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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Economic Assumptions, and Impact of Change in Discount Rate on Benefit Obligation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 25, 2016 | Dec. 27, 2015 | Dec. 28, 2014
Net pension and other postretirement cost: |  |  |
Increase in Discount Rate of 0.25% - impact on defined benefit obligation for pension benefits | $ (4,486) |  |
Decrease in Discount Rate of 0.25% - impact on defined benefit obligation for pension benefits | $ 4,725 |  |
Pension Benefits [Member] |  |  |
Benefit obligation: |  |  |
Discount rate | 4.31% | 4.47% | 4.22%
Net pension and other postretirement cost: |  |  |
Discount rate | 4.47% | 4.22% | 4.95%
Expected return on plan assets | 5.50% | 5.50% | 6.00%
Other Benefits [Member] |  |  |
Benefit obligation: |  |  |
Discount rate | 3.81% | 4.47% | 4.22%
Net pension and other postretirement cost: |  |  |
Discount rate | 4.47% | 4.22% | 4.95%

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