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Borrowings - Schedule of Long-term Debt (Details) - USD ($) | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2019 | Oct. 31, 2017 | Mar. 31, 2017
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Unamortized debt issuance costs | $ (8,151,000) | $ (8,983,000) |  |  |
Total outstanding borrowings of unconsolidated entities | $ 1,049,895,000 | 1,054,030,000 |  |  |
6 3/4% Senior Notes (2025 Notes) | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt instrument | 6.75% |  |  |  | 6.75%
5 7/8% Senior Notes (2027 Notes) | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt instrument | 5.88% |  |  | 5.88% |
7 1/4% Senior Notes (2029 Notes) | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate on debt instrument | 7.25% |  | 7.25% |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving Credit Facility | $ 0 | 0 |  |  |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Unsecured Term Loan | 50,000,000 | 50,000,000 |  |  |
Unamortized debt issuance costs | (8,151,000) | (8,983,000) |  |  |
Total outstanding borrowings of unconsolidated entities | 978,659,000 | 983,827,000 |  |  |
Senior Notes | 6 3/4% Senior Notes (2025 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total outstanding borrowings of unconsolidated entities | 229,555,000 | 229,555,000 |  |  |
Senior Notes | 5 7/8% Senior Notes (2027 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total outstanding borrowings of unconsolidated entities | 357,255,000 | 363,255,000 |  |  |
Senior Notes | 7 1/4% Senior Notes (2029 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total outstanding borrowings of unconsolidated entities | 350,000,000 | 350,000,000 |  |  |
Junior Subordinated Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total outstanding borrowings of unconsolidated entities | $ 71,236,000 | $ 70,203,000 |  |  |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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