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Consolidated Condensed Financial Statements (Details)	3 Months Ended
	Apr. 30, 2015
Disclosure Text Block [Abstract]
Number of Reportable Segments	1us-gaap_NumberOfReportableSegments
Number of Ethanol Entities Under Ownership Interest	4rex_NumberOfEthanolEntitiesUnderOwnershipInterest
Number of Ethanol Entities Under Majority Ownership Interest	2rex_NumberOfEthanolEntitiesUnderMajorityOwnershipInterest

X

- Definition

Number of ethanol entities which are majority ownership interests.

+ References

No definition available.

+ Details

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Namespace Prefix:	rex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of ethanol entities under ownership interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	rex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DisclosureTextBlockAbstract
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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration