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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Apr. 28, 2018
Net sales:          
Net sales $ 172,692 $ 169,309 $ 326,880 $ 342,037  
Long-lived assets:          
Long-lived assets 69,470   69,470   $ 68,059
United States          
Net sales:          
Sales 146,377 145,034 268,074 300,472  
Long-lived assets:          
Long-lived assets 61,665   61,665   61,206
Outside United States          
Net sales:          
Sales 26,315 $ 24,275 58,806 $ 41,565  
Long-lived assets:          
Long-lived assets $ 7,805   $ 7,805   $ 6,853