NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN
Net income (loss) attributable to the stockholders of Argan	$ 7,485	$ 10,766
Weighted average number of shares outstanding - basic	14,910	15,726
Effects of stock awards	82	235
Weighted average number of shares outstanding - diluted	14,992	15,961
Basic	$ 0.50	$ 0.68
Diluted	$ 0.50	$ 0.67