Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Product sales	$ 313,855	$ 316,150	$ 600,362	$ 619,486
Service sales	137,610	131,477	271,561	255,744
Total net sales	451,465	447,627	871,923	875,230
Cost of product sales	120,321	121,280	230,033	237,181
Cost of service sales	58,938	54,823	116,516	108,751
Total cost of sales	179,259	176,103	346,549	345,932
Gross profit	272,206	271,524	525,374	529,298
Selling and administrative expenses	122,682	125,439	239,801	242,563
Research and development expenses	23,943	23,014	47,290	45,268
Purchased intangibles amortization	2,458	2,504	4,943	5,005
Litigation provision	3,000		3,000
Operating income	120,123	120,567	230,340	236,462
Interest expense	(6,878)	(5,052)	(13,369)	(9,135)
Interest income	1,031	813	1,800	1,526
Income from operations before income taxes	114,276	116,328	218,771	228,853
Provision for income taxes	16,552	16,253	32,381	34,289
Net income	$ 97,724	$ 100,075	$ 186,390	$ 194,564
Net income per basic common share	$ 1.11	$ 1.09	$ 2.10	$ 2.12
Weighted-average number of basic common shares	88,317	91,662	88,650	91,649
Net income per diluted common share	$ 1.09	$ 1.07	$ 2.08	$ 2.09
Weighted-average number of diluted common shares and equivalents	89,381	93,271	89,823	93,302