Pension and Other Postretirement Benefits - Schedule of Weighted-average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Details)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	4.48%	5.00%
Expected long-term rate of return on plan assets	6.92%	6.92%	7.00%
Long-term rate of compensation increase	3.49%	3.52%	3.57%
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	4.26%	4.95%
Expected long-term rate of return on plan assets	6.25%	6.25%	7.00%