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Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 USD ($) employee executive shares | Apr. 30, 2017 USD ($) shares | Apr. 30, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Number of individuals with deferred compensation agreements | employee | 3 |  |
Accrued deferred compensation liability | $ 3,431 | $ 3,825 |
Expected future payments, 2019 | 464 |  |
Expected future payments, 2020 | 439 |  |
Expected future payments, 2021 | 439 |  |
Expected future payments, 2022 | 439 |  |
Expected future payments, 2023 | 439 |  |
Deferred compensation expense incurred | 131 | 370 | $ 238
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Employer discretionary contribution | $ 9,614 | $ 8,181 | 6,560
Common stock held by trustee of the 401K plan (shares) | shares | 1,389,694 | 1,401,764 |
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 | $ 4,214 | $ 4,737 |
Discount rate | 4.50% | 4.00% |
Pension and post-retirement expense incurred | $ 112 | $ 131 | $ 230
Expected future payments, 2019 | 635 |  |
Expected future payments, 2020 | 625 |  |
Expected future payments, 2021 | 625 |  |
Expected future payments, 2022 | 625 |  |
Expected future payments, 2023 | $ 625 |  |

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