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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2014
Apr. 28, 2013
Inventory Disclosure [Abstract]    
raw materials $ 6,707 $ 5,311
work-in-process 2,263 2,539
finished goods 31,704 30,568
inventories $ 40,674 $ 38,418