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Employee Benefit Plan (Assumptions Used in Calculating Net Pension Expense) (Details)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]      
Discount rate 3.40% 4.25% 4.05%
Expected long-term rate of return on assets 7.00% 7.00% 7.25%
Increase in compensation levels 4.00% 4.00% 4.00%