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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 | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) $ / Mcf $ / bbl | Sep. 30, 2020 USD ($) $ / Mcf $ / bbl | Sep. 30, 2019 USD ($)
Extractive Industries [Abstract] |  |  |
Future crude oil, natural gas and NGLs sales | $ 2,783,910 | $ 1,533,286 |
Future production costs | (839,167) | (550,427) |
Future development costs | (218,765) | (144,912) |
Future income tax expense | (324,487) | (3,167) |
Future net cash flows | 1,401,491 | 834,780 |
10% annual discount | (848,555) | (532,442) |
Standardized measure of discounted future net cash flows | 552,936 | 302,338 | $ 442,212
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Net change in prices and production costs | $ 237,475 | $ (162,571) |
Oil |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Price (USD per bbl/mcf) | $ / bbl | 55.73 | 41.91 |
Natural Gas |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Price (USD per bbl/mcf) | $ / Mcf | 0.99 | (0.06) |
NGLs |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Price (USD per bbl/mcf) | $ / bbl | 9.83 | (1.96) |

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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 http://asc.fasb.org/extlink&oid=123377692&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 http://asc.fasb.org/extlink&oid=123377692&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 http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 + Details
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- Definition Amount of estimated future accumulated cash outflow for costs to be incurred in developing 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62455-109447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62479-109447 + Details
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