Net Income Per Share 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
	Apr. 30, 2016	Apr. 30, 2015
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic net income per share attributable to REX common shareholders (in Dollars)	$ 2,838	$ 3,927
Basic net income per share attributable to REX common shareholders	6,573	7,900
Basic net income per share attributable to REX common shareholders (in Dollars per share)	$ 0.43	$ 0.50
Effect of restricted stock	21
Diluted net income per share attributable to REX common shareholders (in Dollars)	$ 2,838	$ 3,927
Diluted net income per share attributable to REX common shareholders	6,594	7,900
Diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 0.43	$ 0.50