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	12 Months Ended
	Apr. 28, 2013	Jan. 27, 2013
Geographic Information And Concentration Of Risk [Line Items]
Minimum concentration risk threshold	10.00%
Samsung Electronics (And Affiliates) [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	13.00%	12.00%
Huawei Technologies Co. (And Affiliates) [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	14.00%	14.00%