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Other Assets (Detail) - USD ($)
$ in Thousands
Apr. 29, 2018
Apr. 30, 2017
May 01, 2016
May 03, 2015
Other Assets, Noncurrent [Abstract]        
customer relationships, net $ 2,839 $ 664 $ 715 $ 766
tradename 683      
non-compete agreement, net 753 828 $ 903 $ 978
cash surrender value - life 393 376    
other 564 526    
other assets $ 5,232 $ 2,394