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SHAREHOLDERS EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Class of Stock [Line Items]    
Remaining authorized repurchase amount (up to) $ 199,300  
Repurchase of common stock (in shares) 127,435 324,742
Repurchase of common stock $ 67,633 $ 37,917
Other than accelerated share repurchase program    
Class of Stock [Line Items]    
Repurchase of common stock (in shares) 960,716 694,990
Repurchase of common stock $ 67,600 $ 37,900
Repurchase of common stock (in dollars per share) $ 70.39 $ 54.56