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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
Options      
Outstanding, beginning of period (in shares) 894    
Granted (in shares) 145 400  
Forfeited (in shares) (6)    
Exercised (in shares) (138)    
Outstanding, end of period (in shares) 895   894
Options vested and exercisable (in shares) 575    
Weighted-Average Exercise Price      
Outstanding, weighted average exercise price, beginning of period (in dollars per share) $ 26    
Granted, weighted average exercise price (in dollars per share) 56    
Forfeited, weighted average exercise price (in dollars per share) 16    
Exercised, weighted average exercise price (in dollars per share) 23    
Outstanding, weighted average exercise price, end of period (in dollars per share) 31   $ 26
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 23    
Outstanding, weighted average remaining contractual term (in years) 5 years 7 months 6 days   5 years 2 months 12 days
Options vested and exercisable, weighted average remaining contractual term (in years) 3 years 9 months 18 days    
Outstanding aggregate intrinsic value $ 27.3   $ 23.9
Options vested and exercisable, aggregate intrinsic value $ 22.0