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Retirement Benefit Plans (Tables)
6 Months Ended
Dec. 31, 2019
Retirement Benefit Plans  
Schedule of net periodic pension expense

Three Months Ended December 31, 

Six Months Ended December 31, 

    

2018

    

2019

    

2018

    

2019

Service cost

$

98

$

100

$

196

$

200

Interest cost

8

8

16

16

Amortization of prior service cost

14

13

 

28

 

26

Net periodic pension expense

$

120

$

121

$

240

$

242