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Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets with Finite Useful Lives (Details) - USD ($)
$ in Thousands
Sep. 28, 2025
Dec. 29, 2024
Dec. 31, 2023
Schedule of Other Intangible Assets with Finite Useful Lives [Line Items]      
Gross Carrying Amount   $ 18,100  
Accumulated Amortization   (715)  
Net Book Value $ 38,956 17,385
Trademark – Blue Raven Solar [Member]      
Schedule of Other Intangible Assets with Finite Useful Lives [Line Items]      
Gross Carrying Amount   8,400  
Accumulated Amortization   (210)  
Net Book Value   8,190  
Trademark – SunPower [Member]      
Schedule of Other Intangible Assets with Finite Useful Lives [Line Items]      
Gross Carrying Amount   5,200  
Accumulated Amortization   (130)  
Net Book Value   5,070  
Developed technology [Member]      
Schedule of Other Intangible Assets with Finite Useful Lives [Line Items]      
Gross Carrying Amount   4,500  
Accumulated Amortization   (375)  
Net Book Value   $ 4,125