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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. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016
Net pension and other postretirement cost: |  |  |
Increase in Discount Rate of 0.25% - impact on defined benefit obligation for pension benefits | $ (3,924) |  |
Decrease in Discount Rate of 0.25% - impact on defined benefit obligation for pension benefits | $ 4,122 |  |
Pension Benefits |  |  |
Benefit obligation: |  |  |
Discount rate | 4.40% | 3.69% | 4.31%
Net pension and other postretirement cost: |  |  |
Discount rate | 3.69% | 4.32% | 4.47%
Expected return on plan assets | 5.50% | 5.50% | 5.50%
Other Benefits |  |  |
Benefit obligation: |  |  |
Discount rate | 4.07% | 3.39% | 3.81%
Net pension and other postretirement cost: |  |  |
Discount rate | 3.39% | 3.81% | 4.47%

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