| | | | | | | | | | | | | | | | | | | | | |
<?xml version="1.0" encoding="windows-1252"?> |
<FilingSummary> |
| <Version> 3.24.1.u1 </Version> |
| <ProcessingTime/> |
| <ReportFormat> html </ReportFormat> |
| <ContextCount> 204 </ContextCount> |
| <ElementCount> 421 </ElementCount> |
| <EntityCount> 1 </EntityCount> |
| <FootnotesReported> false </FootnotesReported> |
| <SegmentCount> 69 </SegmentCount> |
| <ScenarioCount> 0 </ScenarioCount> |
| <TuplesReported> false </TuplesReported> |
| <UnitCount> 6 </UnitCount> |
| <MyReports> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R1.htm </HtmlFileName> |
| | | <LongName> 00090 - Document - Document and Entity Information </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DocumentDocumentAndEntityInformation </Role> |
| | | <ShortName> Document and Entity Information </ShortName> |
| | | <MenuCategory> Cover </MenuCategory> |
| | | <Position> 1 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R2.htm </HtmlFileName> |
| | | <LongName> 00100 - Statement - CONSOLIDATED STATEMENTS OF EARNINGS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/StatementConsolidatedStatementsOfEarnings </Role> |
| | | <ShortName> CONSOLIDATED STATEMENTS OF EARNINGS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 2 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R3.htm </HtmlFileName> |
| | | <LongName> 00200 - Statement - CONSOLIDATED BALANCE SHEETS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/StatementConsolidatedBalanceSheets </Role> |
| | | <ShortName> CONSOLIDATED BALANCE SHEETS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 3 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R4.htm </HtmlFileName> |
| | | <LongName> 00205 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/StatementConsolidatedBalanceSheetsParenthetical </Role> |
| | | <ShortName> CONSOLIDATED BALANCE SHEETS (Parenthetical) </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 4 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R5.htm </HtmlFileName> |
| | | <LongName> 00300 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/StatementConsolidatedStatementsOfStockholdersEquity </Role> |
| | | <ShortName> CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 5 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R6.htm </HtmlFileName> |
| | | <LongName> 00400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/StatementConsolidatedStatementsOfCashFlows </Role> |
| | | <ShortName> CONSOLIDATED STATEMENTS OF CASH FLOWS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 6 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R7.htm </HtmlFileName> |
| | | <LongName> 10101 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentation </Role> |
| | | <ShortName> DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 7 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R8.htm </HtmlFileName> |
| | | <LongName> 10201 - Disclosure - REVENUES FROM CONTRACTS WITH CUSTOMERS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomers </Role> |
| | | <ShortName> REVENUES FROM CONTRACTS WITH CUSTOMERS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 8 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R9.htm </HtmlFileName> |
| | | <LongName> 10301 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestments </Role> |
| | | <ShortName> CASH, CASH EQUIVALENTS AND INVESTMENTS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 9 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R10.htm </HtmlFileName> |
| | | <LongName> 10401 - Disclosure - FAIR VALUE MEASUREMENTS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureFairValueMeasurements </Role> |
| | | <ShortName> FAIR VALUE MEASUREMENTS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 10 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R11.htm </HtmlFileName> |
| | | <LongName> 10501 - Disclosure - ACCOUNTS RECEIVABLE </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureAccountsReceivable </Role> |
| | | <ShortName> ACCOUNTS RECEIVABLE </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 11 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R12.htm </HtmlFileName> |
| | | <LongName> 10601 - Disclosure - INTANGIBLE ASSETS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIntangibleAssets </Role> |
| | | <ShortName> INTANGIBLE ASSETS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 12 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R13.htm </HtmlFileName> |
| | | <LongName> 10701 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosurePropertyPlantAndEquipmentNet </Role> |
| | | <ShortName> PROPERTY, PLANT AND EQUIPMENT, NET </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 13 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R14.htm </HtmlFileName> |
| | | <LongName> 10801 - Disclosure - FINANCING ARRANGEMENTS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureFinancingArrangements </Role> |
| | | <ShortName> FINANCING ARRANGEMENTS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 14 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R15.htm </HtmlFileName> |
| | | <LongName> 10901 - Disclosure - COMMITMENTS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCommitments </Role> |
| | | <ShortName> COMMITMENTS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 15 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R16.htm </HtmlFileName> |
| | | <LongName> 11001 - Disclosure - LEGAL CONTINGENCIES </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureLegalContingencies </Role> |
| | | <ShortName> LEGAL CONTINGENCIES </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 16 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R17.htm </HtmlFileName> |
| | | <LongName> 11101 - Disclosure - STOCK-BASED COMPENSATION </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureStockBasedCompensation </Role> |
| | | <ShortName> STOCK-BASED COMPENSATION </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 17 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R18.htm </HtmlFileName> |
| | | <LongName> 11201 - Disclosure - INCOME TAXES </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxes </Role> |
| | | <ShortName> INCOME TAXES </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 18 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R19.htm </HtmlFileName> |
| | | <LongName> 11301 - Disclosure - NET INCOME PER SHARE </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureNetIncomePerShare </Role> |
| | | <ShortName> NET INCOME PER SHARE </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 19 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R20.htm </HtmlFileName> |
| | | <LongName> 11401 - Disclosure - CASH DIVIDENDS AND COMMON STOCK REPURCHASES </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashDividendsAndCommonStockRepurchases </Role> |
| | | <ShortName> CASH DIVIDENDS AND COMMON STOCK REPURCHASES </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 20 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R21.htm </HtmlFileName> |
| | | <LongName> 11501 - Disclosure - VARIABLE INTEREST ENTITY </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureVariableInterestEntity </Role> |
| | | <ShortName> VARIABLE INTEREST ENTITY </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 21 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R22.htm </HtmlFileName> |
| | | <LongName> 11601 - Disclosure - CUSTOMER CONCENTRATIONS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCustomerConcentrations </Role> |
| | | <ShortName> CUSTOMER CONCENTRATIONS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 22 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R23.htm </HtmlFileName> |
| | | <LongName> 11701 - Disclosure - SEGMENT REPORTING </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSegmentReporting </Role> |
| | | <ShortName> SEGMENT REPORTING </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 23 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R24.htm </HtmlFileName> |
| | | <LongName> 11801 - Disclosure - SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSupplementalFinancialStatementInformation </Role> |
| | | <ShortName> SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 24 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R25.htm </HtmlFileName> |
| | | <LongName> 11901 - Disclosure - SUBSEQUENT EVENTS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSubsequentEvents </Role> |
| | | <ShortName> SUBSEQUENT EVENTS </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 25 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R26.htm </HtmlFileName> |
| | | <LongName> 20102 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Policies) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentationPolicies </Role> |
| | | <ShortName> DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Policies) </ShortName> |
| | | <MenuCategory> Policies </MenuCategory> |
| | | <Position> 26 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R27.htm </HtmlFileName> |
| | | <LongName> 30203 - Disclosure - REVENUES FROM CONTRACTS WITH CUSTOMERS (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomersTables </Role> |
| | | <ShortName> REVENUES FROM CONTRACTS WITH CUSTOMERS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomers </ParentRole> |
| | | <Position> 27 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R28.htm </HtmlFileName> |
| | | <LongName> 30303 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestmentsTables </Role> |
| | | <ShortName> CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestments </ParentRole> |
| | | <Position> 28 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R29.htm </HtmlFileName> |
| | | <LongName> 30403 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureFairValueMeasurementsTables </Role> |
| | | <ShortName> FAIR VALUE MEASUREMENTS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureFairValueMeasurements </ParentRole> |
| | | <Position> 29 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R30.htm </HtmlFileName> |
| | | <LongName> 30603 - Disclosure - INTANGIBLE ASSETS (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIntangibleAssetsTables </Role> |
| | | <ShortName> INTANGIBLE ASSETS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureIntangibleAssets </ParentRole> |
| | | <Position> 30 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R31.htm </HtmlFileName> |
| | | <LongName> 30703 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosurePropertyPlantAndEquipmentNetTables </Role> |
| | | <ShortName> PROPERTY, PLANT AND EQUIPMENT, NET (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosurePropertyPlantAndEquipmentNet </ParentRole> |
| | | <Position> 31 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R32.htm </HtmlFileName> |
| | | <LongName> 30903 - Disclosure - COMMITMENTS (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCommitmentsTables </Role> |
| | | <ShortName> COMMITMENTS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureCommitments </ParentRole> |
| | | <Position> 32 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R33.htm </HtmlFileName> |
| | | <LongName> 31103 - Disclosure - STOCK-BASED COMPENSATION (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureStockBasedCompensationTables </Role> |
| | | <ShortName> STOCK-BASED COMPENSATION (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureStockBasedCompensation </ParentRole> |
| | | <Position> 33 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R34.htm </HtmlFileName> |
| | | <LongName> 31203 - Disclosure - INCOME TAXES (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesTables </Role> |
| | | <ShortName> INCOME TAXES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureIncomeTaxes </ParentRole> |
| | | <Position> 34 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R35.htm </HtmlFileName> |
| | | <LongName> 31303 - Disclosure - NET INCOME PER SHARE (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureNetIncomePerShareTables </Role> |
| | | <ShortName> NET INCOME PER SHARE (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureNetIncomePerShare </ParentRole> |
| | | <Position> 35 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R36.htm </HtmlFileName> |
| | | <LongName> 31703 - Disclosure - SEGMENT REPORTING (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSegmentReportingTables </Role> |
| | | <ShortName> SEGMENT REPORTING (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureSegmentReporting </ParentRole> |
| | | <Position> 36 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R37.htm </HtmlFileName> |
| | | <LongName> 31803 - Disclosure - SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSupplementalFinancialStatementInformationTables </Role> |
| | | <ShortName> SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureSupplementalFinancialStatementInformation </ParentRole> |
| | | <Position> 37 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R38.htm </HtmlFileName> |
| | | <LongName> 40101 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentationDetails </Role> |
| | | <ShortName> DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureDescriptionOfBusinessAndBasisOfPresentationPolicies </ParentRole> |
| | | <Position> 38 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R39.htm </HtmlFileName> |
| | | <LongName> 40201 - Disclosure - REVENUES FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomersDisaggregationOfRevenuesDetails </Role> |
| | | <ShortName> REVENUES FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 39 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R40.htm </HtmlFileName> |
| | | <LongName> 40202 - Disclosure - REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomersDetails </Role> |
| | | <ShortName> REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomersTables </ParentRole> |
| | | <Position> 40 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R41.htm </HtmlFileName> |
| | | <LongName> 40203 - Disclosure - REVENUES FROM CONTRACTS WITH CUSTOMERS - Remaining Unsatisfied Performance Obligations (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureRevenuesFromContractsWithCustomersRemainingUnsatisfiedPerformanceObligationsDetails </Role> |
| | | <ShortName> REVENUES FROM CONTRACTS WITH CUSTOMERS - Remaining Unsatisfied Performance Obligations (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 41 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R42.htm </HtmlFileName> |
| | | <LongName> 40301 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestmentsDetails </Role> |
| | | <ShortName> CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestmentsTables </ParentRole> |
| | | <Position> 42 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R43.htm </HtmlFileName> |
| | | <LongName> 40302 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS - Investments (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestmentsInvestmentsDetails </Role> |
| | | <ShortName> CASH, CASH EQUIVALENTS AND INVESTMENTS - Investments (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 43 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R44.htm </HtmlFileName> |
| | | <LongName> 40303 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestmentsAvailableForSaleSecuritiesDetails </Role> |
| | | <ShortName> CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 44 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R45.htm </HtmlFileName> |
| | | <LongName> 40304 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS - Earnings on Invested Funds (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashCashEquivalentsAndInvestmentsEarningsOnInvestedFundsDetails </Role> |
| | | <ShortName> CASH, CASH EQUIVALENTS AND INVESTMENTS - Earnings on Invested Funds (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 45 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R46.htm </HtmlFileName> |
| | | <LongName> 40401 - Disclosure - FAIR VALUE MEASUREMENTS - Financial Instruments on a Recurring Basis (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureFairValueMeasurementsFinancialInstrumentsOnRecurringBasisDetails </Role> |
| | | <ShortName> FAIR VALUE MEASUREMENTS - Financial Instruments on a Recurring Basis (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 46 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R47.htm </HtmlFileName> |
| | | <LongName> 40501 - Disclosure - ACCOUNTS RECEIVABLE (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureAccountsReceivableDetails </Role> |
| | | <ShortName> ACCOUNTS RECEIVABLE (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureAccountsReceivable </ParentRole> |
| | | <Position> 47 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R48.htm </HtmlFileName> |
| | | <LongName> 40601 - Disclosure - INTANGIBLE ASSETS - Changes in the Balances of Goodwill (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIntangibleAssetsChangesInBalancesOfGoodwillDetails </Role> |
| | | <ShortName> INTANGIBLE ASSETS - Changes in the Balances of Goodwill (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 48 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R49.htm </HtmlFileName> |
| | | <LongName> 40602 - Disclosure - INTANGIBLE ASSETS - Components of Intangible Assets (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIntangibleAssetsComponentsOfIntangibleAssetsDetails </Role> |
| | | <ShortName> INTANGIBLE ASSETS - Components of Intangible Assets (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 49 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R50.htm </HtmlFileName> |
| | | <LongName> 40603 - Disclosure - INTANGIBLE ASSETS - Finite Lived Intangible Future Amortization Schedule (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIntangibleAssetsFiniteLivedIntangibleFutureAmortizationScheduleDetails </Role> |
| | | <ShortName> INTANGIBLE ASSETS - Finite Lived Intangible Future Amortization Schedule (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 50 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R51.htm </HtmlFileName> |
| | | <LongName> 40604 - Disclosure - INTANGIBLE ASSETS - Additional Information - (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIntangibleAssetsAdditionalInformationDetails </Role> |
| | | <ShortName> INTANGIBLE ASSETS - Additional Information - (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 51 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R52.htm </HtmlFileName> |
| | | <LongName> 40701 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET - Summary of Property, Plant and Equipment (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosurePropertyPlantAndEquipmentNetSummaryOfPropertyPlantAndEquipmentDetails </Role> |
| | | <ShortName> PROPERTY, PLANT AND EQUIPMENT, NET - Summary of Property, Plant and Equipment (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 52 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R53.htm </HtmlFileName> |
| | | <LongName> 40702 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET - Summary of Property, Plant and Equipment by Geographic Area (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosurePropertyPlantAndEquipmentNetSummaryOfPropertyPlantAndEquipmentByGeographicAreaDetails </Role> |
| | | <ShortName> PROPERTY, PLANT AND EQUIPMENT, NET - Summary of Property, Plant and Equipment by Geographic Area (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 53 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R54.htm </HtmlFileName> |
| | | <LongName> 40703 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET - Depreciation Expense and Cost of Maintenance and Repairs (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosurePropertyPlantAndEquipmentNetDepreciationExpenseAndCostOfMaintenanceAndRepairsDetails </Role> |
| | | <ShortName> PROPERTY, PLANT AND EQUIPMENT, NET - Depreciation Expense and Cost of Maintenance and Repairs (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 54 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R55.htm </HtmlFileName> |
| | | <LongName> 40801 - Disclosure - FINANCING ARRANGEMENTS (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureFinancingArrangementsDetails </Role> |
| | | <ShortName> FINANCING ARRANGEMENTS (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureFinancingArrangements </ParentRole> |
| | | <Position> 55 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R56.htm </HtmlFileName> |
| | | <LongName> 40901 - Disclosure - COMMITMENTS - Leases (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCommitmentsLeasesDetails </Role> |
| | | <ShortName> COMMITMENTS - Leases (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 56 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R57.htm </HtmlFileName> |
| | | <LongName> 40902 - Disclosure - COMMITMENTS - Future minimum lease payments (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCommitmentsFutureMinimumLeasePaymentsDetails </Role> |
| | | <ShortName> COMMITMENTS - Future minimum lease payments (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 57 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R58.htm </HtmlFileName> |
| | | <LongName> 40903 - Disclosure - COMMITMENTS - Warranties (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCommitmentsWarrantiesDetails </Role> |
| | | <ShortName> COMMITMENTS - Warranties (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 58 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R59.htm </HtmlFileName> |
| | | <LongName> 40904 - Disclosure - COMMITMENTS - Employee Benefit Plans (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCommitmentsEmployeeBenefitPlansDetails </Role> |
| | | <ShortName> COMMITMENTS - Employee Benefit Plans (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 59 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R60.htm </HtmlFileName> |
| | | <LongName> 41001 - Disclosure - LEGAL CONTINGENCIES (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureLegalContingenciesDetails </Role> |
| | | <ShortName> LEGAL CONTINGENCIES (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureLegalContingencies </ParentRole> |
| | | <Position> 60 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R61.htm </HtmlFileName> |
| | | <LongName> 41101 - Disclosure - STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureStockBasedCompensationSummaryOfActivityUnderCompanySStockOptionPlansDetails </Role> |
| | | <ShortName> STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 61 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R62.htm </HtmlFileName> |
| | | <LongName> 41102 - Disclosure - STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureStockBasedCompensationSummaryOfChangeInNumberOfNonVestedOptionsToPurchaseSharesOfCommonStockDetails </Role> |
| | | <ShortName> STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 62 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R63.htm </HtmlFileName> |
| | | <LongName> 41103 - Disclosure - STOCK-BASED COMPENSATION - Summary of Change in restricted stock units (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureStockBasedCompensationSummaryOfChangeInRestrictedStockUnitsDetails </Role> |
| | | <ShortName> STOCK-BASED COMPENSATION - Summary of Change in restricted stock units (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 63 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R64.htm </HtmlFileName> |
| | | <LongName> 41104 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureStockBasedCompensationAdditionalInformationDetails </Role> |
| | | <ShortName> STOCK-BASED COMPENSATION - Additional Information (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 64 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R65.htm </HtmlFileName> |
| | | <LongName> 41201 - Disclosure - INCOME TAXES - Components of Company's Income Tax Expense (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesComponentsOfCompanySIncomeTaxExpenseDetails </Role> |
| | | <ShortName> INCOME TAXES - Components of Company's Income Tax Expense (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 65 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R66.htm </HtmlFileName> |
| | | <LongName> 41202 - Disclosure - INCOME TAXES - Income Tax Expense Reconciliation (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesIncomeTaxExpenseReconciliationDetails </Role> |
| | | <ShortName> INCOME TAXES - Income Tax Expense Reconciliation (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 66 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R67.htm </HtmlFileName> |
| | | <LongName> 41203 - Disclosure - INCOME TAXES - Net Operating Loss Carryback (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesNetOperatingLossCarrybackDetails </Role> |
| | | <ShortName> INCOME TAXES - Net Operating Loss Carryback (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 67 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R68.htm </HtmlFileName> |
| | | <LongName> 41204 - Disclosure - INCOME TAXES - Research and Development Tax Credits (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesResearchAndDevelopmentTaxCreditsDetails </Role> |
| | | <ShortName> INCOME TAXES - Research and Development Tax Credits (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 68 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R69.htm </HtmlFileName> |
| | | <LongName> 41205 - Disclosure - INCOME TAXES - Unrecognized Income Tax Benefits (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesUnrecognizedIncomeTaxBenefitsDetails </Role> |
| | | <ShortName> INCOME TAXES - Unrecognized Income Tax Benefits (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 69 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R70.htm </HtmlFileName> |
| | | <LongName> 41206 - Disclosure - INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesScheduleOfTaxEffectsOfTemporaryDifferencesThatGaveRiseToDeferredTaxAssetsDetails </Role> |
| | | <ShortName> INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 70 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R71.htm </HtmlFileName> |
| | | <LongName> 41207 - Disclosure - INCOME TAXES - Solar Energy Projects And Supplemental Cash Flow Information (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureIncomeTaxesSolarEnergyProjectsAndSupplementalCashFlowInformationDetails </Role> |
| | | <ShortName> INCOME TAXES - Solar Energy Projects And Supplemental Cash Flow Information (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 71 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R72.htm </HtmlFileName> |
| | | <LongName> 41301 - Disclosure - NET INCOME PER SHARE (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureNetIncomePerShareDetails </Role> |
| | | <ShortName> NET INCOME PER SHARE (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureNetIncomePerShareTables </ParentRole> |
| | | <Position> 72 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R73.htm </HtmlFileName> |
| | | <LongName> 41302 - Disclosure - NET INCOME PER SHARE - Additional information (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureNetIncomePerShareAdditionalInformationDetails </Role> |
| | | <ShortName> NET INCOME PER SHARE - Additional information (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 73 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R74.htm </HtmlFileName> |
| | | <LongName> 41401 - Disclosure - CASH DIVIDENDS AND COMMON STOCK REPURCHASES (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCashDividendsAndCommonStockRepurchasesDetails </Role> |
| | | <ShortName> CASH DIVIDENDS AND COMMON STOCK REPURCHASES (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureCashDividendsAndCommonStockRepurchases </ParentRole> |
| | | <Position> 74 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R75.htm </HtmlFileName> |
| | | <LongName> 41501 - Disclosure - VARIABLE INTEREST ENTITY (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureVariableInterestEntityDetails </Role> |
| | | <ShortName> VARIABLE INTEREST ENTITY (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureVariableInterestEntity </ParentRole> |
| | | <Position> 75 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R76.htm </HtmlFileName> |
| | | <LongName> 41601 - Disclosure - CUSTOMER CONCENTRATIONS (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureCustomerConcentrationsDetails </Role> |
| | | <ShortName> CUSTOMER CONCENTRATIONS (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureCustomerConcentrations </ParentRole> |
| | | <Position> 76 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R77.htm </HtmlFileName> |
| | | <LongName> 41701 - Disclosure - SEGMENT REPORTING (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSegmentReportingDetails </Role> |
| | | <ShortName> SEGMENT REPORTING (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureSegmentReportingTables </ParentRole> |
| | | <Position> 77 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R78.htm </HtmlFileName> |
| | | <LongName> 41801 - Disclosure - SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Other Current Assets (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSupplementalFinancialStatementInformationOtherCurrentAssetsDetails </Role> |
| | | <ShortName> SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Other Current Assets (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 78 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R79.htm </HtmlFileName> |
| | | <LongName> 41802 - Disclosure - SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Accrued Expenses (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSupplementalFinancialStatementInformationAccruedExpensesDetails </Role> |
| | | <ShortName> SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Accrued Expenses (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 79 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R80.htm </HtmlFileName> |
| | | <LongName> 41803 - Disclosure - SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Additional Information (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSupplementalFinancialStatementInformationAdditionalInformationDetails </Role> |
| | | <ShortName> SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Additional Information (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 80 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R81.htm </HtmlFileName> |
| | | <LongName> 41901 - Disclosure - SUBSEQUENT EVENTS (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.arganinc.com/role/DisclosureSubsequentEventsDetails </Role> |
| | | <ShortName> SUBSEQUENT EVENTS (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.arganinc.com/role/DisclosureSubsequentEvents </ParentRole> |
| | | <Position> 81 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R82.htm </HtmlFileName> |
| | | <LongName> 995410 - Disclosure - Pay vs Performance Disclosure </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://xbrl.sec.gov/ecd/role/PvpDisclosure </Role> |
| | | <ShortName> Pay vs Performance Disclosure </ShortName> |
| | | <MenuCategory> Uncategorized </MenuCategory> |
| | | <Position> 82 </Position> |
| | | </Report> |
| | <Report instance="agx-20240131x10k.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R83.htm </HtmlFileName> |
| | | <LongName> 995445 - Disclosure - Insider Trading Arrangements </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements </Role> |
| | | <ShortName> Insider Trading Arrangements </ShortName> |
| | | <MenuCategory> Cover </MenuCategory> |
| | | <Position> 83 </Position> |
| | | </Report> |
| | <Report> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <LongName> All Reports </LongName> |
| | | <ReportType> Book </ReportType> |
| | | <ShortName> All Reports </ShortName> |
| | | </Report> |
| | </MyReports> |
| <Logs> |
| | <Log type="Warning"> [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 13 fact(s) appearing in ix:hidden were eligible for transformation: agx:DefineContributionPlanDeferredPeriod, agx:PeriodOfAmortizationOfGoodwillForIncomeTaxPurpose, agx:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeriodForMonthlyClosingPrices, agx:WarrantyPeriodForConstructionContracts, dei:EntityRegistrantName, us-gaap:CommonStockSharesIssued, us-gaap:DebtSecuritiesAvailableForSaleTerm, us-gaap:PreferredStockSharesOutstanding, us-gaap:PropertyPlantAndEquipmentUsefulLife, us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1, us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage, us-gaap:StockRepurchasedDuringPeriodValue - agx-20240131x10k.htm 9 </Log> |
| | <Log type="Warning"> [ix-0514-Hidden-Fact-Not-Referenced] WARN: 4 fact(s) appearing in ix:hidden were not referenced by any -sec-ix-hidden style property: us-gaap:CommitmentsAndContingencies, us-gaap:OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList - agx-20240131x10k.htm 9 </Log> |
| | <Log type="Warning"> [dq-0712-Presentation-Base-Set-Order] Role '41901 - Disclosure - SUBSEQUENT EVENTS (Details)', a level 4, Detail role, appears before '995410 - Disclosure - Pay vs Performance Disclosure', a level 1, Note role. agx-20240131.xsd 459, https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd 30 </Log> |
| | </Logs> |
| <InputFiles> |
| | <File> agx-20240131.xsd </File> |
| | <File> agx-20240131_cal.xml </File> |
| | <File> agx-20240131_def.xml </File> |
| | <File> agx-20240131_lab.xml </File> |
| | <File> agx-20240131_pre.xml </File> |
| | <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="agx-20240131x10k.htm"> agx-20240131x10k.htm </File> |
| | </InputFiles> |
| <SupplementalFiles> |
| | <File> agx-20240131x10k001.jpg </File> |
| | <File> agx-20240131x10k002.jpg </File> |
| | </SupplementalFiles> |
| <BaseTaxonomies> |
| | <BaseTaxonomy items="975"> http://fasb.org/us-gaap/2023 </BaseTaxonomy> |
| | <BaseTaxonomy items="38"> http://xbrl.sec.gov/dei/2023 </BaseTaxonomy> |
| | <BaseTaxonomy items="4"> http://xbrl.sec.gov/ecd/2023 </BaseTaxonomy> |
| | </BaseTaxonomies> |
| <HasPresentationLinkbase> true </HasPresentationLinkbase> |
| <HasCalculationLinkbase> true </HasCalculationLinkbase> |
| </FilingSummary> |