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Retirement Plans
 3 Months Ended
Jul. 31, 2021
Retirement Plans [Abstract]  
Retirement Plans
Note 14 — Retirement Plans

The components of net pension income for the defined benefit plans were as follows:

  
Three Months Ended
July 31,
  
   
2021
    
2020
  
Service cost
  
$
307
    
$
333
  
Interest cost
    
5,223
      
4,521
  
Expected return on plan assets
    
(10,259
)
    
(9,378
)
Amortization of prior service cost
    
(22
)
    
(25
)
Amortization of net actuarial loss
    
1,897
      
1,987
  
Net pension income
  
$
(2,854
)
  
$
(2,562
)

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 income, net on our Unaudited Condensed Consolidated Statements of Net Income.

Employer defined benefit pension plan contributions were $4.5 million and $5.1 million for the three months ended July 31, 2021 and 2020, respectively.

Defined Contribution Savings Plans

The expense for employer defined contribution savings plans was $9.1 million and $6.6 million for the three months ended July 31, 2021 and 2020, respectively.