Other countries Other Countries [Member] Other Countries Deferred income taxes Deferred Income Taxes and Tax Credits Over-Allotment Option Over-Allotment Option [Member] Equity method investments, fair value option, measurement input Equity Method Investments, Fair Value Option, Measurement Input Equity Method Investments, Fair Value Option, Measurement Input Related party transaction, term Related Party Transaction, Term Related Party Transaction, Term Cerfe Labs, Inc. Cerfe Labs, Inc. [Member] Cerfe Labs, Inc. Schedule of Accrued Compensation and Benefits and Share-based Compensation Schedule of Accrued Liabilities [Table Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Research and development Research and Development Expense Related Party Transaction [Line Items] Related Party Transaction [Line Items] All Award Types Award Type [Domain] Investment, Name [Domain] Investment, Name [Domain] Remaining performance obligation, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Outstanding (in shares) Outstanding, beginning of period (in shares) Outstanding, ending of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Statement of Stockholders' Equity [Abstract] Executive Awards Executive Awards [Member] Executive Awards Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Deferred tax liabilities Deferred Income Tax Liabilities, Net Performance Shares Performance Shares [Member] Converted into equity Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Investment, Name [Axis] Investment, Name [Axis] Derivatives Not Designated as Hedging Instruments Derivatives Not Designated as Hedging Instruments [Table Text Block] Fair value of financial assets at the beginning of the period Fair value at the end of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value LTM Revenue Multiple Measurement Input, Revenue Multiple [Member] Non-cash additions in property and equipment Non-Cash Changes In Property, Plant And Equipment Non-Cash Changes In Property, Plant And Equipment Commitments and contingencies (Note 12) Commitments and Contingencies Ampere Ampere Computing Holdings LLC [Member] Ampere Computing Holdings LLC Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Shareholders' Equity Equity [Text Block] Geographical [Axis] Geographical [Axis] Service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Income Taxes Income Tax Disclosure [Text Block] Contract liabilities (including contract liabilities from related parties) Increase (Decrease) in Contract with Customer, Liability Ownership [Axis] Ownership [Axis] Customer [Axis] Customer [Axis] Current liabilities: Liabilities, Current [Abstract] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Weighted Average Grant Date Fair Value Per RSU Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Net income per ordinary share - diluted (in USD per share) Earnings Per Share, Diluted Hedging Relationship [Axis] Hedging Relationship [Axis] Accounts receivable, net (including receivables from related parties of $217 and $402 as of December 31, 2023 and March 31, 2023, respectively) Accounts receivable, net Total accounts receivables, net Accounts Receivable, after Allowance for Credit Loss, Current 2019 EIP Executive IPO Plan [Member] Executive IPO Plan Receivable [Domain] Receivable [Domain] Proceeds from equity method investments Proceeds From Equity Method Investments Proceeds From Equity Method Investments Net change of the effective portion of designated cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Level 3 Fair Value, Inputs, Level 3 [Member] Non-current assets: Assets, Noncurrent [Abstract] Accelerated share-based compensation Share-Based Payment Arrangement, Accelerated Cost Loans and Other Receivables Carried at Amortized Cost Financing Receivable, Allowance for Credit Loss [Table Text Block] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Net income (loss) Net income (loss) Net income Net Income (Loss) Total current liabilities Liabilities, Current Fair Value Disclosures [Abstract] Electronic design automation liabilities Electronic Design Automation Liabilities, Current Electronic Design Automation Liabilities, Current Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Shareholders’ equity: Equity, Attributable to Parent [Abstract] Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Beginning balance Ending balance Contract with Customer, Liability Subscription costs incurred Costs Incurred, Subscription Costs Costs Incurred, Subscription Costs Gains (losses) recognized in Accumulated other comprehensive income on cash flow hedge derivatives Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Impairment of non-marketable equity securities Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Amounts of transaction Related Party Transaction, Amounts of Transaction Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Kigen (UK) Limited Kigen (UK) Limited [Member] Kigen (UK) Limited Accrued bonus, commissions, and cash awards Accured Bonus, Commissions, And Cash Awards, Current Accured Bonus, Commissions, And Cash Awards, Current Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Financial Liabilities Fair Value Disclosure [Abstract] Financial Liabilities Fair Value Disclosure [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Contract With Customers, Liability [Roll Forward] Contract With Customers, Liability [Roll Forward] Contract With Customers, Liability Guarantor obligation Guarantor Obligations, Maximum Exposure, Undiscounted Purchase of short-term investments Payments to Acquire Short-Term Investments Goodwill Goodwill Equity Components [Axis] Equity Components [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Remaining Performance Obligation, Type [Axis] Remaining Performance Obligation, Type [Axis] Remaining Performance Obligation, Type Accounts receivable, net (including receivables from related parties) Increase (Decrease) in Accounts Receivable Forecast Forecast [Member] Selling, general and administrative expenses Selling, General and Administrative Expenses [Member] Derivative, notional amount Derivative, Notional Amount Accounts Receivable Accounts Receivable [Member] Point-in-time revenues Transferred at Point in Time [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Non-current portion of operating lease liabilities Operating Lease, Liability, Noncurrent Proceeds from maturity of short-term investments Proceeds from Sale, Maturity and Collection of Short-Term Investments Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] 2019 AEP Arm Limited All Employee Plan 2019 [Member] Arm Limited All Employee Plan 2019 Purchases of equity investments Payments to acquire non-marketable preferred stock Payments to Acquire Long-Term Investments Income Statement Location [Axis] Income Statement Location [Axis] Tax withholding on vested shares from share-based payment arrangements Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Non-cash distributions to shareholders Non-cash Distributions To Shareholders Non-cash Distributions To Shareholders Largest Customer Largest Customer [Member] Largest Customer Shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Changes in assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Product and Service [Domain] Product and Service [Domain] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Contract assets (including contract assets from related parties of $16 and $9 as of December 31, 2023 and March 31, 2023, respectively) Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Research and development Research and Development Expense [Member] Cash flows provided by (used for) investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Derivative Instruments and Hedging Activities Disclosure [Abstract] Award Type Award Type [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Plan Name [Domain] Plan Name [Domain] Unrecognized share-based compensation Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Hedging Designation [Axis] Hedging Designation [Axis] Non-cash additions in operating lease right of use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Related Party Transactions Related Party Transactions Disclosure [Text Block] Performance obligation satisfied in previous period Contract with Customer, Performance Obligation Satisfied in Previous Period Use of Estimates Use of Estimates, Policy [Policy Text Block] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Non-cash withholding tax on vested shares Non-cash Withholding Tax On Vested Shares Non-cash Withholding Tax On Vested Shares Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Observable price adjustments on non-marketable equity securities (includes NAV) Equity Securities Without Readily Determinable Fair Value, Including Fair Value Option, Price Adjustment, Annual Amount Equity Securities Without Readily Determinable Fair Value, Including Fair Value Option, Price Adjustment, Annual Amount Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Operating lease liabilities Operating Lease, Liability, Current Financial Standby Letter of Credit Financial Standby Letter of Credit [Member] Reclassification, Type [Domain] Reclassification, Type [Domain] Equity investments (including investments held at fair value of $576 and $592 as of December 31, 2023 and March 31, 2023, respectively) Total equity investments Long-Term Investments Other receivables Other Loan [Member] Other Loan Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Tax liabilities Increase (Decrease) in Income Taxes Payable Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Counterparty Name [Domain] Counterparty Name [Domain] Other liabilities (including payables to related parties) Increase (Decrease) in Other Operating Liabilities Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Restricted Stock Units, Time-Based Restricted Stock Units, Time-Based [Member] Restricted Stock Units, Time-Based Total gross receivables Accounts Receivable, before Allowance for Credit Loss Remaining Performance Obligation, Type [Domain] Remaining Performance Obligation, Type [Domain] Remaining Performance Obligation, Type [Domain] Sale of stock (in dollars per share) Sale of Stock, Price Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Gross profit Gross Profit Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Contract liabilities (including contract liabilities from related parties of $100 and $135 as of December 31, 2023 and March 31, 2023, respectively) Contract liabilities Current Contract Liabilities Current portion of contract liabilities Contract with Customer, Liability, Current Total financial assets Assets, Fair Value Disclosure Selling, general and administrative Selling, General and Administrative Expense Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Vesting Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Description of Business and Summary of Significant Accounting Policies Business Description and Accounting Policies [Text Block] Unrecognized share-based compensation, recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Other financing activities, net Proceeds from (Payments for) Other Financing Activities Maximum Maximum [Member] Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Document Type Document Type Customer prepayment and billing in advance of performance Contract With Customer, Liability, Prepayment And Billing Contract With Customer, Liability, Prepayment And Billing Employee related payroll taxes and payables Accrued Payroll Taxes, Current Receivable Type [Axis] Receivable Type [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Royalty receivables Royalty Accounts Receivable [Member] Royalty Accounts Receivable Realized Gain (Loss) on Investments Realized Gain (Loss) on Investments [Table Text Block] Share-based Compensation Share-Based Payment Arrangement [Text Block] Ownership percentage Subsidiary, Ownership Percentage, Parent Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other non-cash operating activities, net Other Noncash Income (Expense) Non-cash reclassification of share-based compensation costs Non-cash Reclassification Of Share-Based Compensation Costs Non-cash Reclassification Of Share-Based Compensation Costs Tax liabilities Taxes Payable, Current Derivative, fair value Derivative, Fair Value, Net Remaining performance obligation, percent Revenue, Remaining Performance Obligation, Percentage Allowance for current expected credit losses Accounts Receivable, Allowance for Credit Loss, Current Customer Concentration Risk Customer Concentration Risk [Member] Other current liabilities (including payables to related parties of $25 and $17 as of December 31, 2023 and March 31, 2023, respectively) Other current liabilities Total other current liabilities Other Liabilities, Current Income Statement [Abstract] Linaro Agreement Linaro Agreement [Member] Linaro Agreement Contract assets, net (including contract assets from related parties) Increase (Decrease) in Contract with Customer, Asset Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Related Party, Type [Domain] Related Party, Type [Domain] Derivative Liabilities Foreign currency forward contracts Derivative Liability Non-cash additions in intangible assets Non-Cash Changes In Intangible Assets Non-Cash Changes In Intangible Assets Outstanding (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Equity method investments under equity method Equity Method Investments, Excluding Fair Value Option Equity Method Investments, Excluding Fair Value Option Income Tax Disclosure [Abstract] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Share-Based Payment Arrangement [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Arm China Arm China [Member] Arm China Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Performance Shares, Continuous Service And Performance Conditions Performance Shares, Continuous Service And Performance Conditions [Member] Performance Shares, Continuous Service And Performance Conditions Non-cash operating, investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Contract termination costs Gain (Loss) on Contract Termination Retained earnings Retained Earnings (Accumulated Deficit) Commitments and Contingencies Disclosure [Abstract] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Current assets: Assets, Current [Abstract] Restricted Stock Units, Launch Awards Restricted Stock Units, Launch Awards [Member] Restricted Stock Units, Launch Awards Omnibus Incentive Plan Omnibus Incentive Plan [Member] Omnibus Incentive Plan Acetone Limited Acetone Limited [Member] Acetone Limited Counterparty Name [Axis] Counterparty Name [Axis] Derivative Financial Instruments and Hedge Activities and Currency Exchange Contracts Derivatives, Policy [Policy Text Block] Cash flows provided by (used for) operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] IPO IPO [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Basic (in USD per share) Income (Loss) from Continuing Operations, Per Basic Share Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Common stock, shares, outstanding (in shares) Balances, beginning of period (in shares) Balances, ending of period (in shares) Common Stock, Shares, Outstanding Non-cash distribution, disposal of investment Non-Cash Distribution, Disposal Of Investment Non-Cash Distribution, Disposal Of Investment Other receivables Other Receivables Total non-current assets Assets, Noncurrent Non-current portion of contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Asset Class [Domain] Asset Class [Domain] SoftBank Vision Fund SoftBank Vision Fund [Member] SoftBank Vision Fund Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Sale of Stock [Axis] Sale of Stock [Axis] Foreign currency translation adjustments Foreign currency translation adjustments, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Payment of intangible asset obligations Repayments Of Intangible Asset Obligation Repayments Of Intangible Asset Obligation Weighted average grant date fair value per RSU, expected to vest (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Weighted Average Grant Date Fair Value Net cash provided by (used for) investing activities Net Cash Provided by (Used in) Investing Activities Customer [Domain] Customer [Domain] (Gains) losses reclassified from Accumulated other comprehensive income into income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Allia Limited Allia Limited [Member] Allia Limited Income tax expense as a percentage of income before taxes Effective Income Tax Rate Reconciliation, Percent Measurement Input Type [Domain] Measurement Input Type [Domain] Tax benefit (expense) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Liabilities Liabilities Measurement Input, Probability Of IPO, Time To Future Exit Scenario Measurement Input, Probability Of IPO, Time To Future Exit Scenario [Member] Measurement Input, Probability Of IPO, Time To Future Exit Scenario Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Reclassification, Other Noncurrent Liabilities Reclassification, Other Noncurrent Liabilities [Member] Reclassification, Other Noncurrent Liabilities Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Loss contingency accrual reversal Loss Contingency Accrual, Period Increase (Decrease) Measurement Frequency [Domain] Measurement Frequency [Domain] Non-current portion of contract liabilities Non-Current Contract Liabilities Non-current portion of contract liabilities Contract with Customer, Liability, Noncurrent Non-current liabilities: Liabilities, Noncurrent [Abstract] Plan Name [Axis] Plan Name [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Share-based compensation, tax benefit (expense) Share-Based Payment Arrangement, Expense, Tax Benefit Net income (loss) per share attributable to ordinary shareholders Earnings Per Share [Abstract] Awards Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Reclassification, Type [Axis] Reclassification, Type [Axis] Ordinary shares, $0.001 par value; 1,088,334,144 shares authorized and 1,028,075,347 shares issued and outstanding as of December 31, 2023; and 1,025,234,000 shares authorized, issued and outstanding as of March 31, 2023 Common Stock, Value, Issued PRC CHINA Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] IoTP Pelion IOT Limited [Member] Pelion IOT Limited Operating lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Total current assets Assets, Current Proceeds from reimbursement from underwriters Proceeds From Reimbursement From Underwriters Proceeds From Reimbursement From Underwriters Revenue from Contract with Customer [Abstract] Other non-operating income (loss), net Other Nonoperating Income (Expense) Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Allowance for current expected credit losses Impaired loan receivable Financing Receivable, Allowance for Credit Loss Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Trade payables Accounts Payable, Trade, Current Contract assets, transfer to accounts receivable Contract with Customer, Asset, Reclassified to Receivable Restricted Stock Units, Liability-Classified Restricted Stock Units, Liability-Classified [Member] Restricted Stock Units, Liability-Classified Two Largest Customers Two Largest Customers [Member] Two Largest Customers Concentration risk Concentration Risk, Percentage Service Share Arrangement Service Share Arrangement [Member] Service Share Arrangement Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Financial Instruments Financing Receivables [Text Block] Equity Investments Investment [Table Text Block] Net cash provided by (used for) operating activities Net Cash Provided by (Used in) Operating Activities Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Non-cash additions to equity investments from conversion of certain receivables Non-cash Additions To Equity Investments From Conversion Of Certain Receivables Non-cash Additions To Equity Investments From Conversion Of Certain Receivables Accrued salaries and fringe benefits Accrued Salaries, Current Depreciation and amortization Depreciation, Depletion and Amortization Share-based payment liabilities Deferred Compensation Share-Based Arrangements, Liability, Current Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Over-time revenues Transferred over Time [Member] Accrued compensation and benefits and share-based compensation Increase (Decrease) in Employee Related Liabilities Statement of Financial Position [Abstract] Total shareholders’ equity Balance, beginning of period Balance, ending of period Equity, Attributable to Parent Loans and other receivables carried at amortized cost, net Financing Receivable, after Allowance for Credit Loss Distributions to shareholders of the Company Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Revenue recognized in the period that was included in the contract liability balance at the beginning of the period Contract with Customer, Liability, Revenue Recognized Retricted Stock Units, Annual Awards Retricted Stock Units, Annual Awards [Member] Retricted Stock Units, Annual Awards Concentration Risk Type [Axis] Concentration Risk Type [Axis] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-marketable equity securities Equity Securities without Readily Determinable Fair Value, Amount Purchases of intangible assets Payments to Acquire Intangible Assets Expected to vest (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Outstanding, Number Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Outstanding, Number Hedging Designation [Domain] Hedging Designation [Domain] Level 2 Fair Value, Inputs, Level 2 [Member] Valuation Technique, Probability-Weighted, Expected Return Valuation Technique, Probability-Weighted, Expected Return [Member] Valuation Technique, Probability-Weighted, Expected Return Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus Loans receivable Loans Receivable [Member] Share-Based Payment Arrangement, Restricted Stock Units And Performance Shares, Activity Share-Based Payment Arrangement, Restricted Stock Units And Performance Shares, Activity [Table Text Block] Share-Based Payment Arrangement, Restricted Stock Units And Performance Shares, Activity Antidilutive Securities [Axis] Antidilutive Securities [Axis] Share-based compensation cost Share-Based Payment Arrangement, Noncash Expense Share-based awards, liability paid Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Ordinary Shares Common Stock [Member] Reclassification, Other Current Liabilities Reclassification, Other Current Liabilities [Member] Reclassification, Other Current Liabilities Product and Service [Axis] Product and Service [Axis] Net Income (Loss) Per Share Earnings Per Share [Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Royalty Revenue Royalty [Member] Investments, All Other Investments [Abstract] Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Ownership percentage Equity Method Investment, Ownership Percentage Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Executed Awards converted from liability awards (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Converted From Liability Awards, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Converted From Liability Awards, Weighted Average Grant Date Fair Value Non-Cancellable And Non-Refundable Committed Funds Non-Cancellable And Non-Refundable Committed Funds [Member] Non-Cancellable And Non-Refundable Committed Funds Minimum Minimum [Member] Property and equipment, net Property, Plant and Equipment, Net Receivables [Abstract] Other Equity Investments Other Equity Investments [Member] Other Equity Investments Dividends from equity investments Proceeds from Equity Method Investment, Distribution Accrued expenses and fees Accrued Expenses And Fees, Current Accrued Expenses And Fees, Current Foreign currency forward contracts Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Statement of Cash Flows [Abstract] Assets: Assets [Abstract] Total financial liabilities Liabilities, Fair Value Disclosure Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Operating lease liabilities Increase (Decrease) in Operating Lease Liability External Customers Nonrelated Party [Member] Payment of withholding tax on vested shares Payment, Tax Withholding, Share-Based Payment Arrangement Convertible loans receivable Convertible Loans Receivable [Member] Convertible Loans Receivable Liabilities: Liabilities [Abstract] Net cash provided by (used for) financing activities Net Cash Provided by (Used in) Financing Activities Deferred tax assets Deferred Income Tax Assets, Net Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Diluted (in USD per share) Income (Loss) from Continuing Operations, Per Diluted Share Other investing activities, net, including investments in convertible loans Payments for (Proceeds from) Other Investing Activities Common Control in SoftBank Common Control in SoftBank [Member] Common Control in SoftBank Retained Earnings Retained Earnings [Member] Share-Based Payment Arrangement, Expensed and Capitalized, Amount Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Total liabilities and shareholders’ equity Liabilities and Equity Other non-current assets Other non-current assets Other Assets, Noncurrent Ownership [Domain] Ownership [Domain] Net income per ordinary share - basic (in USD per share) Earnings Per Share, Basic Net change of the effective portion of designated cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Operating lease right of use assets Operating Lease, Right-of-Use Asset Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Sale of non-marketable equity securities Equity Securities Without Readily Determinable Fair Value, Including Fair Value Option, Gain (Loss) From Sale Equity Securities Without Readily Determinable Fair Value, Including Fair Value Option, Gain (Loss) From Sale Revenue recognized in the period that was included in the contract liability balance during the period Contract With Customer, Liability, Revenue Recognized, During Period Contract With Customer, Liability, Revenue Recognized, During Period Sale of Stock [Domain] Sale of Stock [Domain] Related Parties Related Party [Member] Principles of Consolidation Consolidation, Policy [Policy Text Block] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Total non-current liabilities Liabilities, Noncurrent Disposal, restructuring and other operating expenses, net Disposal, Restructuring And Other Operating Expenses, Net Disposal, Restructuring And Other Operating Expenses, Net Restricted Stock Units And Performance Shares Restricted Stock Units And Performance Shares [Member] Restricted Stock Units And Performance Shares Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Common stock, shares authorized (in shares) Common Stock, Shares Authorized 2022 RSU Plan 2022 Arm Limited RSU Award Plan [Member] 2022 Arm Limited RSU Award Plan Republic of Korea KOREA, REPUBLIC OF Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Phantom Share Units (PSUs) Phantom Share Units (PSUs) [Member] Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Equity Investments Investment [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Income (loss) from equity investments, net Income (loss) from equity investments, net Total loss from equity investments, net Gain (Loss) on Investments Additional paid-in capital Additional Paid in Capital Condensed Consolidated Statements of Comprehensive Income: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] Derivative Assets Foreign currency forward contracts Derivative Asset Cancelled and forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Convertible loans receivable Convertible promissory note Loans Receivable, Fair Value Disclosure Non-current portion of accrued compensation and share-based compensation Non-current portion of accrued compensation and share-based compensation increase (decrease) Accounts Payable and Accrued Liabilities, Noncurrent Statement of Comprehensive Income [Abstract] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Cancelled and forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Loans and other receivables carried at amortized cost Loan receivable Financing Receivable, before Allowance for Credit Loss Equity Method Investments Equity Method Investments [Policy Text Block] Increase in contract with customer, asset Increase In Contract With Customer, Asset Increase In Contract With Customer, Asset Customer deposits Contract with Customer, Refund Liability Related Party, Type [Axis] Related Party, Type [Axis] Reclassification of RSU awards previously liability-classified Adjustment To Additional Paid In Capital, Share-Based Compensation Liability Reclassified To Equity Adjustment To Additional Paid In Capital, Share-Based Compensation Liability Reclassified To Equity Executed Awards converted from liability awards (in shares) Share-Based Compensation Arrangement By Share-Based Payment Awrd, Equity Instruments Other Than Options, Converted From Liability Awards Share-Based Compensation Arrangement By Share-Based Payment Awrd, Equity Instruments Other Than Options, Converted From Liability Awards Issuance of vested shares from share-based payment arrangements (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Equity-classified awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Non-cash additions of operating lease liabilities Non-Cash Additional Of Operating Lease Liabilities Non-Cash Additional Of Operating Lease Liabilities Cost of sales Cost of Sales [Member] Document Period End Date Document Period End Date Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Entity Central Index Key Entity Central Index Key Loss contingency Loss Contingency Accrual Equity Method Investments, Fair Value Option Equity Method Investments, Fair Value Option [Member] Equity Method Investments, Fair Value Option Fair value losses recognized in the Condensed Consolidated Income Statements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Share-based compensation cost (credit) Share-Based Payment Arrangement, Expense Income tax benefit (expense) Income tax expense Income Tax Expense (Benefit) Designated as Hedging Instrument Designated as Hedging Instrument [Member] Accrued compensation and benefits and share-based compensation Accrued compensation and benefits and share-based compensation increase (decrease) Accrued compensation and benefits and share-based compensation Employee-related Liabilities, Current Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Fair Value Fair Value Disclosures [Text Block] Accrued vacation and sabbatical Accrued Vacation And Sabbatical, Current Accrued Vacation And Sabbatical, Current Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Equity [Abstract] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Entity [Domain] Entity [Domain] Amendment Flag Amendment Flag Shares issued (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Issued In Connection With The IPO Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Issued In Connection With The IPO Legal Entity [Axis] Legal Entity [Axis] Raine Securities LLC Agreement Raine Securities LLC Agreement [Member] Raine Securities LLC Agreement Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Second Largest Customer Second Largest Customer [Member] Second Largest Customer Tax withholding on vested shares (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Number of grantees affected by modification Share-Based Payment Arrangement, Plan Modification, Number of Grantees Affected Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Diluted (in shares) Weighted average ordinary shares used to calculate diluted net income (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Reconciliation of Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Trade receivables Trade Accounts Receivable [Member] Interest income, net Interest Income (Expense), Nonoperating, Net Revenue Revenue from Contract with Customer [Text Block] Weighted average ordinary shares used to calculate basic net income (loss) per share (in shares) Weighted Average Number of Shares Issued, Basic Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Additional Paid- in Capital Additional Paid-in Capital [Member] Total assets Assets Equity method investments Gains (losses) on equity method investments Income (Loss) from Equity Method Investments Restricted Stock Units, Continuous Service Restricted Stock Units, Continuous Service [Member] Restricted Stock Units, Continuous Service Cover [Abstract] Arduino Arduino SA [Member] Arduino SA Share-based compensation cost APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Loan term Financing Receivable, Term Financing Receivable, Term United States UNITED STATES Fair Value, Recurring Fair Value, Recurring [Member] License and Other Revenue License And Other Revenue [Member] License And Other Revenue Distribution to majority ordinary shareholder related to Pelion IOT Limited Equity Distribution To Majority Shareholder For Receivable Equity Distribution To Majority Shareholder For Receivable Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] Equity method investments under fair value option Equity method investments Equity Method Investments, Fair Value Option Equity Method Investments, Fair Value Option Other non-current liabilities Other Liabilities, Noncurrent Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Annual increase in shares authorized Share-Based Compensation Arrangement By Share-Based Payment Award, Annual Increase In Shares Authorized Share-Based Compensation Arrangement By Share-Based Payment Award, Annual Increase In Shares Authorized Remaining performance obligations, amount Revenue, Remaining Performance Obligation, Amount Short-term investments Short-Term Investments Additions, net of contributions from shareholders of the Company Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Cash Flow Hedging Cash Flow Hedging [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Total operating expense Operating expenses Operating Expenses Non-marketable equity securities (includes NAV) (Losses) gains from non-marketable equity securities Total income (loss) from equity investments in non-marketable securities, net Income (Loss) From Equity Securities without Readily Determinable Fair Value, Including Fair Value Option Income (Loss) From Equity Securities without Readily Determinable Fair Value, Including Fair Value Option Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash flows provided by (used for) financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Equity Component [Domain] Equity Component [Domain] Finance lease liabilities Finance Lease, Liability, Current Weighted average ordinary shares outstanding Earnings Per Share, Basic, Other Disclosure [Abstract] Performance Shares, Time Based Performance Shares, Time Based [Member] Performance Shares, Time Based Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Debt Instrument [Line Items] Debt Instrument [Line Items] Scenario [Axis] Scenario [Axis] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Concentration Risk Type [Domain] Concentration Risk Type [Domain] Taiwan TAIWAN Operating income (loss) Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Net receivable Accounts Receivable, After Allowance For Credit Loss, Receivable (Payable), Net, Current Accounts Receivable, After Allowance For Credit Loss, Receivable (Payable), Net, Current Cost of sales Cost of Revenue Related Party Transaction [Axis] Related Party Transaction [Axis] Statement [Line Items] Statement [Line Items] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Scenario [Domain] Scenario [Domain] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Financial commitments to investees, off balance sheet Financial Commitments To Investees, Off Balance Sheet Financial Commitments To Investees, Off Balance Sheet