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Earnings Per Share Attributable to the Stockholders of Argan - Additional Information (Detail)	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Earnings Per Share [Abstract]
Additional shares included in the calculation of diluted EPS	383,000	151,000
Shares covered by antidilutive stock options	0	240,000

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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