Acquisitions - Narrative (Pro forma Information) (Details) (USD $)		3 Months Ended	6 Months Ended
	Mar. 20, 2012	Jul. 29, 2012 Gennum [Member]	Jul. 29, 2012 Gennum [Member]
Business Acquisition [Line Items]
Pro forma adjustment, decrease in cost of goods sold		$ (17,700,000)	$ (30,600,000)
Pro forma adjustment, increase in operating expense due to settlement			4,200,000
Pro forma adjustment, (decrease) increase in amortization expense		(1,200,000)	800,000
Pro forma adjustment, decrease in income tax benefit			(23,400,000)
Pro forma adjustment, (decrease) increase in interest expense		(200,000)	2,000,000
Debt instrument, face amount	$ 350,000,000