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Employee Benefit Plans - Changes in projected benefit obligation, plan assets and funded status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Change in projected benefit obligation      
Projected benefit obligation at beginning of year $ 68,527 $ 61,557  
Interest cost 2,112 2,407 $ 2,157
Benefits paid (2,000) (1,758)  
Actuarial loss 10,714 6,321  
Projected benefit obligation at end of year 79,353 68,527 61,557
Change in plan assets      
Fair value of plan assets at beginning of year 64,593 58,648  
Actual return on plan assets 10,821 6,861  
Employer contributions 2,377 842  
Benefits paid (2,000) (1,758)  
Fair value of plan assets at end of year 75,791 64,593 $ 58,648
Funded status at end of year $ (3,562) $ (3,934)