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Share-Based Compensation Plans - Summary of stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Options        
Grants (in shares) 0      
Stock Option Officers Employees and Consultants        
Options        
Outstanding at the beginning of the period (in shares) 448,000 649,000 768,000  
Grants (in shares)   2,000 186,000  
Exercises (in shares) (126,000) (170,000) (178,000)  
Forfeitures / expirations (in shares) (22,000) (33,000) (127,000)  
Outstanding at the end of the period (in shares) 300,000 448,000 649,000 768,000
Exercisable at the end of the period (in shares) 175,000      
Weighted Average Exercise price (per share)        
Outstanding at the beginning of the period (in dollars per share) $ 57.41 $ 53.94 $ 42.76  
Grants (in dollars per share)   102.04 88.17  
Exercises (in dollars per share) 52.28 43.07 37.86  
Forfeitures / expirations (in dollars per share) 72.37 65.68 59.01  
Outstanding at the end of the period (in dollars per share) 58.35 57.41 53.94 $ 42.76
Exercisable at the end of the period (in dollars per share) 49.18      
Weighted Average Grant Date Fair Value (per share)        
Outstanding at the beginning of the period (in dollars per share) 20.54 19.52 16.28  
Grants (in dollars per share)   28.74 28.82  
Outstanding at the end of the period (in dollars per share) 32.04 $ 20.54 $ 19.52 $ 16.28
Exercisable at the end of the period (in dollars per share) $ 41.11      
Weighted Average Remaining Contractual Term        
Weighted Average Remaining Contractual Term (in years) 4 years 3 months 18 days 5 years 6 years 1 month 6 days 6 years 7 months 6 days
Exercisable at the end of the period 3 years 10 months 24 days      
Intrinsic Value        
Intrinsic value, options outstanding $ 9,606 $ 18,097 $ 26,847 $ 26,008
Intrinsic value, options exercised 5,400 $ 9,152 $ 9,480  
Intrinsic value, options exercisable $ 7,198