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SHARE-BASED COMPENSATION, Stock Option and Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended 31 Months Ended 91 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2020
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted (in shares) 0 0 0    
Options outstanding (in shares) 0 0 0 0 0
Additional Disclosures [Abstract]          
Vested share-based awards withheld to satisfy income tax obligations (in shares) 41,817 40,092      
Vested share-based awards withheld to satisfy income tax obligations $ 3.0 $ 3.9      
Restricted Stock [Member]          
Number of Shares [Roll Forward]          
Nonvested at beginning of period (in shares) 224,000        
Granted (in shares) 94,019        
Vested (in shares) (123,250)        
Forfeited (in shares) (1,189)        
Nonvested at end of period (in shares) 193,580 224,000   193,580 193,580
Weighted Average Grant-date Fair Value [Roll Forward]          
Nonvested at beginning of period (in dollars per share) $ 67.70        
Granted (in dollars per share) 72.93 $ 94.22 $ 80.24    
Vested (in dollars per share) 62.07        
Forfeited (in dollars per share) 81.84        
Nonvested at end of period (in dollars per share) $ 73.74 $ 67.70   $ 73.74 $ 73.74
Aggregated fair value of restricted shares $ 7.6 $ 6.6 $ 6.0    
Additional Disclosures [Abstract]          
Vested share-based awards withheld to satisfy income tax obligations (in shares) 41,817 40,092      
Vested share-based awards withheld to satisfy income tax obligations $ 3.0 $ 3.9      
2017 Director LTIP [Member] | Restricted Stock [Member]          
Number of Shares [Roll Forward]          
Granted (in shares) 8,887     23,243  
2012 Employee LTIP [Member] | Restricted Stock [Member]          
Number of Shares [Roll Forward]          
Granted (in shares) 85,132       904,555