Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012		Dec. 31, 2011		Jan. 01, 2011
Net sales	$ 667,913		$ 664,955		$ 608,021
Cost of sales	409,446		408,261		374,149
Gross profit	258,467		256,694		233,872
Selling, general and administrative expenses	124,277		116,740		103,671
Research and development expenses	21,231		19,439		17,602
Amortization of intangibles	6,089		6,611		5,025
Total operating expenses	151,597		142,790		126,298
Operating income	106,870		113,904		107,574
Interest expense, net	1,701		1,691		1,437
Impairment and equity in net loss of unconsolidated affiliate	7,334	[1]		[1]		[1]
Other expense (income), net	(2,217)		(2,888)		(1,542)
Income before income taxes	100,052		115,101		107,679
Income taxes	24,720		28,077		29,016
Net income	$ 75,332		$ 87,024		$ 78,663
Basic (in Dollars per share)	$ 3.45		$ 3.96		$ 3.58
Diluted (in Dollars per share)	$ 3.40		$ 3.90		$ 3.52
Basic (in Shares)	21,822		21,901		21,875
Diluted (in Shares)	22,098		22,255		22,214

[1] During the fourth quarter of 2012, the company recorded approximatetly $7.3 million related to the impairment and equity in net loss of its investment in Shocking Technology. (See Note 6).