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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, 2021 | Apr. 30, 2020
Retirement Benefits [Abstract] |  |
Accumulated Benefit Obligation, April 30 | $ 22,942,000 | $ 23,720,000
Change in Projected Benefit Obligations |  |
Projected benefit obligations, beginning of year | 23,720,000 | 21,394,000
Interest cost | 723,000 | 832,000
Actuarial (loss) gain | (97,000) | 2,769,000
Actual benefits paid | (1,404,000) | (1,275,000)
Projected benefit obligations, end of year | 22,942,000 | 23,720,000
Change in Plan Assets |  |
Fair value of plan assets, beginning of year | 17,316,000 | 19,035,000
Actual return on plan assets | 5,517,000 | (444,000)
Employer contributions | 30,000 | 0
Actual benefits paid | (1,404,000) | (1,275,000)
Fair value of plan assets, end of year | 21,459,000 | 17,316,000
Funded status—under | (1,483,000) | (6,404,000)
Amounts Recognized in the Consolidated Balance Sheets consist of: |  |
Non-current liabilities | (1,483,000) | (6,404,000)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Consist of: |  |
Net actual loss | 5,089,000 | 11,133,000
Deferred tax benefit | (1,196,000) | (2,616,000)
After-tax actuarial loss | $ 3,893,000 | $ 8,517,000
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30 |  |
Discount rate | 3.20% | 3.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30 |  |
Discount rate | 3.20% | 3.10%
Expected long-term return on plan assets (as a percent) | 7.75% | 7.75%

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