(LOSS) EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
(LOSS) EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Net (loss) income attributable to the stockholders of Argan, Inc.	$ (29,800)	$ 4,837
Weighted average number of shares outstanding - basic	15,583	15,568
Effects of stock awards		88
Weighted average number of shares outstanding - diluted	15,583	15,656
Basic (in Dollars per share)	$ (1.91)	$ 0.31
Diluted (in Dollars per share)	$ (1.91)	$ 0.31