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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Aug. 02, 2014
Jul. 27, 2013
Apr. 26, 2014
Net sales:      
Net sales $ 166,618 $ 138,722  
Long-lived assets:      
Long-lived assets 69,504   65,270
United States
     
Net sales:      
Sales 141,830 115,770  
Long-lived assets:      
Long-lived assets 65,325   60,846
Outside U.S.
     
Net sales:      
Sales 24,788 22,952  
Long-lived assets:      
Long-lived assets $ 4,179   $ 4,424