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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Net Periodic Benefit Costs        
Service costs $ 98 $ 216 $ 196 $ 432
Interest costs 8 8 16 16
Amortization of prior service costs 14 70 28 140
Net periodic pension expense 120 294 240 588
Contributions made by the entity to the defined benefit plans 1,000 0 1,000 1,000
Contributions made by the entity to defined contribution plans $ 1,300 $ 1,400 $ 3,100 $ 3,000