BASIS OF PRESENTATION - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015	Aug. 31, 2013	Mar. 31, 2012
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note stated interest rate	9.75%	9.75%	9.75%
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note stated interest rate	11.00%	11.00%		11.00%
Fair Value, Inputs, Level 2 | Senior Secured Credit Facility | Bank Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	$ 18,355
Fair Value, Inputs, Level 2 | Senior Secured Credit Facility | Senior Secured Credit Facility - Term Loan A
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	97,938
Fair Value, Inputs, Level 2 | Senior Secured Credit Facility | Senior Secured Credit Facility - Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	771,754
Fair Value, Inputs, Level 2 | Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 623,025
Note stated interest rate	9.75%
Fair Value, Inputs, Level 2 | Senior Unsecured Notes | 2015 Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 97,625
Fair Value, Inputs, Level 2 | Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 100,190
Note stated interest rate	11.00%
Fair Value, Inputs, Level 2 | Carrying Value | Senior Secured Credit Facility | Bank Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	$ 19,000
Fair Value, Inputs, Level 2 | Carrying Value | Senior Secured Credit Facility | Senior Secured Credit Facility - Term Loan A
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit facility value	98,288
Fair Value, Inputs, Level 2 | Carrying Value | Senior Secured Credit Facility | Senior Secured Credit Facility - Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	765,495
Fair Value, Inputs, Level 2 | Carrying Value | Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	578,273
Fair Value, Inputs, Level 2 | Carrying Value | Senior Unsecured Notes | 2015 Senior Unsecured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	97,986
Fair Value, Inputs, Level 2 | Carrying Value | Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note value	$ 99,217