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

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Borrowings - Schedule of Long-term Debt (Details) - USD ($)	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2019	Oct. 31, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Total outstanding borrowings of unconsolidated entities	$ 1,049,078,000	$ 1,054,030,000
Unamortized debt issuance costs	$ (7,752,000)	(8,983,000)
6.750% \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	6.75%				6.75%
5.875% \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	5.875%			5.875%
7.250% \| 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
Total outstanding borrowings of unconsolidated entities	977,325,000	983,827,000
Unamortized debt issuance costs	(7,752,000)	(8,983,000)
Senior Notes \| 6.750%
Debt Instrument [Line Items]
Total outstanding borrowings of unconsolidated entities	227,822,000	229,555,000
Senior Notes \| 5.875%
Debt Instrument [Line Items]
Total outstanding borrowings of unconsolidated entities	357,255,000	363,255,000
Senior Notes \| 7.250%
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	$ 71,753,000	$ 70,203,000