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Fresh Start Accounting - Issuance of New Common Stock and Additional Paid-in Capital (Details) - USD ($) $ in Millions	Sep. 29, 2025	Dec. 28, 2025	Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]
Capped call transactions related to the issuance of convertible notes due December 1, 2029	$ 168.8
Contingent Shares (Unissued)	19.2
Common stock		$ 0.0	$ 0.2
Additional paid-in-capital		$ 777.6	$ 4,094.1
Additional Paid-in Capital
Reorganization, Chapter 11 [Line Items]
Capped call transactions related to the issuance of convertible notes due December 1, 2029	168.8
Contingent Shares (Unissued)	19.2
Reorganization, Sucessor
Reorganization, Chapter 11 [Line Items]
Common stock	0.0
Additional paid-in-capital	757.1
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Issuance of Wolfspeed, Inc. common stock, at par, and additional paid-in capital to holders of convertible notes claims	540.3
Common stock	(0.2)
Additional paid-in-capital	(4,103.6)
Reorganization Adjustments \| Common Stock
Reorganization, Chapter 11 [Line Items]
Issuance of Wolfspeed, Inc. common stock, at par, and additional paid-in capital to existing equity holders	0.0
Issuance of Wolfspeed, Inc. common stock, at par, and additional paid-in capital to holders of convertible notes claims	0.0
Capped call transactions related to the issuance of convertible notes due December 1, 2029	0.0
Contingent Shares (Unissued)	0.0
Reorganization Adjustments \| Additional Paid-in Capital
Reorganization, Chapter 11 [Line Items]
Issuance of Wolfspeed, Inc. common stock, at par, and additional paid-in capital to existing equity holders	28.8
Issuance of Wolfspeed, Inc. common stock, at par, and additional paid-in capital to holders of convertible notes claims	540.3
Capped call transactions related to the issuance of convertible notes due December 1, 2029	168.8
Contingent Shares (Unissued)	19.2
Reorganization Adjustments \| Reorganization, Sucessor
Reorganization, Chapter 11 [Line Items]
Common stock	0.0
Additional paid-in-capital	$ 757.1