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SHARE-BASED COMPENSATION, Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Additional Disclosures [Abstract]    
Vested share-based awards withheld to satisfy income tax obligations (in shares) 27,715 37,640
Vested share-based awards withheld to satisfy income tax obligations $ 2.6 $ 2.7
Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Nonvested at beginning of period (in shares) 183,378  
Granted (in shares) 84,254  
Vested (in shares) (92,093)  
Nonvested at end of period (in shares) 175,539  
Weighted Average Grant-date Fair Value [Roll Forward]    
Nonvested at beginning of period (in dollars per share) $ 74.97  
Granted (in dollars per share) 92.99  
Vested (in dollars per share) 78.12  
Nonvested at end of period (in dollars per share) $ 82.00  
2017 Director LTIP [Member] | Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Granted (in shares) 6,393 9,309
2012 Employee LTIP [Member] | Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Granted (in shares) 77,861 89,873