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PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Fair Value Measurements of Plan Assets (Details) - USD ($) $ in Thousands | Mar. 27, 2022 | Dec. 26, 2021
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 306,641 | $ 326,409
Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 35,288 | 6,166
Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 271,353 | 320,243
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 | 35,288 | 6,166
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 35,288 | 6,166
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 | 2,385 | 2,595
Large U.S. equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 29,346 | 31,960
Large U.S. equity funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 34,788 | 45,373
Large U.S. equity funds | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 2,621
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 1 | GEO Adams Plan |  |
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 | 2,385 | 2,595
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 | 29,346 | 31,960
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 | 34,788 | 45,373
Large U.S. equity funds | Level 2 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 2,621
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
Large U.S. equity funds | Level 3 | GEO Adams Plan |  |
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 | 1,254 | 1,338
Small/Mid U.S. equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,226 | 16,232
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 | 1,254 | 1,338
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 | 15,226 | 16,232
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 | 1,800 | 1,954
International equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 14,711 | 15,710
International equity funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 27,059 | 60,188
International equity funds | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 8,606 | 11,696
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 1 | GEO Adams Plan |  |
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 | 1,800 | 1,954
International equity funds | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 14,711 | 15,710
International equity funds | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 27,059 | 60,188
International equity funds | Level 2 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 8,606 | 11,696
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
International equity funds | Level 3 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 4,878 | 5,186
Fixed income funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 38,586 | 40,470
Fixed income funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 1,058 | 55,107
Fixed income funds | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 2,901 | 5,807
Fixed income funds | Level 1 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Level 1 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Level 1 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Level 1 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Level 2 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 4,878 | 5,186
Fixed income funds | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 38,586 | 40,470
Fixed income funds | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 1,058 | 55,107
Fixed income funds | Level 2 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 2,901 | 5,807
Fixed income funds | Level 3 | Union Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Level 3 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income 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 funds | Level 3 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Liability driven investments | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 58,886 | 0
Liability driven investments | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 4,989 | 0
Liability driven investments | Level 1 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Liability driven investments | Level 1 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Liability driven investments | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 58,886 | 0
Liability driven investments | Level 2 | GEO Adams Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 4,989 | 0
Liability driven investments | Level 3 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Liability driven investments | Level 3 | GEO Adams Plan |  |
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 | 5,759 | 5,405
Real estate | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 19,121 | 18,601
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 | 5,759 | 5,405
Real estate | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 19,121 | 18,601
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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