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Inventories (Detail) - USD ($)
$ in Thousands
Jul. 29, 2018
Apr. 29, 2018
Jul. 30, 2017
Inventory Disclosure [Abstract]      
Raw materials $ 5,291 $ 6,024 $ 6,956
Work-in-process 2,413 3,264 2,782
Finished goods 47,285 44,166 45,489
Inventories $ 54,989 $ 53,454 [1] $ 55,227
[1] Derived from audited financial statements.