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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Net Periodic Benefit Costs    
Service cost $ 100 $ 98
Interest cost 8 8
Amortization of prior service cost 13 14
Net periodic pension expense 121 120
Contributions made by the entity to the defined benefit plans 0 0
Contributions made by the entity to defined contribution plans $ 1,800 $ 1,800