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Segment Information - Revenue by Geographic Region (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 26, 2020
Oct. 27, 2019
Jul. 28, 2019
Apr. 28, 2019
Jan. 27, 2019
Oct. 28, 2018
Jul. 29, 2018
Apr. 29, 2018
Jan. 26, 2020
Jan. 27, 2019
Jan. 28, 2018
Geographic Information And Concentration Of Risk [Line Items]                      
Net sales $ 138,001 $ 141,011 $ 137,146 $ 131,354 $ 160,006 $ 173,550 $ 163,211 $ 130,429 $ 547,512 $ 627,196 $ 587,847
Asia-Pacific                      
Geographic Information And Concentration Of Risk [Line Items]                      
Net sales                 421,584 480,680 439,342
North America                      
Geographic Information And Concentration Of Risk [Line Items]                      
Net sales                 76,652 118,664 121,144
Europe                      
Geographic Information And Concentration Of Risk [Line Items]                      
Net sales                 49,276 49,353 43,580
Other: Warrant Shares                      
Geographic Information And Concentration Of Risk [Line Items]                      
Net sales offset                 $ 0 $ (21,501) $ (16,219)
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                 77.00% 76.00% 75.00%
Net sales revenue | North America                      
Geographic Information And Concentration Of Risk [Line Items]                      
Concentration risk, percentage                 14.00% 19.00% 21.00%
Net sales revenue | Europe                      
Geographic Information And Concentration Of Risk [Line Items]                      
Concentration risk, percentage                 9.00% 8.00% 7.00%
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% (3.00%) (3.00%)