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, 2016	Sep. 30, 2015	Sep. 30, 2014
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		306,500
Number of Shares Granted		0
Number of Shares Exercised		(287,500)
Number of Shares Forfeited		0
Number of Shares Outstanding, End of Year		19,000	306,500
Number of Option shares exercisable		19,000
Number of Shares Subject to Option, Option shares available for future grant	[1]	2,714,005
Weighted Average Exercise Price, Outstanding Beginning of Year		$ 37.73
Weighted Average Exercise Price, Granted		0.00
Weighted Average Exercise Price, Exercised		37.62
Weighted Average Exercise Price, Forfeited		0.00
Weighted Average Exercise Price, Outstanding End of Year		39.48	$ 37.73
Weighted Average Exercise Price, Option shares exercisable		$ 39.48
Weighted Average Remaining Contractual Life, Outstanding		2 months 7 days
Weighted Average Remaining Contractual Life, Option shares exercisable		2 months 7 days
Aggregate Intrinsic Value Outstanding		$ 277
Aggregate Intrinsic Value, Option Shares exercisable		$ 277
Performance Shares [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		204,742
Number of Shares Granted		309,996	107,044	116,090
Number of Awards Vested		0
Number of Shares Forfeited		(76,504)
Number of Shares Outstanding, End of Year		438,234	204,742
Weighted Average Fair Value per Award, Beginning of Year		$ 66.17
Weighted Average Fair Value per Award Granted		30.71	$ 65.26	$ 67.16
Weighted Average Fair Value per Award Vested		0.00
Weighted Average Fair Value per Award Forfeited		43.89
Weighted Average Fair Value per Award, End of Year		$ 44.98	$ 66.17
Stock Appreciation Rights (SARs) [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year		1,732,784
Number of Shares Granted		0	0	0
Number of Shares Exercised		(96,796)
Number of Awards Vested		(113,082)	(157,386)	(323,188)
Number of Shares Forfeited		0
Number of Shares Expired		(45,000)
Number of Shares Outstanding, End of Year		1,590,988	1,732,784
Number of SARs exercisable		1,585,988
Weighted Average Exercise Price, Outstanding Beginning of Year		$ 48.70
Weighted Average Exercise Price, Granted		0.00
Weighted Average Exercise Price, Exercised		52.02
Weighted Average Exercise Price, Forfeited		0.00
Weighted Average Exercise Price, Expired		59.48
Weighted Average Exercise Price, Outstanding End of Year		48.19	$ 48.70
Weighted Average Exercise Price, SARs exercisable		$ 48.16
Weighted Average Remaining Contractual Life, Outstanding		3 years 11 months 10 days
Weighted Average Remaining Contractual Life, SARs exercisable		3 years 11 months 6 days
Aggregate Intrinsic Value Outstanding		$ 9,356
Aggregate Intrinsic Value, SARs exercisable		$ 9,369

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