Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total Revenues	$ 57,250	$ 23,014
Oil and natural gas sales, net
Disaggregation of Revenue [Line Items]
Total Revenues	56,650	22,414
Oil
Disaggregation of Revenue [Line Items]
Total Revenues	50,623	22,107
Natural Gas
Disaggregation of Revenue [Line Items]
Total Revenues	2,705	119
Natural gas liquids
Disaggregation of Revenue [Line Items]
Total Revenues	$ 3,322	$ 188