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Postretirement Plans (Summary Of Target Allocation And Weighted-Average Asset Allocation By Asset Category And Fair Value Of Plan Assets) (Detail) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Dec. 29, 2012 Voluntary Employees Beneficiary Association Plan Assets [Member]	Dec. 31, 2011 Voluntary Employees Beneficiary Association Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities, Target allocation				56.00%
Private equity partnerships, Target allocation				22.00%
Debt securities and cash, Target allocation				14.00%
Real estate and other real assets, Target allocation				8.00%
Total, Target allocation				100.00%
Equity securities, Actual weighted-average asset allocation				56.00%	55.00%
Private equity partnerships, Actual weighted-average asset allocation				21.00%	22.00%
Debt securities and cash, Actual weighted-average asset allocation				15.00%	16.00%
Real estate and other real assets, Actual weighted-average asset allocation				8.00%	7.00%
Total, Actual weighted-average asset allocation				100.00%	100.00%
Fair value of plan assets	$ 964.0	$ 846.1	$ 793.0	$ 15.1	$ 13.5

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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