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Stock-Based Incentive Plan - Contingent Restricted Stock Activity (Details) (USD $) | 3 Months Ended | 9 Months Ended
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Mar. 31, 2015 | Mar. 31, 2015
Contingent Restricted Stock |  |  |  |
Number of Restricted Stock Units |  |  |  |
Unvested at the beginning of the period (in shares) |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember |
Unvested at the end of the period (in shares) | 56,286 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember |  | 56,286 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember |
Weighted Average Grant-Date Fair Value |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  |  | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember |
Unvested at the end of the period (in dollars per share) | $ 8.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember |  | $ 8.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember |
Additional disclosures of restricted stock |  |  |  |
Unrecognized stock compensation expense related to Restricted Stock | $ 62,787 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember | [1] | $ 62,787 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockGrantsMember | [1]
Weighted average remaining service period over which unrecognized compensation cost is expected to be recognized |  |  | 2 years 8 months 12 days |
Contingent Restricted Stock, Performance-Based |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Potential future compensation expense | $ 385,166 epm_SharebasedCompensationArrangementbySharebasedPaymentAwardPotentialFutureAllocatedSharebasedCompensationExpenseNotProbable / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockPerformanceBasedMember |  |  |
Number of Restricted Stock Units |  |  |  |
Granted (in shares) |  |  | 38,325 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockPerformanceBasedMember |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 10.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockPerformanceBasedMember |
Contingent Restricted Stock, Market-Based |  |  |  |
Number of Restricted Stock Units |  |  |  |
Granted (in shares) |  |  | 17,961 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockMarketBasedMember |
Weighted Average Grant-Date Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 4.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = epm_ContingentRestrictedStockMarketBasedMember |
[1] | Excludes $385,166 of potential future compensation expense for performance-based awards for which vesting is not considered probable at this time for accounting purposes.

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Potential Future Allocated Share based Compensation Expense Not Probable + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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