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Summary of Significant Accounting Policies - Schedule of Revenue Recognized (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
 [1]
Sep. 29, 2024
 [1]
Sep. 28, 2025
 [1]
Sep. 29, 2024
 [1]
Dec. 29, 2024
Dec. 31, 2023
Schedule of Revenue Recognized [Line Items]            
Total revenue $ 70,005 $ 5,536 $ 220,269 $ 20,068 $ 108,742 $ 87,616
Residential Solar Installations [Member]            
Schedule of Revenue Recognized [Line Items]            
Total revenue         67,460 87,616
Residential Solar Installations [Member] | Revenue Recognized Over Time [Member]            
Schedule of Revenue Recognized [Line Items]            
Total revenue         67,460 84,858
Residential Solar Installations [Member] | Revenue Recognized at a Point in Time [Member]            
Schedule of Revenue Recognized [Line Items]            
Total revenue         2,758
New Homes Business [Member]            
Schedule of Revenue Recognized [Line Items]            
Total revenue         41,282
New Homes Business [Member] | Revenue Recognized Over Time [Member]            
Schedule of Revenue Recognized [Line Items]            
Total revenue         32,205
New Homes Business [Member] | Revenue Recognized at a Point in Time [Member]            
Schedule of Revenue Recognized [Line Items]            
Total revenue         $ 9,077
[1] Revenue is net of dealer fees attributable to related party of $0.3 million and $1.6 million in the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Revenue is net of dealer fees attributable to related party of $1.6 million in each of the thirteen and thirty-nine week periods ended September 29, 2024. Refer to Note 16 – Related Party Transactions for details.