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INVESTMENTS (Details)
$ in Thousands, gal in Millions
3 Months Ended 12 Months Ended
Jun. 01, 2015
USD ($)
Apr. 30, 2016
USD ($)
Jan. 31, 2018
USD ($)
gal
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Jan. 31, 2009
INVESTMENTS (Details) [Line Items]            
Equity Method Investment, Ownership Percentage 27.00%   10.30% 9.70%    
Income (Loss) from Equity Method Investments     $ 3,232 $ 6,144 $ 8,984  
Proceeds from Equity Method Investment, Distribution     6,516 7,018 11,151  
Equity Method Investments     34,549 37,833    
Gain (Loss) on Sale of Investments     (13) 192 10,385  
Big River [Member]            
INVESTMENTS (Details) [Line Items]            
Payments to Acquire Equity Method Investments     20,000      
Income (Loss) from Equity Method Investments     3,200 6,100 6,000  
Proceeds from Equity Method Investment, Distribution     6,500 7,000 $ 7,500  
Equity Method Investments     34,500      
Equity Method Investment, Underlying Equity in Net Assets     32,200      
Other Restricted Assets     202,600      
Proportionate Share of Restricted Net Assets     $ 20,900      
Big River [Member] | Burlington [Member]            
INVESTMENTS (Details) [Line Items]            
Quantity of ethanol shipped (in US Gallons) | gal     108      
Big River [Member] | Illinois [Member]            
INVESTMENTS (Details) [Line Items]            
Quantity of ethanol shipped (in US Gallons) | gal     126      
Big River [Member] | Dyersville [Member]            
INVESTMENTS (Details) [Line Items]            
Quantity of ethanol shipped (in US Gallons) | gal     130      
Equity Method Investment, Ownership Percentage         55.30% 50.50%
Big River [Member] | Boyceville [Member]            
INVESTMENTS (Details) [Line Items]            
Quantity of ethanol shipped (in US Gallons) | gal     57      
Big River [Member] | Big River Resources United Energy LLC [Member]            
INVESTMENTS (Details) [Line Items]            
Equity Method Investment, Ownership Percentage     55.30%      
Patriot [Member]            
INVESTMENTS (Details) [Line Items]            
Income (Loss) from Equity Method Investments         $ 2,900  
Proceeds from Equity Method Investment, Distribution         $ 3,600  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%          
Gain (Loss) on Disposition of Business $ 45,500          
Business Combination, Consideration Transferred 196,000          
Gain (Loss) on Sale of Investments $ 10,400 $ 200        
Proceeds From Payment For Escrow Holdbacks And Adjustments       $ 4,500