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Summary of Significant Accounting Policies - Schedule of Activity in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of year $ 357 $ 636
Bad debt provision 120 92
Doubtful accounts written off (net) (1) (371)
Balance at end of year $ 476 $ 357