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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, 2015 $ / bbl $ / MMBtu	Jun. 30, 2014 $ / bbl $ / MMBtu	Jun. 30, 2013 $ / 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	71.88	100.37	91.51
Gas (per million BTU)
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Commodity Prices Used in Determining Future Cash Flows	3.44	4.10	3.44

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