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Supplementary Information for Exploration and Production Activities - Costs Incurred in Property Acquisition, Exploration and Development Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Property Acquisition Costs: |  |  |  |
Proved |  | $ 17,069 | $ 33,190 | $ 2,491
Unproved |  | 19,526 | 129,061 | 10,665
Exploration Costs | [1] | 53,519 | 10,055 | 9,631
Development Costs | [2] | 429,151 | 553,469 | 528,684
Asset Retirement Costs |  | 46,017 | 8,363 | 9,768
Total Property Acquisition Costs |  | 565,282 | 734,138 | 561,239
Capitalized interest included in exploration costs |  | 100 | 0 | 0
Capitalized interest included in development costs |  | $ 700 | $ 100 | $ 600
[1] | Amounts for 2024, 2023 and 2022 include capitalized interest of $0.1 million, zero and zero respectively.
[2] | Amounts for 2024, 2023 and 2022 include capitalized interest of $0.7 million, $0.1 million and $0.6 million, respectively.

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- Definition Amount of acquisition cost incurred for property with proved and unproved reserves in oil- and gas-producing activities. Includes capitalized cost and cost charged to expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-20 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-20 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-19 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-18 + Details
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- Definition Amount of acquisition cost incurred for property with unproved reserve in oil- and gas-producing activities. Includes capitalized cost and cost charged to expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477916/932-235-55-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-19 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-17 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-18 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-20 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-20 + Details
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