Segment Information Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2016	Oct. 25, 2015	Jul. 26, 2015	Apr. 26, 2015	Jan. 25, 2015	Oct. 26, 2014	Jul. 27, 2014	Apr. 27, 2014	Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014
Geographic Information And Concentration Of Risk [Line Items]
Net sales	$ 118,609	$ 115,810	$ 125,712	$ 130,088	$ 130,394	$ 148,890	$ 145,742	$ 132,859	$ 490,219	$ 557,885	$ 594,977
Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Net sales									358,480	412,514	432,097
Europe
Geographic Information And Concentration Of Risk [Line Items]
Net sales									85,587	60,232	68,306
North America [Member]
Geographic Information And Concentration Of Risk [Line Items]
Net sales									$ 46,152	$ 85,139	$ 94,574
Net sales revenue
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									100.00%	100.00%	100.00%
Net sales revenue | Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									73.00%	74.00%	73.00%
Net sales revenue | Europe
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									17.00%	11.00%	11.00%
Net sales revenue | North America [Member]
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									9.00%	15.00%	16.00%