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Income Taxes - Deferred Tax Assets and Liabilities Current and Non Current (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Apr. 29, 2017
Income Tax Disclosure [Abstract]    
Non-current assets $ 7,930 $ 11,292
Non-current liabilities (614) (836)
Deferred tax assets, net $ 7,316 $ 10,456