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DEBT (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 08, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
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          
Available borrowings   $ 197,874,000   $ 197,874,000   $ 198,336,000
Outstanding letters of credit   2,126,000   2,126,000   $ 1,664,000
Interest expense and fees   141,000 $ 82,000 305,000 $ 248,000  
Letter of Credit            
Credit Agreement            
Maximum borrowing capacity $ 25,000,000          
New Credit Agreement            
Credit Agreement            
Outstanding borrowings   $ 0   $ 0    
New Credit Agreement | Base rate            
Credit Agreement            
Interest rate at end of period   3.25%   3.25%    
New Credit Agreement | Base rate | Minimum            
Credit Agreement            
Interest rate added to base rate 0.25%          
New Credit Agreement | Base rate | Maximum            
Credit Agreement            
Interest rate added to base rate 0.75%          
New Credit Agreement | LIBOR            
Credit Agreement            
Interest rate at end of period   1.44%   1.44%    
New Credit Agreement | LIBOR | Minimum            
Credit Agreement            
Interest rate added to base rate 1.125%          
New Credit Agreement | LIBOR | Maximum            
Credit Agreement            
Interest rate added to base rate 1.75%