Geographic Information And Concentration of Risk (Summary Of Sales Activity To Countries Greater Than 10% Of Total Sales) (Details) (Concentration Of Total Sales [Member])	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
United States [Member]
Net sales	22.00%	22.00%	23.00%	23.00%
China (Including Hong Kong) [Member]
Net sales	39.00%	32.00%	37.00%	31.00%
South Korea [Member]
Net sales		12.00%		12.00%