CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Net sales and revenue	$ 666,091,000	$ 656,639,000	$ 408,879,000
Cost of sales	601,940,000	643,037,000	374,048,000
Gross profit	64,151,000	13,602,000	34,831,000
Selling, general and administrative expenses	(17,846,000)	(12,546,000)	(10,376,000)
Equity in income of unconsolidated ethanol affiliates	17,175,000	627,000	21,532,000
Bargain purchase gain, net	8,990,000		3,541,000
Income from synthetic fuel investments			2,883,000
Interest income	136,000	124,000	367,000
Interest expense	(3,902,000)	(4,849,000)	(3,433,000)
Loss on early termination of debt	(5,000)		(1,000)
Other income	100,000	80,000	616,000
Loss on disposal of real estate and property and equipment, net		(490,000)
Loss on derivative financial instruments	(39,000)	(370,000)	(1,148,000)
Income (loss) from continuing operations before income taxes	59,770,000	(3,822,000)	48,812,000
(Provision) benefit for income taxes	(20,695,000)	1,627,000	(16,255,000)
Income (loss) from continuing operations	39,075,000	(2,195,000)	32,557,000
Income from discontinued operations, net of tax	413,000	471,000	700,000
Gain on disposal of discontinued operations, net of tax	741,000	136,000	441,000
Net income (loss)	40,229,000	(1,588,000)	33,698,000
Net income attributable to noncontrolling interests	(5,156,000)	(707,000)	(5,428,000)
Net income (loss) attributable to REX common shareholders	35,073,000	(2,295,000)	28,270,000
Weighted average shares outstanding – basic (in Shares)	8,137	8,272	9,117
Basic income (loss) per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.17	$ (0.35)	$ 2.97
Basic income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.05	$ 0.06	$ 0.08
Basic income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.09	$ 0.01	$ 0.05
Basic net income (loss) per share attributable to REX common shareholders (in Dollars per share)	$ 4.31	$ (0.28)	$ 3.10
Weighted average shares outstanding – diluted (in Shares)	8,180	8,272	9,187
Diluted income (loss) per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.15	$ (0.35)	$ 2.95
Diluted income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.05	$ 0.06	$ 0.08
Diluted income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.09	$ 0.01	$ 0.05
Diluted net income (loss) per share attributable to REX common shareholders (in Dollars per share)	$ 4.29	$ (0.28)	$ 3.08
Income (loss) from continuing operations, net of tax	33,919,000	(2,902,000)	27,129,000
Income from discontinued operations, net of tax	1,154,000	607,000	1,141,000
Net income (loss)	$ 35,073,000	$ (2,295,000)	$ 28,270,000