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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, 2019
$ / bbl
$ / MMBtu
Jun. 30, 2018
$ / 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 61.62 57.50
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