Income Per Share from Continuing Operations Attributable to REX Common Shareholders (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 16,367	$ 21,914	$ 20,294	$ 43,653
Basic income per share from continuing operations attributable to REX common shareholders	7,580	8,182	7,737	8,150
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.16	$ 2.68	$ 2.62	$ 5.36
Effect of restricted stock				16
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 16,367	$ 21,914	$ 20,294	$ 43,653
Diluted income per share from continuing operations attributable to REX common shareholders	7,580	8,182	7,737	8,166
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.16	$ 2.68	$ 2.62	$ 5.35