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Retirement Plans (Tables)
 6 Months Ended
Oct. 31, 2017
Retirement Plans [Abstract]  
Components of Net Periodic Pension Expense (Income) for Defined Benefit Plans
The components of net pension expense (income) for the Company's global defined benefit plans were as follows (in thousands):
 
  
Three Months
Ended October 31,
  
Six Months
Ended October 31,
 
  
2017
  
2016
  
2017
  
2016
 
Service cost
 
$
242
  
$
251
  
$
472
  
$
503
 
Interest cost
  
6,346
   
6,506
   
12,598
   
13,704
 
Expected return on plan assets
  
(9,782
)
  
(8,656
)
  
(19,439
)
  
(18,031
)
Net amortization of prior service cost
  
(23
)
  
(24
)
  
(48
)
  
(49
)
Recognized net actuarial loss
  
1,534
   
1,270
   
3,035
   
2,632
 
Pension plan actuarial loss
  
-
   
8,842
   
-
   
8,842
 
Net pension expense (credit)
 
$
(1,683
)
 
$
8,189
  
$
(3,382
)
 
$
7,601