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Share-Based Compensation Plans - Restricted stock unit activity (Details) - Restricted Stock Units (RSU) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Shares        
Outstanding at the beginning of the period (in shares) 322,000 213,000 118,000  
Granted/Earned (in shares) 262,000 162,000 95,000  
Vested (in shares)   (53,000) 0  
Vested or forfeited (in shares) (274,000)      
Outstanding at the end of the period (in shares) 310,000 322,000 213,000  
Weighted Average Grant Date Fair Value (per share)        
Outstanding at the beginning of the period (in dollars per share) $ 81.19 $ 66.50 $ 58.35  
Grant date fair value (in dollars per share) 96.44 96.90 76.62  
Vested in period, fair value at award date (in dollars per share)   70.14    
Vested or forfeited (in dollars per share) 78.71      
Outstanding at the end of the period (in dollars per share) $ 90.05 $ 81.19 $ 66.50  
Fair Value Outstanding        
Fair value outstanding $ 27,944 $ 31,418 $ 20,311 $ 9,041
Vested and settled (192,002) (15,643)    
Fair value of RSU vested and settled $ 62.88 $ 60.28