Borrowings - Schedule of Long-term Debt (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Total debt, net	$ 1,025,349,000	$ 978,028,000
Unamortized debt issuance costs	(8,310,000)	(5,759,000)
Revolving Credit Facility
Debt Instrument [Line Items]
Secured Revolving Credit Facility	0	0
Senior Notes
Debt Instrument [Line Items]
Total debt, net	948,945,000	903,691,000
Unamortized debt issuance costs	(8,310,000)	(5,759,000)
Junior Subordinated Notes
Debt Instrument [Line Items]
Total debt, net	76,404,000	74,337,000
Unamortized discount	$ 24,369,000	$ 26,436,000
6.750% Senior Notes (2025 Notes) \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	6.75%	6.75%
Total debt, net	$ 0	$ 202,195,000
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	$ 357,255,000	$ 357,255,000
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	$ 350,000,000	$ 350,000,000
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	$ 250,000,000	$ 0
Junior Subordinated Notes
Debt Instrument [Line Items]
Unamortized discount	$ 24,400,000

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

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