Contractual interest rate for funds borrowed, under the debt agreement.

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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Feb. 01, 2013	Jun. 15, 2006
Debt Instrument [Line Items]
Unamortized debt discounts	$ (3,639)	$ (4,399)
Total debt, net	1,528,275	1,535,433
Senior Notes
Debt Instrument [Line Items]
Unamortized debt discounts	(3,639)	(4,399)
Total debt, net	$ 1,427,240	$ 1,435,183
Senior Notes \| 8 1/8% Senior Notes Maturing June 2016
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	8.125%	8.125%
Total debt, net	$ 170,879	$ 172,879
Senior Notes \| 6 5/8% Senior Secured Notes Maturing April 2018
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	6.625%	6.625%
Total debt, net	$ 300,000	$ 300,000
Senior Notes \| 9 1/8% Senior Notes Maturing June 2018
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	9.125%	9.125%
Senior Notes \| 9 1/8% Senior Notes Maturing May 2019
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	9.125%	9.125%
Total debt, net	$ 235,000	$ 235,000
Senior Notes \| 5 3/4% Senior Notes Maturing June 2019
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	5.75%	5.75%
Total debt, net	$ 325,000	$ 325,000
Senior Notes \| 7 1/2% Senior Notes Maturing September 2021
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	7.50%	7.50%
Total debt, net	$ 200,000	$ 200,000
Senior Notes \| 7 1/4% Senior Notes Maturing February 2023
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	7.25%	7.25%	7.25%
Total debt, net	$ 200,000	$ 200,000
Senior Notes \| TEU Senior Amortizing Notes Maturing July 2015
Debt Instrument [Line Items]
Total debt, net	0	6,703
Junior Subordinated Notes
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)				7.987%
Unamortized debt discounts	(43,000)
Total debt, net	57,803	55,737
Cash Secured Loans
Debt Instrument [Line Items]
Total debt, net		22,368
Other Secured Notes Payable
Debt Instrument [Line Items]
Total debt, net	$ 20,864	$ 22,145