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Benefits Expected to be Paid from Plans Assets (Parenthetical) (Detail) - Includes Plan No 1 and No 2 Single Lump Sum - USD ($)
$ in Millions
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Lump Sums Plan No. 1      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Distributions from existing plan assets     $ 24.9
Lump Sums Plan No. 1      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Distributions from existing plan assets   $ 7.0  
Lump Sums Plan No. 1      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Distributions from existing plan assets $ 104.5    
Lump Sums Plan No. 2      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Distributions from existing plan assets     $ 1.5
Lump Sums Plan No. 2      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Distributions from existing plan assets   $ 0.7  
Lump Sums Plan No. 2      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Distributions from existing plan assets $ 0.4