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INVESTMENTS AND DEPOSITS (Details) - Schedule of Equity Method Investments (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Jan. 31, 2014
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Schedule of Equity Method Investments [Line Items] |  |
Total Equity Method Securities, Carrying Amount | $ 80,389 us-gaap_EquityMethodInvestments | $ 71,189 us-gaap_EquityMethodInvestments
Big River [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Securities, Ownership percentage | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember |
Total Equity Method Securities, Carrying Amount | 40,188 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 40,042 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember
Patriot [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Securities, Ownership percentage | 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember |
Total Equity Method Securities, Carrying Amount | $ 40,201 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | $ 31,147 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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