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Equity Compensation - Summary of Restricted Stock Award and Restricted Stock Unit Activity (Details)
9 Months Ended
Oct. 31, 2021
$ / shares
shares
Restricted Stock Units (RSUs) and Performance Shares  
Unvested restricted stock units  
Unvested restricted stock units, beginning balance (in shares) 4,503,900
Granted (in shares) 1,895,000
Vested (in shares) (1,847,800)
Canceled/Forfeited (in shares) (430,300)
Unvested restricted stock units, ending balance (in shares) 4,112,900
Weighted average grant date fair value per share  
Unvested restricted stock units, beginning balance (in usd per share) | $ / shares $ 191.91
Granted (in usd per share) | $ / shares 290.63
Vested (in usd per share) | $ / shares 177.88
Canceled/Forfeited (in usd per share) | $ / shares 221.52
Unvested restricted stock units, ending balance (in usd per share) | $ / shares $ 243.72
Performance Stock Units  
Unvested restricted stock units  
Granted (in shares) 200,000
Performance Adjustment (in shares) (7,900)
Weighted average grant date fair value per share  
Performance Adjustment (in usd per share) | $ / shares $ 137.02
Performance Stock Units | Minimum  
Weighted average grant date fair value per share  
Performance shares units payout (in percentage) 103.00%
Performance Stock Units | Maximum  
Weighted average grant date fair value per share  
Performance shares units payout (in percentage) 108.00%