2.4.0.84041 - Disclosure - Property and Equipment (Details 2)truefalsefalse1false USDfalsefalse$D2013http://www.sec.gov/CIK0001006655duration2012-07-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$D2012http://www.sec.gov/CIK0001006655duration2011-07-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 2us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Costs excluded from amortization during the period2false 3epm_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationAcquisitionAndOtherPeriodCostepm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse243593243593USD$falsetruefalse2truefalsefalse38691113869111USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property. It also includes other capitalized costs not otherwise disclosed separately.No definition available.false2Leasehold acquisition costs and other3true 2us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulativeAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Costs excluded from amortization at the end of period4false 3epm_OilAndNaturalGasPropertiesExcludedFromAmortizationAcquisitionAndOtherCostsepm_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse41127044112704USD$falsetruefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to purchase, lease or otherwise acquire an unproved property. It also includes other capitalized costs not otherwise disclosed separately.No definition available.false2Leasehold acquisition costs and otherfalseProperty and Equipment (Details 2) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.evolutionpetroleum.com/role/DisclosurePropertyAndEquipmentDetails224