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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, 2020
Sep. 30, 2019
Sep. 30, 2018
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    
Weighted Average Fair Value per Award Vested 0    
Weighted Average Fair Value per Award Forfeited 0    
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 281,607    
Number of Shares Granted 150,839 123,939 89,672
Number of Awards Vested (87,835)    
Number of Shares Forfeited (8,838)    
Number of Shares Outstanding, End of Year 335,773 281,607  
Weighted Average Fair Value per Award, Beginning of Year $ 48.88    
Weighted Average Fair Value per Award Granted 40.38 $ 49.40 $ 51.23
Weighted Average Fair Value per Award Vested 50.26    
Weighted Average Fair Value per Award Forfeited 46.72    
Weighted Average Fair Value per Award, End of Year $ 44.76 $ 48.88