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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 9 Months Ended
Jan. 25, 2014
Jan. 26, 2013
Jan. 25, 2014
Jan. 26, 2013
Apr. 27, 2013
Net sales:          
Net sales $ 115,369 $ 111,050 $ 415,730 $ 393,840  
Long-lived assets:          
Long-lived assets 62,676   62,676   61,625
United States
         
Net sales:          
Sales 94,454 89,300 343,536 330,995  
Long-lived assets:          
Long-lived assets 58,481   58,481   60,060
Outside U.S.
         
Net sales:          
Sales 20,915 21,750 72,194 62,845  
Long-lived assets:          
Long-lived assets $ 4,195   $ 4,195   $ 1,565