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Organization (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jul. 17, 2024
Oct. 31, 2023
Jul. 31, 2023
Mar. 31, 2023
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 31, 2024
Dec. 29, 2024
Dec. 31, 2023
Organization [Line Items]                        
Date of incorporation               Feb. 22, 2010     Feb. 22, 2010  
Loss from continuing operations           $ (15,804) $ (77,958) $ (30,099) $ (101,433) $ (54,444) $ (54,444) $ (96,197)
Accumulated deficit           (442,578)   (442,578)     (411,379) $ (354,928)
Current debt           204,300   204,300     $ 1,500  
Restricted cash           $ 5,100   $ 5,100        
Shares of complete solaria common stock           153,884,960   153,884,960     116,906,160 45,891,467
Purchase price per share                     $ 10  
Excess of gross proceeds                       $ 5,000
Originally issued shares   2,450,000                    
Acquisition of assets consideration $ 54,500                      
Net cash acquired, $ 1                      
Net loss from discontinued operations           $ (1,100) $ (1,100) (2,007) (2,007) $ (2,007) (173,358)
Net loss           (16,904) $ (77,958) (31,199) $ (103,440) $ (56,451) (56,451) (269,555)
Cash and cash equivalents           $ 5,072   $ 5,072     $ 13,378 2,593
PIPE Investors [Member]                        
Organization [Line Items]                        
Shares acquired                     1,570,000  
Aggregate purchase price                     $ 15,700  
Additional shares issued                     60,000  
Subscription Agreements [Member]                        
Organization [Line Items]                        
Excess of gross proceeds                     $ 3,500  
New Money PIPE Investors [Member]                        
Organization [Line Items]                        
Shares acquired                     120,000  
Purchase price per share                     $ 5  
Aggregate purchase price                     $ 600  
New Money PIPE Subscription Agreement [Member]                        
Organization [Line Items]                        
Additional shares issued                     60,000  
Complete Solaria Common Stock [Member]                        
Organization [Line Items]                        
Shares of complete solaria common stock                     25,494,332  
Additional shares issued                     193,976  
Complete Solaria Common Stock [Member] | Sponsor [Member]                        
Organization [Line Items]                        
Additional shares issued                     150,000  
Class A Ordinary Shares [Member]                        
Organization [Line Items]                        
Shares of complete solaria common stock       6,300,000                
Purchased shares       1,161,512                
Shares exercised         34,500,000              
Right to redeem shares         7,784,739              
Converted shares         1              
Class A Ordinary Shares [Member] | FACT [Member]                        
Organization [Line Items]                        
Originally issued shares         23,256,504              
Class A Ordinary Shares [Member] | FACT Investors [Member]                        
Organization [Line Items]                        
Remaining shares outstanding         11,243,496              
Class B Ordinary Share [Member]                        
Organization [Line Items]                        
Converted shares                     1  
Maxeon Ordinary Shares [Member]                        
Organization [Line Items]                        
Loss from continuing operations                       4,200
Shares acquired     1,100,000                  
Aggregate purchase price     $ 11,000                  
Common Stock [Member]                        
Organization [Line Items]                        
Excess of gross proceeds                      
Originally issued shares           4,333,334 2,718,837 4,333,334 2,718,837   2,918,837  
Shares exercised           198,096 282,966 731,671 373,003   398,883 67,533
Right to redeem shares                       13,458,293
Net loss            
Common Stock [Member] | Complete Solaria Common Stock [Member]                        
Organization [Line Items]                        
Aggregate of shares       420,000                
Common Stock [Member] | Class A Ordinary Shares [Member]                        
Organization [Line Items]                        
Redemption amount         $ 82,200