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Retirement Plans
 3 Months Ended
Jul. 31, 2023
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
The components of net pension expense (income) for our defined benefit plans were as follows:
Three Months Ended
July 31,
20232022
Service cost$134 $200 
Interest cost6,947 6,189 
Expected return on plan assets(7,491)(8,384)
Amortization of prior service cost(23)(23)
Amortization of net actuarial loss2,026 1,524 
Net pension expense (income)$1,593 $(494)
The service cost component of net pension expense (income) is reflected in Operating and administrative expenses on our Unaudited Condensed Consolidated Statements of Net Loss. The other components of net pension expense (income) are reported separately from the service cost component and below Operating loss. Such amounts are reflected in Other (expense) income, net on our Unaudited Condensed Consolidated Statements of Net Loss.
Employer defined benefit pension plan contributions were $4.1 million and $3.9 million for the three months ended July 31, 2023 and 2022, respectively.
Defined Contribution Savings Plans
The expense for employer defined contribution savings plans was $7.7 million and $8.8 million for the three months ended July 31, 2023 and 2022, respectively.