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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 6 Months Ended
Oct. 26, 2013
Oct. 27, 2012
Oct. 26, 2013
Oct. 27, 2012
Apr. 27, 2013
Net sales:          
Net sales $ 161,639 $ 149,871 $ 300,361 $ 282,790  
Long-lived assets:          
Long-lived assets 63,016   63,016   61,625
United States
         
Net sales:          
Sales 132,950 125,835 248,402 241,494  
Long-lived assets:          
Long-lived assets 58,730   58,730   60,060
Outside U.S.
         
Net sales:          
Sales 28,689 24,036 51,959 41,296  
Long-lived assets:          
Long-lived assets $ 4,286   $ 4,286   $ 1,565