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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2021 USD ($) | Sep. 27, 2020 USD ($) | Sep. 26, 2021 USD ($) plan | Sep. 27, 2020 USD ($) | Dec. 27, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Retirement plan expenses | $ 13,600,000 | $ 4,300,000 | $ 13,300,000 | $ 6,200,000 |
Accumulated benefit obligation, defined benefit pension plans | 386,400,000 |  | $ 386,400,000 |  | $ 404,200,000
Weighted average duration of defined benefit obligation |  |  | 18 years 2 months 19 days |  |
Expenses related to defined contribution plans | $ 3,600,000 |  | $ 11,700,000 |  |
U.S. |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Number of defined contribution plans | plan |  |  | 2 |  |
Mexico |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Number of defined contribution plans | plan |  |  | 3 |  |
U.K. and Europe |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Number of defined contribution plans | plan |  |  | 2 |  |
Fixed income securities | Union Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 50.00% |  | 50.00% |  |
Fixed income securities | GK Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 35.00% |  | 35.00% |  |
Fixed income securities | U.K. Plans |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 28.00% |  | 28.00% |  |
Equity securities | Union Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 50.00% |  | 50.00% |  |
Equity securities | GK Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 60.00% |  | 60.00% |  |
Equity securities | U.K. Plans |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 62.00% |  | 62.00% |  |
Real estate | GK Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 5.00% |  | 5.00% |  |
Real estate | U.K. Plans |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Target plan asset allocations | 10.00% |  | 10.00% |  |
Pension Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Expected contributions, remainder of 2021 | $ 1,800,000 |  | $ 1,800,000 |  |
Other Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Change in discount rate on projected benefit obligation, percentage |  |  | 0.25% |  |
Impact of 0.25% change in discount rate on projected benefit obligation |  |  | $ 1,000 |  |
Expected contributions, remainder of 2021 | $ 100,000 |  | $ 100,000 |  |

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