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Defined Benefit Plans - Obligations and Funded Status (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2023
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Change in the Projected Benefit Obligation (PBO):        
Actuarial gain   $ 18.3 $ (0.5) $ (1.2)
Change in Plan Assets:        
Settlements $ (2.0)      
Ending balance   177.1    
Pension Benefits [Member]        
Change in the Projected Benefit Obligation (PBO):        
Projected benefit obligation at beginning of year   509.7 543.6  
Service cost   0.0 0.1  
Interest cost   22.2 27.2  
Actuarial gain   (23.9) (0.5)  
Benefits paid   (34.9) (60.7)  
Settlements   (266.6) 0.0  
Projected benefit obligation at end of year 509.7 206.5 509.7 543.6
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases) 509.7 206.5 509.7  
Change in Plan Assets:        
Beginning balance   468.0 482.5  
Actual return on plan assets   9.1 40.5  
Employer contributions   1.5 5.7  
Benefits paid   (34.9) (60.7)  
Settlements   (266.6) 0.0  
Ending balance 468.0 177.1 468.0 482.5
Funded status (Fair value of plan assets less PBO) (41.7) (29.4) (41.7)  
Postretirement Benefits [Member]        
Change in the Projected Benefit Obligation (PBO):        
Projected benefit obligation at beginning of year   8.0 9.0  
Service cost   0.4 0.4  
Interest cost   0.5 0.5  
Actuarial gain   (0.4) (1.3)  
Benefits paid   (2.8) (0.6)  
Settlements   (0.1) 0.0  
Projected benefit obligation at end of year 8.0 5.6 8.0 $ 9.0
Change in Plan Assets:        
Employer contributions   1.2 0.6  
Benefits paid   (1.2) (0.6)  
Settlements   0.0 0.0  
Funded status (Fair value of plan assets less PBO) $ (8.0) $ (5.6) $ (8.0)