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Inventories (Detail) - USD ($)
$ in Thousands
Jan. 29, 2017
May 01, 2016
Jan. 31, 2016
Inventory Disclosure [Abstract]      
Raw materials $ 6,977 $ 5,462 $ 6,831
Work-in-process 3,161 2,972 3,365
Finished goods 36,055 38,097 38,289
Inventories $ 46,193 $ 46,531 [1] $ 48,485
[1] Derived from audited financial statements.