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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
Income Tax Disclosure [Abstract]    
Non-current assets $ 11,168 $ 7,930
Non-current liabilities (533) (614)
Deferred tax assets, net $ 10,635 $ 7,316