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Retirement Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
Defined pension benefit plan, net periodic benefit cost | $ 560,000 |
Anticipated contribution in the next fiscal year related to pension plans | 0 |
Employer contributions | $ 30,000 | $ 0
Increase decrease in the discount rate | 1.00% | 1.00%
Decrease increase pension expense | $ 165,000 | $ 183,000
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 | $ 997,000 | $ 974,000
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% |
Equity Securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Plan asset percentage | 75.00% | 75.00%
Fixed Income | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Plan asset percentage | 25.00% | 25.00%
Yield Curve Technique |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase decrease in the discount rate | 1.00% | 1.00%
Decrease increase pension expense | $ 286,000 | $ 236,000
Yield Curve Technique | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Par amount outstanding | $ 250,000,000 |

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