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Defined Benefit Pension Plans | 3 Months Ended
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Jul. 31, 2021
Retirement Benefits [Abstract] |
Defined Benefit Pension Plans | Defined Benefit Pension Plans The Company has non-contributory defined benefit pension plans covering substantially all domestic salaried and hourly employees. These plans were amended as of April 30, 2005; no further benefits have been, or will be, earned under the plans, subsequent to the amendment date, and no additional participants will be added to the plans. There were no Company contributions paid to the plans for the three months ended July 31, 2021 and July 31, 2020. The Company assumed an expected long-term rate of return of 7.75% for the periods ended July 31, 2021 and July 31, 2020. Pension (income) / expense consisted of the following (in thousands):
| Three Months Ended
| July 31, 2021 |  | July 31, 2020
Service cost | $ | 0 |  |  | $ | 0 |
Interest cost | 177 |  |  | 181 |
Expected return on plan assets | (401) |  |  | (321) |
Recognition of net loss | 135 |  |  | 428 |
Net periodic pension (income) expense | $ | (89) |  |  | $ | 288 |

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