Other countries Other Countries [Member] Other Countries Proceeds from business divestiture Proceeds from Divestiture of Businesses Accumulated Amortization Total intangible asset, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Short-term Investments Available-For-Sale Debt Securities Investment, Policy [Policy Text Block] Related party transaction, term Related Party Transaction, Term Related Party Transaction, Term Changes in ARO liabilities Asset Retirement Obligation, Period Increase (Decrease) Award Timing Predetermined Award Timing Predetermined [Flag] Share-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Entity File Number Entity File Number Additional Paid- in Capital Additional Paid-in Capital [Member] IPO IPO [Member] Tabular List, Table Tabular List [Table Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Finance leases Finance Lease, Liability [Abstract] Purchases of short-term investments Payments to Acquire Short-Term Investments Guarantor obligation Guarantor Obligations, Maximum Exposure, Undiscounted Research and development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Trading Loss Credit Carryforward Trading Loss Credit Carryforward [Member] Trading Loss Credit Carryforward Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Non-cash additions in property and equipment Non-Cash Changes In Property, Plant And Equipment Non-Cash Changes In Property, Plant And Equipment Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Lease liabilities Deferred Tax Asset, Lease Liability Deferred Tax Asset, Lease Liability Ampere Ampere Computing Holdings LLC [Member] Ampere Computing Holdings LLC Revenue Revenue from Contract with Customer [Text Block] Share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Issuance of ordinary shares under Employee Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Total current tax benefit (expense) Current Income Tax Expense (Benefit) Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk Concentration Risk, Percentage Remaining performance obligation, percent Revenue, Remaining Performance Obligation, Percentage Principles of Consolidation Consolidation, Policy [Policy Text Block] Share-based compensation cost Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Loans and other receivables carried at amortized cost, net Financing Receivable, after Allowance for Credit Loss Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash paid for income taxes, net of refunds Income Taxes Paid Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total shareholders’ equity Balance, beginning of period Balance, ending of period Equity, Attributable to Parent Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Schedule of Property and Equipment Useful Lives Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Discount for lack of marketability Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Discount For Lack Of Marketability Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Discount For Lack Of Marketability Proceeds from equity method investments Proceeds From Equity Method Investments Proceeds From Equity Method Investments Reclassification, Type [Domain] Reclassification, Type [Domain] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] State and Local Jurisdiction State and Local Jurisdiction [Member] Performance Shares, Continuous Service And Relative TSR Performance Shares, Continuous Service And Relative TSR [Member] Performance Shares, Continuous Service And Relative TSR Cover [Abstract] Money market funds Cash and Cash Equivalents, Fair Value Disclosure Acquisitions and Divestitures Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Intangible assets, useful lives Finite-Lived Intangible Asset, Useful Life Net Carrying Value Finite-Lived Intangible Assets, Net Weighted Average Discount Rate Weighted Average Discount Rate [Abstract] Weighted Average Discount Rate Electronic design automation liabilities Electronic Design Automation Liabilities, Current Electronic Design Automation Liabilities, Current Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Award Activity Under the 2022 RSU Plan Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Fixtures and vehicles Fixtures And Vehicles [Member] Fixtures And Vehicles Accrued salaries and fringe benefits Accrued Salaries, Current Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Subscription costs incurred Costs Incurred, Subscription Costs Costs Incurred, Subscription Costs Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-Lived Assets by Geographic Area Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Kigen (UK) Limited Kigen (UK) Limited [Member] Kigen (UK) Limited Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accrued bonus, commissions, and cash awards Accured Bonus, Commissions, And Cash Awards, Current Accured Bonus, Commissions, And Cash Awards, Current Statement of Stockholders' Equity [Abstract] Share based payment arrangement amount capitalized Share-Based Payment Arrangement, Amount Capitalized Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Paid for Income Taxes, Net of Refunds Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Contract With Customers, Liability [Roll Forward] Contract With Customers, Liability [Roll Forward] Contract With Customers, Liability Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Asset Retirement Obligations Asset Retirement Obligation [Policy Text Block] Schedule of Prepaid Expenses and Other Current Assets Schedule of Other Current Assets [Table Text Block] HOPU-ARM Innovation Fund, L.P. —NAV HOPU-ARM Innovation Fund, L.P. [Member] HOPU-ARM Innovation Fund, L.P. Deferred income Deferred Tax Liabilities, Deferred Income Deferred Tax Liabilities, Deferred Income United Kingdom Income (Loss) from Continuing Operations before Income Taxes, Domestic Schedule of Share-Based Compensation Cost Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Operating lease liabilities Less: current portion of lease liabilities Operating Lease, Liability, Current Nontaxable or nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] Interest on lease liabilities Finance Lease, Interest Expense Document Fiscal Period Focus Document Fiscal Period Focus Net receivable Accounts Receivable (Payable), Net, Current Accounts Receivable (Payable), Net, Current Award Timing Method Award Timing Method [Text Block] Employee Stock Purchase Plan Employee Stock Purchase Plans [Member] Employee Stock Purchase Plans Basic (in USD per share) Income (Loss) from Continuing Operations, Per Basic Share LTM Revenue Multiple Measurement Input, Revenue Multiple [Member] Award Type Award Type [Axis] Non-current portion of contract liabilities (including non-current portion of contract liabilities from related parties of $23 and $24 as of March 31, 2026 and 2025, respectively) Contract liabilities noncurrent Contract with Customer, Liability, Noncurrent Hedging Relationship [Domain] Hedging Relationship [Domain] Staff costs: Employer taxes related to share-based compensation Share-Based Payment Arrangement, Employer Taxes Share-Based Payment Arrangement, Employer Taxes Investment, Name [Domain] Investment, Name [Domain] Share-based Compensation Share-Based Payment Arrangement [Policy Text Block] South Korea Korea (South), Won Trading Symbol Trading Symbol 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Business Combinations Business Combination [Policy Text Block] Proceeds from maturity of short-term investments Proceeds from Sale, Maturity and Collection of Short-Term Investments Issuance of vested shares from share-based payment arrangements (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Finance leases Finance Lease, Weighted Average Discount Rate, Percent Intangible Assets, Net Intangible Assets Disclosure [Text Block] Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Non-cash distributions to shareholders Non-cash Distributions To Shareholders Non-cash Distributions To Shareholders Restricted Stock Units (RSUs) Restricted share units Restricted Stock Units (RSUs) [Member] Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Largest Customer Largest Customer [Member] Largest Customer Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Entity Emerging Growth Company Entity Emerging Growth Company Purchases of intangible assets Payments to Acquire Intangible Assets Other Adjustments Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract] Changes in assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Finance leases Finance Lease, Weighted Average Remaining Lease Term Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Intangible assets under development Indefinite-Lived Intangible Assets (Excluding Goodwill) Less imputed interest Finance Lease, Liability, Undiscounted Excess Amount Common stock, shares, outstanding (in shares) Balance, beginning of period (in shares) Balance, ending of period (in shares) Common Stock, Shares, Outstanding Additional (reversal of) provision Accounts Receivable, Credit Loss Expense (Reversal) Four Customers Four Customers [Member] Four Customers Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Net deferred tax assets decreased amount Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Shares issued in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Non-cash withholding tax on vested shares Non-cash Withholding Tax On Vested Shares Non-cash Withholding Tax On Vested Shares Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Prepaid expenses and other current assets Total prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax benefit (expense) Total income tax benefit (expense) Income Tax Expense (Benefit) Income tax benefit (expense) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax 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 Other receivables Other Loan [Member] Other Loan Document Information [Line Items] Document Information [Line Items] Non-current portion of accrued compensation Employee Related Liabilities, Noncurrent Employee Related Liabilities, Noncurrent Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as cash flow hedges Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Net change of the effective portion of designated cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Hedging Relationship [Axis] Hedging Relationship [Axis] Total property and equipment, gross Property, Plant and Equipment, Gross Purchases of equity investments Payments to acquire non-marketable preferred stock Payments to Acquire Long-Term Investments Discontinued Operations and Disposal Groups [Abstract] Operating lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] United Kingdom Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Government grants recognized Government Grants Recognized Government Grants Recognized Deferred tax asset, operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards, Domestic 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 Commitments and Contingencies Disclosure [Abstract] Operating margin Operating Margin Operating Margin Weighted Average Remaining Lease Term (in years) Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term Foreign exchange Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation Deferred tax assets, operating loss carryforwards, U.S. Deferred Tax Assets, Operating Loss Carryforwards, Foreign Net cash provided by (used for) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Equity investments (including investments held under fair value option of $148 and $300 as of March 31, 2026 and 2025, respectively) Total equity investments Long-Term Investments Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Sale of equity investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Property and equipment, useful lives Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Schedule of Assumptions used to Estimate Fair Value Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Investment in non-marketable preferred stock, in exchange for trade receivables Investment In Non-Marketable Preferred Stock, In Exchange For Receivables Investment In Non-Marketable Preferred Stock, In Exchange For Receivables Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Customer prepayment and billing in advance of performance Contract With Customer, Liability, Prepayment And Billing Contract With Customer, Liability, Prepayment And Billing 2030 Finance Lease, Liability, to be Paid, Year Four Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Number of leases signed but not yet commenced Lessee, Operating Lease, Lease Not Yet Commenced, Number Of Leases Lessee, Operating Lease, Lease Not Yet Commenced, Number Of Leases Non-cash reclassification of share-based compensation costs Non-cash Reclassification Of Share-Based Compensation Costs Non-cash Reclassification Of Share-Based Compensation Costs Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Share-based awards, liability paid Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid Capitalized computer software Capitalized Computer Software, Additions Entity Address, Country Entity Address, Country Financing cash flows used for finance leases Finance Lease, Principal Payments Linaro Agreement Linaro Agreement [Member] Linaro Agreement Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Convertible loans receivable Convertible promissory note Loans Receivable, Fair Value Disclosure Total current liabilities Liabilities, Current Individual: Individual [Axis] Defined contribution plan, expense Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Non-cash additions in finance lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Document Annual Report Document Annual Report Research and development Research and Development Expense [Member] Equity method investments under equity method Equity Method Investments, Excluding Fair Value Option Equity Method Investments, Excluding Fair Value Option Amortization Amortization Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Tax losses and research and development tax credits Deferred Tax Asset, In-Process Research and Development Retirement Assets Retirement Assets [Member] Retirement Assets Entity Interactive Data Current Entity Interactive Data Current Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Share-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Schedule of Restricted Stock Unit Activity Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Ownership [Domain] Ownership [Domain] 2028 Finance Lease, Liability, to be Paid, Year Two Finance lease right-of-use assets, net Finance Lease, Right-of-Use Asset, Accumulated Amortization Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Restricted Stock Units, Launch Awards Restricted Stock Units, Launch Awards [Member] Restricted Stock Units, Launch Awards Acetone Limited Acetone Limited [Member] Acetone Limited Other non-current assets Other Assets, Noncurrent Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Asset retirement obligation Asset Retirement Obligation Foreign currency forward contracts Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Disposal, Restructuring and other Operating Expenses, Net Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Supplemental disclosure of cash flow information: Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Contract liabilities (including contract liabilities from related parties of $36 and $81 as of March 31, 2026 and 2025, respectively) Contract liabilities current Contract with Customer, Liability, Current Nontaxable or nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract] 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] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Unrecognized share-based compensation Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount United Kingdom statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Less: income tax effect Share-Based Payment Arrangement, Expense, Tax Benefit, Net Share-Based Payment Arrangement, Expense, Tax Benefit, Net Nonrelated Party Nonrelated Party [Member] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Loans and other receivables carried at amortized cost Financing Receivable, before Allowance for Credit Loss Gross Carrying Amount Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Other Entities Controlled By SoftBank Group Other Entities Controlled By SoftBank Group [Member] Other Entities Controlled By SoftBank Group Entity Address, Address Line One Entity Address, Address Line One Research and development Research and Development Expense Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Allowance for current expected credit losses Beginning balance Ending balance Accounts receivable, allowance Accounts Receivable, Allowance for Credit Loss, Current Tax withholding on vested shares from share-based payment arrangements (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Ownership [Axis] Ownership [Axis] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] DreamBig Semiconductor, Inc. DreamBig Semiconductor, Inc. [Member] DreamBig Semiconductor, Inc. Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Tax loss carryforward Operating Loss Carryforwards Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Staff costs: Salaries, bonuses and benefits Labor and Related Expense Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Equity-classified share-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period 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] Proceeds from sale or liquidation of equity investments Proceeds From Sale And Liquidations Of Equity Method Investments Proceeds From Sale And Liquidations Of Equity Method Investments Finance leases Right-Of-Use Assets Obtained In Exchange For Finance Lease Liability, Adjusted Right-Of-Use Assets Obtained In Exchange For Finance Lease Liability, Adjusted Cancelled and forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Deferred income taxes Deferred Income Taxes and Tax Credits Other non-staff costs Other Non-Staff Costs, Net Other Non-Staff Costs, Net Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Investments, All Other Investments [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued defined contribution plan Liability, Defined Contribution Plan Liability, Defined Contribution Plan Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Loans Receivable and Convertible Loans Receivable Policy Loans Receivable, Policy [Policy Text Block] Non-PEO NEO Non-PEO NEO [Member] Issuance of ordinary shares under Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Restricted Stock Units, Liability-Classified Restricted Stock Units, Liability-Classified [Member] Restricted Stock Units, Liability-Classified Right-of-use assets Deferred Tax Liabilities, Leasing Arrangements Appointments To Board Appointments To Board Appointments To Board Sale of Stock [Axis] Sale of Stock [Axis] Allowance for current expected credit losses Financing Receivable, Allowance for Credit Loss All Award Types Award Type [Domain] Change in gains (losses) recognized in accumulated other comprehensive income (loss) on cash flow hedge derivatives Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Goodwill Goodwill Disclosure [Text Block] Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Other non-cash operating activities, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent Research and development tax credit receivables Research And Development Tax Credit Receivable Research And Development Tax Credit Receivable Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] 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 Accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities 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 PRC China CHINA MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other foreign jurisdictions Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Document Shell Company Report Document Shell Company Report Employee Stock Employee Stock [Member] Maximum employee subscription amount Share-based Compensation Arrangement By Share-Based Payment Award, Maximum Employee Subscription Amount Share-based Compensation Arrangement By Share-Based Payment Award, Maximum Employee Subscription Amount Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount [Abstract] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total deferred tax liabilities Deferred Tax Liabilities, Gross Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Royalty Revenue Royalty [Member] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Other Adjustments Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Withholding tax Effective Income Tax Rate Reconciliation, Withholding Tax, Amount Effective Income Tax Rate Reconciliation, Withholding Tax, Amount Minimum Minimum [Member] Valuation Technique, Probability-Weighted, Expected Return Valuation Technique, Probability-Weighted, Expected Return [Member] Valuation Technique, Probability-Weighted, Expected Return Company Selected Measure Name Company Selected Measure Name Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Operating cash flows used for operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Foreign Current Foreign Tax Expense (Benefit) Schedule of Omnibus Incentive Plan 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 Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 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 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Withholding tax Effective Income Tax Rate Reconciliation, Withholding Tax, Percent Effective Income Tax Rate Reconciliation, Withholding Tax, Percent Reclassification, Other Current Liabilities Reclassification, Other Current Liabilities [Member] Reclassification, Other Current Liabilities Income Tax Disclosure [Abstract] Document Transition Report Document Transition Report Total lease payments Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Income Taxes Income Tax Disclosure [Text Block] United Kingdom UNITED KINGDOM Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Patent box benefit Effective Income Tax Rate Reconciliation, Paton Box Benefit, Percent Effective Income Tax Rate Reconciliation, Paton Box Benefit, Percent Operating lease liabilities Increase (Decrease) in Operating Lease Liability Other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Equity method investments, fair value Equity Method Investments, Fair Value Disclosure Net Income (Loss) Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Common Control in SoftBank Common Control in SoftBank [Member] Common Control in SoftBank Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Catapult Ventures I, L.P. —NAV Catapult Ventures I, L.P. [Member] Catapult Ventures I, L.P. Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Loss contingency Loss Contingency Accrual Weighted average ordinary shares used to calculate basic net income (loss) per share (in shares) Weighted Average Number of Shares Issued, Basic Other receivables Other Receivables, Net, Current Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Payments of withholding tax on vested shares Payment, Tax Withholding, Share-Based Payment Arrangement Accelerated share-based compensation Share-Based Payment Arrangement, Accelerated Cost Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Financial Standby Letter of Credit Financial Standby Letter of Credit [Member] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities: Liabilities, Current [Abstract] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Total operating expenses Operating expenses Operating Expenses Level 1 Fair Value, Inputs, Level 1 [Member] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] 2022 RSU Plan 2022 Arm Limited RSU Award Plan [Member] 2022 Arm Limited RSU Award Plan Related Party Transaction [Table] Related Party Transaction [Table] Net income (loss) per ordinary share - diluted (in USD per share) Earnings Per Share, Diluted Accounts receivable, net (including receivables from related parties of $270 and $279 as of March 31, 2026 and 2025, respectively) Accounts receivable, net Total accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Government Incentives Government Grants, Policy [Policy Text Block] Government Grants, Policy Auditor Location Auditor Location Gross profit (loss) Gross Profit Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Total cash paid for income taxes Income Taxes Paid, Net Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Accrued compensation and benefits Total accrued compensation and benefits Accrued compensation and benefits and share-based compensation increase (decrease) Employee-related Liabilities, Current Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Total lease payments Lessee, Operating Lease, Liability, to be Paid Increase in contract with customer, asset Increase In Contract With Customer, Asset Increase In Contract With Customer, Asset Other Current Liabilities [Line Items] Other Current Liabilities [Line Items] Other Current Liabilities [Line Items] Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] Republic of Korea KOREA, REPUBLIC OF Expiration Date Trading Arrangement Expiration Date Other liabilities (including payables to related parties) Increase (Decrease) in Other Operating Liabilities Amounts of transaction Related Party Transaction, Amounts of Transaction Schedule of Equity Method Investments Equity Method Investments [Table Text Block] Property and equipment, net Total property and equipment, net Total property and equipment, net Property, Plant and Equipment, Net Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable, net (including receivables from related parties) Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Japan JAPAN United Kingdom statutory income tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Foreign tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Share-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent State and local income taxes, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Accrued vacation and sabbatical Accrued Vacation And Sabbatical, Current Accrued Vacation And Sabbatical, Current Finance lease liabilities Other current liabilities Less: current portion of lease liabilities Finance Lease, Liability, Current Current Fiscal Year End Date Current Fiscal Year End Date Developed technology Technology-Based Intangible Assets [Member] Time to liquidity event Expected holding period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] 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] India INDIA Derivative Liabilities Foreign currency forward contracts Derivative Liability Share based compensation arrangement maximum employee subscription rate Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Expected consideration to be transferred Business Combination, Price of Acquisition, Expected Dividends from equity investments Proceeds from Equity Method Investment, Distribution 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] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Description of Business and Summary of Significant Accounting Policies Recent Accounting and Disclosure Pronouncements Business Description and Accounting Policies [Text Block] Gross unrecognized tax benefits—April 1 Gross unrecognized tax benefits— March 31 Unrecognized Tax Benefits Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Approximate lease value Unrecorded Unconditional Purchase Obligation Common stock, capital shares reserved for future issuance, increase (in shares) Common Stock, Capital Shares Reserved For Future Issuance, Increase Common Stock, Capital Shares Reserved For Future Issuance, Increase Arm Non-Executive Directors RSU Award Plan Arm Non-Executive Directors RSU Award Plan [Member] Arm Non-Executive Directors RSU Award Plan Leases Lessee, Operating Leases [Text Block] Net cash provided by (used for) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Document Registration Statement Document Registration Statement Loan receivable, credit loss reversal Financing Receivable, Credit Loss, Expense (Reversal) Schedule of Allowance for Credit Losses Contract with Customer, Asset, Allowance for Credit Loss [Table Text Block] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] IP Licensing Revenue IP Licensing Revenue [Member] IP Licensing Revenue Financial liabilities Financial Liabilities Fair Value Disclosure [Abstract] Derivative, fair value Derivative, Fair Value, Net Debt securities, available-for-sale, noncurrent Debt Securities, Available-for-Sale, Noncurrent Equity method investments, fair value option, time to future exit Equity Method Investments, Fair Value Option, Time To Future Exit Equity Method Investments, Fair Value Option, Time To Future Exit Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Contract assets, transfer to accounts receivable Contract with Customer, Asset, Reclassified to Receivable Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Restricted Stock Units, Continuous Service Restricted Stock Units, Continuous Service [Member] Restricted Stock Units, Continuous Service Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Arduino Arduino SA [Member] Arduino SA Proceeds from sale of equity method investments Proceeds from Sale of Equity Method Investments Weighted average share price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] 2031 and thereafter Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Loan term Financing Receivable, Term Financing Receivable, Term Business Contact Business Contact [Member] License and Other Revenue License And Other Revenue [Member] License And Other Revenue Trade payables (including payables to related parties of $20 and $11 as of March 31, 2026 and 2025, respectively) Accounts Payable, Trade, Current Distribution to majority ordinary shareholder related to Pelion IOT Limited Equity Distribution To Majority Shareholder For Receivable Equity Distribution To Majority Shareholder For Receivable Equity method investments under fair value option Equity investments Equity method investments Equity Method Investments, Fair Value Option Equity Method Investments, Fair Value Option Common stock, shares issued (in shares) Common Stock, Shares, Issued Accelerator Advisory Limited Accelerator Advisory Limited [Member] Accelerator Advisory Limited Operating leases Operating Lease, Weighted Average Remaining Lease Term Schedule of Non-designated Hedging Instrument Gains (Losses) Derivatives Not Designated as Hedging Instruments [Table Text Block] Non-marketable equity securities (includes NAV) Gains (losses) on non-marketable equity securities (includes NAV) 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 Duration of each purchase period under the ESPP Share-Based Compensation Arrangement By Share-Based Payment Award, Purchase Period Share-Based Compensation Arrangement By Share-Based Payment Award, Purchase Period Trading Arrangement: Trading Arrangement [Axis] Tax liabilities Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount Performance Shares, Time Based Performance Shares, Time Based [Member] Performance Shares, Time Based Security Exchange Name Security Exchange Name Foreign Income Tax Paid, Foreign, after Refund Received HOPU-ARM Holding Company Limited HOPU-ARM Holding Company Limited [Member] HOPU-ARM Holding Company Limited Non-cash additions in operating lease right-of-use assets Non-Cash Additions In Operating Lease Right-Of-Use Assets Non-Cash Additions In Operating Lease Right-Of-Use Assets Total non-current liabilities Liabilities, Noncurrent Non-deductible/non-taxable items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Cost of Sales Cost Of Sales, Policy [Policy Text Block] Cost Of Sales, Policy Financial Instruments Financing Receivables [Text Block] Prepayments Prepaid Expense, Current Other current liabilities (including payables to related parties of $20 and $11 as of March 31, 2026 and 2025, respectively) Other current liabilities Total other current liabilities Other Liabilities, Current Contact Personnel Name Contact Personnel Name Asset Class [Domain] Asset Class [Domain] Gains on convertible loan receivable Fair value losses recognized in the Consolidated Income Statements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Reclassification, Type [Axis] Reclassification, Type [Axis] Statement [Line Items] Statement [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Research Tax Credit Carryforward Research Tax Credit Carryforward [Member] Aggregate increased ordinary shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Ordinary Shares Common Stock [Member] Vested (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Other Current Liabilities [Table] Other Current Liabilities [Table] Other Current Liabilities [Table] Intangible Assets, Net and Software Development Costs and Acquired Intangible Software Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Equity method investments, fair value option, measurement input Equity Method Investments, Fair Value Option, Measurement Input Equity Method Investments, Fair Value Option, Measurement Input Statistical Measurement [Domain] Statistical Measurement [Domain] Cerfe Labs, Inc. Cerfe Labs, Inc. [Member] Cerfe Labs, Inc. Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Related Party Transaction [Axis] Related Party Transaction [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Total intangible asset, Gross Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Asset Class [Axis] Asset Class [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Impairment of Long-lived Assets Other than Goodwill Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Equity method investments Gains (losses) on equity method investments Income (Loss) from Equity Method Investments Performance obligation satisfied in previous period Contract with Customer, Performance Obligation Satisfied in Previous Period Taiwan Taiwan TAIWAN Leases [Abstract] Income (loss) per share attributable to ordinary shareholders — basic Earnings Per Share, Basic [Abstract] Gross increases—tax positions in prior period Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Schedule of Other Noncurrent Liabilities Other Noncurrent Liabilities [Table Text Block] Executive Awards Executive Awards [Member] Executive Awards Contract assets (including contract assets from related parties of $646 and $152 as of March 31, 2026 and 2025, respectively) Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Interest income, net Interest Income (Expense), Nonoperating Singapore SINGAPORE Tax withholding on vested shares from share-based payment arrangements Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net income (loss) per ordinary share - basic (in USD per share) Earnings Per Share, Basic Schedule Of Balance Sheet Supplemental Disclosures Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Total gross deferred tax assets Deferred Tax Assets, Gross Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Remaining performance obligations, amount Revenue, Remaining Performance Obligation, Amount Measurement Input Type [Domain] Measurement Input Type [Domain] 2029 Finance Lease, Liability, to be Paid, Year Three Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Research and Development Research and Development Expense, Policy [Policy Text Block] Staff costs: Share-based compensation cost (equity settled) Pre-tax share-based compensation cost Staff costs: Share-based compensation cost (equity settled) Share-Based Payment Arrangement, Expense Hedging Designation [Domain] Hedging Designation [Domain] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] 2019 EIP Executive IPO Plan [Member] Executive IPO Plan Current assets: Assets, Current [Abstract] Total liabilities and shareholders’ equity Liabilities and Equity Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Outside basis differences Deferred Tax Liabilities, Outside Basis Difference Deferred Tax Liabilities, Outside Basis Difference Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Net share-based compensation cost Share-Based Payment Arrangement, Expense, after Tax Equity Method Investment [Table] Equity Method Investment [Table] Schedule of Operating Lease Liability Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Pay vs Performance Disclosure [Line Items] Total operating lease liabilities Total Operating Lease, Liability Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Convertible debt, noncurrent Convertible Debt, Noncurrent Liabilities: Liabilities [Abstract] Acquisitions and Divestitures Business Combination [Text Block] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Document Accounting Standard Document Accounting Standard Other non-current liabilities Total other non-current liabilities Other Liabilities, Noncurrent 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] Schedule of Equity Investments Investment [Table Text Block] Goodwill impairment Goodwill, Impairment Loss Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Depreciation Depreciation, Including Finance Lease Depreciation, Including Finance Lease Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Schedule of Components of Income Before Provision for Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Contract with customer, payment required Contract with Customer, Asset, Threshold Period Past Due Deferred tax liabilities Deferred Income Tax Liabilities, Net Schedule of Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Third Largest Customer Third Largest Customer [Member] Third Largest Customer Legal Entity [Axis] Legal Entity [Axis] Total assets Assets 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One 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 Geographical [Domain] Geographical [Domain] 2019 AEP Arm Limited All Employee Plan 2019 [Member] Arm Limited All Employee Plan 2019 Income Taxes Income Tax, Policy [Policy Text Block] Cash flows provided by (used for) operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] Research and development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Weighted Average Remaining Life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Concentration Risk Type [Axis] Concentration Risk Type [Axis] Transaction costs Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Transaction Costs Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Transaction Costs Financial assets Assets, Fair Value Disclosure [Abstract] 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four 2027 Finance Lease, Liability, to be Paid, Year One Impairment of long-lived assets Impairment, Long-Lived Asset, Held-for-Use Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability DeepTech Labs Fund 1 LP DeepTech Labs Fund 1 LP [Member] DeepTech Labs Fund 1 LP Finance lease cost: Lease, Cost [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] State and local income taxes, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Income Tax Examination [Line Items] Income Tax Examination [Line Items] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Tac Credit Carryforward With Expiration Tax Credit Carryforward With Expiration [Member] Tax Credit Carryforward With Expiration Business Combination [Domain] Business Combination [Domain] Restricted Stock Units, Annual Awards Restricted Stock Units, Annual Awards [Member] Restricted Stock Units, Annual Awards Pre-tax gains on disposal Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Related Party Related Party Related Party [Member] Gains (loss) on early termination of operating leases Gain (Loss) on Termination of Lease Reportable Segment Reportable Segment [Member] Reportable Segment Schedule of Benefit (Expense) for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] Property and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Document Information [Table] Document Information [Table] PEO PEO [Member] Acquired intangibles Deferred Tax Liabilities, Intangible Assets Income Tax Paid, by Individual Jurisdiction [Line Items] Income Tax Paid, by Individual Jurisdiction [Line Items] Loss contingency accrual reversal Loss Contingency Accrual, Period Increase (Decrease) United States United States UNITED STATES Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Expected volatility until liquidity event Expected stock price volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Retained Earnings Retained Earnings [Member] Project materials costs, third-party fees paid to consultants, information technology, research and development expenses (excluding employee-related expenses), accounting and legal professional services fees, advertising expenses, and other corporate-related expenses Project Materials Expense Project Materials Expense Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] 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 Schedule of Accrued Compensation and Benefits Schedule of Accrued Liabilities [Table Text Block] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative Assets Foreign currency forward contracts Derivative Asset Sale of Stock [Domain] Sale of Stock [Domain] Tax liabilities Taxes Payable, Current Intangible assets, net Total Intangible Asset, Net Carrying Value Intangible Assets, Net (Excluding Goodwill) Product and Service [Domain] Product and Service [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Diluted (in USD per share) Income (Loss) from Continuing Operations, Per Diluted Share Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total financial liabilities Liabilities, Fair Value Disclosure Restricted Stock Units, Time-Based Restricted Stock Units, Time-Based [Member] Restricted Stock Units, Time-Based Derivative, notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Table] Fourth Largest Customer Fourth Largest Customer [Member] Fourth Largest Customer Publicly Listed Companies Publicly Listed Companies [Member] Publicly Listed Companies City Area Code City Area Code Schedule of Loans and Other Receivables Carried at Amortized Cost Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Investments Investment [Text Block] Right-of-use assets obtained in exchange for lease obligations: Lessee Disclosure [Abstract] Schedule of Reconciliation of Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash flows provided by (used for) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Long-lived assets Long-Lived Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Related Party Transactions [Abstract] Three Largest Customers Three Largest Customers [Member] Three Largest Customers Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Total finance lease cost Lease, Cost Selling, general and administrative Selling, general and administrative expenses Selling, General and Administrative Expenses [Member] Cash Flow Hedging Cash Flow Hedging [Member] Equity investments in publicly listed companies Equity Securities, FV-NI Cost of sales Cost of Sales [Member] Goodwill Goodwill Schedule of Lease Expense Components Lease, Cost [Table Text Block] Income (loss) from equity investments, net (Income) loss from equity investments, net Total income (loss) from equity investments, net Gain (Loss) on Investments United Kingdom Deferred Federal Income Tax Expense (Benefit) Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Auditor Name Auditor Name Share-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Non-current portion of accrued compensation and share-based compensation increase (decrease) Accounts Payable and Accrued Liabilities, Noncurrent Market value of shares held in EBT Common Stock, Shares Held in Employee Trust Equipment Equipment [Member] License arrangement term Contract With Customer, License Arrangement Term Contract With Customer, License Arrangement Term Internal-use software Software, Internally Developed [Member] Software, Internally Developed Other Performance Measure, Amount Other Performance Measure, Amount Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Over-Allotment Option Over-Allotment Option [Member] Equity investments in publicly listed companies Equity Securities, FV-NI, Gain (Loss) Non-cash additions in intangible assets Non-Cash Changes In Intangible Assets Non-Cash Changes In Intangible Assets Entity [Domain] Entity [Domain] Net cash provided by (used for) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligation, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Gain on business divestiture Gain (Loss) on Disposition of Business Document Fiscal Year End Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Employee Stock Purchase Plan liability Accrued Employee Benefits, Current Income tax benefit (expense) Effective Income Tax Rate Reconciliation, Percent Gross decreases—tax positions in prior period Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Operating lease cost Operating Lease, Cost Plan Name [Domain] Plan Name [Domain] Arm China Arm China [Member] Arm China Unrecognized share-based compensation, recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Artisan Foundation IP Business Artisan Foundation IP Business [Member] Artisan Foundation IP Business Patents and licenses Patents & licenses Patents And Licenses [Member] Patents And Licenses Less: Valuation allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Performance Shares, Continuous Service And Performance Conditions Performance Shares, Continuous Service And Performance Conditions [Member] Performance Shares, Continuous Service And Performance Conditions Purchase commitment Purchase Obligation Derivative Financial Instruments and Hedge Activities Derivatives, Policy [Policy Text Block] Segment and Geographic Information Segment Reporting Disclosure [Text Block] Aggregate nominal amount, limit Share-Based Compensation Arrangement By Share-Based Payment Award, Aggregate Nominal Amount, Limit, Percent Share-Based Compensation Arrangement By Share-Based Payment Award, Aggregate Nominal Amount, Limit, Percent 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] Non-designated hedges Not Designated as Hedging Instrument [Member] Foreign tax deduction Effective Income Tax Rate Reconciliation, Nondeductible Expense, Foreign Tax Deduction, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Foreign Tax Deduction, Amount United Kingdom Current Federal Tax Expense (Benefit) Number of executive awards Number Of Executive Awards Number Of Executive Awards Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] 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 Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Total amortization expense Amortization of Intangible Assets Leases Lessee, Leases [Policy Text Block] Loans receivable Loans Receivable [Member] Selling, general and administrative Selling, General and Administrative Expense Deferred tax assets Deferred Income Tax Assets, Net Omnibus Incentive Plan Omnibus Incentive Plan [Member] Omnibus Incentive Plan Depreciation and amortization Depreciation, Depletion and Amortization Loan receivable, noncurrent Financing Receivable, after Allowance for Credit Loss, Noncurrent Foreign tax deduction Effective Income Tax Rate Reconciliation, Nondeductible Expense, Foreign Tax Deduction, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Foreign Tax Deduction, Percent Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Other foreign jurisdictions Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Total finance lease liabilities Total finance lease liabilities Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Other non-current liabilities Other Sundry Liabilities, Noncurrent Segments [Axis] Segments [Axis] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Accounts receivable, before allowance for credit loss, current Accounts Receivable, before Allowance for Credit Loss, Current Other investing activities, net, including investments in convertible loans Payment for (Proceeds from) Other Investing Activity Non-current portion of contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Discount percent Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Share-based Compensation Share-Based Payment Arrangement [Text Block] Payments of intangible asset obligations Repayments Of Intangible Asset Obligation Repayments Of Intangible Asset Obligation Assets: Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 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 Retirement Benefits Plans Retirement Benefits [Text Block] Fair Value Fair Value Disclosures [Text Block] Shareholders’ equity: Equity, Attributable to Parent [Abstract] Vesting Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Number of grantees affected by modification Share-Based Payment Arrangement, Plan Modification, Number of Grantees Affected 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 Investment, Name [Axis] Investment, Name [Axis] Reclassification, Other Noncurrent Liabilities Reclassification, Other Noncurrent Liabilities [Member] Reclassification, Other Noncurrent Liabilities Non-current portion of operating lease liabilities Non-current portion of lease liabilities Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers Total intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Property, Plant and Equipment [Abstract] Entity Name Entity Registrant Name Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Capitalized computer software, amortization Capitalized Computer Software, Amortization Convertible debt, current Convertible Debt, Current China Walden Ventures Investments III, L.P. —NAV China Walden Ventures Investments III, L.P. [Member] China Walden Ventures Investments III, L.P. Total financial assets Assets, Fair Value Disclosure Non-marketable equity securities Equity Securities without Readily Determinable Fair Value, Amount Number of operating segments Number of Operating Segments Purchased an additional ordinary shares amount Payments to Acquire Equity Securities, FV-NI Income Tax, Examination [Table] Income Tax, Examination [Table] 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 Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent [Abstract] Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) Accounts Receivable Accounts Receivable [Member] Version extension release period Contract With Customer, Version Extension Release Period Contract With Customer, Version Extension Release Period Number of reporting units Number of Reporting Units Other financing activities, net Proceeds from (Payment for) Other Financing Activity Impact of U.K. rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Name Trading Arrangement, Individual Name Service Share Arrangement Service Share Arrangement [Member] Service Share Arrangement Statement of Comprehensive Income [Abstract] Fixed assets Deferred Tax Assets, Property, Plant and Equipment Name Awards Close in Time to MNPI Disclosures, Individual Name Outstanding (in dollars per share) Outstanding, beginning of period (in dollars per share) Outstanding, ending of period (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 Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Share-based compensation cost APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Impairment of non-marketable equity securities Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Schedule of Operating Lease Liability Maturity Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Cash paid for amounts included in the measurement of lease liabilities: Cash Paid For Lease Liabilities [Abstract] Cash Paid For Lease Liabilities Country Region Country Region Foreign Tax Jurisdiction Foreign Tax Jurisdiction [Member] Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Patent box benefit Effective Income Tax Rate Reconciliation, Paton Box Benefit, Amount Effective Income Tax Rate Reconciliation, Paton Box Benefit, Amount Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Other receivables Other Receivables [Member] Other Receivables Total non-current assets Assets, Noncurrent Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Non-current assets: Assets, Noncurrent [Abstract] Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net Income (Loss) Per Share Attributable to Ordinary Shareholders Earnings Per Share, Policy [Policy Text Block] Proceeds from Employee Stock Purchase Plan Proceeds from Stock Plans All Executive Categories All Executive Categories [Member] Schedule of Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Ordinary shares, $0.001 par value; 1,097 shares authorized and 1,064 shares issued and outstanding as of March 31, 2026; and 1,088 shares authorized and 1,057 issued and outstanding as of March 31, 2025 Common Stock, Value, Issued Indefinite lived intangible assets Indefinite Lived Intangible Assets [Abstract] Indefinite Lived Intangible Assets Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Short-term investments Short-Term Investments Schedule of Realized Gain (Loss) on Investments Realized Gain (Loss) on Investments [Table Text Block] Commitments and contingencies (Note 18) Commitments and Contingencies Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Business Combination [Axis] Business Combination [Axis] Schedule of Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Raspberry Pi Holdings plc’s Raspberry Pi Holdings plc’s [Member] Raspberry Pi Holdings plc’s Equity Investments Equity Method Investments [Policy Text Block] Ownership percentage Equity Method Investment, Ownership Percentage Net deferred tax assets (liabilities) Deferred Tax Assets, Net Other Equity Investments Other Equity Investments [Member] Other Equity Investments PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Accrued expenses and fees Accrued Expenses And Fees, Current Accrued Expenses And Fees, Current Income (loss) per share attributable to ordinary shareholders — diluted Earnings Per Share, Diluted [Abstract] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Convertible loans receivable Convertible Loans Receivable [Member] Convertible Loans Receivable Schedule of Changes in Gross Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] (Gains) losses reclassified from accumulated other comprehensive income (loss) into income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period All Individuals All Individuals [Member] Fair Value Disclosures [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Point-in-time revenues Transferred at Point in Time [Member] Name Forgone Recovery, Individual Name 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 Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Customer deposits Contract with Customer, Refund Liability 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 Geographical [Axis] Geographical [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Employee related payroll taxes and payables Accrued Payroll Taxes, Current Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Foreign tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount Net income (loss) per share attributable to ordinary shareholders Earnings Per Share [Abstract] 2031 Lessee, Operating Lease, Liability, to be Paid, Year Five Tax credit carryforward Tax Credit Carryforward, Amount Contract liabilities (including contract liabilities from related parties) Increase (Decrease) in Contract with Customer, Liability Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Electronic design automation liabilities Electronic Design Automation Liabilities, Noncurrent Electronic Design Automation Liabilities, Noncurrent Thereafter Finance Lease, Liability, to be Paid, after Year Five Award Timing Disclosures [Line Items] Shareholders' Equity Equity [Text Block] Tax Credit Carryforward With No Expiration Tax Credit Carryforward With No Expiration [Member] Tax Credit Carryforward With No Expiration 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 Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Operating leases Operating Lease, Liability [Abstract] Non-current liabilities: Liabilities, Noncurrent [Abstract] Non-cash additions in operating lease liabilities Non-Cash Additional Of Operating Lease Liabilities Non-Cash Additional Of Operating Lease Liabilities Socratic Partners I LP Socratic Partners I LP [Member] Socratic Partners I LP Construction in progress Construction in Progress [Member] Operating lease, lease income, lease payments Operating Lease, Lease Income, Lease Payments Proceeds from settlement of loans, including convertible loans Proceeds from Collection of Loans Receivable Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Loans receivable, noncurrent Financing Receivable, before Allowance for Credit Loss, Noncurrent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Reclassification of Presentation in Consolidated Balance Sheets Reclassification, Comparability Adjustment [Policy Text Block] Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Customer [Axis] Customer [Axis] Selling, General and Administrative Selling, General and Administrative Expenses, Policy [Policy Text Block] Customer relationships Customer Relationships [Member] Operating income (loss) Operating Income (Loss) Equity Method Investments, Fair Value Option Equity Method Investments, Fair Value Option [Member] Equity Method Investments, Fair Value Option Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Over-time revenues Transferred over Time [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other Deferred Tax Liabilities, Other Other non-operating income (loss), net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Total deferred tax benefit (expense) Deferred Income Tax Expense (Benefit) 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 Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Cash flows provided by (used for) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Present value per RSU (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Present Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Present Value Weighted average ordinary shares outstanding Earnings Per Share, Basic, Other Disclosure [Abstract] Other foreign jurisdictions Foreign Tax Jurisdiction, Other [Member] Second Largest Customer Second Largest Customer [Member] Second Largest Customer Beginning balance Ending balance Contract with Customer, Liability Other non-current liabilities Non-current portion of lease liabilities Finance Lease, Liability, Noncurrent Gains exempt from U.K. tax Effective Income Tax Rate Reconciliation, Exempt Gains, Amount Effective Income Tax Rate Reconciliation, Exempt Gains, Amount Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Share-based compensation, tax benefit (expense) Share-Based Payment Arrangement, Expense, Tax Benefit Sale of stock (in dollars per share) Sale of Stock, Price Per Share Shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Termination Date Trading Arrangement Termination Date Contract assets, net (including contract assets from related parties) Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Receivable [Domain] Receivable [Domain] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Unrecognized tax benefits, income tax penalties and interest accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Segment Reporting [Abstract] Cost of sales Cost of Revenue Income tax, (benefit) expense, accrued interest Income Tax Examination, Penalties and Interest Expense China Walden Ventures Investments II, L.P. —NAV China Walden Ventures Investments, II, L.P. [Member] China Walden Ventures Investments, II, L.P. Accounts receivable Accounts Receivable, before Allowance for Credit Loss Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share 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 Shares held in EBT (in shares) Common Stock, Shares Held in Employee Trust, Shares Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Audit Information [Abstract] Audit Information [Abstract] Audit Information Use of Estimates Use of Estimates, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Operating cash flows used for finance leases Finance Lease, Interest Payment on Liability Address Type [Domain] Address Type [Domain] Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] 2031 Finance Lease, Liability, to be Paid, Year Five Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Gross increases—tax positions in current period Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Arm IOT Fund LP (Taiwan) ARM IOT Fund LP (Taiwan) [Member] ARM IOT Fund LP (Taiwan) Contract termination costs Gain (Loss) on Contract Termination Counterparty Name [Axis] Counterparty Name [Axis] Available-for-sale debt securities Debt Securities, Available-for-Sale Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Financial commitments to investees, off balance sheet Financial Commitments To Investees, Off Balance Sheet Financial Commitments To Investees, Off Balance Sheet Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]