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Employee Benefit Plans - Net periodic pension expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Employee Benefit Plans      
Interest cost on benefit obligation $ 1,682 $ 2,112 $ 2,407
Expected return on plan assets (3,660) (3,144) (2,842)
Amortization of net actuarial loss and prior service costs 560 515 465
Net periodic pension (income) expense $ (1,418) $ (517) $ 30