Borrowings - Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Unamortized debt discounts	$ (20,348)	$ (23,243)
Long-term debt	1,442,407	1,488,826
Senior Notes
Debt Instrument [Line Items]
Unamortized debt discounts	(20,348)	(23,243)
Long-term debt	1,125,377	1,132,152
Senior Notes | 6 7/8% Senior Notes Maturing July 2015
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	6.875%
Senior notes	172,454	172,454
Senior Notes | 8 1/8% Senior Notes Maturing June 2016
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	8.125%
Senior notes	172,879	172,879
Senior Notes | 12% Senior Secured Notes Maturing October 2017
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	12.00%
Senior notes	250,000	250,000
Senior Notes | 9 1/8% Senior Notes Maturing June 2018
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	9.125%
Senior notes	300,000	300,000
Senior Notes | 9 1/8% Senior Notes Maturing May 2019
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	9.125%
Senior notes	250,000	250,000
Senior Notes | TEU Senior Amortizing Notes
Debt Instrument [Line Items]
Senior notes	392	10,062
Convertible Subordinated Debt
Debt Instrument [Line Items]
Long-term debt	9,402	57,500
Junior Subordinated Notes
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	7.987%
Unamortized debt discounts	49,700
Long-term debt	51,087	49,537
Cash Secured Loan
Debt Instrument [Line Items]
Long-term debt	247,368	247,368
Other Secured Notes Payable
Debt Instrument [Line Items]
Long-term debt	$ 9,173	$ 2,269