Segment Information - Revenue by Country (Details) - Net sales revenue	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	64.00%	67.00%	61.00%
China Including Hong Kong [Member] | Geographic Concentration Risk [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	48.00%	47.00%	38.00%
United States | Geographic Concentration Risk [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	9.00%	12.00%	12.00%
Japan | Geographic Concentration Risk [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	7.00%	8.00%	11.00%