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LONG-TERM DEBT: (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Mar. 31, 2016
Mar. 10, 2014
Long-term debt        
Total long-term debt and capital leases $ 176,744 $ 176,744 $ 192,856  
Less current installments 32,281 32,281 32,243  
Less deferred debt financing costs (2,122) (2,122) (2,716)  
Long-term debt, excluding current installments and deferred debt financing costs 142,341 142,341 157,897  
Long-term debt $ 142,341 $ 142,341 157,897  
LIBOR rate (as a percent) 0.85% 0.85%    
March 10, 2014 derivative agreement | Cash flow hedge        
Long-term debt        
Fixed interest rate payable on swap (as a percent)       0.98%
Notional amount of derivative       $ 50,000
Fair market value of the derivative $ 0 $ 0    
LIBOR | March 10, 2014 derivative agreement        
Long-term debt        
Long-term debt variable interest rate description   LIBOR    
Credit Agreement        
Long-term debt        
Outstanding letters of credit 800 $ 800    
Term loans        
Long-term debt        
Total long-term debt and capital leases 170,000 170,000 185,000  
Aggregate amount of borrowing commitment $ 300,000 $ 300,000    
Weighted-average interest rate on long-term debt (as a percent) 2.40% 2.40%    
Term loans | Quarterly installments payable through September 2017        
Long-term debt        
Required quarterly installment payments   $ 7,500    
Term loans | Quarterly installments payable through June 2018        
Long-term debt        
Required quarterly installment payments   11,300    
Term loans | Final payment due on October 9, 2018        
Long-term debt        
Final payment of long-term debt $ 106,300 106,300    
Term loans | LIBOR        
Long-term debt        
Long-term debt basis spread on variable interest rate (as a percent) 1.75%      
Revolving credit facility        
Long-term debt        
Aggregate amount of borrowing commitment $ 300,000 300,000    
Outstanding revolving credit borrowings   0 0  
Revolving credit facility dividend restrictions amount, maximum 30,000 $ 30,000    
Revolving credit facility | LIBOR        
Long-term debt        
Long-term debt basis spread on variable interest rate (as a percent)   1.75%    
Other debt and long-term liabilities        
Long-term debt        
Total long-term debt and capital leases $ 6,744 $ 6,744 $ 7,856