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Income Per Share from Continuing Operations Attributable to REX Common Shareholders (Detail) - Reconciles the computation of basic and diluted net income per share from continuing operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 575	$ 1,972	$ 1,342	$ 6,111
Basic income per share from continuing operations attributable to REX common shareholders	8,347	9,513	8,354	9,473
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 0.07	$ 0.21	$ 0.16	$ 0.64
Effect of stock options	38	37	60	84
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 575	$ 1,972	$ 1,342	$ 6,111
Diluted income per share from continuing operations attributable to REX common shareholders	8,385	9,550	8,414	9,557
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 0.07	$ 0.21	$ 0.16	$ 0.64

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.

+ References

No definition available.

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X

- Definition

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

No definition available.

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X

- 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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- Definition

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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- Definition

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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X

- Definition

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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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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