Note 8. Business Combinations (Detail) (USD $)	3 Months Ended			1 Months Ended	3 Months Ended	9 Months Ended
	May 04, 2013	Feb. 02, 2013	May 04, 2012 Additional Payment [Member] Trident Microsystems, Inc. [Member]	May 31, 2012 Trident Microsystems, Inc. [Member]	May 04, 2013 Trident Microsystems, Inc. [Member]	Oct. 27, 2012 Trident Microsystems, Inc. [Member]	May 04, 2012 Trident Microsystems, Inc. [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price					$ 38,210,000		$ 38,200,000
Business Combination, Bargain Purchase, Gain Recognized, Amount	1,389,000			1,400,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					13,500,000	1,800,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					700,000
Business Acquisition, Due from Seller	1,800,000	4,500,000
Business Acquisition, Cost of Acquired Entity, Cash Paid			$ 2,700,000