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COMMON STOCK (Details) (USD $) | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
COMMON STOCK (Details) [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 283,979 us-gaap_TreasuryStockSharesAcquired | 137,015 us-gaap_TreasuryStockSharesAcquired | 278,369 us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Value, Acquired, Cost Method (in Dollars) | $ 18,238,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 3,486,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 5,445,000 us-gaap_TreasuryStockValueAcquiredCostMethod
Stock Repurchase Program Number of Additional Shares Authorized to be Repurchased | 497,582 rex_StockRepurchaseProgramNumberOfAdditionalSharesAuthorizedToBeRepurchased |  |
Employee Stock Option [Member] |  |  |
COMMON STOCK (Details) [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 1,555 us-gaap_TreasuryStockSharesAcquired / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 32,935 us-gaap_TreasuryStockSharesAcquired / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Treasury Stock, Value, Acquired, Cost Method (in Dollars) | $ 100,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 1,071,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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- Definition Stock repurchase program number of additional shares authorized to be repurchased. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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