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Retirement Plans | 6 Months Ended
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Oct. 31, 2022
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plans The components of net pension income for our defined benefit plans were as follows:
| Three Months Ended October 31, |  | Six Months Ended October 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 192 |  |  | $ | 300 |  |  | $ | 392 |  |  | $ | 607 |
Interest cost | 5,994 |  |  | 5,178 |  |  | 12,183 |  |  | 10,401 |
Expected return on plan assets | (8,038) |  |  | (10,142) |  |  | (16,422) |  |  | (20,401) |
Amortization of prior service cost | (24) |  |  | (22) |  |  | (47) |  |  | (44) |
Amortization of net actuarial loss | 1,467 |  |  | 1,877 |  |  | 2,991 |  |  | 3,774 |
Net pension income | $ | (409) |  |  | $ | (2,809) |  |  | $ | (903) |  |  | $ | (5,663) |
The service cost component of net pension income is reflected in Operating and administrative expenses on our Unaudited Condensed Consolidated Statements of Net Income. The other components of net pension income are reported separately from the service cost component and below Operating income. Such amounts are reflected in Other (expense) income, net on our Unaudited Condensed Consolidated Statements of Net Income. Employer defined benefit pension plan contributions were $3.5 million and $7.4 million for the three and six months ended October 31, 2022, respectively, and $4.0 million and $8.5 million for the three and six months ended October 31, 2021, respectively. Defined Contribution Savings Plans The expense for employer defined contribution savings plans was $6.8 million and $15.6 million for the three and six months ended October 31, 2022, respectively, and $6.5 million and $15.6 million for the three and six months ended October 31, 2021, respectively.

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