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Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 USD ($) employee executive shares | Apr. 30, 2015 USD ($) shares | Apr. 30, 2014 USD ($)
401(K) Plan |  |  |
Defined Contribution Plan Disclosure |  |  |
Employer discretionary contribution | $ 6,560 | $ 5,852 | $ 5,348
Common stock held by trustee of the 401K plan (shares) | shares | 1,419,841 | 1,453,251 |
Supplemental Executive 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 | $ 5,230 | $ 5,626 |
Discount rate | 3.80% | 4.00% |
Pension and post-retirement expense incurred | $ 230 | $ 326 | 93
Expected future payments, 2017 | 625 |  |
Expected future payments, 2018 | 625 |  |
Expected future payments, 2019 | 625 |  |
Expected future payments, 2020 | 625 |  |
Expected future payments, 2021 | 625 |  |
Other Post-Employment Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
Expected future payments, 2017 | 507 |  |
Expected future payments, 2018 | 507 |  |
Expected future payments, 2019 | 457 |  |
Expected future payments, 2020 | 432 |  |
Expected future payments, 2021 | $ 432 |  |
Number of individuals with deferred compensation agreements | employee | 3 |  |
Accrued deferred compensation liability | $ 4,043 | 3,960 |
Deferred compensation expense incurred | $ 238 | $ 219 | $ 156

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