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Other Assets - Summary of Change in Carrying Amount of Finite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 29, 2018
Apr. 30, 2017
May 01, 2016
Finite-Lived Intangible Assets [Line Items]      
customer relationships, beginning balance $ 664 $ 715 $ 766
customer relationships, ending balance 2,839 664 715
non-compete agreement, beginning balance 828 903 978
non-compete agreement, ending balance 753 828 903
Non-compete Agreement [Member]      
Finite-Lived Intangible Assets [Line Items]      
amortization expense (75) (75) (75)
loss on impairment 0 0 0
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
acquisition of assets 2,247    
amortization expense (72) (51) (51)
loss on impairment $ 0 $ 0 $ 0