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Capitalization And Short-Term Borrowings (Schedule Of Share-Based Compensation For Restricted Stock Units) (Details) - Non-Performance Based Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 365,481    
Number of Shares Granted 128,950 172,513 150,839
Number of Awards Vested (129,169)    
Number of Shares Forfeited (17,835)    
Number of Shares Outstanding, End of Year 347,427 365,481  
Weighted Average Fair Value per Award, Beginning of Year $ 41.45    
Weighted Average Fair Value per Award Granted 54.10 $ 37.98 $ 40.38
Weighted Average Fair Value per Award Vested 45.24    
Weighted Average Fair Value per Award Forfeited 44.61    
Weighted Average Fair Value per Award, End of Year $ 44.58 $ 41.45