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Equity - Awards Available for Grant (Details) - shares
12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Awards Available For Grant [Roll Forward]      
Balance, beginning of period (in shares) 4,796,000 1,540,000  
Awards authorized (in shares) 22,532,000 5,788,000  
Options granted (in shares) (7,936,000) (4,622,000) (10,632,000)
Options cancelled and forfeited (in shares) 2,044,000 1,970,000  
Options repurchased (in shares) 92,000 120,000  
Balance, end of period (in shares) 18,248,000 4,796,000 1,540,000
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Awards Available For Grant [Roll Forward]      
RSUs granted (in shares) (3,290,000) 0  
RSUs cancelled and forfeited (in shares) 10,000 0