v3.26.1
Fair Value Measurements (Schedule of Nonrecurring Fair Value Measures Within Level 3) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Impairment of Assets $ 0 $ 0 $ 0 $ 141,802 [1]  
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.