v3.20.4
Stock-Based Compensation - Stock Option Activity (Details) - Options
 12 Months Ended
Jan. 31, 2021
$ / shares
shares
Number of Shares  
Options outstanding, beginning balance (in shares) | shares 14,689,000
Options granted (in shares) | shares 97,000
Options exercised (in shares) | shares (7,752,000)
Options canceled (in shares) | shares (388,000)
Options outstanding, ending balance (in shares) | shares 6,646,000
Options, vested and expected to vest (in shares) | shares 6,646,000
Options exercisable (in shares) | shares 3,377,000
Weighted- Average Exercise Price Per Share  
Options outstanding, beginning balance, weighted average exercise price (in usd per share) | $ / shares $ 5.52
Options granted, weighted average exercise price (in usd per share) | $ / shares 64.64
Options exercised, weighted average exercise price (in usd per share) | $ / shares 3.72
Options canceled, weighted average exercise price per share (in usd per share) | $ / shares 9.66
Options outstanding, ending balance, weighted average exercise price (in usd per share) | $ / shares 8.24
Options vested and expected to vest, weighted average exercise price (in usd per share) | $ / shares 8.24
Options exercisable, weighted average exercise price (in usd per share) | $ / shares $ 5.13