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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Economic Assumptions) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 27, 2016 | Mar. 29, 2015 | Dec. 27, 2015
Pension Benefits [Member] |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 4.18% |  | 4.47%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 4.47% | 4.22% |
Expected return on plan assets | 5.50% | 6.00% |
Other Benefits [Member] |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 3.55% |  | 4.47%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 4.47% | 4.22% |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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