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LONG-TERM DEBT - Senior Unsecured Notes (Details) (USD $)	Jun. 30, 2013	Sep. 30, 2012	Mar. 06, 2012	Feb. 28, 2005
Debt Instrument [Line Items]
Debt outstanding	$ 1,680,415,000	$ 1,697,415,000
Accrued interest	24,395,000	46,362,000
Senior Unsecured Notes \| 2005 6 1/8% Senior Unsecured Notes
Debt Instrument [Line Items]
Loan face amount				250,000,000.0
Note stated interest rate	6.125%			6.125%
Principal amount tendered and exchanged			234,200,000
Debt outstanding	0	15,775,000	15,775,000
Accrued interest		$ 81,000

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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