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		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 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)	$ 7,456	$ 23,200	$ 27,750	$ 66,855
Basic income per share from continuing operations attributable to REX common shareholders	6,915	8,170	7,460	8,157
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 1.08	$ 2.84	$ 3.72	$ 8.19
Effect of restricted stock	16		9	11
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 7,456	$ 23,200	$ 27,750	$ 66,855
Diluted income per share from continuing operations attributable to REX common shareholders	6,931	8,170	7,469	8,168
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 1.08	$ 2.84	$ 3.72	$ 8.18