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Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2015 USD ($) individual executive shares | Apr. 30, 2014 USD ($) shares | Apr. 30, 2013 USD ($)
401(K) Plan |  |  |
Defined Contribution Plan Disclosure |  |  |
Employer discretionary contribution | $ 5,852 | $ 5,348 | $ 4,949
Common stock held by trustee of the 401K plan | shares | 1,453,251 | 1,488,510 |
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 (in years) | 20 years |  |
Accrued deferred compensation liability | $ 5,626 | $ 5,925 |
Discount rate | 4.00% | 4.40% |
Pension and post-retirement expense incurred | $ 326 | $ 93 | 471
2016 | 625 |  |
2017 | 625 |  |
2018 | 625 |  |
2019 | 625 |  |
2020 | 625 |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block |  |  |
2016 | 167 |  |
2017 | 497 |  |
2018 | 497 |  |
2019 | 447 |  |
2020 | $ 422 |  |
Number of individuals with deferred compensation agreements | individual | 3 |  |
Number of current employees with deferred compensation agreements | individual | 1 |  |
Number of former employees with deferred compensation agreements | individual | 2 |  |
Accrued deferred compensation liability | $ 3,960 | 3,950 |
Deferred compensation expense incurred | $ 219 | $ 156 | $ 438

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