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Capitalization And Short-Term Borrowings (Schedule Of Share-Based Compensation For Share Awards) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Schedule of Capitalization [Line Items]      
Number of Shares available for future grant [1] 3,220,528    
Performance Shares [Member]      
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 522,514    
Number of Shares Granted 254,608 244,734 208,588
Number of Awards Vested (231,246)    
Number of Shares Forfeited (11,040)    
Change in Units Based on Performance Achieved (57,792)    
Number of Shares Outstanding, End of Year 592,628 522,514  
Weighted Average Fair Value per Award, Beginning of Year $ 54.37    
Weighted Average Fair Value per Award Granted 43.32 $ 55.67 $ 50.95
Weighted Average Fair Value per Award Vested 55.33    
Weighted Average Fair Value per Award Forfeited 46.40    
Weighted Average Fair Value per Award, Change in Units Based on Performance Achieved 52.13    
Weighted Average Fair Value per Award, End of Year $ 49.18 $ 54.37  
Stock Appreciation Rights (SARs) [Member]      
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 733,132    
Number of Shares Granted 0 0 0
Number of Shares Exercised 0    
Number of Awards Vested 0 0 0
Number of Shares Forfeited 0    
Number of Shares Expired (219,952)    
Number of Shares Outstanding, End of Year 513,180 733,132  
Number of SARs exercisable 513,180    
Weighted Average Exercise Price, Outstanding Beginning of Year $ 54.90    
Weighted Average Exercise Price, Granted 0    
Weighted Average Exercise Price, Exercised 0    
Weighted Average Exercise Price, Forfeited 0    
Weighted Average Exercise Price, Expired 52.18    
Weighted Average Exercise Price, Outstanding End of Year 56.07 $ 54.90  
Weighted Average Exercise Price, SARs exercisable $ 56.07    
Weighted Average Remaining Contractual Life, Outstanding 1 year 3 months 10 days    
Weighted Average Remaining Contractual Life, SARs exercisable 1 year 3 months 10 days    
Aggregate Intrinsic Value Outstanding $ 0    
Aggregate Intrinsic Value, SARs exercisable $ 0    
[1] Includes shares available for options, SARs, restricted stock and performance share grants.