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Summary of 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
Summary Of Quarterly Financial Data Unaudited [Abstract]
Net sales	$ 441,166	$ 474,778	$ 355,963	$ 426,445	$ 411,825	$ 414,779	$ 316,338	$ 388,633	$ 1,698,352	$ 1,531,575	$ 1,444,497
Gross profit	276,114	296,390	217,186	262,233	251,079	250,517	188,888	237,477	1,051,923	927,961	897,347
Operating income	32,991	39,152	7,245	32,707	38,120	25,321	2,086	26,901	112,095	92,428	91,915
Net income	$ 24,093	$ 28,054	$ 4,280	$ 25,418	$ 26,990	$ 18,257	$ 3,744	$ 20,548	$ 81,845	$ 69,539	$ 65,077
Net income per share – diluted	$ 0.82	$ 0.94	$ 0.14	$ 0.80	$ 0.81	$ 0.52	$ 0.10	$ 0.52	$ 2.70	$ 1.92	$ 1.55

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