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Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Stockholders Equity [Abstract]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.1425 $ 0.1250 $ 0.2675 $ 0.2350