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Accounting Policies (Details)
 3 Months Ended 6 Months Ended
Jan. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Accounting Policies (Details) [Line Items]      
Income Taxes Paid   $ 1,010,000 $ 19,680,000
Proceeds from Income Tax Refunds   0 100,000
Unrecognized Tax Benefits $ 987,000 987,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0 171,000  
Inventory Write-down $ 0 $ 0  
Property, Plant and Equipment, Depreciation Methods   Depreciation iscomputed using the straight-line method.  
Impairment of Real Estate   $ 0 $ 125,000
Number of Ethanol Entities Under Majority Ownership Interest   2  
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   2 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  
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%