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Retirement Plan And Other Post-Retirement Benefits (Schedule Of Significant Unobservable Input Changes In Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year $ 2,782 $ 29,329
Realized Gains/(Losses)   5,524
Unrealized Gains/(Losses) 384 (5,505)
Sales   (26,566)
Balance, End of Year 3,166 2,782
Hedge Funds Investments [Member] | Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year 0 26,490
Realized Gains/(Losses)   5,878
Unrealized Gains/(Losses) 0 (5,445)
Sales   (26,923)
Balance, End of Year 0 0
Real Estate [Member] | Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year 2,970 4,724
Realized Gains/(Losses)   0
Unrealized Gains/(Losses) 421 (404)
Sales   (1,350)
Balance, End of Year 3,391 2,970
Excluding 401(h) Investments [Member] | Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year (188) (1,885)
Realized Gains/(Losses)   (354)
Unrealized Gains/(Losses) (37) 344
Sales   1,707
Balance, End of Year (225) (188)
401(h) Investments [Member] | Other Post-Retirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year 188 1,885
Realized Gains/(Losses)   354
Unrealized Gains/(Losses) 37 (344)
Sales   (1,707)
Balance, End of Year $ 225 $ 188