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Represents the capacity of plant facility on a twelve month rolling sum basis.

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Maximum amount of production permitted on a twelve month rolling sum basis.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) gal in Millions	12 Months Ended
	Oct. 31, 2017 USD ($) gal	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)
Other Intangibles
Economic useful life of other intangibles	15 years
Amortization of Intangible Assets \| $	$ 38,000	$ 38,000	$ 38,000
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Plant production capacity	60.0
Production volume permitted	70.0
Heron Lake BioEnergy, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Plant production capacity	60.0
Production volume permitted	72.3
Heron Lake BioEnergy, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.30%
Heron Lake BioEnergy, LLC \| Project Viking, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership percentage	50.70%
Project Viking, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership percentage	100.00%
Agrinatural, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	27.00%
Agrinatural, LLC \| HLBE Pipeline Company, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership percentage	73.00%