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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 26, 2013
Apr. 28, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 22,494 $ 24,880
Work-in-process 7,774 10,581
Finished goods 19,310 19,463
Inventories $ 49,578 $ 54,924