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, 2016	Apr. 30, 2015
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Net income attributable to the stockholders of Argan, Inc.	$ 12,230	$ 7,503
Weighted average number of shares outstanding - basic	14,842	14,637
Effect of stock options	213	227
Weighted average number of shares outstanding - diluted	15,055	14,864
Basic (in Dollars per share)	$ 0.82	$ 0.51
Diluted (in Dollars per share)	$ 0.81	$ 0.50