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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016 | Jul. 30, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | $ (3,799) | $ (1,482) |
Debt issuance costs | 15,709 | 15,514 |
Total debt, net | 1,334,362 | 1,331,878 |
5 3/4% Senior Notes Maturing June 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, net | 321,393 |  |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt premium, net | (3,799) | (2,362) |
Debt issuance costs | 16,478 | 14,063 |
Total debt, net | $ 1,258,548 | $ 1,207,526 |
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 5.75% | 5.75% |
Total debt, net |  | $ 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% |
Total debt, net | $ 0 | $ 198,000 |
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 | $ 199,834 | $ 199,834 |
Senior Notes | 6 3/4% Senior Notes Maturing March 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) | 6.75% | 6.75% |
Total debt, net | $ 250,000 | $ 0 |
Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, net | 0 | 52,669 |
Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate on debt instrument (percent) |  |  | 7.987%
Total debt, net | 60,903 | 59,870 |
Other Secured Notes payable |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, net | $ 14,911 | $ 11,813 |

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