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Stockholders' Equity (Tables)
 9 Months Ended
Oct. 31, 2021
Equity [Abstract]  
Summary of Information Related to Restricted Stock Units Activity A summary of information related to RSU activity during the nine months ended October 31, 2021, is as follows (in thousands, except per share data): 
Number of Shares Weighted-Average Grant Date Fair Value
Balance as of January 31, 202113,168 $154.90 
RSUs granted5,651 257.78 
RSUs vested(5,103)147.99 
RSUs forfeited(1,101)181.72 
Balance as of October 31, 202112,615 201.44 
Summary of Information Related to Stock Option Activity A summary of information related to stock option activity during the nine months ended October 31, 2021, is as follows (in millions, except number of shares which are reflected in thousands and per share data):
Outstanding Stock OptionsWeighted-Average Exercise PriceAggregate Intrinsic Value
Balance as of January 31, 20211,260 $13.55 $270 
Stock options exercised(671)9.01 
Stock options canceled(13)35.55 
Balance as of October 31, 2021576 18.34 156 
Vested and expected to vest as of October 31, 2021575 18.33 156 
Exercisable as of October 31, 2021545 17.23 149