Employee Benefit Plans (Pension Plan Asset Allocation by Asset Category) (Details)	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	100.00%	100.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	1.00%	3.00%
United States Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	36.00%	42.00%
United States Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	19.00%	18.00%
International Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	16.00%	14.00%
Global Equity Securities [Domain]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	28.00%	23.00%