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Capitalization (Details)
6 Months Ended
Mar. 31, 2017
shares
Debt Instrument [Line Items]  
Common stock shares issued due to stock option exercises 31,446
Issue shares of common stock for the Direct Stock Purchase and Dividend Reinvestment Plan 90,361
Issue shares of common stock for the 401(k) plans 51,727
Shares tendered 45,740
Restricted Stock Units [Member]  
Debt Instrument [Line Items]  
Common stock issued 74,547
Performance Shares [Member]  
Debt Instrument [Line Items]  
Common stock issued 43,484
Board Of Directors [Member]  
Debt Instrument [Line Items]  
Common stock issued 10,357