'
Number of countries	0	1	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Loss before income tax expense	'	'	'
United States	($80,900)	($37,613)	($11,318)
International	1,898	1,645	504
Loss before income taxes	-79,002	-35,968	-10,814
Current tax provision:	'	'	'
Federal	0	0	0
State	178	50	5
Foreign	1,202	944	173
Total current tax provision	1,380	994	178
Deferred tax provision:	'	'	'
Federal	-1,043	0	0
State	-131	0	0
Foreign	-200	-281	0
Total deferred tax provision	-1,374	-281	0
Total tax provision	6	713	178
Reconciliation of federal statutory income tax provision to effective income tax provision	'	'	'
Expected provision at United States federal statutory rate	-26,861	-12,229	-3,677
State income taxes - net of federal benefit	-2,124	-375	-631
Stock options	3,300	4,452	1,064
Preferred stock warrant	0	0	810
Research and development tax credits	-6,309	-2,725	-440
Tax reserve for uncertain tax positions	8	25	99
Change in valuation allowance	32,069	11,205	2,707
Non-deductible expenses	866	333	246
Release of valuation allowance due to acquisitions	-1,173	0	0
Other	230	27	0
Total tax provision	$6	$713	$178

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
In Thousands, unless otherwise specified
Deferred tax assets:	'	'	'
Net operating loss carryforwards	$18,979	$9,544	'
Accrued liabilities	4,326	3,013	'
Tax credit carryforwards	13,314	5,695	'
Stock-based compensation	12,667	2,669	'
Deferred revenue	13,003	5,270	'
Valuation allowance	-57,464	-24,460	-19,400
Total deferred tax assets	4,825	1,731	'
Deferred tax liabilities:	'	'	'
Depreciation and amortization	-4,529	-1,450	'
Total deferred tax liabilities	-4,529	-1,450	'
Net deferred taxes	296	281	'
Recorded as:	'	'	'
Current deferred tax assets	8,614	2,886	'
Current valuation allowance	-7,920	-2,572	'
Non-current deferred tax assets	49,147	21,854	'
Non-current valuation allowance	-49,545	-21,887	'
Net deferred taxes	$296	$281	'

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Net operating loss and tax credit carry forwards	'	'	'
Deferred tax assets valuation allowance	$57,464,000	$24,460,000	$19,400,000
Net change in valuation allowance	34,200,000	'	'
Excess tax benefits from exercised stock options	144,300,000	37,600,000	'
Liability for uncertain tax position	4,862,000	2,105,000	1,056,000
Liability for unrecognized tax positions that would, if recognized, impact the entity's effective tax rate	200,000	'	'
Unrecognized tax benefit	'	'	'
Balance at beginning of year	2,105,000	1,056,000	817,000
Increase related to prior year tax positions	0	0	0
Decrease related to prior year tax positions	0	-13,000	0
Increase related to current year tax positions	2,757,000	1,062,000	239,000
Settlements with tax authorities	0	0	0
Decrease related to lapse of statue of limitations	0	0	0
Balance at end of year	4,862,000	2,105,000	1,056,000
Accrued interest and penalties related to unrecognized tax benefits	99,000	90,000	'
Undistributed earnings of foreign subsidiaries	5,000,000	'	'
California Enterprise Zone	'	'	'
Net operating loss and tax credit carry forwards	'	'	'
Tax credit	1,400,000	'	'
Federal	'	'	'
Net operating loss and tax credit carry forwards	'	'	'
Net operating loss	471,420,000	'	'
Tax credit	11,207,000	'	'
Federal | Research and development	'	'	'
Net operating loss and tax credit carry forwards	'	'	'
Tax credit	20,000,000	'	'
State	'	'	'
Net operating loss and tax credit carry forwards	'	'	'
Net operating loss	107,276,000	'	'
Tax credit	10,220,000	'	'
State | Research and development	'	'	'
Net operating loss and tax credit carry forwards	'	'	'
Tax credit	'	$4,900,000	'

Net_Loss_Per_Share_Details

Net Loss Per Share (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Numerator	'	'	'
Net loss	($79,008)	($36,681)	($10,992)
Denominator:	'	'	'
Weighted-average common shares outstanding	105,143	80,465	20,921
Less: Weighted-average unvested common shares subject to repurchase or forfeiture	-76	-219	-275
Weighted-average shares used to compute net loss per share, basic and diluted	105,067	80,246	20,646
Net loss per share	'	'	'
Net loss per share, basic and diluted (in dollars per share)	($0.75)	($0.46)	($0.53)

Net_Loss_Per_Share_Details_2

Net Loss Per Share (Details 2)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	21,144,495	22,191,102	79,305,041
Shares subject to outstanding common stock options	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	11,094,438	18,917,547	21,905,290
Shares subject to outstanding RSUs	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	9,993,688	2,904,707	0
Series A convertible preferred stock	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	0	0	20,600,000
Series B convertible preferred stock	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	0	0	20,304,560
Series C convertible preferred stock	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	0	0	16,025,634
Employee stock purchase plan	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	56,369	368,848	0
Shares subject to preferred stock warrants	'	'	'
Potentially dilutive securities	'	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	0	0	469,557

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Related Party Transactions [Abstract]	'	'	'
Revenue from sales to the related party	$3,100,000	$2,000,000	$1,600,000
Accounts receivable from the related party	0	0	'
Expenses related to purchases from the related party	1,400,000	900,000	300,000
Accounts payable to related party	$0	$0	'