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Deferred Compensation and Retirement Plans (Tables) | 9 Months Ended
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Jan. 31, 2017
Deferred Compensation Plan |
Components Of Net Periodic Benefit Costs | The components of net periodic benefit costs are as follows:
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Service cost |  | $ | 1,793 |  |  | $ | — |  |  | $ | 3,981 |  |  | $ | — |
Interest cost |  |  | 1,062 |  |  |  | 703 |  |  |  | 3,185 |  |  |  | 2,109 |
Amortization of actuarial loss |  |  | 763 |  |  |  | 730 |  |  |  | 2,289 |  |  |  | 2,192 |
Expected return on plan assets |  |  | (389 | ) |  |  | — |  |  |  | (1,169 | ) |  |  | — |
Net periodic benefit costs |  | $ | 3,229 |  |  | $ | 1,433 |  |  | $ | 8,286 |  |  | $ | 4,301 |

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