Change In Accounting Principle (Schedule Of Condensed Consolidated Statements Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012		Apr. 03, 2011
Change in Accounting Principle [Line Items]
Net revenues	$ 396,668		$ 377,161
Cost of revenues	205,742		184,269
Gross profit	190,926		192,892
Engineering and development	60,135		47,144
Selling and administrative	67,777		57,731
Acquired intangible asset amortization	18,429		7,291
Restructuring and other	(1,825)		413
Total operating expenses	144,516		112,579
Income from operations	46,410		80,313
Interest income	893		1,287
Interest expense and other, net	(6,059)		(6,176)
Income from continuing operations before income taxes	41,244	[1],[2]	75,424	[1],[2]
Provision for income taxes	7,680		5,486
Income from continuing operations	33,564		69,938
Income from discontinued operations before income taxes			1,436
Benefit from income taxes			(267)
Income from discontinued operations			1,703
Gain on disposal of discontinued operations (net of tax of $4,578)			25,203
Net income	33,564		96,844
Net income per common share from continuing operations, Basic	$ 0.18		$ 0.38
Net income per common share from continuing operations, Diluted	$ 0.15		$ 0.30
Net income per common share, Basic	$ 0.18		$ 0.52
Net income per common share, Diluted	$ 0.15		$ 0.42
Weighted average common share-basic	185,838		184,720
Weighted average common share-diluted	231,153		232,080
Gain on disposal of discontinued operations, tax			4,578
Originally Reported [Member]
Change in Accounting Principle [Line Items]
Net revenues			377,161
Cost of revenues			184,752
Gross profit			192,409
Engineering and development			47,977
Selling and administrative			58,229
Acquired intangible asset amortization			7,291
Restructuring and other			413
Total operating expenses			113,910
Income from operations			78,499
Interest income			1,287
Interest expense and other, net			(6,176)
Income from continuing operations before income taxes			73,610
Provision for income taxes			5,486
Income from continuing operations			68,124
Income from discontinued operations before income taxes			1,278
Benefit from income taxes			(267)
Income from discontinued operations			1,545
Gain on disposal of discontinued operations (net of tax of $4,578)			25,203
Net income			94,872
Net income per common share from continuing operations, Basic			$ 0.37
Net income per common share from continuing operations, Diluted			$ 0.29
Net income per common share, Basic			$ 0.51
Net income per common share, Diluted			$ 0.41
Weighted average common share-basic			184,720
Weighted average common share-diluted			232,080
Effect Of Accounting Change [Member]
Change in Accounting Principle [Line Items]
Cost of revenues			(483)
Gross profit			483
Engineering and development			(833)
Selling and administrative			(498)
Total operating expenses			(1,331)
Income from operations			1,814
Income from continuing operations before income taxes			1,814
Income from continuing operations			1,814
Income from discontinued operations before income taxes			158
Income from discontinued operations			158
Net income			1,972
Net income per common share from continuing operations, Basic			$ 0.01
Net income per common share from continuing operations, Diluted			$ 0.01
Net income per common share, Basic			$ 0.01
Net income per common share, Diluted			$ 0.01
As Adjusted [Member]
Change in Accounting Principle [Line Items]
Net revenues			377,161
Cost of revenues			184,269
Gross profit			192,892
Engineering and development			47,144
Selling and administrative			57,731
Acquired intangible asset amortization			7,291
Restructuring and other			413
Total operating expenses			112,579
Income from operations			80,313
Interest income			1,287
Interest expense and other, net			(6,176)
Income from continuing operations before income taxes			75,424
Provision for income taxes			5,486
Income from continuing operations			69,938
Income from discontinued operations before income taxes			1,436
Benefit from income taxes			(267)
Income from discontinued operations			1,703
Gain on disposal of discontinued operations (net of tax of $4,578)			25,203
Net income			$ 96,844
Net income per common share from continuing operations, Basic			$ 0.38
Net income per common share from continuing operations, Diluted			$ 0.30
Net income per common share, Basic			$ 0.52
Net income per common share, Diluted			$ 0.42
Weighted average common share-basic			184,720
Weighted average common share-diluted			232,080

[1] Interest income and interest expense and other are included in Corporate and Eliminations.

[2] Included in the income (loss) from continuing operations before income taxes for each of the segments are charges for the three months ended April 1, 2012 and April 3, 2011 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows: