The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ Details

Assets and Liabilities, at Fair Value - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2026	Sep. 30, 2025	Jul. 08, 2025	Mar. 01, 2024
Senior Secured Notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value	$ 544.9	$ 544.1
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%			7.875%
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	$ 576.7
Senior Secured Notes due 2032
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value	$ 616.0	$ 614.9
Senior Secured Notes due 2032 \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage	6.875%		6.875%
Senior Secured Notes due 2032 \| Senior Notes \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 642.2