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(LOSS) INCOME 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, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
(LOSS) INCOME PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.        
Net (loss) income attributable to the stockholders of Argan, Inc. $ (6,855) $ 32,434 $ (35,501) $ 54,243
Weighted average number of shares outstanding - basic 15,633 15,569 15,617 15,568
Effects of stock awards   133   117
Weighted average number of shares outstanding - diluted 15,633 15,702 15,617 15,685
Basic (in Dollars per share) $ (0.44) $ 2.08 $ (2.27) $ 3.48
Diluted (in Dollars per share) $ (0.44) $ 2.07 $ (2.27) $ 3.46