Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Income Statement [Abstract]
Net revenues	$ 253,177	$ 236,483	$ 380,244	$ 349,821
Cost of goods sold	162,417	154,205	262,502	242,620
Gross profit	90,760	82,278	117,742	107,201
Selling, general and administrative expense	53,492	49,715	98,467	93,756
Income from operations	37,268	32,563	19,275	13,445
Interest expense	120	115	232	223
Income before income taxes	37,148	32,448	19,043	13,222
Provision for income taxes	16,203	14,144	8,357	5,933
Net income	$ 20,945	$ 18,304	$ 10,686	$ 7,289
Net income per common and common equivalent share:
Basic	$ 0.85	$ 0.76	$ 0.44	$ 0.30
Diluted	$ 0.85	$ 0.75	$ 0.43	$ 0.30
Weighted average common and common equivalent shares outstanding:
Basic	24,617	24,142	24,551	24,141
Diluted	24,684	24,314	24,705	24,418