Discontinued Operations and Disposal Groups - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Apr. 02, 2021	Mar. 10, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before income taxes	$ 0	$ (18,631)	$ 0	$ (18,631)
Income tax benefit	0	25	0	25
Loss on Discontinued Operations	$ 0	(18,606)	$ 0	$ (18,606)
Kansas Properties | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration from discontinued operations					$ 3,300	$ 3,500
Consideration from discontinued operations including closing adjustments					$ 3,300
Total revenues		0
Lease operating expenses		115
Goodwill impairment		18,516
Total expenses		18,631
Loss from discontinued operations before income taxes		(18,631)
Income tax benefit		25
Loss on Discontinued Operations		(18,606)
Kansas Properties | Discontinued Operations, Disposed of by Sale | Oil and natural gas sales, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		$ 0