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Fair Value Measures and Disclosures - Nonrecurring Fair Value Measures Within Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Impairment of Assets $ 0 $ 0 $ 141,802 $ 0  
Level 3 | Fair Value, Nonrecurring | Exploration and Production          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Impairment of Assets     $ 33,453 $ 0  
Property, plant, and equipment, fair value         $ 12,880