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Income Per Share from Continuing Operations Attributable to REX Common Shareholders (Details) - Schedule of Earnings Per Share, Basic and Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 23,202	$ 8,980	$ 66,848	$ 17,911
Basic income per share from continuing operations attributable to REX common shareholders	8,170	8,140	8,157	8,154
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.84	$ 1.10	$ 8.19	$ 2.19
Effect of stock options		39	11	43
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 23,202	$ 8,980	$ 66,848	$ 17,911
Diluted income per share from continuing operations attributable to REX common shareholders	8,170	8,179	8,168	8,197
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.84	$ 1.10	$ 8.18	$ 2.18

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

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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.

+ References

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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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