BASIS OF PRESENTATION - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	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	$ 7,910
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	113,064
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	714,556
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	$ 528,750
Note stated interest rate	9.75%
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	$ 276,222
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	$ 8,000
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	113,654
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	712,270
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	500,000
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	$ 272,233