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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2026 | Apr. 30, 2025
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets, valuation allowance | $ 400,447,000 | $ 320,939,000
Deferred tax assets, increase in valuation allowance | 79,500,000 |
Unrecognized tax benefits, if recognized, would impact effective income tax rate | 300,000 |
Unrecognized tax benefits, cumulative interest and penalties | 0 | 0
Unrecognized tax benefits, anticipated significant change over the next 12 months | 0 |
Federal |  |
Tax Credit Carryforward [Line Items] |  |
Net operating loss carryforwards | 1,044,500,000 | 764,700,000
Federal | Research Tax Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforwards | 29,900,000 |
Federal | Charitable Contribution Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforwards | 11,500,000 |
State |  |
Tax Credit Carryforward [Line Items] |  |
Net operating loss carryforwards | 400,400,000 | $ 310,700,000
State | Research Tax Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforwards | $ 23,300,000 |

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