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Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 USD ($) employee executive shares | Apr. 30, 2016 USD ($) shares | Apr. 30, 2015 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 | $ 3,825 | $ 4,043 |
Expected future payments, 2018 | 507 |  |
Expected future payments, 2019 | 457 |  |
Expected future payments, 2020 | 432 |  |
Expected future payments, 2021 | 432 |  |
Expected future payments, 2022 | 432 |  |
Deferred compensation expense incurred | 370 | 238 | $ 219
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Employer discretionary contribution | $ 8,181 | $ 6,560 | 5,852
Common stock held by trustee of the 401K plan (shares) | shares | 1,401,764 | 1,419,841 |
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 | $ 4,737 | $ 5,230 |
Discount rate | 4.00% | 3.80% |
Pension and post-retirement expense incurred | $ 131 | $ 230 | $ 326
Expected future payments, 2018 | 625 |  |
Expected future payments, 2019 | 625 |  |
Expected future payments, 2020 | 625 |  |
Expected future payments, 2021 | 625 |  |
Expected future payments, 2022 | $ 625 |  |

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