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Inventories (Detail) - USD ($)
$ in Thousands
Oct. 28, 2018
Apr. 29, 2018
Oct. 29, 2017
Inventory Disclosure [Abstract]      
Raw materials $ 5,397 $ 6,024 $ 6,617
Work-in-process 2,082 3,264 2,686
Finished goods 43,122 44,166 40,906
Inventories $ 50,601 $ 53,454 [1] $ 50,209
[1] Derived from audited financial statements.