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Summary of Significant Events and Accounting Policies - Concentrations of Credit Risk (Details) - Net revenue - Crude oil, natural gas and natural gas liquids - Major Customers - item | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Concentrations of Credit Risk |  |
Number of operators | 3 | 3
Percent of total revenue | 83.00% | 100.00%

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- Definition For an entity that discloses a concentration risk for threshold percentage. + References No definition available. + Details
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Namespace Prefix: | epm_
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Balance Type: | na
Period Type: | duration

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- Definition Represents the number of operators. + References No definition available. + Details
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Namespace Prefix: | epm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=epm_CrudeOilNaturalGasAndNaturalGasLiquidsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |