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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Change in projected benefit obligation      
Projected benefit obligation at beginning of year $ 63,260 $ 75,664  
Service cost 0 845 $ 2,939
Interest cost 2,157 2,045 2,893
Benefits paid (2,196) (1,521)  
Actuarial (gain) loss (1,664) (1,448)  
Liability (gain) due to curtailment 0 (6,822)  
Settlement payments 0 (5,503)  
Projected benefit obligation at end of year 61,557 63,260 75,664
Change in plan assets      
Fair value of plan assets at beginning of year 57,110 54,293  
Actual return on plan assets 965 5,647  
Employer contributions 2,768 4,194  
Benefits paid (2,195) (1,521)  
Settlement payments 0 (5,503)  
Fair value of plan assets at end of year 58,648 57,110 $ 54,293
Funded status at end of year $ (2,909) $ (6,150)