Skyworks Solutions (SWKS) 10-Q 8 May 23 2023 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - $ / shares	6 Months Ended
	Mar. 31, 2023	May 02, 2023
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2023
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-05560
Entity Registrant Name	Skyworks Solutions, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2302115
Entity Address, Address Line One	5260 California Avenue
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92617
City Area Code	(949)
Local Phone Number	231-3000
Title of 12(b) Security	Common Stock, par value $0.25 per share
Trading Symbol	SWKS
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		159,154,716
Entity Listing, Par Value Per Share	$ 0.25
Entity Central Index Key	0000004127
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--09-29

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Income Statement [Abstract]
Document Period End Date			Mar. 31, 2023
Net revenue	$ 1,153.1	$ 1,335.6	$ 2,482.4	$ 2,846
Cost of goods sold	625.7	698	1,317.4	1,493.6
Gross profit	527.4	637.6	1,165	1,352.4
Operating expenses:
Research and development	148.2	160.7	312	311.9
Selling, general, and administrative	79	83	163.5	165.1
Amortization of intangibles	51.4	65.9	123.4	145.9
Restructuring Costs and Asset Impairment Charges	23.1	4.7	23.5	7.1
Total operating expenses	254.1	270.3	524.7	539.3
Operating income	273.3	367.3	640.3	813.1
Interest Expense	(18.9)	(11.4)	(35.8)	(22.3)
Other income (expense), net	5.4	(1.8)	6	(0.5)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	259.8	354.1	610.5	790.3
Provision for income taxes	27	48.3	68.3	84.6
Net income	$ 232.8	$ 305.8	$ 542.2	$ 705.7
Earnings per share:
Basic (in dollars per share)	$ 1.46	$ 1.87	$ 3.40	$ 4.29
Diluted (in dollars per share)	$ 1.46	$ 1.86	$ 3.39	$ 4.27
Weighted average shares:
Basic (in shares)	159.1	163.7	159.5	164.4
Diluted (in shares)	159.9	164.4	160.1	165.4
Common Stock, Dividends, Per Share, Declared	$ 0.62	$ 0.56	$ 1.24	$ 1.12
Amortization of intangibles	$ 51.4	$ 65.9	$ 123.4	$ 145.9
Operating Expense [Member]
Operating expenses:
Amortization of intangibles	3.8	21.9	25.7	55.2
Amortization of intangibles	$ 3.8	$ 21.9	$ 25.7	$ 55.2

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 232.8	$ 305.8	$ 542.2	$ 705.7
Other comprehensive income (loss), net of tax:
Fair value of investments	0	(0.3)	0	(0.4)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	0	0	(0.8)	3.3
Comprehensive income	$ 232.8	$ 305.5	$ 541.4	$ 708.6

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Document Period End Date	Mar. 31, 2023
Current assets:
Cash and cash equivalents	$ 832,600	$ 566,000
Marketable Securities, Current	228,800	20,300
Receivables, net of allowances of $0.9 and $0.8, respectively	685,000	1,094,000
Inventory	1,257,000	1,212,100
Other current assets	395,800	337,500
Total current assets	3,399,200	3,229,900
Property, plant, and equipment, net	1,496,300	1,604,800
Operating Lease, Right-of-Use Asset	210,800	223,000
Goodwill	2,176,700	2,176,700
Intangible assets, net	1,321,600	1,444,700
Deferred Income Tax Assets, Net	118,900	52,700
Marketable Securities, Noncurrent	0	500
Other long-term assets	118,200	141,500
Total assets	8,841,700	8,873,800
Current liabilities:
Accounts payable	165,800	274,200
Accrued compensation and benefits	103,500	114,300
Debt, Current	499,800	499,200
Other current liabilities	399,600	339,200
Total current liabilities	1,168,700	1,226,900
Long-term Debt	1,491,100	1,689,900
Long-term tax liabilities	196,300	213,500
Operating Lease, Liability, Noncurrent	199,500	206,900
Other long-term liabilities	53,200	67,600
Total liabilities	3,108,800	3,404,800
Stockholders’ equity:
Preferred stock, no par value: 25.0 shares authorized, no shares issued	0	0
Common stock, $0.25 par value: 525.0 shares authorized; 159.2 shares issued and outstanding at March 31, 2023, and 160.2 shares issued and outstanding at September 30, 2022	39,700	40,000
Additional paid-in capital	56,200	11,900
Retained earnings	5,642,600	5,421,900
Accumulated other comprehensive loss	(5,600)	(4,800)
Total stockholders’ equity	5,732,900	5,469,000
Total liabilities and stockholders’ equity	$ 8,841,700	$ 8,873,800

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Current assets:
Allowance for doubtful accounts	$ 0.9	$ 0.8
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	25	25
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized	525	525
Common stock, shares issued	159.2	160.2
Common stock, shares outstanding	159.2	160.2

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Statement of Cash Flows [Abstract]
Document Period End Date	Mar. 31, 2023
Net income	$ 542.2	$ 705.7
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	90.4	106.1
Depreciation	198.4	192.6
Amortization	123.4	153.3
Deferred income taxes	(57)	6.4
Asset Impairment Charges	17	0
Amortization of Debt Issuance Costs and Discounts	2	2
Other Noncash Income (Expense)	2.2	1.4
Changes in assets and liabilities:
Receivables, net	409	(41.9)
Inventory	(49.4)	(51.4)
Accounts payable	(94.7)	15
Other current and long-term assets and liabilities	1.6	(114.7)
Net Cash Provided by (Used in) Operating Activities	1,185.1	974.5
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	108.9	222.5
Payments to Acquire Marketable Securities	(270.4)	(78.6)
Payments to Acquire Intangible Assets	15.1	14
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	65.1	100.7
Proceeds from Sale of Property, Plant, and Equipment	0.1	0
Net Cash Provided by (Used in) Investing Activities	(329.2)	(214.4)
Cash flows from financing activities:
Repurchase of common stock - payroll tax withholdings on equity awards	(32.6)	(83.6)
Repurchase of common stock - stock repurchase program	(175.3)	(687.4)
Dividends paid	(198)	(183.7)
Net proceeds from exercise of stock options	1.1	2.6
Proceeds from Issuance of Common Stock	15.5	15.5
Repayments of Long-term Debt	(200)	(50)
Net Cash Provided by (Used in) Financing Activities	(589.3)	(986.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	266.6	(226.5)
Cash and cash equivalents at beginning of period	566	882.9
Cash and cash equivalents at end of period	832.6	656.4
Supplemental cash flow disclosures:
Income taxes paid	118.1	138.4
Interest Paid, Excluding Capitalized Interest, Operating Activities	33.8	18.8
Stock Issued	19.2	32.2
Capital Expenditures Incurred but Not yet Paid	27.4	77.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 3.4	$ 57.2

Statement of Stockholders Equit

Statement of Stockholders Equity Statement - USD ($) $ in Thousands, shares in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common
Common stock, shares outstanding		165.3
Stockholders' Equity Attributable to Parent	$ 5,297,100	$ 41,300	$ 79,600	$ 5,185,800	$ (7,900)	$ (1,700)
Treasury Stock, Common, Shares						0
Net income	399,900			399,900
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.9				0.5
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(46,100)	$ 200	33,800			$ (80,100)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	42,000		42,000
Stock Repurchased During Period, Value	269,400	$ 400	(400)			$ 269,400
Stock Repurchased During Period, Shares		1.7				1.7
Dividends	(92,500)			(92,500)
Other Comprehensive Income (Loss), Net of Tax	(3,200)				3,200
Net income	705,700
Common stock, shares outstanding		164.5
Stockholders' Equity Attributable to Parent	5,334,200	$ 41,100	155,800	5,493,200	(4,700)	$ (351,200)
Treasury Stock, Common, Shares						2.2
Net income	305,800			305,800
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.2				0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	12,800	$ 0	16,300			$ (3,500)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	45,300		45,300
Stock Repurchased During Period, Value	418,000	$ 700	(700)			$ 418,000
Stock Repurchased During Period, Shares		3				3
Dividends	(91,200)			(91,200)
Other Comprehensive Income (Loss), Net of Tax	300				(300)
Common stock, shares outstanding		161.7
Stockholders' Equity Attributable to Parent	$ 5,188,600	$ 40,400	218,100	5,707,800	(5,000)	$ (772,700)
Treasury Stock, Common, Shares						5.2
Common stock, shares outstanding	160.2	160.2
Stockholders' Equity Attributable to Parent	$ 5,469,000	$ 40,000	11,900	5,421,900	(4,800)	$ 0
Treasury Stock, Common, Shares						0
Net income	309,400			309,400
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.7				0.3
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(11,700)	$ 200	20,000			$ (31,900)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	49,700		49,700
Stock Repurchased and Retired During Period, Shares		(1.8)				(0.3)
Stock Repurchased and Retired During Period, Value	(166,300)	$ (500)	(77,700)	(120,000)		$ (31,900)
Dividends	(99,400)			(99,400)
Other Comprehensive Income (Loss), Net of Tax	800				(800)
Net income	542,200
Common stock, shares outstanding		159.1
Stockholders' Equity Attributable to Parent	5,549,900	$ 39,700	3,900	5,511,900	(5,600)	$ 0
Treasury Stock, Common, Shares						0
Net income	232,800			232,800
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.2				0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	14,900	$ 0	15,600			$ (700)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	43,000		43,000
Stock Repurchased and Retired During Period, Shares		(0.1)				0
Stock Repurchased and Retired During Period, Value	(9,100)	$ 0	(6,300)	(3,500)		$ (700)
Dividends	(98,600)			(98,600)
Other Comprehensive Income (Loss), Net of Tax	$ 0				0
Common stock, shares outstanding	159.2	159.2
Stockholders' Equity Attributable to Parent	$ 5,732,900	$ 39,700	$ 56,200	$ 5,642,600	$ (5,600)	$ 0
Remaining amount authorized fro stock repurchase	$ 2,000,000
Treasury Stock, Common, Shares						0

Description Of Business and Bas

Description Of Business and Basis Of Presentation	6 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Skyworks Solutions, Inc., together with its consolidated subsidiaries (“Skyworks” or the “Company”), is empowering the wireless networking revolution. The Company’s analog and mixed-signal semiconductors are connecting people, places, and things, spanning a number of new applications within the aerospace, automotive, broadband, cellular infrastructure, connected home, defense, entertainment and gaming, industrial, medical, smartphone, tablet, and wearable markets. The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. Certain information and footnote disclosures, normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), have been condensed or omitted pursuant to those rules and regulations. However, in management’s opinion, the financial information reflects all adjustments, including those of a normal recurring nature, necessary to present fairly the results of operations, financial position, and cash flows of the Company for the periods presented. The results of operations, financial position, and cash flows for the Company during the interim periods are not necessarily indicative of those expected for the full year. This information should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022, filed with the SEC on November 23, 2022, as amended by Amendment No. 1 to such Annual Report on Form 10-K, filed with the SEC on January 27, 2023 (“2022 10-K”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts of assets, liabilities, revenue, expenses, comprehensive income, and accumulated other comprehensive loss that are reported during the reporting period. The Company evaluates its estimates on an ongoing basis using historical experience and other factors, including the current economic environment. Judgment is required in determining the reserves for, and fair value of, items such as overall fair value assessments of assets and liabilities, particularly those classified as Level 2 or Level 3 in the fair value hierarchy, marketable securities, inventory, intangible assets associated with business combinations, share-based compensation, revenue reserves, loss contingencies, and income taxes. In addition, judgment is required in determining whether a potential indicator of impairment of long-lived assets exists and in estimating future cash flows for any necessary impairment testing. Actual results could differ significantly from these estimates.

Marketable Securities

Marketable Securities	6 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	3. MARKETABLE SECURITIES The Company’s portfolio of available-for-sale marketable securities consists of the following (in millions): Current Noncurrent March 31, September 30, March 31, September 30, U.S. Treasury and government securities $ 164.5 $ 13.1 $ — $ 0.5 Corporate bonds and notes 63.7 0.2 — — Municipal bonds 0.6 7.0 — — Total marketable securities $ 228.8 $ 20.3 $ — $ 0.5

Fair Value

Fair Value	6 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
FAIR VALUE	4. FAIR VALUE Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis The Company groups its financial assets and liabilities measured at fair value on a recurring basis in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1 - Quoted prices in active markets for identical assets or liabilities. • Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less-active markets), or model-driven valuations in which all significant inputs are observable or can be derived principally from, or corroborated with, observable market data. • Level 3 - Fair value is derived from valuation techniques in which one or more significant inputs are unobservable, including assumptions and judgments made by the Company. Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions): As of March 31, 2023 September 30, 2022 Fair Value Measurements Fair Value Measurements Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets Cash and cash equivalents (1) $ 832.6 $ 624.9 $ 207.7 $ — $ 566.0 $ 565.7 $ 0.3 $ — U.S. Treasury and government securities 164.5 8.2 156.3 — 13.6 3.6 10.0 — Corporate bonds and notes 63.7 — 63.7 — 0.2 — 0.2 — Municipal bonds 0.6 — 0.6 — 7.0 — 7.0 — Total assets at fair value $ 1,061.4 $ 633.1 $ 428.3 $ — $ 586.8 $ 569.3 $ 17.5 $ — (1) Cash equivalents included in Levels 1 and 2 consist of money market funds and corporate bonds and notes, commercial paper, and agency securities purchased with less than ninety days until maturity. Assets Measured and Recorded at Fair Value on a Nonrecurring Basis The Company’s non-financial assets and liabilities, such as goodwill, intangible assets, and other long-lived assets resulting from business combinations, are measured at fair value using income approach valuation methodologies at the date of acquisition and are subsequently re-measured if there are indicators of impairment. During the three and six months ended March 31, 2023, the Company recorded impairment charges of $17.0 million. There were no indicators of impairment identified during the three and six months ended April 1, 2022. Fair Value of Debt The Company’s debt is carried at amortized cost and is measured at fair value quarterly for disclosure purposes. The estimated fair values are based on Level 2 inputs as the fair value is based on quoted prices for the Company’s debt and comparable instruments in inactive markets. The carrying value of the Term Loans (as defined below) approximates their fair value as the Term Loans are carried at a market observable interest rate that resets periodically. The carrying amount and estimated fair value of debt consists of the following (in millions): As of March 31, September 30, Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value 0.90% Senior Notes due 2023 $ 499.8 $ 495.6 $ 499.2 $ 488.5 1.80% Senior Notes due 2026 497.3 452.9 496.8 431.2 3.00% Senior Notes due 2031 494.8 420.5 494.5 377.6 Total debt under Senior Notes $ 1,491.9 $ 1,369.0 $ 1,490.5 $ 1,297.3

Inventory

Inventory	6 Months Ended
	Mar. 31, 2023
Inventory, Net [Abstract]
INVENTORY	INVENTORY Inventory consists of the following (in millions): As of March 31, September 30, Raw materials $ 80.7 $ 81.3 Work-in-process 762.5 805.3 Finished goods 411.2 322.5 Finished goods held on consignment by customers 2.6 3.0 Total inventory $ 1,257.0 $ 1,212.1

Property, Plant And Equipment

Property, Plant And Equipment	6 Months Ended
	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT, NET Property, plant, and equipment, net consists of the following (in millions): As of March 31, September 30, Land and improvements $ 11.8 $ 11.9 Buildings and improvements 570.9 555.6 Furniture and fixtures 74.4 70.1 Machinery and equipment 3,363.9 3,316.3 Construction in progress 110.5 157.2 Total property, plant, and equipment, gross 4,131.5 4,111.1 Accumulated depreciation (2,635.2) (2,506.3) Total property, plant, and equipment, net $ 1,496.3 $ 1,604.8

Goodwill And Intangible Assets

Goodwill And Intangible Assets	6 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS	7. GOODWILL AND INTANGIBLE ASSETS There were no changes to the carrying amount of goodwill during the three and six months ended March 31, 2023. The Company tests its goodwill for impairment annually as of the first day of its fourth fiscal quarter and in interim periods if certain events occur indicating the carrying value of goodwill may be impaired. There were no indicators of impairment noted during the three and six months ended March 31, 2023. Intangible assets consist of the following (in millions): As of As of Weighted March 31, 2023 September 30, 2022 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships and backlog 2.3 $ 154.6 $ (147.5) $ 7.1 $ 154.6 $ (122.3) $ 32.3 Developed technology and other 6.1 1,290.4 (295.5) 994.9 1,280.9 (209.2) 1,071.7 Technology licenses 2.7 74.3 (26.0) 48.3 105.1 (45.2) 59.9 In-process research and development 271.3 — 271.3 280.8 — 280.8 Total intangible assets $ 1,790.6 $ (469.0) $ 1,321.6 $ 1,821.4 $ (376.7) $ 1,444.7 Fully amortized intangible assets are eliminated from both the gross and accumulated amortization amounts in the first quarter of each fiscal year. During the three and six months ended March 31, 2023, $1.8 million and $9.5 million of in-process research and development (“IPR&D”) assets were transferred to definite-lived intangible assets, and are being amortized over their useful lives of 12.0 years, respectively. Amortization expense related to definite-lived intangible assets was $51.4 million and $123.4 million for the three and six months ended March 31, 2023, respectively. Amortization expense related to definite-lived intangible assets was $65.9 million and $145.9 million for the three and six months ended April 1, 2022, respectively. Annual amortization expense for the next five fiscal years related to definite-lived intangible assets, excluding IPR&D, is expected to be as follows (in millions): Remaining 2023 2024 2025 2026 2027 Thereafter Amortization expense $ 102.6 $ 178.5 $ 155.0 $ 127.2 $ 111.8 $ 375.2

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The provision for income taxes consists of the following components (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, United States income taxes $ 16.1 $ 34.3 $ 42.5 $ 52.7 Foreign income taxes 10.9 14.0 25.8 31.9 Provision for income taxes $ 27.0 $ 48.3 $ 68.3 $ 84.6 Effective tax rate 10.4 % 13.7 % 11.2 % 10.7 %

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal Matters From time to time, various lawsuits, claims, and proceedings have been, and may in the future be, instituted or asserted against the Company, including those pertaining to patent infringement, intellectual property, environmental hazards, product liability and warranty, safety and health, employment, and contractual matters. The semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights. From time to time, third parties have asserted and may in the future assert patent, copyright, trademark, and other intellectual property rights to technologies that are important to the Company’s business and have demanded and may in the future demand that the Company license their technology. The outcome of any such litigation cannot be predicted with certainty and some such lawsuits, claims, or proceedings may be disposed of unfavorably to the Company. Generally speaking, intellectual property disputes often have a risk of injunctive relief, which, if imposed against the Company, could materially and adversely affect the Company’s financial condition or results of operations. From time to time the Company may also be involved in legal proceedings in the ordinary course of business. The Company monitors the status of legal proceedings and other contingencies on an ongoing basis to ensure loss contingencies are recognized and disclosed in its financial statements and footnotes. The Company does not believe there are any pending legal proceedings that are reasonably possible to result in a material loss. The Company is engaged in various legal actions in the normal course of business and, while there can be no assurances, the Company believes the outcome of all pending litigation involving the Company will not have, individually or in the aggregate, a material adverse effect on its business or financial statements. Guarantees and Indemnities The Company has made no significant contractual guarantees for the benefit of third parties. However, the Company generally indemnifies its customers from third-party intellectual property infringement litigation claims related to its products and, on occasion, also provides other indemnities related to product sales. In connection with certain facility leases, the Company has indemnified its lessors for certain claims arising from the facility or the lease. The Company indemnifies its directors and officers to the maximum extent permitted under the laws of the state of Delaware. The duration of the indemnities varies and in many cases is indefinite. The indemnities to customers in connection with product sales generally are subject to limits based upon the amount of the related product sales and in many cases are subject to geographic and other restrictions. In certain instances, the Company’s indemnities do not provide for any limitation of the maximum potential future payments the Company could be obligated to make. The Company has not recorded any liability for these indemnities in the accompanying consolidated balance sheets and does not expect that such obligations will have a material adverse impact on its financial statements.

Stockholder's Equity

Stockholder's Equity	6 Months Ended
	Mar. 31, 2023
Stockholders' Equity Note [Abstract]
Equity [Text Block]	10. STOCKHOLDERS’ EQUITY Stock Repurchase On January 31, 2023, the Board of Directors approved a new stock repurchase program (“January 31, 2023 stock repurchase program”), pursuant to which the Company is authorized to repurchase up to $2.0 billion of its common stock from time to time through February 1, 2025, on the open market or in privately negotiated transactions, in compliance with applicable securities laws and other legal requirements. The January 31, 2023 stock repurchase program succeeds in its entirety the stock repurchase program approved by the Board of Directors on January 26, 2021 (“January 26, 2021 stock repurchase program”). The timing and amount of any shares of the Company’s common stock that are repurchased under the January 31, 2023 stock repurchase program will be determined by the Company’s management based on its evaluation of market conditions and other factors. The January 31, 2023 stock repurchase program may be suspended or discontinued at any time. The Company currently expects to fund the January 31, 2023 stock repurchase program using the Company’s working capital. During the three months ended March 31, 2023, the Company paid $9.1 million (including commissions) in connection with the repurchase of 0.1 million shares of its common stock (paying an average price of $91.08 per share). During the six months ended March 31, 2023, the Company paid $175.3 million (including commissions) in connection with the repurchase of 1.9 million shares of its common stock (paying an average price of $90.60 per share), all of which shares were repurchased pursuant to the January 26, 2021 stock repurchase program. As of March 31, 2023, $2.0 billion remained available under the January 31, 2023 stock repurchase program. During the three months ended April 1, 2022, the Company paid $418.0 million (including commissions) in connection with the repurchase of 3.0 million shares of its common stock (paying an average price of $138.46 per share). During the six months ended April 1, 2022, the Company paid $687.4 million (including commissions) in connection with the repurchase of 4.7 million shares of its common stock (paying an average price of $146.03 per share), all of which shares were repurchased pursuant to the January 26, 2021 stock repurchase program. Dividends On May 8, 2023, the Company announced that the Board of Directors had declared a cash dividend on the Company’s common stock of $0.62 per share. This dividend is payable on June 20, 2023, to the Company’s stockholders of record as of the close of business on May 30, 2023. Dividends charged to retained earnings were as follows (in millions, except per share data): 2023 2022 Per Share Total Amount Per Share Total Amount First quarter $ 0.62 $ 99.4 $ 0.56 $ 92.5 Second quarter 0.62 98.6 0.56 91.2 Total dividends $ 1.24 $ 198.0 $ 1.12 $ 183.7 Share-based Compensation The following table summarizes the share-based compensation expense by line item in the Consolidated Statements of Operations (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, Cost of goods sold $ 7.5 $ 6.3 $ 10.2 $ 14.9 Research and development 17.4 27.3 45.3 50.2 Selling, general, and administrative 16.0 22.1 34.9 41.0 Total share-based compensation $ 40.9 $ 55.7 $ 90.4 $ 106.1

Earnings Per Share

Earnings Per Share	6 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	11. EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share amounts): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, Net income $ 232.8 $ 305.8 $ 542.2 $ 705.7 Weighted average shares outstanding – basic 159.1 163.7 159.5 164.4 Dilutive effect of equity-based awards 0.8 0.7 0.6 1.0 Weighted average shares outstanding – diluted 159.9 164.4 160.1 165.4 Net income per share – basic $ 1.46 $ 1.87 $ 3.40 $ 4.29 Net income per share – diluted $ 1.46 $ 1.86 $ 3.39 $ 4.27 Anti-dilutive common stock equivalents 0.7 0.9 0.6 0.6 Basic earnings per share are calculated by dividing net income by the weighted average number of shares of the Company’s common stock outstanding during the period. The calculation of diluted earnings per share includes the dilutive effect of equity-based awards that were outstanding during the three and six months ended March 31, 2023, and April 1, 2022, using the treasury stock method. Shares issuable upon the vesting of performance stock awards are likewise included in the calculation of diluted earnings per share as of the date the condition(s) have been satisfied, assuming the end of the reporting period was the end of the contingency period. Certain of the Company’s outstanding share-based awards, noted in the table above, were excluded because they were anti-dilutive, but they could become dilutive in the future.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	6 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	2. REVENUE RECOGNITION The Company presents net revenue by geographic area, based upon the location of the original equipment manufacturers’ (“OEMs”) headquarters, and by sales channel, as it believes that doing so best depicts how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. Individually insignificant OEMs are presented based upon the location of the Company’s direct customer, which is typically a distributor. Net revenue by geographic area is as follows (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, United States $ 846.6 $ 824.0 $ 1,874.9 $ 1,817.9 China 89.0 154.6 195.3 388.9 Taiwan 85.2 114.7 170.9 224.7 Europe, Middle East, and Africa 58.7 65.3 112.7 122.2 South Korea 55.8 157.3 91.5 252.3 Other Asia-Pacific 17.8 19.7 37.1 40.0 Total net revenue $ 1,153.1 $ 1,335.6 $ 2,482.4 $ 2,846.0 Net revenue by sales channel is as follows (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, Distributors $ 1,003.0 $ 1,057.5 $ 2,187.4 $ 2,371.1 Direct customers 150.1 278.1 295.0 474.9 Total net revenue $ 1,153.1 $ 1,335.6 $ 2,482.4 $ 2,846.0

Other Liabilities

Other Liabilities	6 Months Ended
	Mar. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Additional Financial Information Disclosure	12. SUPPLEMENTAL FINANCIAL INFORMATION Other current assets consist of the following (in millions): As of March 31, September 30, Prepaid expenses $ 268.8 $ 242.3 Other 127.0 95.2 Total other current assets $ 395.8 $ 337.5 Other current liabilities consist of the following (in millions): As of March 31, September 30, Accrued customer liabilities $ 272.2 $ 226.9 Accrued taxes 49.4 48.8 Short-term operating lease liabilities 28.6 18.5 Other 49.4 45.0 Total other current liabilities $ 399.6 $ 339.2

Description Of Business and B_2

Description Of Business and Basis Of Presentation (Policies)	6 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Period	The Company’s fiscal year ends on the Friday closest to September 30. Fiscal 2023 consists of 52 weeks and ends on September 29, 2023. Fiscal 2022 consisted of 52 weeks and ended on September 30, 2022. The three and six months ended March 31, 2023, and April 1, 2022, consisted of 13 weeks and 26 weeks, respectively.

Marketable Securities (Tables)

Marketable Securities (Tables)	6 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	The Company’s portfolio of available-for-sale marketable securities consists of the following (in millions): Current Noncurrent March 31, September 30, March 31, September 30, U.S. Treasury and government securities $ 164.5 $ 13.1 $ — $ 0.5 Corporate bonds and notes 63.7 0.2 — — Municipal bonds 0.6 7.0 — — Total marketable securities $ 228.8 $ 20.3 $ — $ 0.5

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis	Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions): As of March 31, 2023 September 30, 2022 Fair Value Measurements Fair Value Measurements Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets Cash and cash equivalents (1) $ 832.6 $ 624.9 $ 207.7 $ — $ 566.0 $ 565.7 $ 0.3 $ — U.S. Treasury and government securities 164.5 8.2 156.3 — 13.6 3.6 10.0 — Corporate bonds and notes 63.7 — 63.7 — 0.2 — 0.2 — Municipal bonds 0.6 — 0.6 — 7.0 — 7.0 — Total assets at fair value $ 1,061.4 $ 633.1 $ 428.3 $ — $ 586.8 $ 569.3 $ 17.5 $ —
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The carrying amount and estimated fair value of debt consists of the following (in millions): As of March 31, September 30, Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value 0.90% Senior Notes due 2023 $ 499.8 $ 495.6 $ 499.2 $ 488.5 1.80% Senior Notes due 2026 497.3 452.9 496.8 431.2 3.00% Senior Notes due 2031 494.8 420.5 494.5 377.6 Total debt under Senior Notes $ 1,491.9 $ 1,369.0 $ 1,490.5 $ 1,297.3

Inventory (Tables)

Inventory (Tables)	6 Months Ended
	Mar. 31, 2023
Inventory, Net [Abstract]
Schedule Of Inventories	Inventory consists of the following (in millions): As of March 31, September 30, Raw materials $ 80.7 $ 81.3 Work-in-process 762.5 805.3 Finished goods 411.2 322.5 Finished goods held on consignment by customers 2.6 3.0 Total inventory $ 1,257.0 $ 1,212.1

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule Of Property, Plant And Equipment	Property, plant, and equipment, net consists of the following (in millions): As of March 31, September 30, Land and improvements $ 11.8 $ 11.9 Buildings and improvements 570.9 555.6 Furniture and fixtures 74.4 70.1 Machinery and equipment 3,363.9 3,316.3 Construction in progress 110.5 157.2 Total property, plant, and equipment, gross 4,131.5 4,111.1 Accumulated depreciation (2,635.2) (2,506.3) Total property, plant, and equipment, net $ 1,496.3 $ 1,604.8

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets Excluding Goodwill	Intangible assets consist of the following (in millions): As of As of Weighted March 31, 2023 September 30, 2022 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships and backlog 2.3 $ 154.6 $ (147.5) $ 7.1 $ 154.6 $ (122.3) $ 32.3 Developed technology and other 6.1 1,290.4 (295.5) 994.9 1,280.9 (209.2) 1,071.7 Technology licenses 2.7 74.3 (26.0) 48.3 105.1 (45.2) 59.9 In-process research and development 271.3 — 271.3 280.8 — 280.8 Total intangible assets $ 1,790.6 $ (469.0) $ 1,321.6 $ 1,821.4 $ (376.7) $ 1,444.7
Schedule Of Expected Annual Amortization Expense Related To Intangible Assets For The Next Five Years	Annual amortization expense for the next five fiscal years related to definite-lived intangible assets, excluding IPR&D, is expected to be as follows (in millions): Remaining 2023 2024 2025 2026 2027 Thereafter Amortization expense $ 102.6 $ 178.5 $ 155.0 $ 127.2 $ 111.8 $ 375.2

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The provision for income taxes consists of the following components (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, United States income taxes $ 16.1 $ 34.3 $ 42.5 $ 52.7 Foreign income taxes 10.9 14.0 25.8 31.9 Provision for income taxes $ 27.0 $ 48.3 $ 68.3 $ 84.6 Effective tax rate 10.4 % 13.7 % 11.2 % 10.7 %

Stockholder's Equity (Tables)

Stockholder's Equity (Tables)	6 Months Ended
	Mar. 31, 2023
Stockholders' Equity Note [Abstract]
Dividends Declared	Dividends charged to retained earnings were as follows (in millions, except per share data): 2023 2022 Per Share Total Amount Per Share Total Amount First quarter $ 0.62 $ 99.4 $ 0.56 $ 92.5 Second quarter 0.62 98.6 0.56 91.2 Total dividends $ 1.24 $ 198.0 $ 1.12 $ 183.7
Schedule of share-based compensation expense	The following table summarizes the share-based compensation expense by line item in the Consolidated Statements of Operations (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, Cost of goods sold $ 7.5 $ 6.3 $ 10.2 $ 14.9 Research and development 17.4 27.3 45.3 50.2 Selling, general, and administrative 16.0 22.1 34.9 41.0 Total share-based compensation $ 40.9 $ 55.7 $ 90.4 $ 106.1

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share amounts): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, Net income $ 232.8 $ 305.8 $ 542.2 $ 705.7 Weighted average shares outstanding – basic 159.1 163.7 159.5 164.4 Dilutive effect of equity-based awards 0.8 0.7 0.6 1.0 Weighted average shares outstanding – diluted 159.9 164.4 160.1 165.4 Net income per share – basic $ 1.46 $ 1.87 $ 3.40 $ 4.29 Net income per share – diluted $ 1.46 $ 1.86 $ 3.39 $ 4.27 Anti-dilutive common stock equivalents 0.7 0.9 0.6 0.6

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, United States $ 846.6 $ 824.0 $ 1,874.9 $ 1,817.9 China 89.0 154.6 195.3 388.9 Taiwan 85.2 114.7 170.9 224.7 Europe, Middle East, and Africa 58.7 65.3 112.7 122.2 South Korea 55.8 157.3 91.5 252.3 Other Asia-Pacific 17.8 19.7 37.1 40.0 Total net revenue $ 1,153.1 $ 1,335.6 $ 2,482.4 $ 2,846.0 Net revenue by sales channel is as follows (in millions): Three Months Ended Six Months Ended March 31, April 1, March 31, April 1, Distributors $ 1,003.0 $ 1,057.5 $ 2,187.4 $ 2,371.1 Direct customers 150.1 278.1 295.0 474.9 Total net revenue $ 1,153.1 $ 1,335.6 $ 2,482.4 $ 2,846.0

Other Liabilities (Tables)

Other Liabilities (Tables)	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Other Current Liabilities	Other current liabilities consist of the following (in millions): As of March 31, September 30, Accrued customer liabilities $ 272.2 $ 226.9 Accrued taxes 49.4 48.8 Short-term operating lease liabilities 28.6 18.5 Other 49.4 45.0 Total other current liabilities $ 399.6 $ 339.2
Schedule of Other Current Assets		Other current assets consist of the following (in millions): As of March 31, September 30, Prepaid expenses $ 268.8 $ 242.3 Other 127.0 95.2 Total other current assets $ 395.8 $ 337.5

Description Of Business and B_3

Description Of Business and Basis Of Presentation (Details)	6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Period Duration	3 months	3 months

Description Of Business and B_4

Description Of Business and Basis Of Presentation (New Accounting Pronouncements) (Details)	6 Months Ended
	Mar. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Document Period End Date	Mar. 31, 2023

Marketable Securities (Details)

Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Other Current Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	$ 228.8	$ 20.3
Other Noncurrent Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Noncurrent	0	0.5
US Treasury and Government [Member] | Other Current Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	164.5	13.1
US Treasury and Government [Member] | Other Noncurrent Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Noncurrent	0	0.5
Corporate Debt Securities [Member] | Other Current Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	63.7	0.2
Corporate Debt Securities [Member] | Other Noncurrent Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Noncurrent	0	0
US States and Political Subdivisions Debt Securities [Member] | Other Current Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	0.6	7
US States and Political Subdivisions Debt Securities [Member] | Other Noncurrent Assets [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Noncurrent	$ 0	$ 0

Fair Value (Schedule Of Financi

Fair Value (Schedule Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents (1)	$ 832.6	$ 566
Assets, Fair Value Disclosure	1,061.4	586.8
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents (1)	624.9	565.7
Assets, Fair Value Disclosure	633.1	569.3
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents (1)	207.7	0.3
Assets, Fair Value Disclosure	428.3	17.5
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents (1)	0	0
Assets, Fair Value Disclosure	0	0
US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	164.5	13.6
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	8.2	3.6
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	156.3	10
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	63.7	0.2
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	63.7	0.2
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0.6	7
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0.6	7
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 0	$ 0

Fair Value , Assets and Liabili

Fair Value , Assets and Liabilities Measured on Nonrecurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	$ 1,491.9	$ 1,490.5
2026 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes, Noncurrent	497.3	496.8
2031 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes, Noncurrent	494.8	494.5
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	1,369	1,297.3
Fair Value, Inputs, Level 2 [Member] | 2026 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	452.9	431.2
Fair Value, Inputs, Level 2 [Member] | 2031 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	420.5	377.6
2023 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes, Current	499.8	499.2
2023 Notes | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-Term Debt, Fair Value	$ 495.6	$ 488.5

Inventory (Schedule Of Inventor

Inventory (Schedule Of Inventories) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Inventory, Net [Abstract]
Raw materials	$ 80.7	$ 81.3
Work-in-process	762.5	805.3
Finished goods	411.2	322.5
Finished goods held on consignment by customers	2.6	3
Total inventory	$ 1,257	$ 1,212.1

Property, Plant and Equipment_2

Property, Plant and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Property, Plant and Equipment
Total property, plant, and equipment, gross	$ 4,131.5	$ 4,111.1
Accumulated depreciation	(2,635.2)	(2,506.3)
Total property, plant, and equipment, net	1,496.3	1,604.8
Land and improvements [Member]
Property, Plant and Equipment
Total property, plant, and equipment, gross	11.8	11.9
Building and improvements [Member]
Property, Plant and Equipment
Total property, plant, and equipment, gross	570.9	555.6
Furniture and fixtures [Member]
Property, Plant and Equipment
Total property, plant, and equipment, gross	74.4	70.1
Machinery and equipment [Member]
Property, Plant and Equipment
Total property, plant, and equipment, gross	3,363.9	3,316.3
Construction in progress [Member]
Property, Plant and Equipment
Total property, plant, and equipment, gross	$ 110.5	$ 157.2

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (469)	$ (376.7)
Total intangible assets, Gross Carrying Amount	1,790.6	1,821.4
Total intangible assets, Net Carrying Amount	$ 1,321.6	1,444.7
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	2 years 3 months 18 days
Finite-Lived Intangible Assets, Gross	$ 154.6	154.6
Accumulated Amortization	(147.5)	(122.3)
Net Carrying Amount	$ 7.1	32.3
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	2 years 8 months 12 days
Finite-Lived Intangible Assets, Gross	$ 74.3	105.1
Accumulated Amortization	(26)	(45.2)
Net Carrying Amount	48.3	59.9
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	0	0
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 271.3	280.8
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	6 years 1 month 6 days
Finite-Lived Intangible Assets, Gross	$ 1,290.4	1,280.9
Accumulated Amortization	(295.5)	(209.2)
Net Carrying Amount	$ 994.9	$ 1,071.7
Developed Technology Rights | Silicon Labs Industrial and Automotive Business
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	12 years

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Schedule Of Expected Annual Amortization Expense Related To Intangible Assets For The Next Five Years) (Details) $ in Millions	Mar. 31, 2023 USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Remaining 2019	$ 102.6
2020	155
2021	127.2
2022	111.8
Thereafter	375.2
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 178.5

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Period Increase (Decrease)			$ 0
Amortization of intangibles	$ 51,400	$ 65,900	123,400	$ 145,900
Completed and transferred in-process research and development	$ 1,800		$ 9,500

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Income Tax Disclosure [Abstract]
Document Period End Date			Mar. 31, 2023
United States income taxes	$ 16.1	$ 34.3	$ 42.5	$ 52.7
Foreign income taxes	10.9	14	25.8	31.9
Provision for income taxes	$ 27	$ 48.3	$ 68.3	$ 84.6
Effective tax rate	10.40%	13.70%	11.20%	10.70%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21%
Accrued income taxes, current	$ 49.4	$ 48.8

Stockholder's Equity (Share Rep

Stockholder's Equity (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Equity, Class of Treasury Stock [Line Items]
Stock repurchased	$ 9.1	$ 418	$ 175.3	$ 687.4
Treasury Stock, Shares, Acquired	0.1	3	1.9	4.7
Average price of stock repurchased (in dollars per share)	$ (91.08)	$ (138.46)	$ (90.60)	$ (146.03)
Remaining amount authorized fro stock repurchase	$ 2,000		$ 2,000

Stockholder's Equity (Dividend)

Stockholder's Equity (Dividend) (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended				6 Months Ended
	Jun. 20, 2023	May 30, 2023	May 08, 2023	Mar. 31, 2023	Dec. 30, 2022	Apr. 01, 2022	Dec. 31, 2021	Mar. 31, 2023	Apr. 01, 2022
Dividends Payable [Line Items]
Document Period End Date								Mar. 31, 2023
Payments of Ordinary Dividends								$ 198	$ 183.7
Payments of ordinary dividends				$ 98.6	$ 99.4	$ 91.2	$ 92.5	$ 198	$ 183.7
Common Stock, Dividends, Per Share, Declared				$ 0.62	$ 0.62	$ 0.56	$ 0.56	$ 1.24	$ 1.12
Subsequent Event [Member] | Dividend Declared [Member]
Dividends Payable [Line Items]
Dividend declaration date			May 08, 2023
dividends date to be paid	Jun. 20, 2023
Dividends date of record		May 30, 2023
Cash dividends declared and paid per share (usd per share)			$ 0.62

Stockholder's Equity (Share Bas

Stockholder's Equity (Share Based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Document Period End Date			Mar. 31, 2023
Share-based compensation expense	$ 40.9	$ 55.7	$ 90.4	$ 106.1
Cost of sales [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	7.5	6.3	10.2	14.9
Research and development [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	17.4	27.3	45.3	50.2
Selling, general and administrative [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 16	$ 22.1	$ 34.9	$ 41

Earnings Per Share (Schedule Of

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2023	Dec. 30, 2022	Apr. 01, 2022	Dec. 31, 2021	Mar. 31, 2023	Apr. 01, 2022
Earnings Per Share [Abstract]
Net income	$ 232.8	$ 309.4	$ 305.8	$ 399.9	$ 542.2	$ 705.7
Weighted average shares outstanding - basic (shares)	159.1		163.7		159.5	164.4
Dilutive effect of equity based awards (shares)	0.8		0.7		0.6	1
Weighted average shares outstanding - diluted (shares)	159.9		164.4		160.1	165.4
Net income per share - basic (usd per share)	$ 1.46		$ 1.87		$ 3.40	$ 4.29
Net income per share - diluted (usd per share)	$ 1.46		$ 1.86		$ 3.39	$ 4.27
Anti-dilutive common stock equivalents (shares)	0.7		0.9		0.6	0.6

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Disaggregation of Revenue [Line Items]
Document Period End Date			Mar. 31, 2023
Revenues	$ 1,153.1	$ 1,335.6	$ 2,482.4	$ 2,846
Revenue from Contract with Customer, Excluding Assessed Tax	1,153.1	1,335.6	2,482.4	2,846
Sales Channel, Through Intermediary
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,003	1,057.5	2,187.4	2,371.1
Sales Channel, Directly to Consumer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	150.1	278.1	295	474.9
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	846.6	824	1,874.9	1,817.9
CHINA
Disaggregation of Revenue [Line Items]
Revenues	89	154.6	195.3	388.9
KOREA, REPUBLIC OF
Disaggregation of Revenue [Line Items]
Revenues	55.8	157.3	91.5	252.3
TAIWAN, PROVINCE OF CHINA
Disaggregation of Revenue [Line Items]
Revenues	85.2	114.7	170.9	224.7
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	58.7	65.3	112.7	122.2
Asia, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 17.8	$ 19.7	$ 37.1	$ 40

Other Liabilities (Details)

Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Condensed Financial Information Disclosure [Abstract]
Accrued income taxes, current	$ 49,400	$ 48,800
Operating Lease, Liability, Current	28,600	18,500
Contract with Customer, Refund Liability	272,200	226,900
Other miscellaneous current liabilities [Line Items]	49,400	45,000
Other Accrued Liabilities, Current	399,600	339,200
Other Assets, Current	395,800	337,500
Prepaid Expense, Current	268,800	242,300
Other miscellaneous current assets	$ 127,000	$ 95,200

Uncategorized Items - swks-2023

Label	Element	Value
2023 Stock Repurchase Plan [Member]
Stock Repurchase Program, Authorized Amount	us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 2,000,000,000
2023 Stock Repurchase Plan [Member] | Subsequent Event [Member]
Stock Repurchase Program Expiration Date	us-gaap_StockRepurchaseProgramExpirationDate	Feb. 01, 2025