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Retirement Plans
 9 Months Ended
Jan. 31, 2018
Retirement Plans [Abstract]  
Retirement Plans
12.
Retirement Plans

The components of net pension (income) expense for the Company’s global defined benefit plans were as follows:
 
  
Three Months
Ended January 31,
  
Nine Months
Ended January 31,
 
  
2018
  
2017
  
2018
  
2017
 
Service cost
 
$
243
  
$
241
  
$
715
  
$
744
 
Interest cost
  
6,407
   
6,565
   
19,005
   
20,269
 
Expected return on plan assets
  
(9,924
)
  
(8,588
)
  
(29,363
)
  
(26,619
)
Net amortization of prior service cost
  
(24
)
  
(26
)
  
(72
)
  
(75
)
Recognized net actuarial loss
  
1,536
   
1,268
   
4,550
   
3,900
 
Pension plan actuarial loss
  
-
   
-
   
21
   
8,842
 
Net pension (income) expense
 
$
(1,762
)
 
$
(540
)
 
$
(5,144
)
 
$
7,061
 
 
Employer defined benefit pension plan contributions were $2.8 million and $3.2 million for the three months ended January 31, 2018 and 2017, respectively, and $8.4 million and $13.8 million for the nine months ended January 31, 2018 and 2017, respectively.

Contributions for employer defined contribution plans were approximately $3.4 million and $3.1 million for the three months ended January 31, 2018 and 2017, respectively, and $11.3 million and $11.6 million for the nine months ended January 31, 2018 and 2017, respectively.