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Supplemental Information On Natural Gas and Oil Exploration, Development and Production Activities (Narrative) (Details) (USD $) | 12 Months Ended
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Oct. 31, 2012
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities 1 | 10.00%
Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities 2 | $ 111.61

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