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Employees' Savings Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Retirement Benefits [Abstract]      
Company expensed for plan $ 10,710 $ 11,401 $ 11,723
Defined Benefit Plan, Benefit Obligation 2,743 1,525  
Assets for Plan Benefits, Defined Benefit Plan 3,403 2,849  
Pension Cost (Reversal of Cost) $ 399 $ 424 $ 55