3.7.0.1 html 92 204 1 false 40 0 false 7 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.arganinc.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS Sheet http://www.arganinc.com/role/StatementCondensedConsolidatedStatementsOfEarnings CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS Statements 2 false false R3.htm 00200 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://www.arganinc.com/role/StatementCondensedConsolidatedBalanceSheets CONDENSED CONSOLIDATED BALANCE SHEETS Statements 3 false false R4.htm 00205 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.arganinc.com/role/StatementCondensedConsolidatedBalanceSheetsParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 4 false false R5.htm 00300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.arganinc.com/role/StatementCondensedConsolidatedStatementsOfCashFlows CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 5 false false R6.htm 10101 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION Sheet http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentation DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION Notes 6 false false R7.htm 10201 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS Sheet http://www.arganinc.com/role/DisclosureRecentlyIssuedAccountingPronouncements RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS Notes 7 false false R8.htm 10301 - Disclosure - CONSTRUCTION JOINT VENTURES Sheet http://www.arganinc.com/role/DisclosureConstructionJointVentures CONSTRUCTION JOINT VENTURES Notes 8 false false R9.htm 10401 - Disclosure - CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS Sheet http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndShortTermInvestments CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS Notes 9 false false R10.htm 10501 - Disclosure - ACCOUNTS RECEIVABLE Sheet http://www.arganinc.com/role/DisclosureAccountsReceivable ACCOUNTS RECEIVABLE Notes 10 false false R11.htm 10601 - Disclosure - COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS Sheet http://www.arganinc.com/role/DisclosureCostsEstimatedEarningsAndBillingsOnUncompletedContracts COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS Notes 11 false false R12.htm 10701 - Disclosure - PURCHASED INTANGIBLE ASSETS Sheet http://www.arganinc.com/role/DisclosurePurchasedIntangibleAssets PURCHASED INTANGIBLE ASSETS Notes 12 false false R13.htm 10801 - Disclosure - FINANCING ARRANGEMENTS Sheet http://www.arganinc.com/role/DisclosureFinancingArrangements FINANCING ARRANGEMENTS Notes 13 false false R14.htm 10901 - Disclosure - LEGAL MATTERS Sheet http://www.arganinc.com/role/DisclosureLegalMatters LEGAL MATTERS Notes 14 false false R15.htm 11001 - Disclosure - STOCK-BASED COMPENSATION Sheet http://www.arganinc.com/role/DisclosureStockBasedCompensation STOCK-BASED COMPENSATION Notes 15 false false R16.htm 11101 - Disclosure - INCOME TAXES Sheet http://www.arganinc.com/role/DisclosureIncomeTaxes INCOME TAXES Notes 16 false false R17.htm 11201 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. Sheet http://www.arganinc.com/role/DisclosureEarningsPerShareAttributableToStockholdersOfArganInc EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. Notes 17 false false R18.htm 11301 - Disclosure - CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE Sheet http://www.arganinc.com/role/DisclosureConcentrationsOfRevenuesAndAccountsReceivable CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE Notes 18 false false R19.htm 11401 - Disclosure - SEGMENT REPORTING Sheet http://www.arganinc.com/role/DisclosureSegmentReporting SEGMENT REPORTING Notes 19 false false R20.htm 11501 - Disclosure - SUBSEQUENT EVENT Sheet http://www.arganinc.com/role/DisclosureSubsequentEvent SUBSEQUENT EVENT Notes 20 false false R21.htm 20102 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Policies) Sheet http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentationPolicies DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Policies) Policies 21 false false R22.htm 30603 - Disclosure - COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Tables) Sheet http://www.arganinc.com/role/DisclosureCostsEstimatedEarningsAndBillingsOnUncompletedContractsTables COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Tables) Tables http://www.arganinc.com/role/DisclosureCostsEstimatedEarningsAndBillingsOnUncompletedContracts 22 false false R23.htm 30703 - Disclosure - PURCHASED INTANGIBLE ASSETS (Tables) Sheet http://www.arganinc.com/role/DisclosurePurchasedIntangibleAssetsTables PURCHASED INTANGIBLE ASSETS (Tables) Tables http://www.arganinc.com/role/DisclosurePurchasedIntangibleAssets 23 false false R24.htm 31003 - Disclosure - STOCK-BASED COMPENSATION (Tables) Sheet http://www.arganinc.com/role/DisclosureStockBasedCompensationTables STOCK-BASED COMPENSATION (Tables) Tables http://www.arganinc.com/role/DisclosureStockBasedCompensation 24 false false R25.htm 31103 - Disclosure - INCOME TAXES (Tables) Sheet http://www.arganinc.com/role/DisclosureIncomeTaxesTables INCOME TAXES (Tables) Tables http://www.arganinc.com/role/DisclosureIncomeTaxes 25 false false R26.htm 31203 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Tables) Sheet http://www.arganinc.com/role/DisclosureEarningsPerShareAttributableToStockholdersOfArganIncTables EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Tables) Tables http://www.arganinc.com/role/DisclosureEarningsPerShareAttributableToStockholdersOfArganInc 26 false false R27.htm 31403 - Disclosure - SEGMENT REPORTING (Tables) Sheet http://www.arganinc.com/role/DisclosureSegmentReportingTables SEGMENT REPORTING (Tables) Tables http://www.arganinc.com/role/DisclosureSegmentReporting 27 false false R28.htm 40101 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) Sheet http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentationDetails DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) Details http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentationPolicies 28 false false R29.htm 40301 - Disclosure - CONSTRUCTION JOINT VENTURES (Details) Sheet http://www.arganinc.com/role/DisclosureConstructionJointVenturesDetails CONSTRUCTION JOINT VENTURES (Details) Details http://www.arganinc.com/role/DisclosureConstructionJointVentures 29 false false R30.htm 40401 - Disclosure - CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details) Sheet http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndShortTermInvestmentsDetails CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details) Details http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndShortTermInvestments 30 false false R31.htm 40501 - Disclosure - ACCOUNTS RECEIVABLE (Details) Sheet http://www.arganinc.com/role/DisclosureAccountsReceivableDetails ACCOUNTS RECEIVABLE (Details) Details http://www.arganinc.com/role/DisclosureAccountsReceivable 31 false false R32.htm 40601 - Disclosure - COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Details) Sheet http://www.arganinc.com/role/DisclosureCostsEstimatedEarningsAndBillingsOnUncompletedContractsDetails COSTS, ESTIMATED EARNINGS AND BILLINGS ON UNCOMPLETED CONTRACTS (Details) Details http://www.arganinc.com/role/DisclosureCostsEstimatedEarningsAndBillingsOnUncompletedContractsTables 32 false false R33.htm 40701 - Disclosure - PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) Sheet http://www.arganinc.com/role/DisclosurePurchasedIntangibleAssetsGoodwillAndFiniteLivedIntangibleAssetsDetails PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) Details 33 false false R34.htm 40702 - Disclosure - PURCHASED INTANGIBLE ASSETS - Indefinite Lived Intangible Assets - Trade Name (Details) Sheet http://www.arganinc.com/role/DisclosurePurchasedIntangibleAssetsIndefiniteLivedIntangibleAssetsTradeNameDetails PURCHASED INTANGIBLE ASSETS - Indefinite Lived Intangible Assets - Trade Name (Details) Details 34 false false R35.htm 40801 - Disclosure - FINANCING ARRANGEMENTS (Details) Sheet http://www.arganinc.com/role/DisclosureFinancingArrangementsDetails FINANCING ARRANGEMENTS (Details) Details http://www.arganinc.com/role/DisclosureFinancingArrangements 35 false false R36.htm 40901 - Disclosure - LEGAL MATTERS (Details) Sheet http://www.arganinc.com/role/DisclosureLegalMattersDetails LEGAL MATTERS (Details) Details http://www.arganinc.com/role/DisclosureLegalMatters 36 false false R37.htm 41001 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details) Sheet http://www.arganinc.com/role/DisclosureStockBasedCompensationAdditionalInformationDetails STOCK-BASED COMPENSATION - Additional Information (Details) Details 37 false false R38.htm 41002 - Disclosure - STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) Sheet http://www.arganinc.com/role/DisclosureStockBasedCompensationSummaryOfActivityUnderCompanySStockOptionPlansDetails STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) Details 38 false false R39.htm 41003 - Disclosure - STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) Sheet http://www.arganinc.com/role/DisclosureStockBasedCompensationSummaryOfChangeInNumberOfNonVestedOptionsToPurchaseSharesOfCommonStockDetails STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) Details 39 false false R40.htm 41004 - Disclosure - STOCK-BASED COMPENSATION - Summary of Assumptions Used to Estimate Fair Value of Stock Options Granted (Details) Sheet http://www.arganinc.com/role/DisclosureStockBasedCompensationSummaryOfAssumptionsUsedToEstimateFairValueOfStockOptionsGrantedDetails STOCK-BASED COMPENSATION - Summary of Assumptions Used to Estimate Fair Value of Stock Options Granted (Details) Details 40 false false R41.htm 41101 - Disclosure - INCOME TAXES (Details) Sheet http://www.arganinc.com/role/DisclosureIncomeTaxesDetails INCOME TAXES (Details) Details http://www.arganinc.com/role/DisclosureIncomeTaxesTables 41 false false R42.htm 41102 - Disclosure - INCOME TAXES - Reconciliation of Expected Income Tax Expense to Actual Income Tax Expense (Details) Sheet http://www.arganinc.com/role/DisclosureIncomeTaxesReconciliationOfExpectedIncomeTaxExpenseToActualIncomeTaxExpenseDetails INCOME TAXES - Reconciliation of Expected Income Tax Expense to Actual Income Tax Expense (Details) Details 42 false false R43.htm 41103 - Disclosure - INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities (Details) Sheet http://www.arganinc.com/role/DisclosureIncomeTaxesScheduleOfTaxEffectsOfTemporaryDifferencesThatGaveRiseToDeferredTaxAssetsAndLiabilitiesDetails INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities (Details) Details 43 false false R44.htm 41201 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details) Sheet http://www.arganinc.com/role/DisclosureEarningsPerShareAttributableToStockholdersOfArganIncDetails EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details) Details http://www.arganinc.com/role/DisclosureEarningsPerShareAttributableToStockholdersOfArganIncTables 44 false false R45.htm 41301 - Disclosure - CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE (Details) Sheet http://www.arganinc.com/role/DisclosureConcentrationsOfRevenuesAndAccountsReceivableDetails CONCENTRATIONS OF REVENUES AND ACCOUNTS RECEIVABLE (Details) Details http://www.arganinc.com/role/DisclosureConcentrationsOfRevenuesAndAccountsReceivable 45 false false R46.htm 41401 - Disclosure - SEGMENT REPORTING (Details) Sheet http://www.arganinc.com/role/DisclosureSegmentReportingDetails SEGMENT REPORTING (Details) Details http://www.arganinc.com/role/DisclosureSegmentReportingTables 46 false false R47.htm 41501 - Disclosure - SUBSEQUENT EVENT (Details) Sheet http://www.arganinc.com/role/DisclosureSubsequentEventDetails SUBSEQUENT EVENT (Details) Details http://www.arganinc.com/role/DisclosureSubsequentEvent 47 false false All Reports Book All Reports agx-20170430.xml agx-20170430.xsd agx-20170430_cal.xml agx-20170430_def.xml agx-20170430_lab.xml agx-20170430_pre.xml true true