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LONG-TERM DEBT - Senior Unsecured Notes (Details) (USD $)	Mar. 31, 2015	Sep. 30, 2014	Aug. 31, 2013
Debt Instrument [Line Items]
Accrued interest payable	$ 9,876,000us-gaap_InterestPayableCurrent	$ 8,659,000us-gaap_InterestPayableCurrent
Senior Unsecured 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%	9.75%	9.75%
Debt Instrument, Redeemable Rate			100.00%
Redeemable rate after cutoff			101.00%
Redeemable rate upon certain conditions			100.00%
Accrued interest payable	$ 4,100,000	$ 4,100,000

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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