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SHARE-BASED COMPENSATION, Stock Option and Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
7 Months Ended 12 Months Ended 67 Months Ended 115 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2018
Mar. 31, 2018
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 0
Additional Disclosures [Abstract]            
Vested share-based awards withheld to satisfy income tax obligations (in shares)   57,725 59,472      
Vested share-based awards withheld to satisfy income tax obligations   $ 4.4 $ 2.6      
Restricted Stock [Member]            
Number of Shares [Roll Forward]            
Nonvested at beginning of period (in shares)   371,689        
Granted (in shares)   72,623        
Vested (in shares)   (156,607)        
Forfeited (in shares)   (5,470)        
Nonvested at end of period (in shares) 282,235 282,235 371,689   282,235 282,235
Weighted Average Grant-date Fair Value [Roll Forward]            
Nonvested at beginning of period (in dollars per share)   $ 40.45        
Granted (in dollars per share)   80.24 $ 43.15 $ 40.89    
Vested (in dollars per share)   38.55        
Forfeited (in dollars per share)   43.15        
Nonvested at end of period (in dollars per share) $ 51.69 $ 51.69 $ 40.45   $ 51.69 $ 51.69
Aggregated fair value of restricted shares   $ 6.0 $ 6.0 $ 4.7    
Additional Disclosures [Abstract]            
Vested share-based awards withheld to satisfy income tax obligations (in shares)   57,725 59,472      
Vested share-based awards withheld to satisfy income tax obligations   $ 4.4 $ 2.6      
2008 Director LTIP [Member] | Restricted Stock [Member]            
Number of Shares [Roll Forward]            
Granted (in shares)   535       258,143
2012 Employee LTIP [Member] | Restricted Stock [Member]            
Number of Shares [Roll Forward]            
Granted (in shares)   66,530     749,576  
2017 Director LTIP [Member] | Restricted Stock [Member]            
Number of Shares [Roll Forward]            
Granted (in shares) 5,558 5,558