Commitments, Contingencies and Concentrations (Forward Contract) (Details) lb in Thousands, gal in Thousands, bu in Thousands, MMBTU in Thousands	Oct. 31, 2019 bu gal T lb MMBTU $ / lb $ / T $ / gal $ / bu $ / MMBTU
Dried Distillers Grains Sales
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount	8,800
Modified Distillers Grains Sales
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount	29,600
Corn oil
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | lb	1,056
Corn contracts
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | bu	643
Natural gas contracts
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | MMBTU	2,968
Denaturant
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | gal	101
Basis Contracts | Corn contracts
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | bu	190
Priced Contracts | Dried Distillers Grains Sales
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount	8,800
Derivative, average forward price | $ / T	133.70
Priced Contracts | Modified Distillers Grains Sales
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount	29,600
Derivative, average forward price | $ / T	75.22
Priced Contracts | Corn oil
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | lb	1,056
Derivative, average forward price | $ / lb	0.24
Priced Contracts | Corn contracts
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | bu	453
Derivative, average forward price | $ / bu	3.81
Priced Contracts | Natural gas contracts
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | MMBTU	2,968
Derivative, average forward price | $ / MMBTU	2.53
Priced Contracts | Denaturant
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | gal	101
Derivative, average forward price | $ / gal	1.35
Index contracts | Dried Distillers Grains Sales
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount	0
Index contracts | Modified Distillers Grains Sales
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount	0
Index contracts | Corn oil
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | lb	0
Index contracts | Natural gas contracts
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | MMBTU	0
Index contracts | Denaturant
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, nonmonetary notional amount | gal	0