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Cash Dividends (Narrative) (Details) (USD $)
0 Months Ended 9 Months Ended 12 Months Ended
May 25, 2012
Jun. 30, 2012
Sep. 30, 2011
Quarterly [Member]
Sep. 30, 2011
Annually [Member]
Dividends Payable [Line Items]        
Cash dividends, declaration date   May 25, 2012    
Cash dividends declared, per share $ 0.55      
Cash dividends, payment date   Jul. 03, 2012    
Cash dividend paid, per share     $ 0.55 $ 2.20
Cash dividends, record date   Jun. 08, 2012