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Summary of Significant Accounting Policies - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Sep. 30, 2021
Accounting Policies [Abstract]    
Accrued capital expenditures $ 9,079 $ 9,718
Accrued lease operating expenses 3,207 2,428
Accrued general and administrative costs 3,262 3,575
Other accrued expenditures 3,068 2,834
Total accrued liabilities $ 18,616 $ 18,555