Postretirement Benefits (Net Periodic Benefit Costs Assumptions) (Details) (Postretirement Benefits [Member])	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.57%	3.78%	5.29%
Pre Medicare [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	8.00%	10.00%	10.00%
Medicare [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	7.00%	7.00%	10.00%