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Share-Based Compensation Plans - Restricted Stock Unit Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Weighted Average Grant Date Fair Value (per share)      
Shares issued from exceeding performance percentage 56    
Performance Shares      
Number of Restricted Share Awards      
Outstanding at the beginning of the period (in shares) 370    
Granted (in shares) 221    
Forfeited (in shares) (65)    
Outstanding at the end of the period (in shares) 470 370  
Weighted Average Grant Date Fair Value (per share)      
Outstanding at the beginning of the period (in dollars per share) $ 104.82    
Granted (in dollars per share) 170.27 $ 111.98 $ 86.97
Forfeited (in dollars per share) 155.62    
Outstanding at the end of the period (in dollars per share) $ 129.53 $ 104.82  
Restricted Stock Awards and Restricted Stock Units      
Number of Restricted Share Awards      
Forfeited (in shares) (14)    
Weighted Average Grant Date Fair Value (per share)      
Forfeited (in dollars per share) $ 132.69    
2008 Stock Incentive Plan | Performance Shares      
Number of Restricted Share Awards      
Vested (in shares) (56)    
Weighted Average Grant Date Fair Value (per share)      
Vested (in dollars per share) $ 97.05    
2008 Stock Incentive Plan | Restricted Stock Awards and Restricted Stock Units      
Number of Restricted Share Awards      
Outstanding at the beginning of the period (in shares) 168    
Granted (in shares) 50    
Vested (in shares) (78)    
Outstanding at the end of the period (in shares) 126 168  
Weighted Average Grant Date Fair Value (per share)      
Outstanding at the beginning of the period (in dollars per share) $ 106.17    
Granted (in dollars per share) 179.30    
Vested (in dollars per share) 110.50    
Outstanding at the end of the period (in dollars per share) 129.52 $ 106.17  
The 2018 Plan | Restricted Stock Awards and Restricted Stock Units      
Weighted Average Grant Date Fair Value (per share)      
Granted (in dollars per share) $ 179.30 $ 118.76 $ 106.28
Maximum      
Weighted Average Grant Date Fair Value (per share)      
Target percentage for performance stock awards 200.00%