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NET SALES AND REVENUE (Details) - Schedule of Sales of Consolidated Ethanol Plants (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 127,651 us-gaap_SalesRevenueNet | [1] | $ 138,424 us-gaap_SalesRevenueNet | [1] | $ 150,231 us-gaap_SalesRevenueNet | [1] | $ 155,924 us-gaap_SalesRevenueNet | [1] | $ 146,073 us-gaap_SalesRevenueNet | [1] | $ 166,167 us-gaap_SalesRevenueNet | [1] | $ 175,385 us-gaap_SalesRevenueNet | [1] | $ 178,420 us-gaap_SalesRevenueNet | [1] | $ 572,230 us-gaap_SalesRevenueNet | $ 666,045 us-gaap_SalesRevenueNet | $ 656,589 us-gaap_SalesRevenueNet
Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452,831 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_EthanolMember | 500,203 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_EthanolMember | 495,249 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_EthanolMember
Dried Distillers Grains [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,328 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember | 125,575 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember | 114,732 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember
Non-Food Grade Corn Oil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,985 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_NonFoodGradeCornOilMember | 18,788 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_NonFoodGradeCornOilMember | 16,037 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_NonFoodGradeCornOilMember
Modified Distillers Grains [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,814 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember | 18,998 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember | 27,463 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember
Other Product [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,272 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_OtherProductMember | $ 2,481 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_OtherProductMember | $ 3,108 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_OtherProductMember
[1] | Amounts differ from those previously reported as a result of retail operations and certain real estate assets sold being reclassified as discontinued operations and other reclassifications.

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