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Leases (Details) | Jul. 31, 2014
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Leases [Abstract] |
Number of Owned Properties Subject to Operating Lease | 5

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

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