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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, 2016
Sep. 30, 2015
Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year $ 29,329 $ 46,096
Realized Gains/(Losses) 5,524 2,149
Unrealized Gains/(Losses) (5,505) 1,085
Purchases   77
Sales (26,566) (20,078)
Balance, End of Year 2,782 29,329
Hedge Funds Investments [Member] | Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year 26,490 45,213
Realized Gains/(Losses) 5,878 2,284
Unrealized Gains/(Losses) (5,445) 317
Purchases   0
Sales (26,923) (21,324)
Balance, End of Year 0 26,490
Real Estate [Member] | Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year 4,724 3,792
Realized Gains/(Losses) 0 0
Unrealized Gains/(Losses) (404) 871
Purchases   82
Sales (1,350) (21)
Balance, End of Year 2,970 4,724
Excluding 401(h) Investments [Member] | Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year (1,885) (2,909)
Realized Gains/(Losses) (354) (135)
Unrealized Gains/(Losses) 344 (103)
Purchases   (5)
Sales 1,707 1,267
Balance, End of Year (188) (1,885)
Including 401(h) Investments [Member] | Other Post-Retirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance, Beginning of Year 1,885 2,909
Realized Gains/(Losses) 354 135
Unrealized Gains/(Losses) (344) 103
Purchases   5
Sales (1,707) (1,267)
Balance, End of Year $ 188 $ 1,885