Employee Benefit Plans (Pension Plan Asset Allocation by Asset Category) (Details)	Jun. 30, 2018	Jun. 30, 2017
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%	1.00%
United States Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	52.00%	36.00%
United States Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	14.00%	19.00%
International Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	12.00%	16.00%
Global Equity Securities [Domain]
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset allocations	22.00%	28.00%