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Retirement Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan remaining pension plan liabilities | $ 17,800,000 |
Employer contributions | $ 287,000 | $ 0
Age limit of employees to be eligible for contribution (in years) | 21 years |
Minimum service period of employees to be eligible for contribution (in months) | 3 months |
Employee's compensation (as a percent) | 3.00% |
Employer matching contributions | $ 957,000 | $ 932,000
Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching contributions by company (as a percent) | 100.00% |
Contributions by employer per employee's compensation (as a percent) | 3.00% |
Employee's compensation (as a percent) | 4.00% |
Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching contributions by company (as a percent) | 50.00% |
Contributions by employer per employee's compensation (as a percent) | 5.00% |

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