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DEBT - CREDIT AGREEMENT (Details) - USD ($)
12 Months Ended
Feb. 08, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Credit Agreement        
Credit Agreement        
Debt term 5 years      
Maximum borrowing capacity $ 200,000,000      
Amount of additional borrowings by which maximum borrowing capacity may be increased 250,000,000      
Outstanding borrowings   $ 0    
Credit Agreement Availability        
Available borrowings   198,336,000 $ 198,336,000  
Outstanding letters of credit   1,664,000 1,664,000  
Interest expense   $ 275,000 372,000  
Interest expense and fees     $ 472,000 $ 441,000
Credit Agreement | Base rate        
Credit Agreement        
Interest rate at end of period (as a percent)   5.50%    
Credit Agreement | Base rate | Minimum        
Credit Agreement        
Interest rate added to base rate (as a percent)   0.25%    
Credit Agreement | Base rate | Maximum        
Credit Agreement        
Interest rate added to base rate (as a percent)   0.75%    
Credit Agreement | LIBOR        
Credit Agreement        
Interest rate at end of period (as a percent)   1.66%    
Credit Agreement | LIBOR | Minimum        
Credit Agreement        
Interest rate added to base rate (as a percent)   1.125%    
Credit Agreement | LIBOR | Maximum        
Credit Agreement        
Interest rate added to base rate (as a percent)   1.75%    
Letter of Credit        
Credit Agreement        
Maximum borrowing capacity $ 25,000,000