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Retirement Plans (Tables)
3 Months Ended
Jul. 31, 2022
Retirement Plans [Abstract]  
Components of Net Pension Income for Defined Benefit Plans
The components of net pension income for our defined benefit plans were as follows:

 
Three Months Ended
July 31,
 
   
2022
   
2021
 
Service cost
 
$
200
   
$
307
 
Interest cost
   
6,189
     
5,223
 
Expected return on plan assets
   
(8,384
)
   
(10,259
)
Amortization of prior service cost
   
(23
)
   
(22
)
Amortization of net actuarial loss
   
1,524
     
1,897
 
Net pension income
 
$
(494
)
 
$
(2,854
)