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Income Taxes (Details Textual)
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Income Taxes (Textual) [Abstract]        
Effective income tax rate 34.70% 35.40% 34.30% 35.50%