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Stockholders' Equity (Tables)
 6 Months Ended
Jul. 31, 2021
Equity [Abstract]  
Summary of Information Related to Restricted Stock Units Activity A summary of information related to RSU activity during the six months ended July 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 granted4,952 257.51 
RSUs vested(3,924)145.53 
RSUs forfeited(779)177.04 
Balance as of July 31, 202113,417 194.22 
Summary of Information Related to Stock Option Activity A summary of information related to stock option activity during the six months ended July 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(435)9.23 
Stock options canceled(13)35.44 
Balance as of July 31, 2021812 15.54 178 
Vested and expected to vest as of July 31, 2021809 15.45 177 
Exercisable as of July 31, 2021768 14.25 169