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Summary of Significant Accounting Policies Narrative (Details)
 3 Months Ended 12 Months Ended
Oct. 31, 2014
Oct. 31, 2014
gal
Heron Lake Bioenergy [Member]    
Equity Method Investment, Ownership Percentage 50.60%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= gfe_HeronLakeBioenergyMember		 50.60%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= gfe_HeronLakeBioenergyMember
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 49.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= gfe_HeronLakeBioenergyMember		 49.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= gfe_HeronLakeBioenergyMember
Plant production capacity   55,000,000gfe_PlantProductionCapacity
/ dei_LegalEntityAxis
= gfe_HeronLakeBioenergyMember
Heron Lake Bioenergy [Member] | Maximum [Member]    
Plant production capacity   59,200,000gfe_PlantProductionCapacity
/ dei_LegalEntityAxis
= gfe_HeronLakeBioenergyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Agrinatural, LLC [Member]    
Equity Method Investment, Ownership Percentage 73.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= gfe_AgrinaturalLLCMember		 73.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= gfe_AgrinaturalLLCMember
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 27.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= gfe_AgrinaturalLLCMember		 27.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= gfe_AgrinaturalLLCMember
Granite Falls Energy [Member]    
Plant production capacity   60,000,000gfe_PlantProductionCapacity
/ dei_LegalEntityAxis
= gfe_GraniteFallsEnergyMember
Production (Actual)   70,000,000gfe_ProductionActual
/ dei_LegalEntityAxis
= gfe_GraniteFallsEnergyMember
Measurement, Rolling Twelve Months twelve