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Earnings Per Share Attributable to the Stockholders of Argan - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Earnings Per Share [Abstract]
Additional shares included in the calculation of diluted EPS	256,000	132,000	291,000	146,000
Shares covered by antidilutive stock options	0	404,000	0	241,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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