Microchip Technology (MCHP) 10-Q5 Nov 242025 Q2 Quarterly reportFinancial data

Company Profile

COVER PAGE 10-Q

COVER PAGE 10-Q - shares	6 Months Ended
COVER PAGE 10-Q - shares	Sep. 30, 2024	Oct. 28, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document period end date	Sep. 30, 2024
Document transition report	false
Entity File Number	0-21184
Entity Registrant Name	MICROCHIP TECHNOLOGY INCORPORATED
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-0629024
Entity Address, Address Line One	2355 W. Chandler Blvd.
Entity Address, City or Town	Chandler
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85224-6199
City Area Code	480
Local Phone Number	792-7200
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	MCHP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		537,010,234
Entity Central Index Key	0000827054
Current fiscal year end date	--03-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
ASSETS
Cash and cash equivalents	$ 286.1	$ 319.7
Accounts receivable, net	1,044.3	1,143.7
Inventories	1,339.6	1,316
Other current assets	235.5	233.6
Total current assets	2,905.5	3,013
Property, plant and equipment, net	1,171.2	1,194.6
Goodwill	6,681.9	6,675.4
Net Amount	2,654.5	2,781.8
Long-term deferred tax assets	1,637.5	1,596.5
Other assets	571.7	611.9
Total assets	15,622.3	15,873.2
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	204.2	213
Accrued liabilities	1,135.2	1,307
Current portion of long-term debt	1,946.3	999.4
Total current liabilities	3,285.7	2,519.4
Long-term debt	4,476.6	5,000.4
Long-term income tax payable	590.4	649.2
Long-term deferred tax liability	29.8	28.8
Other long-term liabilities	963.9	1,017.6
Stockholders' equity:
Preferred stock, $0.001 par value; authorized 5,000,000 shares; no shares issued or outstanding	0	0
Common stock, $0.001 par value; authorized 900,000,000 shares; 577,807,023 shares issued and 537,010,234 shares outstanding at September 30, 2024; 577,806,659 shares issued and 536,663,691 shares outstanding at March 31, 2024	0.5	0.5
Additional paid-in capital	2,445.6	2,482.9
Common stock held in treasury: 40,796,789 shares at September 30, 2024; 41,142,968 shares at March 31, 2024	(2,643.3)	(2,581.6)
Accumulated other comprehensive loss	(7.8)	(3.5)
Retained earnings	6,480.9	6,759.5
Total stockholders' equity	6,275.9	6,657.8
Total liabilities and stockholders' equity	$ 15,622.3	$ 15,873.2

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - $ / shares	Sep. 30, 2024	Mar. 31, 2024
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	900,000,000	900,000,000
Common stock, shares issued (shares)	577,807,023	577,806,659
Common stock, shares outstanding (in shares)	537,010,234	536,663,691
Common stock held in treasury (in shares)	40,796,789	41,142,968

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 1,163.8	$ 2,254.3	$ 2,405.1	$ 4,542.9
Cost of sales	495.3	726.9	999.7	1,457.1
Gross profit	668.5	1,527.4	1,405.4	3,085.8
Research and development	240.7	292.6	482.4	591.1
Selling, general and administrative	157	196.6	307.5	400.2
Amortization of acquired intangible assets	122.7	151.4	245.7	302.9
Special charges and other, net	1.5	1.8	4.1	3.5
Operating expenses	521.9	642.4	1,039.7	1,297.7
Operating income	146.6	885	365.7	1,788.1
Interest income	2	1.6	4.8	3.1
Interest expense	(59.1)	(46.8)	(120.9)	(94)
Loss on settlement of debt	0	(3.1)	0	(12.2)
Other income (loss), net	2	(3.1)	3.7	(3.1)
Income before income taxes	91.5	833.6	253.3	1,681.9
Income tax provision	13.1	167	45.6	348.9
Net income	$ 78.4	$ 666.6	$ 207.7	$ 1,333
Basic net income per common share (in dollars per share)	$ 0.15	$ 1.23	$ 0.39	$ 2.45
Diluted net income per common share (in dollars per share)	0.14	1.21	0.38	2.42
Dividends declared per common share (in dollars per share)	$ 0.454	$ 0.410	$ 0.906	$ 0.793
Basic common shares outstanding (in shares)	536.7	543.1	536.7	544.1
Diluted common shares outstanding (in shares)	542	549.2	542.4	550.3

CONDENSED CONSOLIDATED STATEM_2

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	$ 78.4	$ 666.6	$ 207.7	$ 1,333
Components of other comprehensive income (loss):
Actuarial gains (losses) related to defined benefit pension plans, net of tax effect	(4.1)	1.6	(4.3)	1.3
Other comprehensive income (loss), net of tax effect	(4.1)	1.6	(4.3)	1.3
Comprehensive income	$ 74.3	$ 668.2	$ 203.4	$ 1,334.3

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 207.7	$ 1,333
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	376.3	441.9
Deferred income taxes	(49.7)	27
Share-based compensation expense related to equity incentive plans	90.3	89.9
Loss on settlement of debt	0	12.2
Amortization of debt discount	28.1	4.8
Amortization of debt issuance costs	4.3	4
Impairment of intangible assets	0	1.1
Other	(24.3)	(0.1)
Changes in operating assets and liabilities, excluding impact of acquisitions:
Decrease (increase) in accounts receivable	99.4	(400.9)
Increase in inventories	(18.3)	(5.1)
(Decrease) increase in accounts payable and accrued liabilities	(182.3)	64
Change in other assets and liabilities	(50)	63.9
Change in income tax payable	(60.8)	(26.3)
Net cash provided by operating activities	420.7	1,609.4
Cash flows from investing activities:
Other investing	2.4	0.4
Proceeds from capital-related government incentives	0.1	0
Investments in other assets	(98.5)	(49.6)
Capital expenditures	(93.7)	(185.5)
Net cash used in investing activities	(189.7)	(234.7)
Cash flows from financing activities:
Proceeds from borrowings on Revolving Credit Facility	0	5,551
Proceeds from borrowings on Revolving Credit Facility	0	(5,612)
Proceeds from borrowings on 2025 Term Loan Facility	0	750
Proceeds from issuance of Commercial Paper	6,354.2	995
Repayments of Commercial Paper	(6,170.6)	0
Repayment of senior notes	(1,000)	(2,000)
Proceeds from issuance of convertible debt	1,250	0
Payments on settlement of convertible debt	0	(132.8)
Deferred financing costs	(16.5)	(1)
Purchase of capped call options	(105)	0
Proceeds from sale of common stock	33.6	40.6
Tax payments related to shares withheld for vested RSUs	(33.2)	(30.4)
Repurchase of common stock	(90)	(480.1)
Payment of cash dividends	(486.3)	(431.6)
Capital lease payments	(0.8)	(0.8)
Net cash used in financing activities	(264.6)	(1,352.1)
Net (decrease) increase in cash and cash equivalents	(33.6)	22.6
Cash and cash equivalents, and restricted cash at beginning of period	319.7	234
Cash and cash equivalents, and restricted cash at end of period	$ 286.1	$ 256.6

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common Stock and Additional Paid-in-Capital	Common Stock Held in Treasury	Accumulated Other Comprehensive Loss	Retained Earnings
Balance, common stock shares issued (in shares) at Mar. 31, 2023		577,800,000
Beginning balance at Mar. 31, 2023	$ 6,513.6	$ 2,413.8	$ (1,660.2)	$ (4.1)	$ 5,764.1
Beginning balance, common stock held in treasury (in shares) at Mar. 31, 2023			32,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	666.4				666.4
Other comprehensive loss	(0.3)			(0.3)
Proceeds from sales of common stock through employee equity incentive plans (shares)		900,000
Proceeds from sales of common stock through employee equity incentive plans	15.3	$ 15.3
RSU withholdings (shares)		(300,000)
RSU withholdings	(15.7)	$ (15.7)
Treasury stock used for new issuances (shares)		(600,000)	(600,000)
Treasury stock used for new issuances	0	$ (14.7)	$ 14.7
Repurchase of common stock (in shares)			1,800,000
Repurchase of common stock	(141.2)		$ (141.2)
Settlement of convertible debt	(43.3)	(43.3)
Share-based compensation	45.4	$ 45.4
Cash dividend	(208.9)				(208.9)
Balance, common stock shares issued (in shares) at Jun. 30, 2023		577,800,000
Ending balance at Jun. 30, 2023	6,831.3	$ 2,400.8	$ (1,786.7)	(4.4)	6,221.6
Ending balance, common stock held in treasury (in shares) at Jun. 30, 2023			33,500,000
Balance, common stock shares issued (in shares) at Mar. 31, 2023		577,800,000
Beginning balance at Mar. 31, 2023	6,513.6	$ 2,413.8	$ (1,660.2)	(4.1)	5,764.1
Beginning balance, common stock held in treasury (in shares) at Mar. 31, 2023			32,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,333
Other comprehensive loss	1.3
Balance, common stock shares issued (in shares) at Sep. 30, 2023		577,800,000
Ending balance at Sep. 30, 2023	6,968.5	$ 2,415.1	$ (2,109.3)	(2.8)	6,665.5
Ending balance, common stock held in treasury (in shares) at Sep. 30, 2023			36,800,000
Balance, common stock shares issued (in shares) at Jun. 30, 2023		577,800,000
Beginning balance at Jun. 30, 2023	6,831.3	$ 2,400.8	$ (1,786.7)	(4.4)	6,221.6
Beginning balance, common stock held in treasury (in shares) at Jun. 30, 2023			33,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	666.6				666.6
Other comprehensive loss	1.6			1.6
Proceeds from sales of common stock through employee equity incentive plans (shares)		1,100,000
Proceeds from sales of common stock through employee equity incentive plans	25.3	$ 25.3
RSU withholdings (shares)		(200,000)
RSU withholdings	(14.7)	$ (14.7)
Treasury stock used for new issuances (shares)		(900,000)	(900,000)
Treasury stock used for new issuances	0	$ (19.7)	$ 19.7
Repurchase of common stock (in shares)			4,200,000
Repurchase of common stock	(342.3)		$ (342.3)
Settlement of convertible debt	(22)	(22)
Share-based compensation	45.4	$ 45.4
Cash dividend	(222.7)				(222.7)
Balance, common stock shares issued (in shares) at Sep. 30, 2023		577,800,000
Ending balance at Sep. 30, 2023	$ 6,968.5	$ 2,415.1	$ (2,109.3)	(2.8)	6,665.5
Ending balance, common stock held in treasury (in shares) at Sep. 30, 2023			36,800,000
Balance, common stock shares issued (in shares) at Mar. 31, 2024	577,806,659	577,800,000
Beginning balance at Mar. 31, 2024	$ 6,657.8	$ 2,483.4	$ (2,581.6)	(3.5)	6,759.5
Beginning balance, common stock held in treasury (in shares) at Mar. 31, 2024	41,142,968		41,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 129.3				129.3
Other comprehensive loss	(0.2)			(0.2)
Proceeds from sales of common stock through employee equity incentive plans (shares)		800,000
Proceeds from sales of common stock through employee equity incentive plans	13.1	$ 13.1
RSU withholdings (shares)		(200,000)
RSU withholdings	(18.9)	$ (18.9)
Treasury stock used for new issuances (shares)		(600,000)	(600,000)
Treasury stock used for new issuances	0	$ (13)	$ 13
Repurchase of common stock (in shares)			800,000
Repurchase of common stock	(72.7)		$ (72.7)
Purchase of capped call options	(105)	(105)
Share-based compensation	45.2	$ 45.2
Cash dividend	(242.6)				(242.6)
Balance, common stock shares issued (in shares) at Jun. 30, 2024		577,800,000
Ending balance at Jun. 30, 2024	$ 6,406	$ 2,404.8	$ (2,641.3)	(3.7)	6,646.2
Ending balance, common stock held in treasury (in shares) at Jun. 30, 2024			41,300,000
Balance, common stock shares issued (in shares) at Mar. 31, 2024	577,806,659	577,800,000
Beginning balance at Mar. 31, 2024	$ 6,657.8	$ 2,483.4	$ (2,581.6)	(3.5)	6,759.5
Beginning balance, common stock held in treasury (in shares) at Mar. 31, 2024	41,142,968		41,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 207.7
Other comprehensive loss	$ (4.3)
Repurchase of common stock (in shares)	1,000,000
Repurchase of common stock	$ (90)
Balance, common stock shares issued (in shares) at Sep. 30, 2024	577,807,023	577,800,000
Ending balance at Sep. 30, 2024	$ 6,275.9	$ 2,446.1	$ (2,643.3)	(7.8)	6,480.9
Ending balance, common stock held in treasury (in shares) at Sep. 30, 2024	40,796,789		40,800,000
Balance, common stock shares issued (in shares) at Jun. 30, 2024		577,800,000
Beginning balance at Jun. 30, 2024	$ 6,406	$ 2,404.8	$ (2,641.3)	(3.7)	6,646.2
Beginning balance, common stock held in treasury (in shares) at Jun. 30, 2024			41,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78.4				78.4
Other comprehensive loss	(4.1)			(4.1)
Proceeds from sales of common stock through employee equity incentive plans (shares)		900,000
Proceeds from sales of common stock through employee equity incentive plans	20.5	$ 20.5
RSU withholdings (shares)		(200,000)
RSU withholdings	(14.3)	$ (14.3)
Treasury stock used for new issuances (shares)		(700,000)	(700,000)
Treasury stock used for new issuances	$ 0	$ (15.3)	$ 15.3
Repurchase of common stock (in shares)	200,000		200,000
Repurchase of common stock	$ (17.3)		$ (17.3)
Share-based compensation	50.4	$ 50.4
Cash dividend	$ (243.7)				(243.7)
Balance, common stock shares issued (in shares) at Sep. 30, 2024	577,807,023	577,800,000
Ending balance at Sep. 30, 2024	$ 6,275.9	$ 2,446.1	$ (2,643.3)	$ (7.8)	$ 6,480.9
Ending balance, common stock held in treasury (in shares) at Sep. 30, 2024	40,796,789		40,800,000

Basis of Presentation

Basis of Presentation	6 Months Ended
Basis of Presentation	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Microchip Technology Incorporated and its majority-owned and controlled subsidiaries (the Company). All significant intercompany accounts and transactions have been eliminated in consolidation. All dollar amounts in the financial statements and tables in these notes, except per share amounts, are stated in millions of U.S. dollars unless otherwise noted. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. GAAP, pursuant to the rules and regulations of the SEC. The information furnished herein reflects all adjustments which are, in the opinion of management, of a normal recurring nature and necessary for a fair statement of the results for the interim periods reported. Certain information and footnote disclosures normally included in audited consolidated financial statements have been condensed or omitted pursuant to such SEC rules and regulations. It is suggested that these condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2024. The results of operations for the three and six months ended September 30, 2024 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2025 or for any other period.

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements and Other Developments	6 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Recently Issued Accounting Pronouncements and Other Developments	Recently Issued Accounting Pronouncements and Other Developments Recently Issued Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU 2023-07- Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures , which requires public entities to disclose significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss, and an amount and description of the composition of other segment items to reconcile to segment profit or loss. The amendments in this update also expand the interim segment disclosure requirements. 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 with retrospective application required for all prior periods presented in the financial statements. The Company is currently evaluating the applicable disclosures. In December 2023, the FASB issued ASU 2023-09- Income Taxes (Topic 740): Improvements to Income Tax Disclosures , which modifies the rules on income tax disclosures to enhance the transparency and decision-usefulness of income tax disclosures, particularly in the rate reconciliation table and disclosures about income taxes paid. The amendments are intended to address investors’ requests for income tax disclosures that provide more information to help them better understand an entity’s exposure to potential changes in tax laws and the ensuing risks and opportunities and to assess income tax information that affects cash flow forecasts and capital allocation decisions. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. ASU 2023-09 is effective for public business entities for annual periods beginning after December 15, 2024 with early adoption permitted. All entities should apply the guidance prospectively but have the option to apply it retrospectively. The Company is continuing to assess the timing of adoption and the potential impacts of ASU 2023-09. SEC Climate Disclosures In March 2024, the SEC issued final rules requiring registrants to include comprehensive climate-related disclosures in annual reports and registration statements. As adopted, the final rules require large accelerated filers to make their first climate-related disclosures for fiscal years beginning in 2025. However, in April 2024, the SEC issued an order voluntarily staying the effectiveness of the new rules pending the completion of judicial review of certain legal challenges to their validity. The Company is currently evaluating these rules as adopted as well as monitoring the status of the related litigation and the SEC’s stay.

Segment Information

Segment Information	6 Months Ended
Segment Information	Sep. 30, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company's reportable segments are semiconductor products and technology licensing. The Company does not allocate operating expenses, interest income, interest expense, other income or expense, or provision for or benefit from income taxes to these segments for internal reporting purposes, as the Company does not believe that allocating these expenses is beneficial in evaluating segment performance. Additionally, the Company does not allocate assets to segments for internal reporting purposes as it does not manage its segments by such metrics. The following tables represent net sales and gross profit for each segment for the periods presented (in millions): Three Months Ended September 30, 2024 Six Months Ended September 30, 2024 Net Sales Gross Profit Net Sales Gross Profit Semiconductor products $ 1,125.0 $ 629.7 $ 2,344.1 $ 1,344.4 Technology licensing 38.8 38.8 61.0 61.0 Total $ 1,163.8 $ 668.5 $ 2,405.1 $ 1,405.4 Three Months Ended September 30, 2023 Six Months Ended September 30, 2023 Net Sales Gross Profit Net Sales Gross Profit Semiconductor products $ 2,227.7 $ 1,500.8 $ 4,482.5 $ 3,025.4 Technology licensing 26.6 26.6 60.4 60.4 Total $ 2,254.3 $ 1,527.4 $ 4,542.9 $ 3,085.8

Net Sales

Net Sales	6 Months Ended
Net Sales	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Net Sales	Net Sales The following table represents the Company's net sales by product line (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Mixed-signal Microcontrollers $ 594.6 $ 1,280.1 $ 1,239.3 $ 2,581.8 Analog 292.1 623.0 622.7 1,256.6 Other 277.1 351.2 543.1 704.5 Total net sales $ 1,163.8 $ 2,254.3 $ 2,405.1 $ 4,542.9 The product lines listed above are included entirely in the Company's semiconductor product segment with the exception of the other product line, which includes products from both the semiconductor product and technology licensing segments. The following table represents the Company's net sales by customer type (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Distributors $ 508.1 $ 1,126.1 $ 1,092.5 $ 2,234.0 Direct customers 616.9 1,101.6 1,251.6 2,248.5 Licensees 38.8 26.6 61.0 60.4 Total net sales $ 1,163.8 $ 2,254.3 $ 2,405.1 $ 4,542.9 Distributors are customers that buy products with the intention of reselling them. Distributors generally have a distributor agreement with the Company to govern the terms of the relationship. Direct customers are non-distributor customers, which generally do not have a master sales agreement with the Company. The Company's direct customers primarily consist of OEMs and, to a lesser extent, contract manufacturers. Licensees are customers of the Company's technology licensing segment, which include purchasers of intellectual property and customers that have licensing agreements to use the Company's SuperFlash ® embedded flash technology. All of the customer types listed in the table above are included in the Company's semiconductor product segment with the exception of licensees, which is included in the technology licensing segment. All of the Company's net sales are recognized from contracts with customers. The consideration received from customers is fixed, with the exception of consideration from certain distributors and customers under LTSAs. Certain of the Company's distributors are granted price concessions and return rights, which result in variable consideration. The amount of revenue recognized for sales to these certain distributors is adjusted for estimates of the price concessions and return rights that are expected to be claimed. These estimates are based on the recent history of price concessions and stock rotations, which are recorded as refund liabilities within accrued liabilities on the Company's condensed consolidated balance sheets. The Company collects amounts in advance for certain of its contracts with customers. These amounts are deferred until control of the product or service is transferred to the customer at which time it is recognized as revenue. As of September 30, 2024, the Company had approximately $870.8 million of deferred revenue, of which $240.8 million is included within accrued liabilities and the remaining $630.0 million is included within other long-term liabilities on the Company's condensed consolidated balance sheet. As of March 31, 2024, the Company had approximately $933.0 million of deferred revenue, of which $261.8 million is included within accrued liabilities and the remaining $671.2 million is included within other long-term liabilities on the Company's condensed consolidated balance sheets. Deferred revenue represents amounts that have been invoiced in advance which are expected to be recognized as revenue in future periods. Approximately $129.9 million of deferred revenue recorded on the Company's consolidated balance sheets as of March 31, 2024, was recognized as revenue during the six months ended September 30, 2024. Approximately $62.6 million of deferred revenue recorded on the Company's consolidated balance sheets as of March 31, 2023, was recognized as revenue during the six months ended September 30, 2023. Of the $870.8 million of deferred revenue as of September 30, 2024, $776.5 million is cash collected from customers under LTSAs, of which $168.3 million is included within accrued liabilities and $608.2 million is included within other long-term liabilities. Under these LTSAs, the Company receives an upfront deposit from the customer in exchange for assured supply over the contract period, which typically ranges from three

Net Income Per Common Share

Net Income Per Common Share	6 Months Ended
Net Income Per Common Share	Sep. 30, 2024
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share The following table sets forth the computation of basic and diluted net income per common share (in millions, except per share amounts): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Net income $ 78.4 $ 666.6 $ 207.7 $ 1,333.0 Basic weighted average common shares outstanding 536.7 543.1 536.7 544.1 Dilutive effect of RSUs 4.5 5.1 4.8 5.0 Dilutive effect of 2015 Senior Convertible Debt 0.2 0.2 0.2 0.3 Dilutive effect of 2017 Senior Convertible Debt 0.6 0.8 0.7 0.9 Diluted weighted average common shares outstanding 542.0 549.2 542.4 550.3 Basic net income per common share $ 0.15 $ 1.23 $ 0.39 $ 2.45 Diluted net income per common share $ 0.14 $ 1.21 $ 0.38 $ 2.42 The Company computed basic net income per common share based on the weighted average number of common shares outstanding during the period. The Company computed diluted net income per common share based on the weighted average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Potentially dilutive common shares from employee equity incentive plans are determined by applying the treasury stock method to the assumed vesting of outstanding RSUs. Prior to conversion of its Convertible Debt, the Company will include, in the diluted net income per common share calculation, the effect of the additional shares that may be issued when the Company's common stock price exceeds the conversion price using the if-converted method. The Company's Convertible Debt has no impact on diluted net income per common share unless the average price of the Company's common stock exceeds the conversion price because the Company is required to settle the principal amount of the Convertible Debt in cash upon conversion. The following is the weighted average conversion price per share used in calculating the dilutive effect (see Note 6 for details on the Convertible Debt): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 2015 Senior Convertible Debt $ 28.50 $ 29.10 $ 28.58 $ 29.18 2017 Senior Convertible Debt $ 44.44 $ 45.38 $ 44.57 $ 45.50 2020 Senior Convertible Debt $ 90.93 $ 92.05 $ 91.08 $ 92.19 2024 Senior Convertible Debt $ 121.84 $ — $ 121.84 $ — 2017 Junior Convertible Debt (1) $ — $ — $ — $ 44.81 (1) The weighted average conversion price per share for the 2017 Junior Convertible Debt was prior to the settlement of the outstanding principal amount in May 2023.

Debt

Debt	6 Months Ended
Debt	Sep. 30, 2024
Debt Disclosure [Abstract]
Debt	Debt Debt obligations included in the condensed consolidated balance sheets consisted of the following (in millions) (1) : Coupon Interest Rate Effective Interest Rate September 30, March 31, 2024 2024 2025 Term Loan Facility $ 750.0 $ 750.0 Commercial Paper 1,544.0 1,359.0 0.983% 2024 Notes 0.983% 1.1% — 1,000.0 4.250% 2025 Notes 4.250% 4.6% 1,200.0 1,200.0 5.050% 2029 Notes 5.050% 5.2% 1,000.0 1,000.0 Total Senior Indebtedness 4,494.0 5,309.0 Senior Subordinated Convertible Debt - Principal Outstanding 2015 Senior Convertible Debt 1.625% 1.8% 6.7 6.7 2017 Senior Convertible Debt 1.625% 1.8% 38.0 38.0 2020 Senior Convertible Debt 0.125% 0.5% 665.5 665.5 2024 Senior Convertible Debt 0.750% 1.0% 1,250.0 — Total Convertible Debt 1,960.2 710.2 Gross long-term debt including current maturities 6,454.2 6,019.2 Less: Debt discount (2) (12.7) (13.9) Less: Debt issuance costs (3) (18.6) (5.5) Net long-term debt including current maturities 6,422.9 5,999.8 Less: Current maturities (4) (1,946.3) (999.4) Net long-term debt $ 4,476.6 $ 5,000.4 (1) The Company had no outstanding borrowings under the Revolving Credit Facility at September 30, 2024 and at March 31, 2024. (2) The unamortized discount consists of the following (in millions): September 30, March 31, 2024 2024 Commercial Paper $ (5.0) $ (3.9) 0.983% 2024 Notes — (0.4) 4.250% 2025 Notes (2.9) (4.4) 5.050% 2029 Notes (4.8) (5.2) Total unamortized discount $ (12.7) $ (13.9) (3) Debt issuance costs consist of the following (in millions): September 30, March 31, 2024 2024 2025 Term Loan Facility $ (0.4) $ (0.7) 0.983% 2024 Notes — (0.2) 4.250% 2025 Notes (0.4) (0.6) 5.050% 2029 Notes (2.0) (2.2) 2017 Senior Convertible Debt (0.1) (0.1) 2020 Senior Convertible Debt (0.3) (1.7) 2024 Senior Convertible Debt (15.4) — Total debt issuance costs $ (18.6) $ (5.5) (4) As of September 30, 2024, current maturities consisted of the 2025 Term Loan Facility which matures on August 31, 2025 and the 4.250% 2025 Notes which matures on September 1, 2025. As of September 30, 2024, the outstanding Commercial Paper which matures within the three months ending December 31, 2024, and the 2020 Senior Convertible Debt which matures on November 15, 2024, and became convertible on August 15, 2024, were excluded from current maturities as the Company has the intent and ability to utilize proceeds from its Revolving Credit Facility to refinance such notes on a long-term basis. As of September 30, 2024, the 2015 Senior Convertible Debt which matures on February 15, 2025, and the 2017 Senior Convertible Debt which matures on February 15, 2027, were convertible and are excluded from current maturities as the Company has the intent and ability to utilize proceeds from its Revolving Credit Facility to settle the principal portion of its Convertible Debt upon conversion. As of March 31, 2024, current maturities consisted of the 0.983% 2024 Notes. As of March 31, 2024, the outstanding Commercial Paper which matured within the three months ended June 30, 2024 and the 2020 Senior Convertible Debt were excluded from current maturities as the Company had the intent and ability to utilize proceeds from its Revolving Credit Facility to refinance such notes on a long-term basis. As of March 31, 2024, the 2015 Senior Convertible Debt and the 2017 Senior Convertible Debt were convertible and were excluded from current maturities as the Company had the intent and ability to utilize proceeds from its Revolving Credit Facility to settle the principal portion of its Convertible Debt upon conversion. Expected maturities relating to the Company’s debt obligations based on the contractual maturity dates as of September 30, 2024, are as follows (in millions): Fiscal year ending March 31, Amount 2025 $ 2,216.2 2026 1,950.0 2027 38.0 2028 — 2029 1,000.0 Thereafter 1,250.0 Total $ 6,454.2 Ranking of Convertible Debt - Each series of Convertible Debt is an unsecured obligation which is subordinated in right of payment to the amounts outstanding under the Company's Senior Indebtedness. The Senior Subordinated Convertible Debt is subordinated to the Senior Indebtedness; ranks senior to the Company's indebtedness that is expressly subordinated in right of payment to it; ranks equal in right of payment to any of the Company's unsubordinated indebtedness that does not provide that it is senior to the Senior Subordinated Convertible Debt; ranks junior in right of payment to any of the Company's secured and unsecured unsubordinated indebtedness to the extent of the value of the assets securing such indebtedness; and is structurally subordinated to all indebtedness and other liabilities of the Company's subsidiaries. Summary of Conversion Features - On April 1, 2022, the Company irrevocably elected cash settlement for the principal amount of its Convertible Debt. Each series of Convertible Debt is convertible, subject to certain conditions, into cash, shares of the Company's common stock or a combination thereof, at the Company's election, at specified conversion rates (see table below), adjusted for certain events including the declaration of cash dividends. Except during the three-month period immediately preceding the maturity date of the applicable series of Convertible Debt, each series of Convertible Debt is convertible only upon the occurrence of (i) such time as the closing price of the Company's common stock exceeds the applicable conversion price (see table below) by 130% for 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter, (ii) during the 5 business day period after any 10 consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of notes of a given series for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the applicable conversion rate on each such trading day, or (iii) upon the occurrence of certain corporate events specified in the indenture of such series of Convertible Debt. In addition, for each series, with the exception of the 2020 Senior Convertible Debt and the 2024 Senior Convertible Debt, if at the time of conversion the applicable price of the Company's common stock exceeds the applicable conversion price at such time, the applicable conversion rate will be increased by up to an additional maximum incremental shares rate, as determined pursuant to a formula specified in the indenture for the applicable series of Convertible Debt, and as adjusted for cash dividends paid since the issuance of such series of Convertible Debt. However, in no event will the applicable conversion rate exceed the applicable maximum conversion rate specified in the indenture for the applicable series of Convertible Debt (see table below). The following table sets forth the applicable conversion rates adjusted for dividends declared since issuance of such series of Convertible Debt and the applicable incremental share factors and maximum conversion rates as adjusted for dividends paid since the applicable issuance date: Dividend adjusted rates as of September 30, 2024 Conversion Rate Approximate Conversion Price Incremental Share Factor Maximum Conversion Rate 2015 Senior Convertible Debt (1) 35.0888 $ 28.50 17.5462 49.1234 2017 Senior Convertible Debt (1) 22.5005 $ 44.44 11.2511 32.0632 2020 Senior Convertible Debt (1) 10.9974 $ 90.93 — 15.3964 2024 Senior Convertible Debt (1) 8.2078 $ 121.84 — 10.4649 (1) As of September 30, 2024, the 2024 Senior Convertible Debt was not convertible. The 2020 Senior Convertible Debt became convertible on August 15, 2024. As of September 30, 2024, the holders of each of the 2015 Senior Convertible Debt and 2017 Senior Convertible Debt have the right to convert their notes between October 1, 2024 and December 31, 2024 because the Company's common stock price has exceeded the applicable conversion price for such series by 130% for the specified period of time during the quarter ended September 30, 2024. With the exception of the 2020 Senior Convertible Debt, which became redeemable by the Company after November 20, 2022, and the 2024 Senior Convertible Debt, which may be redeemed by the Company on or after June 5, 2027, the Company may not redeem any series of Convertible Debt prior to the relevant maturity date and no sinking fund is provided for any series of Convertible Debt. Under the terms of the applicable indenture, the Company may repurchase any series of Convertible Debt in the open market or through privately negotiated exchange offers. Upon the occurrence of a fundamental change, as defined in the applicable indenture of such series of Convertible Debt, holders of such series may require the Company to purchase all or a portion of their Convertible Debt for cash at a price equal to 100% of the principal amount plus any accrued and unpaid interest. Interest expense consists of the following (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Debt issuance cost amortization $ 0.9 $ 1.1 $ 1.8 $ 2.6 Debt discount amortization 11.5 3.1 28.1 4.8 Interest expense 40.4 40.4 81.7 81.9 Total interest expense on Senior Indebtedness 52.8 44.6 111.6 89.3 Debt issuance cost amortization 1.4 0.7 2.5 1.4 Coupon interest expense 2.7 0.4 3.8 0.9 Total interest expense on Convertible Debt 4.1 1.1 6.3 2.3 Other interest expense 2.2 1.1 3.0 2.4 Total interest expense $ 59.1 $ 46.8 $ 120.9 $ 94.0 The Company's debt settlement transactions consist of the following (in millions): Principal Amount Settled Total Cash Consideration Net Loss on Inducements and Settlements September 2024 (1) 0.983% 2024 Notes $ 1,000.0 $ 1,000.0 $ — (1) The Company used proceeds from the issuance of Commercial Paper to finance such settlement. Convertible Debt In May 2024, the Company issued $1.25 billion aggregate principal amount of 2024 Senior Convertible Debt and incurred issuance costs of $16.5 million. Interest on the 2024 Senior Convertible Debt is payable semi-annually in arrears on June 1 and December 1. The 2024 Senior Convertible Debt will mature on June 1, 2030 unless redeemed, repurchased or converted. In connection with the issuance of the 2024 Senior Convertible Debt, the Company entered into capped call option transactions with several financial institutions at a cost of $105.0 million. The capped call options cover, subject to anti-dilution adjustments, the number of shares of the Company's common stock initially underlying the 2024 Senior Convertible Debt. Upon conversion of the 2024 Senior Convertible Debt, the Company may exercise the capped call options subject to a cap price of $167.23 per share, subject to certain adjustments under the terms of the capped call options, which are generally expected to reduce the potential dilution to the Company's common stock upon conversion of the 2024 Senior Convertible Debt and/or offset any cash payments the Company is required to make in excess of the principal amount of converted 2024 Senior Convertible Debt. Upon conversion of the 2024 Senior Convertible Debt, there will be no economic dilution from the 2024 Senior Convertible Debt until the average market price of the Company's common stock exceeds the cap price of $167.23 per share as the exercise of the capped call options will offset any dilution from the 2024 Senior Convertible Debt from the conversion price up to the cap price. As these transactions meet certain accounting criteria, the capped call options are recorded as a reduction of stockholders' equity and are not accounted for as derivatives. Commercial Paper In September 2023, the Company established a Commercial Paper program under which the Company may issue short-term unsecured promissory notes up to a maximum principal amount outstanding at any time of $2.75 billion with a maturity of up to 397 days from the date of issue. The Company's obligations with respect to the payment of the Commercial Paper are guaranteed by certain of its subsidiaries. The Commercial Paper will be sold at a discount from par or alternatively, will be sold at par and bear interest rates that will vary based on market conditions and the time of issuance. The Company's intention is to reduce the amounts that would otherwise be available to borrow under the Company's Revolving Credit Facility by the outstanding amount of Commercial Paper. As of September 30, 2024, the Company had $1.54 billion of principal amount of Commercial Paper outstanding. The weighted-average interest rate of the Company's outstanding Commercial Paper was 5.32% as of September 30, 2024.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the Company utilizes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1- Observable inputs such as quoted prices in active markets; Level 2- Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and Level 3- Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. The carrying amount of cash equivalents approximates fair value because their maturity is less than three months. The carrying amount of accounts receivable, accounts payable and accrued liabilities approximates fair value due to the short-term maturity of the amounts and are considered Level 2 in the fair value hierarchy. The fair value of the Company's 2025 Term Loan Facility, and the Commercial Paper, is estimated using discounted cash flow analysis, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements. Based on the borrowing rates currently available to the Company for bank loans with similar terms and average maturities, the fair value of the Company's 2025 Term Loan Facility, and the Commercial Paper at September 30, 2024 approximated the carrying value excluding debt discounts and debt issuance costs and are considered Level 2 in the fair value hierarchy. The Company measures the fair value of its Convertible Debt and Senior Notes for disclosure purposes. These fair values are based on observable market prices for this debt, which is traded in less active markets and are therefore classified as a Level 2 fair value measurement. The following table shows the carrying amounts and fair values of the Company's debt obligations (in millions): September 30, 2024 March 31, 2024 Carrying Amount (1) Fair Value Carrying Amount (1) Fair Value 2025 Term Loan Facility $ 749.6 $ 750.0 $ 749.3 $ 750.0 Commercial Paper 1,539.0 1,544.0 1,355.1 1,359.0 0.983% 2024 Notes — — 999.4 979.6 4.250% 2025 Notes 1,196.7 1,195.6 1,195.0 1,181.8 5.050% 2029 Notes 993.2 1,026.6 992.6 1,000.6 2015 Senior Convertible Debt 6.7 22.9 6.7 25.6 2017 Senior Convertible Debt 37.9 79.5 37.9 101.3 2020 Senior Convertible Debt 665.2 662.9 663.8 708.8 2024 Senior Convertible Debt 1,234.6 1,235.6 — — Total $ 6,422.9 $ 6,517.1 $ 5,999.8 $ 6,106.7 (1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 6 for further information).

Intangible Assets and Goodwill

Intangible Assets and Goodwill	6 Months Ended
Intangible Assets and Goodwill	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Intangible Assets and Goodwill Net amounts excluding fully amortized intangible assets, consist of the following (in millions): September 30, 2024 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,220.1 $ (4,819.0) $ 2,401.1 Customer-related 196.7 (146.8) 49.9 In-process research and development 56.8 — 56.8 Software licenses 252.2 (105.5) 146.7 Total $ 7,725.8 $ (5,071.3) $ 2,654.5 March 31, 2024 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,221.3 $ (4,590.9) $ 2,630.4 Customer-related 196.7 (140.8) 55.9 Software licenses 230.7 (135.2) 95.5 Total $ 7,648.7 $ (4,866.9) $ 2,781.8 During the six months ended September 30, 2024, due to acquisitions, the Company acquired $56.8 million of in-process research and development and $1.1 million of software licenses intangible assets. The amounts are considered immaterial for disclosure purposes. The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2025 through fiscal 2029, absent any future acquisitions or impairment charges (in millions): Fiscal Year Ending March 31, Amortization Expense 2025 $ 290.1 2026 $ 515.7 2027 $ 420.5 2028 $ 311.4 2029 $ 238.6 The Company amortizes intangible assets over their expected useful lives, which range between 1 and 15 years. Amortization expense attributed to intangible assets are assigned to cost of sales and operating expenses as follows (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Amortization expense charged to cost of sales $ 3.9 $ 3.0 $ 7.6 $ 6.0 Amortization expense charged to operating expense 142.5 169.0 284.5 338.4 Total amortization expense $ 146.4 $ 172.0 $ 292.1 $ 344.4 Goodwill activity by segment was as follows (in millions): Semiconductor Products Reporting Unit Technology Licensing Reporting Unit Balance at March 31, 2024 $ 6,656.2 $ 19.2 Immaterial additions due to acquisitions 6.5 — Balance at September 30, 2024 $ 6,662.7 $ 19.2 At March 31, 2024, the Company applied a qualitative goodwill impairment test to its two reporting units, and concluded that goodwill was not impaired. Through September 30, 2024, the Company has never recorded a goodwill impairment charge.

Other Financial Statement Detai

Other Financial Statement Details	6 Months Ended
Other Financial Statement Details	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Financial Statement Details	Other Financial Statement Details Accounts Receivable Accounts receivable consists of the following (in millions): September 30, March 31, 2024 2024 Trade accounts receivable $ 1,040.6 $ 1,141.7 Other 10.7 10.1 Total accounts receivable, gross 1,051.3 1,151.8 Less: allowance for expected credit losses 7.0 8.1 Total accounts receivable, net $ 1,044.3 $ 1,143.7 The Company sells certain of its trade accounts receivable on a non-recourse basis to a third-party financial institution pursuant to a factoring arrangement. The Company accounts for these transactions as sales of receivables and presents cash proceeds as cash provided by operating activities in the consolidated statements of cash flows. Total trade accounts receivable sold under the factoring arrangement were $64.9 million in the six months ended September 30, 2023. The Company terminated this program in the second quarter of fiscal 2025. Inventories The components of inventories consist of the following (in millions): September 30, March 31, 2024 2024 Raw materials $ 178.1 $ 184.0 Work in process 880.1 797.5 Finished goods 281.4 334.5 Total inventories $ 1,339.6 $ 1,316.0 Property, Plant and Equipment Property, plant and equipment consists of the following (in millions): September 30, March 31, 2024 2024 Land $ 89.3 $ 89.3 Building and building improvements 803.1 796.3 Machinery and equipment 2,742.4 2,778.1 Projects in process 418.4 349.6 Total property, plant and equipment, gross 4,053.2 4,013.3 Less: accumulated depreciation and amortization 2,882.0 2,818.7 Total property, plant and equipment, net $ 1,171.2 $ 1,194.6 Depreciation expense attributed to property, plant and equipment was $41.2 million and $84.2 million for the three and six months ended September 30, 2024, respectively, compared to $47.0 million and $97.5 million for the three and six months ended September 30, 2023, respectively. The Company reviews and evaluates its long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amount of such assets may not be recoverable. For each of the three and six months ended September 30, 2024 and 2023, the Company’s evaluation of its property, plant and equipment did not result in any material impairments. Accrued Liabilities Accrued liabilities consists of the following (in millions): September 30, March 31, 2024 2024 Accrued compensation and benefits $ 101.2 $ 117.8 Income taxes payable 86.0 90.8 Deferred revenue 240.8 261.8 Sales related reserves 431.2 580.6 Current portion of lease liabilities 34.7 32.6 Accrued expenses and other liabilities 241.3 223.4 Total accrued liabilities $ 1,135.2 $ 1,307.0

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Purchase Commitments The Company's purchase commitments primarily consist of agreements for the purchase of property, plant and equipment and other goods and services including wafer purchase obligations with the Company's wafer foundries, and manufacturing supply capacity reservation commitments. Total purchase commitments as of September 30, 2024, are as follows (in millions): Fiscal Year Ending March 31, Purchase Commitments 2025 $ 310.3 2026 219.4 2027 246.0 2028 203.5 2029 90.8 Thereafter 85.9 Total $ 1,155.9 Indemnification Contingencies The Company's technology license agreements generally include an indemnification clause that indemnifies the licensee against liability and damages (including legal defense costs) arising from any claims of patent, copyright, trademark or trade secret infringement by the Company's proprietary technology. The terms of these indemnification provisions approximate the terms of the outgoing technology license agreements, which are typically perpetual unless terminated by either party for breach. The possible amount of future payments the Company could be required to make based on agreements that specify indemnification limits, if such indemnifications were required on all of these agreements, is approximately $190.0 million. There are some licensing agreements in place that do not specify indemnification limits. As of September 30, 2024, the Company had not recorded any liabilities related to these indemnification obligations and the Company believes that any amounts that it may be required to pay under these agreements in the future will not have a material adverse effect on its financial position, cash flows or results of operations. Warranty Costs and Product Liabilities The Company accrues for known product-related claims if a loss is probable and can be reasonably estimated. During the periods presented, there have been no material accruals or payments regarding product warranty or product liability. Historically, the Company has experienced a low rate of payments on product claims. Although the Company cannot predict the likelihood or amount of any future claims, the Company does not believe these claims will have a material adverse effect on its financial condition, results of operations or liquidity. Legal Matters In the ordinary course of the Company's business, it is exposed to various legal actions as a result of contracts, product liability, customer claims, pricing or royalty disputes with customers and licensees, governmental investigations and other matters. The Company is involved in a limited number of these legal actions, both as plaintiff and defendant, with respect to the foregoing types of matters. Consequently, the Company could incur uninsured liability in any of these legal actions. The Company also periodically receives notifications from various third parties alleging infringement of patents or other intellectual property rights, or from customers requesting reimbursement for various costs. With respect to pending legal actions to which the Company is a party and other claims, although the outcomes are generally not determinable, the Company believes that the ultimate resolution of these matters (other than certain tax matters in the U.S. and Malaysia as described in Note 11 below) will not have a material adverse effect on its financial position, cash flows or results of operations. Litigation, governmental investigations and disputes relating to the semiconductor industry are not uncommon, and the Company is, from time to time, subject to such litigation, governmental investigations and disputes. As a result, no assurances can be given with respect to the extent or outcome of any such litigation, governmental investigations or disputes in the future. The Company accrues for claims and contingencies when losses become probable and reasonably estimable. As of the end of each applicable reporting period, the Company reviews each of its matters and, where it is probable that a liability has been or will be incurred, the Company accrues for all probable and reasonably estimable losses. Where the Company can reasonably estimate a range of losses it may incur regarding such a matter, the Company records an accrual for the amount within the range that constitutes its best estimate. If the Company can reasonably estimate a range but no amount within the range appears to be a better estimate than any other, the Company uses the amount that is the low end of such range. As of September 30, 2024, the Company's estimate of the aggregate potential liability for legal matters that is possible but not probable is approximately $25.0 million in excess of amounts accrued.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with ASC 740. The provision for income taxes is attributable to U.S. federal, state, and foreign income taxes. The Company’s effective tax rate for the interim period ended September 30, 2024 is 18.00% and is based on an estimated annual effective tax rate including the tax effect of items required to be recorded discretely in the interim periods in which those items occur. A comparison of the Company’s effective tax rates for the six months ended September 30, 2024 and September 30, 2023 is not meaningful due to the amount of pre-tax income, and income tax expense recorded during the prior period. The Company's effective tax rate is different than the statutory rates in the U.S. due to foreign income taxed at different rates than the U.S., changes in uncertain tax benefit positions, changes to valuation allowances, generation of tax credits, and the impact of Global Intangible Low Tax Income (GILTI) in the U.S. In addition, the Company has numerous tax holidays it receives related to its Thailand manufacturing operations based on its investment in property, plant and equipment in Thailand. The Company's tax holiday periods in Thailand expire at various times in the future, however, the Company actively seeks to obtain new tax holidays. The material components of foreign income taxed at a rate lower than the U.S. are earnings accrued in Thailand, Malta, and Ireland. The Company files U.S. federal, U.S. state, and foreign income tax returns. For U.S. federal, and in general for U.S. state tax returns, the fiscal 2007 and later tax years remain open for examination by tax authorities. For foreign tax returns, the Company is generally no longer subject to income tax examinations for years prior to fiscal 2007. In September 2021, the Company received a Statutory Notice of Deficiency (2007 to 2012 Notice) from the United States Internal Revenue Service (IRS) for fiscal 2007 through fiscal 2012. The disputed amounts largely relate to transfer pricing matters. In December 2021, the Company filed a petition in the U.S. Tax Court challenging the 2007 to 2012 Notice. In September 2023, the Company received a Revenue Agent Report (RAR) from the IRS for fiscal 2013 and fiscal 2016. In October 2023, the Company received a Statutory Notice of Deficiency (2014 to 2015 Notice) from the IRS for fiscal 2014 and fiscal 2015. The disputed amounts for fiscal 2013 to fiscal 2016 largely relate to transfer pricing matters. In December 2023, the Company filed a petition in the U.S. Tax Court challenging the 2014 to 2015 Notice. In May 2023, the Company received a proposed income adjustment from the Malaysian Inland Revenue Board (IRB) for fiscal 2020. In December 2023, the Company received a Notice of Assessment from the IRB asserting the same proposed income adjustment. If the adjustment is upheld by the highest court that has jurisdiction over this matter in Malaysia, it could result in income taxes and penalties up to $410.0 million. The disputed amounts largely relate to the characterization of certain assets. Depending on the outcome of the IRB audit, the Company may need to adjudicate this matter in Malaysia, and if the Company does, the Company may be required to pay the assessment and then, upon a series of favorable court rulings, request a refund of the amount. The timing of adjudicating this matter is uncertain but could commence in the next 12 months. The Company firmly believes that the assessments described above are without merit and plans to pursue all available administrative and judicial remedies necessary to resolve these matters. The Company intends to vigorously defend the positions and the Company is confident in its ability to prevail on the merits. The Company regularly assesses the likelihood of adverse outcomes resulting from examinations such as these to determine the adequacy of the Company's tax reserves. The ultimate outcome of disputes of this nature is uncertain, and if the IRS and IRB were to prevail on their assertions, the assessed tax, penalties, and deficiency interest could have a material adverse impact on the Company's financial position, results of operations or cash flows.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
Share-Based Compensation	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation The following table presents the details of the Company's share-based compensation expense (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Cost of sales (1) $ 4.3 $ 7.4 $ 10.9 $ 14.2 Research and development 26.9 23.7 50.2 46.6 Selling, general and administrative 15.1 14.3 29.2 29.1 Pre-tax effect of share-based compensation 46.3 45.4 90.3 89.9 Income tax benefit 9.7 9.6 18.9 19.0 Net income effect of share-based compensation $ 36.6 $ 35.8 $ 71.4 $ 70.9 (1) During the three and six months ended September 30, 2024, $5.0 million and $10.0 million, respectively, of share-based compensation expense was capitalized to inventory and $4.3 million and $10.9 million, respectively, of previously capitalized share-based compensation expense in inventory was sold. During the three and six months ended September 30, 2023, $4.7 million and $9.9 million, respectively, of share-based compensation expense was capitalized to inventory and $7.4 million and $14.2 million, respectively, of previously capitalized share-based compensation expense in inventory was sold.

Stock Repurchase Activity

Stock Repurchase Activity	6 Months Ended
Stock Repurchase Activity	Sep. 30, 2024
Equity [Abstract]
Stock Repurchase Activity	Stock Repurchase Activity In November 2021, the Company's Board of Directors approved a stock repurchase program to repurchase up to $4.00 billion of the Company's common stock in the open market or in privately negotiated transactions. There is no expiration date associated with the repurchase program. During the three and six months ended September 30, 2024, the Company purchased approximately 0.2 million shares and 1.0 million shares, respectively, of its common stock for a total cost of $17.3 million and $90.0 million, respectively, including the 1% excise tax on stock repurchases enacted by the Inflation Reduction Act of 2022 (Inflation Reduction Act). As of September 30, 2024, approximately $1.56 billion remained available for repurchases under the program. Shares repurchased are recorded as treasury shares and are used to fund share issuance requirements under the Company's equity incentive plans. As of September 30, 2024, the Company had approximately 40.8 million treasury shares.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
Accumulated Other Comprehensive Loss	Sep. 30, 2024
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following table presents the changes in the components of accumulated other comprehensive loss, net of tax (in millions): Minimum Pension Liability Foreign Currency Total Balance at March 31, 2024 $ 11.6 $ (15.1) $ (3.5) Net other comprehensive loss (4.3) — (4.3) Balance at September 30, 2024 $ 7.3 $ (15.1) $ (7.8)

Dividends

Dividends	6 Months Ended
Dividends	Sep. 30, 2024
Dividends [Abstract]
Dividends	Dividends A quarterly cash dividend of $0.454 per share was paid on September 5, 2024 in the aggregate amount of $243.7 million. A quarterly cash dividend of $0.455 per share was declared on November 5, 2024 and will be paid on December 6, 2024 to stockholders of record as of November 22, 2024. The Company expects the December 2024 payment of its quarterly cash dividend to be approximately $244.5 million.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended				6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net income	$ 78.4	$ 129.3	$ 666.6	$ 666.4	$ 207.7	$ 1,333

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Recently Issued Accounting Pr_2

Recently Issued Accounting Pronouncements and Other Developments (Policies)	6 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU 2023-07- Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures , which requires public entities to disclose significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss, and an amount and description of the composition of other segment items to reconcile to segment profit or loss. The amendments in this update also expand the interim segment disclosure requirements. 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 with retrospective application required for all prior periods presented in the financial statements. The Company is currently evaluating the applicable disclosures. In December 2023, the FASB issued ASU 2023-09- Income Taxes (Topic 740): Improvements to Income Tax Disclosures , which modifies the rules on income tax disclosures to enhance the transparency and decision-usefulness of income tax disclosures, particularly in the rate reconciliation table and disclosures about income taxes paid. The amendments are intended to address investors’ requests for income tax disclosures that provide more information to help them better understand an entity’s exposure to potential changes in tax laws and the ensuing risks and opportunities and to assess income tax information that affects cash flow forecasts and capital allocation decisions. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. ASU 2023-09 is effective for public business entities for annual periods beginning after December 15, 2024 with early adoption permitted. All entities should apply the guidance prospectively but have the option to apply it retrospectively. The Company is continuing to assess the timing of adoption and the potential impacts of ASU 2023-09. SEC Climate Disclosures In March 2024, the SEC issued final rules requiring registrants to include comprehensive climate-related disclosures in annual reports and registration statements. As adopted, the final rules require large accelerated filers to make their first climate-related disclosures for fiscal years beginning in 2025. However, in April 2024, the SEC issued an order voluntarily staying the effectiveness of the new rules pending the completion of judicial review of certain legal challenges to their validity. The Company is currently evaluating these rules as adopted as well as monitoring the status of the related litigation and the SEC’s stay.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
Segment Information (Tables)	Sep. 30, 2024
Segment Reporting [Abstract]
Schedule of Net Sales and Gross Profit for Each Segment	The following tables represent net sales and gross profit for each segment for the periods presented (in millions): Three Months Ended September 30, 2024 Six Months Ended September 30, 2024 Net Sales Gross Profit Net Sales Gross Profit Semiconductor products $ 1,125.0 $ 629.7 $ 2,344.1 $ 1,344.4 Technology licensing 38.8 38.8 61.0 61.0 Total $ 1,163.8 $ 668.5 $ 2,405.1 $ 1,405.4 Three Months Ended September 30, 2023 Six Months Ended September 30, 2023 Net Sales Gross Profit Net Sales Gross Profit Semiconductor products $ 2,227.7 $ 1,500.8 $ 4,482.5 $ 3,025.4 Technology licensing 26.6 26.6 60.4 60.4 Total $ 2,254.3 $ 1,527.4 $ 4,542.9 $ 3,085.8

Net Sales (Tables)

Net Sales (Tables)	6 Months Ended
Net Sales (Tables)	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table represents the Company's net sales by product line (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Mixed-signal Microcontrollers $ 594.6 $ 1,280.1 $ 1,239.3 $ 2,581.8 Analog 292.1 623.0 622.7 1,256.6 Other 277.1 351.2 543.1 704.5 Total net sales $ 1,163.8 $ 2,254.3 $ 2,405.1 $ 4,542.9 The following table represents the Company's net sales by customer type (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Distributors $ 508.1 $ 1,126.1 $ 1,092.5 $ 2,234.0 Direct customers 616.9 1,101.6 1,251.6 2,248.5 Licensees 38.8 26.6 61.0 60.4 Total net sales $ 1,163.8 $ 2,254.3 $ 2,405.1 $ 4,542.9

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	6 Months Ended
Net Income Per Common Share (Tables)	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted net income per common share (in millions, except per share amounts): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Net income $ 78.4 $ 666.6 $ 207.7 $ 1,333.0 Basic weighted average common shares outstanding 536.7 543.1 536.7 544.1 Dilutive effect of RSUs 4.5 5.1 4.8 5.0 Dilutive effect of 2015 Senior Convertible Debt 0.2 0.2 0.2 0.3 Dilutive effect of 2017 Senior Convertible Debt 0.6 0.8 0.7 0.9 Diluted weighted average common shares outstanding 542.0 549.2 542.4 550.3 Basic net income per common share $ 0.15 $ 1.23 $ 0.39 $ 2.45 Diluted net income per common share $ 0.14 $ 1.21 $ 0.38 $ 2.42
Schedule of Convertible Debt	The following is the weighted average conversion price per share used in calculating the dilutive effect (see Note 6 for details on the Convertible Debt): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 2015 Senior Convertible Debt $ 28.50 $ 29.10 $ 28.58 $ 29.18 2017 Senior Convertible Debt $ 44.44 $ 45.38 $ 44.57 $ 45.50 2020 Senior Convertible Debt $ 90.93 $ 92.05 $ 91.08 $ 92.19 2024 Senior Convertible Debt $ 121.84 $ — $ 121.84 $ — 2017 Junior Convertible Debt (1) $ — $ — $ — $ 44.81 (1) The weighted average conversion price per share for the 2017 Junior Convertible Debt was prior to the settlement of the outstanding principal amount in May 2023.

Debt (Tables)

Debt (Tables)	6 Months Ended
Debt (Tables)	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Debt Instruments	Debt obligations included in the condensed consolidated balance sheets consisted of the following (in millions) (1) : Coupon Interest Rate Effective Interest Rate September 30, March 31, 2024 2024 2025 Term Loan Facility $ 750.0 $ 750.0 Commercial Paper 1,544.0 1,359.0 0.983% 2024 Notes 0.983% 1.1% — 1,000.0 4.250% 2025 Notes 4.250% 4.6% 1,200.0 1,200.0 5.050% 2029 Notes 5.050% 5.2% 1,000.0 1,000.0 Total Senior Indebtedness 4,494.0 5,309.0 Senior Subordinated Convertible Debt - Principal Outstanding 2015 Senior Convertible Debt 1.625% 1.8% 6.7 6.7 2017 Senior Convertible Debt 1.625% 1.8% 38.0 38.0 2020 Senior Convertible Debt 0.125% 0.5% 665.5 665.5 2024 Senior Convertible Debt 0.750% 1.0% 1,250.0 — Total Convertible Debt 1,960.2 710.2 Gross long-term debt including current maturities 6,454.2 6,019.2 Less: Debt discount (2) (12.7) (13.9) Less: Debt issuance costs (3) (18.6) (5.5) Net long-term debt including current maturities 6,422.9 5,999.8 Less: Current maturities (4) (1,946.3) (999.4) Net long-term debt $ 4,476.6 $ 5,000.4 (1) The Company had no outstanding borrowings under the Revolving Credit Facility at September 30, 2024 and at March 31, 2024. (2) The unamortized discount consists of the following (in millions): September 30, March 31, 2024 2024 Commercial Paper $ (5.0) $ (3.9) 0.983% 2024 Notes — (0.4) 4.250% 2025 Notes (2.9) (4.4) 5.050% 2029 Notes (4.8) (5.2) Total unamortized discount $ (12.7) $ (13.9) (3) Debt issuance costs consist of the following (in millions): September 30, March 31, 2024 2024 2025 Term Loan Facility $ (0.4) $ (0.7) 0.983% 2024 Notes — (0.2) 4.250% 2025 Notes (0.4) (0.6) 5.050% 2029 Notes (2.0) (2.2) 2017 Senior Convertible Debt (0.1) (0.1) 2020 Senior Convertible Debt (0.3) (1.7) 2024 Senior Convertible Debt (15.4) — Total debt issuance costs $ (18.6) $ (5.5) (4) As of September 30, 2024, current maturities consisted of the 2025 Term Loan Facility which matures on August 31, 2025 and the 4.250% 2025 Notes which matures on September 1, 2025. As of September 30, 2024, the outstanding Commercial Paper which matures within the three months ending December 31, 2024, and the 2020 Senior Convertible Debt which matures on November 15, 2024, and became convertible on August 15, 2024, were excluded from current maturities as the Company has the intent and ability to utilize proceeds from its Revolving Credit Facility to refinance such notes on a long-term basis. As of September 30, 2024, the 2015 Senior Convertible Debt which matures on February 15, 2025, and the 2017 Senior Convertible Debt which matures on February 15, 2027, were convertible and are excluded from current maturities as the Company has the intent and ability to utilize proceeds from its Revolving Credit Facility to settle the principal portion of its Convertible Debt upon conversion. As of March 31, 2024, current maturities consisted of the 0.983% 2024 Notes. As of March 31, 2024, the outstanding Commercial Paper which matured within the three months ended June 30, 2024 and the 2020 Senior Convertible Debt were excluded from current maturities as the Company had the intent and ability to utilize proceeds from its Revolving Credit Facility to refinance such notes on a long-term basis. As of March 31, 2024, the 2015 Senior Convertible Debt and the 2017 Senior Convertible Debt were convertible and were excluded from current maturities as the Company had the intent and ability to utilize proceeds from its Revolving Credit Facility to settle the principal portion of its Convertible Debt upon conversion.
Schedule of Maturities of Long-term Debt	Expected maturities relating to the Company’s debt obligations based on the contractual maturity dates as of September 30, 2024, are as follows (in millions): Fiscal year ending March 31, Amount 2025 $ 2,216.2 2026 1,950.0 2027 38.0 2028 — 2029 1,000.0 Thereafter 1,250.0 Total $ 6,454.2
Schedule of Convertible Debt	The following table sets forth the applicable conversion rates adjusted for dividends declared since issuance of such series of Convertible Debt and the applicable incremental share factors and maximum conversion rates as adjusted for dividends paid since the applicable issuance date: Dividend adjusted rates as of September 30, 2024 Conversion Rate Approximate Conversion Price Incremental Share Factor Maximum Conversion Rate 2015 Senior Convertible Debt (1) 35.0888 $ 28.50 17.5462 49.1234 2017 Senior Convertible Debt (1) 22.5005 $ 44.44 11.2511 32.0632 2020 Senior Convertible Debt (1) 10.9974 $ 90.93 — 15.3964 2024 Senior Convertible Debt (1) 8.2078 $ 121.84 — 10.4649 (1)
Schedule of Interest Expense	Interest expense consists of the following (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Debt issuance cost amortization $ 0.9 $ 1.1 $ 1.8 $ 2.6 Debt discount amortization 11.5 3.1 28.1 4.8 Interest expense 40.4 40.4 81.7 81.9 Total interest expense on Senior Indebtedness 52.8 44.6 111.6 89.3 Debt issuance cost amortization 1.4 0.7 2.5 1.4 Coupon interest expense 2.7 0.4 3.8 0.9 Total interest expense on Convertible Debt 4.1 1.1 6.3 2.3 Other interest expense 2.2 1.1 3.0 2.4 Total interest expense $ 59.1 $ 46.8 $ 120.9 $ 94.0
Schedule of Debt Settlement	The Company's debt settlement transactions consist of the following (in millions): Principal Amount Settled Total Cash Consideration Net Loss on Inducements and Settlements September 2024 (1) 0.983% 2024 Notes $ 1,000.0 $ 1,000.0 $ — (1) The Company used proceeds from the issuance of Commercial Paper to finance such settlement.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
Fair Value of Financial Instruments (Tables)	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Summary of Carrying Amount and Fair Values	The following table shows the carrying amounts and fair values of the Company's debt obligations (in millions): September 30, 2024 March 31, 2024 Carrying Amount (1) Fair Value Carrying Amount (1) Fair Value 2025 Term Loan Facility $ 749.6 $ 750.0 $ 749.3 $ 750.0 Commercial Paper 1,539.0 1,544.0 1,355.1 1,359.0 0.983% 2024 Notes — — 999.4 979.6 4.250% 2025 Notes 1,196.7 1,195.6 1,195.0 1,181.8 5.050% 2029 Notes 993.2 1,026.6 992.6 1,000.6 2015 Senior Convertible Debt 6.7 22.9 6.7 25.6 2017 Senior Convertible Debt 37.9 79.5 37.9 101.3 2020 Senior Convertible Debt 665.2 662.9 663.8 708.8 2024 Senior Convertible Debt 1,234.6 1,235.6 — — Total $ 6,422.9 $ 6,517.1 $ 5,999.8 $ 6,106.7 (1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 6 for further information).

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	6 Months Ended
Intangible Assets and Goodwill (Tables)	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Net amounts excluding fully amortized intangible assets, consist of the following (in millions): September 30, 2024 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,220.1 $ (4,819.0) $ 2,401.1 Customer-related 196.7 (146.8) 49.9 In-process research and development 56.8 — 56.8 Software licenses 252.2 (105.5) 146.7 Total $ 7,725.8 $ (5,071.3) $ 2,654.5 March 31, 2024 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,221.3 $ (4,590.9) $ 2,630.4 Customer-related 196.7 (140.8) 55.9 Software licenses 230.7 (135.2) 95.5 Total $ 7,648.7 $ (4,866.9) $ 2,781.8
Schedule of Indefinite Lived Intangible Assets	Net amounts excluding fully amortized intangible assets, consist of the following (in millions): September 30, 2024 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,220.1 $ (4,819.0) $ 2,401.1 Customer-related 196.7 (146.8) 49.9 In-process research and development 56.8 — 56.8 Software licenses 252.2 (105.5) 146.7 Total $ 7,725.8 $ (5,071.3) $ 2,654.5 March 31, 2024 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,221.3 $ (4,590.9) $ 2,630.4 Customer-related 196.7 (140.8) 55.9 Software licenses 230.7 (135.2) 95.5 Total $ 7,648.7 $ (4,866.9) $ 2,781.8
Schedule of Projected Amortization Expense	The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2025 through fiscal 2029, absent any future acquisitions or impairment charges (in millions): Fiscal Year Ending March 31, Amortization Expense 2025 $ 290.1 2026 $ 515.7 2027 $ 420.5 2028 $ 311.4 2029 $ 238.6
Schedule of Amortization Expense by Intangible Asset Class	Amortization expense attributed to intangible assets are assigned to cost of sales and operating expenses as follows (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Amortization expense charged to cost of sales $ 3.9 $ 3.0 $ 7.6 $ 6.0 Amortization expense charged to operating expense 142.5 169.0 284.5 338.4 Total amortization expense $ 146.4 $ 172.0 $ 292.1 $ 344.4
Schedule of Goodwill Activity	Goodwill activity by segment was as follows (in millions): Semiconductor Products Reporting Unit Technology Licensing Reporting Unit Balance at March 31, 2024 $ 6,656.2 $ 19.2 Immaterial additions due to acquisitions 6.5 — Balance at September 30, 2024 $ 6,662.7 $ 19.2 At March 31, 2024, the Company applied a qualitative goodwill impairment test to its two reporting units, and concluded that goodwill was not impaired. Through September 30, 2024, the Company has never recorded a goodwill impairment charge.

Other Financial Statement Det_2

Other Financial Statement Details (Tables)	6 Months Ended
Other Financial Statement Details (Tables)	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Accounts Receivable	Accounts receivable consists of the following (in millions): September 30, March 31, 2024 2024 Trade accounts receivable $ 1,040.6 $ 1,141.7 Other 10.7 10.1 Total accounts receivable, gross 1,051.3 1,151.8 Less: allowance for expected credit losses 7.0 8.1 Total accounts receivable, net $ 1,044.3 $ 1,143.7
Summary of Inventory	The components of inventories consist of the following (in millions): September 30, March 31, 2024 2024 Raw materials $ 178.1 $ 184.0 Work in process 880.1 797.5 Finished goods 281.4 334.5 Total inventories $ 1,339.6 $ 1,316.0
Summary of Property, Plant and Equipment	Property, plant and equipment consists of the following (in millions): September 30, March 31, 2024 2024 Land $ 89.3 $ 89.3 Building and building improvements 803.1 796.3 Machinery and equipment 2,742.4 2,778.1 Projects in process 418.4 349.6 Total property, plant and equipment, gross 4,053.2 4,013.3 Less: accumulated depreciation and amortization 2,882.0 2,818.7 Total property, plant and equipment, net $ 1,171.2 $ 1,194.6
Summary of Accrued Liabilities	Accrued liabilities consists of the following (in millions): September 30, March 31, 2024 2024 Accrued compensation and benefits $ 101.2 $ 117.8 Income taxes payable 86.0 90.8 Deferred revenue 240.8 261.8 Sales related reserves 431.2 580.6 Current portion of lease liabilities 34.7 32.6 Accrued expenses and other liabilities 241.3 223.4 Total accrued liabilities $ 1,135.2 $ 1,307.0

Commitment and Contingencies (T

Commitment and Contingencies (Tables)	6 Months Ended
Commitment and Contingencies (Tables)	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Total Purchase Commitments	Total purchase commitments as of September 30, 2024, are as follows (in millions): Fiscal Year Ending March 31, Purchase Commitments 2025 $ 310.3 2026 219.4 2027 246.0 2028 203.5 2029 90.8 Thereafter 85.9 Total $ 1,155.9

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
Share-Based Compensation (Tables)	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Compensation Expense	The following table presents the details of the Company's share-based compensation expense (in millions): Three Months Ended September 30, Six Months Ended September 30, 2024 2023 2024 2023 Cost of sales (1) $ 4.3 $ 7.4 $ 10.9 $ 14.2 Research and development 26.9 23.7 50.2 46.6 Selling, general and administrative 15.1 14.3 29.2 29.1 Pre-tax effect of share-based compensation 46.3 45.4 90.3 89.9 Income tax benefit 9.7 9.6 18.9 19.0 Net income effect of share-based compensation $ 36.6 $ 35.8 $ 71.4 $ 70.9 (1) During the three and six months ended September 30, 2024, $5.0 million and $10.0 million, respectively, of share-based compensation expense was capitalized to inventory and $4.3 million and $10.9 million, respectively, of previously capitalized share-based compensation expense in inventory was sold. During the three and six months ended September 30, 2023, $4.7 million and $9.9 million, respectively, of share-based compensation expense was capitalized to inventory and $7.4 million and $14.2 million, respectively, of previously capitalized share-based compensation expense in inventory was sold.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Sep. 30, 2024
Equity [Abstract]
Schedule of Changes in Components of Accumulated Other Comprehensive Income	The following table presents the changes in the components of accumulated other comprehensive loss, net of tax (in millions): Minimum Pension Liability Foreign Currency Total Balance at March 31, 2024 $ 11.6 $ (15.1) $ (3.5) Net other comprehensive loss (4.3) — (4.3) Balance at September 30, 2024 $ 7.3 $ (15.1) $ (7.8)

Segment Information - Net Sales

Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment reporting information [Line Items]
Net Sales	$ 1,163.8	$ 2,254.3	$ 2,405.1	$ 4,542.9
Gross Profit	668.5	1,527.4	1,405.4	3,085.8
Semiconductor products
Segment reporting information [Line Items]
Net Sales	1,125	2,227.7	2,344.1	4,482.5
Gross Profit	629.7	1,500.8	1,344.4	3,025.4
Technology licensing
Segment reporting information [Line Items]
Net Sales	38.8	26.6	61	60.4
Gross Profit	$ 38.8	$ 26.6	$ 61	$ 60.4

Net Sales (Details)

Net Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Net Sales (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,163.8	$ 2,254.3	$ 2,405.1	$ 4,542.9
Semiconductor products
Disaggregation of Revenue [Line Items]
Total net sales	1,125	2,227.7	2,344.1	4,482.5
Deferred revenue	870.8		870.8		$ 933
Deferred revenue recognized			129.9	62.6
Semiconductor products \| Accrued liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, to be recognized within next 12 months	240.8		240.8		261.8
Semiconductor products \| Other noncurrent liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, non current	630		630		$ 671.2
Distributors
Disaggregation of Revenue [Line Items]
Total net sales	508.1	1,126.1	1,092.5	2,234
Direct customers
Disaggregation of Revenue [Line Items]
Total net sales	616.9	1,101.6	1,251.6	2,248.5
Licensees
Disaggregation of Revenue [Line Items]
Total net sales	38.8	26.6	61	60.4
Mixed-signal Microcontrollers
Disaggregation of Revenue [Line Items]
Total net sales	594.6	1,280.1	1,239.3	2,581.8
Analog
Disaggregation of Revenue [Line Items]
Total net sales	292.1	623	622.7	1,256.6
Other
Disaggregation of Revenue [Line Items]
Total net sales	277.1	$ 351.2	543.1	$ 704.5
Long Term Supply Arrangement \| Semiconductor products
Disaggregation of Revenue [Line Items]
Deferred revenue	776.5		776.5
Remaining performance obligation	$ 3,200		$ 3,200
Long Term Supply Arrangement \| Semiconductor products \| Minimum
Disaggregation of Revenue [Line Items]
Contract liability period			3 years
Long Term Supply Arrangement \| Semiconductor products \| Maximum
Disaggregation of Revenue [Line Items]
Contract liability period			5 years
Long Term Supply Arrangement \| Semiconductor products \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	24%		24%
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Long Term Supply Arrangement \| Semiconductor products \| Accrued liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, to be recognized within next 12 months	$ 168.3		$ 168.3
Long Term Supply Arrangement \| Semiconductor products \| Other noncurrent liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, non current	608.2		608.2
Other Arrangement \| Semiconductor products
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 94.3		$ 94.3

Net Income Per Common Share (De

Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 78.4	$ 129.3	$ 666.6	$ 666.4	$ 207.7	$ 1,333
Basic weighted average common shares outstanding (in shares)	536.7		543.1		536.7	544.1
Dilutive effect of stock options and RSUs (in shares)	4.5		5.1		4.8	5
Diluted weighted average common shares outstanding (in shares)	542		549.2		542.4	550.3
Basic net income per common share (in dollars per share)	$ 0.15		$ 1.23		$ 0.39	$ 2.45
Diluted net income per common share (in dollars per share)	$ 0.14		$ 1.21		$ 0.38	$ 2.42
2015 Senior Convertible Debt
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of Convertible Debt (in shares)	0.2		0.2		0.2	0.3
2015 Senior Convertible Debt \| Weighted Average
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)	$ 28.50		$ 29.10		$ 28.58	$ 29.18
2017 Senior Convertible Debt
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of Convertible Debt (in shares)	0.6		0.8		0.7	0.9
2017 Senior Convertible Debt \| Weighted Average
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)	$ 44.44		$ 45.38		$ 44.57	$ 45.50
2020 Senior Convertible Debt \| Weighted Average
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)	90.93		92.05		91.08	92.19
2024 Senior Convertible Debt \| Weighted Average
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)	121.84		0		121.84	0
2017 Junior Convertible Debt \| Weighted Average
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument, convertible, conversion price (in dollars per share)	$ 0		$ 0		$ 0	$ 44.81

Debt - Debt Obligations (Detail

Debt - Debt Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2024	May 31, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Long-term debt	$ 6,454.2		$ 6,019.2
Less: Debt discount	(12.7)		(13.9)
Less: Debt issuance costs	(18.6)		(5.5)
Net long-term debt including current maturities	6,422.9		5,999.8
Less: Current maturities	(1,946.3)		(999.4)
Net long-term debt	4,476.6		5,000.4
Senior Indebtedness
Debt Instrument [Line Items]
Long-term debt	$ 4,494		5,309
Senior Indebtedness \| 0.983% 2024 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	0.983%
Effective Interest Rate	1.10%
Long-term debt	$ 0		1,000
Less: Debt discount	0		(0.4)
Less: Debt issuance costs	$ 0		(0.2)
Senior Indebtedness \| 4.250% 2025 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	4.25%
Effective Interest Rate	4.60%
Long-term debt	$ 1,200		1,200
Less: Debt discount	(2.9)		(4.4)
Less: Debt issuance costs	$ (0.4)		(0.6)
Senior Indebtedness \| 5.050% 2029 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	5.05%
Effective Interest Rate	5.20%
Long-term debt	$ 1,000		1,000
Less: Debt discount	(4.8)		(5.2)
Less: Debt issuance costs	(2)		(2.2)
Commercial Paper
Debt Instrument [Line Items]
Long-term debt	1,544		1,359
Less: Debt discount	(5)		(3.9)
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	750		750
Less: Debt issuance costs	(0.4)		(0.7)
Convertible Debt
Debt Instrument [Line Items]
Long-term debt	$ 1,960.2		710.2
Senior Subordinated Convertible Debt \| 2015 Senior Convertible Debt
Debt Instrument [Line Items]
Coupon Interest Rate	1.625%
Effective Interest Rate	1.80%
Long-term debt	$ 6.7		6.7
Senior Subordinated Convertible Debt \| 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Coupon Interest Rate	1.625%
Effective Interest Rate	1.80%
Long-term debt	$ 38		38
Less: Debt issuance costs	$ (0.1)		(0.1)
Senior Subordinated Convertible Debt \| 2020 Senior Convertible Debt
Debt Instrument [Line Items]
Coupon Interest Rate	0.125%
Effective Interest Rate	0.50%
Long-term debt	$ 665.5		665.5
Less: Debt issuance costs	$ (0.3)		(1.7)
Senior Subordinated Convertible Debt \| 2024 Senior Convertible Debt
Debt Instrument [Line Items]
Coupon Interest Rate	0.75%
Effective Interest Rate	1%
Long-term debt	$ 1,250		0
Less: Debt issuance costs	$ (15.4)	$ (16.5)	$ 0

Debt - Unamortized Discount and

Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions	Sep. 30, 2024	May 31, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Total unamortized discount	$ (12.7)		$ (13.9)
Total debt issuance costs	(18.6)		(5.5)
Commercial Paper
Debt Instrument [Line Items]
Total unamortized discount	(5)		(3.9)
Senior Indebtedness \| 0.983% 2024 Notes
Debt Instrument [Line Items]
Total unamortized discount	0		(0.4)
Total debt issuance costs	0		(0.2)
Senior Indebtedness \| 4.250% 2025 Notes
Debt Instrument [Line Items]
Total unamortized discount	(2.9)		(4.4)
Total debt issuance costs	(0.4)		(0.6)
Senior Indebtedness \| 5.050% 2029 Notes
Debt Instrument [Line Items]
Total unamortized discount	(4.8)		(5.2)
Total debt issuance costs	(2)		(2.2)
Term Loan Facility
Debt Instrument [Line Items]
Total debt issuance costs	(0.4)		(0.7)
Senior Subordinated Convertible Debt \| 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Total debt issuance costs	(0.1)		(0.1)
Senior Subordinated Convertible Debt \| 2020 Senior Convertible Debt
Debt Instrument [Line Items]
Total debt issuance costs	(0.3)		(1.7)
Senior Subordinated Convertible Debt \| 2024 Senior Convertible Debt
Debt Instrument [Line Items]
Total debt issuance costs	$ (15.4)	$ (16.5)	$ 0

Debt - Maturities (Details)

Debt - Maturities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Fiscal year ending March 31,
2025	$ 2,216.2
2026	1,950
2027	38
2028	0
2029	1,000
Thereafter	1,250
Gross long-term debt including current maturities	$ 6,454.2	$ 6,019.2

Debt - Summary of Conversion Fe

Debt - Summary of Conversion Features- Narrative (Details)	6 Months Ended
Debt - Summary of Conversion Features- Narrative (Details)	Sep. 30, 2024 USD ($) day
Debt Instrument [Line Items]
Principal amount per note \| $	$ 1,000
2015 Senior Convertible Debt
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130%
2017 Senior Convertible Debt
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130%
Convertible Debt
Debt Instrument [Line Items]
Debt instrument, redemption price (percent)	100%
Convertible Debt \| Period one
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130%
Threshold trading days	20
Threshold consecutive trading days	30
Convertible Debt \| Period two
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	98%
Threshold trading days	5
Threshold consecutive trading days	10

Debt - Convertible Debt (Detail

Debt - Convertible Debt (Details)		6 Months Ended
Debt - Convertible Debt (Details)	May 31, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Principal amount of convertible debt issued		$ 1,000
Capped options indexed to equity, costs		105,000,000	$ 0
Debt issuance costs, net		$ 18,600,000		$ 5,500,000
2015 Senior Convertible Debt
Debt Instrument [Line Items]
Threshold percentage of stock price trigger		130%
2017 Senior Convertible Debt
Debt Instrument [Line Items]
Threshold percentage of stock price trigger		130%
Senior Convertible Debt \| 2015 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate		35.0888
Approximate Conversion Price (in dollars per share) \| $ / shares		$ 28.50
Incremental Share Factor		17.5462
Maximum Conversion Rate		49.1234
Senior Convertible Debt \| 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate		22.5005
Approximate Conversion Price (in dollars per share) \| $ / shares		$ 44.44
Incremental Share Factor		11.2511
Maximum Conversion Rate		32.0632
Debt issuance costs, net		$ 100,000		100,000
Senior Convertible Debt \| 2020 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate		10.9974
Approximate Conversion Price (in dollars per share) \| $ / shares		$ 90.93
Incremental Share Factor		0
Maximum Conversion Rate		15.3964
Debt issuance costs, net		$ 300,000		1,700,000
Senior Convertible Debt \| 2024 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate		8.2078
Approximate Conversion Price (in dollars per share) \| $ / shares		$ 121.84
Incremental Share Factor		0
Maximum Conversion Rate		10.4649
Principal amount of convertible debt issued	$ 1,250,000,000
Capped options indexed to equity, costs	$ 105,000,000
Option indexed to equity, strike price (in dollars per share) \| $ / shares	$ 167.23
Debt issuance costs, net	$ 16,500,000	$ 15,400,000		$ 0

Debt - Interest Expense (Detail

Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Debt - Interest Expense (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Debt issuance cost amortization			$ 4.3	$ 4
Debt discount amortization			28.1	4.8
Other interest expense	$ 2.2	$ 1.1	3	2.4
Total interest expense	59.1	46.8	120.9	94
Senior Indebtedness
Debt Instrument [Line Items]
Debt issuance cost amortization	0.9	1.1	1.8	2.6
Debt discount amortization	11.5	3.1	28.1	4.8
Interest expense	40.4	40.4	81.7	81.9
Total interest expense	52.8	44.6	111.6	89.3
Convertible Debt
Debt Instrument [Line Items]
Debt issuance cost amortization	1.4	0.7	2.5	1.4
Interest expense	2.7	0.4	3.8	0.9
Total interest expense	$ 4.1	$ 1.1	$ 6.3	$ 2.3

Debt - Schedule of Debt Settlem

Debt - Schedule of Debt Settlement Transaction (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Net Loss on Inducements and Settlements		$ 0	$ (3.1)	$ 0	$ (12.2)
0.983% 2024 Notes \| Senior Indebtedness
Debt Instrument [Line Items]
Principal Amount Settled	$ 1,000
Total Cash Consideration	1,000
Net Loss on Inducements and Settlements	$ 0

Debt - Commercial Paper Notes (

Debt - Commercial Paper Notes (Details) - USD ($)	Sep. 30, 2024	Mar. 31, 2024
Line of Credit Facility [Line Items]
Long-term debt	$ 6,454,200,000	$ 6,019,200,000
Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,750,000,000
Maturity from the date of issue	397 days
Long-term debt	$ 1,544,000,000	$ 1,359,000,000
Weighted average interest rate	5.32%

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	$ 6,422.9	$ 5,999.8
Carrying Amount \| Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	749.6	749.3
Carrying Amount \| Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,539	1,355.1
Carrying Amount \| 0.983% 2024 Notes \| Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	999.4
Carrying Amount \| 4.250% 2025 Notes \| Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,196.7	1,195
Carrying Amount \| 5.050% 2029 Notes \| Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	993.2	992.6
Carrying Amount \| 2015 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	6.7	6.7
Carrying Amount \| 2017 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	37.9	37.9
Carrying Amount \| 2020 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	665.2	663.8
Carrying Amount \| 2024 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,234.6	0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	6,517.1	6,106.7
Fair Value \| Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	750	750
Fair Value \| Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,544	1,359
Fair Value \| 0.983% 2024 Notes \| Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	979.6
Fair Value \| 4.250% 2025 Notes \| Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,195.6	1,181.8
Fair Value \| 5.050% 2029 Notes \| Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,026.6	1,000.6
Fair Value \| 2015 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	22.9	25.6
Fair Value \| 2017 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	79.5	101.3
Fair Value \| 2020 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	662.9	708.8
Fair Value \| 2024 Senior Convertible Debt \| Senior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	$ 1,235.6	$ 0

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2024	Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (5,071.3)	$ (4,866.9)
Gross Amount	7,725.8	7,648.7
Net Amount	2,654.5	2,781.8
Amortization Expense
2025	290.1
2026	515.7
2027	420.5
2028	311.4
2029	238.6
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, indefinite-lived	56.8
Amortization Expense
In-process research and development	$ 56.8
Minimum
Amortization Expense
Useful life	1 year
Maximum
Amortization Expense
Useful life	15 years
Core and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 7,220.1	7,221.3
Accumulated Amortization	(4,819)	(4,590.9)
Net Amount	2,401.1	2,630.4
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Amount	196.7	196.7
Accumulated Amortization	(146.8)	(140.8)
Net Amount	49.9	55.9
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross Amount	252.2	230.7
Accumulated Amortization	(105.5)	(135.2)
Net Amount	146.7	$ 95.5
Purchased intangible assets, finite-lived	$ 1.1

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Amortization of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 146.4	$ 172	$ 292.1	$ 344.4
Amortization expense charged to cost of sales
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	3.9	3	7.6	6
Amortization expense charged to operating expense
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 142.5	$ 169	$ 284.5	$ 338.4

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions	6 Months Ended
	Sep. 30, 2024 USD ($) reportingUnit
Goodwill [Roll Forward]
Beginning balance	$ 6,675.4
Ending balance	$ 6,681.9
Number of reporting units \| reportingUnit	2
Semiconductor Products Reporting Unit
Goodwill [Roll Forward]
Beginning balance	$ 6,656.2
Immaterial additions due to acquisitions	6.5
Ending balance	6,662.7
Technology Licensing Reporting Unit
Goodwill [Roll Forward]
Beginning balance	19.2
Immaterial additions due to acquisitions	0
Ending balance	$ 19.2

Other Financial Statement Det_3

Other Financial Statement Details - Accounts Receivable (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross		$ 1,051.3	$ 1,151.8
Less: allowance for expected credit losses		7	8.1
Total accounts receivable, net		1,044.3	1,143.7
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross		1,040.6	1,141.7
Trade accounts receivable sold	$ 64.9
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross		$ 10.7	$ 10.1

Other Financial Statement Det_4

Other Financial Statement Details - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 178.1	$ 184
Work in process	880.1	797.5
Finished goods	281.4	334.5
Total inventories	$ 1,339.6	$ 1,316

Other Financial Statement Det_5

Other Financial Statement Details - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 4,053.2		$ 4,053.2		$ 4,013.3
Less: accumulated depreciation and amortization	2,882		2,882		2,818.7
Total property, plant and equipment, net	1,171.2		1,171.2		1,194.6
Depreciation expense	41.2	$ 47	84.2	$ 97.5
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	89.3		89.3		89.3
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	803.1		803.1		796.3
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,742.4		2,742.4		2,778.1
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 418.4		$ 418.4		$ 349.6

Other Financial Statement Det_6

Other Financial Statement Details - Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and benefits	$ 101.2	$ 117.8
Income taxes payable	86	90.8
Deferred revenue	240.8	261.8
Sales related reserves	431.2	580.6
Current portion of lease liabilities	34.7	32.6
Accrued expenses and other liabilities	241.3	223.4
Total accrued liabilities	$ 1,135.2	$ 1,307

Commitment and Contingencies -

Commitment and Contingencies - Total Purchase Commitments (Details) $ in Millions	Sep. 30, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2025	$ 310.3
2026	219.4
2027	246
2028	203.5
2029	90.8
Thereafter	85.9
Total	$ 1,155.9

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($)
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued	$ 25
Indemnification Agreement
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 190

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions		6 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	May 25, 2023	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Effective tax rate		18%
Foreign Tax Authority \| Malaysian IRB
Operating Loss Carryforwards [Line Items]
Income tax, estimate of possible loss	$ 410

Share-Based Compensation - Shar

Share-Based Compensation - 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 effect of share-based compensation	$ 46.3	$ 45.4	$ 90.3	$ 89.9
Income tax benefit	9.7	9.6	18.9	19
Net income effect of share-based compensation	36.6	35.8	71.4	70.9
Inventory
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capitalized share-based compensation expense	5	4.7	10	9.9
Share-based compensation expense previously capitalized	4.3	7.4	10.9	14.2
Cost of sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	4.3	7.4	10.9	14.2
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	26.9	23.7	50.2	46.6
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 15.1	$ 14.3	$ 29.2	$ 29.1

Stock Repurchase Activity (Deta

Stock Repurchase Activity (Details) - USD ($)	3 Months Ended				6 Months Ended
Stock Repurchase Activity (Details) - USD ($)	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Mar. 31, 2024	Nov. 30, 2021
Equity [Abstract]
Stock repurchase program, authorized amount							$ 4,000,000,000
Repurchased shares under authorization (in shares)	200,000				1,000,000
Repurchased shares under authorization, value	$ 17,300,000	$ 72,700,000	$ 342,300,000	$ 141,200,000	$ 90,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 1,560,000,000				$ 1,560,000,000
Common stock held in treasury (in shares)	40,796,789				40,796,789	41,142,968

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Schedule of Changes in the Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Changes in the components of AOCI
Beginning balance	$ 6,406	$ 6,657.8	$ 6,831.3	$ 6,513.6	$ 6,657.8	$ 6,513.6
Net other comprehensive loss	(4.1)	(0.2)	1.6	(0.3)	(4.3)	1.3
Ending balance	6,275.9	6,406	6,968.5	6,831.3	6,275.9	6,968.5
Total
Changes in the components of AOCI
Beginning balance	(3.7)	(3.5)	(4.4)	(4.1)	(3.5)	(4.1)
Net other comprehensive loss	(4.1)	(0.2)	1.6	(0.3)
Ending balance	(7.8)	(3.7)	$ (2.8)	$ (4.4)	(7.8)	$ (2.8)
Minimum Pension Liability
Changes in the components of AOCI
Beginning balance		11.6			11.6
Net other comprehensive loss					(4.3)
Ending balance	7.3				7.3
Foreign Currency
Changes in the components of AOCI
Beginning balance		$ (15.1)			(15.1)
Net other comprehensive loss					0
Ending balance	$ (15.1)				$ (15.1)

Dividends (Details)

Dividends (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended				6 Months Ended
	Dec. 06, 2024	Nov. 05, 2024	Sep. 05, 2024	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Dividends Payable [Line Items]
Cash dividend paid (in dollars per share)			$ 0.454
Cash dividend			$ 243.7	$ 243.7	$ 242.6	$ 222.7	$ 208.9
Dividends declared per common share (in dollars per share)				$ 0.454		$ 0.410		$ 0.906	$ 0.793
Forecast
Dividends Payable [Line Items]
Cash dividend	$ 244.5
Subsequent event
Dividends Payable [Line Items]
Dividends declared per common share (in dollars per share)		$ 0.455