Fair Value Measures and Disclosures (Schedule of Nonrecurring Fair Value Measures Within Level 3) (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Impairment of Assets	[1]	$ 0	$ 141,802
Level 3 | Fair Value, Nonrecurring | Integrated Upstream and Gathering
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Impairment of Assets		$ 0	33,453
Property, plant, and equipment, fair value			$ 12,880

[1] The Company considers this line to be a significant expense.