NET LOSS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
NET LOSS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Net loss attributable to the stockholders of Argan, Inc.	$ (763)	$ (29,800)
Weighted average number of shares outstanding - basic	15,643	15,583
Weighted average number of shares outstanding - diluted	15,643	15,583
Basic (in Dollars per share)	$ (0.05)	$ (1.91)
Diluted (in Dollars per share)	$ (0.05)	$ (1.91)