CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Net sales and revenue	$ 372,846	$ 418,034	$ 486,671
Cost of sales (includes $54.8 million, $171.5 million and $176.8 million with related parties for the years ended January 31, 2021, 2020 and 2019, respectively)	358,985	405,549	456,456
Gross profit	13,861	12,485	30,215
Selling, general and administrative expenses (includes $(0.2) million, $(0.7) million and $0.8 million with related parties for the years ended January 31, 2021, 2020, and 2019, respectively)	(17,661)	(19,258)	(20,551)
Equity in income of unconsolidated affiliates	500	1,392	1,536
Interest and other income, net	1,818	4,212	3,388
(Loss) income before income taxes	(1,482)	(1,169)	14,588
Benefit for income taxes	7,100	12,813	22,922
Net income	5,618	11,644	37,510
Net income attributable to noncontrolling interests	(2,617)	(4,217)	(5,865)
Net income attributable to REX common shareholders	$ 3,001	$ 7,427	$ 31,645
Weighted average shares outstanding – basic and diluted (in Shares)	6,167	6,318	6,440
Basic and diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 0.49	$ 1.18	$ 4.91