Supplementary Information For Oil And Gas Producing Activities (Costs Incurred In Oil And Gas Property Acquisition, Exploration And Development Activities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Supplementary Information For Oil And Gas Producing Activities Unaudited [Abstract]
Proved		$ 2,491	$ 1,801	$ 245,976
Unproved		10,665	5,102	42,922
Exploration Costs	[1]	9,631	15,413	3,891
Development Costs	[2]	528,684	329,368	355,742
Asset Retirement Costs		9,768	20,194	62,080
Total Property Acquisition Costs		561,239	371,878	710,611
Capitalized interest included in exploration costs		0	100	0
Capitalized interest included in development costs		$ 600	$ 400	$ 1,000

[1] Amounts for 2022, 2021 and 2020 include capitalized interest of zero, $0.1 million and zero respectively.

[2] Amounts for 2022, 2021 and 2020 include capitalized interest of $0.6 million, $0.4 million and $1.0 million, respectively.