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Retirement Plans (Tables)
 3 Months Ended
Jul. 31, 2021
Retirement Plans [Abstract]  
Components of Net Pension Income for Defined Benefit 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
)