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Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Condensed Consolidated Statements of Stockholders' Equity        
Cash dividends per share $ 0.1625 $ 0.1425 $ 0.3050 $ 0.2675