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Deferred Compensation and Retirement Plans (Tables) | 3 Months Ended
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Jul. 31, 2016
Deferred Compensation Plan |
Components Of Net Periodic Benefit Costs | The components of net periodic benefit costs are as follows:
|  | Three Months Ended July 31, |
|  | 2016 |  |  | 2015 |
|  | (in thousands) |
Interest cost |  | $ | 1,062 |  |  | $ | 703 |
Amortization of actuarial loss |  |  | 763 |  |  |  | 731 |
Service cost |  |  | 609 |  |  |  | — |
Expected return on plan assets |  |  | (390 | ) |  |  | — |
Net periodic benefit costs |  | $ | 2,044 |  |  | $ | 1,434 |

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