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OTHER ASSETS (Detail) - Future Amortization of Prepaid Commissions (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
2014	$ 164

X

- Definition

Amortization of prepaid commissions next rolling twelve months.

+ References

No definition available.

+ Details

Name:	rex_AmortizationOfPrepaidCommissionsNextRollingTwelveMonths
Namespace Prefix:	rex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant