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Deferred Compensation and Retirement Plans (Tables) | 6 Months Ended
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Oct. 31, 2016
Deferred Compensation Plan |
Components Of Net Periodic Benefit Costs | The components of net periodic benefit costs are as follows:
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Service cost |  | $ | 1,579 |  |  | $ | — |  |  | $ | 2,188 |  |  | $ | — |
Interest cost |  |  | 1,061 |  |  |  | 703 |  |  |  | 2,123 |  |  |  | 1,406 |
Amortization of actuarial loss |  |  | 763 |  |  |  | 731 |  |  |  | 1,526 |  |  |  | 1,462 |
Expected return on plan assets |  |  | (390 | ) |  |  | — |  |  |  | (780 | ) |  |  | — |
Net periodic benefit costs |  | $ | 3,013 |  |  | $ | 1,434 |  |  | $ | 5,057 |  |  | $ | 2,868 |

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