v3.26.1
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