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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 30, 2016
Aug. 01, 2015
Apr. 30, 2016
Net sales:      
Net sales $ 157,146 $ 150,221  
Long-lived assets:      
Long-lived assets 71,042   $ 73,163
United States      
Net sales:      
Sales 135,018 119,867  
Long-lived assets:      
Long-lived assets 66,386   68,233
Outside U.S.      
Net sales:      
Sales 22,128 $ 30,354  
Long-lived assets:      
Long-lived assets $ 4,656   $ 4,930