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Intangible Assets - Summary of Change in Carrying Amount of Finite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended
Oct. 28, 2018
Oct. 29, 2017
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Beginning balance $ 2,839 $ 664
Acquisition of assets 0 0
Amortization expense (151) (26)
Loss on impairment 0 0
Ending balance 2,688 638
Non-Compete Agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Beginning balance 753 828
Amortization expense (37) (38)
Loss on impairment 0 0
Ending balance $ 716 $ 790