Summary of Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Summary of Quarterly Financial Data (unaudited) [Abstract]
Net sales	$ 363,279	$ 402,646	$ 284,673	$ 393,899	$ 313,445	$ 367,988	$ 276,878	$ 352,980	$ 1,444,497	$ 1,311,291	$ 1,213,699
Gross profit	220,804	253,465	176,619	246,459	197,482	232,343	171,261	209,074	897,347	810,160	740,751
Operating income (loss)	20,119	39,029	(3,061)	35,828	15,312	39,044	2,396	19,898	91,915	76,650	75,096
Net income (loss)	$ 15,791	$ 25,603	$ (778)	$ 24,461	$ 11,287	$ 25,745	$ 1,416	$ 12,969	$ 65,077	$ 51,417	$ 50,519
Net income (loss) per share – diluted	$ 0.39	$ 0.62	$ (0.02)	$ 0.56	$ 0.25	$ 0.56	$ 0.03	$ 0.27	$ 1.55	$ 1.10	$ 0.97