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Employee Benefit Plans - Change in Fair Value of Level 3 Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Change in Fair Value Level 3 assets    
Fair value of plan assets at beginning of year $ 64,593 $ 58,648
Fair value of plan assets at end of year 75,791 64,593
Level 3    
Change in Fair Value Level 3 assets    
Fair value of plan assets at beginning of year 5,649 6,960
Redemptions (49) (4,336)
Purchases 200 2,800
Change in fair value (68) 225
Fair value of plan assets at end of year $ 5,732 $ 5,649