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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail) - USD ($) | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022
Retirement Benefits [Abstract] |  |
Accumulated Benefit Obligation, April 30 | $ 18,368,000 | $ 20,022,000
Change in Projected Benefit Obligations |  |
Projected benefit obligations, beginning of year | 20,022,000 | 22,942,000
Interest cost | 845,000 | 710,000
Actuarial loss | (1,113,000) | (2,218,000)
Actual benefits paid | (1,386,000) | (1,412,000)
Projected benefit obligations, end of year | 18,368,000 | 20,022,000
Change in Plan Assets |  |
Fair value of plan assets, beginning of year | 18,867,000 | 21,459,000
Actual return on plan assets | 251,000 | (1,180,000)
Employer contributions | 0 | 0
Actual benefits paid | (1,386,000) | (1,412,000)
Fair value of plan assets, end of year | 17,732,000 | 18,867,000
Funded status—under | (636,000) | (1,155,000)
Amounts Recognized in the Consolidated Balance Sheets consist of: |  |
Non-current liabilities | (636,000) | (1,155,000)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Consist of: |  |
Net actual loss | 4,526,000 | 5,116,000
Deferred tax benefit | (1,064,000) | (1,202,000)
After-tax actuarial loss | $ 3,462,000 | $ 3,914,000
Weighted-average Assumptions Used to Determine Benefit Obligations at April 30 |  |
Discount rate | 5.10% | 4.40%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30 |  |
Discount rate | 5.10% | 4.40%
Expected long-term return on plan assets (as a percent) | 7.75% | 7.75%

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