Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Net sales
Net sales of tangible products	$ 241,686	$ 218,271	$ 700,568	$ 627,482
Revenue from services and software	11,652	11,536	35,612	32,858
Total net sales	253,338	229,807	736,180	660,340
Cost of sales
Cost of sales of tangible products	122,529	114,924	351,042	338,080
Cost of services and software	7,256	5,636	19,889	15,841
Total cost of sales	129,785	120,560	370,931	353,921
Gross profit	123,553	109,247	365,249	306,419
Operating expenses:
Selling and marketing	31,942	28,068	91,420	80,423
Research and development	22,584	21,862	66,752	60,839
General and administrative	19,166	18,147	62,560	55,420
Amortization of intangible assets	843	839	2,514	2,320
Exit and restructuring costs	138	0	2,090	2,232
Total operating expenses	74,673	68,916	225,336	201,234
Operating income	48,880	40,331	139,913	105,185
Other income (expense):
Investment income	134	635	1,350	2,111
Foreign exchange gain (loss)	(173)	(148)	(1,300)	444
Other, net	(859)	(160)	(1,356)	(885)
Total other income (expense)	(898)	327	(1,306)	1,670
Income before income taxes	47,982	40,658	138,607	106,855
Income taxes	13,795	13,411	41,123	31,876
Income from continuing operations	34,187	27,247	97,484	74,979
Income (loss) from discontinued operations, net of tax	10,814	(1,096)	42,115	(1,418)
Net income	$ 45,001	$ 26,151	$ 139,599	$ 73,561
Basic earnings per share:
Income from continuing operations	$ 0.64	$ 0.48	$ 1.79	$ 1.30
Income (loss) from discontinued operations	$ 0.20	$ (0.02)	$ 0.77	$ (0.02)
Net income	$ 0.84	$ 0.46	$ 2.56	$ 1.28
Diluted earnings per share:
Income from continuing operations	$ 0.64	$ 0.48	$ 1.78	$ 1.30
Income (loss) from discontinued operations	$ 0.20	$ (0.02)	$ 0.77	$ (0.02)
Net income	$ 0.84	$ 0.46	$ 2.55	$ 1.28
Basic weighted average shares outstanding	53,339	56,739	54,405	57,405
Diluted weighted average and equivalent shares outstanding	53,628	56,998	54,770	57,657