Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net revenues	$ 236,750	$ 243,572	$ 350,994	$ 365,040
Cost of goods sold	154,189	157,719	243,490	249,687
Gross profit	82,561	85,853	107,504	115,353
Selling, general and administrative expense	44,797	47,415	84,678	87,318
Restructuring costs (recoveries)	(1)	150	(4)	155
Income from operations	37,765	38,288	22,830	27,880
Interest expense	114	224	223	444
Income before income taxes	37,651	38,064	22,607	27,436
Provision for income taxes	15,342	15,448	9,279	11,067
Net income	$ 22,309	$ 22,616	$ 13,328	$ 16,369
Net income per common and common equivalent share:
Basic	$ 0.92	$ 0.97	$ 0.55	$ 0.71
Diluted	$ 0.91	$ 0.95	$ 0.54	$ 0.69
Weighted average common and common equivalent shares outstanding:
Basic	24,248	23,249	24,098	23,131
Diluted	24,587	23,720	24,476	23,652