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Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
6 Months Ended
Nov. 03, 2019
Oct. 28, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 393 $ 357
Provision for bad debts (27) 28
Net write-offs, net of recoveries   3
Ending balance $ 366 $ 388