Financial Instruments (Schedule Of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2022		Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss)	$ (200,084)		$ (201,498)	$ (678,558)		$ (187,850)
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	298,371		13,129	591,180		17,106
Foreign Currency Contracts [Member] | Operating Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss)	(1,257)		616	(616)		3,792
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(1)		(152)	(91)		(245)
Commodity Contracts [Member] | Operating Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss)	(198,827)		(202,114)	(677,942)		(191,642)
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	298,372	[1]	$ 13,281	591,271	[1]	$ 17,351
Commodity Contracts [Member] | Operating Revenues [Member] | California Asset Sale [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Loss Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income for Discontinuance of Cash Flow Hedges	$ (44,600)			$ (44,600)

[1] On June 30, 2022, the Company completed the sale of Seneca's California assets. Because of this sale, the Company terminated its remaining crude oil derivative contracts and discontinued hedge accounting for such contracts. A loss of $44.6 million was reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet to Operating Revenues on the Consolidated Statement of Income for the three and nine months ended June 30, 2022. This loss is included in the reported reclassification amounts.