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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, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Retirement Benefits [Abstract] |  |  |
Accumulated Benefit Obligation, April 30 | $ 21,544 | $ 21,313 |
Change in Projected Benefit Obligations |  |  |
Projected benefit obligations, beginning of year | 21,313 | 21,156 |
Interest cost | 875 | 927 | $ 912
Actuarial loss | 480 | 299 |
Actual benefits paid | (1,124) | (1,069) |
Projected benefit obligations, end of year | 21,544 | 21,313 | 21,156
Change in Plan Assets |  |  |
Fair value of plan assets, beginning of year | 17,198 | 15,817 |
Actual return on plan assets | 1,866 | 1,895 |
Employer contributions | 600 | 555 |
Actual benefits paid | (1,124) | (1,069) |
Fair value of plan assets, end of year | 18,540 | 17,198 | $ 15,817
Funded status-under | (3,004) | (4,115) |
Amounts Recognized in the Consolidated Balance Sheets consist of: |  |  |
Noncurrent liabilities | (3,004) | (4,115) |
Amounts recognized in accumulated other comprehensive income (loss) consist of: |  |  |
Net actual loss | 7,481 | 8,686 |
Deferred tax benefit | (1,825) | (3,223) |
After-tax actuarial loss | $ 5,656 | $ 5,463 |
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30 |  |  |
Discount rate | 4.10% | 4.10% |
Rate of compensation increase | 0.00% | 0.00% |
Mortality table | Apr 30, 2018 RP-2014 and Apr 30,2017 RP-2014 |  |
Projection scale | Apr 30, 2018 MP-2017 and Apr 30,2017 MP-2016 |  |
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30 |  |  |
Discount rate | 4.10% | 4.50% |
Expected long-term return on plan assets | 7.75% | 8.00% |
Rate of compensation increase | 0.00% | 0.00% |

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