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, 2021	Sep. 30, 2020	Sep. 30, 2019
Performance Shares [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year	592,628
Number of Shares Granted	309,470	254,608	244,734
Number of Awards Vested	(165,161)
Number of Shares Forfeited	(136,303)
Number of Shares Outstanding, End of Year	600,634	592,628
Weighted Average Fair Value per Award, Beginning of Year	$ 49.18
Weighted Average Fair Value per Award Granted	39.19	$ 43.32	$ 55.67
Weighted Average Fair Value per Award Vested	50.99
Weighted Average Fair Value per Award Forfeited	42.15
Weighted Average Fair Value per Award, End of Year	$ 45.13	$ 49.18
Stock Appreciation Rights (SARs) [Member]
Schedule of Capitalization [Line Items]
Number of Shares Outstanding, Beginning of Year	513,180
Number of Shares Granted	0	0	0
Number of Shares Exercised	0	0
Number of Awards Vested	0	0	0
Number of Shares Forfeited	0
Number of Shares Expired	(194,735)
Number of Shares Outstanding, End of Year	318,445	513,180
Number of SARs exercisable	318,445
Weighted Average Exercise Price, Outstanding Beginning of Year	$ 56.07
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	0
Weighted Average Exercise Price, Forfeited	0
Weighted Average Exercise Price, Expired	60.10
Weighted Average Exercise Price, Outstanding End of Year	53.60	$ 56.07
Weighted Average Exercise Price, SARs exercisable	$ 53.60
Weighted Average Remaining Contractual Life, Outstanding	10 months 24 days
Weighted Average Remaining Contractual Life, SARs exercisable	10 months 24 days
Aggregate Intrinsic Value Outstanding	$ 0
Aggregate Intrinsic Value, SARs exercisable	$ 0