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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Apr. 29, 2017
Net sales:      
Net sales $ 172,728 $ 157,146  
Long-lived assets:      
Long-lived assets 65,293   $ 66,749
United States      
Net sales:      
Sales 154,002 135,018  
Long-lived assets:      
Long-lived assets 60,248   62,425
Outside U.S.      
Net sales:      
Sales 18,726 $ 22,128  
Long-lived assets:      
Long-lived assets $ 5,045   $ 4,324