GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
Sep. 26, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,005,245
Additions	370,237
Currency Translation	6,390
Goodwill, ending balance	1,381,872
U.S.
Goodwill [Roll Forward]
Goodwill, beginning balance	41,936
Additions	0
Currency Translation	0
Goodwill, ending balance	41,936
U.K. and Europe
Goodwill [Roll Forward]
Goodwill, beginning balance	835,505
Additions	370,237
Currency Translation	6,390
Goodwill, ending balance	1,212,132
Mexico
Goodwill [Roll Forward]
Goodwill, beginning balance	127,804
Additions	0
Currency Translation	0
Goodwill, ending balance	$ 127,804

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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