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Benefit Plans - Expected Weighted Average Long-Term Rate of Return (Detail)
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2019 100.00%  
Percentage of Plan Assets at Fiscal Year-End 100.00% 100.00%
Weighted Average Expected Long-Term Rate of Return - 2018 [1] 5.00%  
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2019 65.00%  
Percentage of Plan Assets at Fiscal Year-End 64.00% 39.00%
Weighted Average Expected Long-Term Rate of Return - 2018 [1] 2.50%  
U.S. Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2019 25.00%  
Percentage of Plan Assets at Fiscal Year-End 25.00% 46.00%
Weighted Average Expected Long-Term Rate of Return - 2018 [1] 1.80%  
International Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2019 10.00%  
Percentage of Plan Assets at Fiscal Year-End 9.00% 15.00%
Weighted Average Expected Long-Term Rate of Return - 2018 [1] 0.70%  
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 2019 0.00%  
Percentage of Plan Assets at Fiscal Year-End 2.00% 0.00%
Weighted Average Expected Long-Term Rate of Return - 2018 [1] 0.00%  
[1] The weighted average expected long-term rate of return of plan assets is 5.0% for the Primary Plan and 5.25% for the Bargaining Plan.