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DEBT - CREDIT AGREEMENT (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Credit Agreement            
Credit Agreement            
Maximum borrowing capacity $ 100,000          
Amount of additional borrowings by which maximum borrowing capacity may be increased $ 100,000          
Outstanding borrowings   $ 0   $ 0   $ 0
Credit Agreement Availability            
Minimum liquidity level allowing unrestricted access to the Credit Agreement       300,000    
Available borrowings   98,271   98,271   98,335
Outstanding letters of credit   1,729   1,729   $ 1,664
Interest expense and fees   $ 111 $ 111 $ 221 $ 221  
Trailing period for measurement of interest coverage ratio 12 months          
Maximum liquidity level triggering the requirement to maintain an interest coverage ratio of one to one $ 30,000          
Credit Agreement | Minimum            
Credit Agreement            
Monthly fee on unused available balance (as a percent) 0.25%          
Credit Agreement Availability            
Interest coverage ratio 1          
Credit Agreement | Maximum            
Credit Agreement            
Monthly fee on unused available balance (as a percent) 0.375%          
Credit Agreement | Base rate            
Credit Agreement            
Interest rate, variable rate basis       base rate    
Interest rate at end of period (as a percent)   3.75%   3.75%    
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, variable rate basis       LIBOR    
Interest rate at end of period (as a percent)   1.77%   1.77%    
Credit Agreement | LIBOR | Minimum            
Credit Agreement            
Interest rate added to base rate (as a percent) 1.25%          
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 $ 5,000