Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
Apr. 30, 2022 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock options granted	$ 463
Intrinsic value of options exercised	$ 83
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	$ 88.82
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of unvested stock (in years)	3 years 1 month 6 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 3 months 18 days
Unrecognized compensation cost related to unvested RSUs	$ 334
Total intrinsic value, vested	$ 41

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

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