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Fair Value Measures and Disclosures - Nonrecurring Fair Value Measures Within Level 3 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Impairment of Assets | $ 0 | $ 200,696 | $ 141,802 | $ 200,696 |
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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