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Concentrations of Credit Risk (Tables)
 12 Months Ended
Jun. 30, 2013
Concentrations of Credit Risk  
Schedule of customers from whom the entity derived 10 percent or more of net oil and natural gas revenues

  Year Ended June 30,  
Customer
  2013   2012   2011  

Plains Marketing L.P. (includes Delhi production)

     90 %   84 %   60 %

Enterprise Crude Oil LLC

     4 %   7 %   15 %

Flint Hills

     2 %   1 %   — %

DCP Midstream, LP

     1 %   2 %   6 %

Kinder Morgan (fka Copano Field Services/Upper Gulf Coast, L.P. )

     1 %   3 %   7 %

Enervest, LLC

     1 %   — %   — %

Orion Exploration Partners, LLC

     1 %   — %   — %

ETC Texas Pipeline, LTD. 

     — %   3 %   12 %