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Plan Asset and Target Asset Allocations (Detail)
Dec. 30, 2017
Dec. 31, 2016
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Percentage of Plan Assets at the Measurement Date 100.00% 100.00%
Equity Securities    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Percentage of Plan Assets at the Measurement Date 38.60% 51.10%
Equity Securities | Minimum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 15.00%  
Equity Securities | Maximum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 45.00%  
Fixed Income Securities    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Percentage of Plan Assets at the Measurement Date 27.10% 9.30%
Fixed Income Securities | Minimum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 25.00%  
Fixed Income Securities | Maximum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 45.00%  
Real Estate Funds    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Percentage of Plan Assets at the Measurement Date   5.20%
Other Diversifying Strategies    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Percentage of Plan Assets at the Measurement Date [1] 28.80% 33.50%
Other Diversifying Strategies | Minimum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 [1] 0.00%  
Other Diversifying Strategies | Maximum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 [1] 40.00%  
Short Term Investments And Cash    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Percentage of Plan Assets at the Measurement Date 5.50% 0.90%
Short Term Investments And Cash | Minimum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 0.00%  
Short Term Investments And Cash | Maximum    
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2018 10.00%  
[1] Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.