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Retirement Benefit Plans (Tables)
3 Months Ended
Sep. 30, 2018
Retirement Benefit Plans  
Schedule of net periodic pension expense

The components of net periodic pension expense are as follows (in thousands):

 

 

 

 

 

 

 

 

 

 

Three Months Ended September 30,

 

    

2017

    

2018

Service cost

 

$

216

 

$

98

Interest cost

 

 

 8

 

 

 8

Amortization of prior service cost

 

 

70

 

 

14

Net periodic pension expense

 

$

294

 

$

120