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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends declared on common stock (in dollars per share) $ 0.2 $ 0.18 $ 0.17