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Segment Reporting (Tables) | 12 Months Ended
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Jan. 31, 2020
Segment Reporting (Tables) [Line Items] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | The following tables summarize segment and other results and assets (amounts in thousands):
|  | Fiscal Year
|  | 2019 |  | 2018 |  | 2017
Net sales and revenue: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 417,700 |  |  | $ | 485,885 |  |  | $ | 452,153 |
Refined coal 1 |  |  | 334 |  |  |  | 786 |  |  |  | 433 |
Total net sales and revenue |  | $ | 418,034 |  |  | $ | 486,671 |  |  | $ | 452,586 |
Segment gross profit (loss): |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 20,402 |  |  | $ | 43,856 |  |  | $ | 51,509 |
Refined coal |  |  | (7,917 | ) |  |  | (13,641 | ) |  |  | (7,348 | )
Total gross profit |  | $ | 12,485 |  |  | $ | 30,215 |  |  | $ | 44,161 |
(Loss) income before income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 8,469 |  |  | $ | 31,545 |  |  | $ | 38,352 |
Refined coal |  |  | (7,778 | ) |  |  | (15,204 | ) |  |  | (10,021 | )
Corporate and other |  |  | (1,860 | ) |  |  | (1,753 | ) |  |  | (2,938 | )
Total (loss) income before income taxes |  | $ | (1,169 | ) |  | $ | 14,588 |  |  | $ | 25,393 |
Benefit (provision) for income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 1,528 |  |  | $ | (2,343 | ) |  | $ | 3,245 |
Refined coal |  |  | 10,828 |  |  |  | 24,674 |  |  |  | 15,168 |
Corporate and other |  |  | 457 |  |  |  | 591 |  |  |  | 1,106 |
Total benefit for income taxes |  | $ | 12,813 |  |  | $ | 22,922 |  |  | $ | 19,519 |
Segment profit (loss): |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 5,439 |  |  | $ | 23,346 |  |  | $ | 35,880 |
Refined coal |  |  | 3,391 |  |  |  | 10,148 |  |  |  | 5,628 |
Corporate and other |  |  | (1,403 | ) |  |  | (1,849 | ) |  |  | (1,802 | )
Net income attributable to REX common shareholders |  | $ | 7,427 |  |  | $ | 31,645 |  |  | $ | 39,706 |
|  | Fiscal Year
|  | 2019 |  | 2018 |  | 2017
Sales of products, ethanol and by-products segment: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol |  | $ | 321,434 |  |  | $ | 368,319 |  |  | $ | 359,239 |
Dried distillers grains |  |  | 71,755 |  |  |  | 85,417 |  |  |  | 63,120 |
Non-food grade corn oil |  |  | 17,135 |  |  |  | 20,097 |  |  |  | 21,195 |
Modified distillers grains |  |  | 7,240 |  |  |  | 11,950 |  |  |  | 8,525 |
Other |  |  | 136 |  |  |  | 102 |  |  |  | 74 |
Total sales |  | $ | 417,700 |  |  | $ | 485,885 |  |  | $ | 452,153 |
Sales of products, refined coal segment: |  |  |  |  |  |  |  |  |  |  |  |
Refined coal |  | $ | 334 |  |  | $ | 786 |  |  | $ | 433 |
Interest income: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 2,949 |  |  | $ | 2,460 |  |  | $ | 878 |
Refined coal |  |  | — |  |  |  | — |  |  |  | — |
Corporate and other |  |  | 1,171 |  |  |  | 1,054 |  |  |  | 678 |
Total interest income |  | $ | 4,120 |  |  | $ | 3,514 |  |  | $ | 1,556 |
Depreciation expense: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 20,182 |  |  | $ | 22,004 |  |  | $ | 20,037 |
Refined coal |  |  | 2,790 |  |  |  | 2,784 |  |  |  | 1,385 |
Corporate and other |  |  | 35 |  |  |  | 40 |  |  |  | 40 |
Total depreciation expense |  | $ | 23,007 |  |  | $ | 24,828 |  |  | $ | 21,462 |
Equity in income of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 1,392 |  |  | $ | 1,536 |  |  | $ | 3,232 |
Refined coal |  |  | — |  |  |  | — |  |  |  | — |
Corporate and other |  |  | — |  |  |  | — |  |  |  | — |
Total equity in income of unconsolidated affiliates |  | $ | 1,392 |  |  | $ | 1,536 |  |  | $ | 3,232 |
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.
Assets [Member] |
Segment Reporting (Tables) [Line Items] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | January 31,
Assets: |  | 2020 |  | 2019
Ethanol and by-products |  | $ | 408,746 |  |  | $ | 393,691 |
Refined coal |  |  | 6,101 |  |  |  | 8,625 |
Corporate and other |  |  | 85,655 |  |  |  | 69,077 |
Total assets |  | $ | 500,502 |  |  | $ | 471,393 |
Additions to property and equipment: |  |  |  |  |  |  |  |
Ethanol and by-products |  | $ | 3,776 |  |  | $ | 10,697 |
Refined coal |  |  | — |  |  |  | 78 |
Corporate and other |  |  | — |  |  |  | — |
Total additions to property and equipment |  | $ | 3,776 |  |  | $ | 10,775 |

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