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Earnings Per Common Share - Additional Information (Details)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Split of common stock ratio 2    
Stock Options
     
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Number of Stock options 0 0 0