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Summary of Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Summary Of Quarterly Financial Data Unaudited [Abstract]
Net sales	$ 411,825	$ 414,779	$ 316,338	$ 388,633	$ 363,279	$ 402,646	$ 284,673	$ 393,899	$ 1,531,575	$ 1,444,497	$ 1,311,291
Gross profit	251,079	250,517	188,888	237,477	220,804	253,465	176,619	246,459	927,961	897,347	810,160
Operating income (loss)	38,120	25,321	2,086	26,901	20,119	39,029	(3,061)	35,828	92,428	91,915	76,650
Net income (loss)	$ 26,990	$ 18,257	$ 3,744	$ 20,548	$ 15,791	$ 25,603	$ (778)	$ 24,461	$ 69,539	$ 65,077	$ 51,417
Net income (loss) per share – diluted	$ 0.81	$ 0.52	$ 0.10	$ 0.52	$ 0.39	$ 0.62	$ (0.02)	$ 0.56	$ 1.92	$ 1.55	$ 1.10

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