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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016 | Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Increase in market value of the underlying COLI investments |  |  | $ 4,227 | $ 3,172 |
Recognized investment income(expense) | $ 3,400 | $ (700) | 6,797 | 3,226 |
CSV of COLI Contracts |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Gross CSV | 182,500 |  | 182,500 |  | $ 180,300
Outstanding policy loans | 66,800 |  | 66,800 |  | $ 67,200
Increase in market value of the underlying COLI investments | 1,700 | 700 | 4,200 | 3,200 |
Executive Capital Accumulation Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Gain (loss) on deferred compensation plan | 3,500 | $ (600) | $ 7,200 | $ 2,600 |
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 |  | $ 200 |  |

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