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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, 2022 | Apr. 30, 2021
Retirement Benefits [Abstract] |  |
Accumulated Benefit Obligation, April 30 | $ 20,022,000 | $ 22,942,000
Change in Projected Benefit Obligations |  |
Projected benefit obligations, beginning of year | 22,942,000 | 23,720,000
Interest cost | 710,000 | 723,000
Actuarial loss | (2,218,000) | (97,000)
Actual benefits paid | (1,412,000) | (1,404,000)
Projected benefit obligations, end of year | 20,022,000 | 22,942,000
Change in Plan Assets |  |
Fair value of plan assets, beginning of year | 21,459,000 | 17,316,000
Actual return on plan assets | (1,180,000) | 5,517,000
Employer contributions | 0 | 30,000
Actual benefits paid | (1,412,000) | (1,404,000)
Fair value of plan assets, end of year | 18,867,000 | 21,459,000
Funded status—under | (1,155,000) | (1,483,000)
Amounts Recognized in the Consolidated Balance Sheets consist of: |  |
Non-current liabilities | (1,155,000) | (1,483,000)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Consist of: |  |
Net actual loss | 5,116,000 | 5,089,000
Deferred tax benefit | (1,202,000) | (1,196,000)
After-tax actuarial loss | $ 3,914,000 | $ 3,893,000
Weighted-average Assumptions Used to Determine Benefit Obligations at April 30 |  |
Discount rate | 4.40% | 3.20%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30 |  |
Discount rate | 4.40% | 3.20%
Expected long-term return on plan assets (as a percent) | 7.75% | 7.75%

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