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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 28, 2025
USD ($)
agreement
Dec. 29, 2024
USD ($)
Dec. 31, 2023
USD ($)
Property, Plant and Equipment [Line Items]      
Number of agreements | agreement 2    
CCA assets $ 31,200,000 $ 29,600,000  
Accumulated depreciation 6,400,000 2,700,000  
Implementation costs 24,800,000 26,900,000  
CCA assets amortization expense $ 3,700,000 $ 2,600,000  
Amortization period 18 years 18 years  
Impairment related to long-lived assets $ 0 $ 0 $ 0
Goodwill impairment 0 0 213,992,000
Amount deductible under liability insurance policies 750,000    
Net operating losses 84,499,000 17,937,000  
Deferred tax assets, net 174,100,000 113,946,000  
Foreign income taxes $ 0    
Collective bargaining agreements, employee percentage 0.57    
Number of collective bargaining agreements | agreement 332    
Number of collective bargaining agreements expired, year one | agreement 27    
Number of collective bargaining agreements expired, year two | agreement 14    
Allocation of tax assets from Southwest Gas Holdings $ (20,861,000)    
Other Nonoperating Income (Expense)      
Property, Plant and Equipment [Line Items]      
Gain (loss) on foreign currency transaction (100,000) (100,000) $ (500,000)
CANADA      
Property, Plant and Equipment [Line Items]      
Repatriated foreign earnings 0 $ 0  
Southwest Gas Holdings      
Property, Plant and Equipment [Line Items]      
Net operating losses 55,400,000    
Deferred tax assets, net $ 23,700,000    
Minimum      
Property, Plant and Equipment [Line Items]      
Amortization period 1 year    
Maximum      
Property, Plant and Equipment [Line Items]      
Amortization period 21 years