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Retirement Plans (Tables)
9 Months Ended
Jan. 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
January 31,
  
Nine Months Ended
January 31,
 
  
2019
  
2018
  
2019
  
2018
 
Service cost
 
$
226
  
$
243
  
$
688
  
$
715
 
Interest cost
  
6,103
   
6,407
   
18,484
   
19,005
 
Expected return on plan assets
  
(9,638
)
  
(9,924
)
  
(29,260
)
  
(29,363
)
Net amortization of prior service cost
  
(24
)
  
(24
)
  
(72
)
  
(72
)
Unrecognized net actuarial loss
  
1,429
   
1,536
   
4,337
   
4,550
 
Pension plan actuarial loss
 
$
  
$
  
$
  
$
21
 
Net pension income
  
(1,904
)
  
(1,762
)
  
(5,823
)
  
(5,144
)