Registration of securities issued in business combination transactions

Supplemental Oil and Gas Information (Unaudited) - Proved Oil and Gas Quantities (Detail)

v3.6.0.2
Supplemental Oil and Gas Information (Unaudited) - Proved Oil and Gas Quantities (Detail) - $ / 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