Derivatives - Crude Oil Derivative Positions (Details)	6 Months Ended
Dec. 31, 2022 MMBTU $ / bbl $ / MMBTU bbl
January 2023 - February 2023
Derivative [Line Items]
Volume in MMBTU \| MMBTU	214,931
Weighted Average Floor Price	3.75
Weighted Average Ceiling Price	7.30
January 2023 - March 2023
Derivative [Line Items]
Volume in MMBTU \| MMBTU	220,875
Weighted Average Floor Price	5.25
Weighted Average Ceiling Price	7.50
January 2023 - February 2023
Derivative [Line Items]
Volumes in Barrels \| bbl	29,995
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_NaturalGasCollarJanuary2023ToFebruary2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_NaturalGasCollarJanuary2023ToMarch2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=epm_CrudeOilCollarJanuary2023ToFebruary2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: