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Assets and Liabilities, at Fair Value - Narrative (Details) - USD ($)	Jul. 08, 2025	Jun. 30, 2025	Sep. 30, 2024	Mar. 01, 2024
Senior Secured Notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value		$ 543,900,000	$ 543,100,000
Senior Secured Notes due 2031 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage				7.875%
Debt instrument, face amount				$ 550,000,000
Senior Secured Notes due 2031 | Senior Notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value		$ 576,500,000
Senior Secured Notes due 2032 | Senior Notes | R.J. O’Brien | Subsequent Event
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage	6.875%
Debt instrument, face amount	$ 625,000,000

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