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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
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Gas (per million BTU) |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Commodity Prices Used in Determining Future Cash Flows | 4.10 | 3.44 | 3.15
Oil (per barrel) |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Commodity Prices Used in Determining Future Cash Flows | 100.37 | 91.51 | 95.67

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