Summary of Significant Accounting Policies Narrative (Details)	3 Months Ended	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2013 gal
Equity Method Investment, Ownership Percentage	60.80%	60.80%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	39.20%	39.20%
Granite Falls Energy [Member]
Plant production capacity		60,000,000
Production (Actual)		70,000,000
Measurement, Rolling Twelve Months	12
Heron Lake Bioenergy [Member]
Plant production capacity		55,000,000
Heron Lake Bioenergy [Member] | Maximum [Member]
Plant production capacity		59,200,000