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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 |
--- | --- | --- | ---
Jan. 27, 2018 | Jan. 28, 2017 | Jan. 27, 2018 | Jan. 28, 2017 | Apr. 29, 2017
Net sales: |  |  |  |  |
Net sales | $ 130,316 | $ 115,719 | $ 472,353 | $ 442,857 |
Long-lived assets: |  |  |  |  |
Long-lived assets | 64,295 |  | 64,295 |  | $ 66,749
United States |  |  |  |  |
Net sales: |  |  |  |  |
Sales | 98,297 | 94,174 | 396,155 | 363,766 |
Long-lived assets: |  |  |  |  |
Long-lived assets | 58,333 |  | 58,333 |  | 62,425
Outside United States |  |  |  |  |
Net sales: |  |  |  |  |
Sales | 32,019 | $ 21,545 | 76,198 | $ 79,091 |
Long-lived assets: |  |  |  |  |
Long-lived assets | $ 5,962 |  | $ 5,962 |  | $ 4,324

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