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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Nov. 30, 2016
Nov. 30, 2015
May 31, 2016
Options      
Outstanding, beginning of period (in shares) 811,000    
Granted (in shares) 73,000 100,000.0  
Forfeited (in shares) (1,000)    
Exercised (in shares) (124,000)    
Outstanding, end of period (in shares) 759,000   811,000
Options vested and exercisable (in shares) 502,000    
Weighted-Average Exercise Price      
Outstanding, weighted average exercise price, beginning of period (in USD per share) $ 31.81    
Granted, weighted average exercise price (in USD per share) 74.66    
Forfeited, weighted average exercise price (in USD per share) 22.93    
Exercised, weighted average exercise price (in USD per share) 22.26    
Outstanding, weighted average exercise price, end of period (in USD per share) 37.51   $ 31.81
Options vested and exercisable, weighted average exercise price (in USD per share) $ 28.88    
Outstanding, weighted average remaining contractual term (in years) 6 years 1 month 6 days   5 years 9 months 18 days
Options vested and exercisable, weighted average remaining contractual term (in years) 4 years 9 months 18 days    
Outstanding aggregate intrinsic value $ 25.0   $ 36.8
Options vested and exercisable, aggregate intrinsic value $ 20.6