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Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
3 Months Ended
Aug. 04, 2019
Jul. 29, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 393 $ 357
Provision for bad debts (30) 9
Net write-offs, net of recoveries
Ending balance $ 363 $ 366