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STOCKHOLDERS' EQUITY - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 28, 2021
Dec. 20, 2018
Share Repurchase Program      
Authorization to repurchase common stock not to exceed     $ 250.0
Number of shares repurchased (in shares) 164,678 164,678  
Treasury stock value $ 12.7 $ 12.7  
Remaining amount authorized of share repurchase program $ 182.6 $ 182.6  
Weighted Average      
Share Repurchase Program      
Shares purchased, weighted-average price (in dollars per share) $ 77.04 $ 77.04