Schedule of Condensed Consolidated Statements of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 01, 2012		Jul. 03, 2011		Jul. 01, 2012		Jul. 03, 2011
Change In Accounting Principle
Net revenues	$ 548,284		$ 410,519		$ 944,952		$ 787,680
Cost of revenues	238,778		195,841		444,520		380,110
Gross profit	309,506		214,678		500,432		407,570
Engineering and development	66,532		48,392		126,667		95,536
Selling and administrative	73,366		57,880		141,143		115,611
Acquired intangible asset amortization	18,429		7,291		36,858		14,582
Total operating expenses	152,065		114,842		296,581		227,421
Income from operations	157,441		99,836		203,851		180,149
Interest income	874		1,403		1,767		2,690
Interest expense and other, net	(6,323)		(5,316)		(12,382)		(11,492)
Income from continuing operations before income taxes	151,992	[1],[2]	95,923	[1],[2]	193,236	[1],[2]	171,347	[1],[2]
Provision for income taxes	40,605		7,839		48,285		13,325
Income from continuing operations	111,387		88,084		144,951		158,022
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)			(832)				24,371
Net income	111,387		87,252		144,951		184,096
Net income per common share from continuing operations, Basic	$ 0.60		$ 0.48		$ 0.78		$ 0.85
Net income per common share from continuing operations, Diluted	$ 0.49		$ 0.38		$ 0.63		$ 0.68
Net income per common share, Basic	$ 0.60		$ 0.47		$ 0.78		$ 0.99
Net income per common share, Diluted	$ 0.49		$ 0.38		$ 0.63		$ 0.80
Weighted average common share-basic	186,573		185,367		186,205		185,044
Weighted average common share-diluted	229,646		230,452		230,399		231,266
Originally Reported
Change In Accounting Principle
Net revenues			410,519				787,680
Cost of revenues			195,433				380,185
Gross profit			215,086				407,495
Engineering and development			47,393				95,370
Selling and administrative			57,481				115,710
Acquired intangible asset amortization			7,291				14,582
Restructuring and other			1,279				1,692
Total operating expenses			113,444				227,354
Income from operations			101,642				180,141
Interest income			1,403				2,690
Interest expense and other, net			(5,316)				(11,492)
Income from continuing operations before income taxes			97,729				171,339
Provision for income taxes			7,839				13,325
Income from continuing operations			89,890				158,014
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)			(832)				24,371
Net income			89,058				183,930
Net income per common share from continuing operations, Basic			$ 0.48				$ 0.85
Net income per common share from continuing operations, Diluted			$ 0.39				$ 0.68
Net income per common share, Basic			$ 0.48				$ 0.99
Net income per common share, Diluted			$ 0.39				$ 0.80
Weighted average common share-basic			185,367				185,044
Weighted average common share-diluted			230,452				231,266
Effect Of Accounting Change
Change In Accounting Principle
Cost of revenues			408				(75)
Gross profit			(408)				75
Engineering and development			999				166
Selling and administrative			399				(99)
Total operating expenses			1,398				67
Income from operations			(1,806)				8
Income from continuing operations before income taxes			(1,806)				8
Income from continuing operations			(1,806)				8
Income from discontinued operations before income taxes							158
Income from discontinued operations							158
Net income			(1,806)				166
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
Change In Accounting Principle
Net revenues			410,519				787,680
Cost of revenues			195,841				380,110
Gross profit			214,678				407,570
Engineering and development			48,392				95,536
Selling and administrative			57,880				115,611
Acquired intangible asset amortization			7,291				14,582
Restructuring and other			1,279				1,692
Total operating expenses			114,842				227,421
Income from operations			99,836				180,149
Interest income			1,403				2,690
Interest expense and other, net			(5,316)				(11,492)
Income from continuing operations before income taxes			95,923				171,347
Provision for income taxes			7,839				13,325
Income from continuing operations			88,084				158,022
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)			(832)				24,371
Net income			$ 87,252				$ 184,096
Net income per common share from continuing operations, Basic			$ 0.48				$ 0.85
Net income per common share from continuing operations, Diluted			$ 0.38				$ 0.68
Net income per common share, Basic			$ 0.47				$ 0.99
Net income per common share, Diluted			$ 0.38				$ 0.80
Weighted average common share-basic			185,367				185,044
Weighted average common share-diluted			230,452				231,266

[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 six months ended July 1, 2012 and July 3, 2011 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows: