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Benefits Expected to be Paid from Plans Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Pension plans      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Benefits paid $ 29,484 $ 23,843  
2020 368,851    
2021 2,813    
2022 2,942    
2023 2,755    
2024 2,675    
2025 – 2029 10,878    
Pension plans | Includes Plan No 1 and No 2 Single Lump Sum      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Benefits paid [1]     $ 38,776
Pension plans | Includes Plan No 1 and No 2 Single Lump Sum      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Benefits paid [2]   48,722  
Pension plans | Includes Plan No 1 and No 2 Single Lump Sum      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Benefits paid [3] 29,484    
Postretirement Benefit Plans      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Benefits paid 1,384 2,131  
Postretirement Benefit Plans | Employer Gross Contribution      
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]      
Benefits paid 722 $ 1,308 $ 376
2020 675    
2021 653    
2022 638    
2023 617    
2024 644    
2025 – 2029 $ 3,240    
[1] Includes $14.4 million and $1.6 million from Plan No. 1 and Plan No. 2, respectively, paid as lump sums.
[2] Includes $24.9 million and $1.5 million from Plan No. 1 and Plan No. 2, respectively, paid as lump sums.
[3] Includes $7.0 million and $0.7 million from Plan No. 1 and Plan No. 2, respectively, paid as lump sums.