Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Total debt, net	$ 1,029,114	$ 1,025,349
Unamortized debt issuance costs	(6,611)	(8,310)
Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Senior Unsecured Revolving Credit Facility	0	0
Senior Notes
Debt Instrument [Line Items]
Total debt, net	950,644	948,945
Unamortized debt issuance costs	(6,611)	(8,310)
Junior Subordinated Notes
Debt Instrument [Line Items]
Total debt, net	78,470	76,404
Unamortized discount	$ 22,303	$ 24,369
5.875% Senior Notes (2027 Notes) \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	5.875%	5.875%
Total debt, net	$ 357,255	$ 357,255
7.250% Senior Notes (2029 Notes) \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.25%	7.25%
Total debt, net	$ 350,000	$ 350,000
7.500% Senior Notes (2031 Notes) \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.50%	7.50%
Total debt, net	$ 250,000	$ 250,000

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

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