Note 8. Acquisitions (Detail) - Valuation of the Assets Acquired (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended			6 Months Ended	3 Months Ended
	Jul. 28, 2012	Jul. 28, 2012	Apr. 30, 2011 Technology [Member] Acquisition of Computer Manufacturer [Member] Developed Technology Rights [Member]	Apr. 30, 2011 Technology Leveraged [Member] Acquisition of Computer Manufacturer [Member] Developed Technology Rights [Member]	Jul. 28, 2012 Trident Microsystems, Inc. [Member] Developed Technology Rights [Member]	Jul. 28, 2012 Trident Microsystems, Inc. [Member]	Apr. 30, 2011 Acquisition of Computer Manufacturer [Member] Customer Relationships [Member]	Apr. 30, 2011 Acquisition of Computer Manufacturer [Member] In-process research and development [Member]	Apr. 30, 2011 Acquisition of Computer Manufacturer [Member]
Purchase consideration:
Cash						$ 39,740			$ 5,000
Net tangible assets						40,019			752
Identifiable intangible assets:
Identifiable intangible assets - Amount			1,250	1,680	1,138		750	370
Identifiable intangible assets - Estimated useful life			5 years	8 years	3 years		5 years
Goodwill									198
Gain on acquisition	(1,417)	(1,417)				(1,400)
Total consideration						$ 39,740			$ 5,000