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Stockholders' Equity - Equity Awards Available For Grants (Details)
shares in Thousands
12 Months Ended
Jan. 31, 2021
shares
Number Of Shares Available For Grant [Roll Forward]  
Available at beginning of fiscal year (in shares) 24,726
Awards authorized (in shares) 9,063
Shares granted (in shares) (4,032)
Shares canceled/expired (in shares) 21
Available at end of fiscal year (in shares) 32,901
RSUs  
Number Of Shares Available For Grant [Roll Forward]  
Shares granted (in shares) (4,022)
Shares canceled/expired (in shares) 886
Shares withheld for taxes (in shares) 2,258
Vesting period 4 years