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Borrowings - Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Senior Notes | Sep. 30, 2011 Senior Notes | Sep. 30, 2012 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Sep. 30, 2011 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Sep. 30, 2012 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Sep. 30, 2011 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Sep. 30, 2012 Senior Notes 12% Senior Secured Notes Maturing October 2017 | Jul. 31, 2012 Senior Notes 12% Senior Secured Notes Maturing October 2017 | Sep. 30, 2011 Senior Notes 12% Senior Secured Notes Maturing October 2017 | Sep. 30, 2012 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018 | Jul. 31, 2012 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018 | Sep. 30, 2011 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Sep. 30, 2011 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Sep. 30, 2011 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Sep. 30, 2012 Senior Notes TEU Senior Amortizing Notes Maturing August 2013 | Sep. 30, 2011 Senior Notes TEU Senior Amortizing Notes Maturing August 2013 | Sep. 30, 2012 Senior Notes TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2011 Senior Notes TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2012 Mandatory Convertible Subordinated Debt | Sep. 30, 2011 Mandatory Convertible Subordinated Debt | Sep. 30, 2012 Junior Subordinated Notes | Sep. 30, 2011 Junior Subordinated Notes | Jun. 15, 2006 Junior Subordinated Notes | Sep. 30, 2012 Cash Secured Loan | Sep. 30, 2011 Cash Secured Loan | Sep. 30, 2012 Other Secured Notes Payable | Sep. 30, 2011 Other Secured Notes Payable
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  | 6.875% | 6.875% | 8.125% | 8.125% | 12.00% | 12.00% | 12.00% | 6.625% | 6.625% | 6.625% | 9.125% | 9.125% | 9.125% | 9.125% |  |  |  |  |  |  | 7.987% |  | 7.987% |  |  |  |
Senior notes |  |  |  |  | $ 172,454 | $ 172,454 | $ 172,879 | $ 172,879 | $ 0 |  | $ 250,000 | $ 300,000 |  | $ 0 | $ 300,000 | $ 300,000 | $ 235,000 | $ 250,000 | $ 316 | $ 10,062 | $ 23,500 | $ 0 |  |  |  |  |  |  |  |  |
Unamortized debt discounts | (3,082) | (23,243) | (3,082) | (23,243) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,200 |  |  |  |  |  |
Total debt, net | $ 1,498,198 | $ 1,488,826 | $ 1,201,067 | $ 1,132,152 |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,402 | $ 57,500 | $ 51,603 | $ 49,537 |  | $ 227,368 | $ 247,368 | $ 8,758 | $ 2,269

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