Summary Of Significant Accounting Policies (Reclassification Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Operating Revenues	$ 701,720	$ 551,115	$ 1,248,277	$ 992,275
Income Before Income Taxes	224,786	152,646	402,076	259,837
Income Tax Expense	(57,458)	(40,210)	(102,356)	(69,627)
Net Income Available for Common Stock	167,328	112,436	299,720	190,210
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Income Before Income Taxes	(130,221)	(3,666)	(292,809)	(3,977)
Income Tax Expense	35,641	1,010	80,141	1,096
Net Income Available for Common Stock	(94,580)	(2,656)	(212,668)	(2,881)
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member] | Commodity Contracts [Member] | Gains And Losses On Derivative Financial Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Operating Revenues	(130,271)	(3,761)	(292,899)	(4,071)
Foreign Currency Contracts [Member] | Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member] | Gains And Losses On Derivative Financial Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Operating Revenues	$ 50	$ 95	$ 90	$ 94