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Supplemental Information on Oil and Natural Gas Operations (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil, Natural Gas and NGL Reserves (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) $ / bbl | Dec. 31, 2021 USD ($) $ / Mcf | Dec. 31, 2022 USD ($) $ / Mcf $ / bbl | Sep. 30, 2021 USD ($) $ / bbl | Sep. 30, 2021 USD ($) $ / Mcf | Sep. 30, 2020 USD ($)
Extractive Industries [Abstract] |  |  |  |  |  |
Future crude oil, natural gas and NGLs sales | $ 3,350,506 | $ 3,350,506 | $ 5,135,650 | $ 2,783,910 | $ 2,783,910 |
Future production costs | (912,468) | (912,468) | (1,559,266) | (839,167) | (839,167) |
Future development costs | (216,138) | (216,138) | (341,481) | (218,765) | (218,765) |
Future income tax expense | (436,829) | (436,829) | (658,340) | (324,487) | (324,487) |
Future net cash flows | 1,785,071 | 1,785,071 | 2,576,563 | 1,401,491 | 1,401,491 |
10% annual discount | (1,081,602) | (1,081,602) | (1,468,187) | (848,555) | (848,555) |
Standardized measure of discounted future net cash flows | $ 703,469 | $ 703,469 | $ 1,108,376 | $ 552,936 | $ 552,936 | $ 302,338
Oil |  |  |  |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |  |  |  |
Price (USD per bbl/mcf) | $ / bbl | 64.60 |  | 91.96 | 55.73 |  |
Natural Gas |  |  |  |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |  |  |  |
Price (USD per bbl/mcf) | 1.65 | 1.65 | 3.16 | 0.99 | 0.99 |
NGLs |  |  |  |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |  |  |  |
Price (USD per bbl/mcf) | 13.75 | 13.75 | 25.55 | 9.83 | 9.83 |

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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126939881&loc=d3e62455-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=126939881&loc=d3e62479-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 + Details
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