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Employee Benefit Plans - Net periodic pension expense (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]      
Service cost-benefits earned during the year $ 0 $ 845 $ 2,939
Interest cost on benefit obligation 2,157 2,045 2,893
Expected return on plan assets (3,236) (3,389) (3,177)
Amortization of net actuarial loss and prior service costs 453 672 1,784
Curtailment expense 0 16 0
Settlement expense 0 1,702 0
Net periodic pension expense (benefit) $ (626) $ 1,891 $ 4,439