Summary of Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Summary of Quarterly Financial Data (unaudited) [Abstract]
Net sales	$ 220,559	$ 246,817	$ 205,219	$ 262,383	$ 189,073	$ 199,600	$ 161,462	$ 193,068	$ 934,978	$ 743,203	$ 605,676
Gross profit	139,947	160,729	131,571	164,299	118,978	125,762	102,504	123,101	596,546	470,345	378,263
Operating income	19,414	40,225	25,852	34,296	19,970	26,459	17,626	26,398	119,787	90,453	52,383
Net income	$ 12,495	$ 26,209	$ 16,973	$ 22,417	$ 15,370	$ 17,236	$ 11,289	$ 16,583	$ 78,094	$ 60,478	$ 31,568
Net income per share – diluted	$ 0.22	$ 0.46	$ 0.30	$ 0.39	$ 0.27	$ 0.31	$ 0.20	$ 0.30	$ 1.37	$ 1.07	$ 0.57