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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 27, 2013
Apr. 29, 2012
Jan. 29, 2012
Schedule of Inventory [Line Items]      
Raw materials $ 6,037 $ 5,534  
Work-in-process 2,772 3,631  
Finished goods 33,368 27,208  
Inventories $ 42,177 $ 36,373 [1] $ 32,910
[1] Derived from audited financial statements.