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NET INCOME PER SHARE FROM CONTINUING OPERATIONS (Details) - Schedule of Earnings Per Share, Basic and Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 86,776rex_IncomeLossFromContinuingOperationsBasic	$ 34,007rex_IncomeLossFromContinuingOperationsBasic
Basic net income per share from continuing operations attributable to REX common shareholders	8,109us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,137us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,272us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 10.70us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 4.18us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.33)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Effect of stock options	9us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	43us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 86,776rex_IncomeLossFromContinuingOperationsDiluted	$ 34,007rex_IncomeLossFromContinuingOperationsDiluted
Diluted net income per share from continuing operations attributable to REX common shareholders	8,118us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,180us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,272us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 10.69us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 4.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.33)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

X

- Definition

Amount of income (loss) from continuing operations attributable to the parent basic. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from continuing operations attributable to the parent diluted. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

+ References

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- Definition

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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