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Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 USD ($) employee executive shares | Apr. 30, 2018 USD ($) shares | Apr. 30, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Number of individuals with deferred compensation agreements | employee | 2 |  |
Accrued deferred compensation liability | $ 2,870 | $ 3,431 |
Expected future payments, 2020 | 401 |  |
Expected future payments, 2021 | 401 |  |
Expected future payments, 2022 | 401 |  |
Expected future payments, 2023 | 401 |  |
Expected future payments, 2024 | 401 |  |
Deferred compensation expense incurred | (97) | 131 | $ 370
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Employer discretionary contribution | $ 9,918 | $ 9,614 | 8,181
Common stock held by trustee of the 401K plan (shares) | shares | 1,261,258 | 1,389,694 |
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 | $ 3,800 | $ 4,214 |
Discount rate |  | 4.50% |
Pension and post-retirement expense incurred | 221 | $ 112 | $ 131
Expected future payments, 2020 | 635 |  |
Expected future payments, 2021 | 635 |  |
Expected future payments, 2022 | 635 |  |
Expected future payments, 2023 | 635 |  |
Expected future payments, 2024 | $ 354 |  |
Minimum | Supplemental Employee Retirement Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Discount rate | 3.78% |  |
Maximum | Supplemental Employee Retirement Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Discount rate | 4.01% |  |

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