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Other Assets - Additional Information (Details) - Well Lift Inc.	12 Months Ended
	Jun. 30, 2018
Line of Credit Facility [Line Items]
Perpetual royalty percentage	5.00%
Ownership percentage	17.50%

X

- Definition

Perpetual Royalty Revenue, Percentage

+ References

No definition available.

+ Details

Name:	epm_PerpetualRoyaltyRevenuePercentage
Namespace Prefix:	epm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_OwnershipAxis=epm_WellLiftInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: