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Employee Benefit Plans - Sensitivity in Results (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2020
USD ($)
Retirement Benefits [Abstract]  
Effect on total service and interest cost components of one percent increase $ 50
Effect on accumulated postretirement benefit obligation of one percent increase 0
Effect on total of service and interest cost components of one percent decrease (43)
Effect on accumulated postretirement benefit obligation of one percent decrease $ 0