Geographic Information and Concentration of Risk - Schedule of Significant Customers Having an Outstanding Receivable Balance that Represents at Least 10% of Total Net Receivables (Details) (Accounts receivable)	12 Months Ended
	Jan. 27, 2013	Jan. 29, 2012
Geographic Information And Concentration Of Risk [Line Items]
Minimum concentration risk threshold	10.00%
Samsung Electronics (and affiliates)
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	12.00%	14.00%
Huawei Technologies (and affiliates)
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	14.00%	11.00%
Frontek Technology Corp
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	4.00%	10.00%
Dragon Technology
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	3.00%	11.00%