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Fresh Start Accounting - Changes In Cash And Cash Equivalents (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Sep. 29, 2025	Dec. 28, 2025	Sep. 29, 2025	Dec. 29, 2024	Jun. 29, 2025	Jun. 30, 2024
Reorganization, Chapter 11 [Line Items]
Proceeds from issuance of 2L Convertible Notes through the rights offering	$ 275.0	$ 0.0	$ 275.0	$ 0.0
Payment of Existing Senior Secured Notes (principal and pre-petition accrued interest)	(308.5)
Payment of Existing Senior Secured Notes commitment fees	(15.5)	0.0	(15.5)	0.0
Payments For Reserve Cash In 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	$ 1,028.8	481.0	$ 614.0	$ 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
Payments For Reserve Cash In Escrow	(10.0)
Cash and cash equivalents (includes restricted cash)	$ (90.6)		$ (90.6)