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Dividends (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Dividends [Abstract]        
Cash dividends per share (in dollars per share) $ 0.09 $ 0.08 $ 0.17 $ 0.16