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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015 | Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Increase in market value of the underlying COLI investments |  |  | $ 3,172 | $ 3,295 |
Recognized investment income(expense) | $ (700) | $ (2,500) | 3,226 | (1,818) |
CSV of COLI Contracts |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Gross CSV | 179,200 |  | 179,200 |  | $ 175,700
Outstanding policy loans | 68,400 |  | 68,400 |  | $ 68,400
Increase in market value of the underlying COLI investments | 700 | 800 | 3,200 | 3,300 |
Executive Capital Accumulation Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
(Loss) gain on deferred compensation plan | $ (600) | $ (1,600) | $ 2,600 | $ (900) |
Executive Capital Accumulation Plan | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation arrangement vesting period |  |  | 4 years |  |
Executive Capital Accumulation Plan | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation arrangement vesting period |  |  | 5 years |  |

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