Workday (WDAY) 10-Q 2 Dec 13 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2013
Document And Entity Information [Abstract]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	31-Oct-13
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q3
Trading Symbol	'WDAY
Entity Registrant Name	'Workday, Inc.
Entity Central Index Key	'0001327811
Current Fiscal Year End Date	'--01-31
Entity Filer Category	'Non-accelerated Filer
Entity Common Stock, Shares Outstanding	175

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$183,460	$84,158	[1]
Marketable securities	1,099,235	706,181	[1]
Accounts receivable, net	86,961	67,437	[1]
Deferred costs	14,352	9,816	[1]
Prepaid expenses and other current assets	21,594	16,710	[1]
Total current assets	1,405,602	884,302	[1]
Property and equipment, net	73,960	44,585	[1]
Deferred costs, noncurrent	18,039	18,575	[1]
Goodwill and intangible assets, net	8,488	8,488	[1]
Other assets	22,096	3,130	[1]
Total assets	1,528,185	959,080	[1]
Current liabilities:	'	'
Accounts payable	8,228	2,665	[1]
Accrued expenses and other current liabilities	17,890	13,558	[1]
Accrued compensation	46,250	27,203	[1]
Capital leases	10,044	12,008	[1]
Unearned revenue	279,290	199,340	[1]
Total current liabilities	361,702	254,774	[1]
Convertible senior notes, net	463,092	'
Capital leases, noncurrent	5,546	12,972	[1]
Unearned revenue, noncurrent	72,479	85,920	[1]
Other liabilities	11,964	13,131	[1]
Total liabilities	914,783	366,797	[1]
Stockholders' equity:	'	'
Common stock	172	162	[1]
Additional paid-in capital	1,131,453	993,933	[1]
Accumulated other comprehensive income	184	68	[1]
Accumulated deficit	-518,407	-401,880	[1]
Total stockholders' equity	613,402	592,283	[1]
Total liabilities and stockholders' equity	$1,528,185	$959,080	[1]
[1]	Amounts as of January 31, 2013 were derived from the January 31, 2013 audited financial statements.

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013		Oct. 31, 2012		Oct. 31, 2013		Oct. 31, 2012
Income Statement [Abstract]	'		'		'		'
Revenues	$127,872		$72,618		$327,072		$192,138
Costs and expenses:	'		'		'		'
Costs of revenues	48,591	[1]	30,194	[1]	126,044	[1]	83,549	[1]
Research and development	49,349	[1]	28,075	[1]	126,799	[1]	72,413	[1]
Sales and marketing	54,051	[1]	32,584	[1]	136,565	[1]	87,051	[1]
General and administrative	16,280	[1]	22,633	[1]	42,970	[1]	36,310	[1]
Total costs and expenses	168,271	[1]	113,486	[1]	432,378	[1]	279,323	[1]
Operating loss	-40,399		-40,868		-105,306		-87,185
Other expense, net	-6,893		-364		-10,628		-1,036
Loss before provision for income taxes	-47,292		-41,232		-115,934		-88,221
Provision for income taxes	242		78		593		25
Net loss	-47,534		-41,310		-116,527		-88,246
Accretion of redeemable convertible preferred stock	'		-161		'		-568
Net loss attributable to common stockholders	($47,534)		($41,471)		($116,527)		($88,814)
Net loss per share attributable to common stockholders, basic and diluted	($0.27)		($0.67)		($0.68)		($2.06)
Weighted-average shares used to compute net loss per share attributable to common stockholders	174,385		61,960		171,269		43,053
[1]	Costs and expenses include share-based compensation as follows: Costs of revenues $ 2,342 $ 609 $ 4,281 $ 1,101 Research and development 7,032 1,300 12,404 2,227 Sales and marketing 4,583 970 7,431 1,838 General and administrative 5,726 3,273 12,766 4,714

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Costs of revenues [Member]	'	'	'	'
Allocated share-based compensation expense	$2,342	$609	$4,281	$1,101
Research and development [Member]	'	'	'	'
Allocated share-based compensation expense	7,032	1,300	12,404	2,227
Sales and marketing [Member]	'	'	'	'
Allocated share-based compensation expense	4,583	970	7,431	1,838
General and administrative [Member]	'	'	'	'
Allocated share-based compensation expense	$5,726	$3,273	$12,766	$4,714

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net loss	($47,534)	($41,310)	($116,527)	($88,246)
Other comprehensive loss, net of tax:	'	'	'	'
Changes in foreign currency translation adjustment	32	6	-54	2
Net change in unrealized gains on available-for-sale investments	41	1	170	27
Other comprehensive income, net of tax	73	7	116	29
Comprehensive loss	($47,461)	($41,303)	($116,411)	($88,217)

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013		Oct. 31, 2012
Cash flows from operating activities	'	'	'		'
Net loss	($47,534)	($41,310)	($116,527)		($88,246)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:	'	'	'		'
Depreciation and amortization	9,361	4,461	23,981		11,938
Share-based compensation expense	19,683	6,152	36,882		9,880
Amortization of deferred costs	3,211	2,750	8,449		8,336
Amortization of debt discount and issuance costs	5,764	'	8,554		'
Donation of common stock to Workday Foundation	'	11,250	'		11,250
Other	86	11	256		41
Changes in operating assets and liabilities:	'	'	'		'
Accounts receivable	-19,997	7,382	-19,674		-6,632
Deferred costs	-5,346	-4,673	-12,449		-11,426
Prepaid expenses and other assets	-2,652	-3,395	-12,794		-7,744
Accounts payable	1,891	-253	5,563		73
Accrued expenses and other liabilities	16,458	3,575	22,720		13,738
Unearned revenue	26,151	4,692	66,509		64,066
Net cash provided by (used in) operating activities	7,076	-9,358	11,470		5,274
Cash flows from investing activities	'	'	'		'
Purchases of marketable securities	-499,787	-288,659	-1,229,488		-374,599
Maturities of marketable securities	256,240	19,845	833,107		72,785
Purchases of property and equipment	-16,757	-801	-48,384		-6,803
Other	'	'	90		'
Net cash used in investing activities	-260,304	-269,615	-444,675		-308,617
Cash flows from financing activities	'	'	'		'
Proceeds of initial public offering, net of issuance costs	'	684,620	'		684,620
Proceeds from borrowings on convertible senior notes, net of issuance costs	'	'	584,291		'
Proceeds from issuance of warrants	'	'	92,708		'
Purchase of convertible senior notes hedges	'	'	-143,729		'
Proceeds from exercise of stock options	2,637	2,955	9,312		10,085
Principal payments on capital lease obligations	-2,817	-2,369	-9,505		-5,912
Other	-596	'	-516		'
Net cash provided by (used in) financing activities	-776	685,206	532,561		688,793
Effect of exchange rate changes	32	6	-54		1
Net increase (decrease) in cash and cash equivalents	-253,972	406,239	99,302		385,451
Cash and cash equivalents at the beginning of period	437,432	36,741	84,158	[1]	57,529
Cash and cash equivalents at the end of period	183,460	442,980	183,460		442,980
Supplemental cash flow data	'	'	'		'
Cash paid for interest	264	304	991		891
Non-cash investing and financing activities:	'	'	'		'
Property and equipment acquired under capital leases	'	13,663	115		17,887
Accretion of redeemable convertible preferred stock	'	161	'		568
Vesting of early exercise stock options	398	278	1,974		490
Purchases of property and equipment, accrued but not paid	$1,360	'	$1,360		'
[1]	Amounts as of January 31, 2013 were derived from the January 31, 2013 audited financial statements.

Overview_and_Basis_of_Presenta

Overview and Basis of Presentation	9 Months Ended
	Oct. 31, 2013
Accounting Policies [Abstract]	'
Overview and Basis of Presentation	'
	Note 1. Overview and Basis of Presentation
	Company and Background
	Workday provides enterprise cloud applications for human capital management (HCM), payroll, financial management, grants management, time tracking, procurement, employee expense management and analytics. We offer innovative and adaptable technology focused on the consumer Internet experience and cloud delivery model. Our applications are designed for global enterprises to manage complex and dynamic operating environments. We provide our customers highly adaptable, accessible and reliable applications to manage critical business functions that enable them to optimize their financial and human capital resources. We are incorporated in Delaware.
	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. The condensed consolidated financial statements include the results of Workday, Inc. and its wholly-owned subsidiaries. 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. In the opinion of our management, the information contained herein reflects all adjustments necessary for a fair presentation of Workday’s results of operations, financial position and cash flows. All such adjustments are of a normal, recurring nature. The results of operations for the three and nine months ended October 31, 2013 shown in this report are not necessarily indicative of results to be expected for the full year ending January 31, 2014. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements in our Annual Report on Form 10-K for the year ended January 31, 2013, filed on March 22, 2013. There have been no changes to our significant accounting policies described in the annual report that have had a material impact on our condensed consolidated financial statements and related notes.
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with GAAP requires us to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. These estimates include, but are not limited to, the determination of the relative selling prices for our services, the recoverability of deferred costs and certain assumptions used in the valuation of equity awards. Actual results could differ from those estimates and such differences could be material to our consolidated financial position and results of operations.
	Segment Information
	We operate in one operating segment, cloud applications. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assessing performance. Our chief operating decision maker allocates resources and assesses performance based upon discrete financial information at the consolidated level. Since we operate in one operating segment, all required financial segment information can be found in the condensed consolidated financial statements.

Marketable_Securities

Marketable Securities	9 Months Ended
	Oct. 31, 2013
Cash And Cash Equivalents [Abstract]	'
Marketable Securities	'
	Note 2. Marketable Securities
	At October 31, 2013, marketable securities consisted of the following (in thousands):
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. agency obligations	$	956,043	$	198	$	(46	)	$	956,195
	U.S. treasury securities		163,548		74		(2	)		163,620
	Commercial paper		63,786		—		—			63,786
	U.S. corporate securities		11,825		4		—			11,829
	Money market funds		41,115		—		—			41,115
		$	1,236,317	$	276	$	(48	)	$	1,236,545
	Included in cash and cash equivalents	$	137,310	$	—	$	—		$	137,310
	Included in marketable securities	$	1,099,007	$	276	$	(48	)	$	1,099,235
	At January 31, 2013, marketable securities consisted of the following (in thousands):
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. agency obligations	$	614,171	$	64	$	(11	)	$	614,224
	U.S. treasury securities		65,174		5		—			65,179
	Commercial paper		64,538		1		—			64,539
	Certificates of deposit		250		—		—			250
	U.S. corporate securities		8,128		—		(1	)		8,127
	Money market funds		17,395		—		—			17,395
		$	769,656	$	70	$	(12	)	$	769,714
	Included in cash and cash equivalents	$	63,533	$	—	$	—		$	63,533
	Included in marketable securities	$	706,123	$	70	$	(12	)	$	706,181
	As of October 31, 2013, we do not believe the unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence, which includes our intent to hold these investments to maturity. No marketable securities held as of October 31, 2013 have been in a continuous unrealized loss position for more than twelve months. We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification as of each balance sheet date. We may sell these securities at any time for use in current operations or for other purposes, such as consideration for acquisitions, even if they have not yet reached maturity. As a result, we classify our investments, including securities with maturities beyond twelve months, as current assets in the accompanying condensed consolidated balance sheets. Marketable securities on the condensed consolidated balance sheets consist of securities with original maturities at the time of purchase of greater than three months.

Deferred_Costs

Deferred Costs	9 Months Ended
	Oct. 31, 2013
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'
Deferred Costs	'
	Note 3. Deferred Costs
	Deferred costs consisted of the following (in thousands):
		October 31,		January 31,
		2013		2013
	Current:
	Deferred professional service costs	$	3,500	$	1,654
	Deferred sales commissions		10,852		8,162
	Total	$	14,352	$	9,816
	Noncurrent:
	Deferred professional service costs	$	5,106	$	6,843
	Deferred sales commissions		12,933		11,732
	Total	$	18,039	$	18,575

Property_and_Equipment_Net

Property and Equipment, Net	9 Months Ended
	Oct. 31, 2013
Property Plant And Equipment [Abstract]	'
Property and Equipment, Net	'
	Note 4. Property and Equipment, Net
	Property and equipment consisted of the following (in thousands):
		October 31,			January 31,
		2013			2013
	Computers, equipment and software	$	65,996		$	28,770
	Computers, equipment and software acquired under capital leases		39,415			39,300
	Furniture and fixtures		6,609			4,689
	Leasehold improvements		17,176			6,581
			129,196			79,340
	Less accumulated depreciation and amortization		(55,236	)		(34,755	)
	Property and equipment, net	$	73,960		$	44,585
	Depreciation expense totaled $7.9 million and $4.1 million for the three months ended October 31, 2013 and 2012, respectively, and $20.5 million and $10.8 million for the nine months ended October 31, 2013 and 2012, respectively.
	These amounts include depreciation of assets recorded under capital leases of $3.0 million and $2.8 million for the three months ended October 31, 2013 and 2012, respectively and $9.4 million and $6.8 million for the nine months ended October 31, 2013 and 2012, respectively.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Oct. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Note 5. Fair Value Measurements
	We value our marketable securities using quoted prices for identical instruments in active markets when available. If we are unable to value our marketable securities using quoted prices for identical instruments in active markets, we value our investments using independent pricing vendors’ reports that utilize quoted market prices for comparable instruments. We validate, on a sample basis, the derived prices provided by the independent pricing vendors by comparing their assessment of the fair values of our investments against the fair values of the portfolio balances of another third-party professional’s pricing service. To date, all of our marketable securities can be valued using one of these two methodologies.
	We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy that requires we maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:
	Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2 — Other inputs that are directly or indirectly observable in the marketplace.
	Level 3 — Unobservable inputs that are supported by little or no market activity.
	Based on our valuation of our marketable securities, we concluded that they are classified in either Level 1 or Level 2 and we have no financial assets or liabilities measured using Level 3 inputs. The following tables present information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
		Fair Value Measurements as of
		31-Oct-13
	Description	Level 1		Level 2		Total
	U.S. agency obligations	$	—	$	956,195	$	956,195
	U.S. treasury securities		163,620		—		163,620
	Commercial paper		—		63,786		63,786
	U.S. corporate securities		—		11,829		11,829
	Money market funds		41,115		—		41,115
		$	204,735	$	1,031,810	$	1,236,545
	Included in cash and cash equivalents					$	137,310
	Included in marketable securities					$	1,099,235
		Fair Value Measurements as of
		January 31, 2013
	Description	Level 1		Level 2		Total
	U.S. agency obligations	$	—	$	614,224	$	614,224
	U.S. treasury securities		65,179		—		65,179
	Commercial paper		—		64,539		64,539
	Certificates of deposit		—		250		250
	U.S. corporate securities		—		8,127		8,127
	Money market funds		17,395		—		17,395
		$	82,574	$	687,140	$	769,714
	Included in cash and cash equivalents					$	63,533
	Included in marketable securities					$	706,181
	The carrying amounts and estimated fair values of financial instruments not recorded at fair value are as follows (in thousands):
		October 31, 2013
		Carrying		Estimated
		Amount		Fair Value
	0.75% Convertible Senior Notes	$	278,004	$	395,500
	1.50% Convertible Senior Notes		185,088		290,313
	The estimated fair value of the above convertible senior notes, which we have classified as Level 2 financial instruments, was determined based on the quoted bid price of the above convertible senior notes in an over-the-counter market on October 31, 2013.
	Based on the closing price of our common stock of $74.87 on October 31, 2013, the if-converted value of the 0.75% convertible senior notes and the if-converted value of the 1.50% convertible senior notes were less than their respective principal amounts.

Convertible_Senior_Notes

Convertible Senior Notes

9 Months Ended

Oct. 31, 2013

Debt Disclosure [Abstract]

'

Convertible Senior Notes

'

Note 6. Convertible Senior Notes

Convertible Senior Notes

In June 2013, we issued 0.75% convertible senior notes due July 15, 2018 (2018 Notes) with a principal amount of $350.0 million. The 2018 Notes are unsecured, unsubordinated obligations, and interest is payable in cash in arrears at a fixed rate of 0.75% on January 15 and July 15 of each year, beginning on January 15, 2014. The 2018 Notes mature on July 15, 2018 unless repurchased or converted in accordance with their terms prior to such date. We cannot redeem the 2018 Notes prior to maturity.

Concurrently, we issued 1.50% convertible senior notes due July 15, 2020 (2020 Notes) with a principal amount of $250.0 million (together with the 2018 Notes, referred to as Notes). The 2020 Notes are unsecured, unsubordinated obligations of Workday, and interest is payable in cash in arrears at a fixed rate of 1.50% on January 15 and July 15 of each year, beginning on January 15, 2014. The 2020 Notes mature on July 15, 2020 unless repurchased or converted in accordance with their terms prior to such date. We cannot redeem the 2020 Notes prior to maturity.

The terms of the Notes are governed by Indentures by and between us and Wells Fargo Bank, National Association, as Trustee (the Indentures). Upon conversion, holders of the Notes will receive cash, shares of Class A Common Stock or a combination of cash and shares of Class A Common Stock, at our election.

For the 2018 Notes, the initial conversion rate is 12.0075 shares of Class A Common Stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $83.28 per share of Class A Common Stock, subject to adjustment. Prior to the close of business on March 14, 2018, the conversion is subject to the satisfaction of certain conditions as described below. For the 2020 Notes, the initial conversion rate is 12.2340 shares of Class A Common Stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $81.74 per share of Class A Common Stock, subject to adjustment. Prior to the close of business on March 13, 2020, the conversion is subject to the satisfaction of certain conditions, as described below.

Holders of the Notes who convert their Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indentures) are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indentures), holders of the Notes may require us to repurchase all or a portion of their Notes at a price equal to 100% of the principal amount of the Notes, plus any accrued and unpaid interest.

Holders of the 2018 Notes and 2020 Notes may convert all or a portion of their Notes prior to the close of business on March 14, 2018 for the 2018 Notes and March 13, 2020 for the 2020 Notes, in multiples of $1,000 principal amount, only under the following circumstances:

•

if the last reported sale price of Class A Common Stock for at least twenty trading days during a period of thirty consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price of the respective Notes on each applicable trading day;

•

during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the respective Notes for each day of that five day consecutive trading day period was less than 98% of the product of the last reported sale price of Class A Common Stock and the conversion rate of the respective Notes on such trading day; or

•

upon the occurrence of specified corporate events, as noted in the Indentures.

In accounting for the issuance of the Notes, we separated each of the Notes into liability and equity components. The carrying amounts of the liability components were calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity components representing the conversion option were determined by deducting the fair value of the liability components from the par value of the respective Notes. These differences represent debt discounts that are amortized to interest expense over the respective terms of the Notes. The equity components are not remeasured as long as they continue to meet the conditions for equity classification.

We allocated the total issuance costs incurred to the 2018 Notes and 2020 Notes on a prorated basis using the aggregate principal balances. In accounting for the issuance costs related to the 2018 Notes and 2020 Notes, we allocated the total amount of issuance costs incurred to liability and equity components. Issuance costs attributable to the liability components are being amortized to interest expense over the respective terms of the Notes, and the issuance costs attributable to the equity components were netted against the respective equity components in additional paid-in capital. For the 2018 Notes, we recorded liability issuance costs of $7.2 million and equity issuance costs of $2.0 million. Amortization expense for the liability issuance costs was $0.3 million and $0.5 million, respectively, in the three and nine months ended October 31, 2013. For the 2020 Notes, we recorded liability issuance costs of $4.7 million and equity issuance costs of $1.8 million. Amortization expense for the liability issuance costs was $0.2 million and $0.3 million in the three and nine months ended October 31, 2013.

The Notes consisted of the following (in thousands):

As of October 31,

2013

2018 Notes

2020 Notes

Principal amounts:

Principal

$

350,000

$

250,000

Unamortized debt discount(1)

(71,996

)

(64,912

)

Net carrying amount

$

278,004

$

185,088

Carrying amount of the equity component(2)

$

74,892

$

66,007

(1)

Included in the condensed consolidated balance sheets within Convertible senior notes, net and amortized over the remaining lives of the Notes on the straight-line basis as it approximates the effective interest rate method.

(2)

Included in the condensed consolidated balance sheets within Additional paid-in capital, net of $2.0 million and $1.8 million for the 2018 Notes and 2020 Notes, respectively, in equity issuance costs.

As of October 31, 2013, the remaining life of the 2018 Notes and 2020 Notes is approximately 56 months and 80 months, respectively.

The effective interest rates of the liability components of the 2018 Notes and 2020 Notes are 5.75% and 6.25%, respectively. These interest rates were based on the interest rates of similar liabilities at the time of issuance that did not have associated convertible features. The following table sets forth total interest expense recognized related to the 2018 Notes and 2020 Notes (in thousands, except percentages):

Three Months ended

Nine Months ended

October 31, 2013

October 31, 2013

2018 Notes

2020 Notes

2018 Notes

2020 Notes

Contractual interest expense

$

656

$

938

$

977

$

1,396

Interest cost related to amortization of debt issuance costs

352

169

524

251

Interest cost related to amortization of the debt discount

3,308

1,935

4,909

2,870

Notes Hedges

In connection with the issuance of the 2018 Notes and 2020 Notes, we entered into convertible note hedge transactions with respect to our Class A Common Stock (Purchased Options). The Purchased Options cover, subject to anti-dilution adjustments substantially identical to those in the Notes, approximately 7.3 million shares of our Class A Common Stock and are exercisable upon conversion of the Notes. The Purchased Options have initial exercise prices that correspond to the initial conversion prices of the 2018 Notes and 2020 Notes, respectively, subject to anti-dilution adjustments substantially similar to those in the Notes. The Purchased Options will expire in 2018 for the 2018 Notes and in 2020 for the 2020 Notes, if not earlier exercised. The Purchased Options are intended to offset potential economic dilution to our Class A Common Stock upon any conversion of the Notes. The Purchased Options are separate transactions and are not part of the terms of the Notes.

We paid an aggregate amount of $143.7 million for the Purchased Options, which is included in additional paid-in capital in the condensed consolidated balance sheets.

Warrants

In connection with the issuance of the Notes, we also entered into warrant transactions to sell warrants (the Warrants) to acquire, subject to anti-dilution adjustments, up to approximately 7.3 million shares of our Class A Common Stock at an exercise price of $107.96 per share. If the market value per share of our Class A Common Stock exceeds the applicable exercise price of the Warrants, the Warrants will have a dilutive effect on our earnings per share in periods that we are profitable. The Warrants are separate transactions, and are not part of the terms of the Notes or the Purchased Options. Warrants to acquire 4.2 million shares expire in July 2018 and warrants to acquire 3.1 million shares expire in July 2020.

We received aggregate proceeds of $92.7 million from the sale of the Warrants, which is recorded in additional paid-in capital in the condensed consolidated balance sheets.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Note 7. Commitments and Contingencies
	Leases
	We lease office space under noncancelable operating leases in the U.S. and overseas with various expiration dates. Certain of our office leases are with an affiliate of our co-CEO, David Duffield, who is also a director and significant stockholder of Workday. In addition, we lease certain equipment and related software from an affiliate of Mr. Duffield (see Note 12) and from various third parties. The equipment lease terms contain a bargain purchase option, therefore, the leases are classified as capital leases.
	The facility lease agreements generally provide for rental payments on a graduated basis and for options to renew, which could increase future minimum lease payments if exercised. We recognize rent expense on a straight-line basis over the period in which we benefit from the lease and have accrued for rent expense incurred but not paid. Rent expense totaled $3.6 million and $1.7 million for the three months ended October 31, 2013 and 2012, respectively, and $7.4 million and $4.4 million for the nine months ended October 31, 2013 and 2012, respectively.
	Legal Matters
	We are a party to various legal proceedings and claims which arise in the ordinary course of business. In our opinion, there was not at least a reasonable possibility that we had incurred a material loss, or a material loss in excess of a recorded accrual, with respect to such loss contingencies.

Common_Stock_and_Stockholders_

Common Stock and Stockholders' Equity	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Common Stock and Stockholders' Equity	'
	Note 8. Common Stock and Stockholders’ Equity
	Common Stock
	As of October 31, 2013, there were 78.3 million shares of Class A common stock and 96.5 million shares of Class B common stock outstanding. As of January 31, 2013, there were 26.2 million shares of Class A common stock and 140.2 million shares of Class B common stock outstanding. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock can be converted into a share of Class A common stock at any time at the option of the holder.
	Employee Equity Plans
	Our board of directors adopted the 2012 Employee Stock Purchase Plan (ESPP) in August 2012, and the ESPP became effective on October 10, 2012. The ESPP was approved with a reserve of 2.0 million shares of Class A common stock for future issuance under various terms provided for in the ESPP. We commenced our first purchase period under the ESPP on June 1, 2013. During the three months and nine months ended October 31, 2013, we recognized $1.4 million and $2.3 million of expense, respectively, related to the ESPP.
	Our board of directors adopted the 2012 Equity Incentive Plan (EIP) in August 2012, and the EIP became effective on October 10, 2012. The EIP serves as the successor to our 2005 Stock Plan, and was approved with a reserve of 25.0 million shares of Class A common stock for future issuance under various terms provided in the EIP. Additionally, shares not issued or subject to outstanding grants under the 2005 Stock Plan were rolled into the EIP resulting in a total of 39.2 million available shares under the EIP upon adoption. Pursuant to the terms of the EIP, the share reserve increased by 8.3 million shares on March 31, 2013. Shares issued under the 2005 Stock Plan were Class B common stock and shares issued under the EIP are Class A common stock. As of October 31, 2013, we had approximately 43.8 million shares of Class A common stock available for future grants under the EIP.
	Common Stock Subject to Repurchase
	The equity plans allow for the early exercise of stock options for certain individuals as determined by the board of directors. We have the right to purchase at the original exercise price any unvested (but issued) common shares during the repurchase period following termination of services of an employee. The consideration received for an exercise of an option is considered to be a deposit of the exercise price and the related dollar amount is recorded as a liability. The shares and liabilities are reclassified into equity as the awards vest. As of October 31, 2013 and January 31, 2013, we had $7.4 million and $9.4 million respectively, recorded in liabilities related to early exercises of stock options.
	Stock Options
	A summary of information related to options activity during the nine months ended October 31, 2013 is as follows:
		Outstanding			Weighted-Average		Aggregate
		Stock			Exercise Price		Intrinsic Value
		Options
	Balance as of January 31, 2013		29,856,042		$	3.19	$	1,499,463,289
	Stock options granted		74,050			60.78
	Stock options exercised		(7,233,979	)		1.29
	Stock options canceled		(433,449	)		9.32
	Balance as of October 31, 2013		22,262,664		$	3.89	$	1,580,207,640
	As of October 31, 2013, 14.6 million of the outstanding stock options were exercisable.
	Restricted Stock Units
	A summary of information related to restricted stock units activity during the nine months ended October 31, 2013 is as follows:
		Number of shares			Weighted-Average
					Grant Date Fair Value
	Balance as of January 31, 2013		163,400		$	48.82
	Restricted stock units granted		3,644,424			70.76
	Restricted stock units vested		(4,800	)		80.18
	Restricted stock units forfeited		(32,141	)		61.89
	Balance as of October 31, 2013		3,770,883		$	69.87
	As of October 31, 2013, there was a total of $250.4 million in unrecognized compensation cost related to unvested restricted stock units, which is expected to be recognized over a weighted-average period of approximately 3.7 years.
	Restricted Stock Awards
	During the three and nine months ended October 31, 2013, 30,300 and 60,300 shares of restricted stock awards vested.

Other_Expense_net

Other Expense, net	9 Months Ended
	Oct. 31, 2013
Other Income And Expenses [Abstract]	'
Other Expense, net	'
	Note 9. Other Expense, net
	Other expense, net consisted of the following (in thousands):
			Three Months Ended						Nine Months Ended
			October 31,						October 31,
			2013			2012			2013			2012
	Interest income		$	576		$	107		$	1,377		$	234
	Interest expense(1)			(7,663	)		(431	)		(11,964	)		(994	)
	Other income (expense)			194			(40	)		(41	)		(276	)
	Other expense, net		$	(6,893	)	$	(364	)	$	(10,628	)	$	(1,036	))
	(1)	During the three and nine months ended October 31, 2013, interest expense includes the contractual interest expense related to the 2018 Notes and 2020 Notes, non-cash interest related to amortization of the debt discount and amortization of debt issuance costs (See Note 6).

Income_Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 10. Income Taxes
	The effective tax rate for the three and nine months ended October 31, 2013 was less than one percent, primarily as a result of the estimated tax loss for the fiscal year. Our tax expense relates to state minimum taxes and foreign income taxes associated with our non-U.S. operations.
	There were no material changes to the unrecognized tax benefits in the three and nine months ended October 31, 2013. We intend to review the measurement of the uncertain tax positions attributable to prior years as a result of additional analysis that will be performed once the information necessary to perform the analysis is available. As a result of the additional analysis, it is reasonably possible that the total amount of unrecognized tax benefits related to prior years could be reduced significantly in the next 12 months. An estimate of the range of the reduction cannot be made as the information necessary to complete the analysis is not available. Due to a valuation allowance, any reduction in the uncertain tax positions will not impact the effective tax rate. Due to our history of tax losses, all years remain open to tax audit. We are under examination by the Internal Revenue Service (IRS) for our 2011 tax year.

Net_Loss_Per_Share

Net Loss Per Share	9 Months Ended
	Oct. 31, 2013
Earnings Per Share [Abstract]	'
Net Loss Per Share	'
	Note 11. Net Loss Per Share
	Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including our redeemable convertible preferred stock and convertible preferred stock that were both outstanding prior to our IPO, our outstanding stock options, outstanding warrants, common stock related to unvested early exercised stock options, common stock related to unvested restricted stock awards and convertible senior notes to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential common shares outstanding would have been anti-dilutive.
	The net loss per share attributable to common stockholders is allocated based on the contractual participation rights of the Class A common shares and Class B common shares as if the loss for the year has been distributed. As the liquidation and dividend rights are identical, the net loss attributable to common stockholders is allocated on a proportionate basis.
	We consider shares issued upon the early exercise of options subject to repurchase and unvested restricted stock awards to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares. In future periods, to the extent we are profitable, we will subtract earnings allocated to these participating securities from net income to determine net income attributable to common stockholders.
	The following table presents the calculation of basic and diluted net loss attributable to common stockholders per share (in thousands, except per share data):
			Three Months Ended October 31,												Nine Months Ended October 31,
			2013						2012						2013						2012
			Class A			Class B			Class A			Class B			Class A			Class B			Class A			Class B
	Net loss per share attributable to common stockholders, basic and diluted:
	Numerator:
	Allocation of distributed net loss attributable to common stockholders		$	(19,998	)	$	(27,536	)	$	(3,807	)	$	(37,664	)	$	(39,899	)	$	(76,628	)	$	(3,939	)	$	(84,875	)
	Denominator:
	Weighted-average common shares outstanding			73,365			101,020			5,688			56,272			58,642			112,627			1,910			41,143
	Basic and diluted net loss per share		$	(0.27	)	$	(0.27	)	$	(0.67	)	$	(0.67	)	$	(0.68	)	$	(0.68	)	$	(2.06	)	$	(2.06	)
	The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows (in thousands):
			As of October 31,
			2013			2012
	Shares subject to outstanding common stock options and warrants(1)			22,263			31,137
	Shares subject to repurchase			1,936			4,338
	Shares subject to unvested restricted stock awards			5,055			1,340
	Convertible senior notes			7,261			—
	Warrants related to the issuance of convertible senior notes			7,261			—
	Total			43,776			36,815
	(1)	Warrants to purchase 1.4 million shares were outstanding as of October 31, 2012 and were exercised during the three months ended April 30, 2013.

RelatedParty_Transactions

Related-Party Transactions	9 Months Ended
	Oct. 31, 2013
Related Party Transactions [Abstract]	'
Related-Party Transactions	'
	Note 12. Related-Party Transactions
	In June 2010, we entered into a capital lease agreement with an affiliate of Mr. Duffield. The lease agreement provides for an equipment lease financing facility to be drawn upon for purchases of certain equipment for use in our business operations. The amounts paid under this agreement in the three months ended October 31, 2013 and 2012 were $0.4 million and $1.0 million, respectively, and in the nine months ended October 31, 2013 and 2012 were $1.9 million and $3.2 million, respectively. As of October 31, 2013, the principal balance due under the lease agreement was $0.3 million and was included in capital leases on the condensed consolidated balance sheets.
	We currently lease certain office space in Pleasanton, California under various lease agreements with an affiliate of Mr. Duffield. The term of the agreements is 10 years and the total rent due under the agreements is $1.3 million for the year ended January 31, 2014, and $20.6 million in total. Rent expense under these agreements for the three and nine months ended October 31, 2013 was $0.4 million and $0.9 million, respectively.

Geographic_Information

Geographic Information	9 Months Ended
	Oct. 31, 2013
Segment Reporting [Abstract]	'
Geographic Information	'
	Note 13. Geographic Information
	Revenue by geography is generally based on the address of the customer as defined in our master subscription agreement. The following tables set forth revenue by geographic area (in thousands):
		Three Months Ended				Nine Months Ended
		October 31,				October 31,
		2013		2012		2013		2012
	United States	$	107,802	$	60,500	$	275,836	$	158,272
	International		20,070		12,118		51,236		33,866
	Total	$	127,872	$	72,618	$	327,072	$	192,138
	No single country other than the United States had revenues greater than 10% of total revenues for the three or nine months ended October 31, 2013 or 2012. We had no customers that individually accounted for more than 10% of our accounts receivable, net as of October 31, 2013 or as of January 31, 2013.

Overview_and_Basis_of_Presenta1

Overview and Basis of Presentation (Policies)	9 Months Ended
	Oct. 31, 2013
Accounting Policies [Abstract]	'
Company and Background	'
	Company and Background
	Workday provides enterprise cloud applications for human capital management (HCM), payroll, financial management, grants management, time tracking, procurement, employee expense management and analytics. We offer innovative and adaptable technology focused on the consumer Internet experience and cloud delivery model. Our applications are designed for global enterprises to manage complex and dynamic operating environments. We provide our customers highly adaptable, accessible and reliable applications to manage critical business functions that enable them to optimize their financial and human capital resources. We are incorporated in Delaware.
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. The condensed consolidated financial statements include the results of Workday, Inc. and its wholly-owned subsidiaries. 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. In the opinion of our management, the information contained herein reflects all adjustments necessary for a fair presentation of Workday’s results of operations, financial position and cash flows. All such adjustments are of a normal, recurring nature. The results of operations for the three and nine months ended October 31, 2013 shown in this report are not necessarily indicative of results to be expected for the full year ending January 31, 2014. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements in our Annual Report on Form 10-K for the year ended January 31, 2013, filed on March 22, 2013. There have been no changes to our significant accounting policies described in the annual report that have had a material impact on our condensed consolidated financial statements and related notes.
Use of Estimates	'
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with GAAP requires us to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. These estimates include, but are not limited to, the determination of the relative selling prices for our services, the recoverability of deferred costs and certain assumptions used in the valuation of equity awards. Actual results could differ from those estimates and such differences could be material to our consolidated financial position and results of operations.
Segment Information	'
	Segment Information
	We operate in one operating segment, cloud applications. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assessing performance. Our chief operating decision maker allocates resources and assesses performance based upon discrete financial information at the consolidated level. Since we operate in one operating segment, all required financial segment information can be found in the condensed consolidated financial statements.

Marketable_Securities_Tables

Marketable Securities (Tables)	9 Months Ended
	Oct. 31, 2013
Cash And Cash Equivalents [Abstract]	'
Summary of Marketable Securities	'
	At October 31, 2013, marketable securities consisted of the following (in thousands):
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. agency obligations	$	956,043	$	198	$	(46	)	$	956,195
	U.S. treasury securities		163,548		74		(2	)		163,620
	Commercial paper		63,786		—		—			63,786
	U.S. corporate securities		11,825		4		—			11,829
	Money market funds		41,115		—		—			41,115
		$	1,236,317	$	276	$	(48	)	$	1,236,545
	Included in cash and cash equivalents	$	137,310	$	—	$	—		$	137,310
	Included in marketable securities	$	1,099,007	$	276	$	(48	)	$	1,099,235
	At January 31, 2013, marketable securities consisted of the following (in thousands):
		Amortized		Unrealized		Unrealized			Aggregate
		Cost		Gains		Losses			Fair Value
	U.S. agency obligations	$	614,171	$	64	$	(11	)	$	614,224
	U.S. treasury securities		65,174		5		—			65,179
	Commercial paper		64,538		1		—			64,539
	Certificates of deposit		250		—		—			250
	U.S. corporate securities		8,128		—		(1	)		8,127
	Money market funds		17,395		—		—			17,395
		$	769,656	$	70	$	(12	)	$	769,714
	Included in cash and cash equivalents	$	63,533	$	—	$	—		$	63,533
	Included in marketable securities	$	706,123	$	70	$	(12	)	$	706,181

Deferred_Costs_Tables

Deferred Costs (Tables)	9 Months Ended
	Oct. 31, 2013
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'
Summary of Deferred Costs	'
	Deferred costs consisted of the following (in thousands):
		October 31,		January 31,
		2013		2013
	Current:
	Deferred professional service costs	$	3,500	$	1,654
	Deferred sales commissions		10,852		8,162
	Total	$	14,352	$	9,816
	Noncurrent:
	Deferred professional service costs	$	5,106	$	6,843
	Deferred sales commissions		12,933		11,732
	Total	$	18,039	$	18,575

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	9 Months Ended
	Oct. 31, 2013
Property Plant And Equipment [Abstract]	'
Summary of Property and Equipment	'
	Property and equipment consisted of the following (in thousands):
		October 31,			January 31,
		2013			2013
	Computers, equipment and software	$	65,996		$	28,770
	Computers, equipment and software acquired under capital leases		39,415			39,300
	Furniture and fixtures		6,609			4,689
	Leasehold improvements		17,176			6,581
			129,196			79,340
	Less accumulated depreciation and amortization		(55,236	)		(34,755	)
	Property and equipment, net	$	73,960		$	44,585

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Oct. 31, 2013
Fair Value Disclosures [Abstract]	'
Information about Assets that are Measured at Fair Value on a Recurring Basis	'
	The following tables present information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
		Fair Value Measurements as of
		31-Oct-13
	Description	Level 1		Level 2		Total
	U.S. agency obligations	$	—	$	956,195	$	956,195
	U.S. treasury securities		163,620		—		163,620
	Commercial paper		—		63,786		63,786
	U.S. corporate securities		—		11,829		11,829
	Money market funds		41,115		—		41,115
		$	204,735	$	1,031,810	$	1,236,545
	Included in cash and cash equivalents					$	137,310
	Included in marketable securities					$	1,099,235
		Fair Value Measurements as of
		January 31, 2013
	Description	Level 1		Level 2		Total
	U.S. agency obligations	$	—	$	614,224	$	614,224
	U.S. treasury securities		65,179		—		65,179
	Commercial paper		—		64,539		64,539
	Certificates of deposit		—		250		250
	U.S. corporate securities		—		8,127		8,127
	Money market funds		17,395		—		17,395
		$	82,574	$	687,140	$	769,714
	Included in cash and cash equivalents					$	63,533
	Included in marketable securities					$	706,181
Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments	'
	The carrying amounts and estimated fair values of financial instruments not recorded at fair value are as follows (in thousands):
		October 31, 2013
		Carrying		Estimated
		Amount		Fair Value
	0.75% Convertible Senior Notes	$	278,004	$	395,500
	1.50% Convertible Senior Notes		185,088		290,313

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	9 Months Ended
	Oct. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Senior Notes	'
	The Notes consisted of the following (in thousands):
			As of October 31,
			2013
			2018 Notes			2020 Notes
	Principal amounts:
	Principal		$	350,000		$	250,000
	Unamortized debt discount(1)			(71,996	)		(64,912	)
	Net carrying amount		$	278,004		$	185,088
	Carrying amount of the equity component(2)		$	74,892		$	66,007
	(1)	Included in the condensed consolidated balance sheets within Convertible senior notes, net and amortized over the remaining lives of the Notes on the straight-line basis as it approximates the effective interest rate method.
	(2)	Included in the condensed consolidated balance sheets within Additional paid-in capital, net of $2.0 million and $1.8 million for the 2018 Notes and 2020 Notes, respectively, in equity issuance costs.
Schedule of Interest Expense Recognized Related to Convertible Senior Notes	'
	The following table sets forth total interest expense recognized related to the 2018 Notes and 2020 Notes (in thousands, except percentages):
			Three Months ended						Nine Months ended
			October 31, 2013						October 31, 2013
			2018 Notes			2020 Notes			2018 Notes		2020 Notes
	Contractual interest expense		$	656		$	938		$	977	$	1,396
	Interest cost related to amortization of debt issuance costs			352			169			524		251
	Interest cost related to amortization of the debt discount			3,308			1,935			4,909		2,870

Common_Stock_and_Stockholders_1

Common Stock and Stockholders' Equity (Tables)	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of the Combined Activity under the 2005 Stock Plan and the EIP	'
	A summary of information related to options activity during the nine months ended October 31, 2013 is as follows:
		Outstanding			Weighted-Average		Aggregate
		Stock			Exercise Price		Intrinsic Value
		Options
	Balance as of January 31, 2013		29,856,042		$	3.19	$	1,499,463,289
	Stock options granted		74,050			60.78
	Stock options exercised		(7,233,979	)		1.29
	Stock options canceled		(433,449	)		9.32
	Balance as of October 31, 2013		22,262,664		$	3.89	$	1,580,207,640
Summary of Information Related to Restricted Stock Units Activity	'
	A summary of information related to restricted stock units activity during the nine months ended October 31, 2013 is as follows:
		Number of shares			Weighted-Average
					Grant Date Fair Value
	Balance as of January 31, 2013		163,400		$	48.82
	Restricted stock units granted		3,644,424			70.76
	Restricted stock units vested		(4,800	)		80.18
	Restricted stock units forfeited		(32,141	)		61.89
	Balance as of October 31, 2013		3,770,883		$	69.87

Other_Expense_net_Tables

Other Expense, net (Tables)	9 Months Ended
	Oct. 31, 2013
Other Income And Expenses [Abstract]	'
Other Expense, Net	'
	Other expense, net consisted of the following (in thousands):
			Three Months Ended						Nine Months Ended
			October 31,						October 31,
			2013			2012			2013			2012
	Interest income		$	576		$	107		$	1,377		$	234
	Interest expense(1)			(7,663	)		(431	)		(11,964	)		(994	)
	Other income (expense)			194			(40	)		(41	)		(276	)
	Other expense, net		$	(6,893	)	$	(364	)	$	(10,628	)	$	(1,036	))
	(1)	During the three and nine months ended October 31, 2013, interest expense includes the contractual interest expense related to the 2018 Notes and 2020 Notes, non-cash interest related to amortization of the debt discount and amortization of debt issuance costs (See Note 6).

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	9 Months Ended
	Oct. 31, 2013
Earnings Per Share [Abstract]	'
Summary of Calculation of Basic and Diluted Net Income Per Share	'
	The following table presents the calculation of basic and diluted net loss attributable to common stockholders per share (in thousands, except per share data):
			Three Months Ended October 31,												Nine Months Ended October 31,
			2013						2012						2013						2012
			Class A			Class B			Class A			Class B			Class A			Class B			Class A			Class B
	Net loss per share attributable to common stockholders, basic and diluted:
	Numerator:
	Allocation of distributed net loss attributable to common stockholders		$	(19,998	)	$	(27,536	)	$	(3,807	)	$	(37,664	)	$	(39,899	)	$	(76,628	)	$	(3,939	)	$	(84,875	)
	Denominator:
	Weighted-average common shares outstanding			73,365			101,020			5,688			56,272			58,642			112,627			1,910			41,143
	Basic and diluted net loss per share		$	(0.27	)	$	(0.27	)	$	(0.67	)	$	(0.67	)	$	(0.68	)	$	(0.68	)	$	(2.06	)	$	(2.06	)
Summary of Diluted Net Loss Per Common Share	'
	The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows (in thousands):
			As of October 31,
			2013			2012
	Shares subject to outstanding common stock options and warrants(1)			22,263			31,137
	Shares subject to repurchase			1,936			4,338
	Shares subject to unvested restricted stock awards			5,055			1,340
	Convertible senior notes			7,261			—
	Warrants related to the issuance of convertible senior notes			7,261			—
	Total			43,776			36,815
	(1)	Warrants to purchase 1.4 million shares were outstanding as of October 31, 2012 and were exercised during the three months ended April 30, 2013.

Geographic_Information_Tables

Geographic Information (Tables)	9 Months Ended
	Oct. 31, 2013
Segment Reporting [Abstract]	'
Summary of Revenues by Geographic Area	'
	The following tables set forth revenue by geographic area (in thousands):
		Three Months Ended				Nine Months Ended
		October 31,				October 31,
		2013		2012		2013		2012
	United States	$	107,802	$	60,500	$	275,836	$	158,272
	International		20,070		12,118		51,236		33,866
	Total	$	127,872	$	72,618	$	327,072	$	192,138

Overview_and_Basis_of_Presenta2

Overview and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Oct. 31, 2013
	Segment
Accounting Policies [Abstract]	'
Number of operating segments	1

Marketable_Securities_Summary_

Marketable Securities - Summary of Marketable Securities (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$1,236,317	$769,656
Unrealized Gains	276	70
Unrealized Losses	-48	-12
Aggregate Fair Value	1,236,545	769,714
U.S. agency obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	956,043	614,171
Unrealized Gains	198	64
Unrealized Losses	-46	-11
Aggregate Fair Value	956,195	614,224
U.S. treasury securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	163,548	65,174
Unrealized Gains	74	5
Unrealized Losses	-2	'
Aggregate Fair Value	163,620	65,179
Commercial paper [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	63,786	64,538
Unrealized Gains	'	1
Unrealized Losses	'	'
Aggregate Fair Value	63,786	64,539
Certificates of deposit [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	'	250
Unrealized Gains	'	'
Unrealized Losses	'	'
Aggregate Fair Value	'	250
U.S. corporate securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	11,825	8,128
Unrealized Gains	4	'
Unrealized Losses	'	-1
Aggregate Fair Value	11,829	8,127
Money market funds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	41,115	17,395
Unrealized Gains	'	'
Unrealized Losses	'	'
Aggregate Fair Value	41,115	17,395
Included in cash and cash equivalents [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	137,310	63,533
Unrealized Gains	'	'
Unrealized Losses	'	'
Aggregate Fair Value	137,310	63,533
Included in marketable securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	1,099,007	706,123
Unrealized Gains	276	70
Unrealized Losses	-48	-12
Aggregate Fair Value	$1,099,235	$706,181

Marketable_Securities_Addition

Marketable Securities - Additional Information (Detail) (Included in marketable securities [Member], USD $)	Oct. 31, 2013
Included in marketable securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Marketable securities continuous unrealized loss position for more than 12 months	$0

Deferred_Costs_Summary_of_Defe

Deferred Costs - Summary of Deferred Costs (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Current:	'	'
Deferred professional service costs	$3,500	$1,654
Deferred sales commissions	10,852	8,162
Total	14,352	9,816	[1]
Noncurrent:	'	'
Deferred professional service costs	5,106	6,843
Deferred sales commissions	12,933	11,732
Total	$18,039	$18,575	[1]
[1]	Amounts as of January 31, 2013 were derived from the January 31, 2013 audited financial statements.

Property_and_Equipment_Net_Sum

Property and Equipment, Net - Summary of Property and Equipment (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment [Abstract]	'	'
Computers, equipment and software	$65,996	$28,770
Computers, equipment and software acquired under capital leases	39,415	39,300
Furniture and fixtures	6,609	4,689
Leasehold improvements	17,176	6,581
Property and equipment, gross	129,196	79,340
Less accumulated depreciation and amortization	-55,236	-34,755
Property and equipment, net	$73,960	$44,585	[1]
[1]	Amounts as of January 31, 2013 were derived from the January 31, 2013 audited financial statements.

Property_and_Equipment_Net_Add

Property and Equipment, Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Property Plant And Equipment [Abstract]	'	'	'	'
Depreciation expense	$7.90	$4.10	$20.50	$10.80
Depreciation on asset recorded under capital lease	$3	$2.80	$9.40	$6.80

Fair_Value_Measurements_Inform

Fair Value Measurements - Information about Assets that are Measured at Fair Value on a Recurring Basis (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	$1,236,545	$769,714
U.S. agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	956,195	614,224
U.S. treasury securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	163,620	65,179
Commercial paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	63,786	64,539
Certificates of deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	250
U.S. corporate securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	11,829	8,127
Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	41,115	17,395
Included in cash and cash equivalents [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	137,310	63,533
Included in marketable securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	1,099,235	706,181
Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	204,735	82,574
Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	'
Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. treasury securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	163,620	65,179
Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	'
Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	'
Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. corporate securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	'
Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	41,115	17,395
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	1,031,810	687,140
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	956,195	614,224
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. treasury securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	'
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	63,786	64,539
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	250
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. corporate securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	11,829	8,127
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money market funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets Fair Value Disclosure	'	'

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) (USD $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'
Convertible Senior Notes, Carrying Amount	$463,092
2018 Notes [Member]	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'
Convertible Senior Notes, Carrying Amount	278,004
Convertible Senior Notes, Estimated Fair Value	395,500
2020 Notes [Member]	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'
Convertible Senior Notes, Carrying Amount	185,088
Convertible Senior Notes, Estimated Fair Value	$290,313

Fair_Value_Measurements_Schedu1

Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Parenthetical) (Detail)	Oct. 31, 2013	Jun. 30, 2013
2018 Notes [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Contractual interest rate	0.75%	0.75%
2020 Notes [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Contractual interest rate	1.50%	1.50%

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Oct. 31, 2013	Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Closing price of company's common stock	74.87	'
2018 Notes [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Contractual interest rate	0.75%	0.75%
2020 Notes [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Contractual interest rate	1.50%	1.50%

Convertible_Senior_Notes_Conve

Convertible Senior Notes - Convertible Senior Notes - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Jun. 30, 2013	Oct. 31, 2013	Oct. 31, 2013
Debt Instrument [Line Items]	'	'	'
Proceeds from sale of warrants	'	'	$92,708,000
2018 Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Convertible Senior Notes, principal amount	350,000,000	350,000,000	350,000,000
Contractual interest rate	0.75%	0.75%	0.75%
Convertible Senior Notes, maturity date	15-Jul-18	'	'
First required date for interest payment	15-Jan-14	'	'
Latest date for conversion	'	'	14-Mar-18
Liability issuance costs	'	7,200,000	'
Equity issuance costs	'	2,000,000	2,000,000
Amortization expense for debt issuance costs	'	352,000	524,000
Remaining life of the Notes	'	'	'56 months
Effective interest rates of the liability components	'	5.75%	5.75%
Two Thousand Eighteen And Two Thousand Twenty Senior Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Convertible Senior Notes, principal amount	250,000,000	'	'
2020 Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Convertible Senior Notes, principal amount	'	250,000,000	250,000,000
Contractual interest rate	1.50%	1.50%	1.50%
Convertible Senior Notes, maturity date	15-Jul-20	'	'
First required date for interest payment	15-Jan-14	'	'
Latest date for conversion	'	'	13-Mar-20
Liability issuance costs	'	4,700,000	'
Equity issuance costs	'	1,800,000	1,800,000
Amortization expense for debt issuance costs	'	169,000	251,000
Remaining life of the Notes	'	'	'80 months
Effective interest rates of the liability components	'	6.25%	6.25%
Convertible Senior Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Repurchase of notes percentage	'	'	100.00%
Shares covered by each purchased option/warrant	'	7.3	7.3
Exercise price of warrants, per share	'	$107.96	$107.96
Proceeds from sale of warrants	'	'	92,700,000
Convertible Senior Notes [Member] | Purchased Options [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Shares covered by each purchased option/warrant	'	7.3	7.3
Aggregate amount for Purchased Options	'	143,700,000	143,700,000
Convertible Senior Notes [Member] | Scenario One After the Quarter Ending October 31, 2013 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Threshold trading days	'	'	20
Threshold consecutive trading days	'	'	'30 days
Threshold percentage of conversion price	'	'	130.00%
Convertible Senior Notes [Member] | Scenario Two [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Threshold trading days	'	'	5
Threshold consecutive trading days	'	'	'5 days
Convertible Senior Notes [Member] | Scenario Two [Member] | Maximum [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Threshold percentage of conversion price	'	'	98.00%
Warrants Expires In July Two Thousand Eighteen [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Shares covered by each purchased option/warrant	'	4.2	4.2
Warrants Expires In July Two Thousand Twenty [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Shares covered by each purchased option/warrant	'	3.1	3.1
Common Class A [Member] | 2018 Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Initial conversion rate	'	'	12.0075
Principal amount converted in to Class A Common Stock	'	'	1,000
Initial conversion price	'	$83.28	$83.28
Common Class A [Member] | 2020 Notes [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Initial conversion rate	'	'	12.234
Principal amount converted in to Class A Common Stock	'	'	$1,000
Initial conversion price	'	$81.74	$81.74

Convertible_Senior_Notes_Sched

Convertible Senior Notes - Schedule of Senior Notes (Detail) (USD $)	Oct. 31, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Net carrying amount	$463,092	'
2018 Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Principal	350,000	350,000
Unamortized debt discount	-71,996	'
Net carrying amount	278,004	'
Carrying amount of the equity component	74,892	'
2020 Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Principal	250,000	'
Unamortized debt discount	-64,912	'
Net carrying amount	185,088	'
Carrying amount of the equity component	$66,007	'

Convertible_Senior_Notes_Sched1

Convertible Senior Notes - Schedule of Senior Notes (Parenthetical) (Detail) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2013
2018 Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Equity issuance costs	$2	$2
2020 Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Equity issuance costs	$1.80	$1.80

Convertible_Senior_Notes_Sched2

Convertible Senior Notes - Schedule of Interest Expense Recognized Related to Convertible Senior Notes (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2013
2018 Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Contractual interest expense	$656	$977
Interest cost related to amortization of debt issuance costs	352	524
Interest cost related to amortization of the debt discount	3,308	4,909
2020 Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Contractual interest expense	938	1,396
Interest cost related to amortization of debt issuance costs	169	251
Interest cost related to amortization of the debt discount	$1,935	$2,870

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Commitments And Contingencies Disclosure [Abstract]	'	'	'	'
Rent expense	$3.60	$1.70	$7.40	$4.40

Common_Stock_and_Stockholders_2

Common Stock and Stockholders' Equity - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

In Millions, except Share data, unless otherwise specified

Oct. 31, 2013

Oct. 31, 2013

Jan. 31, 2013

Jan. 31, 2013

Oct. 31, 2013

Mar. 31, 2013

Oct. 31, 2013

Oct. 31, 2012

Jan. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class A [Member]

Common Class B [Member]

Common Class B [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Restricted Stock Units [Member]

vote_per_share

2012 Equity Incentive Plan [Member]

2012 Equity Incentive Plan [Member]

2012 Equity Incentive Plan [Member]

vote_per_share

Common Class A [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares outstanding

'

'

'

26,200,000

78,300,000

'

'

'

140,200,000

96,500,000

'

'

'

'

Common stock, votes per share

'

'

'

1

'

'

'

'

10

'

'

'

'

'

Shares for future issuance under various terms provided for in the ESPP

'

'

'

'

'

'

25,000,000

'

'

'

'

'

2,000,000

'

Expense related to ESPP

'

'

'

'

'

'

'

'

'

'

$1.40

$2.30

'

'

Shares not issued or subject to outstanding grants under EIP Plan

'

'

'

'

'

'

'

39,200,000

'

'

'

'

'

'

Share reserve increased EIP

'

'

'

'

'

8,300,000

'

'

'

'

'

'

'

'

Common stock available for future grants

'

'

'

'

43,800,000

'

'

'

'

'

'

'

'

'

Liabilities related to early exercises of stock options

7.4

7.4

9.4

'

'

'

'

'

'

'

'

'

'

'

Number of outstanding stock options are exercisable

14,600,000

14,600,000

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost

'

'

'

'

'

'

'

'

'

'

'

'

'

$250.40

Unrecognized compensation cost, Expected weighted-average recognition period

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years 8 months 12 days

Restricted stock awards vested

30,300

60,300

'

'

'

'

'

'

'

'

'

'

'

4,800

Common_Stock_and_Stockholders_3

Common Stock and Stockholders' Equity - Summary of the Combined Activity under the 2005 Stock Plan and the EIP (Detail) (USD $)	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Beginning Balance, Outstanding Stock Options	29,856,042
Stock options granted, Outstanding Stock Options	74,050
Stock options exercised, Outstanding Stock Options	-7,233,979
Stock options canceled, Outstanding Stock Options	-433,449
Ending Balance, Outstanding Stock Options	22,262,664
Beginning Balance, Weighted-Average Exercise Price	$3.19
Stock options granted, Weighted-Average Exercise Price	$60.78
Stock options exercised, Weighted-Average Exercise Price	$1.29
Stock options canceled, Weighted-Average Exercise Price	$9.32
Ending Balance, Weighted-Average Exercise Price	$3.89
Beginning Balance, Aggregate Intrinsic Value	$1,499,463,289
Ending Balance, Aggregate Intrinsic Value	$1,580,207,640

Common_Stock_and_Stockholders_4

Common Stock and Stockholders' Equity - Summary of Information Related to Restricted Stock Units Activity (Detail) (USD $)	3 Months Ended	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Restricted stock units vested, Number of shares	-30,300	-60,300
Restricted Stock Units [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Beginning Balance, Number of Shares	'	163,400
Restricted stock units granted, Number of shares	'	3,644,424
Restricted stock units vested, Number of shares	'	-4,800
Restricted stock units forfeited, Number of shares	'	-32,141
Ending Balance, Number of shares	3,770,883	3,770,883
Beginning Balance, Weighted-Average Grant Date Fair Value	'	48.82
Restricted stock units granted, Weighted-Average Grant Date Fair Value	'	70.76
Restricted stock units vested, Weighted-Average Grant Date Fair Value	'	80.18
Restricted stock units forfeited, Weighted-Average Grant Date Fair Value	'	61.89
Ending Balance, Weighted-Average Grant Date Fair Value	69.87	69.87

Other_Expense_net_Other_Expens

Other Expense, net - Other Expense, Net (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Other Income And Expenses [Abstract]	'	'	'	'
Interest income	$576	$107	$1,377	$234
Interest expense	-7,663	-431	-11,964	-994
Other income (expense)	194	-40	-41	-276
Other expense, net	($6,893)	($364)	($10,628)	($1,036)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2013
Income Taxes [Line Items]	'	'
Unrecognized tax benefit	0	0
Maximum [Member]	'	'
Income Taxes [Line Items]	'	'
Effective tax rates	1.00%	1.00%

Net_Loss_Per_Share_Summary_of_

Net Loss Per Share - Summary of Calculation of Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Numerator:	'	'	'	'
Allocation of distributed net loss attributable to common stockholders	($47,534)	($41,471)	($116,527)	($88,814)
Denominator:	'	'	'	'
Weighted-average common shares outstanding	174,385	61,960	171,269	43,053
Basic and diluted net loss per share	($0.27)	($0.67)	($0.68)	($2.06)
Common Class A [Member]	'	'	'	'
Numerator:	'	'	'	'
Allocation of distributed net loss attributable to common stockholders	-19,998	-3,807	-39,899	-3,939
Denominator:	'	'	'	'
Weighted-average common shares outstanding	73,365	5,688	58,642	1,910
Basic and diluted net loss per share	($0.27)	($0.67)	($0.68)	($2.06)
Common Class B [Member]	'	'	'	'
Numerator:	'	'	'	'
Allocation of distributed net loss attributable to common stockholders	($27,536)	($37,664)	($76,628)	($84,875)
Denominator:	'	'	'	'
Weighted-average common shares outstanding	101,020	56,272	112,627	41,143
Basic and diluted net loss per share	($0.27)	($0.67)	($0.68)	($2.06)

Net_Loss_Per_Share_Summary_of_1

Net Loss Per Share - Summary of Diluted Net Loss Per Common Share (Detail)	9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total anti-dilutive securities	43,776	36,815
Purchased Options [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total anti-dilutive securities	22,263	31,137
Warrants [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total anti-dilutive securities	1,936	4,338
Shares subject to unvested restricted stock awards [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total anti-dilutive securities	5,055	1,340
Convertible Senior Notes [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total anti-dilutive securities	7,261	'
Warrants related to the issuance of convertible senior notes [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total anti-dilutive securities	7,261	'

Net_Loss_Per_Share_Summary_of_2

Net Loss Per Share - Summary of Diluted Net Loss Per Common Share (Parenthetical) (Detail)	Oct. 31, 2013
In Millions, unless otherwise specified
Earnings Per Share [Abstract]	'
Warrants to purchase shares exercised	1.4

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013
Related Party Transaction [Line Items]	'	'	'	'	'
Amount paid under lease agreement	$2,817,000	$2,369,000	$9,505,000	$5,912,000	'
Principal balance due under the lease agreement	5,546,000	'	5,546,000	'	12,972,000	[1]
Affiliate co-CEO, David Duffield [Member]	'	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'	'
Amount paid under lease agreement	400,000	1,000,000	1,900,000	3,200,000	'
Principal balance due under the lease agreement	300,000	'	300,000	'	'
Term of agreements	'	'	'10 years	'	'
Total rent due under agreements, 2014	1,300,000	'	1,300,000	'	'
Total rent due under agreements	20,600,000	'	20,600,000	'	'
Rent expense	$400,000	'	$900,000	'	'
[1]	Amounts as of January 31, 2013 were derived from the January 31, 2013 audited financial statements.

Geographic_Information_Summary

Geographic Information - Summary of Revenues by Geographic Area (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Revenue from External Customer [Line Items]	'	'	'	'
Revenue	$127,872	$72,618	$327,072	$192,138
United States [Member]	'	'	'	'
Revenue from External Customer [Line Items]	'	'	'	'
Revenue	107,802	60,500	275,836	158,272
International [Member]	'	'	'	'
Revenue from External Customer [Line Items]	'	'	'	'
Revenue	$20,070	$12,118	$51,236	$33,866

Geographic_Information_Additio

Geographic Information - Additional Information (Detail)	9 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2013	Jan. 31, 2013	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
	Customer		Revenue [Member]	Revenue [Member]	Revenue [Member]	Revenue [Member]
			Customer Concentration Risk [Member]	Customer Concentration Risk [Member]	Customer Concentration Risk [Member]	Customer Concentration Risk [Member]
			United States [Member]	United States [Member]	United States [Member]	United States [Member]
			Minimum [Member]	Minimum [Member]	Minimum [Member]	Minimum [Member]
Revenue from External Customer [Line Items]	'	'	'	'	'	'
Entity wide revenue major customer percentage threshold	'	'	10.00%	10.00%	10.00%	10.00%
Number of customers accounted for more than 10 percent of accounts receivable	0	'	'	'	'	'
Entity wide accounts receivable major customer percentage	10.00%	10.00%	'	'	'	'