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Plan Asset and Target Asset Allocations (Detail)
12 Months Ended
Dec. 31, 2016
Jan. 02, 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]    
Target Allocation 2017, Minimum 40.00%  
Target Allocation 2017, Maximum 60.00%  
Percentage of Plan Assets at the Measurement Date 51.10% 55.60%
Fixed Income Securities    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2017, Minimum 10.00%  
Target Allocation 2017, Maximum 40.00%  
Percentage of Plan Assets at the Measurement Date 9.30% 10.00%
Real Estate Funds    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2017, Minimum 0.00%  
Target Allocation 2017, Maximum 25.00%  
Percentage of Plan Assets at the Measurement Date 5.20% 4.70%
Other Diversifying Strategies    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2017, Minimum [1] 0.00%  
Target Allocation 2017, Maximum [1] 40.00%  
Percentage of Plan Assets at the Measurement Date [1] 33.50% 28.70%
Short Term Investments And Cash    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2017, Minimum 0.00%  
Target Allocation 2017, Maximum 25.00%  
Percentage of Plan Assets at the Measurement Date 0.90% 1.00%
[1] Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.