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Employees' Savings Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Retirement Benefits [Abstract]      
Company expensed for plan $ 11,401 $ 11,723 $ 11,691
Defined Benefit Plan, Benefit Obligation 1,525 1,268  
Assets for Plan Benefits, Defined Benefit Plan 2,849 3,050  
Pension Cost (Reversal of Cost) $ 424 $ 55 $ 1,191