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Capitalization (Details)
3 Months Ended
Dec. 31, 2016
shares
Debt Instrument [Line Items]  
Common stock shares issued due to stock option exercises 19,000
Issue shares of common stock for the Direct Stock Purchase and Dividend Reinvestment Plan 46,352
Shares tendered 41,151
Issue shares of common stock for the 401(k) plans 26,995
Restricted Stock Units [Member]  
Debt Instrument [Line Items]  
Common stock issued 74,047
Performance Shares [Member]  
Debt Instrument [Line Items]  
Common stock issued 43,484
Board Of Directors [Member]  
Debt Instrument [Line Items]  
Common stock issued 4,957