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Retirement Plans
 9 Months Ended
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,
2023202220232022
Service cost$218 $291 $610 $898 
Interest cost6,264 5,122 18,447 15,523 
Expected return on plan assets(8,281)(9,986)(24,703)(30,387)
Amortization of prior service cost(23)(23)(70)(67)
Amortization of net actuarial loss1,602 1,858 4,593 5,632 
Net pension income$(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.