OTHER CONTINGENCIES AND GUARANTEES (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Loss Contingencies [Line Items]
Liability for aggregate future remediation costs	$ 28,000,000	$ 28,000,000
Letter of credit	9,000,000	10,000,000
Letter of credit, amount outstanding	0	0
Dickinson County, Michigan Matter [Member]
Loss Contingencies [Line Items]
Liability for aggregate future remediation costs	$ 12,000,000	12,000,000
Remediation period	30 years
Percentage of liability for aggregate remediation and associated costs, other than legal fees	24.30%
Alameda County, California Matter [Member]
Loss Contingencies [Line Items]
Liability for aggregate future remediation costs	$ 14,000,000	$ 14,000,000
Remediation period	30 years
Maximum undiscounted costs	$ 28,000,000