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	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jul. 28, 2013	Jul. 28, 2013 Samsung Electronics (And Affiliates) [Member]	Jan. 27, 2013 Samsung Electronics (And Affiliates) [Member]	Jul. 28, 2013 Huawei Technologies Co. (And Affiliates) [Member]	Jan. 27, 2013 Huawei Technologies Co. (And Affiliates) [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage		12.00%	12.00%	11.00%	14.00%
Minimum concentration risk threshold	10.00%