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Stock-Based Compensation (Narrative) (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2024 USD ($) performance_period plan shares | Apr. 30, 2023 USD ($) | Apr. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense, before income taxes | $ 10,682 | $ 7,396 | $ 4,708
Number of stock incentive plans | plan | 3 |  |
Shares available for awards | shares | 749,850 |  |
Performance period | 1 year |  |
Period to achieve cultural goals | 3 years |  |
Total unrecognized compensation expense related to unvested stock options granted | $ 3,100 |  |
Expected to be recognized over a weighted average period | 2 years 3 months 18 days |  |
Accrued compensation and related expenses | $ 61,212 | $ 49,953 |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of performance periods | performance_period | 3 |  |
Total unrecognized compensation expense related to unvested stock options granted | $ 17,700 |  |
Expected to be recognized over a weighted average period | 1 year 8 months 12 days |  |
Restricted Stock Units (RSUs) [Member] | Employee Only |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |
Restricted Stock Units (RSUs) [Member] | Non Employee Directors only |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 2 years |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Contractual Term | 10 years |  |
Employee Service-Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 1 year |  |
Share-based Goods and Nonemployee Services Transaction, Shares Issuable Per Restricted Stock Unit Granted | shares | 1 |  |

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