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Employee Pension Plans (Tables)
 3 Months Ended
Jul. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Defined Benefit Pension Plan Expense (Income)
The net defined benefit pension plan expense (income) is as follows:
 
Three months ended
 
July 31, 2015
 
July 31, 2016
Current service cost
$
4,043

 
$
3,518

Interest cost
5,838

 
5,020

Expected return on plan assets
(10,756
)
 
(8,707
)
Amortization of net actuarial and experience losses
1,247

 
1,549

Amortization of past service credits
(124
)
 
(111
)
Employee contributions
(421
)
 
(379
)
 
$
(173
)
 
$
890