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Investments in Affiliates (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 28, 2018
Jul. 29, 2017
Apr. 28, 2018
Equity and Cost Method Investments [Abstract]      
Equity Method Investments $ 3,939   $ 3,647
Equity in loss of affiliate (134) $ (85)  
Cost Method Investments $ 42   $ 42