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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 27, 2013
Apr. 28, 2013
Oct. 28, 2012
Inventory [Line Items]      
Raw materials $ 5,592 $ 5,311 $ 5,884
Work-in-process 2,383 2,539 2,789
Finished goods 36,907 30,568 29,588
Inventories $ 44,882 $ 38,418 [1] $ 38,261
[1] Derived from audited financial statements.