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Segment Reporting
 12 Months Ended
Jan. 31, 2019
Segment Reporting [Abstract]  
Segment Reporting Disclosure [Text Block]
16.SEGMENT REPORTING

In the third quarter of fiscal year 2017, the Company began reporting the results of its refined coal operations as a new segment as a result of the refined coal acquisition (see Note 3). The Company has two segments: ethanol and by-products and refined coal. Historical amounts have been reclassified to conform to the current year segment reporting presentation. The Company evaluates the performance of each reportable segment based on net income attributable to REX common shareholders. The following tables summarize segment and other results and assets (amounts in thousands):


   Fiscal Year 
   2018   2017   2016 
                
Net sales and revenue:               
                
Ethanol and by-products  $485,885   $452,153   $453,799 
Refined coal 1   786    433    — 
Total net sales and revenue  $486,671   $452,586   $453,799 
                
Segment gross profit (loss):               
                
Ethanol and by-products  $43,856   $51,509   $71,039 
Refined coal   (13,641)   (7,348)   — 
Total gross profit  $30,215   $44,161   $71,039 
                
Income (loss) before income taxes:               
                
Ethanol and by-products  $31,545   $38,352   $59,447 
Refined coal   (15,204)   (10,021)   — 
Corporate and other   (1,753)   (2,938)   (2,536)
Total income before income taxes  $14,588   $25,393   $56,911 
                
Benefit (provision) for income taxes:               
                
Ethanol and by-products  $(2,343)  $3,245   $(18,259)
Refined coal   24,674    15,168    — 
Corporate and other   591    1,106    866 
Total benefit (provision) for income taxes  $22,922   $19,519   $(17,393)
                
Segment profit (loss):               
                
Ethanol and by-products  $23,346   $35,880   $33,950 
Refined coal   10,148    5,628    — 
Corporate and other   (1,849)   (1,802)   (1,617)
Net income attributable to REX common shareholders  $31,645   $39,706   $32,333 

1 Sales in the refined coal segment are recorded net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.


   Fiscal Year 
   2018   2017   2016 
             
Sales of products, ethanol and by-products segment:               
                
Ethanol  $368,319   $359,239   $358,349 
Dried distillers grains   85,417    63,120    71,204 
Non-food grade corn oil   20,097    21,195    18,518 
Modified distillers grains   11,950    8,525    5,326 
Other   102    74    402 
Total sales  $485,885   $452,153   $453,799 
                
Sales of products, refined coal segment:               
                
Refined coal  $786   $433   $— 
                
Interest income:               
                
Ethanol and by-products  $2,460   $878   $212 
Refined coal   —    —    — 
Corporate and other   1,054    678    222 
Total interest income  $3,514   $1,556   $434 
                
Depreciation expense:               
                
Ethanol and by-products  $22,004   $20,037   $19,464 
Refined coal   2,784    1,385    — 
Corporate and other   40    40    55 
Total depreciation expense  $24,828   $21,462   $19,519 
                
Equity in income of unconsolidated affiliates:               
                
Ethanol and by-products  $1,536   $3,232   $6,144 
Refined coal   —    —    — 
Corporate and other   —    —    — 
Total equity in income of unconsolidated affiliates  $1,536   $3,232   $6,144 
                
(Loss) gain on sale of investment:               
                
Ethanol and by-products  $—   $(13)  $192 
Refined coal   —    —    — 
Corporate and other   —    —    — 
Total gain on sale of investment  $—   $(13)  $192 

   January 31, 
Assets:  2019   2018 
           
Ethanol and by-products  $393,691   $384,997 
Refined coal   8,625    12,165 
Corporate and other   69,077    81,702 
Total assets  $471,393   $478,864 
           
Additions to other long lived assets:          
           
Ethanol and by-products  $—   $796 
Refined coal   —    — 
Corporate and other   —    — 
Total additions to other long lived assets  $—   $796 
           
Additions to property and equipment:          
           
Ethanol and by-products  $10,697   $24,017 
Refined coal   78    — 
Corporate and other   —    — 
Total additions to property and equipment  $10,775   $24,017 

All of the Company’s ethanol and distillers grains are sold in the domestic market. The Company’s customers make all decisions with regard to where products they purchase from the Company are distributed.