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Leases - Additional Information (Details)	3 Months Ended
	Sep. 30, 2019 contract
Leases [Abstract]
Number of operating lease contracts	1
Number of finance lease contracts	0
Number of short-term lease contracts	0

X

- Definition

Lessee, Finance Lease, Number Of Contracts

+ References

No definition available.

+ Details

Name:	epm_LesseeFinanceLeaseNumberOfContracts
Namespace Prefix:	epm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee, Operating Lease, Number Of Contracts

+ References

No definition available.

+ Details

Name:	epm_LesseeOperatingLeaseNumberOfContracts
Namespace Prefix:	epm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee, Short-Term Lease, Number Of Contracts

+ References

No definition available.

+ Details

Name:	epm_LesseeShortTermLeaseNumberOfContracts
Namespace Prefix:	epm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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