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Fair Value Measures and Disclosures - Nonrecurring Fair Value Measures Within Level 3 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Impairment of Assets | $ 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 |

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