Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Revenues:
Product	$ 158,357	$ 177,751	$ 294,828	$ 319,487
Service	42,594	43,331	85,801	80,113
Total revenues	200,951	221,082	380,629	399,600
Costs and expenses:
Cost of product revenues	99,973	106,441	191,312	194,239
Cost of service revenues	21,781	23,325	44,195	45,752
Research and development	20,431	22,858	40,440	40,674
Selling, general and administrative	61,412	66,052	127,419	120,295
Impairment of goodwill	26,589		41,514
Gain on sale of assets	(1,255)		(2,655)
Acquisition costs		373		5,211
Restructuring costs	5,598	5,111	5,598	5,111
Total costs and expenses	234,529	224,160	447,823	411,282
Operating loss	(33,578)	(3,078)	(67,194)	(11,682)
Interest income	80	306	201	403
Interest expense	(882)	(883)	(1,632)	(1,393)
Loss before income taxes	(34,380)	(3,655)	(68,625)	(12,672)
Income tax expense (benefit)	3,142	141	210,987	(2,798)
Net loss	$ (37,522)	$ (3,796)	$ (279,612)	$ (9,874)
Loss per common share:
Basic loss per share	$ (0.62)	$ (0.06)	$ (4.65)	$ (0.16)
Diluted loss per share	$ (0.62)	$ (0.06)	$ (4.65)	$ (0.16)
Shares used in computing:
Basic loss per share	60,251,466	59,784,479	60,140,033	60,070,394
Diluted loss per share	60,251,466	59,784,479	60,140,033	60,070,394