SEGMENT REPORTING - Schedule of Segment Reporting, Goodwill and Assets (Details) - USD ($) $ in Thousands	Sep. 24, 2017	Dec. 25, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 995,582	$ 887,221
Assets	6,063,285	5,021,942
Elimination
Segment Reporting Information [Line Items]
Assets	(604,225)	(304,802)
Elimination | U.S. Segment's Investment In The Mexico Segment
Segment Reporting Information [Line Items]
Assets	191,700	191,800
Elimination | Receivables Between U.S. And Mexico Segments
Segment Reporting Information [Line Items]
Assets	111,200	113,000
Elimination | U.S. Segment's Investment In The U.K. And Europe Segment
Segment Reporting Information [Line Items]
Assets	301,300
U.S.
Segment Reporting Information [Line Items]
Goodwill	41,936	0
U.S. | Reportable Geographical Components
Segment Reporting Information [Line Items]
Goodwill	41,936	0
Assets	3,515,513	2,472,931
U.K. and Europe
Segment Reporting Information [Line Items]
Goodwill	828,038	761,613
U.K. and Europe | Reportable Geographical Components
Segment Reporting Information [Line Items]
Goodwill	828,038	761,613
Assets	2,204,885	2,013,725
Mexico
Segment Reporting Information [Line Items]
Goodwill	125,608	125,608
Mexico | Reportable Geographical Components
Segment Reporting Information [Line Items]
Goodwill	125,608	125,608
Assets	$ 947,112	$ 840,088