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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Net Periodic Benefit Costs        
Service cost $ 100 $ 98 $ 300 $ 295
Interest cost 8 8 24 25
Amortization of prior service cost 13 14 39 42
Net periodic pension expense 121 120 363 362
Contributions made by the entity to the defined benefit plans 0 0 0 1,000
Contributions made by the entity to defined contribution plans $ 1,800 $ 1,600 $ 5,000 $ 4,700