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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 28, 2018
Jul. 29, 2017
Apr. 28, 2018
Net sales:      
Net sales $ 154,188 $ 172,728  
Long-lived assets:      
Long-lived assets 67,290   $ 68,059
United States      
Net sales:      
Sales 121,697 155,438  
Long-lived assets:      
Long-lived assets 60,356   61,206
Outside United States      
Net sales:      
Sales 32,491 $ 17,289  
Long-lived assets:      
Long-lived assets $ 6,934   $ 6,853