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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, 2022 | Apr. 30, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 21,990 | $ 26,746
Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 21,353 | 26,140
Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 637 | 606
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 637 | 606
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 637 | 606
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 21,353 | 26,140
Fair Value, Inputs, Level 2 | Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 21,353 | $ 26,140

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