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Employee Benefit Plans - Net periodic pension expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Employee Benefit Plans      
Interest cost on benefit obligation $ 2,112 $ 2,407 $ 2,157
Expected return on plan assets (3,144) (2,842) (3,236)
Amortization of net actuarial loss and prior service costs 515 465 453
Net periodic pension expense (income) $ (517) $ 30 $ (626)