Supplemental Oil and Gas Information (Unaudited) - Proved Oil and Gas Quantities (Details) - $ / bbl	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Oil
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Average sales prices (in usd per bbl)	34.11	58.93

The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph (b)
-Subparagraph (1)

Name:	us-gaap_AverageSalesPrices
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration