Credit facility, number of rights to interim unscheduled redeterminations

No definition available.

Name:	epm_CreditFacilityNumberOfRightsToInterimUnscheduledRedeterminations
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Covenant, Maximum Total Leverage Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Minimum Current Ratio

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Percent Of Instrument Hedged.

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Percent Of Instrument Hedged.

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Variable Interest Rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	epm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Compliance, Margined Collateral Value.

+ References

No definition available.

+ Details

Name:	epm_LineOfCreditFacilityCovenantComplianceMarginedCollateralValue
Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Compliance, Minimum Consolidated Tangible Net Worth

+ References

No definition available.

+ Details

Name:	epm_LineofCreditFacilityCovenantComplianceMinimumConsolidatedTangibleNetWorth
Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Initial Borrowing Base

+ References

No definition available.

+ Details

Name:	epm_LineofCreditFacilityInitialBorrowingBase
Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of borrowing base to Margined Collateral Value

+ References

No definition available.

+ Details

Name:	epm_PercentageOfBorrowingBaseToMarginedCollateralValue
Namespace Prefix:	epm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage Of Production Hedged.

+ References

No definition available.

+ Details

Name:	epm_PercentageOfProductionHedged
Namespace Prefix:	epm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=epm_SeniorSecuredReserveBasedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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Data Type:	na
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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
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Senior Secured Credit Facility (Details) $ in Millions		3 Months Ended
Senior Secured Credit Facility (Details) $ in Millions	Apr. 11, 2016 USD ($)	Sep. 30, 2022 USD ($) agreement	Oct. 01, 2022 USD ($)	Feb. 07, 2022	Nov. 09, 2021 USD ($)	Sep. 30, 2021	Aug. 05, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jan. 05, 2021
Debt Instrument [Line Items]
Minimum current ratio	1.00
Percentage of production hedged				25.00%
LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument, variable interest rate	0.25%
Line of Credit \| Senior Secured Reserve-Based Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate		4.89%				3.00%
Line of Credit \| Senior Secured Reserve-Based Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Term of debt instrument	3 years
Maximum borrowing capacity	$ 50.0
Available borrowing capacity		$ 37.8
Initial borrowing base					$ 50.0
Credit facility maturity date		Apr. 09, 2024
Credit facility, number of rights to interim unscheduled redeterminations \| agreement		1
Minimum current ratio									1.00
Minimum consolidated tangible net worth	$ 40.0						$ 40.0	$ 50.0
Long-term line of credit		$ 12.3
Commitment fee percentage	0.25%
Maximum total leverage ratio (not more than)	3.00
Current borrowing base		$ 50.0
Debt instrument, covenant, percent of borrowings base utilized					25.00%
Line of Credit \| Senior Secured Reserve-Based Credit Facility \| Revolving credit facility \| Minimum
Debt Instrument [Line Items]
Percent of instrument hedged					25.00%
Line of Credit \| Senior Secured Reserve-Based Credit Facility \| Revolving credit facility \| Maximum
Debt Instrument [Line Items]
Percent of instrument hedged					75.00%
Line of Credit \| Senior Secured Reserve-Based Credit Facility \| Revolving credit facility \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 50.0
Margined collateral value			$ 130.0
Percentage of borrowing base to Margined Collateral Value			25.00%
Line of Credit \| Senior Secured Reserve-Based Credit Facility \| LIBOR \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
Line of Credit \| Senior Secured Reserve-Based Credit Facility \| Prime Rate \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%