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Benefit Plans - Weighted Average Expected Long-Term Rate of Return (Detail)
12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2020 100.00%  
Percentage of Plan Assets at Fiscal Year-End 100.00% 100.00%
Weighted Average Expected Long-Term Rate of Return - 2020 [1] 5.50%  
U.S. Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2020 65.00%  
Percentage of Plan Assets at Fiscal Year-End 57.00% 64.00%
Weighted Average Expected Long-Term Rate of Return - 2020 [1] 3.30%  
U.S. Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2020 26.00%  
Percentage of Plan Assets at Fiscal Year-End 24.00% 25.00%
Weighted Average Expected Long-Term Rate of Return - 2020 [1] 1.60%  
International Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2020 0.00%  
Percentage of Plan Assets at Fiscal Year-End 8.00% 0.00%
Weighted Average Expected Long-Term Rate of Return - 2020 [1] 0.00%  
International Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2020 7.00%  
Percentage of Plan Assets at Fiscal Year-End 9.00% 9.00%
Weighted Average Expected Long-Term Rate of Return - 2020 [1] 0.50%  
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2020 2.00%  
Percentage of Plan Assets at Fiscal Year-End 2.00% 2.00%
Weighted Average Expected Long-Term Rate of Return - 2020 [1] 0.10%  
[1] The weighted average expected long-term rate of return of plan assets is 5.50% for the Primary Plan and 6.25% for the Bargaining Plan.