Capitalization And Short-Term Borrowings (Schedule Of Share-Based Compensation For Stock Options And Share Awards) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		19,000
Number of Shares Granted		0
Number of Shares Exercised		(19,000)
Number of Shares Forfeited		0
Number of Shares Outstanding, End of Year		0	19,000
Number of Option shares exercisable		0
Number of Shares Subject to Option, Option shares available for future grant	[1]	2,182,243
Weighted Average Exercise Price, Outstanding Beginning of Year		$ 39.48
Weighted Average Exercise Price, Granted		0.00
Weighted Average Exercise Price, Exercised		39.48
Weighted Average Exercise Price, Forfeited		0.00
Weighted Average Exercise Price, Outstanding End of Year		0.00	$ 39.48
Weighted Average Exercise Price, Option shares exercisable		$ 0.00
Weighted Average Remaining Contractual Life, Outstanding		0 years
Weighted Average Remaining Contractual Life, Option shares exercisable		0 years
Aggregate Intrinsic Value Outstanding		$ 0
Aggregate Intrinsic Value, Option Shares exercisable		$ 0
Performance Shares [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		438,234
Number of Shares Granted		184,148	309,996	107,044
Number of Awards Vested		(43,484)
Number of Shares Forfeited		(51,150)
Number of Shares Outstanding, End of Year		527,748	438,234
Weighted Average Fair Value per Award, Beginning of Year		$ 44.98
Weighted Average Fair Value per Award Granted		56.39	$ 30.71	$ 65.26
Weighted Average Fair Value per Award Vested		69.13
Weighted Average Fair Value per Award Forfeited		60.74
Weighted Average Fair Value per Award, End of Year		$ 45.44	$ 44.98
Stock Appreciation Rights (SARs) [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		1,590,988
Number of Shares Granted		0	0	0
Number of Shares Exercised		(82,077)
Number of Awards Vested		(5,000)	(113,082)	(157,386)
Number of Shares Forfeited		0
Number of Shares Expired		(3,000)
Number of Shares Outstanding, End of Year		1,505,911	1,590,988
Number of SARs exercisable		1,505,911
Weighted Average Exercise Price, Outstanding Beginning of Year		$ 48.19
Weighted Average Exercise Price, Granted		0.00
Weighted Average Exercise Price, Exercised		39.77
Weighted Average Exercise Price, Forfeited		0.00
Weighted Average Exercise Price, Expired		52.10
Weighted Average Exercise Price, Outstanding End of Year		48.64	$ 48.19
Weighted Average Exercise Price, SARs exercisable		$ 48.64
Weighted Average Remaining Contractual Life, Outstanding		2 years 6 months 6 days
Weighted Average Remaining Contractual Life, SARs exercisable		2 years 6 months 6 days
Aggregate Intrinsic Value Outstanding		$ 13,144
Aggregate Intrinsic Value, SARs exercisable		$ 13,144

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