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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Fair Value Assumptions of Plan Assets) (Details) - USD ($) $ in Thousands | Mar. 28, 2021 | Dec. 27, 2020
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 312,429 | $ 305,983
Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,975 | 1,487
Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 306,454 | 304,496
Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,975 | 1,487
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,975 | 1,487
Cash and cash equivalents | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Cash and cash equivalents | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 3,339 | 3,100
Large U.S. equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 31,190 | 29,602
Large U.S. equity funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 43,792 | 39,002
Large U.S. equity funds | Level 1 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Level 1 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Level 1 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Level 2 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 3,339 | 3,100
Large U.S. equity funds | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 31,190 | 29,602
Large U.S. equity funds | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 43,792 | 39,002
Large U.S. equity funds | Level 3 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Level 3 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Level 3 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 451 | 392
Small/Mid U.S. equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 16,602 | 17,569
Small/Mid U.S. equity funds | Level 1 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Level 1 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Level 2 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 451 | 392
Small/Mid U.S. equity funds | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 16,602 | 17,569
Small/Mid U.S. equity funds | Level 3 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Level 3 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 2,013 | 1,874
International equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,682 | 16,320
International equity funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 68,524 | 69,251
International equity funds | Level 1 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Level 1 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Level 1 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Level 2 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 2,013 | 1,874
International equity funds | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,682 | 16,320
International equity funds | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 68,524 | 69,251
International equity funds | Level 3 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Level 3 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Level 3 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,055 | 5,365
Fixed income securities | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 37,860 | 38,944
Fixed income securities | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 59,076 | 60,212
Fixed income securities | Level 1 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities | Level 1 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities | Level 1 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities | Level 2 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,055 | 5,365
Fixed income securities | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 37,860 | 38,944
Fixed income securities | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 59,076 | 60,212
Fixed income securities | Level 3 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities | Level 3 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities | Level 3 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Real estate | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,163 | 5,677
Real estate | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 17,707 | 17,188
Real estate | Level 1 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Real estate | Level 1 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Real estate | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,163 | 5,677
Real estate | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 17,707 | 17,188
Real estate | Level 3 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Real estate | Level 3 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

X
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