Supplementary Information For Oil And Gas Producing Activities (Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Supplementary Information For Oil And Gas Producing Activities Unaudited [Abstract]
Future Cash Inflows	$ 19,209,099	$ 10,175,182	$ 6,493,362
Future Production Costs	3,138,226	3,423,629	3,149,857
Future Development Costs	781,847	597,662	501,678
Future Income Tax Expense at Applicable Statutory Rate	3,876,272	1,397,175	454,553
Future Net Cash Flows	11,412,754	4,756,716	2,387,274
10% Annual Discount for Estimated Timing of Cash Flows	5,964,424	2,403,144	1,164,804
Standardized Measure of Discounted Future Net Cash Flows	$ 5,448,330	$ 2,353,572	$ 1,222,470	$ 1,736,319