Arm Holdings plc American Depositary Shares (ARM) 6-K 7 Nov 24 2025 Q2 Current report (foreign) Financial data

Cover Page

Cover Page	6 Months Ended
	Sep. 30, 2024
Cover [Abstract]
Document Type	6-K
Entity Central Index Key	0001973239
Entity Registrant Name	ARM HOLDINGS PLC /UK
Current Fiscal Year End Date	--03-31
Document Period End Date	Sep. 30, 2024
Document Fiscal Year End Focus	2025
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Income S

Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue	$ 844	$ 806	$ 1,783	$ 1,481
Cost of sales	(32)	(46)	(65)	(77)
Gross profit	812	760	1,718	1,404
Research and development	(507)	(626)	(992)	(963)
Selling, general and administrative	(241)	(290)	(480)	(486)
Total operating expense	(748)	(916)	(1,472)	(1,449)
Operating income (loss)	64	(156)	246	(45)
Income (loss) from equity investments, net	(10)	(5)	14	(12)
Interest income, net	29	28	61	52
Other non-operating income (loss), net	(19)	14	(13)	13
Income (loss) before income taxes	64	(119)	308	8
Income tax benefit (expense)	43	9	22	(13)
Net income (loss)	$ 107	$ (110)	$ 330	$ (5)
Net income (loss) per share attributable to ordinary shareholders
Basic (in USD per share)	$ 0.10	$ (0.11)	$ 0.32	$ 0
Diluted (in USD per share)	$ 0.10	$ (0.11)	$ 0.31	$ 0
Weighted average ordinary shares outstanding
Basic (in shares)	1,049,000,000	1,025,000,000	1,047,000,000	1,025,000,000
Diluted (in shares)	1,063,000,000	1,025,000,000	1,061,000,000	1,025,000,000
External Customers
Revenue	$ 652	$ 644	$ 1,467	$ 1,179
Related Parties
Revenue	$ 192	$ 162	$ 316	$ 302

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 107	$ (110)	$ 330	$ (5)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	25	(16)	24	(10)
Net change of the effective portion of designated cash flow hedges	14	(14)	15	(14)
Total comprehensive income (loss)	$ 146	$ (140)	$ 369	$ (29)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Current assets:
Cash and cash equivalents	$ 1,498	$ 1,923
Short-term investments	860	1,000
Accounts receivable, net (including receivables from related parties of $164 and $182 as of September 30, 2024 and March 31, 2024, respectively)	1,006	781
Contract assets (including contract assets from related parties of $55 and $22 as of September 30, 2024 and March 31, 2024, respectively)	454	336
Prepaid expenses and other current assets	246	157
Total current assets	4,064	4,197
Non-current assets:
Property and equipment, net	291	215
Operating lease right-of-use assets	232	205
Equity investments (including investments held at fair value of $561 and $573 as of September 30, 2024 and March 31, 2024, respectively)	796	741
Goodwill	1,641	1,625
Intangible assets, net	184	152
Deferred tax assets	351	282
Non-current portion of contract assets	273	240
Other non-current assets	254	270
Total non-current assets	4,022	3,730
Total assets	8,086	7,927
Current liabilities:
Accrued compensation and benefits	104	298
Tax liabilities	148	147
Contract liabilities (including contract liabilities from related parties of $107 and $107 as of September 30, 2024 and March 31, 2024, respectively)	218	198
Operating lease liabilities	29	27
Other current liabilities (including payables to related parties of $12 and $7 as of September 30, 2024 and March 31, 2024, respectively)	400	835
Total current liabilities	899	1,505
Non-current liabilities:
Non-current portion of accrued compensation	21	20
Deferred tax liabilities	131	135
Non-current portion of contract liabilities	704	717
Non-current portion of operating lease liabilities	229	194
Other non-current liabilities	90	61
Total non-current liabilities	1,175	1,127
Total liabilities	2,074	2,632
Commitments and contingencies (Note 12)
Shareholders’ equity:
Ordinary shares, $0.001 par value; 1,088 shares authorized and 1,051 shares issued and outstanding as of September 30, 2024; and 1,088 shares authorized and 1,040 shares issued and outstanding as of March 31, 2024	2	2
Additional paid-in capital	2,519	2,171
Accumulated other comprehensive income (loss)	410	371
Retained earnings	3,081	2,751
Total shareholders’ equity	6,012	5,295
Total liabilities and shareholders’ equity	$ 8,086	$ 7,927

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Accounts receivable, net	$ 1,006	$ 781
Contract assets	454	336
Equity method investments under fair value option	561	573
Contract liabilities	218	198
Other current liabilities	$ 400	$ 835
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,088	1,088
Common stock, shares issued (in shares)	1,051	1,040
Common stock, shares, outstanding (in shares)	1,051	1,040
Related Parties
Accounts receivable, net	$ 164	$ 182
Contract assets	55	22
Contract liabilities	107	107
Other current liabilities	$ 12	$ 7

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions		Total	Ordinary Shares	Additional Paid- in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance, beginning of period (in shares) at Mar. 31, 2023			1,025
Balance, beginning of period at Mar. 31, 2023		$ 4,051	$ 2	$ 1,216	$ 376	$ 2,457
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(5)				(5)
Net change in fair value of the effective portion of designated cash flow hedges, net of tax		(14)			(14)
Foreign currency translation adjustments, net of tax		(10)			(10)
Share-based compensation cost		443		443
Tax withholding on vested shares from share-based payment arrangements		(23)		(23)
Reclassification of RSU awards previously liability-classified	[1]	343		343
Distribution to majority ordinary shareholder related to Pelion IOT Limited		(12)				(12)
Balance, ending of period (in shares) at Sep. 30, 2023			1,025
Balance, ending of period at Sep. 30, 2023		4,773	$ 2	1,979	352	2,440
Balance, beginning of period (in shares) at Jun. 30, 2023			1,025
Balance, beginning of period at Jun. 30, 2023		4,221	$ 2	1,275	382	2,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(110)				(110)
Net change in fair value of the effective portion of designated cash flow hedges, net of tax		(14)			(14)
Foreign currency translation adjustments, net of tax		(16)			(16)
Share-based compensation cost		384		384
Tax withholding on vested shares from share-based payment arrangements		(23)		(23)
Reclassification of RSU awards previously liability-classified	[2]	343		343
Distribution to majority ordinary shareholder related to Pelion IOT Limited		(12)				(12)
Balance, ending of period (in shares) at Sep. 30, 2023			1,025
Balance, ending of period at Sep. 30, 2023		$ 4,773	$ 2	1,979	352	2,440
Balance, beginning of period (in shares) at Mar. 31, 2024		1,040	1,040
Balance, beginning of period at Mar. 31, 2024		$ 5,295	$ 2	2,171	371	2,751
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		330				330
Net change in fair value of the effective portion of designated cash flow hedges, net of tax		15			15
Foreign currency translation adjustments, net of tax		24			24
Share-based compensation cost		400		400
Issuance of vested shares from share-based payment arrangements (in shares)			11
Tax withholding on vested shares from share-based payment arrangements		$ (52)		(52)
Balance, ending of period (in shares) at Sep. 30, 2024		1,051	1,051
Balance, ending of period at Sep. 30, 2024		$ 6,012	$ 2	2,519	410	3,081
Balance, beginning of period (in shares) at Jun. 30, 2024			1,048
Balance, beginning of period at Jun. 30, 2024		5,663	$ 2	2,316	371	2,974
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		107				107
Net change in fair value of the effective portion of designated cash flow hedges, net of tax		14			14
Foreign currency translation adjustments, net of tax		25			25
Share-based compensation cost		218		218
Issuance of vested shares from share-based payment arrangements (in shares)			3
Tax withholding on vested shares from share-based payment arrangements		$ (15)		(15)
Balance, ending of period (in shares) at Sep. 30, 2024		1,051	1,051
Balance, ending of period at Sep. 30, 2024		$ 6,012	$ 2	$ 2,519	$ 410	$ 3,081
[1]Includes approximately $212 million of share-based compensation cost recognized in the six months ended September 30, 2023 for RSU awards previously liability-classified.[2] Includes approximately $129 million of share-based compensation cost recognized in the three months ended September 30, 2023 for restricted share units (“RSU”) awards previously liability-classified.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Share-based compensation cost	$ 384	$ 443
Restricted Stock Units, Liability-Classified
Share-based compensation cost	$ 129	$ 212

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows provided by (used for) operating activities:
Net income (loss)	$ 330	$ (5)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	87	82
Deferred income taxes	(11)	(17)
(Income) loss from equity investments, net	(14)	12
Share-based compensation cost	400	653
Operating lease expense	18	17
Other non-cash operating activities, net	12	(3)
Changes in assets and liabilities:
Accounts receivable, net (including receivables from related parties)	(225)	135
Contract assets, net (including contract assets from related parties)	(151)	(87)
Prepaid expenses and other assets	(56)	13
Accrued compensation and benefits	(193)	(442)
Contract liabilities (including contract liabilities from related parties)	7	(72)
Tax liabilities	(68)	(64)
Operating lease liabilities	(21)	(17)
Other liabilities (including payables to related parties)	(399)	(92)
Net cash provided by (used for) operating activities	(284)	113
Cash flows provided by (used for) investing activities
Purchases of short-term investments	(65)	(385)
Proceeds from maturity of short-term investments	205	246
Purchases of equity investments	(41)	(11)
Purchases of intangible assets	(16)	(13)
Purchases of property and equipment	(82)	(60)
Net cash provided by (used for) investing activities	1	(223)
Cash flows provided by (used for) financing activities
Payments of intangible asset obligations	(31)	(21)
Other financing activities, net	(21)	(6)
Payments of withholding tax on vested shares	(97)	(12)
Net cash provided by (used for) financing activities	(149)	(39)
Effect of foreign exchange rate changes on cash and cash equivalents	7	1
Net increase (decrease) in cash and cash equivalents	(425)	(148)
Cash and cash equivalents at the beginning of the period	1,923	1,554
Cash and cash equivalents at the end of the period	1,498	1,406
Non-cash investing and financing activities:
Non-cash additions in property and equipment	39	5
Non-cash additions in intangible assets	62	38
Non-cash additions in operating lease right-of-use assets	42	13
Non-cash additions of operating lease liabilities	43	13
Non-cash additions to equity investments from conversion of certain receivables	0	4
Non-cash distributions to shareholders	0	12
Non-cash withholding tax on vested shares	14	11
Non-cash reclassification of share-based compensation costs	$ 0	$ 343

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	1 - Description of Business and Summary of Significant Accounting Policies Description of Business Arm Holdings plc and its wholly owned subsidiaries (the “Company” and also referred to as “we,” “our” or “us”) is a global leader in the semiconductor industry. The Company’s principal operations are the licensing, marketing, research and development of microprocessors, systems intellectual property (“IP”), graphics processing units, physical IP and associated systems IP, software, tools and other related services. Corporate Reorganization In September 2023, the Company completed a board approved corporate reorganization which involved (1) the shareholders of Arm Limited exchanging each of the ordinary shares held by them in Arm Limited for newly issued ordinary shares of Arm Holdings Limited; and (2) the re-registration of Arm Holdings Limited as a public limited company under the laws of England and Wales at which time its name was changed to Arm Holdings plc. This corporate reorganization was solely for the purpose of reorganizing the Company’s corporate structure, in which Arm Limited became a wholly owned subsidiary of the holding company, Arm Holdings plc. This transfer of equity resulted in the issuance of ordinary shares of Arm Holdings plc to shareholders in the same class and the same number of ordinary shares as their previous shareholding in Arm Limited. As a result of the corporate reorganization between entities under common control, the historical consolidated financial statements of the Company were retrospectively adjusted for the change in reporting entity. Therefore, the historical consolidated financial statements of Arm Limited became the historical consolidated financial statements of Arm Holdings plc as of the date of the corporate reorganization. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the U.S. (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial information. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in the accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto as of and for the fiscal year ended March 31, 2024, in our Annual Report. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, consisting of only normal recurring adjustments, which are necessary for the fair statement of the unaudited condensed consolidated balance sheets, income statements, statements of comprehensive income, shareholders’ equity and cash flows for these interim periods. The results for the interim periods are not necessarily indicative of results for the full fiscal year. Principles of Consolidation The accompanying financial statements include the accounts of the Company, its wholly owned subsidiaries and the Arm Employee Benefit Trust (the “EBT”). All intercompany balances and transactions have been eliminated in consolidation. The financial statements consolidate all of the Company’s affiliates, and the entities where the Company holds a controlling financial interest, because the Company holds a majority voting interest. The Company reevaluates whether there is a controlling financial interest in all entities when rights and interests change. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant items subject to such estimates include, but are not limited to, revenue recognition, allowance for expected credit losses, income taxes, share-based compensation, impairment considerations for long-lived assets, fair value estimates and impairment for investments. The Company evaluates these estimates on an ongoing basis and revises estimates as circumstances change. The Company bases its estimates on historical experience, anticipated results, trends, and other various assumptions that it believes are reasonable. Actual results could differ materially from the Company’s estimates. Recently issued accounting pronouncements not yet adopted Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures: In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, which requires incremental reportable segment disclosures. The new standard requires that a public entity disclose significant segment expenses, the title and position of the chief operating decision maker (“CODM”), and how the CODM uses the reported measures in assessing performance and deciding how to allocate resources. ASU 2023-07 is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. Adoption of the ASU should be applied retrospectively to all prior periods presented in the financial statements. This ASU will result in additional required disclosures being included in our consolidated financial statements when adopted. The Company will adopt this standard in the annual financial statements for the fiscal year beginning April 1, 2024 and interim periods within the fiscal year beginning April 1, 2025. Income Taxes (Topic 740), Improvements to Income Tax Disclosures: In December 2023, the FASB issued ASU 2023-09, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as additional information on income taxes paid. The ASU is effective on a prospective basis for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. This ASU will likely result in additional required disclosures being included in our consolidated financial statements when adopted. The Company will adopt this standard for the fiscal year beginning April 1, 2025. Recently issued SEC final rules not yet adopted In March 2024, the SEC adopted final rules under SEC Release No. 33-11275, The Enhancement and Standardization of Climate-Related Disclosures for Investors , which requires a registrant to disclose climate-related risks that are reasonably likely to have a material impact on its business strategy, results of operations and financial condition. The rules include disclosures relating to climate-related risks and risk management, a registrant's governance of such risks, the financial impact on the audited financial statements, and greenhouse gas emissions. The disclosures will be required prospectively, with information for prior periods required only to the extent it was previously disclosed in an SEC filing. The earliest adoption date starts from the registrant's fiscal year beginning calendar 2025, which is the Company's fiscal year ending March 31, 2026. On April 4, 2024, the SEC determined to voluntarily stay the final rules pending certain legal challenges. The Company is currently evaluating the impact of the adoption of these final rules on its consolidated financial statements and disclosures.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	2 - Balance Sheet Components Certain balance sheet components are as follows: Prepaid expenses and other current assets consist of: As of (in millions) September 30, 2024 March 31, 2024 Research and development tax credit receivables $ 107 $ 68 Prepayments 71 49 Other receivables 68 40 Total prepaid expenses and other current assets $ 246 $ 157 Accrued compensation and benefits consist of: As of (in millions) September 30, 2024 March 31, 2024 Accrued bonus, commissions, and cash awards $ 11 $ 190 Accrued vacation and sabbatical 84 83 Accrued salaries and fringe benefits 9 25 Total accrued compensation and benefits $ 104 $ 298 Other current liabilities consist of: As of (in millions) September 30, 2024 March 31, 2024 Employee related payroll taxes and payables (1) $ 192 $ 674 Accrued expenses and fees 105 83 Electronic design automation liabilities 57 40 Trade payables (including payables to related parties of $12 and $7 as of September 30, 2024 and March 31, 2024, respectively) 34 26 Customer deposits 7 7 Finance lease liabilities 5 5 Total other current liabilities $ 400 $ 835 (1) Employee related payroll taxes and payables are primarily related to vested RSUs during the quarter and paid in the subsequent quarter.

Revenue

Revenue	6 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Revenue	3 - Revenue Revenue Recognition Revenue for the Company’s major product offerings consists of the following: License and Other Revenue • Intellectual property license — The Company generally licenses IP under non-exclusive license agreements that provide usage rights for specific applications for a finite or perpetual term. These licenses are made available electronically to address the customer-specific business requirements. These arrangements generally have distinct performance obligations that consist of transferring the licensed IPs, version extensions of architecture IP or releases of specified IPs, and support services. Support services consist of a stand-ready obligation to provide technical support, patches, and bug fixes over the support term. Revenue allocated to the IP license is recognized at a point in time upon the delivery or beginning of the license term, whichever is later. Revenue allocated to distinct version extensions of architecture IP or releases of specified IP, excluding when-and-if-available minor updates over the support term, are recognized at a point in time upon the delivery or beginning of license term, whichever is later. Certain license agreements provide customers with the right to access a library of current and future IPs on an unlimited basis over the contractual period depending on the terms of the applicable contract. These licensing arrangements represent stand-ready obligations in that the timing of the delivery of the underlying IPs is within the control of the customer and the extent of use in any given period does not diminish the remaining performance obligation. The contract consideration related to these arrangements is recognized ratably over the term of the contract in line with when the control of the performance obligations is transferred. Certain subscription license agreements include unspecified future IPs that are provided on a when-and-if-available basis, representing a stand-ready obligation. The contract consideration allocated to the stand-ready obligation is recognized on a ratable basis over the term of the contract, commencing upon the later of the effective date of the agreement and the transfer of the initial available IP license. • Software sales, including development systems — Sales of software, including development systems, which are not specifically designed for a given license (such as off-the-shelf software), are recognized upon delivery when control has been transferred and customer can begin to use and benefit from the license. • Professional services — Services (such as training, professional and design services) that the Company provides, which are not essential to the functionality of the IP, are separately stated and priced in the contract and accounted for separately. Training revenue is recognized as services are performed. Revenue from professional and design services are recognized over time using the input method based on engineering labor hours expended to date relative to the estimated total effort required. For such professional and design services, the Company has an enforceable right to payment for performance completed to date, which includes a reasonable profit margin and the performance of such services do not create an asset with an alternative use. In certain arrangements, the Company also provides customers with professional and design services, as a stand-ready obligation, that are recognized on a ratable basis over the term of the contract. • Support and maintenance — Support and maintenance is a stand-ready obligation to the customer that is both provided and consumed simultaneously. Revenue is recognized on a straight-line basis over the period for which support and maintenance is contractually agreed pursuant to the license. Royalty Revenue For most IP license agreements, royalties are collected on products that incorporate the Company’s IP. Royalties are recognized on an accrual basis in the quarter in which the customer ships their products, based on the Company’s technology that it contains. This estimation process for the royalty revenue accrual is based on a combination of methodologies, including the use of historical sales trends and macroeconomic factors for predictive analysis, the analysis of customer royalty reports and their sales trends and forecasts, as well as data and forecasts from third-party industry research providers. Data considered includes revenue, unit shipments, average selling price, product mix, market share and market penetration. Adjustments to revenue are required in subsequent periods to reflect changes in estimates as new information becomes available, primarily resulting from actual amounts subsequently reported by the licensees in the period following the accrual, including royalty audit resolutions. Disaggregation of Revenue A summary of the Company’s disaggregated revenue is as follows: Three Months Ended September 30, External Customers Related Parties Total (in millions) 2024 2023 2024 2023 2024 2023 License and Other Revenue (1) $ 240 $ 294 $ 90 $ 94 $ 330 $ 388 Royalty Revenue 412 350 102 68 514 418 $ 652 $ 644 $ 192 $ 162 $ 844 $ 806 (1) Includes over-time revenue of $120 million and $30 million , and point-in-time revenue of $210 million and $358 million , for the three months ended September 30, 2024 and 2023, respectively. Six Months Ended September 30, External Customers Related Parties Total (in millions) 2024 2023 2024 2023 2024 2023 License and Other Revenue (1) $ 681 $ 474 $ 121 $ 189 $ 802 $ 663 Royalty Revenue 786 705 195 113 981 818 $ 1,467 $ 1,179 $ 316 $ 302 $ 1,783 $ 1,481 (1) Includes over-time revenue of $196 million and $47 million , and point-in-time revenue of $606 million and $616 million , for the six months ended September 30, 2024 and 2023, respectively. Revenue by geographic region is allocated to individual countries based on the principal headquarters of the customers. The geographical locations are not necessarily indicative of the country in which the customer sells products containing the Company’s technology IP. The following table summarizes information pertaining to revenue from customers based on the principal headquarters address by geographic regions: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 United States $ 292 $ 331 $ 850 $ 623 PRC (1) 193 178 321 319 Taiwan 155 166 270 281 Republic of Korea 76 62 139 107 Other countries 128 69 203 151 Total $ 844 $ 806 $ 1,783 $ 1,481 (1) “PRC” means the People’s Republic of China, including the Hong Kong Special Administrative Region and the Macau Special Administrative Region, but excluding Taiwan. Receivables A summary of the components of accounts receivable, net is as follows: As of (in millions) September 30, 2024 March 31, 2024 Trade receivables $ 617 $ 405 Royalty receivables 408 379 Total gross receivables 1,025 784 Allowance for current expected credit losses (19) (3) Total accounts receivables, net $ 1,006 $ 781 A summary of the movement in the allowance for current expected credit losses is as follows: (in millions) Total Balance as of March 31, 2024 $ 3 Additional provision 16 Balance as of September 30, 2024 $ 19 Contract Assets The timing of revenue recognition may differ from the timing of invoicing to customers. When revenue recognized exceeds the amount billed to the customer, the Company records a contract asset. Contract assets increased by $538.2 million and $663.9 million due to the timing of billings to customers, which fell into subsequent periods, as of September 30, 2024 and March 31, 2024, respectively, offset by $387.0 million and $357.4 million of contract assets transferred to accounts receivable, as of September 30, 2024 and March 31, 2024, respectively. The balance and activity for loss allowances related to contract assets was immaterial for all periods presented. Contract Liabilities A reconciliation of the movement in contract liabilities is as follows: (in millions) Total Balance as of March 31, 2024 $ 915 Customer prepayment and billing in advance of performance 180 Revenue recognized in the period that was included in the contract liability balance at the beginning of the period (98) Revenue recognized in the period that was included in the contract liability balance during the period (75) Balance as of September 30, 2024 $ 922 Satisfied Performance Obligations For the three months ended September 30, 2024 and 2023, revenue recognized from previously satisfied performance obligations in prior reporting periods was $516.5 million and $421.5 million , respectively. For the six months ended September 30, 2024 and 2023, revenue recognized from previously satisfied performance obligations in prior reporting periods was $987.3 million and $820.8 million , respectively. These amounts primarily represent royalties earned during the period. Remaining Performance Obligations Remaining performance obligations represent the transaction price allocated to performance obligations that are unsatisfied, or partially unsatisfied, which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods. The Company has elected to exclude potential future royalty receipts from the disclosure of remaining performance obligations. In certain arrangements, the Company’s right to consideration may not correspond directly with the performance of obligations. Revenue recognition for specified IP occurs upon delivery or beginning of license term, whichever is later. For certain subscription offerings, revenue allocated to unspecified future IP is recognized over-time, on a straight-line basis over the delivery period, commencing upon the later of the effective date of the arrangement and the transfer of the initial available IP license. As of September 30, 2024, the aggregate transaction price allocated to remaining performance obligations was $2,385.0 million and there were no non-cancellable or non-refundable committed funds received from certain customers, where the parties are in negotiations regarding the enforceable rights and obligations of the arrangement. The Company expects to recognize approximately 27% of the remaining performance obligations as revenue over the next 12 months, 16% over the subsequent 13-to 24-month period, and the remainder thereafter.

Equity Investments

Equity Investments	6 Months Ended
	Sep. 30, 2024
Investments, All Other Investments [Abstract]
Equity Investments	4 - Equity Investments A summary of the components of equity investments is as follows: As of (in millions) September 30, 2024 March 31, 2024 Equity method investments under fair value option $ 561 $ 573 Equity investment in publicly listed company 84 — Equity method investments under equity method 11 11 Non-marketable equity securities 140 157 Total equity investments $ 796 $ 741 Income (loss) from equity investments, net is as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Equity investment in publicly listed company $ 2 $ — $ 29 $ — Equity method investments (1) (12) (4) (12) (14) Non-marketable equity securities (includes NAV) — (1) (3) 2 Total income (loss) from equity investments, net $ (10) $ (5) $ 14 $ (12) (1) Includes equity method investments where the Company elected the fair value option, including those under the net asset value (“NAV”) practical expedient, along with investments accounted for under the equity method. Equity method investments under fair value option The Company elected the fair value option to account for certain equity method investments in Acetone Limited and Ampere Computing Holdings LLC (“Ampere”). See discussion below, along with Note 7 - Fair Value , for further information. The Company holds equity method investments in funds accounted for under the fair value option that apply the NAV practical expedient. The estimated fair values of the Company’s equity securities at fair value that qualify for the NAV practical expedient were provided by the funds based on the indicated market values of the underlying assets or investment portfolios. As of September 30, 2024 and March 31, 2024, the carrying value of equity method investments under the fair value option measured at NAV was $104.0 million and $106.2 million, respectively. For the three months ended September 30, 2024 and 2023 , the Company recognized gains and (losses) from changes in fair value of $(2.4) million and $2.1 million, respectively, for equity method investments accounted for under the NAV practical expedient. For the six months ended September 30, 2024 and 2023 , the Company recognized gains and (losses) from changes in fair value of $(2.8) million and $1.6 million, respectively, for equity method investments accounted for under the NAV practical expedient. Changes in fair value are recorded through income (loss) from equity investments, net in the Condensed Consolidated Income Statements. Acetone Limited As of September 30, 2024 and March 31, 2024 , the carrying value of the Company’s equity method investment in Acetone Limited was $67.5 million and $76.5 million , respectively . For the three months ended September 30, 2024 and 2023 , the Company recognized fair value losses of $9.0 million and $6.0 million, respectively, for its investment in Acetone Limited in income (loss) from equity investments, net in the Condensed Consolidated Income Statements . For the six months ended September 30, 2024 and 2023 , the Company recognized fair value losses of $9.0 million and $15.6 million , respectively, for its investment in Acetone Limited in income (loss) from equity investments, net in the Condensed Consolidated Income Statements . Ampere As of September 30, 2024 and March 31, 2024, the carrying value of the Company’s equity method investment in Ampere was $389.8 million . For the three and six months ended September 30, 2024 and 2023 , the Company did not recognize any fair value gains or losses for its investment in Ampere. As of September 30, 2024 and March 31, 2024, the outstanding balance of the convertible promissory note with Ampere was $33.1 million and $32.4 million, respectively, which is included in other non-current assets on the Condensed Consolidated Balance Sheets. The Company’s maximum exposure to loss is the amounts invested in, and advanced to, Ampere as of September 30, 2024. Equity investment in publicly listed company In June 2024, the Company purchased $35.3 million of Raspberry Pi Holdings plc’s (“Raspberry Pi”) ordinary shares in the initial public offering of Raspberry Pi, which is now a publicly listed company. As of September 30, 2024, the carrying value for this equity investment was $84.2 million, which included a pre-initial public offering investment carrying value of $20.0 million classified as non-marketable equity securities as of March 31, 2024. For the three and six months ended September 30, 2024, the Company recognized fair value gains of $1.9 million and $28.9 million, respectively, for its equity investment in Raspberry Pi in income (loss) from equity investments, net in the Condensed Consolidated Income Statements . Non-marketable Equity Securities Non-marketable securities are those for which the Company does not have significant influence or control. These represent either direct or indirect, through a capital fund, investments in unlisted early-stage development enterprises which are generating value for shareholders through research and development activities. The Company holds equity interests in certain funds which are accounted for under the NAV practical expedient. As of September 30, 2024 and March 31, 2024, the carrying value of assets measured at NAV was $16.3 million and $17.8 million, respectively. For the three months ended September 30, 2024 and 2023, the Company recognized gains and (losses) of $0.1 million and $(0.3) million, respectively, from changes in fair value for non-marketable securities accounted for under the NAV practical expedient. For the six months ended September 30, 2024 and 2023, the Company recognized gains and (losses) o f $(1.6) million and $2.2 million, respectively, from changes in fair value for non-marketable securities accounted for under the NAV practical expedient. In June 2023, the Company entered into a subscription letter with a subsidiary of SoftBank Vision Fund L.P. (“SoftBank Vision Fund”) and Kigen (UK) Limited (“Kigen”), an entity of which SoftBank Vision Fund indirectly owned 85% of the share capital on a fully diluted basis with the remainder comprising management incentives. Pursuant to the subscription letter, the Company and this subsidiary of SoftBank Vision Fund each invested $10.0 million paid in cash in exchange for preference shares of Kigen. During the three months ended September 30, 2024, the Company invested another $5.0 million in cash in exchange for preference shares of Kigen. As of September 30, 2024, the carrying value of the Company’s preference shares of Kigen was $15.0 million. The preference shares are convertible into common shares of Kigen and are entitled to full dividends, distribution and voting rights. The Company does not have significant influence or control over Kigen and elected to apply the measurement alternative for this investment. The Company elected to apply the measurement alternative to all other non-marketable equity securities. Under the measurement alternative, these equity securities are recorded at cost minus impairment, if any, plus or minus changes resulting from qualifying observable price changes in orderly transactions. The components of gains and (losses), which primarily include unrealized gains and losses on non-marketable securities inclusive of those measured under the NAV practical expedient, are as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Observable price adjustments on non-marketable equity securities (includes NAV) $ — $ (1) $ (2) $ 2 Impairment of non-marketable equity securities — — (1) — Total income (loss) from equity investments in non-marketable securities, net $ — $ (1) $ (3) $ 2 All equity method investments held by the Company are considered long-term to enable ecosystem growth and are classified as non-current assets. For the three months ended September 30, 2024 and 2023, the Company recognized $1.0 million and $1.8 million, respectiv ely, in dividends from equity investments measured using the NAV practical expedient. For the six months ended September 30, 2024 and 2023, the Company recognized $1.1 million and $2.1 million, respectively, in dividends from equity investments measured using the NAV practical expedient. The total amount of financial commitments to existing investees of the Company not provided for in the condensed consolidated financial statements was $19.1 million and $19.9 million as of September 30, 2024 and March 31, 2024, respectively .

Financial Instruments

Financial Instruments	6 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Financial Instruments	5 - Financial Instruments Loans and Other Receivables Loans and other receivables carried at amortized cost, included in other non-current assets on the Condensed Consolidated Balance Sheets, is as follows: As of (in millions) September 30, 2024 March 31, 2024 Loans and other receivables carried at amortized cost Loans receivable $ 27 $ 26 Other receivables 10 12 Allowance for current expected credit losses (20) (19) Loans and other receivables carried at amortized cost, net $ 17 $ 19 The allowance for current expected credit losses reflects the Company’s best estimate of expected credit losses of the receivables portfolio determined on the basis of historical experience, current information, and forecasts of future economic conditions. Loans receivable As of September 30, 2024 and March 31, 2024, the Company had a loan receivable of $16.4 million and $16.2 million, respectively, from Arduino SA (“Arduino”), a related party, that was fully impaired for the periods presented. As of September 30, 2024 and March 31, 2024, the Company had a four-year loan of $3.2 million and $3.1 million, respectively, issued to Cerfe Labs, Inc, a related party, that was fully impaired for the periods presented. The remaining balance of loans receivables as of September 30, 2024 and March 31, 2024 comprised two five-year loans totaling $7.4 million and $6.9 million, respectively, issued to Allia Limited. Other receivables As of September 30, 2024 and March 31, 2024, balances included in other receivables pertain to lease deposits and other receivables. Convertible Loans Receivable I n December 2021, the Company acquired a $29.0 million principal balance convertible loan in Ampere , which is included in other non-current assets on the Condensed Consolidated Balance Sheets . The Company elected the fair value option to measure this convertible loan receivable for which changes in fair value are recorded in other non-operating income (loss), net in the Condensed Consolidated Income Statements. For the three months ended September 30, 2024 , the Company did not recognize any gains on this convertible loan receivable. For the three months ended September 30, 2023 , the Company recognized gains on this convertible loan receivable of $1.0 million. For the six months ended September 30, 2024 and 2023 , the Company recognized gains on this convertible loan receivable of $1.0 million and $1.0 million , respectively .

Derivatives

Derivatives	6 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	6 - Derivatives The Company uses derivative financial instruments, specifically foreign currency forward contracts, to mitigate exposure from certain foreign currency risk. Certain forecasted transactions, specifically British Pound Sterling (“GBP”) denominated cash flows in the form of research and development and selling, general and administrative expenses are exposed to foreign currency risk. As of September 30, 2024 , the notional value of outstanding foreign currency forward contracts was £360.0 million and the fair value was $21.0 million . As of March 31, 2024, the notional value of outstanding foreign currency forward contracts was £728.0 million and the fair value was $0.1 million. The following table presents the notional amounts of the Company’s outstanding derivative instruments: As of (in millions) September 30, 2024 March 31, 2024 Designated as cash flow hedges Foreign currency forward contracts $ 461 $ 919 The following table presents the fair value of the Company’s outstanding derivative instruments: Derivative Assets Derivative Liabilities As of As of (in millions) September 30, March 31, September 30, March 31, Designated as cash flow hedges Foreign currency forward contracts $ 21 $ 4 $ — $ 4 Cash Flow Hedge Gains (Losses) The following table presents net gains (losses) on foreign currency forward contracts designated as cash flow hedges: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Condensed Consolidated Statements of Comprehensive Income: Change in gains (losses) recognized in accumulated other comprehensive income on cash flow hedge derivatives $ 29 $ (12) $ 25 $ (2) (Gains) losses reclassified from Accumulated other comprehensive income into income (10) (6) (5) (16) Income tax benefit (expense) on cash flow hedges (5) 4 (5) 4 Net change in fair value of the effective portion of designated cash flow hedges, net of tax (1) $ 14 $ (14) $ 15 $ (14) Condensed Consolidated Income Statements, before tax: Research and development $ 6 $ 3 $ 3 $ 9 Selling, general and administrative expenses $ 4 $ 3 $ 2 $ 7 (1) All amounts reported in accumulated other comprehensive income at the reporting date are expected to be reclassified into earnings within the next 18 months. For the three and six months ended September 30, 2024 and 2023, the Company’s cash flow hedges were highly effective with immaterial amounts of ineffectiveness recorded in the Condensed Consolidated Income Statements for these designated cash flow hedges, and all components of each derivative instrument’s gain or loss were included in the assessment of hedge effectiveness. The Company classifies foreign currency forward contract s as Level 2 fair value measurements pursuant to the fair value hierarchy. See Note 7 - Fair Value

Fair Value

Fair Value	6 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value	7 - Fair Value To provide an indication about the reliability of the inputs used in determining fair value, the Company classifies its fair value financial instruments into the three levels prescribed under GAAP. An explanation of each level follows the tables and qualitative disclosures below. The following table presents the Company’s fair value hierarchy for assets and liabilities measured and recognized at fair value, excluding investments where the NAV practical expedient has been elected, on a recurring basis: As of September 30, 2024 As of March 31, 2024 (in millions) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Financial assets Money market funds $ 1,378 $ — $ — $ 1,378 $ 1,744 $ — $ — $ 1,744 Short-term investments (1) 860 — — 860 1,000 — — 1,000 Equity investments (2) 84 — 457 541 — — 466 466 Convertible loans receivable — — 33 33 — — 32 32 Foreign currency forward contracts — 21 — 21 — 4 — 4 Total financial assets $ 2,322 $ 21 $ 490 $ 2,833 $ 2,744 $ 4 $ 498 $ 3,246 Financial liabilities Foreign currency forward contracts $ — $ — $ — $ — $ — $ 4 $ — $ 4 Total financial liabilities $ — $ — $ — $ — $ — $ 4 $ — $ 4 (1) Short-term investments represent term deposits with banks with a maturity between 3 and 12 months. (2) In accordance with Accounting Standards Codification (“ASC”) Subtopic 820-10, Fair Value Measurements, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy. In June 2024, Raspberry Pi, a company in which the Company has an equity investment, listed its shares publicly and became actively traded in the market. Given the investment now has a published price quotation in an active market, the investment no longer qualifies for the measurement alternative and the equity investment is now measured at fair value (Level 1) prospectively in accordance with ASC 820, Fair Value Measurements , as of the date of the remeasurement event, the initial public offering of Raspberry Pi. The following tables summarize changes in the fair value, along with other activity associated with the Company’s Level 3 financial assets and liabilities: Equity Method Investments Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Fair value of financial assets at the beginning of the period $ 466 $ 472 $ 466 $ 482 Fair value losses recognized in the Condensed Consolidated Income Statements (9) (6) (9) (16) Fair value at the end of the period $ 457 $ 466 $ 457 $ 466 Convertible Loans Receivable Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Fair value of financial assets at the beginning of the period $ 33 $ 31 $ 32 $ 31 Fair value gains recognized in the Condensed Consolidated Income Statements — 1 1 1 Fair value at the end of the period $ 33 $ 32 $ 33 $ 32 See below for a description of the valuation techniques and inputs used in the fair value measurement of Level 3 investments including equity method investments, convertible loans receivable, and currency exchange contracts. Equity Method Investments The Company elected the fair value option in accordance with the guidance in ASC 825, Financial Instruments (“ASC 825”), for its investments in Acetone Limited and Ampere. The Company initially computed the fair value for its investments consistent with the methodology and assumptions that market participants would use in their estimates of fair value with the assistance of a third-party valuation specialist or based on inputs from the investee. The fair value computation is updated on a quarterly basis. The investments are classified within Level 3 in the fair value hierarchy because the Company estimates the fair value of the investments using the (i) the market-calibration approach based on the guideline public company method, (ii) subject to availability of sufficient information, the income approach based on the discounted cash flow method, or (iii) the probability-weighted, expected return (“PWER”) approach. The market-calibration approach considers valuation multiples that are calibrated to the valuation as of the prior valuation date (i.e., quarterly) based on: (a) changes in the broader market or industry; (b) changes in the guideline public companies; and (c) changes in the investee’s operating and financial performance. The fair value computation under this approach includes a key assumption for the range of valuation multiples (i.e., enterprise value or revenue), which requires significant professional judgment by the valuation specialist and is based on observable inputs (e.g., market data) and unobservable inputs (e.g., market participant assumptions). The PWER approach is based on discrete future exit scenarios to determine the value of various equity securities. Under the PWER approach, the share value today is based on the probability-weighted, present value of expected future distributions, taking into account the rights and preferences of each debt and equity class. The Company considers an initial public offering scenario, a sale scenario, and a scenario assuming continued operation as a private entity for future exit scenarios. The fair value computation under this approach includes key assumptions for time to liquidity outcomes, discounted rate, and present value factors. The following tables provide quantitative information related to certain key assumptions utilized in the valuation of equity method investments accounted for under the fair value option: As of September 30, 2024 and March 31, 2024 (in millions) Fair value as of September 30, 2024 Fair value as of March 31, 2024 Valuation Technique Unobservable Inputs Range of Estimates Equity Method Investments $457 $466 Acetone Limited – Market-Calibration or discounted cash flow LTM Revenue Multiple 1.2x - 1.4x Ampere – PWER Probability of exit event 100% Time to future exit scenario 1.5 years Discount rate 17.6% Convertible Loans Receivable—Ampere In December 2021, the Company acquired a $29.0 million convertible promissory note in Ampere, which is included in other non-current assets on the Condensed Consolidated Balance Sheets. As of September 30, 2024 and March 31, 2024, the Company’s maximum exposure to loss is the amounts invested in, and advanced to, Ampere. As of September 30, 2024 and March 31, 2024, the Company has not converted any of its convertible promissory note into equity. The fair value of the Ampere convertible loan is based upon significant unobservable inputs, including the use of a probability weighted discounted cash flows model, requiring the Company to develop its own assumptions. Therefore, the Company has categorized this asset as a Level 3 financial asset. Some of the more significant unobservable inputs used in the fair value measurement of the convertible loan include applicable discount rates, the likelihood and projected timing of repayment or conversion, and projected cash flows in support of the estimated enterprise value of Ampere. Changes in these assumptions, while holding other inputs constant, could result in a significant change in the fair value of the convertible loan. If the amortized cost of the convertible loan exceeds its estimated fair value, the security is deemed to be impaired, and must be evaluated for the recognition of credit losses. Impairment resulting from credit losses is recognized within earnings, while impairment resulting from other factors is recognized in other comprehensive income (loss). As of September 30, 2024 and March 31, 2024, the Company has not recognized any credit losses related to this convertible loan. The fair value calculated using significant unobservable inputs did not differ materially from the amortized cost basis as of September 30, 2024 and March 31, 2024. Currency Exchange Contracts

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Shareholders' Equity	8 - Shareholders’ Equity Employee Benefit Trust In September 2023, the Company established the EBT, constituted by a trust deed entered into by the Company and a professional trustee, with the principal purpose to facilitate the efficient and flexible settlement of share-based compensation arrangements with employees. The Company has the power to appoint and remove the trustee and therefore, consolidates the trust. The EBT may acquire newly issued ordinary shares or American Depositary Shares (“ADSs”), each representing one ordinary share of the Company, at a nominal value or the trustee of the EBT has the power to acquire ordinary shares or ADSs of the Company in the open market, which purchases may be funded by one or more loans from the Company to the EBT or non-repayable gifts made by the Company to the EBT. As of September 30, 2024 and March 31, 2024, the EBT held a nominal number and 1 million, respectively, of ADSs purchased from the Company at par value. The market value of ADSs held by the EBT on September 30, 2024 and March 31, 2024 was $0.1 million and $75.4 million, respectively. These ADSs are expected to be transferred out of the EBT to settle future vestin g of share-based compensation for employees. As the EBT is consolidated by the Company, ordinary shares or ADSs held by the EBT are considered authorized and issued but not outstanding for the computation of earnings per share.

Share-based Compensation

Share-based Compensation	6 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Share-based Compensation	9 - Share-based Compensation Share-based Compensation RSUs and performance share units (“PSUs”) were granted to employees, certain executive officers, and non-executive directors of the Company and require continuous service through the vesting date. The Company expenses share-based compensation over the requisite service period of the awards, which is generally equivalent to the vesting term. Compensation cost is recorded only for those awards expected to vest. The fair value of RSUs is determined on the date of grant for equity-classified awards. The Company estimates forfeitures based on employee level, economic conditions, time remaining to vest and historical forfeiture experience. During the six months ended September 30, 2024, the Company has granted PSUs for the first time, with Relative Total Shareholder Return (“TSR”) as the performance measure under the Omnibus Incentive Plan (as defined below). PS Us granted with TSR as the performance measure are measured over the full three-year performance period relative to the S&P 500 IT Sector Index and have the potential to vest between 0% and 200% of the original award amount depending on the relative TSR achievement. To determine the grant date fair value of the awards with TSR-based performance measures, a Monte Carlo simulation model is used. We recognize compensation expense for the market-based TSR awards over the requisite service period based on the grant date fair value. Employee Stock Purchase Plan In August 2024 and September 2024, the Company’s Board of Directors adopted and the Company’s shareholders approved, respectively, the Company’s 2024 Employee Stock Purchase Plan (the “ESPP”). The maximum number of shares that may be granted under the ESPP is equal to the number of shares available for issuance under the Omnibus Incentive Plan, and each share granted under the ESPP reduces the number of shares available for issuance under the Omnibus Incentive Plan and its sub-plans by one share. The ESPP provides for one or more offering periods, and each offering will be for any period of between six ordinary shares or ADSs on the day before the offering period start date or (2) the fair market value of the ordinary shares or ADSs on the day before the purchase date at the end of the offering period. Employees may withdraw from the ESPP during specified periods and receive a full refund of accumulated payroll contributions. Employees who cease working at the Company during an offering period are treated as withdrawing from the ESPP. The Company expects the first purchase period under the ESPP to commence during the fiscal year ending March 31, 2025. As of September 30, 2024, no ordinary shares or ADSs have been purchased under the ESPP. Restricted Share Units – 2022 Arm Limited RSU Award Plan (“2022 RSU Plan”) The table below identifies the award activity under the 2022 RSU Plan: (in millions, except per share amounts) Awards (1) Weighted Average Grant Date Fair Value Per Award (1) Outstanding as of March 31, 2024 23 $ 42.30 Granted 1 $ 91.43 Vested (10) $ 42.54 Cancelled and forfeited (2) $ 41.36 Outstanding and expected to vest as of September 30, 2024 12 $ 44.23 (1) Awards and weighted average grant date per share exclude shares related to certain executive awards that currently have no grant date as the future performance objectives have not yet been defined and/or communicated to participants of the plan. As of September 30, 2024, there was $480.6 million total unrecognized compensation cost related to awards issued under the 2022 RSU Plan which are expected to be recognized over a weighted-average period of 0.7 years. Omnibus Incentive Plan In August 2023, the Company’s Board of Directors adopted the Omnibus Incentive Plan (the “Omnibus Incentive Plan”) which became effective in September 2023. The maximum number of ordinary shares that may be issued under the Omnibus Incentive Plan is equal to the sum of (i) 20,500,000 ordinary shares and (ii) an annual increase on April 1 of each year beginning on April 1, 2024 and ending on April 1, 2028, equal to the lesser of (A) 2% of the aggregate number of ordinary shares outstanding on March 31 of the immediately preceding fiscal year and (B) such smaller number of ordinary shares as determined by the Company’s Board of Directors or the Remuneration Committee. No more than 20,500,000 ordinary shares may be issued under the Omnibus Incentive Plan upon the exercise of incentive stock options. In October 2023, the Company started to grant RSUs and PSUs under the Omnibus Incentive Plan to employees, including executives of the Company. The RSUs and PSUs granted neither carry rights to dividends nor voting rights until the shares are issued or transferred to the recipient. The Omnibus Incentive Plan allows for either cash or share settlement of the awards by tranche, if applicable, at the discretion of the Remuneration Committee. At the time of issuance, the Company intended to settle the RSUs and PSUs in shares at the vesting date and such awards are accounted for as equity-classified awards. The RSUs were granted to existing employees and new hires of the Company and its subsidiaries, Arm Israel and Arm France SAS and vest in tranches, require continuous service through the vesting date and are subject to graded vesting over a period of three annual performance metrics. The portion of the PSUs that are subject to continuous service and are measured over the full three-year performance period to relative TSR have the potential to vest between 0% and 200% of the original award amount depending on the relative TSR achievement. The table below identifies all award activity under the Omnibus Incentive Plan: (in millions, except per share amounts) Awards (1) Weighted Average Grant Date Fair Value Per Award (1) Outstanding as of March 31, 2024 2 $ 68.13 Granted 10 $ 119.32 Vested (1) $ 56.53 Cancelled and forfeited — $ 111.43 Outstanding and expected to vest as of September 30, 2024 11 $ 113.20 (1) Awards and weighted average grant date per share exclude shares related to PSUs that currently have no grant date as the future performance objectives have not yet been defined and/or communicated to participants of the plan. As of September 30, 2024, there was $1,065.5 million total unrecognized compensation cost related to awards issued under the Omnibus Incentive Plan, which is expected to be recognized over a weighted-average period of 1.6 years. Share-based Compensation Cost A summary of share-based compensation cost recognized in the Condensed Consolidated Income Statements is as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Cost of sales $ 7 $ 20 $ 13 $ 26 Research and development 154 349 283 452 Selling, general and administrative 57 149 104 198 Pre-tax share-based compensation cost $ 218 $ 518 $ 400 $ 676 Less: income tax effect 30 41 42 70 Net share-based compensation cost $ 188 $ 477 $ 358 $ 606 No share-based compensation cost was capitalized for the three and six months ended September 30, 2024 and 2023.

Income Taxes

Income Taxes	6 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	10 - Income Taxes For the three months ended September 30, 2024 and 2023, income tax benefit (expense) was $43.0 million and $9.0 million, respectively. For the six months ended September 30, 2024 and 2023, income tax benefit (expense) was $22.0 million and $(13.0) million, respectively. For the three months ended September 30, 2024 and 2023, the income tax benefit (expense) as a percentage of income before taxes was 67.2% and (7.6)%, respectively. For the six months ended September 30, 2024 and 2023, the income tax benefit (expense) as a percentage of income before taxes was 7.1% and (162.5)%, respectively. The effective rate decreased compared to the same period last year primarily due to windfall tax benefits associated with share-based compensation arising in the three and six months ended September 30, 2024. Additionally, a $25.0 million contingency was released in the three months ended September 30, 2024, following the resolution of a tax inquiry. For the three months ended September 30, 2024 and 2023, the effective rate differed from the U.K. statutory rate of 25% in both periods, primarily due to patent box, research and development tax credits and the tax impact of share-based compensation cost. For the six months ended September 30, 2024 and 2023, the effective rate differed from the U.K. statutory rate of 25% in both periods, primarily due to patent box, research and development tax credits and the tax impact of share-based compensation cos t. As noted above there was also a $25.0 million release of a contingency provision in the three months ended September 30, 2024, following the resolution of a tax inquiry.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	11 - Net Income (Loss) Per Share The following table presents a reconciliation of basic and diluted earnings per share computations for all periods presented: Three Months Ended September 30, Six Months Ended September 30, (in millions, except per share amounts) 2024 2023 2024 2023 Numerator: Income (loss) attributable to ordinary shareholders — basic and diluted Net income (loss) $ 107 $ (110) $ 330 $ (5) Denominator: Weighted average ordinary shares used to calculate income (loss) per share — basic (1) 1,049 1,025 1,047 1,025 Equity-classified shared-based awards 14 — 14 — Weighted average ordinary shares used to calculate income (loss) per share — diluted 1,063 1,025 1,061 1,025 Income (loss) per share attributable to ordinary shareholders — basic Net income (loss) per ordinary share - basic $ 0.10 $ (0.11) $ 0.32 $ — Income (loss) per share attributable to ordinary shareholders — diluted Net income (loss) per ordinary share - diluted $ 0.10 $ (0.11) $ 0.31 $ — Securities excluded from diluted net income (loss) per ordinary share because their effect would have been anti-dilutive: Restricted share units (2) — 39 — 39 Performance share units (3) 1 1 1 1 Total 1 40 1 40 (1) For the three and six months ended September 30, 2023 , includes weighted average ordinary shares for vested securities without restrictions that were not issued and outstanding as of the end of the reporting period. (2) For the three and six months ended September 30, 2023, RSUs exclude certain awards which require cash settlement and do not allow for share settlement. (3) Prior to the IPO, certain executive awards entitled participants to fixed monetary amounts where the quantity of securities was calculated based on the total fixed monetary amount divided by the closing average market price of ordinary shares. Upon the IPO, these awards entitled participants to a fixed number of ordinary shares calculated based on the total fixed monetary amount divided by the IPO price.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	12 - Commitments and Contingencies Litigation From time to time, the Company is party to litigation and other legal proceedings in the ordinary course of business. Because the results of any litigation or other legal proceedings are uncertain, the Company’s financial position, results of operations or cash flows could be materially affected by an unfavorable resolution of one or more of these proceedings, claims, or demands. However, management does not currently believe the ultimate resolution of any pending legal matters is reasonably possible to have a material adverse effect on the Company’s financial position, results of operations or cash flows. The Company accrues for loss contingencies when it is both probable that it will incur the loss and when the Company can reasonably estimate the amount of the loss or range of loss. No material amounts related to litigation settlements were recognized in the three and six months ended September 30, 2024. For the three and six months ended September 30, 2023, the liability for litigation was reversed resulting in a reduction of selling, general and administrative expenses by $40.0 million due to a settlement agreement and no amount of cash was paid by the Company. Arduino Guarantee The Company is guarantor for a $5.6 million credit facility available to Arduino. As of September 30, 2024 and March 31, 2024, no claims have been made against the guaranty. The guaranty expires in January 2025.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Related Party Transactions	13 - Related Party Transactions Arm China and Acetone Limited Following the restructuring of its direct investment in Arm Technology (China) Co. Limited (“Arm China”) in the fiscal year ended March 31, 2022, the Company has a 10% non-voting ownership interest in Acetone Limited, whose primary asset is a 48.2% interest in Arm China. The Company has no direct material transactions with Acetone Limited. For the three months ended September 30, 2024 and 2023, the Company recognized revenue of $147.7 million and $162.0 million, re spectively, generated pursuant to arrangements under the terms of the intellectual property license agreement with Arm China (the “ IPLA”), and recognized expenses of $15.2 million an d $17.5 million, respectively, under a service share arrangement with Arm China. For the six months ended September 30, 2024 and 2023, the Company recognized revenue of $270.3 million and $300.9 million , respectively, generated pursuant to arrangements under the terms of the IPLA, and recognized expenses of $31.4 million and $33.6 million , respectively, under a service share arrangement with Arm China. The Company leases certain assets to Arm China. For the three months ended September 30, 2024 and 2023, rental income from the assets leased to Arm China was $0.3 million and $0.4 million , respectively, which is included within the recognized revenue. For the six months ended September 30, 2024 and 2023, rental income from the assets leased to Arm China was $0.7 million and $0.9 million , respectively, which is included within the recognized revenue. As of September 30, 2024, the Company had a net receivable of $168.9 million ( $179.5 million receivable less $10.6 million payable) from Arm China. As of March 31, 2024, the Company had a net receivable of $175.8 million ($181.1 million receivable less $5.3 million payable) from Arm China. As of September 30, 2024 and March 31, 2024, the Company had contract liabiliti es of $106.9 million and $105.7 million, respectively, relating to Arm China. For the three months ended September 30, 2024, the Company did not recognize any expected credit losses against earnings relating to Arm China. For the six months ended September 30, 2024, the Company recognized $16.0 million for expected credit losses against earnings relating to Arm China. For the three and six months ended September 30, 2023, the Company did not recognize any expected credit losses against earnings relating to Arm China. As of September 30, 2024 and March 31, 2024, the Company’s allowance for current expected credit losses related to Arm China was $16.0 million and $0.0 million, respectively, which is reflected in accounts receivable, net on the Condensed Consolidated Balance Sheets. See Note 4 - Equity Investments , for further details of the impact of Acetone Limited on the Company’s results. Other Entities Related by Virtue of Common Control by SoftBank Group The Company entered into related party transactions with an affiliate of SoftBank Group Corp. (collectively “SoftBank Group”) relating to a licensing and service arrangement. For the three and six months ended September 30, 2024 , revenue from SoftBank Group was $43.2 million. As of September 30, 2024, the Company had contract assets of $43.2 million and did not have any accounts receivable or contract liabilities from SoftBank Group . The Company had revenue transactions, along with accounts receivable, contract assets and contract liabilities balances, with other entities under common control by SoftBank Group. For the three and six months ended September 30, 2024, the Company did not recognize revenue from other entities controlled by SoftBank Group. For the three and six months ended September 30, 2023, the Company recognized revenue of $0.4 million and $0.6 million, respectively, from other entities controlled by SoftBank Group. As of September 30, 2024, the Company did not have any accounts receivable, contract assets or contract liabilities related to other entities contr olled by SoftBank Group. In August 2023, the Company distributed its receivable related to the Company’s sale of Pelion IOT Limited and its subsidiaries (“IoTP”) to the majority shareholder of the Company, which represented a non-cash distribution of $12.0 million . As of March 31, 2024, the Company had accounts receivable of $0.8 million, contract assets of $3.1 million, and contract liabilities of $1.6 million related to other entities controlled by SoftBank Group. The Company also had an immaterial lease with an entity under common control by SoftBank Group, which ended as of December 31, 2023. Other Equity Investments The Company has revenue transactions, along with receivable, contract asset and contract liability balances for certain other equity investees, for which the Company has significant influence or, for investments in limited partnerships or certain limited liability companies that maintain a specific ownership account for each investor, for which the Company has more than virtually no influence (i.e., at least 3% to 5% ownership) (such investees, “Significant Influence Investees”). For the three months ended September 30, 2024 and 2023, the Company recognized revenue of $0.6 million and $0.1 million , respectively, from Significant Influence I nvestees. For the six months ended September 30, 2024 and 2023, the Company recognized revenue of $2.0 million and $1.1 million , respectively, from Significant Influence I nvestees. As of September 30, 2024, the Company had contract assets and contract liabilities of $12.1 million and $0.2 million , respectively, related to contracts with Significant Influence Investees. As of September 30, 2024, the Company did not have accounts receivable with Significant influence investees. As of March 31, 2024, the Company had accounts receivable and contract assets of $0.2 million and $18.7 million, respectively, related to contracts with Significant Influence Investees. As of March 31, 2024, the Company did not have contract liabilities related to contracts with Significant Influence Investees. For the three months ended September 30, 2024 and 2023, the Company recognized aggregate distributions, dividends and returns of capital from certain equity investments of $1.0 million and $2.1 million , respectively. For the six months ended September 30, 2024 and 2023, the Company recognized aggregate distributions, dividends and returns of capital from certain equity investments of $1.3 million and $2.4 million , respectively. Linaro Limited Linaro Limited (“Linaro”) is a not-for-profit entity for which the Company is a member and has significant influence. For the three months ended September 30, 2024 and 2023, the Company incurred subscription and other costs of $3.0 million and $2.4 million, respectively, from Linaro. For the six months ended September 30, 2024 and 2023, the Company incurred subscription and other costs of $5.4 million and $4.7 million, respectively, from Linaro. As of September 30, 2024 and March 31, 2024, $1.1 million and $1.3 million, respectively, was recorded in o ther c urrent liabilities on the Condensed Consolidated Balance Sheets. In February 2023, the Company entered into an agreement with Linaro to sell certain net assets of the Company that meets the definition of a business in exchange for cash consideration of $4.0 million to be paid in equal annual installments over five years. As of September 30, 2024 and March 31, 2024, the total unpaid purchase consideration was $3.2 million , which was recorded in prepaid expenses and other current assets and other non-current assets on the Condensed Consolidated Balance Sheets. Loans to Related Parties As of September 30, 2024 and March 31, 2024, the Company had a loan receivable of $16.4 million and $16.2 million, respectively, with Arduino, a related party and a loan receivable of $3.2 million and $3.1 million , respectively, with Cerfe Labs, Inc, a related party, both of which remain fully impaired. See Note 5 - Financial Instruments , for further information regarding these loans. As of September 30, 2024 and March 31, 2024, the outstanding balance of the convertible promissory note with Ampere, a related party, was $33.1 million and $32.4 million, respectively. The Company’s maximum exposure to loss is the amounts invested in, and advanced to, Ampere as of September 30, 2024. See Note 4 - Equity Investments , for further details on Ampere.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the U.S. (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial information. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in the accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto as of and for the fiscal year ended March 31, 2024, in our Annual Report. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, consisting of only normal recurring adjustments, which are necessary for the fair statement of the unaudited condensed consolidated balance sheets, income statements, statements of comprehensive income, shareholders’ equity and cash flows for these interim periods. The results for the interim periods are not necessarily indicative of results for the full fiscal year.
Principles of Consolidation	Principles of Consolidation The accompanying financial statements include the accounts of the Company, its wholly owned subsidiaries and the Arm Employee Benefit Trust (the “EBT”). All intercompany balances and transactions have been eliminated in consolidation. The financial statements consolidate all of the Company’s affiliates, and the entities where the Company holds a controlling financial interest, because the Company holds a majority voting interest. The Company reevaluates whether there is a controlling financial interest in all entities when rights and interests change.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant items subject to such estimates include, but are not limited to, revenue recognition, allowance for expected credit losses, income taxes, share-based compensation, impairment considerations for long-lived assets, fair value estimates and impairment for investments. The Company evaluates these estimates on an ongoing basis and revises estimates as circumstances change. The Company bases its estimates on historical experience, anticipated results, trends, and other various assumptions that it believes are reasonable. Actual results could differ materially from the Company’s estimates.
Recently issued accounting pronouncements not yet adopted and Recently issued SEC final rules not yet adopted	Recently issued accounting pronouncements not yet adopted Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures: In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, which requires incremental reportable segment disclosures. The new standard requires that a public entity disclose significant segment expenses, the title and position of the chief operating decision maker (“CODM”), and how the CODM uses the reported measures in assessing performance and deciding how to allocate resources. ASU 2023-07 is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. Adoption of the ASU should be applied retrospectively to all prior periods presented in the financial statements. This ASU will result in additional required disclosures being included in our consolidated financial statements when adopted. The Company will adopt this standard in the annual financial statements for the fiscal year beginning April 1, 2024 and interim periods within the fiscal year beginning April 1, 2025. Income Taxes (Topic 740), Improvements to Income Tax Disclosures: In December 2023, the FASB issued ASU 2023-09, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as additional information on income taxes paid. The ASU is effective on a prospective basis for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. This ASU will likely result in additional required disclosures being included in our consolidated financial statements when adopted. The Company will adopt this standard for the fiscal year beginning April 1, 2025. Recently issued SEC final rules not yet adopted In March 2024, the SEC adopted final rules under SEC Release No. 33-11275, The Enhancement and Standardization of Climate-Related Disclosures for Investors , which requires a registrant to disclose climate-related risks that are reasonably likely to have a material impact on its business strategy, results of operations and financial condition. The rules include disclosures relating to climate-related risks and risk management, a registrant's governance of such risks, the financial impact on the audited financial statements, and greenhouse gas emissions. The disclosures will be required prospectively, with information for prior periods required only to the extent it was previously disclosed in an SEC filing. The earliest adoption date starts from the registrant's fiscal year beginning calendar 2025, which is the Company's fiscal year ending March 31, 2026. On April 4, 2024, the SEC determined to voluntarily stay the final rules pending certain legal challenges. The Company is currently evaluating the impact of the adoption of these final rules on its consolidated financial statements and disclosures.
Revenue Recognition	Revenue Recognition Revenue for the Company’s major product offerings consists of the following: License and Other Revenue • Intellectual property license — The Company generally licenses IP under non-exclusive license agreements that provide usage rights for specific applications for a finite or perpetual term. These licenses are made available electronically to address the customer-specific business requirements. These arrangements generally have distinct performance obligations that consist of transferring the licensed IPs, version extensions of architecture IP or releases of specified IPs, and support services. Support services consist of a stand-ready obligation to provide technical support, patches, and bug fixes over the support term. Revenue allocated to the IP license is recognized at a point in time upon the delivery or beginning of the license term, whichever is later. Revenue allocated to distinct version extensions of architecture IP or releases of specified IP, excluding when-and-if-available minor updates over the support term, are recognized at a point in time upon the delivery or beginning of license term, whichever is later. Certain license agreements provide customers with the right to access a library of current and future IPs on an unlimited basis over the contractual period depending on the terms of the applicable contract. These licensing arrangements represent stand-ready obligations in that the timing of the delivery of the underlying IPs is within the control of the customer and the extent of use in any given period does not diminish the remaining performance obligation. The contract consideration related to these arrangements is recognized ratably over the term of the contract in line with when the control of the performance obligations is transferred. Certain subscription license agreements include unspecified future IPs that are provided on a when-and-if-available basis, representing a stand-ready obligation. The contract consideration allocated to the stand-ready obligation is recognized on a ratable basis over the term of the contract, commencing upon the later of the effective date of the agreement and the transfer of the initial available IP license. • Software sales, including development systems — Sales of software, including development systems, which are not specifically designed for a given license (such as off-the-shelf software), are recognized upon delivery when control has been transferred and customer can begin to use and benefit from the license. • Professional services — Services (such as training, professional and design services) that the Company provides, which are not essential to the functionality of the IP, are separately stated and priced in the contract and accounted for separately. Training revenue is recognized as services are performed. Revenue from professional and design services are recognized over time using the input method based on engineering labor hours expended to date relative to the estimated total effort required. For such professional and design services, the Company has an enforceable right to payment for performance completed to date, which includes a reasonable profit margin and the performance of such services do not create an asset with an alternative use. In certain arrangements, the Company also provides customers with professional and design services, as a stand-ready obligation, that are recognized on a ratable basis over the term of the contract. • Support and maintenance — Support and maintenance is a stand-ready obligation to the customer that is both provided and consumed simultaneously. Revenue is recognized on a straight-line basis over the period for which support and maintenance is contractually agreed pursuant to the license. Royalty Revenue For most IP license agreements, royalties are collected on products that incorporate the Company’s IP. Royalties are recognized on an accrual basis in the quarter in which the customer ships their products, based on the Company’s technology that it contains. This estimation process for the royalty revenue accrual is based on a combination of methodologies, including the use of historical sales trends and macroeconomic factors for predictive analysis, the analysis of customer royalty reports and their sales trends and forecasts, as well as data and forecasts from third-party industry research providers. Data considered includes revenue, unit shipments, average selling price, product mix, market share and market penetration. Adjustments to revenue are required in subsequent periods to reflect changes in estimates as new information becomes available, primarily resulting from actual amounts subsequently reported by the licensees in the period following the accrual, including royalty audit resolutions. Remaining Performance Obligations Remaining performance obligations represent the transaction price allocated to performance obligations that are unsatisfied, or partially unsatisfied, which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods. The Company has elected to exclude potential future royalty receipts from the disclosure of remaining performance obligations. In certain arrangements, the Company’s right to consideration may not correspond directly with the performance of obligations. Revenue recognition for specified IP occurs upon delivery or beginning of license term, whichever is later. For certain subscription offerings, revenue allocated to unspecified future IP is recognized over-time, on a straight-line basis over the delivery period, commencing upon the later of the effective date of the arrangement and the transfer of the initial available IP license.
Equity Method Investments	Equity Method Investments The Company elected the fair value option in accordance with the guidance in ASC 825, Financial Instruments (“ASC 825”), for its investments in Acetone Limited and Ampere. The Company initially computed the fair value for its investments consistent with the methodology and assumptions that market participants would use in their estimates of fair value with the assistance of a third-party valuation specialist or based on inputs from the investee. The fair value computation is updated on a quarterly basis. The investments are classified within Level 3 in the fair value hierarchy because the Company estimates the fair value of the investments using the (i) the market-calibration approach based on the guideline public company method, (ii) subject to availability of sufficient information, the income approach based on the discounted cash flow method, or (iii) the probability-weighted, expected return (“PWER”) approach. The market-calibration approach considers valuation multiples that are calibrated to the valuation as of the prior valuation date (i.e., quarterly) based on: (a) changes in the broader market or industry; (b) changes in the guideline public companies; and (c) changes in the investee’s operating and financial performance. The fair value computation under this approach includes a key assumption for the range of valuation multiples (i.e., enterprise value or revenue), which requires significant professional judgment by the valuation specialist and is based on observable inputs (e.g., market data) and unobservable inputs (e.g., market participant assumptions). The PWER approach is based on discrete future exit scenarios to determine the value of various equity securities. Under the PWER approach, the share value today is based on the probability-weighted, present value of expected future distributions, taking into account the rights and preferences of each debt and equity class. The Company considers an initial public offering scenario, a sale scenario, and a scenario assuming continued operation as a private entity for future exit scenarios. The fair value computation under this approach includes key assumptions for time to liquidity outcomes, discounted rate, and present value factors.
Currency Exchange Contracts	Currency Exchange Contracts

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consist of: As of (in millions) September 30, 2024 March 31, 2024 Research and development tax credit receivables $ 107 $ 68 Prepayments 71 49 Other receivables 68 40 Total prepaid expenses and other current assets $ 246 $ 157
Schedule of Accrued Compensation and Benefits and Share-based Compensation	Accrued compensation and benefits consist of: As of (in millions) September 30, 2024 March 31, 2024 Accrued bonus, commissions, and cash awards $ 11 $ 190 Accrued vacation and sabbatical 84 83 Accrued salaries and fringe benefits 9 25 Total accrued compensation and benefits $ 104 $ 298
Schedule of Other Current Liabilities	Other current liabilities consist of: As of (in millions) September 30, 2024 March 31, 2024 Employee related payroll taxes and payables (1) $ 192 $ 674 Accrued expenses and fees 105 83 Electronic design automation liabilities 57 40 Trade payables (including payables to related parties of $12 and $7 as of September 30, 2024 and March 31, 2024, respectively) 34 26 Customer deposits 7 7 Finance lease liabilities 5 5 Total other current liabilities $ 400 $ 835 (1) Employee related payroll taxes and payables are primarily related to vested RSUs during the quarter and paid in the subsequent quarter.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	A summary of the Company’s disaggregated revenue is as follows: Three Months Ended September 30, External Customers Related Parties Total (in millions) 2024 2023 2024 2023 2024 2023 License and Other Revenue (1) $ 240 $ 294 $ 90 $ 94 $ 330 $ 388 Royalty Revenue 412 350 102 68 514 418 $ 652 $ 644 $ 192 $ 162 $ 844 $ 806 (1) Includes over-time revenue of $120 million and $30 million , and point-in-time revenue of $210 million and $358 million , for the three months ended September 30, 2024 and 2023, respectively. Six Months Ended September 30, External Customers Related Parties Total (in millions) 2024 2023 2024 2023 2024 2023 License and Other Revenue (1) $ 681 $ 474 $ 121 $ 189 $ 802 $ 663 Royalty Revenue 786 705 195 113 981 818 $ 1,467 $ 1,179 $ 316 $ 302 $ 1,783 $ 1,481 (1) Includes over-time revenue of $196 million and $47 million , and point-in-time revenue of $606 million and $616 million , for the six months ended September 30, 2024 and 2023, respectively.
Schedule of Revenue from External Customers by Geographic Areas	The following table summarizes information pertaining to revenue from customers based on the principal headquarters address by geographic regions: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 United States $ 292 $ 331 $ 850 $ 623 PRC (1) 193 178 321 319 Taiwan 155 166 270 281 Republic of Korea 76 62 139 107 Other countries 128 69 203 151 Total $ 844 $ 806 $ 1,783 $ 1,481 (1) “PRC” means the People’s Republic of China, including the Hong Kong Special Administrative Region and the Macau Special Administrative Region, but excluding Taiwan.
Schedule of Accounts Receivable	A summary of the components of accounts receivable, net is as follows: As of (in millions) September 30, 2024 March 31, 2024 Trade receivables $ 617 $ 405 Royalty receivables 408 379 Total gross receivables 1,025 784 Allowance for current expected credit losses (19) (3) Total accounts receivables, net $ 1,006 $ 781
Schedule of Allowance for Credit Losses	A summary of the movement in the allowance for current expected credit losses is as follows: (in millions) Total Balance as of March 31, 2024 $ 3 Additional provision 16 Balance as of September 30, 2024 $ 19
Schedule of Reconciliation of Contract Liabilities	A reconciliation of the movement in contract liabilities is as follows: (in millions) Total Balance as of March 31, 2024 $ 915 Customer prepayment and billing in advance of performance 180 Revenue recognized in the period that was included in the contract liability balance at the beginning of the period (98) Revenue recognized in the period that was included in the contract liability balance during the period (75) Balance as of September 30, 2024 $ 922

Equity Investments (Tables)

Equity Investments (Tables)	6 Months Ended
	Sep. 30, 2024
Investments, All Other Investments [Abstract]
Schedule of Equity Investments	A summary of the components of equity investments is as follows: As of (in millions) September 30, 2024 March 31, 2024 Equity method investments under fair value option $ 561 $ 573 Equity investment in publicly listed company 84 — Equity method investments under equity method 11 11 Non-marketable equity securities 140 157 Total equity investments $ 796 $ 741 Income (loss) from equity investments, net is as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Equity investment in publicly listed company $ 2 $ — $ 29 $ — Equity method investments (1) (12) (4) (12) (14) Non-marketable equity securities (includes NAV) — (1) (3) 2 Total income (loss) from equity investments, net $ (10) $ (5) $ 14 $ (12) (1) Includes equity method investments where the Company elected the fair value option, including those under the net asset value (“NAV”) practical expedient, along with investments accounted for under the equity method.
Schedule of Unrealized Gain (Loss) on Investments	The components of gains and (losses), which primarily include unrealized gains and losses on non-marketable securities inclusive of those measured under the NAV practical expedient, are as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Observable price adjustments on non-marketable equity securities (includes NAV) $ — $ (1) $ (2) $ 2 Impairment of non-marketable equity securities — — (1) — Total income (loss) from equity investments in non-marketable securities, net $ — $ (1) $ (3) $ 2
Schedule of Realized Gain (Loss) on Investments	The components of gains and (losses), which primarily include unrealized gains and losses on non-marketable securities inclusive of those measured under the NAV practical expedient, are as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Observable price adjustments on non-marketable equity securities (includes NAV) $ — $ (1) $ (2) $ 2 Impairment of non-marketable equity securities — — (1) — Total income (loss) from equity investments in non-marketable securities, net $ — $ (1) $ (3) $ 2

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Schedule of Loans and Other Receivables Carried at Amortized Cost	Loans and other receivables carried at amortized cost, included in other non-current assets on the Condensed Consolidated Balance Sheets, is as follows: As of (in millions) September 30, 2024 March 31, 2024 Loans and other receivables carried at amortized cost Loans receivable $ 27 $ 26 Other receivables 10 12 Allowance for current expected credit losses (20) (19) Loans and other receivables carried at amortized cost, net $ 17 $ 19

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following table presents the notional amounts of the Company’s outstanding derivative instruments: As of (in millions) September 30, 2024 March 31, 2024 Designated as cash flow hedges Foreign currency forward contracts $ 461 $ 919
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value of the Company’s outstanding derivative instruments: Derivative Assets Derivative Liabilities As of As of (in millions) September 30, March 31, September 30, March 31, Designated as cash flow hedges Foreign currency forward contracts $ 21 $ 4 $ — $ 4
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following table presents net gains (losses) on foreign currency forward contracts designated as cash flow hedges: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Condensed Consolidated Statements of Comprehensive Income: Change in gains (losses) recognized in accumulated other comprehensive income on cash flow hedge derivatives $ 29 $ (12) $ 25 $ (2) (Gains) losses reclassified from Accumulated other comprehensive income into income (10) (6) (5) (16) Income tax benefit (expense) on cash flow hedges (5) 4 (5) 4 Net change in fair value of the effective portion of designated cash flow hedges, net of tax (1) $ 14 $ (14) $ 15 $ (14) Condensed Consolidated Income Statements, before tax: Research and development $ 6 $ 3 $ 3 $ 9 Selling, general and administrative expenses $ 4 $ 3 $ 2 $ 7 (1) All amounts reported in accumulated other comprehensive income at the reporting date are expected to be reclassified into earnings within the next 18 months.

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents the Company’s fair value hierarchy for assets and liabilities measured and recognized at fair value, excluding investments where the NAV practical expedient has been elected, on a recurring basis: As of September 30, 2024 As of March 31, 2024 (in millions) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Financial assets Money market funds $ 1,378 $ — $ — $ 1,378 $ 1,744 $ — $ — $ 1,744 Short-term investments (1) 860 — — 860 1,000 — — 1,000 Equity investments (2) 84 — 457 541 — — 466 466 Convertible loans receivable — — 33 33 — — 32 32 Foreign currency forward contracts — 21 — 21 — 4 — 4 Total financial assets $ 2,322 $ 21 $ 490 $ 2,833 $ 2,744 $ 4 $ 498 $ 3,246 Financial liabilities Foreign currency forward contracts $ — $ — $ — $ — $ — $ 4 $ — $ 4 Total financial liabilities $ — $ — $ — $ — $ — $ 4 $ — $ 4 (1) Short-term investments represent term deposits with banks with a maturity between 3 and 12 months. (2) In accordance with Accounting Standards Codification (“ASC”) Subtopic 820-10, Fair Value Measurements, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.
Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following tables summarize changes in the fair value, along with other activity associated with the Company’s Level 3 financial assets and liabilities: Equity Method Investments Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Fair value of financial assets at the beginning of the period $ 466 $ 472 $ 466 $ 482 Fair value losses recognized in the Condensed Consolidated Income Statements (9) (6) (9) (16) Fair value at the end of the period $ 457 $ 466 $ 457 $ 466 Convertible Loans Receivable Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Fair value of financial assets at the beginning of the period $ 33 $ 31 $ 32 $ 31 Fair value gains recognized in the Condensed Consolidated Income Statements — 1 1 1 Fair value at the end of the period $ 33 $ 32 $ 33 $ 32
Schedule of Fair Value Measurement Inputs and Valuation Techniques	The following tables provide quantitative information related to certain key assumptions utilized in the valuation of equity method investments accounted for under the fair value option: As of September 30, 2024 and March 31, 2024 (in millions) Fair value as of September 30, 2024 Fair value as of March 31, 2024 Valuation Technique Unobservable Inputs Range of Estimates Equity Method Investments $457 $466 Acetone Limited – Market-Calibration or discounted cash flow LTM Revenue Multiple 1.2x - 1.4x Ampere – PWER Probability of exit event 100% Time to future exit scenario 1.5 years Discount rate 17.6%

Share-based Compensation (Table

Share-based Compensation (Tables)	6 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	The table below identifies the award activity under the 2022 RSU Plan: (in millions, except per share amounts) Awards (1) Weighted Average Grant Date Fair Value Per Award (1) Outstanding as of March 31, 2024 23 $ 42.30 Granted 1 $ 91.43 Vested (10) $ 42.54 Cancelled and forfeited (2) $ 41.36 Outstanding and expected to vest as of September 30, 2024 12 $ 44.23 (1)
Schedule of Share-Based Payment Arrangement, Restricted Stock Units And Performance Shares, Activity	The table below identifies all award activity under the Omnibus Incentive Plan: (in millions, except per share amounts) Awards (1) Weighted Average Grant Date Fair Value Per Award (1) Outstanding as of March 31, 2024 2 $ 68.13 Granted 10 $ 119.32 Vested (1) $ 56.53 Cancelled and forfeited — $ 111.43 Outstanding and expected to vest as of September 30, 2024 11 $ 113.20 (1) Awards and weighted average grant date per share exclude shares related to PSUs that currently have no grant date as the future performance objectives have not yet been defined and/or communicated to participants of the plan.
Schedule of Share-Based Payment Arrangement, Expensed and Capitalized, Amount	A summary of share-based compensation cost recognized in the Condensed Consolidated Income Statements is as follows: Three Months Ended September 30, Six Months Ended September 30, (in millions) 2024 2023 2024 2023 Cost of sales $ 7 $ 20 $ 13 $ 26 Research and development 154 349 283 452 Selling, general and administrative 57 149 104 198 Pre-tax share-based compensation cost $ 218 $ 518 $ 400 $ 676 Less: income tax effect 30 41 42 70 Net share-based compensation cost $ 188 $ 477 $ 358 $ 606

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents a reconciliation of basic and diluted earnings per share computations for all periods presented: Three Months Ended September 30, Six Months Ended September 30, (in millions, except per share amounts) 2024 2023 2024 2023 Numerator: Income (loss) attributable to ordinary shareholders — basic and diluted Net income (loss) $ 107 $ (110) $ 330 $ (5) Denominator: Weighted average ordinary shares used to calculate income (loss) per share — basic (1) 1,049 1,025 1,047 1,025 Equity-classified shared-based awards 14 — 14 — Weighted average ordinary shares used to calculate income (loss) per share — diluted 1,063 1,025 1,061 1,025 Income (loss) per share attributable to ordinary shareholders — basic Net income (loss) per ordinary share - basic $ 0.10 $ (0.11) $ 0.32 $ — Income (loss) per share attributable to ordinary shareholders — diluted Net income (loss) per ordinary share - diluted $ 0.10 $ (0.11) $ 0.31 $ — Securities excluded from diluted net income (loss) per ordinary share because their effect would have been anti-dilutive: Restricted share units (2) — 39 — 39 Performance share units (3) 1 1 1 1 Total 1 40 1 40 (1) For the three and six months ended September 30, 2023 , includes weighted average ordinary shares for vested securities without restrictions that were not issued and outstanding as of the end of the reporting period. (2) For the three and six months ended September 30, 2023, RSUs exclude certain awards which require cash settlement and do not allow for share settlement. (3) Prior to the IPO, certain executive awards entitled participants to fixed monetary amounts where the quantity of securities was calculated based on the total fixed monetary amount divided by the closing average market price of ordinary shares. Upon the IPO, these awards entitled participants to a fixed number of ordinary shares calculated based on the total fixed monetary amount divided by the IPO price.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following table presents a reconciliation of basic and diluted earnings per share computations for all periods presented: Three Months Ended September 30, Six Months Ended September 30, (in millions, except per share amounts) 2024 2023 2024 2023 Numerator: Income (loss) attributable to ordinary shareholders — basic and diluted Net income (loss) $ 107 $ (110) $ 330 $ (5) Denominator: Weighted average ordinary shares used to calculate income (loss) per share — basic (1) 1,049 1,025 1,047 1,025 Equity-classified shared-based awards 14 — 14 — Weighted average ordinary shares used to calculate income (loss) per share — diluted 1,063 1,025 1,061 1,025 Income (loss) per share attributable to ordinary shareholders — basic Net income (loss) per ordinary share - basic $ 0.10 $ (0.11) $ 0.32 $ — Income (loss) per share attributable to ordinary shareholders — diluted Net income (loss) per ordinary share - diluted $ 0.10 $ (0.11) $ 0.31 $ — Securities excluded from diluted net income (loss) per ordinary share because their effect would have been anti-dilutive: Restricted share units (2) — 39 — 39 Performance share units (3) 1 1 1 1 Total 1 40 1 40 (1) For the three and six months ended September 30, 2023 , includes weighted average ordinary shares for vested securities without restrictions that were not issued and outstanding as of the end of the reporting period. (2) For the three and six months ended September 30, 2023, RSUs exclude certain awards which require cash settlement and do not allow for share settlement. (3) Prior to the IPO, certain executive awards entitled participants to fixed monetary amounts where the quantity of securities was calculated based on the total fixed monetary amount divided by the closing average market price of ordinary shares. Upon the IPO, these awards entitled participants to a fixed number of ordinary shares calculated based on the total fixed monetary amount divided by the IPO price.

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Research and development tax credit receivables	$ 107	$ 68
Prepayments	71	49
Other receivables	68	40
Total prepaid expenses and other current assets	$ 246	$ 157

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Accrued Compensation and Benefits and Share-based Compensation (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued bonus, commissions, and cash awards	$ 11	$ 190
Accrued vacation and sabbatical	84	83
Accrued salaries and fringe benefits	9	25
Total accrued compensation and benefits	$ 104	$ 298

Balance Sheet Components - Sc_3

Balance Sheet Components - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Other Current Liabilities [Line Items]
Employee related payroll taxes and payables	$ 192	$ 674
Accrued expenses and fees	105	83
Electronic design automation liabilities	57	40
Trade payables	34	26
Customer deposits	7	7
Finance lease liabilities	5	5
Total other current liabilities	400	835
Related Parties
Other Current Liabilities [Line Items]
Trade payables	12	7
Total other current liabilities	$ 12	$ 7

Revenue - Schedule of Disaggreg

Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 844	$ 806	$ 1,783	$ 1,481
Over-time revenues
Disaggregation of Revenue [Line Items]
Revenue	120	30	196	47
Point-in-time revenues
Disaggregation of Revenue [Line Items]
Revenue	210	358	606	616
External Customers
Disaggregation of Revenue [Line Items]
Revenue	652	644	1,467	1,179
Related Parties
Disaggregation of Revenue [Line Items]
Revenue	192	162	316	302
License and Other Revenue
Disaggregation of Revenue [Line Items]
Revenue	330	388	802	663
License and Other Revenue | External Customers
Disaggregation of Revenue [Line Items]
Revenue	240	294	681	474
License and Other Revenue | Related Parties
Disaggregation of Revenue [Line Items]
Revenue	90	94	121	189
Royalty Revenue
Disaggregation of Revenue [Line Items]
Revenue	514	418	981	818
Royalty Revenue | External Customers
Disaggregation of Revenue [Line Items]
Revenue	412	350	786	705
Royalty Revenue | Related Parties
Disaggregation of Revenue [Line Items]
Revenue	$ 102	$ 68	$ 195	$ 113

Revenue - Schedule of Revenue b

Revenue - Schedule of Revenue by Geographical Location (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 844	$ 806	$ 1,783	$ 1,481
United States
Disaggregation of Revenue [Line Items]
Revenue	292	331	850	623
PRC
Disaggregation of Revenue [Line Items]
Revenue	193	178	321	319
Taiwan
Disaggregation of Revenue [Line Items]
Revenue	155	166	270	281
Republic of Korea
Disaggregation of Revenue [Line Items]
Revenue	76	62	139	107
Other countries
Disaggregation of Revenue [Line Items]
Revenue	$ 128	$ 69	$ 203	$ 151

Revenue - Schedule of Accounts

Revenue - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 1,025	$ 784
Allowance for current expected credit losses	(19)	(3)
Total accounts receivables, net	1,006	781
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	617	405
Royalty receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 408	$ 379

Revenue - Schedule of Account_2

Revenue - Schedule of Accounts Receivable, Credit Loss (Details) $ in Millions	6 Months Ended
	Sep. 30, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 3
Additional provision	16
Ending balance	$ 19

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Increase in contract with customer, asset			$ 538.2		$ 663.9
Contract assets, transfer to accounts receivable			387		$ 357.4
Performance obligation satisfied in previous period	$ 516.5	$ 421.5	$ 987.3	$ 820.8

Revenue - Schedule of Contract

Revenue - Schedule of Contract Liabilities (Details) $ in Millions	6 Months Ended
	Sep. 30, 2024 USD ($)
Contract With Customers, Liability [Roll Forward]
Beginning balance	$ 915
Customer prepayment and billing in advance of performance	180
Revenue recognized in the period that was included in the contract liability balance at the beginning of the period	(98)
Revenue recognized in the period that was included in the contract liability balance during the period	(75)
Ending balance	$ 922

Revenue - Remaining Performance

Revenue - Remaining Performance Obligations (Details)	Sep. 30, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, amount	$ 2,385,000,000
Non-Cancellable And Non-Refundable Committed Funds
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percent	27%
Remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percent	16%
Remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, period

Equity Investments - Schedule o

Equity Investments - Schedule of Equity Investments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Investments, All Other Investments [Abstract]
Equity method investments under fair value option	$ 561	$ 573
Equity investment in publicly listed company	84	0
Equity method investments under equity method	11	11
Non-marketable equity securities	140	157
Total equity investments	$ 796	$ 741

Equity Investments - Schedule_2

Equity Investments - Schedule of Income (Loss) from Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, All Other Investments [Abstract]
Equity investment in publicly listed company	$ 2	$ 0	$ 29	$ 0
Equity method investments	(12)	(4)	(12)	(14)
Non-marketable equity securities (includes NAV)	0	(1)	(3)	2
Total income (loss) from equity investments, net	$ (10)	$ (5)	$ 14	$ (12)

Equity Investments - Narrative

Equity Investments - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Schedule of Equity Method Investments [Line Items]
Equity method investments under fair value option			$ 561,000,000		$ 561,000,000		$ 573,000,000
Gains (losses) on equity method investments			(12,000,000)	$ (4,000,000)	(12,000,000)	$ (14,000,000)
Equity method investments under equity method			11,000,000		11,000,000		11,000,000
Other non-current assets			254,000,000		254,000,000		270,000,000
Equity investment in publicly listed company			84,000,000		84,000,000		0
Non-marketable equity securities			140,000,000		140,000,000		157,000,000
Recognized gain from change in fair value for equity investment			2,000,000	0	29,000,000	0
Non-marketable equity securities (includes NAV)			0	(1,000,000)	(3,000,000)	2,000,000
Payments to acquire non-marketable preferred stock					41,000,000	11,000,000
Dividends from equity investments			1,000,000	1,800,000	1,100,000	2,100,000
Financial commitments to investees, off balance sheet			19,100,000		19,100,000		19,900,000
Kigen (UK) Limited
Schedule of Equity Method Investments [Line Items]
Non-marketable equity securities			15,000,000		15,000,000
Payments to acquire non-marketable preferred stock		$ 10,000,000	5,000,000
Kigen (UK) Limited | SoftBank Vision Fund
Schedule of Equity Method Investments [Line Items]
Ownership percentage		85%
Ampere | Loans receivable
Schedule of Equity Method Investments [Line Items]
Other non-current assets			33,100,000		33,100,000		32,400,000
Acetone Limited
Schedule of Equity Method Investments [Line Items]
Gains (losses) on equity method investments			(9,000,000)	(6,000,000)	(9,000,000)	(15,600,000)
Equity method investments under equity method			67,500,000		67,500,000		76,500,000
Ampere
Schedule of Equity Method Investments [Line Items]
Gains (losses) on equity method investments			0	0	0	0
Equity method investments under equity method			389,800,000		389,800,000		389,800,000
Raspberry Pi Holdings plc’s
Schedule of Equity Method Investments [Line Items]
Purchase of ordinary shares	$ 35,300,000
Equity investment in publicly listed company			84,200,000		84,200,000
Non-marketable equity securities							20,000,000
Recognized gain from change in fair value for equity investment			1,900,000		28,900,000
Fair Value Measured at Net Asset Value Per Share
Schedule of Equity Method Investments [Line Items]
Equity method investments under fair value option			104,000,000		104,000,000		106,200,000
Gains (losses) on equity method investments			(2,400,000)	2,100,000	(2,800,000)	1,600,000
Non-marketable equity securities			16,300,000		16,300,000		$ 17,800,000
Non-marketable equity securities (includes NAV)			$ 100,000	$ (300,000)	$ (1,600,000)	$ 2,200,000

Equity Investments - Schedule_3

Equity Investments - Schedule of Gains (Losses) on Non-Marketable Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, All Other Investments [Abstract]
Observable price adjustments on non-marketable equity securities (includes NAV)	$ 0	$ (1)	$ (2)	$ 2
Impairment of non-marketable equity securities	0	0	(1)	0
Total income (loss) from equity investments in non-marketable securities, net	$ 0	$ (1)	$ (3)	$ 2

Financial Instruments - Schedul

Financial Instruments - Schedule of Loans and Other Receivables Carried at Amortized Cost (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for current expected credit losses	$ (20)	$ (19)
Loans and other receivables carried at amortized cost, net	17	19
Loans receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and other receivables carried at amortized cost	27	26
Other receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and other receivables carried at amortized cost	$ 10	$ 12

Financial Instruments - Narrati

Financial Instruments - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Impaired loan receivable	$ 20,000,000		$ 20,000,000		$ 19,000,000
Level 3
Financing Receivable, Allowance for Credit Loss [Line Items]
Convertible loans receivable	33,000,000		33,000,000		32,000,000
Convertible loans receivable | Level 3
Financing Receivable, Allowance for Credit Loss [Line Items]
Fair value losses recognized in the Condensed Consolidated Income Statements	0	$ 1,000,000	1,000,000	$ 1,000,000
Loans receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and other receivables carried at amortized cost	27,000,000		27,000,000		26,000,000
Arduino
Financing Receivable, Allowance for Credit Loss [Line Items]
Impaired loan receivable	$ 16,400,000		$ 16,400,000		$ 16,200,000
Cerfe Labs, Inc. | Loans receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan term	4 years		4 years		4 years
Loans and other receivables carried at amortized cost	$ 3,200,000		$ 3,200,000		$ 3,100,000
Allia Limited | Loans receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan term	5 years		5 years		5 years
Loans and other receivables carried at amortized cost	$ 7,400,000		$ 7,400,000		$ 6,900,000
Ampere
Financing Receivable, Allowance for Credit Loss [Line Items]
Convertible loans receivable						$ 29,000,000
Ampere | Convertible loans receivable | Level 3
Financing Receivable, Allowance for Credit Loss [Line Items]
Fair value losses recognized in the Condensed Consolidated Income Statements	$ 0	$ 1,000,000	$ 1,000,000	$ 1,000,000

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) £ in Millions, $ in Millions	Sep. 30, 2024 GBP (£)	Sep. 30, 2024 USD ($)	Mar. 31, 2024 GBP (£)	Mar. 31, 2024 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, notional amount | £	£ 360		£ 728
Derivative, fair value | $		$ 21		$ 0.1

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Instruments (Details) £ in Millions, $ in Millions	Sep. 30, 2024 GBP (£)	Sep. 30, 2024 USD ($)	Mar. 31, 2024 GBP (£)	Mar. 31, 2024 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount | £	£ 360		£ 728
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount | $		$ 461		$ 919

Derivatives - Schedule of Der_2

Derivatives - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - Level 3 - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	$ 0	$ 0
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	21	4
Derivative Liabilities	$ 0	$ 4

Derivatives - Schedule of Cash

Derivatives - Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
Change in gains (losses) recognized in accumulated other comprehensive income on cash flow hedge derivatives	$ 29	$ (12)	$ 25	$ (2)
(Gains) losses reclassified from Accumulated other comprehensive income into income	(10)	(6)	(5)	(16)
Income tax benefit (expense) on cash flow hedges	(5)	4	(5)	4
Net change in fair value of the effective portion of designated cash flow hedges, net of tax	14	(14)	15	(14)
Research and development
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
(Gains) losses reclassified from Accumulated other comprehensive income into income	(6)	(3)	(3)	(9)
Selling, general and administrative expenses
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
(Gains) losses reclassified from Accumulated other comprehensive income into income	$ (4)	$ (3)	$ (2)	$ (7)

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Financial assets
Short-term investments	$ 860	$ 1,000
Equity investments	561	573
Fair Value, Recurring
Financial liabilities
Foreign currency forward contracts	0	4
Total financial liabilities	0	4
Fair Value, Inputs, Level 1, Level 2, and Level 3
Financial assets
Money market funds	1,378	1,744
Short-term investments	860	1,000
Equity investments	541	466
Convertible loans receivable	33	32
Foreign currency forward contracts	21	4
Total financial assets	2,833	3,246
Level 1
Financial assets
Money market funds	1,378	1,744
Short-term investments	860	1,000
Equity investments	84	0
Convertible loans receivable	0	0
Foreign currency forward contracts	0	0
Total financial assets	2,322	2,744
Level 1 | Fair Value, Recurring
Financial liabilities
Foreign currency forward contracts	0	0
Total financial liabilities	0	0
Level 2
Financial assets
Money market funds	0	0
Short-term investments	0	0
Equity investments	0	0
Convertible loans receivable	0	0
Foreign currency forward contracts	21	4
Total financial assets	21	4
Level 2 | Fair Value, Recurring
Financial liabilities
Foreign currency forward contracts	0	4
Total financial liabilities	0	4
Level 3
Financial assets
Money market funds	0	0
Short-term investments	0	0
Equity investments	457	466
Convertible loans receivable	33	32
Foreign currency forward contracts	0	0
Total financial assets	490	498
Level 3 | Fair Value, Recurring
Financial liabilities
Foreign currency forward contracts	0	0
Total financial liabilities	$ 0	$ 0

Fair Value - Schedule of Change

Fair Value - Schedule of Changes in Fair Value of Level 3 Financial Assets and Liabilities (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity Method Investments, Fair Value Option
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of financial assets at the beginning of the period	$ 466	$ 472	$ 466	$ 482
Fair value gains (losses) recognized in the Condensed Consolidated Income Statements	(9)	(6)	(9)	(16)
Fair value at the end of the period	457	466	457	466
Convertible loans receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of financial assets at the beginning of the period	33	31	32	31
Fair value gains (losses) recognized in the Condensed Consolidated Income Statements	0	1	1	1
Fair value at the end of the period	$ 33	$ 32	$ 33	$ 32

Fair Value - Schedule of Equity

Fair Value - Schedule of Equity Method Investments Key Assumptions (Details) $ in Millions	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 561	$ 573
Level 3
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 457	$ 466
Level 3 | Valuation Technique, Probability-Weighted, Expected Return
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value option, time to future exit	1 year 6 months	1 year 6 months
Level 3 | Valuation Technique, Probability-Weighted, Expected Return | Measurement Input, Probability Of IPO, Time To Future Exit Scenario
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value option, measurement input	1	1
Level 3 | Valuation Technique, Probability-Weighted, Expected Return | Measurement Input, Discount Rate
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value option, measurement input	0.176	0.176
Level 3 | Minimum | Valuation Technique, Discounted Cash Flow | LTM Revenue Multiple
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value option, measurement input	1.2	1.2
Level 3 | Maximum | Valuation Technique, Discounted Cash Flow | LTM Revenue Multiple
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value option, measurement input	1.4	1.4

Fair Value - Narrative (Details

Fair Value - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($)
Ampere
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible promissory note	$ 29

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Equity [Abstract]
Shares held in EBT (in shares)	0	1
Market value of shares held in EBT	$ 0.1	$ 75.4

Share-based Compensation - Narr

Share-based Compensation - Narrative (Details) - USD ($)	1 Months Ended				6 Months Ended
	Sep. 30, 2024	Aug. 31, 2024	Oct. 31, 2023	Aug. 31, 2023	Sep. 30, 2024
Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized share-based compensation	$ 1,065,500,000				$ 1,065,500,000
Unrecognized share-based compensation, recognition period					1 year 7 months 6 days
Shares authorized (in shares)	20,500,000				20,500,000
Annual increase in shares authorized				2%
Performance Shares, Continuous Service And Relative TSR
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					3 years
Performance Shares, Continuous Service And Relative TSR | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			3 years
Performance Shares, Continuous Service And Relative TSR | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting					0%
Performance Shares, Continuous Service And Relative TSR | Minimum | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting			0%
Performance Shares, Continuous Service And Relative TSR | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting					200%
Performance Shares, Continuous Service And Relative TSR | Maximum | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting			200%
Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Duration of each purchase period under the ESPP	24 months	6 months
Share based compensation arrangement maximum employee subscription rate	10%				10%
Maximum employee subscription amount					$ 25,000
Discount percent					15%
Executive Awards | 2022 RSU Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized share-based compensation	$ 480,600,000				$ 480,600,000
Restricted Stock Units (RSUs) | 2022 RSU Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized share-based compensation, recognition period					8 months 12 days
Restricted Stock Units, Continuous Service | Minimum | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock Units, Continuous Service | Maximum | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			4 years
Performance Shares | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			3 years
Performance Shares, Time Based | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			3 years
Performance Shares, Continuous Service And Performance Conditions | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Service period			1 year
Performance Shares, Continuous Service And Performance Conditions | Minimum | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting			0%
Performance Shares, Continuous Service And Performance Conditions | Maximum | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting			200%

Share-based Compensation - Sche

Share-based Compensation - Schedule of Restricted Stock Unit Activity (Details) - Executive Awards - 2022 RSU Plan - $ / shares shares in Millions	6 Months Ended
	Sep. 30, 2024	Mar. 31, 2024
Awards
Outstanding, beginning of period (in shares)	23
Granted (in shares)	1
Vested (in shares)	(10)
Cancelled and forfeited (in shares)	(2)
Outstanding, ending of period (in shares)	12
Weighted Average Grant Date Fair Value Per RSU
Outstanding (in dollars per share)	$ 44.23	$ 42.30
Granted (in dollars per share)	91.43
Vested (in dollars per share)	42.54
Cancelled and forfeited (in dollars per share)	$ 41.36

Share-based Compensation - Sc_2

Share-based Compensation - Schedule of Omnibus Incentive Plan (Details) - Restricted Stock Units And Performance Shares - Omnibus Incentive Plan - $ / shares shares in Millions	6 Months Ended
	Sep. 30, 2024	Mar. 31, 2024
Awards
Outstanding, beginning of period (in shares)	2
Granted (in shares)	10
Vested (in shares)	(1)
Cancelled and forfeited (in shares)	0
Outstanding, ending of period (in shares)	11
Weighted Average Grant Date Fair Value Per RSU
Outstanding (in dollars per share)	$ 113.20	$ 68.13
Granted (in dollars per share)	119.32
Vested (in dollars per share)	56.53
Cancelled and forfeited (in dollars per share)	$ 111.43

Share-based Compensation - Sc_3

Share-based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax share-based compensation cost	$ 218	$ 518	$ 400	$ 676
Less: income tax effect	30	41	42	70
Net share-based compensation cost	188	477	358	606
Cost of sales
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax share-based compensation cost	7	20	13	26
Research and development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax share-based compensation cost	154	349	283	452
Selling, general and administrative expenses
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax share-based compensation cost	$ 57	$ 149	$ 104	$ 198

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ (43)	$ (9)	$ (22)	$ 13
Income tax expense as a percentage of income before taxes	67.20%	(7.60%)	7.10%	(162.50%)
Release of contingency provision	$ 25

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income (loss)	$ 107	$ (110)	$ 330	$ (5)
Weighted average ordinary shares used to calculate basic net income (loss) per share (in shares)	1,049,000,000	1,025,000,000	1,047,000,000	1,025,000,000
Equity-classified shared-based awards (in shares)	14,000,000	0	14,000,000	0
Weighted average ordinary shares used to calculate diluted net income (loss) per share (in shares)	1,063,000,000	1,025,000,000	1,061,000,000	1,025,000,000
Income (loss) per share attributable to ordinary shareholders — basic
Net income (loss) per ordinary share - basic (in USD per share)	$ 0.10	$ (0.11)	$ 0.32	$ 0
Income (loss) per share attributable to ordinary shareholders — diluted
Net income (loss) per ordinary share - diluted (in USD per share)	$ 0.10	$ (0.11)	$ 0.31	$ 0

Net Income (Loss) Per Share -_2

Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,000,000	40,000,000	1,000,000	40,000,000
Restricted share units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	39,000,000	0	39,000,000
Performance share units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,000,000	1,000,000	1,000,000	1,000,000

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Loss contingency accrual reversal	$ 0	$ 40,000,000	$ 0	$ 40,000,000
Financial Standby Letter of Credit | Arduino
Debt Instrument [Line Items]
Guarantor obligation	$ 5,600,000		$ 5,600,000

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 31, 2023	Feb. 28, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024	Mar. 31, 2022
Related Party Transaction [Line Items]
Revenue			$ 844,000,000	$ 806,000,000	$ 1,783,000,000	$ 1,481,000,000
Operating expenses			748,000,000	916,000,000	1,472,000,000	1,449,000,000
Accounts receivable, net			1,006,000,000		1,006,000,000		$ 781,000,000
Other current liabilities			400,000,000		400,000,000		835,000,000
Contract liabilities			218,000,000		218,000,000		198,000,000
Allowance for current expected credit losses					16,000,000
Accounts receivable, allowance			19,000,000		19,000,000		3,000,000
Proceeds from equity method investments			1,000,000	2,100,000	1,300,000	2,400,000
Total prepaid expenses and other current assets			246,000,000		246,000,000		157,000,000
Other non-current assets			254,000,000		254,000,000		270,000,000
Loans receivable
Related Party Transaction [Line Items]
Loans and other receivables carried at amortized cost			27,000,000		27,000,000		26,000,000
IoTP
Related Party Transaction [Line Items]
Non-cash distribution, disposal of investment	$ 12,000,000
Cerfe Labs, Inc. | Loans receivable
Related Party Transaction [Line Items]
Loans and other receivables carried at amortized cost			3,200,000		3,200,000		3,100,000
Ampere | Loans receivable
Related Party Transaction [Line Items]
Other non-current assets			33,100,000		33,100,000		32,400,000
Related Parties
Related Party Transaction [Line Items]
Revenue			192,000,000	162,000,000	316,000,000	302,000,000
Operating lease, lease income, lease payments			300,000	400,000	700,000	900,000
Accounts receivable, net			164,000,000		164,000,000		182,000,000
Other current liabilities			12,000,000		12,000,000		7,000,000
Contract liabilities			107,000,000		107,000,000		107,000,000
Related Parties | Arduino | Loans receivable
Related Party Transaction [Line Items]
Other non-current assets			16,400,000		16,400,000		16,200,000
Service Share Arrangement | Related Parties
Related Party Transaction [Line Items]
Revenue			147,700,000	162,000,000	270,300,000	300,900,000
Operating expenses			15,200,000	17,500,000	31,400,000	33,600,000
Net receivable			168,900,000		168,900,000		175,800,000
Accounts receivable, net			179,500,000		179,500,000		181,100,000
Other current liabilities			10,600,000		10,600,000		5,300,000
Contract liabilities			106,900,000		106,900,000		105,700,000
Allowance for current expected credit losses			0	0	16,000,000	0
Accounts receivable, allowance			16,000,000		16,000,000		0
Common Control in SoftBank | Related Parties
Related Party Transaction [Line Items]
Revenue			43,200,000		43,200,000
Accounts receivable, net			0		0		800,000
Contract liabilities			0		0		1,600,000
Contract assets			43,200,000		43,200,000		3,100,000
Other Equity Investments | Related Parties
Related Party Transaction [Line Items]
Revenue			600,000	100,000	2,000,000	1,100,000
Accounts receivable, net			0		0		200,000
Contract liabilities			200,000		200,000		0
Contract assets			12,100,000		12,100,000		18,700,000
Linaro Agreement | Related Parties
Related Party Transaction [Line Items]
Other current liabilities			1,100,000		1,100,000		1,300,000
Subscription costs incurred			3,000,000	2,400,000	5,400,000	4,700,000
Amounts of transaction		$ 4,000,000
Related party transaction, term		5 years
Total prepaid expenses and other current assets			3,200,000		3,200,000		$ 3,200,000
Other Entities Controlled By SoftBank Group | Related Parties
Related Party Transaction [Line Items]
Revenue			0	$ 400,000	0	$ 600,000
Accounts receivable, net			0		0
Contract liabilities			0		0
Contract assets			$ 0		$ 0
Acetone Limited
Related Party Transaction [Line Items]
Ownership percentage								10%
Arm China | Acetone Limited
Related Party Transaction [Line Items]
Ownership percentage								48.20%