Geographic Information and Concentration of Risk (Schedule Of Significant Customers Having An Outstanding Receivable Balance That Represents At Least 10% Of Total Net) (Details) (Accounts Receivable [Member])	3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Oct. 28, 2012	Oct. 28, 2012 Samsung Electronics (And Affiliates) [Member]	Jan. 29, 2012 Samsung Electronics (And Affiliates) [Member]	Oct. 28, 2012 Huawei Technologies Co. (And Affiliates) [Member]	Jan. 29, 2012 Huawei Technologies Co. (And Affiliates) [Member]	Oct. 28, 2012 Frontek Technology Corp [Member]	Jan. 29, 2012 Frontek Technology Corp [Member]	Oct. 28, 2012 Dragon Technology Co. [Member]	Jan. 29, 2012 Dragon Technology Co. [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage		14.00%	14.00%	12.00%	11.00%		10.00%		11.00%
Minimum concentration risk threshold	10.00%