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Supplemental Information On Natural Gas and Oil Exploration, Development and Production Activities (Narrative) (Details) (USD $)	12 Months Ended
	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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Supplemental Information On Natural Gas And Oil Exploration, Development And Production Activities 1

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