v3.25.4

Fresh Start Accounting - Settlement of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Sep. 29, 2025	Dec. 28, 2025	Sep. 29, 2025	Dec. 29, 2024	Dec. 29, 2024	Dec. 29, 2024	Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]
Liabilities subject to compromise	$ 0.0		$ 0.0
Current portion of finance lease liabilities(5)	(0.6)	$ (0.5)	(0.6)				$ (0.5)
Finance lease liabilities, less current portion(6)	(1.9)	(1.8)	(1.9)				(8.4)
Issuance of debt		(2,090.6)					(6,325.0)
Fair value issuance of New 2L Non-Renesas Convertible Notes – substantial premium (see Adjustment 12)	(168.8)		(168.8)
Proceeds from issuance of 2L Convertible Notes through the rights offering	275.0	0.0	275.0			$ 0.0
Long-term warrant	(33.6)	(34.2)	(33.6)				0.0
Less: Implied value of the Renesas Base Consideration Shares classified as a liability	(371.1)	(302.5)	(371.1)				$ 0.0
Payment of Contingent Cash into escrow	(10.0)
Gain on settlement of liabilities subject to compromise (See Adjustment 13)	3,751.8	0.0	3,751.8	$ 0.0	$ 0.0
New Senior Secured Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt		(1,259.2)
New 2L Non-Renesas Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt		(331.4)
Proceeds from issuance of 2L Convertible Notes through the rights offering	275.0
New 2L Non-Convertible Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt		(296.4)
New 2L Renesas Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt		$ (203.6)
Predecessor
Reorganization, Chapter 11 [Line Items]
Liabilities subject to compromise	7,315.3		7,315.3
Current portion of finance lease liabilities(5)	0.0		0.0
Finance lease liabilities, less current portion(6)	0.0		0.0
Long-term warrant	0.0		0.0
Less: Implied value of the Renesas Base Consideration Shares classified as a liability	0.0		0.0
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Liabilities subject to compromise	(7,315.3)		(7,315.3)
Current portion of finance lease liabilities(5)	(0.6)		(0.6)
Reinstatement of short-term operating lease liabilities and supply agreements (see Adjustment 6)	(26.1)		(26.1)
Finance lease liabilities, less current portion(6)	(8.3)		(8.3)
Reinstatement of long-term operating lease liabilities and supply agreements (see Adjustment 9)	(199.0)		(199.0)
Distribution of proceeds to holders of Senior Secured Notes (see Adjustment 1)	(324.0)		(324.0)
Proceeds from issuance of 2L Convertible Notes through the rights offering	275.0
Implied value of issuance of Wolfspeed, Inc. New Common Stock, to creditors (see Adjustment 12)	(540.3)
Long-term warrant	(33.6)		(33.6)
Less: Implied value of the Renesas Base Consideration Shares classified as a liability	(371.1)		(371.1)
Payment of Contingent Cash into escrow	(10.0)
Gain on settlement of liabilities subject to compromise (See Adjustment 13)	3,751.8
Reorganization Adjustments | Additional Paid-in Capital
Reorganization, Chapter 11 [Line Items]
Implied value of issuance of Wolfspeed, Inc. New Common Stock, to creditors (see Adjustment 12)	(540.3)
Reorganization Adjustments | New Senior Secured Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(1,379.4)		(1,379.4)
Reorganization Adjustments | New 2L Non-Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(331.4)		(331.4)
Reorganization Adjustments | New 2L Non-Renesas Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(331.4)		(331.4)
Fair value issuance of New 2L Non-Renesas Convertible Notes – substantial premium (see Adjustment 12)	(168.8)		(168.8)
Reorganization Adjustments | New 2L Non-Convertible Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(229.6)		(229.6)
Reorganization Adjustments | New 2L Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(216.3)		(216.3)
Reorganization Adjustments | New 2L Renesas Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	$ (216.3)		$ (216.3)

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