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Summary of Significant Accounting Policies (Details)
12 Months Ended
Jun. 30, 2012
Low end of the range
 
Other Property and Equipment  
Expected lives of the individual assets or group of assets 3 years
High end of the range
 
Other Property and Equipment  
Expected lives of the individual assets or group of assets 7 years
Oil and natural gas properties
 
Limitation on Capitalized Costs  
Discount rate for present value 10.00%
Period considered for computing unweighted arithmetic average of oil and natural gas prices 12 months