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Credit Facilities - Narrative (Details) - USD ($)		12 Months Ended
	Jun. 17, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Mar. 01, 2024
Line of Credit Facility [Line Items]
Loss on extinguishment of debt		$ 3,700,000	$ 0	$ 0
Senior Notes
Line of Credit Facility [Line Items]
Loss on extinguishment of debt		3,700,000
Deferred debt issuance cost, writeoff		2,400,000
Deferred financing costs		$ 1,300,000
Senior Secured Notes due 2031 | Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 550,000,000
Stated interest rate (as a percent)		7.875%			7.875%
Discount rate at issuance of face value (as a percent)					100.00%
Debt issuance costs, gross					$ 7,700,000
Senior Secured Notes due 2025 | Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)	8.625%	8.625%
Repayments of long-term debt	$ 363,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility borrowing		$ 1,205,000,000
Line of credit facility, current borrowing capacity		$ 340,000,000

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