Geographic Information And Concentration Of Risk (Net Sales Activity By Geographic Region) (Details) (Concentration Of Net Sales [Member])	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
Net sales	100.00%	100.00%	100.00%	100.00%
North America [Member]
Net sales	25.00%	24.00%	26.00%	25.00%
Asia-Pacific [Member]
Net sales	62.00%	60.00%	61.00%	59.00%
Europe [Member]
Net sales	13.00%	16.00%	13.00%	16.00%