Microchip Technology (MCHP) 10-Q 2 Nov 23 2024 Q2 Quarterly report Financial data

COVER PAGE

COVER PAGE - shares	6 Months Ended
	Sep. 30, 2023	Oct. 26, 2023
Cover [Abstract]
Document Type	10-Q
Document period end date	Sep. 30, 2023
Document transition report	false
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		541,045,298
Entity Central Index Key	0000827054
Current fiscal year end date	--03-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity File Number	0-21184
Document Quarterly Report	true

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
ASSETS
Cash and cash equivalents	$ 256.6	$ 234
Accounts receivable, net	1,706.2	1,305.3
Inventories	1,330.9	1,324.9
Other current assets	232.7	205.1
Total current assets	3,526.4	3,069.3
Property, plant and equipment, net	1,206.9	1,177.9
Goodwill	6,675.4	6,673.6
Intangible assets, net	3,088.8	3,369
Long-term deferred tax assets	1,576	1,623.3
Other assets	527.9	457.2
Total assets	16,601.4	16,370.3
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	283.5	396.9
Accrued liabilities	1,468	1,323.5
Current portion of long-term debt	1,661.1	1,398.2
Total current liabilities	3,412.6	3,118.6
Long-term debt	4,414.7	5,041.7
Long-term income tax payable	678.5	705.7
Long-term deferred tax liability	34.1	42.7
Other long-term liabilities	1,093	948
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; 577,806,238 shares issued and 541,044,229 shares outstanding at September 30, 2023; 577,805,623 shares issued and 545,459,814 shares outstanding at March 31, 2023	0.5	0.5
Additional paid-in capital	2,414.6	2,413.3
Common stock held in treasury: 36,762,009 shares at September 30, 2023; 32,345,809 shares at March 31, 2023	(2,109.3)	(1,660.2)
Accumulated other comprehensive loss	(2.8)	(4.1)
Retained earnings	6,665.5	5,764.1
Total stockholders' equity	6,968.5	6,513.6
Total liabilities and stockholders' equity	$ 16,601.4	$ 16,370.3

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - $ / shares	Sep. 30, 2023	Mar. 31, 2023
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)	577,806,238	577,805,623
Common stock, shares outstanding (in shares)	541,044,229	545,459,814
Common stock held in treasury (in shares)	36,762,009	32,345,809

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales	$ 2,254.3	$ 2,073.2	$ 4,542.9	$ 4,036.8
Cost of sales	726.9	675.3	1,457.1	1,329
Gross profit	1,527.4	1,397.9	3,085.8	2,707.8
Research and development	292.6	268.6	591.1	537.6
Selling, general and administrative	196.6	202.4	400.2	391.3
Amortization of acquired intangible assets	151.4	167.5	302.9	335.1
Special charges (income) and other, net	1.8	4.3	3.5	(12.6)
Operating expenses	642.4	642.8	1,297.7	1,251.4
Operating income	885	755.1	1,788.1	1,456.4
Interest income	1.6	0.2	3.1	0.3
Interest expense	(46.8)	(53.3)	(94)	(103.6)
Loss on settlement of debt	(3.1)	(2.1)	(12.2)	(8.3)
Other (loss) income, net	(3.1)	(0.8)	(3.1)	0.9
Income before income taxes	833.6	699.1	1,681.9	1,345.7
Income tax provision	167	152.9	348.9	292.3
Net income	$ 666.6	$ 546.2	$ 1,333	$ 1,053.4
Basic net income per common share (in dollars per share)	$ 1.23	$ 0.99	$ 2.45	$ 1.91
Diluted net income per common share (in dollars per share)	1.21	0.98	2.42	1.88
Dividends declared per common share (in dollars per share)	$ 0.410	$ 0.301	$ 0.793	$ 0.577
Basic common shares outstanding (in shares)	543.1	551.5	544.1	552.7
Diluted common shares outstanding (in shares)	549.2	558.3	550.3	559.9

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 666.6	$ 546.2	$ 1,333	$ 1,053.4
Defined benefit plans:
Actuarial gains related to defined benefit pension plans, net of tax effect	1.6	5.1	1.3	9.1
Change in net foreign currency translation adjustment	0	(0.1)	0	(0.1)
Other comprehensive income, net of tax effect	1.6	5	1.3	9
Comprehensive income	$ 668.2	$ 551.2	$ 1,334.3	$ 1,062.4

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 1,333,000,000	$ 1,053,400,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	441,900,000	511,200,000
Deferred income taxes	27,000,000	131,300,000
Share-based compensation expense related to equity incentive plans	89,900,000	82,500,000
Loss on settlement of debt	12,200,000	8,300,000
Amortization of debt discount	4,800,000	3,600,000
Amortization of debt issuance costs	4,000,000	4,700,000
Impairment of intangible assets	1,100,000	0
Other non-cash adjustment	(100,000)	(2,300,000)
Changes in operating assets and liabilities, excluding impact of acquisitions:
Increase in accounts receivable	(400,900,000)	(60,600,000)
Increase in inventories	(5,100,000)	(190,200,000)
Increase in accounts payable and accrued liabilities	64,000,000	144,300,000
Change in other assets and liabilities	63,900,000	(10,600,000)
Change in income tax payable	(26,300,000)	(42,000,000)
Net cash provided by operating activities	1,609,400,000	1,633,600,000
Cash flows from investing activities:
Proceeds from sales of assets	400,000	400,000
Investments in other assets	(49,600,000)	(52,800,000)
Capital expenditures	(185,500,000)	(232,200,000)
Net cash used in investing activities	(234,700,000)	(284,600,000)
Cash flows from financing activities:
Proceeds from Issuance of Commercial Paper	995,000,000	0
Repayment of senior notes	(2,000,000,000)	0
Payments on settlement of convertible debt	(132,800,000)	(170,400,000)
Deferred financing costs	(1,000,000)	0
Proceeds from sale of common stock	40,600,000	37,800,000
Tax payments related to shares withheld for vested RSUs	(30,400,000)	(40,100,000)
Repurchase of common stock	(480,100,000)	(442,400,000)
Payment of cash dividends	(431,600,000)	(319,100,000)
Capital lease payments	(800,000)	(400,000)
Net cash used in financing activities	(1,352,100,000)	(1,361,600,000)
Net increase (decrease) in cash and cash equivalents	22,600,000	(12,600,000)
Cash and cash equivalents, and restricted cash at beginning of period	234,000,000	317,400,000
Cash and cash equivalents, and restricted cash at end of period	256,600,000	304,800,000
Revolving Credit Facility
Cash flows from financing activities:
Proceeds from lines of credit	5,551,000,000	2,765,000,000
Repayments of line of credit	(5,612,000,000)	(3,192,000,000)
Term Loan Facility
Cash flows from financing activities:
Proceeds from lines of credit	$ 750,000,000	$ 0

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Adjustment	Common Stock and Additional Paid-in-Capital	Common Stock and Additional Paid-in-Capital Adjustment	Common Stock Held in Treasury	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Adjustment
Balance, common stock shares issued (in shares) at Mar. 31, 2022			577,800,000
Beginning balance at Mar. 31, 2022	$ 5,894.8		$ 2,536.5		$ (796.3)	$ (20.6)	$ 4,175.2
Beginning balance (Accounting Standards Update 2020-06) at Mar. 31, 2022		$ (81.8)		$ (128.3)				$ 46.5
Beginning balance, common stock held in treasury (in shares) at Mar. 31, 2022					23,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	507.2						507.2
Other comprehensive income	4					4
Proceeds from sales of common stock through employee equity incentive plans (shares)			1,200,000
Proceeds from sales of common stock through employee equity incentive plans	13.4		$ 13.4
RSU withholdings (shares)			(300,000)
RSU withholdings	(19.4)		$ (19.4)
Treasury stock used for new issuances (shares)			(900,000)		(900,000)
Treasury stock used for new issuances	0		$ (16.5)		$ 16.5
Repurchase of common stock (in shares)					2,900,000
Repurchase of common stock	(195.2)				$ (195.2)
Settlement of convertible debt	(32.9)		(32.9)
Share-based compensation	40.8		$ 40.8
Cash dividend	(153)						(153)
Balance, common stock shares issued (in shares) at Jun. 30, 2022			577,800,000
Ending balance at Jun. 30, 2022	5,977.9		$ 2,393.6		$ (975)	(16.6)	4,575.9
Ending balance, common stock held in treasury (in shares) at Jun. 30, 2022					25,300,000
Balance, common stock shares issued (in shares) at Mar. 31, 2022			577,800,000
Beginning balance at Mar. 31, 2022	5,894.8		$ 2,536.5		$ (796.3)	(20.6)	4,175.2
Beginning balance (Accounting Standards Update 2020-06) at Mar. 31, 2022		$ (81.8)		$ (128.3)				$ 46.5
Beginning balance, common stock held in treasury (in shares) at Mar. 31, 2022					23,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,053.4
Other comprehensive income	9
Balance, common stock shares issued (in shares) at Sep. 30, 2022			577,800,000
Ending balance at Sep. 30, 2022	6,103.1		$ 2,356.1		$ (1,197.4)	(11.6)	4,956
Ending balance, common stock held in treasury (in shares) at Sep. 30, 2022					27,800,000
Balance, common stock shares issued (in shares) at Jun. 30, 2022			577,800,000
Beginning balance at Jun. 30, 2022	5,977.9		$ 2,393.6		$ (975)	(16.6)	4,575.9
Beginning balance, common stock held in treasury (in shares) at Jun. 30, 2022					25,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.2						546.2
Other comprehensive income	5					5
Proceeds from sales of common stock through employee equity incentive plans (shares)			1,400,000
Proceeds from sales of common stock through employee equity incentive plans	24.4		$ 24.4
RSU withholdings (shares)			(300,000)
RSU withholdings	(20.7)		$ (20.7)
Treasury stock used for new issuances (shares)			(1,100,000)		(1,100,000)
Treasury stock used for new issuances	0		$ (24.8)		$ 24.8
Repurchase of common stock (in shares)					3,600,000
Repurchase of common stock	(247.2)				$ (247.2)
Settlement of convertible debt	(58.2)		(58.2)
Share-based compensation	41.8		$ 41.8
Cash dividend	(166.1)						(166.1)
Balance, common stock shares issued (in shares) at Sep. 30, 2022			577,800,000
Ending balance at Sep. 30, 2022	$ 6,103.1		$ 2,356.1		$ (1,197.4)	(11.6)	4,956
Ending balance, common stock held in treasury (in shares) at Sep. 30, 2022					27,800,000
Balance, common stock shares issued (in shares) at Mar. 31, 2023	577,805,623		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	32,345,809				32,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 666.4						666.4
Other comprehensive income	(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	577,805,623		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	32,345,809				32,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,333
Other comprehensive income	$ 1.3					1.3
Repurchase of common stock (in shares)	6,000,000
Repurchase of common stock	$ (483.5)
Balance, common stock shares issued (in shares) at Sep. 30, 2023	577,806,238		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	36,762,009				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 income	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	577,806,238		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	36,762,009				36,800,000

Basis of Presentation

Basis of Presentation	6 Months Ended
	Sep. 30, 2023
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, 2023. The results of operations for the three and six months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2024 or for any other period.

Segment Information

Segment Information	6 Months Ended
	Sep. 30, 2023
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, 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 Three Months Ended September 30, 2022 Six Months Ended September 30, 2022 Net Sales Gross Profit Net Sales Gross Profit Semiconductor products $ 2,028.2 $ 1,352.9 $ 3,953.9 $ 2,624.9 Technology licensing 45.0 45.0 82.9 82.9 Total $ 2,073.2 $ 1,397.9 $ 4,036.8 $ 2,707.8

Net Sales

Net Sales	6 Months Ended
	Sep. 30, 2023
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, 2023 2022 2023 2022 Mixed-signal Microcontrollers $ 1,280.1 $ 1,179.5 $ 2,581.8 $ 2,242.5 Analog 623.0 572.5 1,256.6 1,152.5 Other 351.2 321.2 704.5 641.8 Total net sales $ 2,254.3 $ 2,073.2 $ 4,542.9 $ 4,036.8 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, 2023 2022 2023 2022 Distributors $ 1,126.1 $ 958.3 $ 2,234.0 $ 1,871.4 Direct customers 1,101.6 1,069.9 2,248.5 2,082.5 Licensees 26.6 45.0 60.4 82.9 Total net sales $ 2,254.3 $ 2,073.2 $ 4,542.9 $ 4,036.8 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. 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, 2023, the Company had approximately $899.0 million of deferred revenue, of which $175.7 million is included within accrued liabilities and the remaining $723.3 million is included within other long-term liabilities on the Company's condensed consolidated balance sheet. As of March 31, 2023, the Company had approximately $757.7 million of deferred revenue in the semiconductor product segment, of which $121.4 million is included within accrued liabilities and the remaining $636.3 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 $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. This amount was immaterial for the six months ended September 30, 2022. Of the $899.0 million of deferred revenue as of September 30, 2023, $857.7 million is cash collected from customers under LTSAs, of which $138.4 million is included within accrued liabilities and $719.3 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 to five years. If the customer does not meet the minimum purchase commitments defined in the contract, the Company may retain all, or portions of, the deposit as revenue. If the Company fails to assure supply as defined in the contract, the deposit, or portions of it, will be returned to the customer. The remaining performance obligations for the LTSAs were approximately $4.12 billion as of September 30, 2023, of which approximately 22% is expected to be recognized as net sales during the next 12 months. The amount and timing of such net sales is uncertain because it depends on the satisfaction of commitments made in the LTSAs, which may be affected by the timing and amount of orders placed by customers, contract modifications, variable consideration, sales channels, and manufacturing and supply chain conditions. Accordingly, the amount may not be indicative of net sales in future periods. The remaining $41.3 million of deferred revenue as of September 30, 2023 is related to other cash payments received from customers in advance of the Company’s performance obligations being satisfied. Most of the $41.3 million will be recognized as net sales within the next 12 months. In addition to LTSAs, a portion of the Company's non-LTSA customer contracts contain firmly committed orders beyond 12 months at the time of order. The transaction price for these orders with remaining performance obligations as of September 30, 2023, for orders with initial durations in excess of 12 months, approximates 20% of fiscal 2023 net sales, of which approximately 85% is expected to be recognized over the next 12 months. The amount and timing of such net sales is inherently uncertain because the ultimate transaction prices will be affected by variable consideration which is subject to change based upon market conditions at the time of the sale, contract modifications, and manufacturing and supply chain conditions. Accordingly, the amount may not be indicative of net sales in future periods.

Net Income Per Common Share

Net Income Per Common Share	6 Months Ended
	Sep. 30, 2023
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, 2023 2022 2023 2022 Net income $ 666.6 $ 546.2 $ 1,333.0 $ 1,053.4 Basic weighted average common shares outstanding 543.1 551.5 544.1 552.7 Dilutive effect of stock options and RSUs 5.1 5.1 5.0 5.2 Dilutive effect of 2015 Senior Convertible Debt 0.2 0.7 0.3 0.9 Dilutive effect of 2017 Senior Convertible Debt 0.8 0.9 0.9 1.0 Dilutive effect of 2017 Junior Convertible Debt — 0.1 — 0.1 Diluted weighted average common shares outstanding 549.2 558.3 550.3 559.9 Basic net income per common share $ 1.23 $ 0.99 $ 2.45 $ 1.91 Diluted net income per common share $ 1.21 $ 0.98 $ 2.42 $ 1.88 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 exercise of outstanding stock options and 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 5 for details on the Convertible Debt): Three Months Ended September 30, Six Months Ended September 30, 2023 2022 2023 2022 2015 Senior Convertible Debt $ 29.10 $ 29.65 $ 29.18 $ 29.71 2017 Senior Convertible Debt $ 45.38 $ 46.24 $ 45.50 $ 46.34 2020 Senior Convertible Debt $ 92.05 $ 92.92 $ 92.19 $ 93.00 2017 Junior Convertible Debt (1) $ — $ 45.42 $ 44.81 $ 45.52 (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
	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt	Debt Debt obligations included in the condensed consolidated balance sheets consisted of the following (in millions): Coupon Interest Rate Effective Interest Rate September 30, March 31, 2023 2023 Revolving Credit Facility $ 39.0 $ 100.0 2025 Term Loan Facility 750.0 — Commercial Paper 1,000.0 — 4.333% 2023 Notes 4.333% 4.7% — 1,000.0 2.670% 2023 Notes 2.670% 2.8% — 1,000.0 0.972% 2024 Notes 0.972% 1.1% 1,400.0 1,400.0 0.983% 2024 Notes 0.983% 1.1% 1,000.0 1,000.0 4.250% 2025 Notes 4.250% 4.6% 1,200.0 1,200.0 Total Senior Indebtedness 5,389.0 5,700.0 Senior Subordinated Convertible Debt - Principal Outstanding 2015 Senior Convertible Debt 1.625% 1.8% 6.7 12.4 2017 Senior Convertible Debt 1.625% 1.8% 38.0 82.2 2020 Senior Convertible Debt 0.125% 0.5% 665.5 665.5 Junior Subordinated Convertible Debt - Principal Outstanding 2017 Junior Convertible Debt 2.250% 2.3% — 6.5 Total Convertible Debt 710.2 766.6 Gross long-term debt including current maturities 6,099.2 6,466.6 Less: Debt discount (1) (10.6) (10.4) Less: Debt issuance costs (2) (12.8) (16.3) Net long-term debt including current maturities 6,075.8 6,439.9 Less: Current maturities (3) (1,661.1) (1,398.2) Net long-term debt $ 4,414.7 $ 5,041.7 (1) The unamortized discount consists of the following (in millions): September 30, March 31, 2023 2023 Commercial Paper $ (3.3) $ — 4.333% 2023 Notes — (0.2) 2.670% 2023 Notes — (0.4) 0.972% 2024 Notes (0.5) (1.2) 0.983% 2024 Notes (0.9) (1.3) 4.250% 2025 Notes (5.9) (7.3) Total unamortized discount $ (10.6) $ (10.4) (2) Debt issuance costs consist of the following (in millions): September 30, March 31, 2023 2023 Revolving Credit Facility $ (7.1) $ (8.6) 2025 Term Loan Facility (0.9) — 4.333% 2023 Notes — (0.4) 2.670% 2023 Notes — (0.2) 0.972% 2024 Notes (0.3) (0.6) 0.983% 2024 Notes (0.4) (0.8) 4.250% 2025 Notes (0.8) (0.9) 2017 Senior Convertible Debt (0.2) (0.4) 2020 Senior Convertible Debt (3.1) (4.4) Total debt issuance costs $ (12.8) $ (16.3) (3) As of September 30, 2023, current maturities consisted of the 2020 Senior Convertible Debt which will be convertible on August 15, 2024, and the 0.983% 2024 Notes which mature on September 1, 2024. As of September 30, 2023, the outstanding Commercial Paper, and the 0.972% 2024 Notes which mature on February 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, 2023, the 2015 Senior Convertible Debt and the 2017 Senior Convertible Debt 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, 2023, current maturities consisted of the 0.972% 2024 Notes which mature on February 15, 2024. As of March 31, 2023, the 2.670% 2023 Notes, which matured on September 1, 2023, and the 4.333% 2023 Notes, which matured on June 1, 2023 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, 2023, the 2015 Senior Convertible Debt, the 2017 Senior Convertible Debt and the 2017 Junior Convertible Debt 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 as of September 30, 2023, are as follows (in millions): Fiscal year ending March 31, Amount 2024 $ 2,400.0 2025 1,672.2 2026 1,950.0 2027 77.0 Total $ 6,099.2 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 - 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, 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). On April 1, 2022, the Company irrevocably elected cash settlement for the principal amount of its 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, 2023 Conversion Rate Approximate Conversion Price Incremental Share Factor Maximum Conversion Rate 2015 Senior Convertible Debt (1) 34.3667 $ 29.10 17.1851 48.1125 2017 Senior Convertible Debt (1) 22.0373 $ 45.38 11.0194 31.4033 2020 Senior Convertible Debt (1) 10.8633 $ 92.05 — 15.2086 (1) As of September 30, 2023, the 2020 Senior Convertible Debt was not convertible. As of September 30, 2023, 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, 2023 and December 31, 2023 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, 2023. As of September 30, 2023, the adjusted conversion rate for the 2015 Senior Convertible Debt and the 2017 Senior Convertible Debt would be increased to 45.1450 shares of common stock and 26.6501 shares of common stock, respectively, per $1,000 principal amount of notes based on the closing price of $78.05 per share of common stock to include an additional maximum incremental share rate per the terms of the applicable indenture. As of September 30, 2023, each of the 2015 Senior Convertible Debt and 2017 Senior Convertible Debt had a conversion value in excess of par of $17.0 million and $41.1 million, respectively. With the exception of the 2020 Senior Convertible Debt, which became redeemable by the Company after November 20, 2022, 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, 2023 2022 2023 2022 Debt issuance cost amortization $ 1.1 $ 1.7 $ 2.6 $ 3.4 Debt discount amortization 3.1 1.8 4.8 3.6 Interest expense 40.4 47.2 81.9 91.0 Total interest expense on Senior Indebtedness 44.6 50.7 89.3 98.0 Debt issuance cost amortization 0.7 0.7 1.4 1.3 Coupon interest expense 0.4 0.7 0.9 1.7 Total interest expense on Convertible Debt 1.1 1.4 2.3 3.0 Other interest expense 1.1 1.2 2.4 2.6 Total interest expense $ 46.8 $ 53.3 $ 94.0 $ 103.6 The Company's debt settlement transactions consists of the following (in millions): Principal Amount Settled Total Cash Consideration Net Loss on Inducements and Settlements September 2023 (1) 2.670% 2023 Notes $ 1,000.0 $ 1,000.0 $ — August 2023 (2) 2017 Senior Convertible Debt $ 18.2 $ 42.7 $ 3.1 June 2023 (3) 4.333% 2023 Notes $ 1,000.0 $ 1,000.0 $ — May 2023 (4) 2015 Senior Convertible Debt $ 5.6 $ 18.9 $ 0.4 2017 Senior Convertible Debt $ 25.9 $ 56.3 $ 6.6 2017 Junior Convertible Debt $ 6.5 $ 14.9 $ 2.1 (1) The Company used borrowings under its 2025 Term Loan Facility and its Revolving Credit Facility to finance the settlement. (2) The Company settled portions of its 2017 Senior Convertible Debt in privately negotiated transactions that are accounted for as induced conversions. (3) The Company used borrowings under its Revolving Credit Facility to finance a portion of such settlement. (4) The Company settled portions of its 2015 Senior Convertible Debt and 2017 Senior Convertible Debt, and the outstanding principal amount of its 2017 Junior Convertible Debt in privately negotiated transactions that are accounted for as induced conversions. Senior Credit Facilities In August 2023, the amended and restated Credit Agreement, dated as of December 16, 2021, was amended by the first incremental term loan amendment, dated as of August 31, 2023. Pursuant to this amendment, the Company borrowed an aggregate principal amount of $750.0 million under the new 2025 Term Loan Facility bearing interest at the Adjusted Term SOFR Rate, plus a margin of 1.125% to 1.5%, or Alternate Base Rate, plus a margin of 0.125% to 0.5%, with a maturity date of August 31, 2025. The interest rate margins are determined based on the Company's credit rating. 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. Outstanding Commercial Paper reduces the amounts that would otherwise be available to borrow under the Company's Revolving Credit Facility. As of September 30, 2023, the Company had $1.00 billion of principal amount of Commercial Paper outstanding. The weighted-average interest rate of the Company's outstanding Commercial Paper was 5.64% as of September 30, 2023.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Sep. 30, 2023
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. Management believes the carrying amount of the equity investments materially approximated fair value at September 30, 2023 based upon unobservable inputs. The fair values of these investments have been determined as Level 3 fair value measurements. 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 Revolving Credit Facility, the 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 Revolving Credit Facility, the 2025 Term Loan Facility, and the Commercial Paper at September 30, 2023 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, 2023 March 31, 2023 Carrying Amount (1) Fair Value Carrying Amount (1) Fair Value Revolving Credit Facility $ 31.9 $ 39.0 $ 91.4 $ 100.0 2025 Term Loan Facility 749.1 750.0 — — Commercial Paper 996.7 1,000.0 — — 4.333% 2023 Notes — — 999.4 997.1 2.670% 2023 Notes — — 999.4 985.4 0.972% 2024 Notes 1,399.2 1,374.1 1,398.2 1,337.6 0.983% 2024 Notes 998.7 955.1 997.9 941.9 4.250% 2025 Notes 1,193.3 1,162.9 1,191.8 1,176.0 2015 Senior Convertible Debt 6.7 23.6 12.4 41.8 2017 Senior Convertible Debt 37.8 84.1 81.8 189.6 2020 Senior Convertible Debt 662.4 693.9 661.1 732.1 2017 Junior Convertible Debt — — 6.5 14.5 Total $ 6,075.8 $ 6,082.7 $ 6,439.9 $ 6,516.0 (1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 5 for further information).

Intangible Assets and Goodwill

Intangible Assets and Goodwill	6 Months Ended
	Sep. 30, 2023
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, 2023 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,285.0 $ (4,371.9) $ 2,913.1 Customer-related 196.7 (132.8) 63.9 Software licenses 219.1 (107.3) 111.8 Total $ 7,700.8 $ (4,612.0) $ 3,088.8 March 31, 2023 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,296.2 $ (4,103.4) $ 3,192.8 Customer-related 199.8 (128.0) 71.8 In-process research and development 5.7 — 5.7 Software licenses 211.7 (113.0) 98.7 Distribution rights and other 0.3 (0.3) — Total $ 7,713.7 $ (4,344.7) $ 3,369.0 The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2024 through fiscal 2028, absent any future acquisitions or impairment charges (in millions): Fiscal Year Ending March 31, Amortization Expense 2024 $ 343.9 2025 $ 554.9 2026 $ 485.3 2027 $ 383.6 2028 $ 297.9 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, 2023 2022 2023 2022 Amortization expense charged to cost of sales $ 3.0 $ 3.9 $ 6.0 $ 7.2 Amortization expense charged to operating expense 169.0 184.3 338.4 368.7 Total amortization expense $ 172.0 $ 188.2 $ 344.4 $ 375.9 The Company recognized impairment charges of $0.6 million and $1.1 million in the three and six months ended September 30, 2023, respectively. There were no impairment charges in the three and six months ended September 30, 2022. Goodwill activity by segment was as follows (in millions): Semiconductor Products Reporting Unit Technology Licensing Reporting Unit Balance at March 31, 2023 $ 6,654.4 $ 19.2 Additions 1.8 — Balance at September 30, 2023 $ 6,656.2 $ 19.2 At March 31, 2023, the Company applied a qualitative goodwill impairment test to its two reporting units, and concluded that goodwill was not impaired. Through September 30, 2023, the Company has never recorded a goodwill impairment charge.

Other Financial Statement Detai

Other Financial Statement Details	6 Months Ended
	Sep. 30, 2023
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, 2023 2023 Trade accounts receivable $ 1,702.2 $ 1,300.4 Other 12.3 13.5 Total accounts receivable, gross 1,714.5 1,313.9 Less: allowance for expected credit losses 8.3 8.6 Total accounts receivable, net $ 1,706.2 $ 1,305.3 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. The Company did not sell its trade accounts receivable in the three months ended September 30, 2023. Total trade accounts receivable sold under the factoring arrangement in the six months ended September 30, 2023 were $64.9 million, compared to $186.2 million and $354.9 million for the three and six months ended September 30, 2022, respectively. Inventories The components of inventories consist of the following (in millions): September 30, March 31, 2023 2023 Raw materials $ 181.6 $ 192.6 Work in process 859.6 809.8 Finished goods 289.7 322.5 Total inventories $ 1,330.9 $ 1,324.9 Property, Plant and Equipment Property, plant and equipment consists of the following (in millions): September 30, March 31, 2023 2023 Land $ 89.3 $ 89.3 Building and building improvements 746.6 716.4 Machinery and equipment 2,743.9 2,669.1 Projects in process 372.6 354.3 Total property, plant and equipment, gross 3,952.4 3,829.1 Less: accumulated depreciation and amortization 2,745.5 2,651.2 Total property, plant and equipment, net $ 1,206.9 $ 1,177.9 Depreciation expense attributed to property, plant and equipment was $47.0 million and $97.5 million for the three and six months ended September 30, 2023, respectively, compared to $63.6 million and $135.3 million for the three and six months ended September 30, 2022, respectively. Depreciation expense in the three and six months ended September 30, 2023 included the impact of higher production levels, manufacturing expansion activities and moving and repurposing floor space and equipment. 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, 2023 and 2022, 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, 2023 2023 Accrued compensation and benefits $ 182.1 $ 193.5 Income taxes payable 107.9 106.2 Deferred revenue 175.7 121.4 Sales related reserves 727.2 536.1 Current portion of lease liabilities 32.3 31.5 Accrued expenses and other liabilities 242.8 334.8 Total accrued liabilities $ 1,468.0 $ 1,323.5

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Sep. 30, 2023
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, 2023, are as follows (in millions): Fiscal Year Ending March 31, Purchase Commitments 2024 $ 586.9 2025 219.7 2026 231.4 2027 196.9 2028 171.0 Thereafter 196.3 Total $ 1,602.2 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 $189.0 million. There are some licensing agreements in place that do not specify indemnification limits. As of September 30, 2023, 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 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, 2023, the Company's estimate of the aggregate potential liability for legal matters that is possible but not probable is approximately $150.0 million in excess of amounts accrued. As a result of its acquisition of Atmel, which closed April 4, 2016, the Company became involved with the following legal matter: Individual Labor Actions by former LFR Employees . In June 2010, Atmel Rousset sold its wafer manufacturing business in Rousset, France to LFoundry GmbH (LF), the German parent of LFoundry Rousset (LFR). LFR then leased the Atmel Rousset facility to conduct the manufacture of wafers. More than three years later, LFR became insolvent and later liquidated. In the wake of LFR's insolvency and liquidation, over 500 former employees of LFR filed individual labor actions against Atmel Rousset in a French labor court, and in 2019 a French labor court dismissed all of the employees’ claims against Atmel Rousset. In 2020, the Plaintiffs filed appeals with the Court of Appeals requesting reconsideration of the earlier dismissals. In December 2022, the Court of Appeals dismissed these appeals and held that there had been no co-employment of the plaintiffs by Atmel Rousset and LFoundry Rousset. However, in 2017 these same claims were filed by this same group of employees in a regional court in France against Microchip Technology Incorporated and Atmel Corporation. The Company , and the other defendant entities, believe that each of these actions is entirely devoid of merit, and, further, that any assertion by any of the Claimants of a co-employment relationship with any of these entities is based substantially on the same specious arguments that the Paris Commercial Court summarily rejected in 2014 in related proceedings. The defendant entities therefore intend to defend vigorously against each of these claims. Additionally, complaints have been filed in a regional court in France on behalf of the same group of employees against Microchip Technology Rousset, Atmel Switzerland Sarl, Atmel Corporation and Microchip Technology Incorporated alleging that the sale of the Atmel Rousset production unit to LF was fraudulent and should be voided. These claims are specious and the defendant entities therefore intend to defend vigorously against these claims.

Income Taxes

Income Taxes	6 Months Ended
	Sep. 30, 2023
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, 2023 is 20.68% 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, 2023 and September 30, 2022 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.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Sep. 30, 2023
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, 2023 2022 2023 2022 Cost of sales (1) $ 7.4 $ 6.5 $ 14.2 $ 14.2 Research and development 23.7 19.8 46.6 39.9 Selling, general and administrative 14.3 15.0 29.1 28.4 Pre-tax effect of share-based compensation 45.4 41.3 89.9 82.5 Income tax benefit 9.6 8.8 19.0 17.6 Net income effect of share-based compensation $ 35.8 $ 32.5 $ 70.9 $ 64.9 (1) 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. During the three and six months ended September 30, 2022, $4.7 million and $9.5 million, respectively, of share-based compensation expense was capitalized to inventory and $6.5 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
	Sep. 30, 2023
Equity [Abstract]
Stock Repurchase Activity	Stock Repurchase Activity

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Sep. 30, 2023
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, 2023 $ 11.0 $ (15.1) $ (4.1) Net other comprehensive income 1.3 — 1.3 Balance at September 30, 2023 $ 12.3 $ (15.1) $ (2.8)

Dividends

Dividends	6 Months Ended
	Sep. 30, 2023
Dividends [Abstract]
Dividends	Dividends A quarterly cash dividend of $0.410 per share was paid on September 5, 2023 in the aggregate amount of $222.7 million.  A quarterly cash dividend of $0.439 per share was declared on November 2, 2023 and will be paid on December 6, 2023 to stockholders of record as of November 22, 2023. The Company expects the December 2023 payment of its quarterly cash dividend to be approximately $238.0 million.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 666.6	$ 666.4	$ 546.2	$ 507.2	$ 1,333	$ 1,053.4

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
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

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Sep. 30, 2023
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, 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 Three Months Ended September 30, 2022 Six Months Ended September 30, 2022 Net Sales Gross Profit Net Sales Gross Profit Semiconductor products $ 2,028.2 $ 1,352.9 $ 3,953.9 $ 2,624.9 Technology licensing 45.0 45.0 82.9 82.9 Total $ 2,073.2 $ 1,397.9 $ 4,036.8 $ 2,707.8

Net Sales (Tables)

Net Sales (Tables)	6 Months Ended
	Sep. 30, 2023
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, 2023 2022 2023 2022 Mixed-signal Microcontrollers $ 1,280.1 $ 1,179.5 $ 2,581.8 $ 2,242.5 Analog 623.0 572.5 1,256.6 1,152.5 Other 351.2 321.2 704.5 641.8 Total net sales $ 2,254.3 $ 2,073.2 $ 4,542.9 $ 4,036.8 The following table represents the Company's net sales by customer type (in millions): Three Months Ended September 30, Six Months Ended September 30, 2023 2022 2023 2022 Distributors $ 1,126.1 $ 958.3 $ 2,234.0 $ 1,871.4 Direct customers 1,101.6 1,069.9 2,248.5 2,082.5 Licensees 26.6 45.0 60.4 82.9 Total net sales $ 2,254.3 $ 2,073.2 $ 4,542.9 $ 4,036.8

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	6 Months Ended
	Sep. 30, 2023
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, 2023 2022 2023 2022 Net income $ 666.6 $ 546.2 $ 1,333.0 $ 1,053.4 Basic weighted average common shares outstanding 543.1 551.5 544.1 552.7 Dilutive effect of stock options and RSUs 5.1 5.1 5.0 5.2 Dilutive effect of 2015 Senior Convertible Debt 0.2 0.7 0.3 0.9 Dilutive effect of 2017 Senior Convertible Debt 0.8 0.9 0.9 1.0 Dilutive effect of 2017 Junior Convertible Debt — 0.1 — 0.1 Diluted weighted average common shares outstanding 549.2 558.3 550.3 559.9 Basic net income per common share $ 1.23 $ 0.99 $ 2.45 $ 1.91 Diluted net income per common share $ 1.21 $ 0.98 $ 2.42 $ 1.88
Schedule of Convertible Debt	The following is the weighted average conversion price per share used in calculating the dilutive effect (see Note 5 for details on the Convertible Debt): Three Months Ended September 30, Six Months Ended September 30, 2023 2022 2023 2022 2015 Senior Convertible Debt $ 29.10 $ 29.65 $ 29.18 $ 29.71 2017 Senior Convertible Debt $ 45.38 $ 46.24 $ 45.50 $ 46.34 2020 Senior Convertible Debt $ 92.05 $ 92.92 $ 92.19 $ 93.00 2017 Junior Convertible Debt (1) $ — $ 45.42 $ 44.81 $ 45.52 (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
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Debt Instruments	Debt obligations included in the condensed consolidated balance sheets consisted of the following (in millions): Coupon Interest Rate Effective Interest Rate September 30, March 31, 2023 2023 Revolving Credit Facility $ 39.0 $ 100.0 2025 Term Loan Facility 750.0 — Commercial Paper 1,000.0 — 4.333% 2023 Notes 4.333% 4.7% — 1,000.0 2.670% 2023 Notes 2.670% 2.8% — 1,000.0 0.972% 2024 Notes 0.972% 1.1% 1,400.0 1,400.0 0.983% 2024 Notes 0.983% 1.1% 1,000.0 1,000.0 4.250% 2025 Notes 4.250% 4.6% 1,200.0 1,200.0 Total Senior Indebtedness 5,389.0 5,700.0 Senior Subordinated Convertible Debt - Principal Outstanding 2015 Senior Convertible Debt 1.625% 1.8% 6.7 12.4 2017 Senior Convertible Debt 1.625% 1.8% 38.0 82.2 2020 Senior Convertible Debt 0.125% 0.5% 665.5 665.5 Junior Subordinated Convertible Debt - Principal Outstanding 2017 Junior Convertible Debt 2.250% 2.3% — 6.5 Total Convertible Debt 710.2 766.6 Gross long-term debt including current maturities 6,099.2 6,466.6 Less: Debt discount (1) (10.6) (10.4) Less: Debt issuance costs (2) (12.8) (16.3) Net long-term debt including current maturities 6,075.8 6,439.9 Less: Current maturities (3) (1,661.1) (1,398.2) Net long-term debt $ 4,414.7 $ 5,041.7 (1) The unamortized discount consists of the following (in millions): September 30, March 31, 2023 2023 Commercial Paper $ (3.3) $ — 4.333% 2023 Notes — (0.2) 2.670% 2023 Notes — (0.4) 0.972% 2024 Notes (0.5) (1.2) 0.983% 2024 Notes (0.9) (1.3) 4.250% 2025 Notes (5.9) (7.3) Total unamortized discount $ (10.6) $ (10.4) (2) Debt issuance costs consist of the following (in millions): September 30, March 31, 2023 2023 Revolving Credit Facility $ (7.1) $ (8.6) 2025 Term Loan Facility (0.9) — 4.333% 2023 Notes — (0.4) 2.670% 2023 Notes — (0.2) 0.972% 2024 Notes (0.3) (0.6) 0.983% 2024 Notes (0.4) (0.8) 4.250% 2025 Notes (0.8) (0.9) 2017 Senior Convertible Debt (0.2) (0.4) 2020 Senior Convertible Debt (3.1) (4.4) Total debt issuance costs $ (12.8) $ (16.3) (3) As of September 30, 2023, current maturities consisted of the 2020 Senior Convertible Debt which will be convertible on August 15, 2024, and the 0.983% 2024 Notes which mature on September 1, 2024. As of September 30, 2023, the outstanding Commercial Paper, and the 0.972% 2024 Notes which mature on February 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, 2023, the 2015 Senior Convertible Debt and the 2017 Senior Convertible Debt 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, 2023, current maturities consisted of the 0.972% 2024 Notes which mature on February 15, 2024. As of March 31, 2023, the 2.670% 2023 Notes, which matured on September 1, 2023, and the 4.333% 2023 Notes, which matured on June 1, 2023 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, 2023, the 2015 Senior Convertible Debt, the 2017 Senior Convertible Debt and the 2017 Junior Convertible Debt 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 as of September 30, 2023, are as follows (in millions): Fiscal year ending March 31, Amount 2024 $ 2,400.0 2025 1,672.2 2026 1,950.0 2027 77.0 Total $ 6,099.2
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, 2023 Conversion Rate Approximate Conversion Price Incremental Share Factor Maximum Conversion Rate 2015 Senior Convertible Debt (1) 34.3667 $ 29.10 17.1851 48.1125 2017 Senior Convertible Debt (1) 22.0373 $ 45.38 11.0194 31.4033 2020 Senior Convertible Debt (1) 10.8633 $ 92.05 — 15.2086
Schedule of Interest Expense	Interest expense consists of the following (in millions): Three Months Ended September 30, Six Months Ended September 30, 2023 2022 2023 2022 Debt issuance cost amortization $ 1.1 $ 1.7 $ 2.6 $ 3.4 Debt discount amortization 3.1 1.8 4.8 3.6 Interest expense 40.4 47.2 81.9 91.0 Total interest expense on Senior Indebtedness 44.6 50.7 89.3 98.0 Debt issuance cost amortization 0.7 0.7 1.4 1.3 Coupon interest expense 0.4 0.7 0.9 1.7 Total interest expense on Convertible Debt 1.1 1.4 2.3 3.0 Other interest expense 1.1 1.2 2.4 2.6 Total interest expense $ 46.8 $ 53.3 $ 94.0 $ 103.6
Schedule of Settlement Transactions	The Company's debt settlement transactions consists of the following (in millions): Principal Amount Settled Total Cash Consideration Net Loss on Inducements and Settlements September 2023 (1) 2.670% 2023 Notes $ 1,000.0 $ 1,000.0 $ — August 2023 (2) 2017 Senior Convertible Debt $ 18.2 $ 42.7 $ 3.1 June 2023 (3) 4.333% 2023 Notes $ 1,000.0 $ 1,000.0 $ — May 2023 (4) 2015 Senior Convertible Debt $ 5.6 $ 18.9 $ 0.4 2017 Senior Convertible Debt $ 25.9 $ 56.3 $ 6.6 2017 Junior Convertible Debt $ 6.5 $ 14.9 $ 2.1 (1) The Company used borrowings under its 2025 Term Loan Facility and its Revolving Credit Facility to finance the settlement. (2) The Company settled portions of its 2017 Senior Convertible Debt in privately negotiated transactions that are accounted for as induced conversions. (3) The Company used borrowings under its Revolving Credit Facility to finance a portion of such settlement. (4) The Company settled portions of its 2015 Senior Convertible Debt and 2017 Senior Convertible Debt, and the outstanding principal amount of its 2017 Junior Convertible Debt in privately negotiated transactions that are accounted for as induced conversions.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Sep. 30, 2023
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, 2023 March 31, 2023 Carrying Amount (1) Fair Value Carrying Amount (1) Fair Value Revolving Credit Facility $ 31.9 $ 39.0 $ 91.4 $ 100.0 2025 Term Loan Facility 749.1 750.0 — — Commercial Paper 996.7 1,000.0 — — 4.333% 2023 Notes — — 999.4 997.1 2.670% 2023 Notes — — 999.4 985.4 0.972% 2024 Notes 1,399.2 1,374.1 1,398.2 1,337.6 0.983% 2024 Notes 998.7 955.1 997.9 941.9 4.250% 2025 Notes 1,193.3 1,162.9 1,191.8 1,176.0 2015 Senior Convertible Debt 6.7 23.6 12.4 41.8 2017 Senior Convertible Debt 37.8 84.1 81.8 189.6 2020 Senior Convertible Debt 662.4 693.9 661.1 732.1 2017 Junior Convertible Debt — — 6.5 14.5 Total $ 6,075.8 $ 6,082.7 $ 6,439.9 $ 6,516.0 (1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 5 for further information).

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	6 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Indefinite-Lived	Net amounts excluding fully amortized intangible assets, consist of the following (in millions): September 30, 2023 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,285.0 $ (4,371.9) $ 2,913.1 Customer-related 196.7 (132.8) 63.9 Software licenses 219.1 (107.3) 111.8 Total $ 7,700.8 $ (4,612.0) $ 3,088.8 March 31, 2023 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,296.2 $ (4,103.4) $ 3,192.8 Customer-related 199.8 (128.0) 71.8 In-process research and development 5.7 — 5.7 Software licenses 211.7 (113.0) 98.7 Distribution rights and other 0.3 (0.3) — Total $ 7,713.7 $ (4,344.7) $ 3,369.0
Schedule of Intangible Assets, Finite-Lived	Net amounts excluding fully amortized intangible assets, consist of the following (in millions): September 30, 2023 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,285.0 $ (4,371.9) $ 2,913.1 Customer-related 196.7 (132.8) 63.9 Software licenses 219.1 (107.3) 111.8 Total $ 7,700.8 $ (4,612.0) $ 3,088.8 March 31, 2023 Gross Amount Accumulated Amortization Net Amount Core and developed technology $ 7,296.2 $ (4,103.4) $ 3,192.8 Customer-related 199.8 (128.0) 71.8 In-process research and development 5.7 — 5.7 Software licenses 211.7 (113.0) 98.7 Distribution rights and other 0.3 (0.3) — Total $ 7,713.7 $ (4,344.7) $ 3,369.0
Schedule of Projected Amortization Expense	The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2024 through fiscal 2028, absent any future acquisitions or impairment charges (in millions): Fiscal Year Ending March 31, Amortization Expense 2024 $ 343.9 2025 $ 554.9 2026 $ 485.3 2027 $ 383.6 2028 $ 297.9
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, 2023 2022 2023 2022 Amortization expense charged to cost of sales $ 3.0 $ 3.9 $ 6.0 $ 7.2 Amortization expense charged to operating expense 169.0 184.3 338.4 368.7 Total amortization expense $ 172.0 $ 188.2 $ 344.4 $ 375.9
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, 2023 $ 6,654.4 $ 19.2 Additions 1.8 — Balance at September 30, 2023 $ 6,656.2 $ 19.2 At March 31, 2023, the Company applied a qualitative goodwill impairment test to its two reporting units, and concluded that goodwill was not impaired. Through September 30, 2023, the Company has never recorded a goodwill impairment charge.

Other Financial Statement Det_2

Other Financial Statement Details (Tables)	6 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Accounts Receivable	Accounts receivable consists of the following (in millions): September 30, March 31, 2023 2023 Trade accounts receivable $ 1,702.2 $ 1,300.4 Other 12.3 13.5 Total accounts receivable, gross 1,714.5 1,313.9 Less: allowance for expected credit losses 8.3 8.6 Total accounts receivable, net $ 1,706.2 $ 1,305.3
Summary of Inventory	The components of inventories consist of the following (in millions): September 30, March 31, 2023 2023 Raw materials $ 181.6 $ 192.6 Work in process 859.6 809.8 Finished goods 289.7 322.5 Total inventories $ 1,330.9 $ 1,324.9
Summary of Property, Plant and Equipment	Property, plant and equipment consists of the following (in millions): September 30, March 31, 2023 2023 Land $ 89.3 $ 89.3 Building and building improvements 746.6 716.4 Machinery and equipment 2,743.9 2,669.1 Projects in process 372.6 354.3 Total property, plant and equipment, gross 3,952.4 3,829.1 Less: accumulated depreciation and amortization 2,745.5 2,651.2 Total property, plant and equipment, net $ 1,206.9 $ 1,177.9
Summary of Accrued Liabilities	Accrued liabilities consists of the following (in millions): September 30, March 31, 2023 2023 Accrued compensation and benefits $ 182.1 $ 193.5 Income taxes payable 107.9 106.2 Deferred revenue 175.7 121.4 Sales related reserves 727.2 536.1 Current portion of lease liabilities 32.3 31.5 Accrued expenses and other liabilities 242.8 334.8 Total accrued liabilities $ 1,468.0 $ 1,323.5

Commitment and Contingencies (T

Commitment and Contingencies (Tables)	6 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Total Purchase Commitments	Total purchase commitments as of September 30, 2023, are as follows (in millions): Fiscal Year Ending March 31, Purchase Commitments 2024 $ 586.9 2025 219.7 2026 231.4 2027 196.9 2028 171.0 Thereafter 196.3 Total $ 1,602.2

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Sep. 30, 2023
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, 2023 2022 2023 2022 Cost of sales (1) $ 7.4 $ 6.5 $ 14.2 $ 14.2 Research and development 23.7 19.8 46.6 39.9 Selling, general and administrative 14.3 15.0 29.1 28.4 Pre-tax effect of share-based compensation 45.4 41.3 89.9 82.5 Income tax benefit 9.6 8.8 19.0 17.6 Net income effect of share-based compensation $ 35.8 $ 32.5 $ 70.9 $ 64.9 (1) 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. During the three and six months ended September 30, 2022, $4.7 million and $9.5 million, respectively, of share-based compensation expense was capitalized to inventory and $6.5 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
	Sep. 30, 2023
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, 2023 $ 11.0 $ (15.1) $ (4.1) Net other comprehensive income 1.3 — 1.3 Balance at September 30, 2023 $ 12.3 $ (15.1) $ (2.8)

Segment Information - Net Sales

Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment reporting information [Line Items]
Net Sales	$ 2,254.3	$ 2,073.2	$ 4,542.9	$ 4,036.8
Gross Profit	1,527.4	1,397.9	3,085.8	2,707.8
Semiconductor products
Segment reporting information [Line Items]
Net Sales	2,227.7	2,028.2	4,482.5	3,953.9
Gross Profit	1,500.8	1,352.9	3,025.4	2,624.9
Technology licensing
Segment reporting information [Line Items]
Net Sales	26.6	45	60.4	82.9
Gross Profit	$ 26.6	$ 45	$ 60.4	$ 82.9

Net Sales (Details)

Net Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total net sales	$ 2,254.3	$ 2,073.2	$ 4,542.9	$ 4,036.8
Semiconductor products
Disaggregation of Revenue [Line Items]
Total net sales	2,227.7	2,028.2	4,482.5	3,953.9
Deferred revenue	$ 899		899		$ 757.7
Deferred revenue recognized			$ 62.6
Semiconductor products | Contract with customer, initial duration, long term
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage of net sales	20%		20%
Semiconductor products | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Contract with customer, initial duration, long term
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	85%		85%
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Semiconductor products | Accrued liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, to be recognized within next 12 months	$ 175.7		$ 175.7		121.4
Semiconductor products | Other noncurrent liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, non current	723.3		723.3		$ 636.3
Distributors
Disaggregation of Revenue [Line Items]
Total net sales	1,126.1	958.3	2,234	1,871.4
Direct customers
Disaggregation of Revenue [Line Items]
Total net sales	1,101.6	1,069.9	2,248.5	2,082.5
Licensees
Disaggregation of Revenue [Line Items]
Total net sales	26.6	45	60.4	82.9
Mixed-signal Microcontrollers
Disaggregation of Revenue [Line Items]
Total net sales	1,280.1	1,179.5	2,581.8	2,242.5
Analog
Disaggregation of Revenue [Line Items]
Total net sales	623	572.5	1,256.6	1,152.5
Other
Disaggregation of Revenue [Line Items]
Total net sales	351.2	$ 321.2	704.5	$ 641.8
Long Term Supply Arrangement | Semiconductor products
Disaggregation of Revenue [Line Items]
Deferred revenue	857.7		857.7
Remaining performance obligation	$ 4,120		$ 4,120
Long Term Supply Arrangement | Semiconductor products | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	22%		22%
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	$ 138.4		$ 138.4
Long Term Supply Arrangement | Semiconductor products | Other noncurrent liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue, non current	719.3		719.3
Other Arrangement | Semiconductor products
Disaggregation of Revenue [Line Items]
Deferred revenue	41.3		41.3
Deferred revenue, to be recognized within next 12 months	$ 41.3		$ 41.3

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, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 666.6	$ 666.4	$ 546.2	$ 507.2	$ 1,333	$ 1,053.4
Basic weighted average common shares outstanding (in shares)	543.1		551.5		544.1	552.7
Dilutive effect of stock options and RSUs (in shares)	5.1		5.1		5	5.2
Diluted weighted average common shares outstanding (in shares)	549.2		558.3		550.3	559.9
Basic net income per common share (in dollars per share)	$ 1.23		$ 0.99		$ 2.45	$ 1.91
Diluted net income per common share (in dollars per share)	$ 1.21		$ 0.98		$ 2.42	$ 1.88
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		0.7		0.3	0.9
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)	$ 29.10		$ 29.65		$ 29.18	$ 29.71
2017 Senior Convertible Debt
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of Convertible Debt (in shares)	0.8		0.9		0.9	1
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)	$ 45.38		$ 46.24		$ 45.50	$ 46.34
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)	$ 92.05		$ 92.92		$ 92.19	$ 93
2017 Junior Convertible Debt
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of Convertible Debt (in shares)	0		0.1		0	0.1
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		$ 45.42		$ 44.81	$ 45.52

Debt - Debt Obligations (Detail

Debt - Debt Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Long-term debt	$ 6,099.2	$ 6,466.6
Less: Debt discount	(10.6)	(10.4)
Less: Debt issuance costs	(12.8)	(16.3)
Net long-term debt including current maturities	6,075.8	6,439.9
Less: Current maturities	(1,661.1)	(1,398.2)
Net long-term debt	4,414.7	5,041.7
Senior Indebtedness
Debt Instrument [Line Items]
Long-term debt	5,389	5,700
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	39	100
Less: Debt issuance costs	(7.1)	(8.6)
Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	750	0
Less: Debt issuance costs	$ (0.9)	0
Senior Indebtedness | 4.333% 2023 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	4.333%
Effective Interest Rate	4.70%
Long-term debt	$ 0	1,000
Less: Debt discount	0	(0.2)
Less: Debt issuance costs	$ 0	(0.4)
Senior Indebtedness | 2.670% 2023 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	2.67%
Effective Interest Rate	2.80%
Long-term debt	$ 0	1,000
Less: Debt discount	0	(0.4)
Less: Debt issuance costs	$ 0	(0.2)
Senior Indebtedness | 0.972% 2024 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	0.972%
Effective Interest Rate	1.10%
Long-term debt	$ 1,400	1,400
Less: Debt discount	(0.5)	(1.2)
Less: Debt issuance costs	$ (0.3)	(0.6)
Senior Indebtedness | 0.983% 2024 Notes
Debt Instrument [Line Items]
Coupon Interest Rate	0.983%
Effective Interest Rate	1.10%
Long-term debt	$ 1,000	1,000
Less: Debt discount	(0.9)	(1.3)
Less: Debt issuance costs	$ (0.4)	(0.8)
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	(5.9)	(7.3)
Less: Debt issuance costs	(0.8)	(0.9)
Convertible Debt
Debt Instrument [Line Items]
Long-term debt	$ 710.2	766.6
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	12.4
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	82.2
Less: Debt issuance costs	$ (0.2)	(0.4)
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	$ (3.1)	(4.4)
Junior Subordinated Convertible Debt | 2017 Junior Convertible Debt
Debt Instrument [Line Items]
Coupon Interest Rate	2.25%
Effective Interest Rate	2.30%
Long-term debt	$ 0	6.5
Commercial Paper
Debt Instrument [Line Items]
Long-term debt	1,000	0
Less: Debt discount	$ (3.3)	$ 0

Debt - Unamortized Discount and

Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Total unamortized discount	$ (10.6)	$ (10.4)
Total debt issuance costs	(12.8)	(16.3)
Senior Indebtedness | 4.333% 2023 Notes
Debt Instrument [Line Items]
Total unamortized discount	0	(0.2)
Total debt issuance costs	0	(0.4)
Senior Indebtedness | 2.670% 2023 Notes
Debt Instrument [Line Items]
Total unamortized discount	0	(0.4)
Total debt issuance costs	0	(0.2)
Senior Indebtedness | 0.972% 2024 Notes
Debt Instrument [Line Items]
Total unamortized discount	(0.5)	(1.2)
Total debt issuance costs	(0.3)	(0.6)
Senior Indebtedness | 0.983% 2024 Notes
Debt Instrument [Line Items]
Total unamortized discount	(0.9)	(1.3)
Total debt issuance costs	(0.4)	(0.8)
Senior Indebtedness | 4.250% 2025 Notes
Debt Instrument [Line Items]
Total unamortized discount	(5.9)	(7.3)
Total debt issuance costs	(0.8)	(0.9)
Senior Convertible Debt | 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Total debt issuance costs	(0.2)	(0.4)
Senior Convertible Debt | 2020 Senior Convertible Debt
Debt Instrument [Line Items]
Total debt issuance costs	(3.1)	(4.4)
Commercial Paper
Debt Instrument [Line Items]
Total unamortized discount	(3.3)	0
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Total debt issuance costs	(7.1)	(8.6)
Term Loan Facility | Line of Credit
Debt Instrument [Line Items]
Total debt issuance costs	$ (0.9)	$ 0

Debt - Maturities (Details)

Debt - Maturities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Fiscal year ending March 31,
2024	$ 2,400
2025	1,672.2
2026	1,950
2027	77
Gross long-term debt including current maturities	$ 6,099.2	$ 6,466.6

Debt - Summary of Conversion Fe

Debt - Summary of Conversion Features- Narrative (Details)	6 Months Ended
	Sep. 30, 2023 USD ($) day
Debt Instrument [Line Items]
If-converted value in excess of principal | $	$ 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 | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130%
Threshold trading days	20
Threshold consecutive trading days	30
Convertible Debt | Debt Instrument, Redemption, 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
	Sep. 30, 2023 USD ($) $ / shares
Debt Instrument [Line Items]
Value if converted above par | $	$ 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%
Senior Convertible Debt | 2015 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate	34.3667
Approximate Conversion Price (in dollars per share)	$ 29.10
Incremental Share Factor	17.1851
Maximum Conversion Rate	48.1125
Conversion rate, adjusted based on closing stock price	45.1450
Value if converted above par | $	$ 17,000,000
Senior Convertible Debt | 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate	22.0373
Approximate Conversion Price (in dollars per share)	$ 45.38
Incremental Share Factor	11.0194
Maximum Conversion Rate	31.4033
Conversion rate, adjusted based on closing stock price	26.6501
Value if converted above par | $	$ 41,100,000
Senior Convertible Debt | 2020 Senior Convertible Debt
Debt Instrument [Line Items]
Conversion Rate	10.8633
Approximate Conversion Price (in dollars per share)	$ 92.05
Incremental Share Factor	0
Maximum Conversion Rate	15.2086
Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share)	$ 78.05

Debt - Interest Expense (Detail

Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Debt issuance cost amortization			$ 4	$ 4.7
Debt discount amortization			4.8	3.6
Other interest expense	$ 1.1	$ 1.2	2.4	2.6
Total interest expense	46.8	53.3	94	103.6
Senior Indebtedness
Debt Instrument [Line Items]
Debt issuance cost amortization	1.1	1.7	2.6	3.4
Debt discount amortization	3.1	1.8	4.8	3.6
Interest expense	40.4	47.2	81.9	91
Total interest expense	44.6	50.7	89.3	98
Convertible Debt
Debt Instrument [Line Items]
Debt issuance cost amortization	0.7	0.7	1.4	1.3
Interest expense	0.4	0.7	0.9	1.7
Total interest expense	$ 1.1	$ 1.4	$ 2.3	$ 3

Debt - Settlement of debt (Deta

Debt - Settlement of debt (Details) - USD ($) $ in Millions	1 Months Ended				3 Months Ended		6 Months Ended
	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	May 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Net Loss on Inducements and Settlements					$ 3.1	$ 2.1	$ 12.2	$ 8.3
2015 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled				$ 5.6
Total Cash Consideration				18.9
Net Loss on Inducements and Settlements				0.4
2017 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled		$ 18.2		25.9
Total Cash Consideration		42.7		56.3
Net Loss on Inducements and Settlements		$ 3.1		6.6
2017 Junior Convertible Debt | Junior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled				6.5
Total Cash Consideration				14.9
Net Loss on Inducements and Settlements				$ 2.1
4.333% 2023 Notes | Senior Indebtedness | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled			$ 1,000
Total Cash Consideration			1,000
Net Loss on Inducements and Settlements			$ 0
2.670% 2023 Notes | Senior Indebtedness | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	$ 1,000
Total Cash Consideration	1,000
Net Loss on Inducements and Settlements	$ 0

Debt - Senior Credit Facilities

Debt - Senior Credit Facilities (Details) - USD ($) $ in Millions	1 Months Ended
	Aug. 31, 2023	Sep. 30, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Long-term debt		$ 6,099.2	$ 6,466.6
Term Loan Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt		$ 750	$ 0
Term Loan Facility | Line of Credit | Adjusted Term SOFR Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Term Loan Facility | Line of Credit | Adjusted Term SOFR Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Term Loan Facility | Line of Credit | Alternate Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.125%
Term Loan Facility | Line of Credit | Alternate Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%

Debt - Commercial Paper Notes (

Debt - Commercial Paper Notes (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Line of Credit Facility [Line Items]
Long-term debt	$ 6,099.2	$ 6,466.6
Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,750
Maturity from the date of issue	397 days
Long-term debt	$ 1,000	$ 0
Weighted average interest rate	5.64%

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	$ 6,075.8	$ 6,439.9
Carrying Amount | Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	996.7	0
Carrying Amount | Revolving Credit Facility | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	31.9	91.4
Carrying Amount | Term Loan Facility | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	749.1	0
Carrying Amount | 4.333% 2023 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	999.4
Carrying Amount | 2.670% 2023 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	999.4
Carrying Amount | 0.972% 2024 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,399.2	1,398.2
Carrying Amount | 0.983% 2024 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	998.7	997.9
Carrying Amount | 4.250% 2025 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,193.3	1,191.8
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	12.4
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	37.8	81.8
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	662.4	661.1
Carrying Amount | 2017 Junior Convertible Debt | Junior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	6.5
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	6,082.7	6,516
Fair Value | Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,000	0
Fair Value | Revolving Credit Facility | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	39	100
Fair Value | Term Loan Facility | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	750	0
Fair Value | 4.333% 2023 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	997.1
Fair Value | 2.670% 2023 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0	985.4
Fair Value | 0.972% 2024 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,374.1	1,337.6
Fair Value | 0.983% 2024 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	955.1	941.9
Fair Value | 4.250% 2025 Notes | Senior Indebtedness
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,162.9	1,176
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	23.6	41.8
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	84.1	189.6
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	693.9	732.1
Fair Value | 2017 Junior Convertible Debt | Junior Subordinated Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	$ 0	$ 14.5

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (4,612)	$ (4,344.7)
Gross Amount	7,700.8	7,713.7
Net Amount	3,088.8	3,369
Amortization Expense
2024	343.9
2025	554.9
2026	485.3
2027	383.6
2028	$ 297.9
Minimum
Amortization Expense
Useful life	1 year
Maximum
Amortization Expense
Useful life	15 years
In-process research and development
Indefinite-lived Intangible Assets [Line Items]
In-process research and development		5.7
Core and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 7,285	7,296.2
Accumulated Amortization	(4,371.9)	(4,103.4)
Net Amount	2,913.1	3,192.8
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Amount	196.7	199.8
Accumulated Amortization	(132.8)	(128)
Net Amount	63.9	71.8
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross Amount	219.1	211.7
Accumulated Amortization	(107.3)	(113)
Net Amount	$ 111.8	98.7
Distribution rights and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount		0.3
Accumulated Amortization		(0.3)
Net Amount		$ 0

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Amortization of Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 172,000,000	$ 188,200,000	$ 344,400,000	$ 375,900,000
Impairment of intangible assets	600,000	0	1,100,000	0
Amortization expense charged to cost of sales
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	3,000,000	3,900,000	6,000,000	7,200,000
Amortization expense charged to operating expense
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 169,000,000	$ 184,300,000	$ 338,400,000	$ 368,700,000

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions	6 Months Ended
	Sep. 30, 2023 USD ($) reporting_unit	Mar. 31, 2023 USD ($)
Goodwill By Reporting Segment [Line Items]
Goodwill	$ 6,675.4	$ 6,673.6
Number of reporting units | reporting_unit	2
Semiconductor Products Reporting Unit
Goodwill By Reporting Segment [Line Items]
Goodwill	$ 6,656.2	6,654.4
Additions	1.8
Technology Licensing Reporting Unit
Goodwill By Reporting Segment [Line Items]
Goodwill	19.2	$ 19.2
Additions	$ 0

Other Financial Statement Det_3

Other Financial Statement Details - Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	$ 1,714.5		$ 1,714.5		$ 1,313.9
Less: allowance for expected credit losses	8.3		8.3		8.6
Total accounts receivable, net	1,706.2		1,706.2		1,305.3
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	1,702.2		1,702.2		1,300.4
Accounts Receivable, Sale	0	$ 186.2	64.9	$ 354.9
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable, gross	$ 12.3		$ 12.3		$ 13.5

Other Financial Statement Det_4

Other Financial Statement Details - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 181.6	$ 192.6
Work in process	859.6	809.8
Finished goods	289.7	322.5
Total inventories	$ 1,330.9	$ 1,324.9

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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,952.4		$ 3,952.4		$ 3,829.1
Less: accumulated depreciation and amortization	2,745.5		2,745.5		2,651.2
Total property, plant and equipment, net	1,206.9		1,206.9		1,177.9
Depreciation expense	47	$ 63.6	97.5	$ 135.3
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	746.6		746.6		716.4
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,743.9		2,743.9		2,669.1
Projects in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 372.6		$ 372.6		$ 354.3

Other Financial Statement Det_6

Other Financial Statement Details - Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and benefits	$ 182.1	$ 193.5
Income taxes payable	107.9	106.2
Deferred revenue	175.7	121.4
Sales related reserves	727.2	536.1
Current portion of lease liabilities	32.3	31.5
Accrued expenses and other liabilities	242.8	334.8
Total accrued liabilities	$ 1,468	$ 1,323.5

Commitment and Contingencies -

Commitment and Contingencies - Total Purchase Commitments (Details) $ in Millions	Sep. 30, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2024	$ 586.9
2025	219.7
2026	231.4
2027	196.9
2028	171
Thereafter	196.3
Total	$ 1,602.2

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended
	Jun. 30, 2010 plaintiff	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued		$ 150
Individual Labor Actions by former LFR Employees.
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | plaintiff	500
Indemnification Agreement
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss		$ 189

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details)	6 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Effective tax rate	20.68%

Share-Based Compensation - Shar

Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 45.4	$ 41.3	$ 89.9	$ 82.5
Income tax benefit	9.6	8.8	19	17.6
Net income effect of share-based compensation	35.8	32.5	70.9	64.9
Inventory
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capitalized share-based compensation expense	4.7	4.7	9.9	9.5
Share-based compensation expense previously capitalized	7.4	6.5	14.2	14.2
Cost of sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	7.4	6.5	14.2	14.2
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	23.7	19.8	46.6	39.9
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 14.3	$ 15	$ 29.1	$ 28.4

Stock Repurchase Activity (Deta

Stock Repurchase Activity (Details) - USD ($)	3 Months Ended				6 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Mar. 31, 2023	Nov. 30, 2021
Equity [Abstract]
Stock repurchase program, authorized amount							$ 4,000,000,000
Repurchased shares under authorization (in shares)	4,200,000				6,000,000
Repurchased shares under authorization, value	$ 342,300,000	$ 141,200,000	$ 247,200,000	$ 195,200,000	$ 483,500,000
Stock repurchase program, remaining authorized repurchase amount	$ 2,150,000,000				$ 2,150,000,000
Common stock held in treasury (in shares)	36,762,009				36,762,009	32,345,809

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, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Changes in the components of AOCI
Beginning balance	$ 6,831.3	$ 6,513.6	$ 5,977.9	$ 5,894.8	$ 6,513.6	$ 5,894.8
Net other comprehensive income	1.6	(0.3)	5	4	1.3	9
Ending balance	6,968.5	6,831.3	6,103.1	5,977.9	6,968.5	6,103.1
Total
Changes in the components of AOCI
Beginning balance	(4.4)	(4.1)	(16.6)	(20.6)	(4.1)	(20.6)
Net other comprehensive income	1.6	(0.3)	5	4	1.3
Ending balance	(2.8)	(4.4)	$ (11.6)	$ (16.6)	(2.8)	$ (11.6)
Minimum Pension Liability
Changes in the components of AOCI
Beginning balance		11			11
Net other comprehensive income					1.3
Ending balance	12.3				12.3
Foreign Currency
Changes in the components of AOCI
Beginning balance		$ (15.1)			(15.1)
Net other comprehensive income					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, 2023	Nov. 02, 2023	Sep. 05, 2023	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Dividends [Abstract]
Cash dividend paid (in dollars per share)			$ 0.410
Dividends Payable [Line Items]
Dividends declared per common share (in dollars per share)				$ 0.410		$ 0.301		$ 0.793	$ 0.577
Cash dividend			$ 222.7	$ 222.7	$ 208.9	$ 166.1	$ 153
Subsequent Event
Dividends Payable [Line Items]
Dividends declared per common share (in dollars per share)		$ 0.439
Forecast
Dividends Payable [Line Items]
Cash dividend	$ 238