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Employee Benefit Plans - Change in Accumulated Other Comprehensive (Income) Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive (Income) Loss Related to Pension Plan      
Balance at beginning of period $ (20,050) $ (18,213)  
Amortization of net actuarial loss and prior service costs 515 465  
Current period net actuarial (loss) (3,036) (2,302)  
Net change (2,521) (1,837) $ (154)
Balance at end of period $ (22,571) $ (20,050) $ (18,213)