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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends declared on common stock (in dollars per share) $ 0.52 $ 0.52 $ 0.52