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Revenue Recognition - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021
Revenue Recognition [Line Items] |  |
Contract assets in accounts receivable | $ 9,287,000 | $ 5,716,000
Contract liabilities | 3,529,000 | 3,123,000
Prepaid Expenses and Other Current Assets |  |
Revenue Recognition [Line Items] |  |
Contract assets in other assets | $ 1,293,000 | $ 1,213,000
Fiscal Year 2022 |  |
Revenue Recognition [Line Items] |  |
Contract liability recognized as revenue percentage | 100.00% |

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