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Supplemental Information on Oil and Natural Gas Operations (Unaudited) - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2021 MBoe $ / bbl $ / MMBTU $ / Mcf	Sep. 30, 2021 MBoe $ / bbl $ / Mcf $ / MMBTU
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Oil and natural gas liquids, average WTI intermediate spot price (USD per bbl) | $ / bbl		57.64
Gas, average henry hub spot price (USD per mmbtu) | $ / MMBTU		2.94
Revisions | MBoe	133	4,772
Extensions and discoveries | MBoe	2,026	13,759
Result of drilling successful wells that were previously classified as unproved locations | MBoe		6,564
Result of drilling successful wells offsetting locations that were previously unproven locations | MBoe		7,195
West Texas Intermediate (WTI)
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Oil and natural gas liquids, average WTI intermediate spot price (USD per bbl) | $ / bbl	66.55
Henry Hub
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Gas, average henry hub spot price (USD per mmbtu) | $ / MMBTU	3.60
Oil
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Percentage of reserves	64.10%	64.10%
Price (USD per bbl/mcf) | $ / bbl	64.60	55.73
Natural Gas
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Percentage of reserves	17.60%	17.60%
Price (USD per bbl/mcf) | $ / Mcf	1.65	0.99
NGLs
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Percentage of reserves	18.30%	18.30%
Price (USD per bbl/mcf) | $ / bbl	13.75	9.83

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Proved Developed and Undeveloped Reserve, Result of Drilling Successful Wells Offsetting Locations that were Previously Unproven Locations (Energy)

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Proved Developed and Undeveloped Reserve, Result of Drilling Successful Wells that were Previously Classified as Unproved Locations (energy)

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Sales price per unit of oil and gas produced.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
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Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
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