Supplementary Information for Exploration and Production Activities - Costs Incurred in Property Acquisition, Exploration and Development Activities (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Property Acquisition Costs:
Proved		$ 17,069	$ 33,190	$ 2,491
Unproved		19,526	129,061	10,665
Exploration Costs	[1]	53,519	10,055	9,631
Development Costs	[2]	429,151	553,469	528,684
Asset Retirement Costs		46,017	8,363	9,768
Total Property Acquisition Costs		565,282	734,138	561,239
Capitalized interest included in exploration costs		100	0	0
Capitalized interest included in development costs		$ 700	$ 100	$ 600

[1] Amounts for 2024, 2023 and 2022 include capitalized interest of $0.1 million, zero and zero  respectively.

[2] Amounts for 2024, 2023 and 2022 include capitalized interest of $0.7 million, $0.1 million and $0.6 million, respectively.