LONG-TERM DEBT - Senior Unsecured Notes (Details) (USD $)	Jun. 30, 2014	Sep. 30, 2013	Aug. 31, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Accrued interest payable	$ 31,005,000	$ 23,296,000
Senior Secured Notes | 2013 9 3/4% Senior Unsecured Notes, due September 2021
Debt Instrument [Line Items]
Loan face amount			500,000,000
Note stated interest rate			9.75%
Accrued interest payable	16,300,000	6,200,000
Senior Secured Notes | Third Lien Senior Secured Notes, 2012, 10 Point 5 Percent [Member]
Debt Instrument [Line Items]
Note stated interest rate			10.50%
Senior Subordinated Notes | 2012 11 % Senior Subordinated Notes
Debt Instrument [Line Items]
Loan face amount				344,200,000.0
Note stated interest rate	11.00%	11.00%	11.00%	11.00%
Debt Instrument, Repurchase Amount			69,000,000
Redeemable rate after cutoff				101.00%
Redeemable rate upon certain conditions				100.00%
Accrued interest payable	8,900,000	1,300,000
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes, due September 2021
Debt Instrument [Line Items]
Note stated interest rate	9.75%	9.75%
Debt Instrument, Redeemable Rate			100.00%
Redeemable rate after cutoff			101.00%
Redeemable rate upon certain conditions			100.00%
Senior Unsecured Notes | 2012 11 % Senior Subordinated Notes
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 69,000,000