3.25.0.1 html 306 255 1 true 71 0 false 5 false false R1.htm 0000001 - Document - Cover Page Sheet http://www.arm.com/role/CoverPage Cover Page Cover 1 false false R2.htm 9952151 - Statement - Condensed Consolidated Income Statements Sheet http://www.arm.com/role/CondensedConsolidatedIncomeStatements Condensed Consolidated Income Statements Statements 2 false false R3.htm 9952152 - Statement - Condensed Consolidated Statements of Comprehensive Income Sheet http://www.arm.com/role/CondensedConsolidatedStatementsofComprehensiveIncome Condensed Consolidated Statements of Comprehensive Income Statements 3 false false R4.htm 9952153 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.arm.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 4 false false R5.htm 9952154 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.arm.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 5 false false R6.htm 9952155 - Statement - Condensed Consolidated Statements of Shareholders' Equity Sheet http://www.arm.com/role/CondensedConsolidatedStatementsofShareholdersEquity Condensed Consolidated Statements of Shareholders' Equity Statements 6 false false R7.htm 9952156 - Statement - Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) Sheet http://www.arm.com/role/CondensedConsolidatedStatementsofShareholdersEquityParenthetical Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) Statements 7 false false R8.htm 9952157 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.arm.com/role/CondensedConsolidatedStatementsofCashFlows Condensed Consolidated Statements of Cash Flows Statements 8 false false R9.htm 9952158 - Disclosure - Description of Business and Summary of Significant Accounting Policies Sheet http://www.arm.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPolicies Description of Business and Summary of Significant Accounting Policies Notes 9 false false R10.htm 9952159 - Disclosure - Balance Sheet Components Sheet http://www.arm.com/role/BalanceSheetComponents Balance Sheet Components Notes 10 false false R11.htm 9952160 - Disclosure - Revenue Sheet http://www.arm.com/role/Revenue Revenue Notes 11 false false R12.htm 9952161 - Disclosure - Equity Investments Sheet http://www.arm.com/role/EquityInvestments Equity Investments Notes 12 false false R13.htm 9952162 - Disclosure - Financial Instruments Sheet http://www.arm.com/role/FinancialInstruments Financial Instruments Notes 13 false false R14.htm 9952163 - Disclosure - Derivatives Sheet http://www.arm.com/role/Derivatives Derivatives Notes 14 false false R15.htm 9952164 - Disclosure - Fair Value Sheet http://www.arm.com/role/FairValue Fair Value Notes 15 false false R16.htm 9952165 - Disclosure - Shareholders' Equity Sheet http://www.arm.com/role/ShareholdersEquity Shareholders' Equity Notes 16 false false R17.htm 9952166 - Disclosure - Share-based Compensation Sheet http://www.arm.com/role/SharebasedCompensation Share-based Compensation Notes 17 false false R18.htm 9952167 - Disclosure - Income Taxes Sheet http://www.arm.com/role/IncomeTaxes Income Taxes Notes 18 false false R19.htm 9952168 - Disclosure - Net Income (Loss) Per Share Sheet http://www.arm.com/role/NetIncomeLossPerShare Net Income (Loss) Per Share Notes 19 false false R20.htm 9952169 - Disclosure - Commitments and Contingencies Sheet http://www.arm.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 20 false false R21.htm 9952170 - Disclosure - Related Party Transactions Sheet http://www.arm.com/role/RelatedPartyTransactions Related Party Transactions Notes 21 false false R22.htm 9955511 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Policies) Sheet http://www.arm.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies Description of Business and Summary of Significant Accounting Policies (Policies) Policies http://www.arm.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPolicies 22 false false R23.htm 9955512 - Disclosure - Balance Sheet Components (Tables) Sheet http://www.arm.com/role/BalanceSheetComponentsTables Balance Sheet Components (Tables) Tables http://www.arm.com/role/BalanceSheetComponents 23 false false R24.htm 9955513 - Disclosure - Revenue (Tables) Sheet http://www.arm.com/role/RevenueTables Revenue (Tables) Tables http://www.arm.com/role/Revenue 24 false false R25.htm 9955514 - Disclosure - Equity Investments (Tables) Sheet http://www.arm.com/role/EquityInvestmentsTables Equity Investments (Tables) Tables http://www.arm.com/role/EquityInvestments 25 false false R26.htm 9955515 - Disclosure - Financial Instruments (Tables) Sheet http://www.arm.com/role/FinancialInstrumentsTables Financial Instruments (Tables) Tables http://www.arm.com/role/FinancialInstruments 26 false false R27.htm 9955516 - Disclosure - Derivatives (Tables) Sheet http://www.arm.com/role/DerivativesTables Derivatives (Tables) Tables http://www.arm.com/role/Derivatives 27 false false R28.htm 9955517 - Disclosure - Fair Value (Tables) Sheet http://www.arm.com/role/FairValueTables Fair Value (Tables) Tables http://www.arm.com/role/FairValue 28 false false R29.htm 9955518 - Disclosure - Share-based Compensation (Tables) Sheet http://www.arm.com/role/SharebasedCompensationTables Share-based Compensation (Tables) Tables http://www.arm.com/role/SharebasedCompensation 29 false false R30.htm 9955519 - Disclosure - Net Income (Loss) Per Share (Tables) Sheet http://www.arm.com/role/NetIncomeLossPerShareTables Net Income (Loss) Per Share (Tables) Tables http://www.arm.com/role/NetIncomeLossPerShare 30 false false R31.htm 9955520 - Disclosure - Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) Sheet http://www.arm.com/role/BalanceSheetComponentsScheduleofPrepaidExpensesandOtherCurrentAssetsDetails Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) Details 31 false false R32.htm 9955521 - Disclosure - Balance Sheet Components - Schedule of Accrued Compensation and Benefits and Share-based Compensation (Details) Sheet http://www.arm.com/role/BalanceSheetComponentsScheduleofAccruedCompensationandBenefitsandSharebasedCompensationDetails Balance Sheet Components - Schedule of Accrued Compensation and Benefits and Share-based Compensation (Details) Details 32 false false R33.htm 9955522 - Disclosure - Balance Sheet Components - Schedule of Other Current Liabilities (Details) Sheet http://www.arm.com/role/BalanceSheetComponentsScheduleofOtherCurrentLiabilitiesDetails Balance Sheet Components - Schedule of Other Current Liabilities (Details) Details 33 false false R34.htm 9955523 - Disclosure - Revenue - Schedule of Disaggregation of Revenue (Details) Sheet http://www.arm.com/role/RevenueScheduleofDisaggregationofRevenueDetails Revenue - Schedule of Disaggregation of Revenue (Details) Details 34 false false R35.htm 9955524 - Disclosure - Revenue - Schedule of Revenue by Geographical Location (Details) Sheet http://www.arm.com/role/RevenueScheduleofRevenuebyGeographicalLocationDetails Revenue - Schedule of Revenue by Geographical Location (Details) Details 35 false false R36.htm 9955525 - Disclosure - Revenue - Schedule of Accounts Receivable (Details) Sheet http://www.arm.com/role/RevenueScheduleofAccountsReceivableDetails Revenue - Schedule of Accounts Receivable (Details) Details 36 false false R37.htm 9955526 - Disclosure - Revenue - Schedule of Accounts Receivable, Credit Loss (Details) Sheet http://www.arm.com/role/RevenueScheduleofAccountsReceivableCreditLossDetails Revenue - Schedule of Accounts Receivable, Credit Loss (Details) Details 37 false false R38.htm 9955527 - Disclosure - Revenue - Narrative (Details) Sheet http://www.arm.com/role/RevenueNarrativeDetails Revenue - Narrative (Details) Details 38 false false R39.htm 9955528 - Disclosure - Revenue - Schedule of Contract Liabilities (Details) Sheet http://www.arm.com/role/RevenueScheduleofContractLiabilitiesDetails Revenue - Schedule of Contract Liabilities (Details) Details 39 false false R40.htm 9955529 - Disclosure - Revenue - Remaining Performance Obligations (Details) Sheet http://www.arm.com/role/RevenueRemainingPerformanceObligationsDetails Revenue - Remaining Performance Obligations (Details) Details 40 false false R41.htm 9955530 - Disclosure - Equity Investments - Schedule of Equity Investments (Details) Sheet http://www.arm.com/role/EquityInvestmentsScheduleofEquityInvestmentsDetails Equity Investments - Schedule of Equity Investments (Details) Details 41 false false R42.htm 9955531 - Disclosure - Equity Investments - Schedule of Income (Loss) from Equity Investments (Details) Sheet http://www.arm.com/role/EquityInvestmentsScheduleofIncomeLossfromEquityInvestmentsDetails Equity Investments - Schedule of Income (Loss) from Equity Investments (Details) Details 42 false false R43.htm 9955532 - Disclosure - Equity Investments - Narrative (Details) Sheet http://www.arm.com/role/EquityInvestmentsNarrativeDetails Equity Investments - Narrative (Details) Details 43 false false R44.htm 9955533 - Disclosure - Equity Investments - Schedule of Gains (Losses) on Non-Marketable Securities (Details) Sheet http://www.arm.com/role/EquityInvestmentsScheduleofGainsLossesonNonMarketableSecuritiesDetails Equity Investments - Schedule of Gains (Losses) on Non-Marketable Securities (Details) Details 44 false false R45.htm 9955534 - Disclosure - Financial Instruments - Schedule of Loans and Other Receivables Carried at Amortized Cost (Details) Sheet http://www.arm.com/role/FinancialInstrumentsScheduleofLoansandOtherReceivablesCarriedatAmortizedCostDetails Financial Instruments - Schedule of Loans and Other Receivables Carried at Amortized Cost (Details) Details 45 false false R46.htm 9955535 - Disclosure - Financial Instruments - Narrative (Details) Sheet http://www.arm.com/role/FinancialInstrumentsNarrativeDetails Financial Instruments - Narrative (Details) Details 46 false false R47.htm 9955536 - Disclosure - Derivatives - Narrative (Details) Sheet http://www.arm.com/role/DerivativesNarrativeDetails Derivatives - Narrative (Details) Details 47 false false R48.htm 9955537 - Disclosure - Derivatives - Schedule of Derivative Instruments (Details) Sheet http://www.arm.com/role/DerivativesScheduleofDerivativeInstrumentsDetails Derivatives - Schedule of Derivative Instruments (Details) Details 48 false false R49.htm 9955538 - Disclosure - Derivatives - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) Sheet http://www.arm.com/role/DerivativesScheduleofDerivativeInstrumentsinStatementofFinancialPositionFairValueDetails Derivatives - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) Details 49 false false R50.htm 9955539 - Disclosure - Derivatives - Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) Sheet http://www.arm.com/role/DerivativesScheduleofCashFlowHedgingInstrumentsStatementsofFinancialPerformanceandFinancialPositionLocationDetails Derivatives - Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) Details 50 false false R51.htm 9955540 - Disclosure - Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) Sheet http://www.arm.com/role/FairValueScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) Details 51 false false R52.htm 9955541 - Disclosure - Fair Value - Schedule of Changes in Fair Value of Level 3 Financial Assets and Liabilities (Details) Sheet http://www.arm.com/role/FairValueScheduleofChangesinFairValueofLevel3FinancialAssetsandLiabilitiesDetails Fair Value - Schedule of Changes in Fair Value of Level 3 Financial Assets and Liabilities (Details) Details 52 false false R53.htm 9955542 - Disclosure - Fair Value - Schedule of Equity Method Investments Key Assumptions (Details) Sheet http://www.arm.com/role/FairValueScheduleofEquityMethodInvestmentsKeyAssumptionsDetails Fair Value - Schedule of Equity Method Investments Key Assumptions (Details) Details 53 false false R54.htm 9955543 - Disclosure - Fair Value - Narrative (Details) Sheet http://www.arm.com/role/FairValueNarrativeDetails Fair Value - Narrative (Details) Details 54 false false R55.htm 9955544 - Disclosure - Shareholders' Equity (Details) Sheet http://www.arm.com/role/ShareholdersEquityDetails Shareholders' Equity (Details) Details http://www.arm.com/role/ShareholdersEquity 55 false false R56.htm 9955545 - Disclosure - Share-based Compensation - Narrative (Details) Sheet http://www.arm.com/role/SharebasedCompensationNarrativeDetails Share-based Compensation - Narrative (Details) Details 56 false false R57.htm 9955546 - Disclosure - Share-based Compensation - Schedule of Restricted Stock Unit Activity (Details) Sheet http://www.arm.com/role/SharebasedCompensationScheduleofRestrictedStockUnitActivityDetails Share-based Compensation - Schedule of Restricted Stock Unit Activity (Details) Details 57 false false R58.htm 9955547 - Disclosure - Share-based Compensation - Schedule of Omnibus Incentive Plan (Details) Sheet http://www.arm.com/role/SharebasedCompensationScheduleofOmnibusIncentivePlanDetails Share-based Compensation - Schedule of Omnibus Incentive Plan (Details) Details 58 false false R59.htm 9955548 - Disclosure - Share-based Compensation - Schedule of Share-Based Compensation Expense (Details) Sheet http://www.arm.com/role/SharebasedCompensationScheduleofShareBasedCompensationExpenseDetails Share-based Compensation - Schedule of Share-Based Compensation Expense (Details) Details 59 false false R60.htm 9955549 - Disclosure - Income Taxes (Details) Sheet http://www.arm.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://www.arm.com/role/IncomeTaxes 60 false false R61.htm 9955550 - Disclosure - Net Income (Loss) Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) Sheet http://www.arm.com/role/NetIncomeLossPerShareScheduleofBasicandDilutedEarningsPerShareDetails Net Income (Loss) Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) Details http://www.arm.com/role/NetIncomeLossPerShareTables 61 false false R62.htm 9955551 - Disclosure - Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) Sheet http://www.arm.com/role/NetIncomeLossPerShareScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) Details http://www.arm.com/role/NetIncomeLossPerShareTables 62 false false R63.htm 9955552 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.arm.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.arm.com/role/CommitmentsandContingencies 63 false false R64.htm 9955553 - Disclosure - Related Party Transactions (Details) Sheet http://www.arm.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://www.arm.com/role/RelatedPartyTransactions 64 false false All Reports Book All Reports arm-20241231.htm arm-20241231.xsd arm-20241231_cal.xml arm-20241231_def.xml arm-20241231_lab.xml arm-20241231_pre.xml http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/dei/2024 true true