Goodwill and Intangible Assets - Schedule of Fair Value of Core Technologies (Details) (Developed technology, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 27, 2013
Gennum
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, fair value	$ 95,100
Gennum | Underlying intellectual property - Clock and data recovery
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, fair value	31,000
Estimated useful life	8 years
Gennum | Video broadcast and surveillance
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, fair value	39,000
Gennum | Optical communication
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, fair value	21,000
Estimated useful life	6 years
Gennum | Other
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, fair value	$ 4,100
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	2 years
Minimum | Gennum | Video broadcast and surveillance
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	7 years
Minimum | Gennum | Other
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Maximum | Gennum | Video broadcast and surveillance
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years
Maximum | Gennum | Other
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	7 years