Derivatives - Crude Oil Derivative Positions (Details)	3 Months Ended
Sep. 30, 2022 MMBTU $ / MMBTU $ / bbl bbl
October 2022
Derivative [Line Items]
Volume in MMBTU \| MMBTU	117,523
Weighted Average Floor Price	3.75
Weighted Average Ceiling Price	5.05
October 2022
Derivative [Line Items]
Volume in MMBTU \| MMBTU	78,928
Weighted Average Floor Price	5.25
Weighted Average Ceiling Price	6.67
November 2022 - February 2023
Derivative [Line Items]
Volume in MMBTU \| MMBTU	443,750
Weighted Average Floor Price	3.75
Weighted Average Ceiling Price	7.30
November 2022 - March 2023
Derivative [Line Items]
Volume in MMBTU \| MMBTU	374,072
Weighted Average Floor Price	5.25
Weighted Average Ceiling Price	7.50
October 2022 To February 2023
Derivative [Line Items]
Volumes in Barrels \| bbl	76,425
Weighted Average Floor Price \| $ / bbl	70.00
Weighted Average Ceiling Price \| $ / bbl	87.50

- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_NaturalGasCollarOctober2022Member
Namespace Prefix:
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_NaturalGasCollarSecondOctober2022Member
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_NaturalGasCollarNovember2022ToFebruary2023Member
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_NaturalGasCollarNovember2022ToMarch2023Member
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_CrudeOilCollarOctober2022ToFebruary2023Member
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