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Inventories (Detail) - USD ($)
$ in Thousands
Jan. 27, 2019
Apr. 29, 2018
Jan. 28, 2018
Inventory Disclosure [Abstract]      
Raw materials $ 5,745 $ 6,024 $ 6,654
Work-in-process 2,610 3,264 3,151
Finished goods 47,060 44,166 45,846
Inventories $ 55,415 $ 53,454 [1] $ 55,651
[1] Derived from audited financial statements.