DEFINED BENEFIT RETIREMENT PLAN (Details) £ in Thousands, $ in Thousands	12 Months Ended				24 Months Ended
	Dec. 31, 2022 USD ($) item $ / £	Dec. 31, 2022 GBP (£) item	Dec. 25, 2021 USD ($) $ / £	Dec. 26, 2020 USD ($)	Dec. 31, 2022 USD ($) $ / £
Retirement Benefits [Abstract]
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 | $ / £	1.209		1.356		1.209
Projected Benefit Obligation
Beginning balance	$ 761,706		$ 860,173		$ 860,173
Interest cost	12,551		9,896
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]					Interest Expense
Benefits paid	(20,175)		(22,952)
Actuarial (gain) loss	(248,252)		(77,379)
Currency translation	(70,119)		(8,032)
Ending balance	435,711		761,706	$ 860,173	$ 435,711
Plan Assets
Fair value beginning balance	761,170		741,650		741,650
Employer contributions	17,155		1,924
Actual return on plan assets	(228,493)		48,637
Benefits paid	(20,175)		(22,952)
Currency translation	(69,730)		(8,089)
Fair value ending balance	459,927		761,170	741,650	459,927
Funded status
Funded status	24,216		(536)	(118,523)	24,216
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	(60,940)		(165,258)		(165,258)
Actuarial gain (loss)	(2,915)		102,529		(2,915)
Currency translation gain	5,451		1,239		5,451
Prior service costs amortization	493		550		493
Balance at the end of the period	$ (57,911)		$ (60,940)	$ (165,258)	$ (57,911)
Weighted average actuarial assumptions used to determine the benefit obligation
Discount rate for benefit obligations	4.80%		1.90%		4.80%
CPI inflation	2.35%		2.70%		2.35%
RPI inflation	3.25%		3.30%		3.25%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	$ 12,551		$ 9,896
Expected return on plan assets	$ (23,131)		$ (27,763)
Defined Benefit Plan Net Periodic Benefit Cost Credit Expected Return Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag	true	true	true
Amortization of prior service cost	$ 493		$ 550
Amortization of actuarial loss			2,750
Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Gain Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag				true
Net periodic benefit	$ (10,087)		$ (14,567)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Weighted average actuarial assumptions used to determine expense
Discount rate for benefit obligations	1.90%	1.90%	1.40%
Discount rate for interest cost	1.80%	1.80%	1.15%
Expected return on plan assets	3.48%	3.48%	3.96%
CPI Inflation	2.70%	2.70%	2.00%
RPI Inflation	3.30%	3.30%	2.90%
Limit on employer contributions per annum	$ 16,000	£ 13,100
Administrative costs of the Plan	1,600	£ 1,300
Expected pension benefit payments
2023	20,432				$ 20,432
2024	21,036				21,036
2025	21,641				21,641
2026	22,366				22,366
2027	22,970				22,970
Years 2028 - 2032	$ 125,733				$ 125,733
Weighted average maturity period of corporate bond portfolio	13 years	13 years