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, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Schedule of Earnings Per Share Basic and Diluted [Abstract]
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 9,069	$ 325	$ 18,108	$ 1,761
Basic income per share from continuing operations attributable to REX common shareholders	8,140	8,226	8,154	8,311
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 1.11	$ 0.04	$ 2.22	$ 0.21
Effect of stock options	39	32	43	50
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 9,069	$ 325	$ 18,108	$ 1,761
Diluted income per share from continuing operations attributable to REX common shareholders	8,179	8,258	8,197	8,361
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 1.11	$ 0.04	$ 2.21	$ 0.21