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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Net Periodic Benefit Costs        
Service cost $ 100 $ 98 $ 200 $ 196
Interest cost 8 8 16 16
Amortization of prior service cost 13 14 26 28
Net periodic pension expense 121 120 242 240
Contributions made by the entity to the defined benefit plans 0 1,000 0 1,000
Contributions made by the entity to defined contribution plans $ 1,400 $ 1,300 $ 3,200 $ 3,100