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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared and paid, quarterly, per as-converted share (USD per share) $ 0.195 $ 0.25 $ 0.21 $ 0.165