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SHAREHOLDERS EQUITY (Details) - USD ($)
 2 Months Ended 3 Months Ended 9 Months Ended
Jun. 16, 2015
Apr. 14, 2015
Apr. 10, 2015
Jun. 16, 2015
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Class of Stock [Line Items]                
Accelerated share repurchase program, up-front payment     $ 100,000,000          
Repurchase of common stock (in shares) 324,742 1,630,988   1,955,730   1,275,748   6,154,760
Accelerated share repurchases (in dollars per share)       $ 51.13        
Repurchase of common stock             $ 83,335,000 $ 228,540,000
Repurchase of common stock (in dollars per share)         $ 66.18 $ 44.37 $ 57.83 $ 37.13
Remaining authorized repurchase amount         $ 319,500,000   $ 319,500,000  
Other than accelerated share repurchase program                
Class of Stock [Line Items]                
Repurchase of common stock (in shares)         120,327   1,440,890  
Repurchase of common stock         $ 8,000,000 $ 56,600,000 $ 83,300,000 $ 228,500,000