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INVESTMENTS (Details)
$ in Thousands, gal in Millions
 12 Months Ended
Jan. 31, 2019
USD ($)
gal
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
INVESTMENTS (Details) [Line Items]      
Income (Loss) from Equity Method Investments $ 1,536 $ 3,232 $ 6,144
Proceeds from Equity Method Investment, Distribution 4,010 6,516 7,018
Equity Method Investments $ 32,075 34,549  
Debt Securities, Held-to-maturity, Maturity, within One Year, Weighted Average Yield 2.29%    
Debt Securities, Held-to-maturity   0  
Big River [Member]      
INVESTMENTS (Details) [Line Items]      
Payments to Acquire Equity Method Investments $ 20,000    
Quantity of ethanol shipped (in US Gallons) | gal 428.6    
Income (Loss) from Equity Method Investments $ 1,500 3,200 6,100
Proceeds from Equity Method Investment, Distribution 4,000 $ 6,500 $ 7,000
Equity Method Investments 32,100    
Equity Method Investment, Underlying Equity in Net Assets 28,300    
Other Restricted Assets 185,100    
Proportionate Share of Restricted Net Assets $ 19,100