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Retirement Plans (Tables)
3 Months Ended
Jul. 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):
 
 
For the Three Months
Ended July 31,
 
2017
 
2016
Service cost
$230
 
$252
Interest cost
6,252
 
7,198
Expected return on plan assets
(9,657)
 
(9,375)
Net amortization of prior service cost
(25)
 
(25)
Recognized net actuarial loss
1,501
 
1,362
Net pension income
$(1,699)
 
$(588)