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Segment Information - Schedule of Financial Performance through Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 29, 2024
Dec. 31, 2023
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues $ 70,005 [1] $ 5,536 [1] $ 220,269 [1] $ 20,068 [1] $ 108,742 $ 87,616
Less:            
Cost of revenues 37,965 8,693 126,970 21,834 69,240 69,828
Sales commissions 7,534 7,270 24,273 11,691 24,590 31,127
Sales and marketing       3,762    
General and administrative [2]       29,789    
Operating (loss) income from continuing operations (3,444) (29,970) (5,120) (47,008) (68,509) (52,358)
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense       (8,230)    
Interest income 86 3 102 19 36
Other expense, net (4,256) [3] (65,684) [3] (1,724) [3] (66,234) [3] 7,932 [4] (29,862) [4]
Gain on extinguishment of debt 19,948 19,948    
(Loss) from continuing operations before income taxes (15,804) (77,958) (30,099) (101,422) (54,444) (96,217)
Residential Solar Installation [Member]            
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues         67,460 87,616
Less:            
Sales commissions         23,388 31,127
Sales and marketing         6,827 6,920
Operating (loss) income from continuing operations         (17,826) (52,358)
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense        
Interest income        
Other expense, net        
(Loss) from continuing operations before income taxes        
New Homes Business [Member]            
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues         41,282
Less:            
Sales commissions         1,202
Sales and marketing        
Operating (loss) income from continuing operations         12,874
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense        
Interest income        
Other expense, net        
(Loss) from continuing operations before income taxes        
Reportable Segment [Member]            
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues 70,005 5,536 220,269      
Less:            
Cost of revenues 37,965 8,693 126,970      
Sales commissions 7,534 7,270 24,273      
Sales and marketing 6,467 1,093 21,764      
General and administrative 21,483 [5] 18,450 [5] 52,382 [2]      
Operating (loss) income from continuing operations (3,444) (29,970) (5,120)      
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense (8,104) (2,338) (23,258)      
Interest income 86 3      
Other expense, net (4,256) (65,684) (1,724)      
Gain on extinguishment of debt 19,948      
(Loss) from continuing operations before income taxes (15,804) (77,958) (30,099)      
Reportable Segment [Member] | Residential Solar Installation [Member]            
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues 38,579 5,536 114,097 20,068    
Less:            
Cost of revenues 20,984 8,693 67,388 21,834    
Sales commissions 7,479 7,270 22,882 11,691    
Sales and marketing 4,781 1,093 19,591 3,762    
General and administrative 12,240 [5] 18,450 [5] 32,782 [2] 29,789 [2]    
Operating (loss) income from continuing operations (6,905) (29,970) (28,546) (47,008)    
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense        
Interest income        
Other expense, net        
Gain on extinguishment of debt        
Reportable Segment [Member] | New Homes Business [Member]            
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues 27,116 101,862    
Less:            
Cost of revenues 13,329 55,930    
Sales commissions 55 1,391    
Sales and marketing 1,686 2,173    
General and administrative 9,243 [5] [5] 19,600 [2] [2]    
Operating (loss) income from continuing operations 2,803 22,768    
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense    
Interest income    
Other expense, net    
Gain on extinguishment of debt    
(Loss) from continuing operations before income taxes        
Reportable Segment [Member] | Sunder [Member]            
Schedule of Financial Performance through Reportable Segments [Line Items]            
Operating revenues 4,310 4,310    
Less:            
Cost of revenues 3,652 3,652    
Sales commissions    
Sales and marketing    
General and administrative [5] [5] [2] [2]    
Operating (loss) income from continuing operations 658 658    
Reconciliation of segment (loss) income from continuing operations before income taxes:            
Interest expense    
Interest income    
Other expense, net    
Gain on extinguishment of debt        
(Loss) from continuing operations before income taxes        
[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.
[2] In the thirty-nine weeks ended September 28, 2025, depreciation and amortization expense was $3.4 million, $0.9 million and zero for the Residential Solar Installation, New Homes Business and Sunder reportable segments, respectively. In the thirty-nine weeks ended September 29, 2024, depreciation and amortization expense was $1.0 million for the Residential Solar Installation reportable segment.
[3] Includes the following related party transactions (in millions):
[4] Includes related party interest expense and amortization of debt issuance costs of $1.8 million and $1.5 million in the thirteen week periods ended September 28, 2025, and September 29, 2024, respectively. Includes related party interest expense and amortization of debt issuance costs of $5.4 million and $5.6 million in the thirty-nine weeks periods ended September 28, 2025, and September 29, 2024, respectively.
[5] For the thirteen weeks ended September 28, 2025, depreciation and amortization expense was $1.0 million,  $0.3 million, and zero for the Residential Solar Installation, New Homes Business and Sunder reportable segments, respectively. For the thirteen weeks ended September 29, 2024, depreciation and amortization expense was $0.3 million for the Residential Solar Installation reportable segment.