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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Jun. 15, 2006
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 1,231,254 | $ 1,327,412 |  |
Debt Instrument, Unamortized Premium | $ (2,640) | (3,413) |  |
5 3/4% Senior Notes Maturing June 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 5.75% |  |  |
8 3/4% Senior Notes Maturing March 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 8.75% |  |  |
7 1/4% Senior Notes Maturing February 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 7.25% |  |  |
6 3/4% Senior Notes Maturing March of 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 6.75% |  |  |
5 7/8% Senior Notes Maturing October 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 5.88% |  |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 1,163,138 | 1,259,840 |  |
Debt Instrument, Unamortized Premium | 2,640 | 3,413 |  |
Unamortized debt issuance costs | (14,336) | (14,800) |  |
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 0 | 321,393 |  |
Debt instrument stated interest rate (percent) | 5.75% |  |  |
Senior Notes | 8 3/4% Senior Notes Maturing March 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 500,000 | 500,000 |  |
Debt instrument stated interest rate (percent) | 8.75% |  |  |
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 24,834 | 199,834 |  |
Debt instrument stated interest rate (percent) | 7.25% |  |  |
Senior Notes | 6 3/4% Senior Notes Maturing March of 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 250,000 | 250,000 |  |
Debt instrument stated interest rate (percent) | 6.75% |  | 6.75% |
Senior Notes | 5 7/8% Senior Notes Maturing October 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 400,000 | 0 |  |
Debt instrument stated interest rate (percent) | 5.875% |  |  |
Junior Subordinated Notes (net of unamortized accretion of $36,770 and $38,837, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 64,003 | 61,937 |  |
Debt instrument stated interest rate (percent) |  |  |  | 7.987%
Other Secured Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 4,113 | $ 5,635 |  |

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