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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Net Periodic Benefit Costs    
Service costs $ 98 $ 216
Interest costs 8 8
Amortization of prior service costs 14 70
Net periodic pension expense 120 294
Contributions made by the entity to the defined benefit plans 0 700
Contributions made by the entity to defined contribution plans $ 1,800 $ 1,600