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Income Taxes - Deferred Tax Assets and Liabilities Current and Non Current (Details) - USD ($)
$ in Thousands
Apr. 29, 2017
Apr. 30, 2016
Income Tax Disclosure [Abstract]    
Non-current assets $ 11,292 $ 9,437
Non-current liabilities (836) (754)
Deferred tax assets, net $ 10,456 $ 8,683