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RELATED PARTIES (Details) (One Earth Energy And Nu Gen Energy [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
One Earth Energy And Nu Gen Energy [Member]
RELATED PARTIES (Details) [Line Items]
Related Party Transaction, Purchases from Related Party	$ 164.7us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / dei_LegalEntityAxis = rex_OneEarthEnergyAndNuGenEnergyMember	$ 262.4us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / dei_LegalEntityAxis = rex_OneEarthEnergyAndNuGenEnergyMember

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- Details

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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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