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LEASES (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
Number of Owned Properties Subject to Operating Lease | 6 |  |
Operating Leases, Income Statement, Minimum Lease Revenue | $ 1,570,000 | $ 1,288,000 | $ 1,000,000

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- Definition Number of owned properties subject to operating lease. + References No definition available. + Details
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Namespace Prefix: | rex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 19 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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