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Retirement Benefit Plans (Tables)
9 Months Ended
Mar. 31, 2020
Retirement Benefit Plans  
Schedule of net periodic pension expense

Three Months Ended March 31, 

Nine Months Ended March 31, 

    

2019

    

2020

    

2019

    

2020

Service cost

$

98

$

100

$

295

$

300

Interest cost

8

8

25

24

Amortization of prior service cost

14

13

 

42

 

39

Net periodic pension expense

$

120

$

121

$

362

$

363