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COMMON STOCK - Summary of cash dividends per share (Details) - $ / shares |  |  |  |  |  |  | 12 Months Ended
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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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