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Defined Benefit Plans - Amounts in Accumulated Other Comprehensive loss that have not yet been Recognized as Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 28, 2024
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Recognition of actuarial gain   $ 0.0 $ (18.3) $ 0.5
Recognition actuarial loss due to settlement $ 19.0      
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Recognition of actuarial gain   8.8 23.9  
Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Recognition of actuarial gain   0.3 0.4  
Other Accumulated Other Comprehensive Income | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Beginning Balance   12.8 35.2  
Recognition of actuarial gain   0.0 0.5  
Current year actuarial (gain)   (0.7) (3.9)  
Recognition actuarial loss due to settlement   0.0 (19.0)  
Ending Balance 12.8 12.1 12.8 35.2
Other Accumulated Other Comprehensive Income | Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Beginning Balance   (0.5) 0.6  
Recognition of actuarial gain   0.3 0.3  
Current year actuarial (gain)   (0.3) (1.4)  
Recognition actuarial loss due to settlement   0.0 0.0  
Ending Balance $ (0.5) $ (0.5) $ (0.5) $ 0.6