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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified | Aug. 01, 2014
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Subsequent Events [Abstract] |
Accelerated principal payments | $ 17

X
- Definition Accelerated principal payments due in the next twelve months. + References No definition available. + Details
Name: | rex_AcceleratedPrincipalPayments
Namespace Prefix: | rex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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