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Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 USD ($) executive shares | Apr. 30, 2019 USD ($) shares | Apr. 30, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Accrued deferred compensation liability | $ 3,793 | $ 2,870 |
Expected future payments, 2021 | 1,511 |  |
Expected future payments, 2022 | 401 |  |
Expected future payments, 2023 | 401 |  |
Expected future payments, 2024 | 401 |  |
Expected future payments, 2025 | 401 |  |
Deferred compensation expense incurred | 2,727 | (97) | $ 131
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Employer discretionary contribution | $ 10,571 | $ 9,918 | 9,614
Common stock held by trustee of the 401K plan (shares) | shares | 1,113,882 | 1,261,258 |
Supplemental Employee Retirement Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Number of executives covered under SERP | executive | 2 |  |
Annual benefit amount (percent of base compensation) | 50.00% |  |
Duration of benefits | 20 years |  |
Accrued deferred compensation liability | $ 3,434 | $ 3,800 |
Pension and post-retirement expense incurred | 269 | $ 221 | $ 112
Expected future payments, 2021 | 635 |  |
Expected future payments, 2022 | 635 |  |
Expected future payments, 2023 | 635 |  |
Expected future payments, 2024 | 354 |  |
Expected future payments, 2025 | $ 354 |  |
Minimum | Supplemental Employee Retirement Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Discount rate | 2.04% | 3.78% |
Maximum | Supplemental Employee Retirement Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Discount rate | 2.44% | 4.01% |

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