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v3.21.2

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Fair Value Disclosures [Abstract] |  |
Fair value of asset retirement obligation liabilities incurred and acquired | $ 0.1 | $ 1.2

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- Definition Asset Retirement Obligation, Liabilities Incurred And Acquired, Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | rep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration