Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Oct. 25, 2015	Jul. 26, 2015	Apr. 26, 2015	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Geographic Information And Concentration Of Risk [Line Items]
Net sales	$ 140,031	$ 137,185	$ 135,911	$ 131,145	$ 118,609	$ 115,810	$ 125,712	$ 130,088	$ 544,272	$ 490,219	$ 557,885
Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Net sales									412,167	358,480	412,514
Europe
Geographic Information And Concentration Of Risk [Line Items]
Net sales									43,378	85,587	60,232
North America
Geographic Information And Concentration Of Risk [Line Items]
Net sales									94,123	46,152	85,139
Other: Warrant Shares
Geographic Information And Concentration Of Risk [Line Items]
Net sales offset									$ (5,396)	$ 0	$ 0
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									76.00%	74.00%	74.00%
Net sales revenue | Europe
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									8.00%	17.00%	11.00%
Net sales revenue | North America
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									17.00%	9.00%	15.00%
Net sales revenue | Other: Warrant Shares
Geographic Information And Concentration Of Risk [Line Items]
Allocated share-based compensation expense as a percentage of net revenue									(1.00%)	(0.00%)	(0.00%)