Intangible Assets (Schedule Of Amortizable Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010	Dec. 31, 2010
Gross Carrying Amount	$ 227,466,000		$ 227,466,000		$ 227,466,000
Accumulated Amortization	119,109,000		119,109,000		104,525,000
Net Carrying Amount	108,357,000		108,357,000		122,941,000
Weighted Average Useful Life, Years			7.6		7.6
Aggregate intangible asset amortization expense	7,300,000	7,300,000	14,600,000	14,700,000
Developed Technology [Member]
Gross Carrying Amount	121,055,000		121,055,000		121,055,000
Accumulated Amortization	74,500,000		74,500,000		65,610,000
Net Carrying Amount	46,555,000		46,555,000		55,445,000
Weighted Average Useful Life, Years			6.1		6.1
Customer Relationships And Service And Software Maintenance Contracts [Member]
Gross Carrying Amount	91,271,000		91,271,000		91,271,000
Accumulated Amortization	38,030,000		38,030,000		32,749,000
Net Carrying Amount	53,241,000		53,241,000		58,522,000
Weighted Average Useful Life, Years			8.6		8.6
Trade Names And Trademarks [Member]
Gross Carrying Amount	14,840,000		14,840,000		14,840,000
Accumulated Amortization	6,279,000		6,279,000		5,866,000
Net Carrying Amount	8,561,000		8,561,000		8,974,000
Weighted Average Useful Life, Years			11.5		11.5
Customer Backlog [ Member ]
Gross Carrying Amount	300,000		300,000		300,000
Accumulated Amortization	$ 300,000		$ 300,000		$ 300,000
Weighted Average Useful Life, Years			0.5		0.5