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Earnings (Loss) Per Share Attributable to the Stockholders of Argan (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Earnings (Loss) Per Share Attributable to the Stockholders of Argan, Inc (Textual) [Abstract]
Additional shares included in the calculation of diluted EPS	132,000	238,000	146,000	272,000
Shares covered by antidilutive stock options	404,000	389,000	241,000	389,000
Income (Loss) from Continuing Operations Attributable to Parent	$ 12,623,000	$ 6,201,000	$ 19,033,000	$ 10,924,000

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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- Definition

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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