XML 100 R84.htm IDEA: XBRL DOCUMENT v3.7.0.1

Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Schedule of NYMEX Prices Used in Determining Future Cash Flows (Details)	12 Months Ended
	Jun. 30, 2017 $ / bbl $ / MMBtu	Jun. 30, 2016 $ / bbl $ / MMBtu	Jun. 30, 2015 $ / bbl $ / MMBtu
Oil (per barrel)
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Commodity Prices Used in Determining Future Cash Flows | $ / bbl	48.85	42.91	71.88
Gas (per million BTU)
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Commodity Prices Used in Determining Future Cash Flows | $ / MMBtu	0	0	3.44

X

- Definition

Represents the unweighted arithmetic average first-day-of-the-month commodity prices used in determining future cash flows.

+ References

No definition available.

+ Details

Name:	epm_CommodityPricesUsedInDeterminingFutureCashFlows
Namespace Prefix:	epm_
Data Type:	us-types:perUnitItemType
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_AverageSalesPriceAndProductionCostsPerUnitOfProductionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis=epm_OilPerBarrelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis=epm_GasPerMillionsOfBTUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: