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(LOSS) INCOME PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. - Antidilutive Shares (Details) - shares
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2018
(LOSS) INCOME PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.    
Antidilutive stock options 581,500 581,500