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Intangible Asset - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Aug. 04, 2019
Apr. 28, 2019
Jul. 29, 2018
Apr. 29, 2018
Intangible Assets [Line Items]        
Tradenames $ 7,232 $ 7,232 $ 7,232 $ 683
Intangible assets 10,354 10,448 [1] 10,730  
Customer Relationships [Member]        
Intangible Assets [Line Items]        
Finite-lived intangible assets, net 2,463 2,538 2,764 2,839
Non-Compete Agreement [Member]        
Intangible Assets [Line Items]        
Finite-lived intangible assets, net $ 659 $ 678 $ 734 $ 753
[1] Derived from audited financial statements.