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Share-Based Compensation Plans - Restricted stock unit activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Weighted Average Grant Date Fair Value (per share)        
Vested in period, fair value at award date (in usd per share) $ 81.23 $ 62.88 $ 60.28  
Fair Value Outstanding        
Fair value of RSU vested and settled $ 141,541 $ 192,002 $ 15,643  
Vested and settled (in usd per share) (900)      
Vested and settled on active plans $ 120.70      
The 2018 Plan | Restricted Stock Units (RSU)        
Shares        
Outstanding at the beginning of the period (in shares) 0 0 0  
Granted/Earned (in shares) 79,000 0 0  
Vested or forfeited (in shares) (5,000) 0 0  
Outstanding at the end of the period (in shares) 74,000 0 0  
Weighted Average Grant Date Fair Value (per share)        
Outstanding at the beginning of the period (in usd per share) $ 0.00 $ 0.00 $ 0.00  
Grant date fair value (in usd per share) 125.40 0.00 0.00  
Vested in period, fair value at award date (in usd per share)   0.00 0.00  
Vested or forfeited (in usd per share) 124.71      
Outstanding at the end of the period (in usd per share) $ 125.45 $ 0.00 $ 0.00  
Fair Value Outstanding        
Fair value outstanding $ 9,202 $ 0 $ 0 $ 0
2008 Stock Incentive Plan | Restricted Stock Units (RSU)        
Shares        
Outstanding at the beginning of the period (in shares) 310,000 322,000 213,000  
Granted/Earned (in shares) 197,000 262,000 162,000  
Vested or forfeited (in shares) (155,000) (274,000) (53,000)  
Outstanding at the end of the period (in shares) 352,000 310,000 322,000  
Weighted Average Grant Date Fair Value (per share)        
Outstanding at the beginning of the period (in usd per share) $ 90.05 $ 81.19 $ 66.50  
Grant date fair value (in usd per share) 84.02 96.44 96.90  
Vested in period, fair value at award date (in usd per share)   78.71 70.14  
Vested or forfeited (in usd per share) 82.19      
Outstanding at the end of the period (in usd per share) $ 92.45 $ 90.05 $ 81.19  
Fair Value Outstanding        
Fair value outstanding $ 32,519 $ 27,944 $ 31,418 $ 20,311