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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 01, 2020
Jan. 26, 2019
Feb. 01, 2020
Jan. 26, 2019
Apr. 27, 2019
Net sales:          
Net sales $ 127,657 $ 115,069 $ 482,824 $ 441,949  
Long-lived assets:          
Long-lived assets 66,368   66,368   $ 65,314
United States          
Net sales:          
Net sales 103,347 94,418 399,913 361,679  
Long-lived assets:          
Long-lived assets 58,414   58,414   59,192
Outside United States          
Net sales:          
Net sales 24,310 $ 20,651 82,911 $ 80,270  
Long-lived assets:          
Long-lived assets $ 7,954   $ 7,954   $ 6,122