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Earnings (Loss) Per Share Attributable to Stockholders of Argan - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Earnings Per Share [Abstract]
Additional shares included in the calculation of diluted EPS	272,000	284,000	280,000	347,000
Shares covered by antidilutive stock options	147,000	121,000	267,000	389,000
Income (loss) from continuing operations attributable to parent	$ 11,928,000	$ 6,065,000	$ 30,961,000	$ 16,989,000

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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