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- Definition

Restricted stock units, vesting period

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Exercise Price.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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-Publisher FASB

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- Definition

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-SubTopic 10

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-Paragraph 2

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Publisher FASB

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Topic 505

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	19 Months Ended	89 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2006	Jan. 31, 2015	Jul. 03, 2013	Jul. 10, 2014	Jul. 09, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	30,789,538	55,852,536			30,789,538
ESPP purchase amount (in shares)	3,300,000	2,900,000
ESPP purchase amount	$ 127,800,000	$ 92,500,000
Total intrinsic value of the options exercised during the period	250,300,000	292,300,000	506,900,000
Weighted-average remaining contractual life of vested and expected to vest options (in years)	4 years 3 months 23 days
Options vested	11,253,182				11,253,182
Weighted average exercise price vested	$ 34.37				34.37
Weighted-average contractual life of vested and expected to vest options (in years)	2 years 6 months 1 day
Aggregate intrinsic value	248,524,393,000				248,524,393,000
Weighted-average exercise price	$ 0.001				0.001
Restricted stock units, vesting period (in years)	4 years
Weighted-average grant date fair value of the restricted stock units issued	$ 58.89	$ 46.99	$ 37.71
Preferred stock, shares authorized (in shares)	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized			5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, outstanding (in shares)	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding			0us-gaap_PreferredStockSharesOutstanding
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life of stock options (in years)				10 years	7 years	5 years
2014 Inducement Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)							335,000
Shares available for grant (in shares)	587,399				587,399
2006 Inducement Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)								319,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	2,849,542				2,849,542
Amount withheld on behalf of employees for future purchases	28,700,000				28,700,000
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	30,202,139				30,202,139
Shares of common stock received under the plan (in shares)	83,127	108,800	102,400
Expense related to awards at the time of issuance	$ 5,000,000	$ 4,500,000	$ 3,800,000