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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Plan Asset Allocations) (Details) | Sep. 26, 2021 | Dec. 27, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 100.00% | 100.00%
Cash and cash equivalents | Union Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2.00% | 1.00%
Equity securities | Union Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2.00% | 2.00%
Equity securities | GK Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 20.00% | 20.00%
Equity securities | U.K. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 36.00% | 35.00%
Fixed income securities | Union Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2.00% | 2.00%
Fixed income securities | GK Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 12.00% | 13.00%
Fixed income securities | U.K. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 19.00% | 20.00%
Real estate | GK Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1.00% | 1.00%
Real estate | U.K. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 6.00% | 6.00%

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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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