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STOCKHOLDERS' EQUITY - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2020
Dec. 20, 2018
Share Repurchase Program    
Authorization to repurchase common stock not to exceed   $ 250.0
Number of shares repurchased (in shares) 287,239  
Treasury stock value $ 22.9  
Remaining amount authorized of share repurchase program $ 195.3  
Weighted Average    
Share Repurchase Program    
Shares purchased, weighted-average price (in dollars per share) $ 79.56