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Retirement Plans (Tables)
9 Months Ended
Jan. 31, 2021
Retirement Plans [Abstract]  
Components of Net Pension Income for Defined Benefit Plans
The components of net pension income for the Company’s defined benefit plans were as follows:

 
Three Months Ended
January 31,
   
Nine Months Ended
January 31,
 
   
2021
   
2020
   
2021
   
2020
 
Service cost
 
$
356
   
$
283
   
$
1,036
   
$
1,600
 
Interest cost
   
4,564
     
5,919
     
13,695
     
18,103
 
Expected return on plan assets
   
(9,853
)
   
(10,217
)
   
(28,880
)
   
(30,162
)
Amortization of prior service cost
   
(23
)
   
(18
)
   
(72
)
   
(56
)
Amortization of net actuarial loss
   
1,944
     
1,623
     
5,964
     
4,804
 
Net pension income
 
$
(3,012
)
 
$
(2,410
)
 
$
(8,257
)
 
$
(5,711
)