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Income Taxes - Schedule of Income Tax Reconciliation (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Income tax expense at U.S. federal statutory rate $ 2,884,000 $ 3,105,000
State and local taxes, net of federal income tax benefit 460,000 (168,000)
Tax credits (635,000) (515,000)
Increase (decrease) in valuation allowance 5,000 7,000
Nontaxable or nondeductible items    
Non-deductible transaction costs 0 348,000
Other 70,000 61,000
Return to provision adjustment (130,000) (72,000)
Other items, net (34,000) (169,000)
Net income tax (benefit) expense $ 3,268,000 $ 3,202,000
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Income tax expense at U.S. federal statutory rate 21.00% 21.00%
State and local taxes, net of federal income tax benefit 3.30% (1.10%)
Tax credits (4.60%) (3.50%)
Increase (decrease) in valuation allowance 0.00% 0.00%
Nontaxable or nondeductible items    
Non-deductible transaction costs 0.00% 2.40%
Other 0.50% 0.40%
Return to provision adjustment (0.90%) (0.50%)
Other items, net (0.20%) (1.10%)
Net income tax (benefit) expense 23.80% 21.70%
Foreign - India    
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Foreign tax effects $ 285,000 $ 190,000
Deferred taxes on unremitted foreign earnings ("APB 23") 437,000 416,000
Cross-border tax laws $ 21,000 $ 6,000
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Foreign tax effects 2.10% 1.30%
Deferred taxes on unremitted foreign earnings ("APB 23") 3.20% 2.80%
Cross-border tax laws 0.20% 0.00%
Foreign - Other jurisdictions    
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Foreign tax effects $ (95,000) $ (7,000)
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Foreign tax effects (0.70%) 0.00%