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COMMON STOCK - Summary of Cash Dividends Per Share (Details) - $ / shares									12 Months Ended
	Jun. 15, 2021	Apr. 30, 2021	Mar. 15, 2021	Feb. 04, 2021	Dec. 15, 2020	Oct. 30, 2020	Sep. 15, 2020	Aug. 19, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Class of Stock
Cash dividends declared per common share (in dollars per share)									$ 2.07	$ 1.39	$ 1.67
Common Class A
Class of Stock
Cash dividends declared per common share (in dollars per share)		$ 0.53		$ 0.53		$ 0.53		$ 0.48
Cash dividends paid per common share (in dollars per share)	$ 0.53		$ 0.53		$ 0.53		$ 0.48
Common Class B
Class of Stock
Cash dividends declared per common share (in dollars per share)		$ 0.53		$ 0.53		$ 0.53		$ 0.48
Cash dividends paid per common share (in dollars per share)	$ 0.53		$ 0.53		$ 0.53		$ 0.48

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Aggregate dividends paid during the period for each share of common stock outstanding.

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