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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017 | Jul. 30, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | $ (3,027) | $ (3,413) |
Unamortized debt issuance costs | (15,905) | (14,800) |
Total debt, net | 1,325,457 | 1,327,412 |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | (3,026) | (3,413) |
Unamortized debt issuance costs | (15,905) | (14,800) |
Total debt, net | $ 1,258,348 | 1,259,840 |
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 5.75% |  |
Total debt, net | $ 96,393 | $ 321,393 |
Senior Notes | 7 1/2% Senior Notes Maturing September 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 7.50% | 7.50% |
Senior Notes | 8 3/4% Senior Notes Maturing March 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 8.75% | 8.75% |
Total debt, net | $ 500,000 | $ 500,000 |
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 7.25% | 7.25% |
Total debt, net | $ 24,834 | $ 199,834 |
Senior Notes | 6 3/4% Senior Notes Maturing March of 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 6.75% | 6.75% |
Total debt, net | $ 250,000 | $ 250,000 |
Senior Notes | 5 7/8% Senior Notes Maturing October 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 5.875% | 0.00% |
Total debt, net | $ 400,000 | $ 0 |
Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) |  |  | 7.987%
Total debt, net | 62,970 | 61,937 |
Other Secured Notes payable |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, net | $ 4,139 | $ 5,635 |

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