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Share-Based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Aug. 22, 2018
Options          
Grants (in shares) 0 0 0    
Employee Stock          
Share-based compensation plans          
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock         15.00%
Stock options          
Options          
Outstanding at the beginning of the period (in shares) 163,000 300,000 448,000    
Grants (in shares) 0 0 0    
Exercises (in shares) (93,000) (126,000) (126,000)    
Forfeitures / expirations (in shares) (1,000) (11,000) (22,000)    
Outstanding at the end of the period (in shares) 69,000 163,000 300,000 448,000  
Exercisable at the end of the period (in shares) 66,000        
Weighted Average Exercise Price (per share)          
Outstanding at the beginning of the period (in dollars per share) $ 63.47 $ 58.35 $ 57.41    
Grants (in dollars per share) 0 0 0    
Exercises (in dollars per share) 57.09 49.82 52.28    
Forfeitures / expirations (in dollars per share) 87.61 80.33 72.37    
Outstanding at the end of the period (in dollars per share) 71.78 63.47 58.35 $ 57.41  
Exercisable at the end of the period (in dollars per share) 71.10        
Weighted Average Grant Date Fair Value (per share)          
Outstanding at the beginning of the period (in dollars per share) 48.64 32.04 20.54    
Grants (in dollars per share) 0 0 0    
Outstanding at the end of the period (in dollars per share) 92.82 $ 48.64 $ 32.04 $ 20.54  
Exercisable at the end of the period (in dollars per share) $ 93.50        
Weighted Average Remaining Contractual Term (in years)          
Weighted average remaining contractual term (in years) 3 years 2 months 12 days 3 years 7 months 6 days 4 years 3 months 18 days 5 years  
Exercisable at the end of the period (in shares) 3 years 1 month 6 days        
Intrinsic Value          
Outstanding at the beginning of the period (in shares) $ 7,925 $ 9,606 $ 18,097    
Exercises (in shares) 9,059 6,414 5,400    
Outstanding at the end of the period (in shares) 6,333 $ 7,925 $ 9,606 $ 18,097  
Exercisable at the end of the period (in shares) $ 6,157