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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 29, 2012
Apr. 29, 2012
Jul. 31, 2011
Schedule of Inventory [Line Items]      
Raw materials $ 5,917 $ 5,534  
Work-in-process 2,511 3,631  
Finished goods 35,624 27,208  
Inventories $ 44,052 $ 36,373 [1] $ 34,858
[1] Derived from audited financial statements.