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Defined Benefit Pension Plans (Tables)
3 Months Ended
Jul. 31, 2018
Retirement Benefits [Abstract]  
Pension Expenses

Pension expense consisted of the following (in thousands):

 

     Three months ended
July 31, 2018
     Three months ended
July 31, 2017
 

Service cost

   $ —        $ —    

Interest cost

     215        219  

Expected return on plan assets

     (362      (339

Recognition of net loss

     221        283  
  

 

 

    

 

 

 

Net periodic pension expense

   $ 74      $ 163