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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 | 9 Months Ended |
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Dec. 29, 2019
Assumptions used to measure net pension and other postretirement cost: |  |  |
Increase in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits | $ (10,302) |  |
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits | $ 10,846 |  |
Pension Benefits |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 1.97% |  | 2.56%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 2.51% | 4.40% |
Expected return on plan assets | 4.67% | 5.50% |
Other Benefits |  |  |
Assumptions used to measure benefit obligation at end of period: |  |  |
Discount rate | 2.05% |  | 2.77%
Assumptions used to measure net pension and other postretirement cost: |  |  |
Discount rate | 2.77% | 4.07% |

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