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Defined Benefit Plans - Assumed Health Care Cost Trend Rates Used to Determine Benefit Obligations and Net Cost (Detail) - Postretirement Benefits [Member]
 12 Months Ended
Dec. 27, 2025
Dec. 28, 2024
Defined Benefit Plan Disclosure [Line Items]    
Rate that the cost trend rate is assumed to decline (the ultimate trend rate) 4.50% 4.50%
Year that the rate reaches the ultimate trend rate 2035 2035
Rate that the cost trend rate is assumed to decline (the ultimate trend rate) 4.50% 4.50%
Year that the rate reaches the ultimate trend rate 2035 2033
Pre Age Sixty Five    
Defined Benefit Plan Disclosure [Line Items]    
Health care cost trend rate assumed for next year [1] 6.90% 7.10%
Health care cost trend rate assumed for next year [1] 7.10% 7.30%
Post Age Sixty Five    
Defined Benefit Plan Disclosure [Line Items]    
Health care cost trend rate assumed for next year [1] 7.40% 7.50%
Health care cost trend rate assumed for next year [1] 7.50% 6.90%
[1] The pre-65 initial health care cost trend rate is shown first / followed by the post-65 rate