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Segment Reporting (Tables)
 6 Months Ended
Jul. 31, 2018
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following table summarizes segment and other results and assets (amounts in thousands):

   Three Months Ended   Six Months Ended 
   July 31,   July 31, 
   2018   2017   2018   2017 
Net sales and revenue:                    
Ethanol and by-products  $128,491   $108,744   $249,171   $221,887 
Refined coal 1   266    —    406    — 
Total net sales and revenue  $128,757   $108,744   $249,577   $221,887 
Segment gross profit (loss):                    
Ethanol and by-products  $13,669   $10,781   $27,215   $23,270 
Refined coal   (4,270)   —    (6,965)   — 
Total gross profit  $9,399   $10,781   $20,250   $23,270 
Income (loss) before income taxes:                    
Ethanol and by-products  $10,077   $7,330   $21,086   $16,253 
Refined coal   (4,788)   —    (7,647)   — 
Corporate and other   (430)   (857)   (931)   (1,778)
Total income (loss) before income taxes  $4,859   $6,473   $12,508   $14,475 
Benefit (provision) for income taxes:                    
Ethanol and by-products  $(2,029)  $(2,675)  $(3,449)  $(5,380)
Refined coal   7,597    —    11,596    — 
Corporate and other   63    373    187    688 
Total benefit (provision) for income taxes  $5,631   $(2,302)  $8,334   $(4,692)
Segment profit (loss):                    
Ethanol and by-products  $6,561   $3,419   $15,150   $8,561 
Refined coal   3,018    —    4,289    — 
Corporate and other   (362)   (478)   (726)   (1,076)
Net income attributable to REX common shareholders  $9,217   $2,941   $18,713   $7,485 
   Three Months Ended
July 31,		   Six Months Ended
July 31,		 
    2018    2017    2018    2017 
Sales of products, ethanol and by-products segment:                    
Ethanol  $100,289   $88,785   $192,182   $180,257 
Dried distillers grains   21,059    13,472    41,143    28,622 
Non-food grade corn oil   5,075    4,726    10,055    9,318 
Modified distillers grains   2,043    1,748    5,760    3,667 
Other   25    13    31    23 
Total  $128,491   $108,744   $249,171   $221,887 
                     
Sales of products, refined coal segment:                    
Refined coal  $266   $—   $406   $— 

1 The Company records sales in the refined coal segment net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.
Assets [Member]  
Segment Reporting (Tables) [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Assets:   July 31,
2018		    January 31,
2018		                 
Ethanol and by-products  $402,728   $384,997                 
Refined coal   10,052    12,165                 
Corporate and other   63,390    81,702                 
Total assets  $476,170   $478,864