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Retirement Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Defined pension benefit plan, net periodic benefit cost | $ 970,000 |
Employer contributions | 1,000,000 | $ 600,000
Anticipated contribution in the next fiscal year related to pension plans | $ 0 |
Increase decrease in the discount rate | 1.00% | 1.00%
Decrease increase pension expense | $ 187,000 | $ 170,000
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 | $ 1,291,000 | $ 1,159,000
Maximum |  |
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 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching contributions by company | 50.00% |
Contributions by employer per employee's compensation | 5.00% |
Equity Securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Plan asset percentage | 75.00% | 75.00%
Fixed Income | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Plan asset percentage | 25.00% | 25.00%
Yield Curve Technique |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase decrease in the discount rate | 1.00% | 1.00%
Decrease increase pension expense | $ 234,000 | $ 243,000
Yield Curve Technique | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Par amount outstanding | $ 250,000,000 |

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