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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
Apr. 30, 2015
Apr. 30, 2014
Atlantic Projects Company Limited [Member]
    
Business Acquisition [Line Items]    
Pro forma revenues $ 92,752us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember		 $ 57,717us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember
Pro forma net income 11,611agx_BusinessAcquisitionsProFormaProfitLoss
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember		 4,404agx_BusinessAcquisitionsProFormaProfitLoss
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember
Pro forma net income attributable to the stockholders of Argan, Inc. $ 8,263us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember		 $ 3,079us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember
Pro forma earnings per share attributable to the stockholders of Argan, Inc.    
Basic $ 0.56us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember		 $ 0.21us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember
Diluted $ 0.55us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember		 $ 0.21us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= agx_AtlanticProjectsCompanyLimitedMember