Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
Consolidated Statements of Operations [Abstract]
Net sales	$ 156,411	$ 130,576	$ 435,406	$ 377,790
Cost of goods sold	96,665	81,979	272,038	238,753
Gross profit	59,746	48,597	163,368	139,037
Selling, general and administrative expenses	28,615	25,195	82,103	75,122
Income from operations	31,131	23,402	81,265	63,915
Interest expense, net	38	12	90	95
Income from continuing operations before income taxes	31,093	23,390	81,175	63,820
Provision for income taxes	11,337	8,374	30,019	22,775
Net income from continuing operations	19,756	15,016	51,156	41,045
Net income (loss) from discontinued operations	586	(3,516)	4,506	(4,412)
Net income	$ 20,342	$ 11,500	$ 55,662	$ 36,633
Basic:
Net income from continuing operations	$ 0.54	$ 0.42	$ 1.41	$ 1.15
Net income (loss) from discontinued operations	$ 0.02	$ (0.10)	$ 0.13	$ (0.13)
Net income	$ 0.56	$ 0.32	$ 1.54	$ 1.02
Diluted:
Net income from continuing operations	$ 0.54	$ 0.41	$ 1.40	$ 1.13
Net income (loss) from discontinued operations	$ 0.02	$ (0.09)	$ 0.13	$ (0.12)
Net income	$ 0.56	$ 0.32	$ 1.53	$ 1.01
Weighted Average Shares Outstanding:
Basic	36,240	35,933	36,089	35,842
Diluted	36,622	36,418	36,489	36,365