Postretirement Benefits (Net Periodic Benefit Costs Assumptions) (Details) - Postretirement Benefits [Member]	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.02%	4.57%	3.78%
Pre Medicare [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	7.50%	8.00%	10.00%
Medicare [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	6.75%	7.00%	7.00%