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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 12 Months Ended
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.                      
Net income attributable to the stockholders of Argan, Inc. $ 7,018 $ 17,229 $ 27,139 $ 20,625 $ 20,351 $ 18,073 $ 19,674 $ 12,230 $ 72,011 $ 70,328 $ 36,345
Weighted average number of shares outstanding - (basic)                 15,522 15,066 14,757
Effect of stock options                 258 559 267
Weighted average number of shares outstanding - (diluted)                 15,780 15,625 15,024
Basic (in Dollars per share) $ 0.45 $ 1.11 $ 1.75 $ 1.33 $ 1.33 $ 1.19 $ 1.32 $ 0.82 $ 4.64 $ 4.67 $ 2.46
Diluted (in Dollars per share) $ 0.45 $ 1.09 $ 1.72 $ 1.31 $ 1.29 $ 1.16 $ 1.29 $ 0.81 $ 4.56 $ 4.50 $ 2.42