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Fresh Start Accounting - Changes In Cash And Cash Equivalents (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 29, 2025	Sep. 29, 2025	Mar. 29, 2026	Mar. 30, 2025	Jun. 29, 2025	Jun. 30, 2024
Reorganization, Chapter 11 [Line Items]
Proceeds from issuance of 2L Convertible Notes through the rights offering	$ 275.0
Payment of Existing Senior Secured Notes (principal and pre-petition accrued interest)	(308.5)
Payment of Existing Senior Secured Notes commitment fees	(15.5)	$ (15.5)	$ 0.0	$ 0.0
Payment of Contingent Cash into escrow	(10.0)
Payment of lender professional and success fees, including deferred financing costs	(31.6)
Cash and cash equivalents (includes restricted cash)	481.0	481.0	$ 695.1	$ 730.2	$ 467.2	$ 1,045.9
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Proceeds from issuance of 2L Convertible Notes through the rights offering	275.0
Payment of Contingent Cash into escrow	(10.0)
Cash and cash equivalents (includes restricted cash)	$ (90.6)	$ (90.6)