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

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 01, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Options granted				13,000
Unrecognized compensation cost related to unvested stock options granted		$ 32.8		$ 32.8
Intrinsic value of options exercised		$ 40.7		$ 88.8
Class B common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares unvested		0		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 1 month 6 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 8 months 12 days
Weighted average grant date fair value, RSUs granted				$ 51.96
Number of shares, RSUs granted				876,244
Unrecognized compensation cost related to unvested RSUs		$ 112.0		$ 112.0
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		$ 29.11		$ 25.89	$ 11.99
Number of shares, Options granted		6,500	0	13,000
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		$ 59.55		$ 51.96
Number of shares, RSUs granted		297,959		876,244
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