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Subsequent Event (Purchase of Atlantic Projects Company Limited) - Summary of Pro Forma Information (Detail) (Atlantic Projects Company Limited [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014
Atlantic Projects Company Limited [Member] |  |
Business Acquisition [Line Items] |  |
Pro forma revenues | $ 92,752 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember | $ 57,717 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember
Pro forma net income | 11,611 agx_BusinessAcquisitionsProFormaProfitLoss / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember | 4,404 agx_BusinessAcquisitionsProFormaProfitLoss / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember
Pro forma net income attributable to the stockholders of Argan, Inc. | $ 8,263 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember | $ 3,079 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember
Pro forma earnings per share attributable to the stockholders of Argan, Inc. |  |
Basic | $ 0.56 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember | $ 0.21 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember
Diluted | $ 0.55 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember | $ 0.21 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember

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