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Deferred Compensation and Retirement Plans - Schedule of Fair Value Measurements of Defined Benefit Plan Assets (Detail) - Deferred compensation and pension plans - USD ($) $ in Thousands | Apr. 30, 2025 | Apr. 30, 2024
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 18,567 | $ 18,523
Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 17,832 | 18,033
Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 735 | 490
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 735 | 490
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 | 735 | 490
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 17,832 | 18,033
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 17,832 | 18,033
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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