Pension and Other Postretirement Benefits (Details 5)	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Pension Plans
Weighted-average assumptions used to determine benefit obligations at fiscal year end
Discount rate	4.50%	4.47%
Rate of compensation increase	3.52%	3.57%
Weighted-average assumptions used to determine net periodic benefit cost for the fiscal year
Discount rate	4.48%	5.00%	4.50%
Expected long-term rate of return on plan assets	6.92%	7.00%	7.00%
Long-term rate of compensation increase	3.52%	3.57%	3.67%
Other Postretirement Plans
Weighted-average assumptions used to determine benefit obligations at fiscal year end
Discount rate	4.40%	4.27%
Weighted-average assumptions used to determine net periodic benefit cost for the fiscal year
Discount rate	4.26%	4.95%	4.50%
Expected long-term rate of return on plan assets	6.25%	7.00%	7.50%
Expected health care rate increase and the future rate and time at which it is expected to remain constant
Assumed health care cost trend rate	7.50%	7.50%
Rate to which the cost trend rate is assumed to decline and remain (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2021	2020