NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN
Net income (loss) attributable to the stockholders of Argan	$ 38,244	$ 23,851	$ (42,689)
Weighted average number of shares outstanding - basic	15,715	15,668	15,621
Effects of stock awards	198	157
Weighted average number of shares outstanding - diluted	15,913	15,825	15,621
Basic	$ 2.43	$ 1.52	$ (2.73)
Diluted	$ 2.40	$ 1.51	$ (2.73)