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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 08, 2024 USD ($) $ / shares shares | Apr. 30, 2025 USD ($) $ / shares shares | Apr. 30, 2024 USD ($) shares | Apr. 30, 2023 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercised (in shares) |  | 7,000 | 0 |
Target long-term incentive | $ | $ 3.0 |  |  |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting amount | $ |  | $ 0.5 |  |
Award vesting period |  | 3 years |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition |  | 2 years |  |
Options, exercises in period, intrinsic value | $ |  | $ 0.1 |  | $ 0.1
Total grant date fair value of stock options vested | $ |  | $ 0.6 | $ 0.9 | $ 0.5
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] |  |  |  |
Award vesting percentage | 100.00% |  |  |
Share-based compensation arrangement by share-based payment award, period for achievement of performance-based targets |  | 3 years |  |
Percentage of equity award value under share award plan | 0.60 |  |  |
Granted (in dollars per share) | $ / shares | $ 46.65 |  |  |
Granted (in shares) | 40,789 |  |  |
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] |  |  |  |
Award vesting period |  | 4 years |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition |  | 2 years 3 months 18 days |  |
Unrecognized share-based compensation expense | $ |  | $ 27.2 |  |
Granted (in dollars per share) | $ / shares |  | $ 43.06 |  |
Granted (in shares) |  | 735,000 | 1,089,000 | 540,000
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% |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of equity award value under share award plan | 0.40 |  |  |
Granted (in dollars per share) | $ / shares | $ 46.65 |  |  |
Granted (in shares) | 27,192 |  |  |
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage | 25.00% |  |  |
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage | 25.00% |  |  |
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage | 25.00% |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Four |  |  |  |
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 |  |  |  |
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) |  | 5,300,000 |  |
Director Stock Plan | Class A | 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 |  | 23,940 | 25,744 | 30,706

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