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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, 2019
Sep. 30, 2018
Sep. 30, 2017
Schedule of Capitalization [Line Items]      
Number of Shares available for future grant [1] 1,225,831    
Performance Shares [Member]      
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 641,290    
Number of Shares Granted 244,734 208,588 184,148
Number of Awards Vested (281,882)    
Number of Shares Forfeited (109,806)    
Change in Units Based on Performance Achieved (28,178)    
Number of Shares Outstanding, End of Year 522,514 641,290  
Weighted Average Fair Value per Award, Beginning of Year $ 44.49    
Weighted Average Fair Value per Award Granted 55.67 $ 50.95 $ 56.39
Weighted Average Fair Value per Award Vested 31.16    
Weighted Average Fair Value per Award Forfeited 54.19    
Weighted Average Fair Value per Award, Change in Units Based on Performance Achieved 35.14    
Weighted Average Fair Value per Award, End of Year $ 54.37 $ 44.49  
Stock Appreciation Rights (SARs) [Member]      
Schedule of Capitalization [Line Items]      
Number of Shares Outstanding, Beginning of Year 1,299,088    
Number of Shares Granted 0 0 0
Number of Shares Exercised (528,456)    
Number of Awards Vested 0 0 (5,000)
Number of Shares Forfeited 0    
Number of Shares Expired (37,500)    
Number of Shares Outstanding, End of Year 733,132 1,299,088  
Number of SARs exercisable 733,132    
Weighted Average Exercise Price, Outstanding Beginning of Year $ 50.70    
Weighted Average Exercise Price, Granted 0    
Weighted Average Exercise Price, Exercised 43.94    
Weighted Average Exercise Price, Forfeited 0    
Weighted Average Exercise Price, Expired 63.87    
Weighted Average Exercise Price, Outstanding End of Year 54.90 $ 50.70  
Weighted Average Exercise Price, SARs exercisable $ 54.90    
Weighted Average Remaining Contractual Life, Outstanding 1 year 8 months 23 days    
Weighted Average Remaining Contractual Life, SARs exercisable 1 year 8 months 23 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.