v3.25.2
Pension, Retiree Medical and Savings Plans Pension, Retiree Medical and Savings Plans (Target Asset Allocations) (Details)
Dec. 27, 2025
Dec. 28, 2024
Fixed Income    
Target Asset Allocation [Line Items]    
Target investment allocation percentage   55.00%
U.S. Equity    
Target Asset Allocation [Line Items]    
Target investment allocation percentage   22.00%
International Equity    
Target Asset Allocation [Line Items]    
Target investment allocation percentage   19.00%
Real Estate Funds [Member]    
Target Asset Allocation [Line Items]    
Target investment allocation percentage   4.00%
Forecast [Member] | Fixed Income    
Target Asset Allocation [Line Items]    
Target investment allocation percentage 56.00%  
Forecast [Member] | U.S. Equity    
Target Asset Allocation [Line Items]    
Target investment allocation percentage 22.00%  
Forecast [Member] | International Equity    
Target Asset Allocation [Line Items]    
Target investment allocation percentage 18.00%  
Forecast [Member] | Real Estate Funds [Member]    
Target Asset Allocation [Line Items]    
Target investment allocation percentage 4.00%