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Other Noncurrent Assets - Summary of Change in Carrying Amount of Finite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 29, 2018
Jul. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Customer Relationships, Beginning balance $ 2,839 $ 664
Customer Relationships, Ending balance 2,764 651
Non-compete agreement, Beginning balance 753 828
Non-compete agreement, Ending balance 734 809
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Acquisition of assets 0 0
Amortization expense (75) (13)
Loss on impairment 0 0
Non-compete Agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (19) (19)
Loss on impairment $ 0 $ 0