Derivative Instruments Narrative (Details)	3 Months Ended
	Jan. 31, 2016 gal bu
Corn
Derivative [Line Items]
Total notional amount outstanding | bu	3,835,000
Ethanol
Derivative [Line Items]
Total notional amount outstanding | gal	1,680,000
Granite Falls Energy, LLC [Member] | Corn
Derivative [Line Items]
Total notional amount outstanding | bu	880,000
Granite Falls Energy, LLC [Member] | Ethanol
Derivative [Line Items]
Total notional amount outstanding | gal	840,000
Heron Lake Bio-energy LLC [Member] | Corn
Derivative [Line Items]
Total notional amount outstanding | bu	2,955,000
Heron Lake Bio-energy LLC [Member] | Ethanol
Derivative [Line Items]
Total notional amount outstanding | gal	840,000