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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase in market value of the underlying COLI investments | $ 2,485 | $ 2,498 |
Recognized investment income(expense) | 3,429 | 3,915 |
CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross CSV | 180,700 |  | $ 180,300
Outstanding policy loans | 66,800 |  | $ 67,200
Increase in market value of the underlying COLI investments | 2,500 | 2,500 |
Executive Capital Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gain (loss) on deferred compensation plan | $ 3,700 | $ 3,200 |
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 |  |
Defined Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected future employer contributions, current fiscal year | $ 200 |  |

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