CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Net sales and revenue	$ 164,104	$ 83,250
Cost of sales (includes $16.7 million and $12.3 million with related parties for the quarters ended April 30, 2021 and 2020, respectively)	146,302	92,580
Gross profit (loss)	17,802	(9,330)
Selling, general and administrative expenses (includes $(0.3) million with related parties for the quarter ended April 30, 2020)	(9,988)	(4,605)
Equity in income (loss) of unconsolidated affiliates	570	(477)
Interest and other income, (net)	43	669
Income (loss) before income taxes	8,427	(13,743)
(Provision) benefit for income taxes	(29)	5,313
Net income (loss)	8,398	(8,430)
Net (income) loss attributable to noncontrolling interests	(614)	795
Net income (loss) attributable to REX common shareholders	$ 7,784	$ (7,635)
Weighted average shares outstanding – basic and diluted (in Shares)	6,010	6,304
Basic and diluted net income (loss) per share attributable to REX common shareholders (in Dollars per share)	$ 1.30	$ (1.21)