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v3.24.3

Supplementary Information for Exploration and Production Activities - Principal Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Standardized Measure of Discounted Future Net Cash Flows [Roll Forward] |  |  |
Standardized Measure of Discounted Future Net Cash Flows at Beginning of Year | $ 2,572,108 | $ 5,448,330 | $ 2,353,572
Sales, Net of Production Costs | (456,506) | (767,487) | (1,572,402)
Net Changes in Prices, Net of Production Costs | (1,829,714) | (3,918,392) | 4,132,889
Extensions and Discoveries | (11,007) | 237,057 | 1,355,257
Changes in Estimated Future Development Costs | 32,990 | (222,233) | (32,160)
Purchases of Minerals in Place | 0 | 34,346 | 0
Sales of Minerals in Place | 0 | 0 | (311,308)
Previously Estimated Development Costs Incurred | 305,602 | 342,024 | 154,253
Net Change in Income Taxes at Applicable Statutory Rate | 462,075 | 959,728 | (1,180,349)
Revisions of Previous Quantity Estimates | 19,216 | 33,192 | 3,316
Accretion of Discount and Other | 241,691 | 425,543 | 545,262
Standardized Measure of Discounted Future Net Cash Flows at End of Year | $ 1,336,455 | $ 2,572,108 | $ 5,448,330

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