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DEFINED BENEFIT RETIREMENT PLAN (Details) £ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 25, 2021 USD ($) | Dec. 26, 2020 USD ($) item $ / £ | Dec. 26, 2020 GBP (£) item | Dec. 28, 2019 USD ($) $ / £ | Dec. 29, 2018 USD ($) | Dec. 29, 2018 GBP (£)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension retirement benefits to qualified employees as percent of final salary per year of service |  | 1.67% | 1.67% |  |  |
Eligibility age |  | 65 years | 65 years |  |  |
Active members of defined benefit retirement income plan | item |  | 0 | 0 |  |  |
Foreign currency exchange rate used to translate the net pension liability | $ / £ |  | 1.308 |  | 1.356 |  |
Projected Benefit Obligation |  |  |  |  |  |
Beginning balance | $ 860,173 | $ 744,403 |  | $ 647,440 |  |
Interest cost |  | 12,954 |  | 16,923 |  |
Prior service costs - GMP equalization |  | 949 | £ 711 |  |  | £ 9,500
Benefits paid |  | (18,212) |  | (20,769) |  |
Actuarial (gain) loss |  | 87,855 |  | 79,485 |  |
Currency translation |  | 32,224 |  | 21,324 |  |
Ending balance |  | 860,173 |  | 744,403 | $ 647,440 |
Plan Assets |  |  |  |  |  |
Fair value beginning balance | 741,650 | 604,396 |  | 503,536 |  |
Employer contributions |  | 35,399 |  | 18,461 |  |
Actual return on plan assets |  | 89,988 |  | 86,081 |  |
Benefits paid |  | (18,212) |  | (20,769) |  |
Currency translation |  | 30,079 |  | 17,087 |  |
Fair value ending balance |  | 741,650 |  | 604,396 | 503,536 |
Funded status |  |  |  |  |  |
Funded status |  | (118,523) |  | (140,007) | (143,904) |
Accumulated other comprehensive income (loss) |  |  |  |  |  |
Balance at the beginning of the period | $ (165,258) | (143,726) |  | (130,188) |  |
Actuarial gain (loss) |  | (16,731) |  | (10,839) |  |
Currency translation gain (loss) |  | (3,987) |  | (2,699) |  |
Prior service costs - GMP equalization |  | (814) |  |  |  |
Balance at the end of the period |  | $ (165,258) |  | $ (143,726) | $ (130,188) |
Weighted average actuarial assumptions used to determine the benefit obligation |  |  |  |  |  |
Discount rate |  | 1.40% |  | 2.05% |  |
CPI inflation |  | 2.00% |  | 2.15% |  |
RPI inflation |  | 2.90% |  | 3.05% |  |
Net Periodic Benefit Cost: |  |  |  |  |  |
Interest cost |  | $ 12,954 |  | $ 16,923 |  |
Expected return on plan assets |  | (23,215) |  | (20,000) |  |
Amortization of prior service cost |  | 513 |  | 513 |  |
Amortization of actuarial loss |  | 2,437 |  | 2,051 |  |
Net periodic benefit expense (benefit) |  | $ (7,311) |  | $ (513) |  |
Weighted average actuarial assumptions used to determine expense |  |  |  |  |  |
Discount rate |  | 2.05% | 2.05% | 2.90% |  |
Expected return on plan assets |  | 4.18% | 4.18% | 4.25% |  |
CPI Inflation |  | 2.15% | 2.15% | 2.20% |  |
RPI Inflation |  | 3.05% | 3.05% | 3.30% |  |
Limit on employer contributions per annum |  | $ 17,765 | £ 13,100 |  |  |
Administrative costs of the Plan |  | 1,763 | £ 1,300 |  |  |
Expected pension benefit payments |  |  |  |  |  |
2021 |  | 19,935 |  |  |  |
2022 |  | 20,477 |  |  |  |
2023 |  | 21,155 |  |  |  |
2024 |  | 21,698 |  |  |  |
2025 |  | 22,376 |  |  |  |
Years 2026 - 2030 |  | $ 122,727 |  |  |  |
Weighted average maturity period of corporate bond portfolio |  | 13 years | 13 years |  |  |
Forecast |  |  |  |  |  |
Weighted average actuarial assumptions used to determine expense |  |  |  |  |  |
Expected return on plan assets | 3.96% |  |  |  |  |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of defined benefit plan cost (credit), classified as other. + References No definition available. + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Represents the number of active employees as members of defined benefit retirement plan. + References No definition available. + Details
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- Definition The pretax net amount of gains and losses related to currency translation that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. + References No definition available. + Details
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- Definition Represents the age after which the qualified employees to receive retirement benefits. + References No definition available. + Details
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- Definition Amount of benefits expected to be paid in the five fiscal years after the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References No definition available. + Details
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