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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Net periodic benefit costs        
Service cost $ 224 $ 212 $ 448 $ 425
Interest cost 7 8 14 17
Amortization of prior service cost 70 105 140 210
Net periodic pension expense 301 325 602 652
Contributions made by the entity to the defined benefit plans 1,000 200 1,000 200
Contributions made by the entity to defined contribution plans $ 1,000 $ 1,200 $ 2,200 $ 2,300