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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (8,592) | $ (8,983)
Total outstanding borrowings of unconsolidated entities | 1,054,938 | 1,054,030
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Revolving Credit Facility | 0 | 0
Senior Notes |  |
Debt Instrument [Line Items] |  |
Senior Unsecured Term Loan | 50,000 | 50,000
Unamortized debt issuance costs | (8,592) | (8,983)
Total outstanding borrowings of unconsolidated entities | 984,218 | 983,827
Senior Notes | 6 3/4% Senior Notes (2025 Notes) |  |
Debt Instrument [Line Items] |  |
Total outstanding borrowings of unconsolidated entities | 229,555 | 229,555
Senior Notes | 5 7/8% Senior Notes (2027 Notes) |  |
Debt Instrument [Line Items] |  |
Total outstanding borrowings of unconsolidated entities | 363,255 | 363,255
Senior Notes | 7 1/4% Senior Notes (2029 Notes) |  |
Debt Instrument [Line Items] |  |
Total outstanding borrowings of unconsolidated entities | 350,000 | 350,000
Junior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Total outstanding borrowings of unconsolidated entities | $ 70,720 | $ 70,203

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