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Schedule of Significant Changes in Contract assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended
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Oct. 31, 2022 | Oct. 31, 2021
Account Receivable Contract Assets And Contract Liabilities |  |
Transferred to receivables from contract assets recognized at the beginning of the period | $ (132) |
Revenue recognized and not billed as of the end of the period | 47 |
Net change in contract assets | (85) |
Revenue recognized that was included in the contract liabilities balance as of the beginning of the period | (129) |
Payments collected for which revenue has not been recognized | 1,462 |
Net change in contract liabilities | $ 1,333 | $ 117

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