Splunk (SPLK) 10-Q 9 Sep 14 2015 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jul. 31, 2014	Sep. 02, 2014
Document and Entity Information	'	'
Entity Registrant Name	'SPLUNK INC	'
Entity Central Index Key	'0001353283	'
Document Type	'10-Q	'
Document Period End Date	31-Jul-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--01-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	119,916,714
Document Fiscal Year Focus	'2015	'
Document Fiscal Period Focus	'Q2	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$645,398	$897,453
Investments, current portion	192,217	0
Accounts receivable, net	69,838	83,348
Prepaid expenses and other current assets	9,465	12,019
Total current assets	916,918	992,820
Investments, non-current	96,590	0
Property and equipment, net	33,852	15,505
Intangible assets, net	12,969	12,294
Goodwill	19,070	19,070
Other assets	2,217	642
Total assets	1,081,616	1,040,331
Current liabilities:	'	'
Accounts payable	2,636	2,079
Accrued payroll and compensation	37,212	43,876
Accrued expenses and other liabilities	21,175	12,743
Deferred revenue, current portion	164,278	149,156
Total current liabilities	225,301	207,854
Deferred revenue, non-current	42,717	43,165
Other liabilities, non-current	18,797	4,404
Total non-current liabilities	61,514	47,569
Total liabilities	286,815	255,423
Commitments and contingencies (Note 3)	'	'
Stockholders' equity:	'	'
Common stock: $0.001 par value; 1,000,000,000 shares authorized; 119,749,474 shares issued and outstanding at July 31, 2014, and 116,099,516 shares issued and outstanding at January 31, 2014	120	116
Accumulated other comprehensive income	42	58
Additional paid-in capital	1,075,883	954,441
Accumulated deficit	-281,244	-169,707
Total stockholders' equity	794,801	784,908
Total liabilities and stockholders' equity	$1,081,616	$1,040,331

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jul. 31, 2014	Jan. 31, 2014
Statement of Financial Position [Abstract]	'	'
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	119,749,474	116,099,516
Common stock, shares outstanding	119,749,474	116,099,516

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended				6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2014	Jul. 31, 2013
Revenues	'		'		'	'
License	$62,081		$43,185		$113,355	$79,357
Maintenance and services	39,466		23,688		74,099	44,723
Total revenues	101,547		66,873		187,454	124,080
Cost of revenues	'		'		'	'
License	72	[1]	76	[1]	150	145
Maintenance and services	14,999	[1]	7,345	[1]	29,108	13,957
Total cost of revenues	15,071	[1]	7,421	[1]	29,258	14,102
Gross profit	86,476		59,452		158,196	109,978
Operating expenses	'		'		'	'
Research and development	34,179	[1]	16,210	[1]	63,921	30,674
Sales and marketing	79,978	[1]	44,634	[1]	151,056	85,947
General and administrative	32,676	[1]	11,912	[1]	53,679	22,358
Total operating expenses	146,833	[1]	72,756	[1]	268,656	138,979
Operating loss	-60,357		-13,304		-110,460	-29,001
Interest and other income (expense), net	'		'		'	'
Interest income (expense), net	163		58		293	119
Other income (expense), net	-54		-82		-274	-176
Total interest and other income (expense), net	109		-24		19	-57
Loss before income taxes	-60,248		-13,328		-110,441	-29,058
Provision for income taxes	534		365		1,096	769
Net loss	($60,782)		($13,693)		($111,537)	($29,827)
Net loss per share:	'		'		'	'
Basic and diluted (in dollars per share)	($0.51)		($0.13)		($0.94)	($0.29)
Weighted-average shares outstanding:	'		'		'	'
Basic and diluted (in shares)	119,012		104,100		118,165	103,075
[1]	Amounts include stock-based compensation expense, as follows: Cost of revenues, $3,808 thousand, $865 thousand, $7,614 thousand and $1,570 thousand; Research and development, $13,578 thousand, $3,547 thousand, 26,165 thousand and 6,590 thousand; Sales and marketing, $21,263 thousand, and $5,156 thousand , 40,383 thousand and 9,478 thousand; General and administrative, $20,861 thousand, $2,389 thousand , 28,587 thousand and 4,154 thousand for the three and six months ended July 31, 2014 and 2013, respectively.

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Stock-based compensation expense	'	'	$102,749	$21,792
Cost of revenues	'	'	'	'
Stock-based compensation expense	3,808	865	7,614	1,570
Research and development	'	'	'	'
Stock-based compensation expense	13,578	3,547	26,165	6,590
Sales and marketing	'	'	'	'
Stock-based compensation expense	21,263	5,156	40,383	9,478
General and administrative	'	'	'	'
Stock-based compensation expense	$20,861	$2,389	$28,587	$4,154

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Net loss	($60,782)	($13,693)	($111,537)	($29,827)
Other comprehensive gain (loss):	'	'	'	'
Net unrealized gain on investments	-10	0	-4	0
Foreign currency translation adjustments	-41	-94	-12	-108
Total other comprehensive loss	-51	-94	-16	-108
Comprehensive loss	($60,833)	($13,787)	($111,553)	($29,935)

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Cash flows from operating activities	'	'
Net loss	($111,537)	($29,827)
Adjustments to reconcile net loss to net cash provided by operating activities	'	'
Depreciation and amortization	5,538	2,880
Amortization of investment premiums	136	0
Stock-based compensation expense	102,749	21,792
Deferred income taxes	-513	-120
Excess tax benefit from employee stock plans	-868	-268
Changes in operating assets and liabilities	'	'
Accounts receivable, net	13,510	23,202
Prepaid expenses, other current and non-current assets	1,492	-3,477
Accounts payable	391	-147
Accrued compensation	-6,664	-6,235
Accrued expenses and other liabilities	9,339	5,379
Deferred revenue	14,674	12,923
Net cash provided by operating activities	28,247	26,102
Cash flows from investing activities	'	'
Purchases of investments	-303,953	0
Maturities of investments	15,000	0
Acquisitions, net of cash acquired	2,500	0
Purchases of property and equipment	-7,146	-3,230
Net cash used in investing activities	-298,599	-3,230
Cash flows from financing activities	'	'
Proceeds from exercise of stock options	9,418	12,523
Excess tax benefit from employee stock plans	868	268
Proceeds from employee stock purchase plans	8,355	6,076
Taxes paid related to net share settlement of equity awards	0	-513
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	-523	0
Net cash provided by financing activities	18,118	18,354
Effect of exchange rate changes on cash and cash equivalents	179	-51
Net increase in cash and cash equivalents	-252,055	41,175
Cash and cash equivalents	'	'
Beginning of period	897,453	305,939
End of period	645,398	347,114
Supplemental disclosures	'	'
Cash paid for income taxes	585	246
Non-cash investing and financing activities	'	'
Accrued purchases of property and equipment	1,472	767
Vesting of early exercised options	56	55
Capitalized construction costs related to build-to-suit lease	$14,668	$0

Description_of_the_Business_an

Description of the Business and Significant Accounting Policies	6 Months Ended
	Jul. 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. We were incorporated in California in October 2003 and reincorporated in Delaware in May 2006.
	Fiscal Year
	Our fiscal year ends on January 31. References to fiscal 2015 or fiscal year 2015, for example, refer to the fiscal year ending January 31, 2015.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet data as of January 31, 2014 was derived from audited financial statements, but does not include all disclosures required by GAAP. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K for the fiscal year ended January 31, 2014, filed with the SEC on March 31, 2014. There have been no changes in the significant accounting policies from those that were disclosed in the audited consolidated financial statements for the fiscal year ended January 31, 2014 included in the Annual Report on Form 10-K.
	In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to state fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2015.
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The effective date will be the first quarter of fiscal year 2018 using one of two retrospective application methods. We have not determined the potential effects on our condensed consolidated financial statements.
	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. The adoption of this guidance did not have an impact on our condensed consolidated financial statements.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP 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 unaudited condensed consolidated financial statements include the accounts of Splunk Inc. and its direct and indirect 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 or six months ended July 31, 2014 and 2013. 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.
	Investments
	We determine the appropriate classification of our investments at the time of purchase and reevaluate such determination at each balance sheet date. Securities are classified as available-for-sale and are carried at fair value, with the change in unrealized gains and losses, net of tax, reported as a separate component on the consolidated statements of comprehensive loss. Fair value is determined based on quoted market rates when observable or utilizing data points that are observable, such as quoted prices, interest rates and yield curves. Declines in fair value judged to be other-than-temporary on securities available for sale are included as a component of investment income. In order to determine whether a decline in value is other-than-temporary, we evaluate, among other factors the duration and extent to which the fair value has been less than the carrying value and our intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. The cost of securities sold is based on the specific-identification method. Interest on securities classified as available-for-sale is included as a component of interest income.

Investments_and_Fair_Value_Mea

Investments and Fair Value Measurements	6 Months Ended
	Jul. 31, 2014
Investments, Debt And Equity Securities And Fair Value Disclosures [Abstract]	'
Investments and Fair Value Measurements	'
	Investments and 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 July 31, 2014 and January 31, 2014 (in thousands):
		31-Jul-14									31-Jan-14
		Level 1		Level 2		Level 3			Total		Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds	$	610,279	$	—	$	—		$	610,279	$	864,012	$	—	$	—	$	864,012
	U.S. treasury securities	$	—	$	288,807	$	—		$	288,807	$	—	$	—	$	—	$	—
	Reported as:
	Assets:
	Cash and cash equivalents								$	610,279							$	864,012
	Investments, current portion								192,217								—
	Investments, non-current								96,590								—
	Total								$	899,086							$	864,012
	We invested in U.S. treasury securities during the six months ended July 31, 2014, which we have classified as available-for-sale securities. The following table presents our available-for-sale investments as of July 31, 2014 (in thousands):
		31-Jul-14
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	Cash and cash equivalents:
	U.S. treasury securities	$	—	$	—	$	—		$	—
	Investments, current portion:
	U.S. treasury securities	192,213		17		(13		)	192,217
	Investments, non-current:
	U.S. treasury securities	96,604		23		(37		)	96,590
	Total available-for-sale investments	$	288,817	$	40	$	(50	)	$	288,807
	As of July 31, 2014, we did not consider any of our investments to be other-than-temporarily impaired.
	The contractual maturities of our investments are as follows (in thousands):
		31-Jul-14
	Due within one year	$	192,217
	Due within one to two years	96,590
	Total	$	288,807
	Investments with maturities of less than 12 months from the balance sheet date are classified as current assets, which are available for use to fund current operations. Investments with maturities greater than 12 months from the balance sheet date are classified as long-term assets.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Office Lease Commitments
	We lease our office spaces under non-cancelable leases with rent expense recognized on a straight-line basis over the lease term. Rent expense was $2.7 million and $1.2 million for the three months ended July 31, 2014 and 2013, respectively, and $4.9 million and $2.4 million for the six months ended July 31, 2014 and 2013, respectively.
	On April 29, 2014, we entered into an office lease (the "Lease") for approximately 182,000 square feet located at 270 Brannan Street, San Francisco, California (the "Premises"). The Premises will be allocated to approximately 95,000 square feet of rentable space (the "Initial Premises") which we expect to occupy in January 2016 and approximately 87,000 square feet of rentable space (the "Must-Take Premises") which we expect to occupy one year thereafter, for a term of 84 months, subject to the completion of certain pre-occupancy improvements by our landlord. Our total obligation for the base rent is approximately $92.0 million. On May 13, 2014, we entered into an irrevocable, standby letter of credit with Silicon Valley Bank for $6.0 million to serve as a security deposit for our office lease with 270 Brannan Street, LLC, San Francisco, California.
	As a result of our involvement during the construction period, we are considered, for accounting purposes only, the owner of the construction project under build-to-suit lease accounting. We recorded estimated project construction costs incurred by the landlord as an asset and a corresponding long term liability in “Property and equipment, net” and “Other liabilities, non-current” respectively, on our condensed consolidated balance sheets. Had we capitalized the construction project under build-to-suit lease accounting as of our first quarter of fiscal 2015, we would have recorded estimated project construction costs incurred by the landlord as an asset and a corresponding long term liability of $12.0 million on our condensed consolidated balance sheets. We will increase the asset and corresponding long term liability as additional building costs are incurred by the landlord during the construction period. Once the landlord completes the construction of the Initial Premises, which is estimated to be in January 2016, we will evaluate the Lease in order to determine whether or not the Lease meets the criteria for “sale-leaseback” treatment.
	The following summarizes our contractual commitments and obligations as of July 31, 2014:
		Payments Due by Period*
		Total		Less Than 1		1-3 years		3-5 years		More Than 5
				year						years
		(in thousands)
	Office lease obligations	$	150,785	$	9,379	$	33,664	$	43,133	$	64,609
	_________________________
	*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 $1.0 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 each of 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 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, directors and certain employees, indemnifying them for certain events or occurrences while they serve as our officers or directors or those of our direct and indirect subsidiaries.
	To date, there have not been any costs incurred in connection with such indemnification obligations; therefore, there is no accrual of such amounts at July 31, 2014.  We are unable to estimate the maximum potential impact of these indemnifications on our future results of operations.

Property_and_Equipment

Property and Equipment	6 Months Ended
	Jul. 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
		31-Jul-14			31-Jan-14
	Computer equipment and software	$	24,335		$	20,451
	Furniture and fixtures	6,856			5,364
	Leasehold improvements	9,147			7,128
	Construction in progress (1)	14,668			—
		55,006			32,943
	Less: accumulated depreciation and amortization	(21,154		)	(17,438		)
	Property and equipment, net	$	33,852		$	15,505
	(1) This relates to the capitalization of construction costs in connection with our build-to-suit lease obligation, where we are considered the owner of the asset, for accounting purposes only, during the construction period. There is a corresponding long-term liability for this obligation on our condensed consolidated balance sheets under “Other liabilities, non-current.” Refer to Note 3 “Commitments and Contingencies” for details.
	Depreciation and amortization expense on Property and Equipment, net was $2.0 million and $1.3 million for the three months ended July 31, 2014 and 2013, respectively, and $3.7 million and $2.6 million for the six months ended July 31, 2014 and 2013, respectively.

Acquisitions_Goodwill_and_Inta

Acquisitions, Goodwill and Intangible Assets	6 Months Ended
	Jul. 31, 2014
Business Combinations [Abstract]	'
Acquisitions, Goodwill and 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 during any of the periods presented on our Condensed Consolidated Statement 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, except Useful Life):
		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, except Useful Life):
		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 obtained from acquisitions as of July 31, 2014 are as follows (in thousands, except Useful Life):
		Gross Fair Value		Accumulated Amortization			Net Book Value		Weighted Average Remaining Useful Life
									(months)
	Developed technology	$	12,770	$	(2,038	)	$	10,732	36
	Customer relationships	1,620		(441		)	1,179		26
	Other acquired intangible assets	810		(252		)	558		22
	Total intangible assets subject to amortization	$	15,200	$	(2,731	)	$	12,469
	Additionally, we obtained $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 July 31, 2014 is as follows (in thousands):
	Fiscal Period:
	Remaining six months of fiscal 2015	$	2,122
	Fiscal 2016	4,462
	Fiscal 2017	3,802
	Fiscal 2018	2,083
	Total amortization expense	$	12,469

Debt_Financing_Facilities

Debt Financing Facilities	6 Months Ended
	Jul. 31, 2014
Debt Disclosure [Abstract]	'
Debt Financing Facilities	'
	Debt Financing Facilities
	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 July 2014) or the LIBOR rate plus 2.75%. As of July 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 July 31, 2014.

Stock_Compensation_Plans

Stock Compensation Plans	6 Months Ended
	Jul. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Compensation Plans	'
	Stock Compensation Plans
	The following table summarizes the stock option and restricted stock unit ("RSU") award activity during the six months ended July 31, 2014:
				Options Outstanding							RSUs
											Outstanding
		Shares 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, 2014	5,918,773		11,094,438		$	4.84	6.42	$	800,933	9,993,688
	Additional Shares Authorized	5,804,975
	Options granted	(40,000	)	40,000		88.64
	Options exercised	—		(2,668,154	)	3.53
	Options forfeited and expired	230,097		(230,097	)	7.2
	RSUs granted	(1,754,907	)								1,754,907
	RSUs vested	—									-765,530
	RSUs forfeited	596,576									(596,576	)
	Balances as of July 31, 2014	10,755,514		8,236,187		$	5.6	6.23	$	342,905	10,386,489
	Vested and expected to vest			8,066,089		$	5.53	6.21	$	336,359	9,867,165
	Exercisable as of July 31, 2014			4,796,725		$	3.17	5.41	$	210,346
	(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 July 31, 2014.
	During fiscal 2015, we began requiring that employees sell a portion of the shares that they receive upon the vesting of RSUs in order to cover any required withholding taxes, rather than our previous approach of net share settlement.
	During the six months ended July 31, 2014, $0.9 million of tax benefits have been realized from exercised stock options. At July 31, 2014, there was a total unrecognized compensation cost of $14.2 million related to these stock options, adjusted for estimated forfeitures, which is expected to be recognized over a weighted-average period of 1.32 years. At July 31, 2014, total unrecognized compensation cost was $477.6 million related to RSUs, adjusted for estimated forfeitures, which is expected to be recognized over the next 3.15 years.
	The total intrinsic value of options exercised during the six months ended July 31, 2014 was $185.1 million. The weighted-average grant date fair value of RSUs granted was $58.98 per share for the six months ended July 31, 2014.

Geographic_Information

Geographic Information	6 Months Ended
	Jul. 31, 2014
Segment Reporting [Abstract]	'
Geographic Information	'
	Geographic Information
	Revenues
	Revenues by geography are based on the shipping address of the customer. The following table presents our revenues by geographic region for the periods presented (in thousands):
		Three Months Ended July 31,				Six Months Ended July 31,
		2014		2013		2014		2013
	United States	$	76,026	$	52,752	$	140,705	$	97,755
	International	25,521		14,121		46,749		26,325
	Total Revenues	$	101,547	$	66,873	$	187,454	$	124,080
	Other than the United States, no other individual country exceeded 10% of total revenues during any of the periods presented. At July 31, 2014, there was one channel partner that represented approximately 15% of total accounts receivable and approximately 14% and 12% of total revenues during the three months and six months ended July 31, 2014, respectively. The accounts receivable and revenues from this channel partner is comprised of a number of customer transactions, none of which were individually greater than 10% of total accounts receivable at July 31, 2014 or total revenues for the three months or six months ended July 31, 2014. At January 31, 2014, no customer or channel partner represented greater than 10% of total accounts receivable.
	Property and Equipment
	The following table presents our property and equipment by geographic region for the periods presented (in thousands):
		As of
		July 31, 2014		January 31, 2014
	United States	$	31,321	$	14,005
	International	2,531		1,500
	Total property and equipment, net	$	33,852	$	15,505
	Other than the United States, no other country represented 10% or more of our total property and equipment as of July 31, 2014 or January 31, 2014.

Income_Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	For the three months ended July 31, 2014 and 2013, we recorded $0.5 million and $0.4 million in income tax expense, respectively. The increase in income tax expense was primarily due to an increase in taxable income in our international jurisdictions and state franchise tax. For the six months ended July 31, 2014 and 2013, we recorded $1.1 million and $0.8 million in income tax expense, respectively. The increase was primarily due to increase in taxable income in our international jurisdictions and state franchise tax.
	There were no material changes to our unrecognized tax benefits in the six months ended July 31, 2014, and we do not expect to have any significant changes to unrecognized tax benefits through the end of the fiscal year. Because of our history of tax losses, all years remain open to tax audit.

Net_Loss_Per_Share

Net Loss Per Share	6 Months Ended
	Jul. 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):
		Three Months Ended July 31,							Six Months Ended July 31,
		2014				2013			2014			2013
	Numerator:
	Net loss	$	(60,782	)		$	(13,693	)	$	(111,537	)	$	(29,827	)
	Denominator:
	Weighted-average common shares outstanding	119,055				104,181			118,213			103,160
	Less: Weighted-average unvested common shares subject to repurchase or forfeiture	(43		)		(81		)	(48		)	(85		)
	Weighted-average shares used to compute net loss per share, basic and diluted	119,012				104,100			118,165			103,075
	Net loss per share, basic and diluted	$	(0.51	)		$	(0.13	)	$	(0.94	)	$	(0.29	)
	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 potential common shares 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 (in thousands):
		As of July 31,
		2014			2013
	Shares subject to outstanding common stock options	8,236			14,783
	Shares subject to outstanding RSUs	10,386			3,809
	Employee stock purchase plan	337			277
	Total	18,959			18,869

Related_Party_Transactions

Related Party Transactions	6 Months Ended
	Jul. 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 revenues from sales to these companies of $0.8 million and $0.7 million for the three months ended July 31, 2014 and 2013, respectively, and $1.5 million and $1.2 million for the six months ended July 31, 2014 and 2013, respectively. We also recorded $0.5 million and $0.3 million in expenses related to purchases from these companies during the three months ended July 31, 2014 and 2013, respectively, and $1.0 million and $0.6 million for the six months ended July 31, 2014 and 2013, respectively. We had $0.2 million and $0 of accounts receivable from these companies as of July 31, 2014 and January 31, 2014, respectively. There were no accounts payable to these companies as of July 31, 2014 or January 31, 2014.

Description_of_the_Business_an1

Description of the Business and Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 31, 2014
Accounting Policies [Abstract]	'
Fiscal Year	'
	Fiscal Year
	Our fiscal year ends on January 31. References to fiscal 2015 or fiscal year 2015, for example, refer to the fiscal year ending January 31, 2015.
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet data as of January 31, 2014 was derived from audited financial statements, but does not include all disclosures required by GAAP. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K for the fiscal year ended January 31, 2014, filed with the SEC on March 31, 2014. There have been no changes in the significant accounting policies from those that were disclosed in the audited consolidated financial statements for the fiscal year ended January 31, 2014 included in the Annual Report on Form 10-K.
	In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to state fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2015.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with GAAP 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 unaudited condensed consolidated financial statements include the accounts of Splunk Inc. and its direct and indirect 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 or six months ended July 31, 2014 and 2013. 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.
Investments	'
	Investments
	We determine the appropriate classification of our investments at the time of purchase and reevaluate such determination at each balance sheet date. Securities are classified as available-for-sale and are carried at fair value, with the change in unrealized gains and losses, net of tax, reported as a separate component on the consolidated statements of comprehensive loss. Fair value is determined based on quoted market rates when observable or utilizing data points that are observable, such as quoted prices, interest rates and yield curves. Declines in fair value judged to be other-than-temporary on securities available for sale are included as a component of investment income. In order to determine whether a decline in value is other-than-temporary, we evaluate, among other factors the duration and extent to which the fair value has been less than the carrying value and our intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. The cost of securities sold is based on the specific-identification method. Interest on securities classified as available-for-sale is included as a component of interest income.

Investments_and_Fair_Value_Mea1

Investments and Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2014
Investments, Debt And Equity Securities And 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 July 31, 2014 and January 31, 2014 (in thousands):
		31-Jul-14									31-Jan-14
		Level 1		Level 2		Level 3			Total		Level 1		Level 2		Level 3		Total
	Assets:
	Money market funds	$	610,279	$	—	$	—		$	610,279	$	864,012	$	—	$	—	$	864,012
	U.S. treasury securities	$	—	$	288,807	$	—		$	288,807	$	—	$	—	$	—	$	—
	Reported as:
	Assets:
	Cash and cash equivalents								$	610,279							$	864,012
	Investments, current portion								192,217								—
	Investments, non-current								96,590								—
	Total								$	899,086							$	864,012
Schedule of available-for-sale securities reconciliation	'
	We invested in U.S. treasury securities during the six months ended July 31, 2014, which we have classified as available-for-sale securities. The following table presents our available-for-sale investments as of July 31, 2014 (in thousands):
		31-Jul-14
		Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	Cash and cash equivalents:
	U.S. treasury securities	$	—	$	—	$	—		$	—
	Investments, current portion:
	U.S. treasury securities	192,213		17		(13		)	192,217
	Investments, non-current:
	U.S. treasury securities	96,604		23		(37		)	96,590
	Total available-for-sale investments	$	288,817	$	40	$	(50	)	$	288,807
Investments classified by contractual maturity date	'
	The contractual maturities of our investments are as follows (in thousands):
		31-Jul-14
	Due within one year	$	192,217
	Due within one to two years	96,590
	Total	$	288,807

Property_and_Equipment_Tables

Property and Equipment (Tables)	6 Months Ended
	Jul. 31, 2014
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	Property and equipment consisted of the following (in thousands):
		As of
		31-Jul-14			31-Jan-14
	Computer equipment and software	$	24,335		$	20,451
	Furniture and fixtures	6,856			5,364
	Leasehold improvements	9,147			7,128
	Construction in progress (1)	14,668			—
		55,006			32,943
	Less: accumulated depreciation and amortization	(21,154		)	(17,438		)
	Property and equipment, net	$	33,852		$	15,505

Acquisitions_Goodwill_and_Inta1

Acquisitions, Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jul. 31, 2014
Business Acquisition [Line Items]	'
Schedule of finite-lived intangible assets	'
	Intangible assets subject to amortization obtained from acquisitions as of July 31, 2014 are as follows (in thousands, except Useful Life):
		Gross Fair Value		Accumulated Amortization			Net Book Value		Weighted Average Remaining Useful Life
									(months)
	Developed technology	$	12,770	$	(2,038	)	$	10,732	36
	Customer relationships	1,620		(441		)	1,179		26
	Other acquired intangible assets	810		(252		)	558		22
	Total intangible assets subject to amortization	$	15,200	$	(2,731	)	$	12,469
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 July 31, 2014 is as follows (in thousands):
	Fiscal Period:
	Remaining six months of fiscal 2015	$	2,122
	Fiscal 2016	4,462
	Fiscal 2017	3,802
	Fiscal 2018	2,083
	Total amortization expense	$	12,469
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, except Useful Life):
		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, except Useful Life):
		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

Stock_Compensation_Plans_Table

Stock Compensation Plans (Tables)	6 Months Ended
	Jul. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share Based Compensation Stock Options and Restricted Stock Units Award Activity [Table Text Block]	'
	The following table summarizes the stock option and restricted stock unit ("RSU") award activity during the six months ended July 31, 2014:
				Options Outstanding							RSUs
											Outstanding
		Shares 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, 2014	5,918,773		11,094,438		$	4.84	6.42	$	800,933	9,993,688
	Additional Shares Authorized	5,804,975
	Options granted	(40,000	)	40,000		88.64
	Options exercised	—		(2,668,154	)	3.53
	Options forfeited and expired	230,097		(230,097	)	7.2
	RSUs granted	(1,754,907	)								1,754,907
	RSUs vested	—									-765,530
	RSUs forfeited	596,576									(596,576	)
	Balances as of July 31, 2014	10,755,514		8,236,187		$	5.6	6.23	$	342,905	10,386,489
	Vested and expected to vest			8,066,089		$	5.53	6.21	$	336,359	9,867,165
	Exercisable as of July 31, 2014			4,796,725		$	3.17	5.41	$	210,346
	(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 July 31, 2014.

Geographic_Information_Tables

Geographic Information (Tables)	6 Months Ended
	Jul. 31, 2014
Segment Reporting [Abstract]	'
Schedule of revenues by geographic region	'
	Revenues by geography are based on the shipping address of the customer. The following table presents our revenues by geographic region for the periods presented (in thousands):
		Three Months Ended July 31,				Six Months Ended July 31,
		2014		2013		2014		2013
	United States	$	76,026	$	52,752	$	140,705	$	97,755
	International	25,521		14,121		46,749		26,325
	Total Revenues	$	101,547	$	66,873	$	187,454	$	124,080
Schedule of property and equipment	'
	The following table presents our property and equipment by geographic region for the periods presented (in thousands):
		As of
		July 31, 2014		January 31, 2014
	United States	$	31,321	$	14,005
	International	2,531		1,500
	Total property and equipment, net	$	33,852	$	15,505

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	6 Months Ended
	Jul. 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):
		Three Months Ended July 31,							Six Months Ended July 31,
		2014				2013			2014			2013
	Numerator:
	Net loss	$	(60,782	)		$	(13,693	)	$	(111,537	)	$	(29,827	)
	Denominator:
	Weighted-average common shares outstanding	119,055				104,181			118,213			103,160
	Less: Weighted-average unvested common shares subject to repurchase or forfeiture	(43		)		(81		)	(48		)	(85		)
	Weighted-average shares used to compute net loss per share, basic and diluted	119,012				104,100			118,165			103,075
	Net loss per share, basic and diluted	$	(0.51	)		$	(0.13	)	$	(0.94	)	$	(0.29	)
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 (in thousands):
		As of July 31,
		2014			2013
	Shares subject to outstanding common stock options	8,236			14,783
	Shares subject to outstanding RSUs	10,386			3,809
	Employee stock purchase plan	337			277
	Total	18,959			18,869

Description_of_the_Business_an2

Description of the Business and Significant Accounting Policies (Details)	6 Months Ended
	Jul. 31, 2014
	segment
Accounting Policies [Abstract]	'
Number of operating segments	1

Investments_and_Fair_Value_Mea2

Investments and Fair Value Measurements (Details) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Fair Value Measurements	'	'
U.S. treasury securities	$288,807	'
Recurring basis | Level 1	'	'
Fair Value Measurements	'	'
Money market funds	610,279	864,012
U.S. treasury securities	0	0
Recurring basis | Level 2	'	'
Fair Value Measurements	'	'
Money market funds	0	0
U.S. treasury securities	288,807	0
Recurring basis | Level 3	'	'
Fair Value Measurements	'	'
Money market funds	0	0
U.S. treasury securities	0	0
Recurring basis | Total	'	'
Fair Value Measurements	'	'
Money market funds	610,279	864,012
U.S. treasury securities	288,807	0
Assets:	'	'
Cash and cash equivalents	610,279	864,012
Investments, current portion	192,217	0
Investments, non-current	96,590	0
Total	$899,086	$864,012

Investments_and_Fair_Value_Mea3

Investments and Fair Value Measurements - Amortized Cost to Fair Value Reconciliation (Details) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
U.S. treasury securities, Fair Value	$288,807
US Treasury Securities	'
Schedule of Available-for-sale Securities [Line Items]	'
U.S. treasury securities, Amortized Cost	288,817
U.S. treasury securities, Unrealized Gains	40
U.S. treasury securities, Unrealized Losses	-50
U.S. treasury securities, Fair Value	288,807
US Treasury Securities | Cash and Cash Equivalents	'
Schedule of Available-for-sale Securities [Line Items]	'
U.S. treasury securities, Amortized Cost	0
U.S. treasury securities, Unrealized Gains	0
U.S. treasury securities, Unrealized Losses	0
U.S. treasury securities, Fair Value	0
US Treasury Securities | Investments, Current Portion	'
Schedule of Available-for-sale Securities [Line Items]	'
U.S. treasury securities, Amortized Cost	192,213
U.S. treasury securities, Unrealized Gains	17
U.S. treasury securities, Unrealized Losses	-13
U.S. treasury securities, Fair Value	192,217
US Treasury Securities | Investments, Non-current	'
Schedule of Available-for-sale Securities [Line Items]	'
U.S. treasury securities, Amortized Cost	96,604
U.S. treasury securities, Unrealized Gains	23
U.S. treasury securities, Unrealized Losses	-37
U.S. treasury securities, Fair Value	$96,590

Investments_and_Fair_Value_Mea4

Investments and Fair Value Measurements - Contractual Maturities (Details) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Investments, Debt And Equity Securities And Fair Value Disclosures [Abstract]	'
Due within one year	$192,217
Due within one to two years	96,590
Total	$288,807

Commitments_and_Contingencies_

Commitments and Contingencies Commitments and Contingencies (Details) (USD $)	3 Months Ended			6 Months Ended
	Jul. 31, 2014		Jul. 31, 2013	Jul. 31, 2014		Jul. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'		'	'		'
Rent expense	$2,700,000		$1,200,000	$4,900,000		$2,400,000
Operating lease obligations, Total	150,785,000	[1]	'	150,785,000	[1]	'
Operating lease obligations, Less than 1 year	9,379,000	[1]	'	9,379,000	[1]	'
Operating lease obligations, 1-3 years	33,664,000	[1]	'	33,664,000	[1]	'
Operating lease obligations, 3-5 years	43,133,000	[1]	'	43,133,000	[1]	'
Operating lease obligations, More than 5 years	64,609,000	[1]	'	64,609,000	[1]	'
Future sublease rental income	$1,000,000		'	$1,000,000		'
[1]	We entered into a sublease agreement on NovemberB 16, 2012 for a portion of our office space in the United Kingdom, and the future sublease rental income of $1.0 million has been included as an offset to our future minimum rental payments.

Commitments_and_Contingencies_1

Commitments and Contingencies - Office Lease (Details) (USD $)	6 Months Ended
	Jul. 31, 2014		13-May-14	Apr. 30, 2014	Apr. 29, 2014
					sqft
Operating Leased Assets [Line Items]	'		'	'	'
Base rent obligation	$150,785,000	[1]	'	'	'
270 Brannan Street, San Francisco, CA	'		'	'	'
Operating Leased Assets [Line Items]	'		'	'	'
Area of leased property	'		'	'	182,000
Term of office lease	'84 months		'	'	'
Base rent obligation	92,000,000		'	'	'
Amount to be Maintained in Letter of Credit as Security for Lease Agreement	'		6,000,000	'	'
Construction in Progress, Gross	'		'	$12,000,000	'
270 Brannan Street, San Francisco, CA | Lease Arrangement, To Be Obtained in 2016	'		'	'	'
Operating Leased Assets [Line Items]	'		'	'	'
Area of leased property	95,000		'	'	'
270 Brannan Street, San Francisco, CA | Lease Arrangement, To Be Obtained One Year After 2016	'		'	'	'
Operating Leased Assets [Line Items]	'		'	'	'
Area of leased property	87,000		'	'	'
[1]	We entered into a sublease agreement on NovemberB 16, 2012 for a portion of our office space in the United Kingdom, and the future sublease rental income of $1.0 million has been included as an offset to our future minimum rental payments.

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jan. 31, 2014
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment, gross	$55,006,000	'	$55,006,000	'	$32,943,000
Less: accumulated depreciation and amortization	-21,154,000	'	-21,154,000	'	-17,438,000
Property and equipment, net	33,852,000	'	33,852,000	'	15,505,000
Depreciation and amortization expense	2,000,000	1,300,000	3,700,000	2,600,000	'
Computer equipment and software	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment, gross	24,335,000	'	24,335,000	'	20,451,000
Furniture and fixtures	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment, gross	6,856,000	'	6,856,000	'	5,364,000
Leasehold improvements	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment, gross	9,147,000	'	9,147,000	'	7,128,000
Construction in progress	'	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'	'
Property and equipment, gross	$14,668,000	'	$14,668,000	'	$0

Acquisitions_Goodwill_and_Inta2

Acquisitions, Goodwill and Intangible Assets (Details Textual) (USD $)	Jul. 31, 2014	Jan. 31, 2014	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	19,070,000	5,700,000	13,300,000	'
Identifiable Indefinite-lived intangible assets acquired	'	'	'	'	$500,000

Acquisitions_Goodwill_and_Inta3

Acquisitions, Goodwill and 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_Inta4

Acquisitions, Goodwill and Intangible Assets (Details 1) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	$15,200
Accumulated Amortization	-2,731
Total	12,469
Developed technology	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	12,770
Accumulated Amortization	-2,038
Total	10,732
Weighted Average Remaining Useful Life	'36 months
Customer relationships	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	1,620
Accumulated Amortization	-441
Total	1,179
Weighted Average Remaining Useful Life	'26 months
Other acquired intangible assets	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Fair Value	810
Accumulated Amortization	-252
Total	$558
Weighted Average Remaining Useful Life	'22 months

Acquisitions_Goodwill_and_Inta5

Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'
Remaining six months of fiscal 2015	$2,122
Fiscal 2016	4,462
Fiscal 2017	3,802
Fiscal 2018	2,083
Total	$12,469

Debt_Financing_Facilities_Deta

Debt Financing Facilities (Details) (Revolving line of credit facility, USD $)	Jul. 31, 2014	9-May-13	Jul. 31, 2014
			London Interbank Offered Rate (LIBOR)
Debt Financing Facilities	'	'	'
Maximum borrowing capacity	'	$25,000,000	'
Prime rate	3.25%	'	'
Basis spread on variable rate	'	'	2.75%
Amount outstanding	$0	'	'

Stock_Compensation_Plans_Detai

Stock Compensation Plans (Details)	6 Months Ended
	Jul. 31, 2014
Available for Grant	'
Balances at the beginning of the period (in shares)	5,918,773
Additional Shares Authorized (in shares)	5,804,975
Options granted (in shares)	-40,000
Options exercised (in shares)	0
Options forfeited and expired (in shares)	230,097
RSUs granted (in shares)	-1,754,907
RSU's forfeited (in shares)	596,576
Balances at the end of the period (in shares)	10,755,514

Stock_Compensation_Plans_Detai1

Stock Compensation Plans (Details 2) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2014		Jul. 31, 2014		Jan. 31, 2014
Shares	'		'		'
Options granted (in shares)	'		40,000		'
Options exercised (in shares)	'		0		'
Options forfeited and expired (in shares)	'		-230,097		'
Number of Shares	'		'		'
RSUs granted (in shares)	'		1,754,907		'
RSUs forfeited (in shares)	'		-596,576		'
Options	'		'		'
Shares	'		'		'
Outstanding at the beginning of the period (in shares)	'		11,094,438		'
Options granted (in shares)	'		40,000		'
Options exercised (in shares)	'		-2,668,154		'
Options forfeited and expired (in shares)	'		-230,097		'
Outstanding at the end of the period (in shares)	8,236,187		8,236,187		11,094,438
Vested and expected to vest at the end of the period (in shares)	8,066,089		8,066,089		'
Exercisable at the end of the period (in shares)	4,796,725		4,796,725		'
Weighted-Average Exercise Price Per Share	'		'		'
Balances at the beginning of the period (in dollars per share)	'		$4.84		'
Options granted (in dollars per share)	'		$88.64		'
Options exercised (in dollars per share)	'		$3.53		'
Options forfeited (in dollars per share)	'		$7.20		'
Balances at the end of the period (in dollars per share)	$5.60		$5.60		$4.84
Vested and expected to vest at the end of the period (in dollars per share)	$5.53		$5.53		'
Exercisable at the end of the period (in dollars per share)	$3.17		$3.17		'
Weighted-Average Remaining Contractual Term	'		'		'
Balances at the end of the period	'		'6 years 2 months 23 days		'6 years 5 months 1 day
Vested and expected to vest at the end of the period	'		'6 years 2 months 16 days		'
Vested and exercisable at the end of the period	'		'5 years 4 months 28 days		'
Aggregate Intrinsic Value	'		'		'
Outstanding at the end of the period (in dollars)	$342,905,000	[1]	$342,905,000	[1]	$800,933,000	[1]
Vested and expected to vest at the end of the period (in dollars)	336,359,000	[1]	336,359,000	[1]	'
Vested and exercisable at the end of the period (in dollars)	210,346,000	[1]	210,346,000	[1]	'
Tax benefits	'		'		'
Tax benefits that have been realized from exercised stock options	'		900,000		'
Unrecognized compensation cost	'		'		'
Total unrecognized compensation cost related to stock options	14,200,000		14,200,000		'
Weighted-average period over which unrecognized compensation cost is expected to be recognized	'1 year 3 months 26 days		'		'
Additional disclosures	'		'		'
Total intrinsic value of options exercised (in dollars)	'		185,100,000		'
RSUs	'		'		'
Number of Shares	'		'		'
Balances at the beginning of the period (in shares)	'		9,993,688		'
RSUs granted (in shares)	'		1,754,907		'
RSUs vested (in shares)	'		-765,530		'
RSUs forfeited (in shares)	'		-596,576		'
Balances at the end of the period (in shares)	10,386,489		10,386,489		'
RSU's vested and expected to vest at the end of the period (in shares)	9,867,165		9,867,165		'
Unrecognized compensation cost	'		'		'
Weighted-average period over which unrecognized compensation cost is expected to be recognized	'3 years 1 month 24 days		'		'
Total unrecognized compensation cost	$477,600,000		$477,600,000		'
Additional disclosures	'		'		'
Weighted-average grant date fair value of RSUs granted (in dollars per share)	'		$58.98		'
[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 JulyB 31, 2014.

Geographic_Information_Details

Geographic Information (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Revenues by geographic region	'	'	'	'
Revenue	$101,547	$66,873	$187,454	$124,080
United States	'	'	'	'
Revenues by geographic region	'	'	'	'
Revenue	76,026	52,752	140,705	97,755
International	'	'	'	'
Revenues by geographic region	'	'	'	'
Revenue	$25,521	$14,121	$46,749	$26,325

Geographic_Information_Geograp

Geographic Information Geographic Information Narrative (Details)	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jul. 31, 2014	Jan. 31, 2014	Jul. 31, 2014	Jul. 31, 2014	Jul. 31, 2014	Jan. 31, 2014
	Customer concentration risk	Customer concentration risk	Customer concentration risk	Customer concentration risk	Geographic concentration	Geographic concentration
	Accounts receivable	Accounts receivable	Revenues	Revenues	Property and equipment	Property and equipment
	customer	customer	customer	customer	United States	United States
Concentration Risk [Line Items]	'	'	'	'	'	'
Number of customers accounting for 10 percent or more of the concentration risk	1	0	1	1	'	'
Concentration risk, percentage	15.00%	10.00%	14.00%	12.00%	10.00%	10.00%

Geographic_Information_Details1

Geographic Information (Details 2) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Property and Equipment by Geographic Area	'	'
Property and equipment	$33,852	$15,505
United States	'	'
Property and Equipment by Geographic Area	'	'
Property and equipment	31,321	14,005
International	'	'
Property and Equipment by Geographic Area	'	'
Property and equipment	$2,531	$1,500

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Income tax expense (benefit)	$534	$365	$1,096	$769

Net_Loss_Per_Share_Details

Net Loss Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Numerator	'	'	'	'
Net loss	($60,782)	($13,693)	($111,537)	($29,827)
Denominator:	'	'	'	'
Weighted-average common shares outstanding (in shares)	119,055	104,181	118,213	103,160
Less: Weighted-average unvested common shares subject to repurchase or forfeiture (in shares)	-43	-81	-48	-85
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	119,012	104,100	118,165	103,075
Net loss per share	'	'	'	'
Net loss per share, basic and diluted (in dollars per share)	($0.51)	($0.13)	($0.94)	($0.29)

Net_Loss_Per_Share_Details_2

Net Loss Per Share (Details 2)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Potentially dilutive securities	'	'
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive (in shares)	18,959	18,869
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)	8,236	14,783
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)	10,386	3,809
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)	337	277

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jan. 31, 2014
Related Party Transactions [Abstract]	'	'	'	'	'
Revenue from sales to the related party	$800,000	$700,000	$1,500,000	$1,200,000	'
Expenses related to purchases from the related party	500,000	300,000	1,000,000	600,000	'
Accounts receivable from the related party	200,000	'	200,000	'	0
Accounts payable to related parties	$0	'	$0	'	$0