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Goodwill and Intangible Assets -Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of Intangible Assets $ 2,157 $ 1,330 $ 2,546