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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Common collective trusts the invest in	$ 92,283	$ 81,193
Fair Value, Inputs, Level 1 [Member]
Common collective trusts the invest in	0	0
Fair Value, Inputs, Level 2 [Member]
Common collective trusts the invest in	92,283	81,193
Fair Value, Inputs, Level 3 [Member]
Common collective trusts the invest in	0	0
Equity Securities [Member]
Common collective trusts the invest in	65,145	57,495
Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Common collective trusts the invest in	0	0
Equity Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Common collective trusts the invest in	65,145	57,495
Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Common collective trusts the invest in	0	0
Debt Securities [Member]
Common collective trusts the invest in	27,138	23,698
Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Common collective trusts the invest in	0	0
Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Common collective trusts the invest in	27,138	23,698
Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Common collective trusts the invest in	$ 0	$ 0

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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