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Goodwill and Intangible Assets -Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Impairment of intangible assets $ 830 $ 0 $ 0
Amortization of Intangible Assets $ 2,546 $ 295 $ 204