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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Total outstanding borrowings of unconsolidated entities	$ 1,143,173	$ 1,025,349
Unamortized debt issuance costs	(7,036)	(8,310)
Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Senior Unsecured Revolving Credit Facility	115,000	0
Senior Notes
Debt Instrument [Line Items]
Total outstanding borrowings of unconsolidated entities	950,219	948,945
Unamortized debt issuance costs	$ (7,036)	$ (8,310)
Senior Notes | 5.875%
Debt Instrument [Line Items]
Stated interest rate on debt instrument	5.875%	5.875%
Total outstanding borrowings of unconsolidated entities	$ 357,255	$ 357,255
Senior Notes | 7.250%
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.25%	7.25%
Total outstanding borrowings of unconsolidated entities	$ 350,000	$ 350,000
Senior Notes | 7.500%
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.50%	7.50%
Total outstanding borrowings of unconsolidated entities	$ 250,000	$ 250,000
Junior Subordinated Notes
Debt Instrument [Line Items]
Unamortized accretion	22,819	24,369
Total outstanding borrowings of unconsolidated entities	$ 77,954	$ 76,404

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Contractual interest rate for funds borrowed, under the debt agreement.

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