Note 8. Business Combinations (Detail) - Valuation of Assets Acquired (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended			1 Months Ended			3 Months Ended
	Jul. 28, 2012	Oct. 27, 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]	May 31, 2012 Trident Microsystems, Inc. [Member]	Jul. 28, 2012 Trident Microsystems, Inc. [Member]	May 04, 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]	Mar. 21, 2011 Acquisition of Computer Manufacturer [Member]
Cash							$ 39,740				$ 5,000	$ 5,000
Net tangible assets							40,019				752
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	$ 21,000			$ 5,000