Geographic Information and Concentration of Risk (Schedule Of Significant Customers Having An Outstanding Receivable Balance That Represents At Least 10% Of Total Net) (Details)	6 Months Ended	12 Months Ended
	Jul. 29, 2012	Jan. 29, 2012
Huawei Technologies Co. (And Affiliates) [Member]
Geographic Information And Concentration Of Risk [Line Items]
Percentage of net accounts receivable	15.00%	11.00%
Samsung Electronics (And Affiliates) [Member]
Geographic Information And Concentration Of Risk [Line Items]
Percentage of net accounts receivable	11.00%	14.00%
Frontek Technology Corp [Member]
Geographic Information And Concentration Of Risk [Line Items]
Percentage of net accounts receivable		10.00%
Dragon Technology Co. [Member]
Geographic Information And Concentration Of Risk [Line Items]
Percentage of net accounts receivable		11.00%