STOCK PROGRAMS - Performance Share Units Based on Total Stockholder Return (Details) - Common Class A - shares	1 Months Ended	12 Months Ended
	Aug. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Common Stock issued (in shares)		5,087,400	5,038,500	3,411,900
Performance Share Units Based on Total Stockholder Return
Share-based Compensation Arrangement by Share-based Payment Award
Common Stock issued (in shares)	30,267