Supplementary Information On Natural Gas, Oil And NGL Reserves (Summary of Proved Undeveloped Reserves) (Details) - 12 months ended Sep. 30, 2022	Mcfe	Bcfe
Extractive Industries [Abstract]
Beginning proved undeveloped reserves	5,263,233
Proved undeveloped reserves transferred to proved developed	(4,132,227)	(4.1)
Revisions	63,036
Extensions and discoveries	3,164,434
Purchases	8,603,911
Ending proved undeveloped reserves	12,962,387