v3.25.4
Pension, Retiree Medical and Savings Plans Pension, Retiree Medical and Savings Plans (Target Asset Allocations) (Details)
Dec. 26, 2026
Dec. 27, 2025
Fixed Income    
Target Asset Allocation [Line Items]    
Target investment allocation percentage   56.00%
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   18.00%
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 58.00%  
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 16.00%  
Forecast [Member] | Real Estate Funds [Member]    
Target Asset Allocation [Line Items]    
Target investment allocation percentage 4.00%