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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Jan. 27, 2019
Apr. 29, 2018
Jan. 28, 2018
Apr. 30, 2017
Intangible Assets [Line Items]        
Tradenames $ 7,232 $ 683    
Intangible assets 10,542 4,275 [1] $ 1,397  
Customer Relationships [Member]        
Intangible Assets [Line Items]        
Finite-lived intangible assets, net 2,613 2,839 625 $ 664
Non-Compete Agreement [Member]        
Intangible Assets [Line Items]        
Finite-lived intangible assets, net $ 697 $ 753 $ 772 $ 828
[1] Derived from audited financial statements.