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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, 2024 | Apr. 30, 2023
Retirement Benefits [Abstract] |  |
Accumulated Benefit Obligation, April 30 | $ 0 | $ 18,368,000
Change in Projected Benefit Obligations |  |
Projected benefit obligations, beginning of year | 18,368,000 | 20,022,000
Interest cost | 890,000 | 845,000
Actuarial gain (loss) | 53,000 | (1,113,000)
Actual benefits paid | (1,558,000) | (1,386,000)
Transfer to insurer | (17,753,000) | 0
Projected benefit obligations, end of year | 0 | 18,368,000
Change in Plan Assets |  |
Fair value of plan assets, beginning of year | 17,732,000 | 18,867,000
Actual return on plan assets | 1,292,000 | 251,000
Employer contributions | 287,000 | 0
Transfer to insurer | (17,753,000) | 0
Actual benefits paid | (1,558,000) | (1,386,000)
Fair value of plan assets, end of year | 0 | 17,732,000
Funded status—under | 0 | (636,000)
Amounts Recognized in the Consolidated Balance Sheets consist of: |  |
Non-current liabilities | 0 | (636,000)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Consist of: |  |
Net actual loss | 0 | 4,526,000
Deferred tax benefit | 0 | (1,064,000)
After-tax actuarial loss | $ 0 | $ 3,462,000
Weighted-average Assumptions Used to Determine Benefit Obligations at April 30 |  |
Discount rate |  | 5.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30 |  |
Discount rate |  | 5.10%
Expected long-term return on plan assets (as a percent) |  | 7.75%

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