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Accounting Policies (Details)
 3 Months Ended 6 Months Ended
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
Accounting Policies (Details) [Line Items]        
Interest Paid $ 0 $ 496,000 $ 0 $ 1,316,000
Derivative Settlement on Interest Rate Swap 0 $ 376,000 0 774,000
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value 0   0  
Liabilities Associated with Forward Contracts 500,000   500,000  
Income Taxes Paid     19,680,000 18,521,000
Proceeds from Income Tax Refunds     100,000 0
Unrecognized Tax Benefit 317,000   317,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 480,000   480,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 24,000   $ 24,000  
Property, Plant and Equipment, Depreciation Methods     Depreciation is computed using the straight-line method.  
Asset Impairment Charges     $ 125,000,000,000 $ 68,000,000,000
Number of Ethanol Entities Under Majority Ownership Interest 2   2  
Cost of Sales [Member]        
Accounting Policies (Details) [Line Items]        
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting     20.00%  
Minimum [Member] | Building and Building Improvements [Member]        
Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life     15 years  
Minimum [Member] | Fixtures And Equipment [Member]        
Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life     3 years  
Maximum [Member] | Building and Building Improvements [Member]        
Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life     40 years  
Maximum [Member] | Fixtures And Equipment [Member]        
Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life     20 years