DEFINED BENEFIT RETIREMENT PLAN (Details) £ in Thousands	12 Months Ended
	Dec. 29, 2018 GBP (£) item	Dec. 29, 2018 USD ($) item $ / £	Dec. 30, 2017 USD ($) $ / £	Dec. 31, 2016 USD ($)
Defined Benefit Plan [Abstract]
Defined Benefit Plan, Expected Amortization, Next Fiscal Year		$ 1,650
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 | $ / £		1.2690	1.3490
Defined benefit pension liability		$ 143,904,000	$ 189,552,000
Change in Projected Benefit Obligation
Beginning balance		783,301,000	696,137,000
Interest cost		17,878,000	18,152,000
Prior service costs - GMP equalization	£ 10	12,056,000
Benefits paid		(28,207,000)	(22,172,000)
Actuarial loss		95,480,000	(25,154,000)
Currency translation		(42,108,000)	66,030,000
Ending balance		647,440,000	783,301,000
Plan Assets
Fair value beginning balance		593,749,000	486,667,000
Employer contributions		1,537,000	40,245,000
Actual return on plan assets		(32,120,000)	40,842,000
Benefits paid		(28,207,000)	(22,172,000)
Currency translation		(31,423,000)	48,167,000
Fair value ending balance		503,536,000	593,749,000
Funded status
Funded status		(143,904,000)	(189,552,000)	$ (209,470,000)
Accumulated other comprehensive income (loss)
Balance at the beginning of the period		(168,250,000)	(156,878,000)
Actuarial loss		44,760,000	(1,789,000)
Prior service costs - GMP equalization		(12,056,000)
Currency translation gain (loss)		5,358,000	(9,583,000)
Balance at the end of the period		$ (130,188,000)	$ (168,250,000)
Weighted average actuarial assumptions used to determine the benefit obligation
Discount rate (as a percent)		2.90%	2.55%
CPI index (as a percent)		2.20%	2.20%
RPI Inflation (as a percent)		3.30%	3.30%
Net periodic benefit expense:
Interest cost		$ 17,878,000	$ 18,152,000
Expected return on plan assets		(23,175,000)	(20,486,000)
Amortization of actuarial loss		(3,046,000)	(2,982,000)
Net periodic benefit expense		$ (2,251,000)	$ 648,000
Weighted average actuarial assumptions used to determine expense
Discount rate (as a percent)	2.55%	2.55%	2.80%
Expected return on plan assets (as a percent)	4.29%	4.29%	4.22%
RPI index (as a percent)	2.20%	2.20%	2.25%
CPI index (as a percent)	3.30%	3.30%	3.35%
Limit on employer contributions per annum	£ 10,000	$ 12,690,000
Administrative costs of the Plan	£ 1,100	1,396,000
Expected pension benefit payments
2019		27,790,000
2020		28,680,000
2021		29,695,000
2022		30,585,000
2023		31,600,000
2023-2028		$ 173,470,000
Weighted average maturity period of corporate bond portfolio	13 years	13 years