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Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities (Details)
 12 Months Ended
Oct. 31, 2012
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 1 155.79
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 3 155.79
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 4 5.78
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 6 5.78
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 7 (22.53)
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 9 (22.53)
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 10 139.04
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 12 139.04
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 13 68.07
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 15 68.07
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 16 56.14
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities 18 56.14