Schedule of Condensed Consolidated Statements of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Oct. 02, 2011		Sep. 30, 2012		Oct. 02, 2011
Change In Accounting Principle
Net revenues	$ 463,394		$ 344,389		$ 1,408,346		$ 1,132,069
Cost of revenues	203,194		174,015		647,714		554,125
Gross profit	260,200		170,374		760,632		577,944
Engineering and development	63,055		45,896		189,722		141,432
Selling and administrative	69,921		54,775		211,064		170,386
Acquired intangible asset amortization	18,429		6,754		55,287		21,336
Total operating expenses	152,088		108,890		448,669		336,311
Income from operations	108,112		61,484		311,963		241,633
Interest income	1,067		3,049		2,834		5,739
Interest expense and other, net	(6,154)		(6,068)		(18,536)		(17,560)
Income before income taxes	103,025	[1],[2]	58,465	[1],[2]	296,261	[1],[2]	229,812	[1],[2]
Provision for income taxes	14,384		1,759		62,669		15,084
Income from continuing operations	88,641		56,706		233,592		214,728
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)							24,371
Net income	88,641		56,706		233,592		240,802
Net income per common share from continuing operations, Basic	$ 0.47		$ 0.31		$ 1.25		$ 1.16
Net income per common share from continuing operations, Diluted	$ 0.39		$ 0.26		$ 1.02		$ 0.94
Net income per common share, Basic	$ 0.47		$ 0.31		$ 1.25		$ 1.30
Net income per common share, Diluted	$ 0.39		$ 0.26		$ 1.02		$ 1.06
Weighted average common share-basic	187,364		185,102		186,592		185,063
Weighted average common share-diluted	229,210		221,892		230,003		228,141
Originally Reported
Change In Accounting Principle
Net revenues			344,389				1,132,069
Cost of revenues			174,544				554,729
Gross profit			169,845				577,340
Engineering and development			46,799				142,169
Selling and administrative			55,304				171,014
Acquired intangible asset amortization			6,754				21,336
Restructuring and other			1,465				3,157
Total operating expenses			110,322				337,676
Income from operations			59,523				239,664
Interest income			3,049				5,739
Interest expense and other, net			(6,068)				(17,560)
Income before income taxes			56,504				227,843
Provision for income taxes			1,759				15,084
Income from continuing operations							212,759
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)							24,371
Net income			54,745				238,675
Net income per common share from continuing operations, Basic							$ 1.15
Net income per common share from continuing operations, Diluted							$ 0.93
Net income per common share, Basic			$ 0.30				$ 1.29
Net income per common share, Diluted			$ 0.25				$ 1.05
Weighted average common share-basic			185,102				185,063
Weighted average common share-diluted			221,892				228,141
Effect Of Accounting Change
Change In Accounting Principle
Cost of revenues			(529)				(604)
Gross profit			529				604
Engineering and development			(903)				(737)
Selling and administrative			(529)				(628)
Total operating expenses			(1,432)				(1,365)
Income from operations			1,961				1,969
Income before income taxes			1,961				1,969
Income from continuing operations							1,969
Income from discontinued operations before income taxes							158
Income from discontinued operations							158
Net income			1,961				2,127
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				$ 0.01
Net income per common share, Diluted			$ 0.01				$ 0.01
As Adjusted
Change In Accounting Principle
Net revenues			344,389				1,132,069
Cost of revenues			174,015				554,125
Gross profit			170,374				577,944
Engineering and development			45,896				141,432
Selling and administrative			54,775				170,386
Acquired intangible asset amortization			6,754				21,336
Restructuring and other			1,465				3,157
Total operating expenses			108,890				336,311
Income from operations			61,484				241,633
Interest income			3,049				5,739
Interest expense and other, net			(6,068)				(17,560)
Income before income taxes			58,465				229,812
Provision for income taxes			1,759				15,084
Income from continuing operations							214,728
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)							24,371
Net income			$ 56,706				$ 240,802
Net income per common share from continuing operations, Basic							$ 1.16
Net income per common share from continuing operations, Diluted							$ 0.94
Net income per common share, Basic			$ 0.31				$ 1.30
Net income per common share, Diluted			$ 0.26				$ 1.06
Weighted average common share-basic			185,102				185,063
Weighted average common share-diluted			221,892				228,141

[1] Pension and post retirement actuarial gains and losses, 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 and credits for the three and nine months ended September 30, 2012 and October 2, 2011 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows: