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Earnings Per Share Attributable to the Stockholders of Argan - Additional Information (Detail)
3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Earnings Per Share [Abstract]        
Additional shares included in the calculation of diluted EPS 325,000 272,000 371,000 280,000
Shares covered by antidilutive stock options 40,000 147,000 40,000 267,000