GOODWILL AND IDENTIFIED INTANGIBLE ASSETS (Schedule of Goodwill by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 887,221	$ 1,072,206
Additions	41,936	(30,958)
Currency Translation	72,732	(154,027)
Goodwill, end of period	1,001,889	887,221
United States
Goodwill [Roll Forward]
Goodwill, beginning of period	0	0
Additions	41,936	0
Currency Translation	0	0
Goodwill, end of period	41,936	0
U.K. and Europe
Goodwill [Roll Forward]
Goodwill, beginning of period	761,614	915,641
Additions	0	0
Currency Translation	72,732	(154,027)
Goodwill, end of period	834,346	761,614
Mexico
Goodwill [Roll Forward]
Goodwill, beginning of period	125,607	156,565
Additions	0	(30,958)
Currency Translation	0	0
Goodwill, end of period	$ 125,607	$ 125,607