Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 26, 2020	Jan. 27, 2019
Geographic Information And Concentration Of Risk [Line Items]
Net sales	$ 595,117	$ 547,512	$ 627,196
Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Net sales	474,040	421,584	480,680
North America
Geographic Information And Concentration Of Risk [Line Items]
Net sales	71,866	76,652	118,664
Europe
Geographic Information And Concentration Of Risk [Line Items]
Net sales	49,211	49,276	49,353
Other: Warrant Shares
Geographic Information And Concentration Of Risk [Line Items]
Net sales offset	$ 0	$ 0	$ (21,501)
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	80.00%	77.00%	76.00%
Net sales revenue | North America
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	12.00%	14.00%	19.00%
Net sales revenue | Europe
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage	8.00%	9.00%	8.00%
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	0.00%	0.00%	(3.00%)