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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Preferred Stock      
Preferred stock, dividend rate (percent)     5.00%
Common Stock      
Common stock dividends (in dollars per share) $ 0.37 $ 0.24 $ 0.16