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INCOME TAXES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
INCOME TAXES (Details) [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 4,015,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | $ 19,751,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  |
Income to be Generated for Utilization of Alternative Minimum Tax Credit Carryforwards | 27,000,000 rex_IncomeToBeGeneratedForUtilizationOfAlternativeMinimumTaxCreditCarryforwards |  |  |
Deferred Tax Assets, Valuation Allowance | 1,752,000 us-gaap_DeferredTaxAssetsValuationAllowance | 2,017,000 us-gaap_DeferredTaxAssetsValuationAllowance | 1,891,000 us-gaap_DeferredTaxAssetsValuationAllowance | 1,676,000 us-gaap_DeferredTaxAssetsValuationAllowance
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (265,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 126,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 215,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Income Taxes Paid | 30,142,000 us-gaap_IncomeTaxesPaid | 3,450,000 us-gaap_IncomeTaxesPaid | 51,000 us-gaap_IncomeTaxesPaid |
Proceeds from Income Tax Refunds | 53,000 us-gaap_ProceedsFromIncomeTaxRefunds | 38,000 us-gaap_ProceedsFromIncomeTaxRefunds | 1,005,000 us-gaap_ProceedsFromIncomeTaxRefunds |
Unrecognized Tax Benefit | 1,191,000 rex_UnrecognizedTaxBenefit |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 467,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |
State and Local Jurisdiction [Member] |  |  |  |
INCOME TAXES (Details) [Line Items] |  |  |  |
Operating Loss Carryforwards | $ 18,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |

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- Definition Income to be generated for utilization of alternative minimum tax credit carryforwards. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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