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Postretirement Plans (Summary Of Weighted-Average Assumptions Used To Determine Projected Benefit Obligation) (Detail)
Dec. 29, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.30% 4.50%
U.S. Postretirement Health Care Plans [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.20% 3.80%