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