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Segment Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
USD ($)
Sep. 29, 2024
USD ($)
Sep. 28, 2025
USD ($)
segments
Sep. 29, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 29, 2024
USD ($)
segments
Dec. 31, 2023
USD ($)
Segment Information [Line items]              
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]     Chief Executive Officer        
Description of segment information     The CODM evaluates the performance of these reportable segments and allocates resources to make operating decisions based on certain financial information, including segmented internal income/(loss) prepared on a basis consistent with U.S. GAAP. The measurement criteria is based on their operating revenue and operating income (loss) and excluding any corporate costs which are not allocatable to the operating segments.        
Depreciation Depreciation and amortization expenseand amortization expense     $ 4,293,000 $ 991,000 $ 2,736,000   $ 930,000
Residential Solar Installation [Member]              
Segment Information [Line items]              
Reportable segments (in segments) | segments           2  
Depreciation Depreciation and amortization expenseand amortization expense $ 1,000,000         $ 2,600,000 $ 900,000
New Homes Business [Member]              
Segment Information [Line items]              
Depreciation Depreciation and amortization expenseand amortization expense 300,000   900,000     $ 100,000  
New Homes Business One [Member]              
Segment Information [Line items]              
Depreciation Depreciation and amortization expenseand amortization expense $ 0   $ 0        
Residential Solar Installation [Member]              
Segment Information [Line items]              
Reportable segments (in segments) | segments     3        
Depreciation Depreciation and amortization expenseand amortization expense   $ 300,000 $ 3,400,000 $ 1,000,000