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Supplemental Information on Oil and Natural Gas Operations (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil, Natural Gas and NGL Reserves (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
$ / bbl
Dec. 31, 2021
USD ($)
$ / Mcf
Dec. 31, 2022
USD ($)
$ / Mcf
$ / bbl
Sep. 30, 2021
USD ($)
$ / bbl
Sep. 30, 2021
USD ($)
$ / Mcf
Sep. 30, 2020
USD ($)
Extractive Industries [Abstract]            
Future crude oil, natural gas and NGLs sales $ 3,350,506 $ 3,350,506 $ 5,135,650 $ 2,783,910 $ 2,783,910  
Future production costs (912,468) (912,468) (1,559,266) (839,167) (839,167)  
Future development costs (216,138) (216,138) (341,481) (218,765) (218,765)  
Future income tax expense (436,829) (436,829) (658,340) (324,487) (324,487)  
Future net cash flows 1,785,071 1,785,071 2,576,563 1,401,491 1,401,491  
10% annual discount (1,081,602) (1,081,602) (1,468,187) (848,555) (848,555)  
Standardized measure of discounted future net cash flows $ 703,469 $ 703,469 $ 1,108,376 $ 552,936 $ 552,936 $ 302,338
Oil            
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]            
Price (USD per bbl/mcf) | $ / bbl 64.60   91.96 55.73    
Natural Gas            
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]            
Price (USD per bbl/mcf) 1.65 1.65 3.16 0.99 0.99  
NGLs            
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]            
Price (USD per bbl/mcf) 13.75 13.75 25.55 9.83 9.83