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LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) - Schedule of Long-term Debt Instruments (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 31, 2014
Debt Instrument [Line Items] |
Maturity | Variable Within five years
Balance (in Dollars) | $ 75,726 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Minimum [Member] |
Debt Instrument [Line Items] |
Interest Rates | 3.24%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |
Debt Instrument [Line Items] |
Interest Rates | 4.00%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Long term variable debt maturity period. + References No definition available. + Details
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Namespace Prefix: | rex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |