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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Net Periodic Benefit Costs        
Service cost $ 216 $ 224 $ 432 $ 448
Interest cost 8 7 16 14
Amortization of prior service cost 70 70 140 140
Net periodic pension expense 294 301 588 602
Contributions made by the entity to the defined benefit plans 300 1,000 1,000 1,000
Contributions made by the entity to defined contribution plans $ 1,400 $ 1,000 $ 3,000 $ 2,200