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SHAREHOLDER'S EQUITY - Cash Dividends (Details) - $ / shares |  |  |  | 3 Months Ended | 9 Months Ended
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Jun. 05, 2019 | Jun. 03, 2019 | Mar. 06, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |
Cash dividends declared, per share (in dollars per share) | $ 0.71 |  | $ 0.71 | $ 0.71 | $ 0.71 | $ 2.13 | $ 2.11
Cash dividend paid, per share (in dollars per share) |  | $ 0.71 |  |  |  |  |

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