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v3.19.3

Leases - Additional Information (Details) | 3 Months Ended
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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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration