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EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Net income attributable to the stockholders of Argan, Inc.	$ 32,434	$ 17,229	$ 54,243	$ 64,993
Weighted average number of shares outstanding - basic	15,569	15,545	15,568	15,509
Effect of stock awards	133	248	117	287
Weighted average number of shares outstanding - diluted	15,702	15,793	15,685	15,796
Basic (in Dollars per share)	$ 2.08	$ 1.11	$ 3.48	$ 4.19
Diluted (in Dollars per share)	$ 2.07	$ 1.09	$ 3.46	$ 4.11

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