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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Net Periodic Benefit Costs    
Service cost $ 204 $ 288
Interest cost 9  
Amortization of prior service cost 105 202
Net periodic pension expense 318 490
Contributions made by the entity to the defined benefit plans 0 1,000
Contributions made by the entity to defined contribution plans $ 1,100 $ 1,200