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Income Taxes - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 26, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |
Provision for deferred income taxes | $ 13,600 | $ 12,962 | $ 665
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards |  | 13,700 |
Operating loss carryforwards, subject to expiration |  | 4,900 |
Operating loss carryforwards, not subject to expiration |  | 8,800 |
Riley Exploration |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards, not subject to expiration |  | $ 12,100 |

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