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Allowance for Doubtful Accounts - Summary of the Activity in the Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
6 Months Ended
Oct. 31, 2021
Nov. 01, 2020
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 591,000 $ 472,000
Provision for bad debts (23,000) 123,000
Write-offs, net of recoveries (34,000)  
Ending balance $ 534,000 $ 595,000