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Related-Party Transactions (Details) (One Earth Energy [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
One Earth Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	$ 38.1us-gaap_CostsAndExpensesRelatedParty / dei_LegalEntityAxis = rex_OneEarthEnergyMember	$ 44.8us-gaap_CostsAndExpensesRelatedParty / dei_LegalEntityAxis = rex_OneEarthEnergyMember

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- Details

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Namespace Prefix:	rex_
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X

- Definition

Costs of sales and operating expenses for the period incurred from transactions with related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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