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Stockholders' Equity (Tables)
 12 Months Ended
Jan. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity A summary of stock option activity for the fiscal year ended January 31, 2021 is as follows: 
Number
of shares
Weighted
average
exercise
price
Weighted
average
remaining
contractual
term (in years)
Aggregate
intrinsic
value
(in millions)
Options outstanding at January 31, 202013,448,026 $40.64 5.4$1,427 
Options granted1,427,362 181.18 
Options exercised(1,839,723)18.92 
Options forfeited/cancelled(274,376)123.50 
Options outstanding at January 31, 202112,761,289 $57.48 5.0$2,794 
Options vested and exercisable at January 31, 20216,817,037 $17.50 2.9$1,765 
Options vested and exercisable at January 31, 2021 and expected to vest thereafter12,761,289 $57.48 5.0$2,794 
Summary of Restricted Stock Unit (RSU) Activity A summary of RSU activity for the fiscal year ended January 31, 2021 is as follows:
Unreleased restricted
stock units
Weighted 
average grant
date fair value
Balance at January 31, 20201,818,622 $95.23 
RSUs granted455,000 185.06 
RSUs vested(1,121,502)105.24 
RSUs forfeited / cancelled(119,905)111.50 
Balance at January 31, 20211,032,215 121.98 
Schedule of Weighted-Average Assumptions Used to Estimate Grant Date Fair Value of Options Granted
The following table presents the weighted-average assumptions used to estimate the grant date fair value of options granted during the periods presented:
Fiscal year ended January 31,
202120202019
Volatility39 %-42%39 %-41%41%
Expected term (in years)6.25-7.255.64-6.616.25-6.35
Risk-free interest rate0.33 %-1.43%1.39 %-2.52%2.57 %-2.74%
Dividend yield0%0%0%