Summary of Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Summary of Quarterly Financial Data (unaudited) [Abstract]
Net sales	$ 322,216	$ 323,366	$ 234,763	$ 276,412	$ 230,854	$ 263,689	$ 207,391	$ 258,237	$ 1,156,757	$ 960,171	$ 934,978
Gross profit	194,486	198,584	142,397	171,383	140,521	166,420	131,398	163,416	706,850	601,755	596,546
Operating income	27,887	35,346	12,711	25,802	9,655	30,699	15,107	35,227	101,746	90,688	119,787
Net income	$ 18,947	$ 23,554	$ 8,481	$ 16,992	$ 6,425	$ 20,259	$ 9,926	$ 23,471	$ 67,974	$ 60,081	$ 78,094
Net income per share – diluted	$ 0.35	$ 0.44	$ 0.16	$ 0.31	$ 0.12	$ 0.36	$ 0.18	$ 0.42	$ 1.25	$ 1.08	$ 1.37