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Intangible Assets - Summary of Change in Carrying Amount of Finite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
9 Months Ended
Jan. 27, 2019
Jan. 28, 2018
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Beginning balance $ 2,839 $ 664
Amortization expense (226) (39)
Ending balance 2,613 625
Non-Compete Agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Beginning balance 753 828
Amortization expense (56) (56)
Ending balance $ 697 $ 772