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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
May 31, 2016
Options      
Outstanding, beginning of period (in shares) 811,000    
Granted (in shares) 72,733 72,393  
Forfeited (in shares) (1,000)    
Exercised (in shares) (111,000)    
Outstanding, end of period (in shares) 772,000   811,000
Options vested and exercisable (in shares) 515,000    
Weighted-Average Exercise Price      
Outstanding, weighted average exercise price, beginning of period (in dollars per share) $ 32    
Granted, weighted average exercise price (in dollars per share) 75    
Forfeited, weighted average exercise price (in dollars per share) 23    
Exercised, weighted average exercise price (in dollars per share) 20    
Outstanding, weighted average exercise price, end of period (in dollars per share) 38   $ 32
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 29    
Outstanding, weighted average remaining contractual term (in years) 6 years 4 months 24 days   5 years 9 months 18 days
Options vested and exercisable, weighted average remaining contractual term (in years) 5 years 1 month 6 days    
Outstanding aggregate intrinsic value $ 29.9   $ 36.8
Options vested and exercisable, aggregate intrinsic value $ 24.2