Significant Unobservable Inputs in Estimation Of Fair Value (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012 Level 3	Dec. 29, 2012 Level 3 Real Estate Funds	Dec. 29, 2012 Level 3 Guaranteed Insurance Contracts	Dec. 29, 2012 Level 3 Hedge Funds, Equity	Dec. 29, 2012 Level 3 Absolute Return Funds	Dec. 29, 2012 Level 3 Other Assets And Liabilities And Accrued Income
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Fair value of plan assets at beginning of year	$ 365,671	$ 330,085	$ 98,765	$ 10,381	$ 9,413	$ 39,099	$ 39,997	$ (125)
Total gains or losses (realized and unrealized)			4,722	834		1,559	2,336
Purchases			14,468		468	0	14,000
Issues			472	461			11
Sales			(20,872)	(112)	(347)	(6,012)	(14,408)
Settlements			(313)					(313)
Transfers out of Level 3
Fair value of plan assets at end of year	$ 365,671	$ 330,085	$ 97,242	$ 11,564	$ 9,534	$ 34,646	$ 41,936	$ (438)

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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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Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

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Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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