Note 2. Cash, Cash Equivalents and Marketable Securities (Detail) - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Maturity (USD $) In Thousands, unless otherwise specified	May 04, 2013	Feb. 02, 2013
Book Value	$ 45,708	$ 53,448
Fair Value	46,236	54,019
Due in 1 Year or Less [Member]
Book Value	31,958	39,595
Fair Value	32,117	39,766
Due in Greater Than 1 Year [Member]
Book Value	13,750	13,853
Fair Value	$ 14,119	$ 14,253