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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, 2021 | Apr. 30, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 26,746 | $ 24,235
Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 26,140 | 24,041
Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 606 | 194
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 606 | 194
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 606 | 194
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 26,140 | 24,041
Fair Value, Inputs, Level 2 | Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 26,140 | $ 24,041

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