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COMMON STOCK - Summary of cash dividends per share (Details) - $ / shares							12 Months Ended
	Mar. 16, 2020	Feb. 05, 2020	Dec. 16, 2019	Oct. 30, 2019	Sep. 16, 2019	Aug. 16, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Class of Stock
Cash dividends declared per common share (in dollars per share)							$ 1.39	$ 1.67	$ 1.48
Common Class A
Class of Stock
Cash dividends declared per common share (in dollars per share)		$ 0.48		$ 0.48		$ 0.43
Cash dividends paid per common share (in dollars per share)	$ 0.48		$ 0.48		$ 0.43
Common Class B
Class of Stock
Cash dividends declared per common share (in dollars per share)		$ 0.48		$ 0.48		$ 0.43
Cash dividends paid per common share (in dollars per share)	$ 0.48		$ 0.48		$ 0.43

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