NET INCOME PER SHARE FROM CONTINUING OPERATIONS (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 31,436	$ 86,776	$ 34,007
Basic net income per share from continuing operations attributable to REX common shareholders	7,297	8,109	8,137
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.31	$ 10.70	$ 4.18
Effect of restricted stock	10	9	43
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars)	$ 31,436	$ 86,776	$ 34,007
Diluted net income per share from continuing operations attributable to REX common shareholders	7,307	8,118	8,180
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.30	$ 10.69	$ 4.16