Risks and Uncertainties Narrative (Details)	Oct. 31, 2013
Minimum [Member]
Concentration Risk [Line Items]
Sales Revenue, Goods, Net, Percentage	80.00%
Minimum [Member] | Corn Contracts [Member]
Concentration Risk [Line Items]
Percent of Cost of Goods Sold	70.00%
Maximum [Member]
Concentration Risk [Line Items]
Sales Revenue, Goods, Net, Percentage	85.00%
Percent of Cost of Goods Sold	80.00%