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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercised (in shares) | 3,000 |  | 0
Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 2 years |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition | 1 year |  |
Award vesting amount | $ 0.3 |  |
Options, exercises in period, intrinsic value (less than for 2026) | 0.1 | $ 0.1 |
Total grant date fair value of stock options vested | $ 0.2 | $ 0.6 | $ 0.9
Options | Share-based Payment Arrangement, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 10.00% |  |
Options | Share-based Payment Arrangement, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 20.00% |  |
Options | Share-based Payment Arrangement, Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 30.00% |  |
Options | Share-based Compensation Award, Tranche Four |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 40.00% |  |
Performance-based Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, period for achievement of performance-based targets | 3 years |  |
Performance-based Restricted Stock Awards | Vesting on June 30 Following End of Performance Cycle | Key Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 100.00% |  |
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized share-based compensation expense | $ 28.5 |  |
Award vesting period | 4 years |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition | 2 years 2 months 12 days |  |
Restricted Stock Awards | Annual Vesting on Anniversary of Grant | Key Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 25.00% |  |
Minimum | Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price of stock options granted as percentage of fair market value of stock at date of grant as required by the plan | 100.00% |  |
Maximum | Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 10 years |  |
2014 Key Employee Stock Plan | Class A common stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 6,200,000 |  |
Number of shares available for grant (in shares) | 4,700,000 |  |
Director Stock Plan | Class A common stock | Non-Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Value of annual award as percentage of annual director retainer fee based on stock price on date of grant | 100.00% |  |
Deferred compensation arrangement with individual, shares issued | 26,980 | 23,940 | 25,744

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