Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Geographic Information And Concentration Of Risk [Line Items]
Net sales	$ 140,614	$ 150,304	$ 153,127	$ 143,802	$ 140,031	$ 137,185	$ 135,911	$ 131,145	$ 587,847	$ 544,272	$ 490,219
Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Net sales									439,342	412,167	358,480
North America
Geographic Information And Concentration Of Risk [Line Items]
Net sales									121,144	94,123	46,152
Europe
Geographic Information And Concentration Of Risk [Line Items]
Net sales									43,580	43,378	85,587
Other: Warrant Shares
Geographic Information And Concentration Of Risk [Line Items]
Net sales offset									$ (16,219)	$ (5,396)	$ 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									75.00%	76.00%	74.00%
Net sales revenue | North America
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									21.00%	17.00%	9.00%
Net sales revenue | Europe
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									7.00%	8.00%	17.00%
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									(3.00%)	(1.00%)	(0.00%)