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Retirement Plans (Tables)
 6 Months Ended
Oct. 31, 2019
Retirement Plans [Abstract]  
Components of Net Periodic Pension Expense (Income) for Defined Benefit Plans The components of net pension expense (income) for our global defined benefit plans were as follows:


 
Three Months Ended
October 31,
    
Six Months Ended
October 31,
  
   
2019
    
2018
    
2019
    
2018
  
Service cost
  
$
1,093
    
$
229
    
$
1,317
    
$
462
  
Interest cost
    
6,350
      
6,169
      
12,184
      
12,381
  
Expected return on plan assets
    
(9,886
)
    
(9,720
)
    
(19,945
)
    
(19,622
)
Net amortization of prior service cost
    
(19
)
    
(24
)
    
(38
)
    
(48
)
Unrecognized net actuarial loss
    
1,581
      
1,474
      
3,181
      
2,908
  
Net pension income
  
$
(881
)
  
$
(1,872
)
  
$
(3,301
)
  
$
(3,919
)