Leases (Details) - USD ($)	6 Months Ended
Apr. 30, 2016	Apr. 30, 2015
Granite Falls Energy, LLC [Member] \| Rail Cars [Member]
Operating Leases, Rent Expense	$ 812,000	$ 610,000
Heron Lake Bioenergy [Member]
Operating Leases, Rent Expense	$ 710,000	$ 528,000

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration