Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2020 USD ($) $ / shares	Oct. 31, 2020 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock options granted	$ 230	$ 230
Intrinsic value of options exercised	$ 81	$ 266
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	$ 105.38	$ 70.44
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of unvested stock (in years)		3 years 4 months 24 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 4 months 24 days
Unrecognized compensation cost related to unvested RSUs	$ 137	$ 137
Total intrinsic value, vested	$ 68	$ 167

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

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