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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		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Net income attributable to the stockholders of Argan, Inc.	$ 27,139	$ 19,674	$ 47,764	$ 31,904
Weighted average number of shares outstanding - basic	15,514	14,939	15,491	14,899
Effect of stock options	273	339	297	332
Weighted average number of shares outstanding - diluted	15,787	15,278	15,788	15,231
Basic (in dollars per share)	$ 1.75	$ 1.32	$ 3.08	$ 2.14
Diluted (in dollars per share)	$ 1.72	$ 1.29	$ 3.03	$ 2.09

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