Borrowings - Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Senior Notes	Sep. 30, 2013 Senior Notes	Sep. 30, 2014 Senior Notes 8 1/8% Senior Notes Maturing June 2016	Sep. 30, 2013 Senior Notes 8 1/8% Senior Notes Maturing June 2016	Sep. 30, 2014 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018	Sep. 30, 2013 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018	Sep. 30, 2014 Senior Notes 9 1/8% Senior Notes Maturing June 2018	Sep. 30, 2013 Senior Notes 9 1/8% Senior Notes Maturing June 2018	Sep. 30, 2014 Senior Notes 9 1/8% Senior Notes Maturing May 2019	Sep. 30, 2013 Senior Notes 9 1/8% Senior Notes Maturing May 2019	Sep. 30, 2014 Senior Notes 5 3/4% Senior Notes Maturing June 2019	Sep. 30, 2013 Senior Notes 5 3/4% Senior Notes Maturing June 2019	Sep. 30, 2014 Senior Notes 7 1/2% Senior Notes Maturing September 2021	Sep. 30, 2013 Senior Notes 7 1/2% Senior Notes Maturing September 2021	Sep. 30, 2014 Senior Notes 7 1/4% Senior Notes Maturing February 2023	Sep. 30, 2013 Senior Notes 7 1/4% Senior Notes Maturing February 2023	Feb. 01, 2013 Senior Notes 7 1/4% Senior Notes Maturing February 2023	Sep. 30, 2014 Senior Notes TEU Senior Amortizing Notes Maturing August 2015	Sep. 30, 2013 Senior Notes TEU Senior Amortizing Notes Maturing August 2015	Sep. 30, 2014 Junior Subordinated Notes	Sep. 30, 2013 Junior Subordinated Notes	Jun. 15, 2006 Junior Subordinated Notes	Sep. 30, 2014 Cash Secured Loans	Sep. 30, 2013 Cash Secured Loans	Sep. 30, 2014 Other Secured Notes Payable	Sep. 30, 2013 Other Secured Notes Payable
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)					8.125%	8.125%	6.625%	6.625%	9.125%	9.125%	9.125%	9.125%	5.75%	5.75%	7.50%	7.50%	7.25%	7.25%	7.25%					7.987%
Senior notes					$ 172,879	$ 172,879	$ 300,000	$ 300,000	$ 0	$ 298,000	$ 235,000	$ 235,000	$ 325,000	$ 0	$ 200,000	$ 200,000	$ 200,000	$ 200,000		$ 6,703	$ 16,141
Unamortized debt discounts	(4,399)	(5,160)	(4,399)	(5,160)																		(45,000)
Other debt																						55,737	53,670		22,368	22,368	22,145	19,285
Total debt, net	$ 1,535,433	$ 1,512,183	$ 1,435,183	$ 1,416,860