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		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 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)	$ 21,900	$ 5,704	$ 43,633	$ 8,915
Basic income per share from continuing operations attributable to REX common shareholders	8,182	8,164	8,150	8,161
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.68	$ 0.70	$ 5.36	$ 1.09
Effect of stock options		40	16	43
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 21,900	$ 5,704	$ 43,633	$ 8,915
Diluted income per share from continuing operations attributable to REX common shareholders	8,182	8,204	8,166	8,204
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.68	$ 0.70	$ 5.35	$ 1.09