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EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. - Antidilutive Shares (Details) - shares
3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2017
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.    
Antidilutive shares excluded from the diluted earnings per share computation 260,000 155,000