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Supplemental Information on Oil and Natural Gas Operations (Unaudited) - Narrative (Details) | 12 Months Ended
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Sep. 30, 2021 MBoe $ / Mcf $ / bbl $ / MMBTU | Sep. 30, 2020 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 |  | 43.63
Gas, average henry hub spot price (USD per mmbtu) | $ / MMBTU |  | 1.97
Revisions | 4,772 | 1,163
Extensions and discoveries | 13,759 | 3,412
Result of drilling successful wells that were previously classified as unproved locations | 6,564 | 1,404
Result of drilling successful wells offsetting locations that were previously unproven locations | 7,195 | 2,008
Revision of previous estimate, period increase due to pricing and differentials |  | 1,840
Revision of previous estimate, period decrease due to lease operating expenses |  | 1,952
Revision of previous estimate, period increase due to result of better well performance that exceeded previous estimates |  | 1,275
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 | 57.64 |
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 | 2.94 |
Oil |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |
Percentage of reserves | 64.10% | 65.40%
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] |  |
Percentage of reserves | 17.60% | 15.80%
Price (USD per bbl/mcf) | $ / Mcf | 0.99 | (0.06)
NGLs |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |
Percentage of reserves | 18.30% | 18.80%
Price (USD per bbl/mcf) | $ / bbl | 9.83 | (1.96)

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