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Oil and Natural Gas Properties - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Extractive Industries [Abstract] |  |  |  |
Depletion and amortization | $ 6.7 | $ 4.8 | $ 18.7 | $ 15.5

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- References No definition available. + Details
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