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Borrowings - Schedule of Long-term Debt (Details) - USD ($) | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (9,980,000) | $ (10,891,000)
Total outstanding borrowings of unconsolidated entities | 1,123,001,000 | 1,130,801,000
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Revolving Credit Facility | 0 | 0
Senior Notes |  |
Debt Instrument [Line Items] |  |
Senior Unsecured Term Loan (Term Loan) | 100,000,000 | 100,000,000
Unamortized debt issuance costs | (9,979,000) | (10,891,000)
Total outstanding borrowings of unconsolidated entities | 1,053,831,000 | 1,062,664,000
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 | 384,255,000 | 394,000,000
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 | $ 69,170,000 | $ 68,137,000

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