Supplementary Information On Natural Gas, Oil And NGL Reserves (Narrative) (Details)	12 Months Ended
	Sep. 30, 2022 Bcfe $ / bbl $ / Mcf	Sep. 30, 2022 Mcfe $ / bbl $ / Mcf	Sep. 30, 2022 $ / bbl $ / Mcf	Sep. 30, 2021 Bcfe $ / bbl $ / Mcf	Sep. 30, 2020 Bcfe $ / Mcf $ / bbl
Supplementary Oil And Gas Disclosures [Line Items]
Positive pricing revisions	8.1
Negative revisions	3.3
Reserve extensions, discoveries and other additions	4.9
Proved developed reserve	1.7
Proved undeveloped reserve	3.2
Production of oil and natural gas properties	9.6			9.1	8.6
Net PUD reserves increased	7.7
Proved undeveloped reserves transferred to proved developed	4.1	4,132,227
Percentage transferred to proved developed			79.00%
Remaining revisions of proved undeveloped reserves	11.8
Revisions percentage of proved undeveloped reserves			225.00%
Oklahoma [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Proved developed sale	17.6
Texas, Louisiana and Oklahoma [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Additional proved undeveloped acquisition	8.6
Texas, Louisiana, Oklahoma and North Dakota [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Proved undeveloped reserves, additions	3.2
Oil [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Price used to calculate reserves and future cash flows from reserves | $ / bbl	90.33	90.33	90.33	56.51	40.18
NGL [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Price used to calculate reserves and future cash flows from reserves | $ / bbl	38.09	38.09	38.09	20.58	9.95
Natural Gas [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Price used to calculate reserves and future cash flows from reserves | $ / Mcf	6.41	6.41	6.41	2.79	1.62
Oil, NGL And Natural Gas [Member] | East Texas, Western Louisiana, Mississippi Woodford and Oklahoma [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Acquisition	15.6
Proved developed acquisition	7.0
Proved undeveloped acquisition	8.6