Stock-Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plans and Related Information (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Oct. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Options Outstanding, Beginning balance \| shares	9,096,961
Shares Subject to Options Outstanding, Options granted \| shares	577,082
Shares Subject to Options Outstanding, Options exercised \| shares	(417,245)
Shares Subject to Options Outstanding, Options forfeited/cancelled \| shares	(60,972)
Shares Subject to Options Outstanding, Ending balance \| shares	9,195,826	9,096,961
Shares Subject to Options Outstanding, Vested and expected to vest \| shares	9,119,519
Shares Subject to Options Outstanding, Exercisable \| shares	7,579,160
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price, Beginning Balance \| $ / shares	$ 9.01
Weighted-Average Exercise Price, Options granted \| $ / shares	19.89
Weighted-Average Exercise Price, Options exercised \| $ / shares	7.21
Weighted-Average Exercise Price, Options forfeited/cancelled \| $ / shares	18.00
Weighted-Average Exercise Price, Ending Balance \| $ / shares	9.71	$ 9.01
Weighted-Average Exercise Price, Vested and expected to vest \| $ / shares	9.63
Weighted-Average Exercise Price, Exercisable \| $ / shares	$ 7.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Life (Years)	4 years 6 months 18 days	4 years 11 months 19 days
Weighted-Average Remaining Contractual Life (Years), Vested and expected to vest	4 years 6 months 3 days
Weighted-Average Remaining Contractual Life (Years), Exercisable	3 years 8 months 4 days
Aggregate Intrinsic Value, Balance \| $	$ 72,392	$ 108,731
Aggregate Intrinsic Value, Vested and expected to vest \| $	72,389
Aggregate Intrinsic Value, Exercisable \| $	$ 72,342

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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