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Borrowings - Schedule of Long-term Debt (Details) - USD ($) | Jun. 30, 2019 | Sep. 30, 2018 | Jul. 30, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | $ 2,061,000 | $ 2,640,000 |
Unamortized debt issuance costs | (12,027,000) | (14,336,000) |
Total debt, net | 1,316,367,000 | 1,231,254,000 |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | 2,061,000 | 2,640,000 |
Unamortized debt issuance costs | (12,027,000) | (14,336,000) |
Total debt, net | $ 1,143,192,000 | 1,163,138,000 |
Senior Notes | 8 3/4% Senior Notes Maturing March 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 8.75% |  |
Total debt, net | $ 500,000,000 | 500,000,000 |
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 7.25% |  |
Total debt, net | $ 23,603,000 | 24,834,000 |
Senior Notes | 6 3/4% Senior Notes Maturing March of 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 6.75% |  |
Total debt, net | $ 229,555,000 | 250,000,000 |
Senior Notes | 5 7/8% Senior Notes Maturing October 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 5.875% |  |
Total debt, net | $ 400,000,000 | 400,000,000 |
Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized accretion | 35,220,000 | 36,770,000 |
Stated interest rate on debt instrument (percent) |  |  | 7.987%
Total debt, net | 65,553,000 | 64,003,000 |
Other Secured Notes payable |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, net | 2,622,000 | 4,113,000 |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving Credit Facility | $ 105,000,000 | $ 0 |

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