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Share-Based Compensation Plans - Summary of stock option activity (Details) - Stock Option Officers Employees and Consultants - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Options        
Outstanding at the beginning of the period (in shares) 649 768 839  
Grants (in shares) 2 186 257  
Exercises (in shares) (170) (178) (187)  
Forfeitures / expirations (in shares) (33) (127) (141)  
Outstanding at the end of the period (in shares) 448 649 768 839
Exercisable at the end of the period (in shares) 168      
Weighted Average Exercise price (per share)        
Outstanding at the beginning of the period (in dollars per share) $ 53.94 $ 42.76 $ 33.03  
Grants (in dollars per share) 102.04 88.17 63.84  
Exercises (in dollars per share) 43.07 37.86 29.70  
Forfeitures / expirations (in dollars per share) 65.68 59.01 40.67  
Outstanding at the end of the period (in dollars per share) 57.41 53.94 42.76 $ 33.03
Exercisable at the end of the period (in dollars per share) 46.37      
Weighted Average Grant Date Fair Value (per share)        
Outstanding at the beginning of the period (in dollars per share) 19.52 16.28 12.38  
Grants (in dollars per share) 28.74 28.82 25.22  
Outstanding at the end of the period (in dollars per share) 20.54 $ 19.52 $ 16.28 $ 12.38
Exercisable at the end of the period (in dollars per share) $ 17.30      
Weighted Average Remaining Contractual Term        
Weighted Average Remaining Contractual Term (in years) 5 years 6 years 1 month 6 days 6 years 7 months 6 days 6 years 6 months
Exercisable at the end of the period 4 years 3 months 18 days      
Intrinsic Value        
Intrinsic value, options outstanding $ 18,097 $ 26,847 $ 26,008 $ 27,081
Intrinsic value, options exercised 9,152 $ 9,480 $ 6,498  
Intrinsic value, options exercisable $ 8,647