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Retirement Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average annual compensation period | Ten years |  |
Defined pension benefit plan, net periodic benefit cost | $ 910,000 |  |
Employer contributions | 600,000 | $ 555,000 |
Anticipated contribution in the next fiscal year related to pension plans | $ 1,000,000 |  |
Increase decrease in the discount rate | 1.00% | 1.00% |
Decrease increase pension expense | $ 170,000 | $ 152,000 |
Age limit of employees to be eligible for contribution | 21 years |  |
Minimum service period of employees to be eligible for contribution | 3 months |  |
Employee's compensation | 3.00% |  |
Non-matching contribution for participants employed | 1.00% |  |
Contribution made by company | $ 1,159,000 | $ 1,118,000 | $ 1,057,000
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching contributions by company | 100.00% |  |
Contributions by employer per employee's compensation | 3.00% |  |
Employee's compensation | 4.00% |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching contributions by company | 50.00% |  |
Contributions by employer per employee's compensation | 5.00% |  |
Equity Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset percentage | 75.00% | 75.00% |
Fixed Income Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset percentage | 25.00% | 25.00% |
Yield Curve Technique [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase decrease in the discount rate | 1.00% | 1.00% |
Decrease increase pension expense | $ 243,000 | $ 240,000 |
Yield Curve Technique [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Par amount outstanding | $ 250,000,000 |  |

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