Intangible Assets (Schedule Of Amortizable Intangible Assets) (Details) (USD $)	3 Months Ended		12 Months Ended
	Apr. 01, 2012 Y	Apr. 03, 2011	Dec. 31, 2011 Y
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 537,966,000		$ 537,966,000
Accumulated Amortization	163,420,000		144,991,000
Net Carrying Amount	374,546,000		392,975,000
Weighted Average Useful Life, years	7.0		7.0
Aggregate intangible asset amortization expense	18,400,000	7,300,000
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	358,155,000		358,155,000
Accumulated Amortization	104,378,000		91,391,000
Net Carrying Amount	253,777,000		266,764,000
Weighted Average Useful Life, years	6.3		6.3
Customer Relationships And Service And Software Maintenance Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	144,971,000		144,971,000
Accumulated Amortization	49,788,000		45,230,000
Net Carrying Amount	95,183,000		99,741,000
Weighted Average Useful Life, years	8.0		8.0
Trade Names And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,840,000		33,840,000
Accumulated Amortization	8,254,000		7,370,000
Net Carrying Amount	25,586,000		26,470,000
Weighted Average Useful Life, years	9.0		9.0
Customer Backlog [Member ]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,000,000		1,000,000
Accumulated Amortization	1,000,000		1,000,000
Net Carrying Amount
Weighted Average Useful Life, years	0.4		0.4