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Postretirement Plans (Summary Of Target Allocation By Asset Category And Fair Value Of Plan Assets) (Detail) (Voluntary Employees Beneficiary Association Plan Assets [Member], Private Equity Partnership Interests [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Voluntary Employees Beneficiary Association Plan Assets [Member] | Private Equity Partnership Interests [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance $ 3.0 $ 2.8
Unrealized gains attributable to assets held 0.2 0.2
Ending balance $ 3.2 $ 3.0