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Stock-Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plans and Related Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Outstanding Options, Beginning balance	17,465,571	18,427,075
Shares Subject to Outstanding Options, Options granted	1,898,700	2,918,632
Shares Subject to Outstanding Options, Options exercised	(2,196,516)	(2,306,816)
Shares Subject to Outstanding Options, Options forfeited/cancelled	(1,533,237)	(1,573,320)
Shares Subject to Outstanding Options, Ending balance	15,634,518	17,465,571	18,427,075
Shares Subject to Outstanding Options, Vested and expected to vest	15,398,572
Shares Subject to Outstanding Options, Exercisable	9,587,096
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning Balance	$ 5.67	$ 3.65
Weighted Average Exercise Price, Options granted	15.62	15.73
Weighted Average Exercise Price, Options exercised	3.26	2.61
Weighted Average Exercise Price, Options forfeited/cancelled	8.67	5.22
Weighted Average Exercise Price, Ending Balance	6.92	$ 5.67	$ 3.65
Weighted Average Exercise Price, Vested and expected to vest	6.84
Weighted Average Exercise Price, Exercisable	$ 4.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Life (Years)	7 years 1 month 13 days	7 years 9 months 18 days	8 years 5 months 12 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	7 years 1 month 6 days
Weighted Average Remaining Contractual Life (Years), Exercisable	6 years 5 months 1 day
Aggregate Intrinsic Value, Balance	$ 82,541	$ 229,713	$ 191,809
Aggregate Intrinsic Value, Vested and expected to vest	82,076
Aggregate Intrinsic Value, Exercisable	$ 68,926

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently 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 option awards outstanding, 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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