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Plan Asset and Target Asset Allocations (Detail)
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
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 2013, Minimum 40.00%  
Target Allocation 2013, Maximum 60.00%  
Percentage of Plan Assets at the Measurement Date 56.60% 56.40%
Fixed Income Securities
    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2013, Minimum 10.00%  
Target Allocation 2013, Maximum 40.00%  
Percentage of Plan Assets at the Measurement Date 9.60% 8.40%
Real Estate Funds
    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2013, Minimum 0.00%  
Target Allocation 2013, Maximum 25.00%  
Percentage of Plan Assets at the Measurement Date 3.10% 3.90%
Other Diversifying Strategies
    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2013, Minimum 0.00% [1]  
Target Allocation 2013, Maximum 40.00% [1]  
Percentage of Plan Assets at the Measurement Date 29.80% [1] 29.10% [1]
Short Term Investments And Cash
    
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]    
Target Allocation 2013, Minimum 0.00%  
Target Allocation 2013, Maximum 25.00%  
Percentage of Plan Assets at the Measurement Date 0.90% 2.20%
[1] Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.