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Earnings Per Share Attributable to the Stockholders of Argan - Additional Information (Detail)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Earnings Per Share [Abstract]
Additional shares included in the calculation of diluted EPS	227,000	383,000
Shares covered by antidilutive stock options	40,000	0

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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