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Income Taxes - Deferred Tax Assets and Liabilities Current and Non Current (Details) - USD ($) $ in Thousands | Apr. 27, 2019 | Apr. 28, 2018
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Income Tax Disclosure [Abstract] |  |
Non-current assets | $ 11,168 | $ 7,930
Non-current liabilities | (533) | (614)
Deferred tax assets, net | $ 10,635 | $ 7,316

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