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, 2018	Sep. 30, 2017	Sep. 30, 2016
Schedule of Capitalization [Line Items]
Number of Shares Exercised		75,971
Number of Shares available for future grant	[1]	1,478,086
Performance Shares [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		527,748
Number of Shares Granted		208,588	184,148	309,996
Number of Awards Vested		(79,079)
Number of Shares Forfeited		(15,967)
Number of Shares Outstanding, End of Year		641,290	527,748
Weighted Average Fair Value per Award, Beginning of Year		$ 45.44
Weighted Average Fair Value per Award Granted		50.95	$ 56.39	$ 30.71
Weighted Average Fair Value per Award Vested		65.38
Weighted Average Fair Value per Award Forfeited		57.15
Weighted Average Fair Value per Award, End of Year		$ 44.49	$ 45.44
Stock Appreciation Rights (SARs) [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		1,505,911
Number of Shares Granted		0	0	0
Number of Shares Exercised		(206,823)
Number of Awards Vested		0	(5,000)	(113,082)
Number of Shares Forfeited		0
Number of Shares Expired		0
Number of Shares Outstanding, End of Year		1,299,088	1,505,911
Number of SARs exercisable		1,299,088
Weighted Average Exercise Price, Outstanding Beginning of Year		$ 48.64
Weighted Average Exercise Price, Granted		0.00
Weighted Average Exercise Price, Exercised		35.70
Weighted Average Exercise Price, Forfeited		0.00
Weighted Average Exercise Price, Expired		0.00
Weighted Average Exercise Price, Outstanding End of Year		50.70	$ 48.64
Weighted Average Exercise Price, SARs exercisable		$ 50.70
Weighted Average Remaining Contractual Life, Outstanding		1 year 9 months 6 days
Weighted Average Remaining Contractual Life, SARs exercisable		1 year 9 months 6 days
Aggregate Intrinsic Value Outstanding		$ 8,199
Aggregate Intrinsic Value, SARs exercisable		$ 8,199

[1] Includes shares available for options, SARs, restricted stock and performance share grants.