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Defined Benefit Plans - Reconciliation of Level Three Measurements (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 27, 2025
Dec. 28, 2024
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance $ 177.1  
Ending balance 188.3 $ 177.1
Group annuity/insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance 0.0 26.8
Purchases 139.3 0.0
Losses on assets during the period 0.0 (0.6)
Sale/Settlement 0.0 (26.2)
Ending balance $ 139.3 $ 0.0