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Capitalization And Short-Term Borrowings (Schedule Of Share-Based Compensation For Restricted Stock Units) (Details) - $ / shares
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Restricted Share Awards [Member]      
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 20,000    
Number of Shares Granted 0 0 0
Number of Awards Vested 0    
Number of Shares Forfeited 0    
Number of Shares Outstanding, End of Year 20,000 20,000  
Weighted Average Fair Value per Award, Beginning of Year $ 47.46    
Weighted Average Fair Value per Award Granted 0.00    
Weighted Average Fair Value per Award Vested 0.00    
Weighted Average Fair Value per Award Forfeited 0.00    
Weighted Average Fair Value per Award, End of Year $ 47.46 $ 47.46  
Non-Performance Based Restricted Stock Units (RSUs) [Member]      
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 239,151    
Number of Shares Granted 87,143 101,943 88,899
Number of Awards Vested (80,530)    
Number of Shares Forfeited (12,565)    
Number of Shares Outstanding, End of Year 233,199 239,151  
Weighted Average Fair Value per Award, Beginning of Year $ 49.67    
Weighted Average Fair Value per Award Granted 52.13 $ 35.89 $ 64.04
Weighted Average Fair Value per Award Vested 53.38    
Weighted Average Fair Value per Award Forfeited 53.75    
Weighted Average Fair Value per Award, End of Year $ 48.99 $ 49.67