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Equity Compensation - Summary of Restricted Stock Activity (Details) - $ / shares
12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs)      
Unreleased Restricted Stock Units (in thousands)      
Unvested restricted stock, beginning balance (in shares) 4,503,900    
Granted (in shares) 2,294,100    
Vested (in shares) (2,230,700)    
Canceled/Forfeited (in shares) (526,700)    
Performance adjustment (in shares) (7,900)    
Unvested restricted stock, ending balance (in shares) 4,032,700 4,503,900  
Weighted average grant date fair value per share      
Unvested restricted stock, beginning balance (in dollars per share) $ 191.91    
Granted (in dollars per share) 288.13 $ 224.20 $ 156.24
Vested (in dollars per share) 181.97    
Canceled/Forfeited (in dollars per share) 226.00    
Performance adjustment (in dollars per share) 137.02    
Unvested restricted stock, ending balance (in dollars per share) $ 251.17 $ 191.91  
Performance Stock Unit      
Unreleased Restricted Stock Units (in thousands)      
Granted (in shares) 200,000    
Unvested restricted stock, ending balance (in shares) 400,000    
Performance Stock Unit | Minimum      
Weighted average grant date fair value per share      
Performance shares payout   103.00%  
Performance Stock Unit | Maximum      
Weighted average grant date fair value per share      
Performance shares payout   108.00%