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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
CONSOLIDATED STATEMENTS OF CASH FLOWS      
Unrealized (loss) gain on available-for-sale investments, net of deferred tax expense $ 0 $ 8 $ 1