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NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Net income (loss) attributable to the stockholders of Argan, Inc.	$ 23,851	$ (42,689)	$ 52,036
Weighted average number of shares outstanding - basic	15,668	15,621	15,569
Effects of stock awards	157		124
Weighted average number of shares outstanding - diluted	15,825	15,621	15,693
Basic	$ 1.52	$ (2.73)	$ 3.34
Diluted	$ 1.51	$ (2.73)	$ 3.32

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