Significant Unobservable Inputs in Estimation of Fair Value (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013 Level 3	Dec. 28, 2013 Level 3 Real Estate Funds	Dec. 28, 2013 Level 3 Guaranteed Insurance Contracts	Dec. 28, 2013 Level 3 Hedge Funds, Equity	Dec. 28, 2013 Level 3 Absolute Return Funds	Dec. 28, 2013 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	$ 428,605	$ 365,671	$ 97,242	$ 11,564	$ 9,534	$ 34,646	$ 41,936	$ (438)
Total gains or losses (realized and unrealized)			10,779	1,336		4,652	4,791
Purchases			39,943		443	26,500	13,000
Issues			558	558
Sales			(8,165)	(160)	(383)	(7,622)
Settlements			332					332
Transfers out of Level 3
Fair value of plan assets at end of year	$ 428,605	$ 365,671	$ 140,689	$ 13,298	$ 9,594	$ 58,176	$ 59,727	$ (106)

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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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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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