Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Net sales:
Net sales of tangible products	$ 232,762	$ 207,748	$ 458,882	$ 409,211
Revenue from services and software	12,779	10,810	23,960	21,322
Total net sales	245,541	218,558	482,842	430,533
Cost of sales:
Cost of sales of tangible products	117,732	114,081	228,513	223,156
Cost of services and software	6,111	5,068	12,633	10,205
Total cost of sales	123,843	119,149	241,146	233,361
Gross profit	121,698	99,409	241,696	197,172
Operating expenses:
Selling and marketing	30,950	27,682	59,478	52,355
Research and development	22,487	20,653	44,168	38,977
General and administrative	20,688	17,955	43,394	37,273
Amortization of intangible assets	836	740	1,671	1,481
Exit and restructuring costs	66	466	1,952	2,232
Total operating expenses	75,027	67,496	150,663	132,318
Operating income	46,671	31,913	91,033	64,854
Other income (expense):
Investment income	656	634	1,216	1,476
Foreign exchange gain (loss)	(833)	424	(1,127)	592
Other, net	(243)	(455)	(497)	(725)
Total other income (expense)	(420)	603	(408)	1,343
Income before income taxes	46,251	32,516	90,625	66,197
Income taxes	13,082	10,331	27,328	18,465
Income from continuing operations	33,169	22,185	63,297	47,732
Income (loss) from discontinued operations, net of tax	(205)	492	31,301	(322)
Net income	$ 32,964	$ 22,677	$ 94,598	$ 47,410
Basic earnings per share:
Income from continuing operations	$ 0.60	$ 0.38	$ 1.15	$ 0.83
Income (loss) from discontinued operations	$ 0.00	$ 0.01	$ 0.57	$ (0.01)
Net income	$ 0.60	$ 0.39	$ 1.72	$ 0.82
Diluted earnings per share:
Income from continuing operations	$ 0.60	$ 0.38	$ 1.14	$ 0.83
Income (loss) from discontinued operations	$ 0.00	$ 0.01	$ 0.57	$ (0.01)
Net income	$ 0.60	$ 0.39	$ 1.71	$ 0.82
Basic weighted average shares outstanding	54,546	57,489	54,981	57,756
Diluted weighted average and equivalent shares outstanding	54,958	57,737	55,395	58,003