DEFINED BENEFIT RETIREMENT PLAN (Details) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 24, 2022 USD ($)	Dec. 25, 2021 USD ($) item $ / £	Dec. 25, 2021 GBP (£) item	Dec. 26, 2020 USD ($) $ / £	Dec. 28, 2019 USD ($)
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	$ 761,706	$ 860,173		$ 744,403
Interest cost		9,896		12,954
Prior service costs - GMP equalization				949
Benefits paid		(22,952)		(18,212)
Actuarial (gain) loss		(77,379)		87,855
Currency translation		(8,032)		32,224
Ending balance		761,706		860,173
Plan Assets
Fair value beginning balance	761,170	741,650		604,396
Employer contributions		1,924		35,399
Actual return on plan assets		48,637		89,988
Benefits paid		(22,952)		(18,212)
Currency translation		(8,089)		30,079
Fair value ending balance		761,170		741,650
Funded status
Funded status		(536)		(118,523)	$ (140,007)
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (60,940)	(165,258)		(143,726)
Actuarial gain (loss)		102,529		(16,731)
Currency translation gain (loss)		1,239		(3,987)
Prior service costs amortization		550		(814)
Balance at the end of the period		$ (60,940)		$ (165,258)
Weighted average actuarial assumptions used to determine the benefit obligation
Discount rate		1.90%		1.40%
CPI inflation		2.70%		2.00%
RPI inflation		3.30%		2.90%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost		$ 9,896		$ 12,954
Expected return on plan assets		(27,763)		(23,215)
Amortization of prior service cost		550		513
Amortization of actuarial loss		2,750		2,437
Net periodic benefit expense (benefit)		$ (14,567)		$ (7,311)
Weighted average actuarial assumptions used to determine expense
Discount rate		1.15%	1.15%	2.05%
Expected return on plan assets		3.96%	3.96%	4.18%
CPI Inflation		2.00%	2.00%	2.15%
RPI Inflation		2.90%	2.90%	3.05%
Limit on employer contributions per annum		$ 17,765	£ 13,100
Administrative costs of the Plan		1,763	£ 1,300
Expected pension benefit payments
2022		23,045
2023		23,850
2024		24,650
2025		25,455
2026		26,260
Years 2027 - 2031		$ 144,400
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	3.48%