Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
Apr. 30, 2021 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock options granted	$ 300.1
Intrinsic value of options exercised	$ 114.6
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of options granted (in usd per share) \| $ / shares	$ 108.50
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of unvested stock (in years)	3 years 2 months 12 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of unvested stock (in years)	2 years 1 month 6 days
Unrecognized compensation cost related to unvested RSUs	$ 185.2
Total intrinsic value, vested	$ 71.5

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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