Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Apr. 30, 2017	Jan. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Options granted	6,500
Unrecognized compensation cost related to unvested stock options granted	$ 36.6
Intrinsic value of options exercised	$ 48.1
Class B common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares unvested	0	2,500
Accounting Standards Update 2016-09 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative-effect adjustment on retained earnings		$ 0.7
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period of unvested stock	3 years 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period of unvested stock	2 years 10 months 25 days
Weighted average grant date fair value, RSUs granted	$ 48.02
Number of shares, RSUs granted	578,285
Unrecognized compensation cost related to unvested RSUs	$ 108.6
2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average grant date fair value of options granted	$ 22.68
Number of shares, Options granted	6,500
2013 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value, RSUs granted	$ 48.02
Number of shares, RSUs granted	578,285
2012 and 2013 Equity Incentive Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation cost recognition vesting service period	4 years
2012 and 2013 Equity Incentive Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation cost recognition vesting service period	9 years

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of grants made 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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of non-vested options outstanding.

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