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Fresh Start Accounting - Issuance of Renesas 2L Convertible Notes and 2l Non-Renesas Convertible Notes (Details) - USD ($) $ in Millions	Jun. 28, 2026	Sep. 29, 2025	Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]
Issuance of debt	$ 2,469.6		$ 6,325.0
Less: Debt issuance costs		$ (8.0)
Net change in convertible notes, net	$ 756.5	539.7	$ 0.0
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Net change in convertible notes, net		539.7
Reorganization Adjustments \| New 2L Non-Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt		331.4
Reorganization Adjustments \| New 2L Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt		216.3
Reorganization Adjustments \| 2L Convertible Notes
Reorganization, Chapter 11 [Line Items]
Less: Debt issuance costs		$ (8.0)