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Provision for (Benefit from) Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2013
Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, valuation allowance | $ 14,838 | $ 18,106 |  |
Deferred tax assets, valuation allowance, increase (decrease) | (3,300) | 1,400 |  |
Operating loss carryforwards | 35,100 | 38,600 |  |
Operating loss, limitations on use | 432 |  |  | $ 12,000
Unrecognized tax benefits | $ 0 | $ 181 | $ 181 |

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