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Employee Benefit Plan (Assumptions Used in Calculating Net Pension Expense) (Details)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Retirement Benefits [Abstract]      
Discount rate 3.70% 3.40% 4.25%
Expected long-term rate of return on assets 6.75% 7.00% 7.00%
Increase in compensation levels 4.00% 4.00% 4.00%