SEGMENT AND GEOGRAPHIC INFORMATION - Revenue and Long-Lived Assets by Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 691,138	$ 667,951	$ 657,568	$ 604,569	$ 601,530	$ 585,295	$ 585,301	$ 493,970	$ 2,621,226	$ 2,266,096	$ 1,857,601
Long-lived assets	1,044,128				932,877				1,044,128	932,877	781,973
U.S.
Segment Reporting Information [Line Items]
Revenue									1,471,097	1,267,620	959,263
Long-lived assets	602,654				597,223				602,654	597,223	446,574
Europe
Segment Reporting Information [Line Items]
Revenue									726,421	643,957	569,812
Long-lived assets	253,665				205,185				253,665	205,185	203,911
Canada
Segment Reporting Information [Line Items]
Revenue									271,987	206,382	200,343
Long-lived assets	127,495				74,051				127,495	74,051	82,228
Asia Pacific
Segment Reporting Information [Line Items]
Revenue									146,218	142,495	126,462
Long-lived assets	60,213				56,262				60,213	56,262	49,020
Other
Segment Reporting Information [Line Items]
Revenue									5,503	5,642	1,721
Long-lived assets	$ 101				$ 156				$ 101	$ 156	$ 240