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Employees' Savings Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Retirement Benefits [Abstract]      
Company expensed for plan $ 11,723 $ 11,691 $ 9,073
Defined Benefit Plan, Benefit Obligation 1,268 1,658  
Assets for Plan Benefits, Defined Benefit Plan 3,050 3,920  
Pension Cost (Reversal of Cost) $ 55 $ 1,191 $ 1,820