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Equity Plans and Stock-based Compensation - Summary of stock option awards (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jul. 31, 2021
USD ($)
$ / shares
shares
Jan. 31, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock option awards outstanding beginning balance | shares 30,166,792  
Number of stock option awards exercised | shares (3,292,219)  
Number of stock option awards forfeited | shares (452,893)  
Number of stock option awards expired | shares (19,963)  
Number of stock option awards outstanding ending balance | shares 26,401,717 30,166,792
Number of stock option awards options vested and expected to vest | shares 25,667,621  
Number of stock option awards exercisable | shares 16,457,228  
Weighted average exercise price outstanding beginning balance | $ / shares $ 0.71  
Weighted average exercise price exercised | $ / shares 0.53  
Weighted average exercise price forfeited | $ / shares 0.73  
Weighted average exercise price expired | $ / shares 53.22  
Weighted average exercise price outstanding ending balance | $ / shares 0.69 $ 0.71
Weighted average exercise price options vested and expected to vest | $ / shares 0.69  
Weighted average exercise price exercisable | $ / shares $ 0.66  
Weighted average remaining contractual term 7 years 7 years 3 months 18 days
Weighted average remaining contractual term options vested and expected to vest 7 years  
Weighted average remaining contractual term exercisable 6 years 3 months 18 days  
Aggregate intrinsic value outstanding | $ $ 606,280 $ 1,064,539
Aggregate intrinsic value options vested and expected to vest | $ 589,470  
Aggregate intrinsic value exercisable | $ $ 378,402