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. 26, 2014	Jan. 27, 2013
Geographic Information And Concentration Of Risk [Line Items]
Minimum concentration risk threshold	10.00%
Samsung Electronics Co., Ltd.(and affiliates)
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	13.00%	12.00%
Huawei Technologies (and affiliates)
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	9.00%	14.00%