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Deferred Compensation and Retirement Plans - Fair Value Measurements of Defined Benefit Plan Assets (Detail) - Deferred compensation and pension plans - USD ($) $ in Thousands | Apr. 30, 2024 | Apr. 30, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 18,523 | $ 19,085
Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 18,033 | 18,350
Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 490 | 735
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 490 | 735
Level 1 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 0 | 0
Level 1 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 490 | 735
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 18,033 | 18,350
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 18,033 | 18,350
Level 2 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 0 | 0
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 0 | 0
Level 3 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 0 | 0
Level 3 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 0 | $ 0

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