SELECTED QUARTERLY FINANCIAL DATA (unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
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
Gross profit	262,314	246,116	238,104	211,777	226,417	216,200	215,981	181,469
Operating income	108,789	92,802	79,768	69,792	102,482	84,362	76,710	67,829	351,151	331,383	288,282
Net income attributable to common shareholders	$ 80,348	$ 72,810	$ 43,728	$ 55,133	$ 59,665	$ 60,368	$ 53,709	$ 52,631	$ 252,019	$ 226,373	$ 123,355
Basic:
Continuing operations attributable to common shareholders (in dollars per share)	$ 1.64	$ 1.49	$ 0.90	$ 1.14	$ 1.24	$ 1.25	$ 1.08	$ 1.10	$ 5.17	$ 4.69	$ 2.60
Discontinued operations (in dollars per share)	0	0	0	0	0	0	0.03	0	0	0.03	0
Net income attributable to common shareholders (in dollars per share)	1.64	1.49	0.90	1.14	1.24	1.25	1.11	1.10	5.17	4.72	2.60
Diluted:
Continuing operations attributable to common shareholders (in dollars per share)	1.61	1.46	0.88	1.11	1.21	1.22	1.06	1.08	5.07	4.59	2.54
Discontinued operations (in dollars per share)	0	0	0	0	0	0	0.03	0	0	0.03	0
Net income attributable to common shareholders (in dollars per share)	$ 1.61	$ 1.46	$ 0.88	$ 1.11	$ 1.21	$ 1.22	$ 1.10	$ 1.08	$ 5.07	$ 4.62	$ 2.54