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Accounting Policies (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Jan. 31, 2015
USD ($)
Accounting Policies (Details) [Line Items]          
Interest Paid $ 0 $ 518,000 $ 0 $ 1,834,000  
Derivative Settlement on Interest Rate Swap 0 367,000 0 1,142,000  
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value 0 $ 0 0 0  
Liabilities Related to Investment Contracts, Fair Value Disclosure $ 400,000   400,000    
Income Taxes Paid     19,703,000 22,829,000  
Proceeds from Income Tax Refunds     132,000 0  
Inventory Write-down     $ 0   $ 0
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