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Pension and Other Post-retirement Benefits (Detail) - Plan`s assets at fair value (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Pension Plans, Defined Benefit [Member] \| Cash [Member]
Pension plan assets at fair value
Pension Plans, Defined Benefit [Member] \| Equity Securities [Member]
Pension plan assets at fair value	20,939	16,674
Pension Plans, Defined Benefit [Member] \| Group Annuity Contract [Member]
Pension plan assets at fair value	15,062	16,221
Pension Plans, Defined Benefit [Member] \| Debt Securities [Member]
Pension plan assets at fair value
Pension Plans, Defined Benefit [Member]
Pension plan assets at fair value	36,001	32,895	29,762
Fair Value, Inputs, Level 1 [Member] \| Cash [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Pension plan assets at fair value	20,939	16,674
Fair Value, Inputs, Level 1 [Member] \| Group Annuity Contract [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 1 [Member] \| Debt Securities [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 1 [Member]
Pension plan assets at fair value	20,939	16,674
Fair Value, Inputs, Level 2 [Member] \| Cash [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 2 [Member] \| Group Annuity Contract [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 2 [Member] \| Debt Securities [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 2 [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 3 [Member] \| Cash [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 3 [Member] \| Equity Securities [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 3 [Member] \| Group Annuity Contract [Member]
Pension plan assets at fair value	15,062	16,221	15,999
Fair Value, Inputs, Level 3 [Member] \| Debt Securities [Member]
Pension plan assets at fair value
Fair Value, Inputs, Level 3 [Member]
Pension plan assets at fair value	$ 15,062	$ 16,221

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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