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DEBT (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 28, 2021
Feb. 08, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Credit Agreement              
Credit Agreement              
Increase in borrowing capacity $ 50,000,000            
Debt term   5 years          
Maximum borrowing capacity   $ 250,000,000          
Amount of additional borrowings by which maximum borrowing capacity may be increased   200,000,000          
Available borrowings     $ 247,782,000   $ 247,782,000   $ 197,874,000
Outstanding letters of credit     2,218,000   2,218,000   $ 2,126,000
Interest expense and fees     113,000 $ 82,000 257,000 $ 164,000  
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     0.09%   0.09%    
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%