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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2017 | Jan. 31, 2016 | Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Increase (decrease) in market value of the underlying COLI investments |  |  | $ 3,316 | $ 1,801 |
Recognized investment income(expense) | $ 3,900 | $ (7,100) | 7,090 | (8,904) |
CSV of COLI Contracts |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Gross CSV | 180,300 |  | 180,300 |  | $ 175,700
Outstanding policy loans | 68,400 |  | 68,400 |  | $ 68,400
Increase (decrease) in market value of the underlying COLI investments | 100 | (1,500) | 3,300 | 1,800 |
Executive Capital Accumulation Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
(Loss) gain on deferred compensation plan | $ 4,100 | $ (5,300) | $ 6,700 | $ (6,200) |
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 |  |

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