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Retirement Plans | 9 Months Ended
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Jan. 31, 2023
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plans The components of net pension income for our defined benefit plans were as follows:
| Three Months Ended January 31, |  | Nine Months Ended January 31,
| 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | 218 |  |  | $ | 291 |  |  | $ | 610 |  |  | $ | 898 |
Interest cost | 6,264 |  |  | 5,122 |  |  | 18,447 |  |  | 15,523 |
Expected return on plan assets | (8,281) |  |  | (9,986) |  |  | (24,703) |  |  | (30,387) |
Amortization of prior service cost | (23) |  |  | (23) |  |  | (70) |  |  | (67) |
Amortization of net actuarial loss | 1,602 |  |  | 1,858 |  |  | 4,593 |  |  | 5,632 |
Net pension income | $ | (220) |  |  | $ | (2,738) |  |  | $ | (1,123) |  |  | $ | (8,401) |
The service cost component of net pension income is reflected in Operating and administrative expenses on our Unaudited Condensed Consolidated Statements of Net (Loss) Income. The other components of net pension income are reported separately from the service cost component and below Operating (loss) income. Such amounts are reflected in Other income, net on our Unaudited Condensed Consolidated Statements of Net (Loss) Income. Employer defined benefit pension plan contributions were $3.6 million and $11.0 million for the three and nine months ended January 31, 2023, respectively, and $3.4 million and $11.9 million for the three and nine months ended January 31, 2022, respectively. Defined Contribution Savings Plans The expense for employer defined contribution savings plans was $7.9 million and $23.5 million for the three and nine months ended January 31, 2023, respectively, and $7.2 million and $22.8 million for the three and nine months ended January 31, 2022, respectively.

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