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Retirement Plans (Tables)
 6 Months Ended
Oct. 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
October 31,
    
Six Months Ended
October 31,
  
   
2021
    
2020
    
2021
    
2020
  
Service cost
  
$
300
    
$
347
    
$
607
    
$
680
  
Interest cost
    
5,178
      
4,610
      
10,401
      
9,131
  
Expected return on plan assets
    
(10,142
)
    
(9,649
)
    
(20,401
)
    
(19,027
)
Amortization of prior service cost
    
(22
)
    
(24
)
    
(44
)
    
(49
)
Amortization of net actuarial loss
    
1,877
      
2,033
      
3,774
      
4,020
  
Net pension income
  
$
(2,809
)
  
$
(2,683
)
  
$
(5,663
)
  
$
(5,245
)