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SHARE-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Additional Disclosures [Abstract]    
Vested share-based awards withheld to satisfy income tax obligations (in shares) 37,640 41,817
Vested share-based awards withheld to satisfy income tax obligations $ 2.7 $ 3.0
Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Nonvested at beginning of period (in shares) 193,580  
Granted (in shares) 99,182  
Vested (in shares) (110,155)  
Forfeited (in shares) 0  
Nonvested at end of period (in shares) 182,607  
Weighted Average Grant-date Fair Value [Roll Forward]    
Nonvested at beginning of period (in dollars per share) $ 73.74  
Granted (in dollars per share) 71.81  
Vested (in dollars per share) 70.00  
Forfeited (in dollars per share) 0  
Nonvested at end of period (in dollars per share) $ 74.95  
2017 Director LTIP [Member] | Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Granted (in shares) 9,309 8,132
2012 Employee LTIP [Member] | Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Granted (in shares) 89,873 85,132
Additional Disclosures [Abstract]    
Vested share-based awards withheld to satisfy income tax obligations (in shares) 37,640  
Vested share-based awards withheld to satisfy income tax obligations $ 2.7