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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Retirement Benefits [Abstract] |  |
Accumulated Benefit Obligation, April 30 | $ 21,394 | $ 21,544
Change in Projected Benefit Obligations |  |
Projected benefit obligations, beginning of year | 21,544 | 21,313
Interest cost | 859 | 875
Actuarial loss | 412 | 480
Actual benefits paid | (1,421) | (1,124)
Projected benefit obligations, end of year | 21,394 | 21,544
Change in Plan Assets |  |
Fair value of plan assets, beginning of year | 18,540 | 17,198
Actual return on plan assets | 916 | 1,866
Employer contributions | 1,000 | 600
Actual benefits paid | (1,421) | (1,124)
Fair value of plan assets, end of year | 19,035 | 18,540
Funded status—under | (2,359) | (3,004)
Amounts Recognized in the Consolidated Balance Sheets consist of: |  |
Noncurrent liabilities | (2,359) | (3,004)
Amounts recognized in accumulated other comprehensive income (loss) consist of: |  |
Net actual loss | 7,541 | 7,481
Deferred tax benefit | (1,772) | (1,825)
After-tax actuarial loss | $ 5,769 | $ 5,656
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30 |  |
Discount rate | 3.90% | 4.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30 |  |
Discount rate | 3.90% | 4.10%
Expected long-term return on plan assets | 7.75% | 7.75%

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