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Retirement Plans
 3 Months Ended
Jul. 31, 2019
Retirement Plans [Abstract]  
Retirement Plans
Note 14 — Retirement Plans

The components of net pension income for our global defined benefit plans were as follows:


  
Three Months Ended
July 31,
  
   
2019
    
2018
  
Service cost
  
$
224
    
$
233
  
Interest cost
    
5,834
      
6,212
  
Expected return on plan assets
    
(10,059
)
    
(9,902
)
Net amortization of prior service cost
    
(19
)
    
(24
)
Unrecognized net actuarial loss
    
1,600
      
1,434
  
Net pension income
  
$
(2,420
)
  
$
(2,047
)

Employer defined benefit pension plan contributions were $4.7 million and $3.6 million for the three months ended July 31, 2019 and 2018, respectively.

The expense for employer defined contribution plans was $4.3 million and $4.5 million for the three months ended July 31, 2019 and 2018, respectively.