v3.26.1
Fresh Start Accounting - Issuance of New Common Stock and Additional Paid-in Capital (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 29, 2025
Sep. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]        
Issuance of Additional paid-in capital for equity-classified premium for New 2L Non-Renesas Convertible Notes   $ 168.8    
Obligation to issue Contingent Shares to existing equity holders, at the implied value   19.2    
Common stock     $ 0.1 $ 0.2
Additional paid-in-capital     $ 1,345.9 $ 4,094.1
Reorganization, Sucessor        
Reorganization, Chapter 11 [Line Items]        
Common stock $ 0.0 0.0    
Additional paid-in-capital 757.1 757.1    
Additional Paid-in Capital        
Reorganization, Chapter 11 [Line Items]        
Issuance of Additional paid-in capital for equity-classified premium for New 2L Non-Renesas Convertible Notes 168.8 168.8    
Obligation to issue Contingent Shares to existing equity holders, at the implied value   19.2    
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) (0.2)    
Additional paid-in-capital (4,103.6) (4,103.6)    
Reorganization Adjustments | Reorganization, Sucessor        
Reorganization, Chapter 11 [Line Items]        
Common stock 0.0 0.0    
Additional paid-in-capital 757.1 $ 757.1    
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      
Issuance of Additional paid-in capital for equity-classified premium for New 2L Non-Renesas Convertible Notes 0.0      
Obligation to issue Contingent Shares to existing equity holders, at the implied value 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      
Issuance of Additional paid-in capital for equity-classified premium for New 2L Non-Renesas Convertible Notes 168.8      
Obligation to issue Contingent Shares to existing equity holders, at the implied value $ 19.2