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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 27, 2012
Apr. 28, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 26,524 $ 24,880
Work-in-process 7,523 10,581
Finished goods 19,783 19,463
Inventories $ 53,830 $ 54,924