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Segment Information - International net sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 28, 2019
Jan. 27, 2019
Oct. 28, 2018
Jul. 29, 2018
Apr. 29, 2018
Jan. 28, 2018
Oct. 29, 2017
Jul. 30, 2017
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales $ 70,963 $ 77,226 $ 77,006 $ 71,473 $ 78,184 $ 85,310 $ 80,698 $ 79,533 $ 296,669 $ 323,725 $ 309,544
North america (excluding USA) [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [1]                 29,247 27,844 29,995
Far east and asia [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [2]                 39,277 40,671 34,695
All other areas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 3,712 5,681 3,618
International [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 $ 72,236 $ 74,196 $ 68,308
[1] Of this amount, $22.5 million, $21.9 million, and $22.3 million are attributable to shipments to Mexico in fiscal 2019, 2018, and 2017, respectively.
[2] Of this amount $29.8 million, $32.6 million, and $26.6 million are attributable to shipments to China in fiscal 2019, 2018, and 2017, respectively.