Segment Information - International Net Sales (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 02, 2021	May 03, 2020	Apr. 28, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales		$ 299,720	$ 256,166	$ 281,325
North America (Excluding USA) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales	[1]	32,925	27,637	29,247
Far East and Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales	[2]	43,764	36,470	39,277
All Other Areas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales		5,558	2,986	3,712
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales		$ 82,247	$ 67,093	$ 72,236

[1] Of this amount, $27.2 million, $21.7 million, and $22.5 million are attributable to shipments to Mexico in fiscal 2021, 2020, and 2019, respectively.

[2] Of this amount $28.1 million, $21.4 million, and $29.8 million are attributable to shipments to China in fiscal 2021, 2020, and 2019, respectively.