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Income Per Share from Continuing Operations Attributable to REX Common Shareholders (Detail) - Schedule of Earnings Per Share Basic and Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 3,267	$ 772
Basic income per share from continuing operations attributable to REX common shareholders	8,158	8,360
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 0.40	$ 0.09
Effect of stock options	42	79
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 3,267	$ 772
Diluted income per share from continuing operations attributable to REX common shareholders	8,200	8,439
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 0.40	$ 0.09

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.

+ Details

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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.

+ Details

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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X

- 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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

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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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- 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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