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SHAREHOLDERS EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Class of Stock [Line Items]        
Remaining authorized repurchase amount (up to) $ 94,500   $ 94,500  
Repurchase of common stock (in shares)     127,435 324,742
Repurchase of common stock     $ 172,405 $ 75,369
Other than accelerated share repurchase program        
Class of Stock [Line Items]        
Repurchase of common stock (in shares) 1,470,643 625,573 2,431,359 1,320,563
Repurchase of common stock $ 104,800 $ 37,500 $ 172,400 $ 75,400
Repurchase of common stock (in USD per share) $ 71.24 $ 59.87 $ 70.91 $ 57.07