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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Plan Asset Allocations) (Details) | Sep. 25, 2016 | Dec. 27, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 100.00% | 100.00%
Cash and cash equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 0.00% | 0.00%
Equity securities [Member] | Pooled separate accounts [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 7.00% | 7.00%
Equity securities [Member] | Common collective trusts funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 58.00% | 57.00%
Fixed income securities [Member] | Pooled separate accounts [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 6.00% | 7.00%
Fixed income securities [Member] | Common collective trusts funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 29.00% | 29.00%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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