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Borrowings - Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012 | Mar. 31, 2013 Senior Notes | Sep. 30, 2012 Senior Notes | Jul. 17, 2012 Senior Notes Tangible Equity Units | May 31, 2010 Senior Notes Tangible Equity Units | Mar. 31, 2013 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Sep. 30, 2012 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Mar. 31, 2013 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Sep. 30, 2012 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Mar. 31, 2013 Senior Notes 6 5/8% Senior Secured Notes | Sep. 30, 2012 Senior Notes 6 5/8% Senior Secured Notes | Mar. 31, 2013 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Mar. 31, 2013 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Mar. 31, 2013 Senior Notes TEU Senior Amortizing Notes | Sep. 30, 2012 Senior Notes TEU Senior Amortizing Notes | Mar. 31, 2013 Senior Notes TEU Senior Amortizing Notes | Sep. 30, 2012 Senior Notes TEU Senior Amortizing Notes | Mar. 31, 2013 Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Feb. 01, 2013 Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Sep. 30, 2012 Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Mar. 31, 2013 Convertible Subordinated Debt | Sep. 30, 2012 Convertible Subordinated Debt | Mar. 31, 2013 Junior Subordinated Notes | Sep. 30, 2012 Junior Subordinated Notes | Mar. 31, 2013 Cash Secured Loan | Sep. 30, 2012 Cash Secured Loan | Mar. 31, 2013 Other Secured Notes Payable | Sep. 30, 2012 Other Secured Notes Payable
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  | 7.50% | 7.25% | 6.875% | 6.875% | 8.125% | 8.125% | 6.625% | 6.625% | 9.125% | 9.125% | 9.125% | 9.125% |  |  |  |  | 7.25% | 7.25% | 0.00% |  |  | 7.987% |  |  |  |  |
Senior notes |  |  |  |  |  |  | $ 0 | $ 172,454 | $ 172,879 | $ 172,879 | $ 300,000 | $ 300,000 | $ 298,000 | $ 300,000 | $ 235,000 | $ 235,000 | $ 161 | $ 316 | $ 19,885 | $ 23,500 | $ 200,000 |  | $ 0 |  |  |  |  |  |  |  |
Unamortized debt discounts | (2,440) | (3,082) | (2,440) | (3,082) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,100 |  |  |  |  |
Long-term debt | $ 1,507,153 | $ 1,498,198 | $ 1,223,485 | $ 1,201,067 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 9,402 | $ 52,637 | $ 51,603 | $ 222,368 | $ 227,368 | $ 8,663 | $ 8,758

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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