EMPLOYEE BENEFIT PLANS (Weighted-Average Assumptions Used to Estimate the Net Periodic Pension and Other Postretirement Benefit Costs) (Details)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Retirement Health Care [Member] | Retirement Health Care Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.66%	3.42%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.42%	4.16%	4.00%
Retirement Income Plans [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.70%	3.42%
Rate of compensation increase	2.83%	2.92%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.42%	4.20%	4.05%
Rate of compensation increase	2.92%	3.37%	4.46%
Expected return on plan assets	4.73%	4.34%	5.28%