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LONG-TERM DEBT - Senior Subordinated Notes (Details) - USD ($)
Jun. 30, 2017
Sep. 30, 2016
Mar. 31, 2012
Debt Instrument [Line Items]      
Accrued interest payable $ 8,703,000 $ 5,512,000  
2012 11 % Senior Subordinated Notes | Senior Subordinated Notes      
Debt Instrument [Line Items]      
Loan face amount     $ 344,200,000.0
Note stated interest rate   11.00% 11.00%
Accrued interest payable   $ 490,000