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Borrowings - Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Senior Notes | Sep. 30, 2012 Senior Notes | Sep. 30, 2013 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Sep. 30, 2012 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Sep. 30, 2013 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Sep. 30, 2012 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Sep. 30, 2013 Senior Notes 12% Senior Secured Notes Maturing October 2017 | Sep. 30, 2012 Senior Notes 12% Senior Secured Notes Maturing October 2017 | Sep. 30, 2013 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018 | Sep. 30, 2012 Senior Notes 6 5/8% Senior Secured Notes Maturing April 2018 | Sep. 30, 2013 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Sep. 30, 2013 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Sep. 30, 2013 Senior Notes 7 1/2% Senior Notes Maturing September 2021 [Member] [Member] | Sep. 30, 2012 Senior Notes 7 1/2% Senior Notes Maturing September 2021 [Member] [Member] | Sep. 30, 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] | Sep. 30, 2013 Senior Notes TEU Senior Amortizing Notes Maturing August 2013 | Sep. 30, 2012 Senior Notes TEU Senior Amortizing Notes Maturing August 2013 | Sep. 30, 2013 Senior Notes TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2012 Senior Notes TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2013 Mandatory Convertible Subordinated Debt | Sep. 30, 2012 Mandatory Convertible Subordinated Debt | Sep. 30, 2013 Junior Subordinated Notes | Sep. 30, 2012 Junior Subordinated Notes | Jun. 15, 2006 Junior Subordinated Notes | Sep. 30, 2013 Cash Secured Loan | Sep. 30, 2012 Cash Secured Loan | Sep. 30, 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) |  |  |  |  | 6.875% | 6.875% | 8.125% | 8.125% | 12.00% | 12.00% | 6.625% | 6.625% | 9.125% | 9.125% | 9.125% | 9.125% | 7.50% | 0.00% | 7.25% | 7.25% | 0.00% |  |  |  |  |  |  | 7.987% |  | 7.987% |  |  |  |
Senior notes |  |  |  |  | $ 0 | $ 172,454 | $ 172,879 | $ 172,879 |  |  | $ 300,000 | $ 300,000 | $ 298,000 | $ 300,000 | $ 235,000 | $ 235,000 | $ 200,000 | $ 0 | $ 200,000 |  | $ 0 | $ 0 | $ 316 | $ 16,141 | $ 23,500 |  |  |  |  |  |  |  |  |
Unamortized debt discounts | (5,160) | (3,082) | (5,160) | (3,082) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,100 |  |  |  |  |  |
Total debt, net |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 9,402 | 53,670 | 51,603 |  | 22,368 | 227,368 | 19,285 | 8,758
Notes Payable | $ 1,512,183 | $ 1,498,198 | $ 1,416,860 | $ 1,201,067 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: 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. + Details
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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 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 2: 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 3: 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 Reference 4: 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. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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 3: 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 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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