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Segment Reporting (Tables)
 3 Months Ended
Apr. 30, 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 
   April 30, 
   2018   2017 
Net sales and revenue:          
Ethanol and by-products  $120,680   $113,143 
Refined coal 1   140    — 
Total net sales and revenue  $120,820   $113,143 
Segment gross profit (loss):          
Ethanol and by-products  $13,546   $12,489 
Refined coal   (2,695)   — 
Total gross profit  $10,851   $12,489 
           
Income (loss) before income taxes:          
Ethanol and by-products  $11,009   $8,923 
Refined coal   (2,859)   — 
Corporate and other   (501)   (921)
Total income (loss) before income taxes  $7,649   $8,002 
   Three Months Ended
April 30,		 
   2018   2017 
Benefit (provision) for income taxes:        
Ethanol and by-products  $(1,420)  $(2,705)
Refined coal   3,999    — 
Corporate and other   124    315 
Total benefit (provision) for income taxes  $2,703   $(2,390)
           
Segment profit (loss):          
Ethanol and by-products  $8,589   $5,142 
Refined coal   1,271    — 
Corporate and other   (364)   (598)
Net income attributable to REX common shareholders  $9,496   $4,544 
           
      Three Months Ended
April 30,		 
    2018    2017 
Sales of products, ethanol and by-products segment:          
Ethanol  $91,893   $91,472 
Dried distillers grains   20,083    15,149 
Non-food grade corn oil   4,980    4,593 
Modified distillers grains   3,717    1,920 
Other   7    9 
Total  $120,680   $113,143 
           
Sales of products, refined coal segment:          
Refined coal  $140   $— 

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]
    April 30,
2018		    January 31, 2018 
Assets:          
Ethanol and by-products  $397,198   $384,997 
Refined coal   10,820    12,165 
Corporate and other   68,546    81,702 
Total assets  $476,564   $478,864