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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Fair Value Assumptions of Plan Assets) (Details) - USD ($) $ in Thousands | Sep. 27, 2020 | Dec. 29, 2019
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 279,261 | $ 294,589
Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 6,819 | 11,582
Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 272,442 | 283,007
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 | 6,819 | 11,582
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 6,819 | 11,582
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 | 2,962 | 3,071
Large U.S. equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 26,324 | 20,378
Large U.S. equity funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 35,091 | 17,756
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 | 2,962 | 3,071
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 | 26,324 | 20,378
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 | 35,091 | 17,756
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 | 368 | 372
Small/Mid U.S. equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 13,763 | 12,495
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 | 368 | 372
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 | 13,763 | 12,495
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 | 1,772 | 1,878
International equity funds | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 14,105 | 25,149
International equity funds | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 56,792 | 102,494
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 | 1,772 | 1,878
International equity funds | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 14,105 | 25,149
International equity funds | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 56,792 | 102,494
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 | 5,037 | 4,452
Fixed income securities | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 37,365 | 35,627
Fixed income securities | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 57,223 | 53,722
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 | 5,037 | 4,452
Fixed income securities | Level 2 | GK Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 37,365 | 35,627
Fixed income securities | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 57,223 | 53,722
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 | 5,664 | 5,613
Real estate | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,976 | 0
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 | 5,664 | 5,613
Real estate | Level 2 | U.K. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 15,976 | 0
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

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