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Fresh Start Accounting - Issuance of Renesas 2L Convertible Notes and 2l Non-Renesas Convertible Notes (Details) - USD ($) $ in Millions	Dec. 28, 2025	Sep. 29, 2025	Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]
Issuance of debt	$ 2,090.6		$ 6,325.0
Less: Debt issuance costs		$ (8.0)
Convertible notes, net	$ 533.5	539.7	$ 0.0
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Convertible notes, net		539.7
New 2L Non-Renesas Convertible Notes \| Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Issuance of debt		331.4
New 2L Renesas Convertible Notes \| Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Issuance of debt		216.3
2L Convertible Notes \| Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Less: Debt issuance costs		$ (8.0)