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
	Apr. 30, 2014	Apr. 30, 2013
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 21,687	$ 3,205
Basic income per share from continuing operations attributable to REX common shareholders	8,117	8,158
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.67	$ 0.39
Effect of stock options	32	42
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 21,687	$ 3,205
Diluted income per share from continuing operations attributable to REX common shareholders	8,149	8,200
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.66	$ 0.39