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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Fair Value Assumptions of Plan Assets) (Details) - USD ($) $ in Thousands | Mar. 27, 2016 | Dec. 27, 2015
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 91,677 | $ 96,947
Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 126 | 147
Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 91,551 | 96,800
Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Cash and cash equivalents [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 126 | 147
Cash and cash equivalents [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 126 | 147
Cash and cash equivalents [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Cash and cash equivalents [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds [Member] | Pooled separate accounts [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 3,692 | 3,816
Large U.S. equity funds [Member] | Pooled separate accounts [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds [Member] | Pooled separate accounts [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 3,692 | 3,816
Large U.S. equity funds [Member] | Pooled separate accounts [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds [Member] | Common collective trusts funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 21,657 | 22,069
Large U.S. equity funds [Member] | Common collective trusts funds [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds [Member] | Common collective trusts funds [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 21,657 | 22,069
Large U.S. equity funds [Member] | Common collective trusts funds [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds [Member] | Pooled separate accounts [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 937 | 969
Small/Mid U.S. equity funds [Member] | Pooled separate accounts [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds [Member] | Pooled separate accounts [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 937 | 969
Small/Mid U.S. equity funds [Member] | Pooled separate accounts [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds [Member] | Common collective trusts funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,392 | 16,843
Small/Mid U.S. equity funds [Member] | Common collective trusts funds [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds [Member] | Common collective trusts funds [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,392 | 16,843
Small/Mid U.S. equity funds [Member] | Common collective trusts funds [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds [Member] | Pooled separate accounts [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 1,498 | 1,606
International equity funds [Member] | Pooled separate accounts [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds [Member] | Pooled separate accounts [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 1,498 | 1,606
International equity funds [Member] | Pooled separate accounts [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds [Member] | Common collective trusts funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,415 | 16,629
International equity funds [Member] | Common collective trusts funds [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds [Member] | Common collective trusts funds [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,415 | 16,629
International equity funds [Member] | Common collective trusts funds [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds [Member] | Pooled separate accounts [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 6,149 | 6,337
Fixed income funds [Member] | Pooled separate accounts [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds [Member] | Pooled separate accounts [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 6,149 | 6,337
Fixed income funds [Member] | Pooled separate accounts [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds [Member] | Common collective trusts funds [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 26,811 | 28,531
Fixed income funds [Member] | Common collective trusts funds [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds [Member] | Common collective trusts funds [Member] | Level 2 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 26,811 | 28,531
Fixed income funds [Member] | Common collective trusts funds [Member] | Level 3 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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