Benefit Plans 4 (Details)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits [Member]
Assumptions used to determine benefit obligations at year end:
Discount rate	3.50%	2.80%
Assumptions used to determine net periodic benefit cost:
Discount rate	2.80%	2.30%
Expected return on plan assets	7.00%	7.00%
Postretirement Health Coverage [Member]
Assumptions used to determine benefit obligations at year end:
Discount rate	3.80%	3.30%
Assumptions used to determine net periodic benefit cost:
Discount rate	3.30%	2.90%