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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
Nov. 01, 2014
Oct. 26, 2013
Nov. 01, 2014
Oct. 26, 2013
Apr. 26, 2014
Net sales:          
Net sales $ 173,115 $ 161,639 $ 339,733 $ 300,361  
Long-lived assets:          
Long-lived assets 71,425   71,425   65,270
United States
         
Net sales:          
Sales 138,211 133,312 280,041 249,082  
Long-lived assets:          
Long-lived assets 66,147   66,147   60,846
Outside U.S.
         
Net sales:          
Sales 34,904 28,327 59,692 51,279  
Long-lived assets:          
Long-lived assets $ 5,278   $ 5,278   $ 4,424