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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) (Details 2)
 12 Months Ended
Jun. 30, 2013
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Boe
Jun. 30, 2012
Boe
Jun. 30, 2011
Boe
Jun. 30, 2010
Boe
Estimated Net Quantities of Proved Oil and Natural Gas Reserves        
Period on the basis of which reserve volumes and values are determined 12 months      
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in BOE) 13,441,116 13,847,462 12,418,256  
Revisions of previous estimates (in BOE) 2,806,181 (344,440) 1,937,405  
Improved recovery, extensions and discoveries (in BOE)   146,249 129,926  
Sales of minerals in place (in BOE) (2,254,038)   (521,688)  
Production (sales volumes) (in BOE) (226,819) (208,155) (116,437)  
Balance at the end of the period (in BOE) 13,766,440 13,441,116 13,847,462  
Proved developed reserves (in BOE) 10,089,861 8,032,809 5,344,471 1,119,498
Increase (decrease) in proved reserves (in BOE) 300,000 (400,000) 1,400,000  
Number of reservoirs 1      
Proved developed reserves (as a percent) 73.00% 60.00%    
Improvement percentage of proved developed reserves 13.00%      
Giddings Field
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in BOE)   369,000    
Sales of minerals in place (in BOE) (2,254,000)   (521,688)  
Production (sales volumes) (in BOE) (227,000)      
Delhi Field
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in BOE) 2,806,000 210,000    
Increase (decrease) in proved reserves (in BOE) 2,806,000      
Woodford properties in Oklahoma
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in BOE)   127,000    
Giddings Field in South Texas
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Improved recovery, extensions and discoveries (in BOE)   146,000    
Crude Oil
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf) 11,638,618 11,567,846 10,254,470  
Revisions of previous estimates (in Bbls/Mcf) 1,826,053 84,219 1,475,918  
Improved recovery, extensions and discoveries (in Bbls/Mcf)   137,634    
Sales of minerals in place (in Bbls/Mcf) (485,536)   (104,577)  
Production (sales volumes) (in Bbls/Mcf) (196,380) (151,081) (57,965)  
Balance at the end of the period (in Bbls/Mcf) 12,782,755 11,638,618 11,567,846  
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Proved developed reserves (in Bbls/Mcf) 10,077,522 7,670,934 4,986,337 706,053
Period of acceleration in projected reversion date of working interest resulting in upward revision of proved oil reserves 2 years      
Working interest in proved oil reserves (as a percent) 24.00%      
Natural Gas Liquids
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf) 492,473 712,300 1,036,627  
Revisions of previous estimates (in Bbls/Mcf) 975,515 (212,677) (84,154)  
Improved recovery, extensions and discoveries (in Bbls/Mcf)   5,461    
Sales of minerals in place (in Bbls/Mcf) (480,832)   (221,469)  
Production (sales volumes) (in Bbls/Mcf) (7,271) (12,611) (18,704)  
Balance at the end of the period (in Bbls/Mcf) 979,885 492,473 712,300  
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Proved developed reserves (in Bbls/Mcf) 8,539 111,978 100,900 157,302
Natural Gas
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf) 7,860,156 9,403,899 6,762,954  
Revisions of previous estimates (in Bbls/Mcf) 27,679 (1,295,893) 3,273,846  
Improved recovery, extensions and discoveries (in Bbls/Mcf)   18,925 779,556  
Sales of minerals in place (in Bbls/Mcf) (7,726,032)   (1,173,850)  
Production (sales volumes) (in Bbls/Mcf) (139,006) (266,775) (238,607)  
Balance at the end of the period (in Bbls/Mcf) 22,797 7,860,156 9,403,899  
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Proved developed reserves (in Bbls/Mcf) 22,797 1,499,382 1,543,401 1,536,858