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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. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Options        
Outstanding at the beginning of the period (in shares) 768 839 864  
Grants (in shares) 186 257 264  
Exercises (in shares) (178) (187) (239)  
Forfeitures / expirations (in shares) (127) (141) (50)  
Outstanding at the end of the period (in shares) 649 768 839 864
Exercisable at the end of the period (in shares) 128      
Weighted Average Exercise price (per share)        
Outstanding at the beginning of the period (in dollars per share) $ 42.76 $ 33.03 $ 29.89  
Grants (in dollars per share) 88.17 63.84 36.45  
Exercises (in dollars per share) 37.86 29.70 25.36  
Forfeitures / expirations (in dollars per share) 59.01 40.67 33.55  
Outstanding at the end of the period (in dollars per share) 53.94 42.76 33.03 $ 29.89
Exercisable at the end of the period (in dollars per share) 36.26      
Weighted Average Grant Date Fair Value (per share)        
Outstanding at the beginning of the period (in dollars per share) 16.28 12.38 11.98  
Grants (in dollars per share) 28.82 25.22 11.61  
Outstanding at the end of the period (in dollars per share) 19.52 $ 16.28 $ 12.38 $ 11.98
Exercisable at the end of the period (in dollars per share) $ 14.27      
Weighted Average Remaining Contractual Term        
Weighted Average Remaining Contractual Term (in years) 6 years 1 month 17 days 6 years 7 months 2 days 6 years 5 months 23 days 6 years 3 months 4 days
Exercisable at the end of the period 5 years 15 days      
Intrinsic Value        
Intrinsic value, options outstanding $ 26,847 $ 26,008 $ 27,081 $ 6,209
Intrinsic value, options exercised 9,480 $ 6,498 $ 4,663  
Intrinsic value, options exercisable $ 7,563