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EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligations | $ 367,468 | $ 367,468 | $ 447,409 | $ 362,805
Plan assets | 324,752 | 324,752 | 357,181 | 305,709
Employer contributions to participants within plan assets |  | 34,092 | 2,105 |
Net periodic benefit cost (income) |  | $ 7,277 | 4,022 | 1,332
Deferral period |  | 3 years |  |
Maximum annual contributions per employee, percent |  | 10.00% |  |
Period of highest consecutive years of compensation |  | 5 years |  |
Costs associated with deferred compensation plan and executive supplemental life insurance retirement plans |  | $ 5,700 | 2,500 | 2,900
Cash surrender value of life insurance policies | 43,827 | 43,827 | 38,207 |
Change in projected benefit obligation based on sensitivity | 17,000 | $ 17,000 |  |
Sensitivity of expected rate of return on plan assets, percent change |  | 0.50% |  |
Sensitivity of change in expected rate of return, annual pension expense amount |  | $ 1,600 |  |
Decrease in benefit obligations from new morality improvement scales |  | 7,800 | 2,800 |
Expected employer contributions in next fiscal year | 900 | 900 |  |
Accumulated benefit obligation | 1,300 | 1,300 | 1,100 |
Costs associated with employee savings plan |  | 14,600 | 19,100 | 13,400
U.K. Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions to participants within plan assets |  | 23,000 |  |
U.K. Plan | Defined Benefit Plan, Funding Status |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions to participants within plan assets |  | 28,900 |  |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligations | 93,800 | 93,800 |  |
Plan assets | 93,000 | 93,000 |  |
Employer contributions to participants within plan assets | 800 | 24,600 |  |
Non-cash settlement charge related to pension losses, reclassified from AOCI to other expense |  | 10,300 |  |
Net periodic benefit cost (income) |  | 1,600 | 1,500 | $ (1,500)
Employer contributions to participants outside of plan assets |  | 9,500 |  |
Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets | $ 63,465 | $ 63,465 | 91,998 |
Target asset allocation percentage | 22.10% | 22.10% |  |
Fixed Income Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets | $ 99,188 | $ 99,188 | 129,965 |
Target asset allocation percentage | 15.30% | 15.30% |  |
Other Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets | $ 68,263 | $ 68,263 | $ 56,852 |
Target asset allocation percentage | 62.60% | 62.60% |  |
Executive Officer |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Costs associated with deferred compensation plan and executive supplemental life insurance retirement plans |  | $ 8,100 |  |
Settlement charges related to pension losses |  | $ 2,100 |  |

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