Geographic Information And Concentration Of Risk (Concentration Risk Of Net Sales) (Details) (Concentration Of Sales Revenue Goods Net [Member])	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
Samsung Electronics (And Affiliates) [Member]
Concentration of risk	12.00%	12.00%	12.00%	13.00%
Frontek Technology Corp [Member]
Concentration of risk	11.00%	12.00%	11.00%	12.00%