CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Net sales and revenue	$ 138,454,000	$ 166,188,000	$ 444,622,000	$ 520,001,000
Cost of sales	101,957,000	148,160,000	332,665,000	482,077,000
Gross profit	36,497,000	18,028,000	111,957,000	37,924,000
Selling, general and administrative expenses	(4,353,000)	(4,589,000)	(15,369,000)	(12,530,000)
Equity in income of unconsolidated affiliates	8,780,000	3,331,000	24,322,000	9,558,000
Interest and other income	103,000	69,000	243,000	158,000
Interest expense	(454,000)	(964,000)	(1,737,000)	(3,039,000)
Gains (losses) on derivative financial instruments, net	4,000	(23,000)	(1,000)	(29,000)
Income from continuing operations before income taxes	40,577,000	15,852,000	119,415,000	32,042,000
Provision for income taxes	(12,126,000)	(5,261,000)	(40,049,000)	(11,034,000)
Income from continuing operations	28,451,000	10,591,000	79,366,000	21,008,000
Income from discontinued operations, net of tax		287,000	5,000	556,000
Gain on disposal of discontinued operations, net of tax	138,000	600,000	136,000	732,000
Net income	28,589,000	11,478,000	79,507,000	22,296,000
Net income attributable to noncontrolling interests	(5,249,000)	(1,611,000)	(12,518,000)	(3,097,000)
Net income attributable to REX common shareholders	23,340,000	9,867,000	66,989,000	19,199,000
Weighted average shares outstanding – basic (in Shares)	8,170	8,140	8,157	8,154
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.84	$ 1.10	$ 8.19	$ 2.19
Basic income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)		$ 0.04		$ 0.07
Basic income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.02	$ 0.07	$ 0.02	$ 0.09
Basic net income per share attributable to REX common shareholders (in Dollars per share)	$ 2.86	$ 1.21	$ 8.21	$ 2.35
Weighted average shares outstanding – diluted (in Shares)	8,170	8,179	8,168	8,197
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 2.84	$ 1.10	$ 8.18	$ 2.18
Diluted income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)		$ 0.04		$ 0.07
Diluted income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.02	$ 0.07	$ 0.02	$ 0.09
Diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 2.86	$ 1.21	$ 8.20	$ 2.34
Amounts attributable to REX common shareholders:
Income from continuing operations, net of tax	23,202,000	8,980,000	66,848,000	17,911,000
Income from discontinued operations, net of tax	138,000	887,000	141,000	1,288,000
Net income	$ 23,340,000	$ 9,867,000	$ 66,989,000	$ 19,199,000