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PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Fair Value Measurements of Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 25, 2022 | Dec. 26, 2021
--- | --- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | $ 225,451 | $ 210,133 | $ 326,409
Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 5,394 | 12,072 |
Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 220,057 | 198,061 |
Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
All Pension Plans | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 5,394 | 12,072 |
All Pension Plans | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 5,394 | 12,072 |
All Pension Plans | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
All Pension Plans | Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Large U.S. equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 2,123 | 1,995 |
PSAs for the Union Plan | Large U.S. equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Large U.S. equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 2,123 | 1,995 |
PSAs for the Union Plan | Large U.S. equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Small/Mid U.S. equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 1,133 | 1,055 |
PSAs for the Union Plan | Small/Mid U.S. equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Small/Mid U.S. equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 1,133 | 1,055 |
PSAs for the Union Plan | Small/Mid U.S. equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | International equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 1,654 | 1,672 |
PSAs for the Union Plan | International equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | International equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 1,654 | 1,672 |
PSAs for the Union Plan | International equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Fixed income funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 3,640 | 3,838 |
PSAs for the Union Plan | Fixed income funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Fixed income funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 3,640 | 3,838 |
PSAs for the Union Plan | Fixed income funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 437 | 0 |
PSAs for the Union Plan | Real estate | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the Union Plan | Real estate | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 437 | 0 |
PSAs for the Union Plan | Real estate | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Large U.S. equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 27,516 | 23,541 |
PSAs and CCTs for the GK Pension Plan | Large U.S. equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Large U.S. equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 27,516 | 23,541 |
PSAs and CCTs for the GK Pension Plan | Large U.S. equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Small/Mid U.S. equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 13,991 | 12,446 |
PSAs and CCTs for the GK Pension Plan | Small/Mid U.S. equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Small/Mid U.S. equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 13,991 | 12,446 |
PSAs and CCTs for the GK Pension Plan | Small/Mid U.S. equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | International equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 13,751 | 13,171 |
PSAs and CCTs for the GK Pension Plan | International equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | International equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 13,751 | 13,171 |
PSAs and CCTs for the GK Pension Plan | International equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Fixed income funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 34,111 | 30,865 |
PSAs and CCTs for the GK Pension Plan | Fixed income funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Fixed income funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 34,111 | 30,865 |
PSAs and CCTs for the GK Pension Plan | Fixed income funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 5,174 | 6,458 |
PSAs and CCTs for the GK Pension Plan | Real estate | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs and CCTs for the GK Pension Plan | Real estate | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 5,174 | 6,458 |
PSAs and CCTs for the GK Pension Plan | Real estate | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Large U.S. equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 29,648 | 23,149 |
PSAs for the U.K. Plans | Large U.S. equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Large U.S. equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 29,648 | 23,149 |
PSAs for the U.K. Plans | Large U.S. equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | International equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 36,507 | 31,767 |
PSAs for the U.K. Plans | International equity funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | International equity funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 36,507 | 31,767 |
PSAs for the U.K. Plans | International equity funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Fixed income funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 3,376 | 3,081 |
PSAs for the U.K. Plans | Fixed income funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Fixed income funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 3,376 | 3,081 |
PSAs for the U.K. Plans | Fixed income funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 14,985 | 16,297 |
PSAs for the U.K. Plans | Real estate | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Real estate | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 14,985 | 16,297 |
PSAs for the U.K. Plans | Real estate | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Liability driven investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 32,011 | 28,726 |
PSAs for the U.K. Plans | Liability driven investments | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
PSAs for the U.K. Plans | Liability driven investments | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | 32,011 | 28,726 |
PSAs for the U.K. Plans | Liability driven investments | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

X
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