0000004127-20-000058 | 10-K | XBRL Viewer

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Oct. 02, 2020	Nov. 11, 2020	Mar. 27, 2020
Document and Entity Information [Abstract]
Document Transition Report	false
Document Annual Report	true
Trading Symbol	SWKS
Title of 12(b) Security	Common Stock, par value $0.25 per share
Local Phone Number	231-3000
Entity Address, Address Line One	5260 California Avenue
Entity Incorporation, State or Country Code	DE
Entity Registrant Name	Skyworks Solutions, Inc.
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Central Index Key	0000004127
Document Type	10-K
Document Period End Date	Oct. 02, 2020
Entity File Number	001-05560
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--10-02
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 14.5
Entity Common Stock, Shares Outstanding		166,081,720
Entity Tax Identification Number	04-2302115
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92617
City Area Code	(949)
Security Exchange Name	NASDAQ
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true

Consolidated Statements Of Operations - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Income Statement [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,355,700	$ 3,376,800	$ 3,868,000
Cost of Goods and Services Sold	1,742,800	1,773,000	1,917,300
Gross profit	1,612,900	1,603,800	1,950,700
Operating expenses:
Research and development	464,100	424,100	404,500
Selling, general and administrative	231,400	198,300	207,800
Amortization of intangibles	11,800	22,600	18,300
Restructuring and other charges	13,800	6,800	800
Total operating expenses	721,100	651,800	631,400
Operating income	891,800	952,000	1,319,300
Other income (expense), net	(100)	9,000	12,800
Income before income taxes	891,700	961,000	1,332,100
Provision for income taxes	76,900	107,400	413,700
Net income	$ 814,800	$ 853,600	$ 918,400
Earnings per share:
Basic (in dollars per share)	$ 4.84	$ 4.92	$ 5.06
Diluted (in dollars per share)	$ 4.80	$ 4.89	$ 5.01
Weighted average shares:
Basic (in shares)	168.5	173.5	181.3
Diluted (in shares)	169.9	174.5	183.2
Cash dividends declared and paid per share (in dollars per share)	$ 1.82	$ 1.58	$ 1.34

Consolidated Statement of Other Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 814.8	$ 853.6	$ 918.4
Other Comprehensive Income, Net of Tax
Fair value of investments		0.3	(0.1)
Pension adjustments	0.0	0.5	0.0
Foreign currency translation adjustment	0.0	0.0	(0.2)
Comprehensive income	$ 814.9	$ 854.4	$ 918.1

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 02, 2020	Sep. 27, 2019
Current assets:
Cash and cash equivalents	$ 566,700	$ 851,300
Marketable Securities, Current	408,100	203,300
Receivables, net of allowance for doubtful accounts of $0.8 and $0.6, respectively	393,600	465,300
Inventory	806,000	609,700
Other current assets	143,200	105,000
Total current assets	2,317,600	2,234,600
Property, plant and equipment, net	1,249,500	1,205,600
Operating Lease, Right-of-Use Asset	167,900	0
Goodwill	1,189,800	1,189,800
Intangible assets, net	53,500	107,900
Deferred tax assets, net	55,300	40,800
Marketable Securities, Noncurrent	5,200	27,600
Other assets	67,900	33,300
Total assets	5,106,700	4,839,600
Current liabilities:
Accounts payable	226,900	190,500
Accrued compensation and benefits	113,500	76,000
Other current liabilities	108,000	107,500
Total current liabilities	448,400	374,000
Long-term tax liabilities	311,300	312,400
Operating Lease, Liability, Noncurrent	150,700	0
Other long-term liabilities	32,100	30,900
Total liabilities	942,500	717,300
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; 230.2 shares issued and 170.1 shares outstanding at September 27, 2019, and 228.4 shares issued and 177.4 shares outstanding at September 28, 2018	41,400	42,500
Additional paid-in capital	3,403,700	3,188,000
Treasury stock, at cost	(4,093,500)	(3,412,900)
Retained earnings	4,820,400	4,312,600
Accumulated other comprehensive loss	(7,800)	(7,900)
Total stockholders' equity	4,164,200	4,122,300
Total liabilities and stockholders' equity	$ 5,106,700	$ 4,839,600

Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Millions, $ in Millions	Oct. 02, 2020	Sep. 27, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 0.6	$ 0.8
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	25.0	25.0
Preferred stock, shares issued (in shares)	0.0	0.0
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	525.0	525.0
Common stock, shares issued (in shares)	232.3	230.2
Common stock, shares outstanding (in shares)	165.6	170.1

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Cash flows from operating activities:
Net Income	$ 814,800	$ 853,600	$ 918,400
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	156,600	80,100	107,800
Depreciation	318,300	314,900	272,500
Amortization of intangible assets	46,000	56,700	26,700
Deferred income taxes	(13,400)	(6,100)	27,300
Asset Impairment Charges	11,800	0	0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0	(3,100)	(11,900)
Other	3,800	16,800	(700)
Changes in assets and liabilities net of acquired balances:
Receivables, net	71,700	190,500	(193,800)
Inventory	(190,400)	(119,600)	11,900
Accounts payable	61,100	(33,000)	(126,000)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(75,800)	16,600	228,400
Net Cash Provided by (Used in) Operating Activities	1,204,500	1,367,400	1,260,600
Cash flows from investing activities:
Capital expenditures	(389,400)	(398,400)	(422,300)
Payments for acquisitions, net of cash acquired	0	0	(404,000)
Purchased intangibles	(9,100)	(25,000)	(8,600)
Payments to Acquire Marketable Securities	(790,500)	(360,500)	(683,700)
Maturity of investments	607,600	447,000	368,200
Net Cash Provided by (Used in) Investing Activities	(581,400)	(336,900)	(1,150,400)
Cash flows from financing activities:
Repurchase of common stock - payroll tax withholdings on equity awards	(33,100)	(22,800)	(48,000)
Repurchase of common stock - share repurchase program	(647,500)	(657,600)	(759,500)
Dividends paid	(307,000)	(273,900)	(243,200)
Proceeds from Issuance of Common Stock	22,800	19,700	18,200
Net proceeds from exercise of stock options	57,100	22,100	38,800
Net Cash Provided by (Used in) Financing Activities	(907,700)	(912,500)	(993,700)
Net increase in cash and cash equivalents	(284,600)	118,000	(883,500)
Cash and cash equivalents at beginning of period	851,300	733,300	1,616,800
Cash and cash equivalents at end of period	566,700	851,300	733,300
Supplemental cash flow disclosures:
Income taxes paid	110,800	124,400	135,900
Capital Expenditures Incurred but Not yet Paid	$ 78,700	$ 101,500	$ 108,000

Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) Statement - USD ($) $ in Thousands, shares in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 29, 2017	$ 4,065,700	$ 45,800	$ (1,925,000)	$ 2,893,800	$ 3,059,600	$ (8,500)
Common stock, shares, outstanding beginning balance (in shares) at Sep. 29, 2017		183.1
Treasury stock, shares outstanding, beginning balance (in shares) at Sep. 29, 2017			42.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	918,400				918,400
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes (in shares)		2.0	0.4
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes	10,300	$ 500	$ (48,000)	57,800
Share-based Compensation expense	$ 105,400			107,300
Share repurchase program (in shares)	(7.7)	(7.7)
Share repurchase program	$ (759,500)	$ (1,900)	$ (759,500)	1,900
Stock Repurchased During Period, Shares			7.7
Dividends declared	(243,200)				(243,200)
Stock Issued During Period, Value of Share Based Compensation, Pre-combination service on replacement awards	200
Other comprehensive income (loss)	(300)					(300)
Common stock, shares, outstanding ending balance (in shares) at Sep. 28, 2018		177.4
Treasury stock, shares outstanding, ending balance (in shares) at Sep. 28, 2018			51.0
Ending balance at Sep. 28, 2018	4,097,000	$ 44,400	$ (2,732,500)	3,061,000	3,732,900	(8,800)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption					(1,900)
Net income	853,600				853,600
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes (in shares)		1.6	0.3
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes	19,800	$ 300	$ (22,800)	42,200
Share-based Compensation expense	$ 82,500			82,500
Share repurchase program (in shares)	(8.9)	(8.9)
Share repurchase program	$ (657,600)	$ (2,200)	$ (657,600)	2,200
Stock Repurchased During Period, Shares			8.9
Dividends declared	(273,900)				(273,900)
Other comprehensive income (loss)	$ 800					800
Common stock, shares, outstanding ending balance (in shares) at Sep. 27, 2019	170.1	170.1
Treasury stock, shares outstanding, ending balance (in shares) at Sep. 27, 2019			60.1
Ending balance at Sep. 27, 2019	$ 4,122,300	$ 42,500	$ (3,412,900)	3,188,000	4,312,600	(7,900)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	814,800
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes (in shares)		1.8	0.3
Exercise and settlement of share based awards and related tax benefit, net of shares withheld for taxes	46,800	$ 500	$ (33,100)	79,400
Share-based Compensation expense	$ 134,700			134,700
Share repurchase program (in shares)	(6.3)	(6.3)
Share repurchase program	$ (647,500)	$ (1,600)	$ (647,500)	1,600
Stock Repurchased During Period, Shares			6.3
Dividends declared	(307,000)				(307,000)
Other comprehensive income (loss)	$ 100					100
Common stock, shares, outstanding ending balance (in shares) at Oct. 02, 2020	165.6	165.6
Treasury stock, shares outstanding, ending balance (in shares) at Oct. 02, 2020			66.7
Ending balance at Oct. 02, 2020	$ 4,164,200	$ 41,400	$ (4,093,500)	$ 3,403,700	$ 4,820,400	$ (7,800)

Description Of Business And Basis Of Presentation	12 Months Ended
Description Of Business And Basis Of Presentation	Oct. 02, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	1. 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 semiconductors are connecting people, places, and things, spanning a number of new applications within the aerospace, automotive, broadband, cellular infrastructure, connected home, entertainment and gaming, industrial, medical, military, smartphone, tablet, and wearable markets.

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Oct. 02, 2020
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation All Skyworks subsidiaries are included in the Company’s consolidated financial statements and all intercompany balances are eliminated in consolidation. Certain items in the fiscal years 2019 and 2018 financial statements have been reclassified to conform to the fiscal 2020 presentation. Fiscal Year The Company’s fiscal year ends on the Friday closest to September 30. Fiscal 2020 consisted of 53 weeks and ended on October 2, 2020. Fiscal 2019 and 2018 each consisted of 52 weeks and ended on September 27, 2019 and September 28, 2018, respectively. Use of Estimates 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 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, 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. Cash and Cash Equivalents The Company invests excess cash in time deposits, certificate of deposits, money market funds, U.S. Treasury securities, agency securities, other government securities, corporate debt securities and commercial paper. The Company considers highly liquid investments as cash equivalents including money market funds and investments with maturities of 90 days or less when purchased. Investments The Company classifies its investment in marketable debt securities as “available-for-sale.” Available-for-sale securities are carried at fair value with unrealized holding gains or losses recorded in other comprehensive income, net of tax. Gains or losses are included in earnings in the period in which they are realized. The cost of securities sold is determined based on the specific identification method. The cost of available-for-sale debt securities is adjusted for premiums and discounts, with the amortization or accretion of such amounts included as a portion of interest. Available-for-sale debt securities with an original maturity date greater than three months and less than one year are classified as current investments. Available-for-sale debt securities with an original maturity date exceeding one year are classified as long-term. Fair Value Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principle or most advantageous market in an orderly transaction between market participants at the measurement date. Applicable accounting guidance provides a hierarchy for inputs used in measuring fair value that prioritize the use of observable inputs over the use of unobservable inputs, when such observable inputs are available. The three levels of inputs that may be used to measure fair value are as follows: •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. It is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. When available, the Company uses quoted market prices to measure fair value. If market prices are not available, the Company is required to make judgments about assumptions market participants would use to estimate the fair value of a financial instrument. The Company measures certain assets and liabilities at fair value on a recurring basis in three levels, based on the market in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. It recognizes transfers within the fair value hierarchy at the end of the fiscal quarter in which the change in circumstances that caused the transfer occurred. The carrying value of cash and cash equivalents, accounts receivable, other current assets, accounts payable and accrued liabilities approximates fair value due to the short-term maturities of these assets and liabilities. Inventory Inventory is stated at the lower of cost or net realizable value on a first-in, first-out basis. Reserves for excess and obsolete inventory are established on a quarterly basis and are based on a detailed analysis of aged material, salability of our inventory, market conditions, and product life cycles. Once reserves are established, write-downs of inventory are considered permanent adjustments to the cost basis of inventory. Property, Plant, and Equipment Property, plant, and equipment are carried at cost less accumulated depreciation, with significant renewals and betterments being capitalized and retired equipment written off in the respective periods. Maintenance and repairs are expensed as incurred. Depreciation is calculated using the straight-line method over the estimated useful lives, which range from five to thirty years for buildings and improvements and three to ten years for machinery and equipment. Leasehold improvements are depreciated over the lesser of the economic life or the life of the associated lease. Leases The Company determines if an arrangement is a lease at its inception. Right-of-use (“ROU”) assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The Company uses its estimated incremental borrowing rate in determining the present value of lease payments considering the term of the lease, which is derived from information available at the lease commencement date. The lease term includes renewal options when it is reasonably certain that the option will be exercised and excludes termination options. To the extent that the Company’s agreements have variable lease payments, the Company includes variable lease payments that depend on an index or a rate and excludes those that depend on facts or circumstances occurring after the commencement date, other than the passage of time. Lease expense for these leases is recognized on a straight-line basis over the lease term. The Company has elected not to recognize ROU assets and lease liabilities that arise from short-term (12 months or less) leases for any class of underlying asset. Operating leases are included in operating lease ROU assets, other current liabilities, and long-term operating lease liabilities in the Company's condensed consolidated balance sheet. Valuation of Long-Lived Assets Definite lived intangible assets are carried at cost less accumulated amortization. Amortization is calculated based on the pattern of benefit to be recognized from the underlying asset over its estimated useful life. Carrying values for long-lived assets and definite lived intangible assets are reviewed for possible impairment as circumstances warrant. Factors considered important that could result in an impairment review include significant underperformance relative to expected, historical or projected future operating results, significant changes in the manner of use of assets or the Company’s business strategy, or significant negative industry or economic trends. In addition, impairment reviews are conducted at the judgment of management whenever asset values are deemed to be unrecoverable relative to future undiscounted cash flows expected to be generated by that particular asset group. The determination of recoverability is based on an estimate of undiscounted cash flows expected to result from the use of an asset group and its eventual disposition. Such estimates require management to exercise judgment and make assumptions regarding factors such as future revenue streams, operating expenditures, cost allocation and asset utilization levels, all of which collectively impact future operating performance. The Company’s estimates of undiscounted cash flows may differ from actual cash flows due to, among other things, technological changes, economic conditions, changes to its business model or changes in its operating performance. If the sum of the undiscounted cash flows is less than the carrying value of an asset group, the Company would recognize an impairment loss, measured as the amount by which the carrying value exceeds the fair value of the asset group. Goodwill and Indefinite-Lived Intangible Assets Goodwill and indefinite-lived intangible assets are not amortized but are tested at least annually as of the first day of the fourth fiscal quarter for impairment or more frequently if indicators of impairment exist during the fiscal year. The Company assesses its conclusion regarding segments and reporting units in conjunction with its annual goodwill impairment test and has determined that it has one reporting unit for the purposes of allocating and testing goodwill. The Company’s impairment analysis compares its fair value to its net book value to determine if there is an indicator of impairment. In the Company’s calculation of fair value, it considers the closing price of its common stock on the selected testing date, the number of shares of its common stock outstanding and other marketplace activity such as a related control premium. If the calculated fair value is determined to be less than the book value of the reporting unit, an impairment loss is recognized equal to that excess; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Revenue Recognition The Company derives its revenue primarily from the sale of semiconductor products under individual customer purchase orders, some of which have underlying master sales agreements that specify terms governing the product sales. In the absence of a sales agreement, the Company’s standard terms and conditions apply. Revenue is recognized when control of the promised goods or services is transferred to the Company’s customers, in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The Company applies a five-step approach as defined in FASB ASC 606, Revenue from Contracts with Customers (Topic 606), in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when the corresponding performance obligation is satisfied. Each distinct promise to transfer products is considered to be an identified performance obligation for which revenue is recognized at a point in time upon transfer of control of the products to the customer. Transfer of control occurs upon shipment to the distributor or direct customer or when products are pulled from consignment inventory by the customer. Point in time recognition is determined as products manufactured under non-cancellable orders create an asset with an alternative use to the Company. Returns under the Company’s general assurance warranty of products have not been material, and warranty-related services are not considered a separate performance obligation. Pricing adjustments and estimates of returns are treated as variable consideration for purposes of determining the transaction price. Sales returns are generally accepted at the Company’s discretion or from distributors with stock rotation rights. Stock rotation allows distributors limited levels of returns and is based on the distributor’s prior purchases. Price protection represents price discounts granted to certain distributors and is based on negotiations on sales to end customers. Variable consideration is estimated using the expected value method considering all reasonably available information, including the Company’s historical experience and its current expectations, and is reflected in the transaction price when sales are recorded. The Company records net revenue excluding taxes collected on its sales to trade customers. Accounts receivable represents the Company’s unconditional right to receive consideration from its customer. Substantially all payments are collected within the Company’s standard terms, which do not include a significant financing component. To date, there have been no material impairment losses on accounts receivable. There were no material contract assets or contract liabilities recorded on the consolidated balance sheet in any of the periods presented. All incremental customer contract acquisition costs are expensed as they are incurred as the amortization period of the asset that the Company otherwise would have recognized is one year or less in duration. Share-Based Compensation The Company recognizes compensation expense for all share-based payment awards made to employees and directors including non-qualified employee stock options, share awards and units, employee stock purchase plan and other special share-based awards based on estimated fair values. The fair value of share-based payment awards is amortized over the requisite service period, which is defined as the period during which an employee is required to provide service in exchange for an award. The Company uses a straight-line attribution method for all grants that include only a service condition. Awards with both performance and service conditions are expensed over the service period for each separately vesting tranche. Share-based compensation expense recognized during the period includes actual expense on vested awards and expense associated with unvested awards. Forfeitures are recorded as incurred. The Company determines the fair value of share-based option awards based on the Company’s closing stock price on the date of grant using a Black-Scholes options pricing model. Under the Black-Scholes model, a number of variables are used including, but not limited to: the expected stock price volatility over the term of the award, the risk-free rate, the expected life of the award and dividend yield. The determination of fair value of restricted and certain performance stock awards and units is based on the value of the Company’s stock on the date of grant with performance awards and units adjusted for the actual outcome of the underlying performance condition. For more complex performance awards including units with market-based performance conditions the Company employs a Monte Carlo simulation valuation method to calculate the fair value of the awards based on the most likely outcome. Under the Monte Carlo simulation, a number of variables and assumptions are used including, but not limited to: the expected stock price volatility over the term of the award, a correlation coefficient, the risk-free rate, and dividend yield. Research and Development Costs Research and development costs are expensed as incurred. Loss Contingencies The Company records its best estimates of a loss contingency when it is considered probable and the amount can be reasonably estimated. When a range of loss can be reasonably estimated with no best estimate in the range, the minimum estimated liability related to the claim is recorded. As additional information becomes available, the Company assesses the potential liability related to the potential pending loss contingency and revises its estimates. Material loss contingencies are disclosed if there is at least a reasonable possibility that a loss or an additional loss may have been incurred and include estimated legal costs. Restructuring A liability for post-employment benefits is recorded when payment is probable and the amount is reasonably estimable. Contract exit costs include contract termination fees and future contractual commitments for lease payments. A liability for contract exit costs is recognized in the period in which the Company terminates the contract or on the cease-use date for leased facilities. Foreign Currencies The Company’s functional currency is the United States dollar. Gains and losses related to foreign currency transactions and conversion of foreign denominated cash balances are included in current results. Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. This method also requires the recognition of future tax benefits such as net operating loss carry forwards, to the extent that realization of such benefits is more likely than not. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The carrying value of the Company’s net deferred tax assets assumes the Company will be able to generate sufficient future taxable income in certain tax jurisdictions, based on estimates and assumptions. If these estimates and related assumptions change in the future, the Company may be required to record additional valuation allowances against its deferred tax assets resulting in additional income tax expense in its Consolidated Statement of Operations. Management evaluates the realizability of the deferred tax assets and assesses the adequacy of the valuation allowance quarterly. Likewise, in the event the Company were to determine that it would be able to realize its deferred tax assets in the future in excess of their net recorded amount, an adjustment to the deferred tax assets would increase income in the period such determination was made. The determination of recording or releasing tax valuation allowances is made, in part, pursuant to an assessment performed by management regarding the likelihood that the Company will generate future taxable income against which benefits of its deferred tax assets may or may not be realized. This assessment requires management to exercise judgment and make estimates with respect to its ability to generate revenues, gross profits, operating income, and taxable income in future periods. Amongst other factors, management must make assumptions regarding overall business and semiconductor industry conditions, operating efficiencies, the Company’s ability to develop products to its customers’ specifications, technological change, the competitive environment, and changes in regulatory requirements which may impact its ability to generate taxable income and, in turn, realize the value of its deferred tax assets. The calculation of the Company’s tax liabilities includes addressing uncertainties in the application of complex tax regulations and is based on the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company recognizes liabilities for anticipated tax audit issues in the United States and other tax jurisdictions based on its recognition threshold and measurement attribute of whether it is more likely than not that the positions the Company has taken in tax filings will be sustained upon tax audit, and the extent to which, additional taxes would be due. If payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period in which it is determined the liabilities are no longer necessary. If the estimate of tax liabilities proves to be less than the ultimate assessment, a further charge to expense would result. The Company recognizes any interest or penalties, if incurred, on any unrecognized tax liabilities or benefits as a component of income tax expense. Earnings Per Share Basic earnings per share are computed using the weighted average number of common shares outstanding during the period. Diluted earnings per share incorporate the potentially dilutive incremental shares issuable upon the assumed exercise of stock options, the assumed vesting of outstanding restricted stock units, and the assumed issuance of common stock under the stock purchase plan using the treasury share 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. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) (“ASU 2016-02”). This ASU requires lessees to reflect leases with a term greater than one year on their balance sheet as assets and obligations. The Company adopted the standard in the first quarter of fiscal 2020, using the modified retrospective approach, whereby the Company was not required to adjust comparative period financial statements for the new standard. Upon adoption, the Company recorded an ROU asset of $141.4 million and a lease liability of $143.1 million. This standard did not have a material impact on the Consolidated Statement of Operations or Consolidated Statement of Cash Flows. Upon adoption, the Company elected the package of three practical expedients that permits the Company to maintain its historical conclusions about lease identification, lease classification and initial direct costs for leases that exist at the date of adoption. Further, the Company elected the practical expedient to not separate lease and non-lease components.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) (“ASU 2016-02”). This ASU requires lessees to reflect leases with a term greater than one year on their balance sheet as assets and obligations. The Company adopted the standard in the first quarter of fiscal 2020, using the modified retrospective approach, whereby the Company was not required to adjust comparative period financial statements for the new standard. Upon adoption, the Company recorded an ROU asset of $141.4 million and a lease liability of $143.1 million. This standard did not have a material impact on the Consolidated Statement of Operations or Consolidated Statement of Cash Flows. Upon adoption, the Company elected the package of three practical expedients that permits the Company to maintain its historical conclusions about lease identification, lease classification and initial direct costs for leases that exist at the date of adoption. Further, the Company elected the practical expedient to not separate lease and non-lease components.

Fair Value

12 Months Ended

Oct. 02, 2020

Fair Value Disclosures [Abstract]

FAIR VALUE

4. FAIR VALUE

Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis

The Company measures certain assets and liabilities at fair value on a recurring basis such as its financial instruments. There have been no transfers between Level 1, 2 or 3 assets or liabilities during the fiscal year ended October 2, 2020.

Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):


	As of October 2, 2020								As of September 27, 2019
			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*	$	566.7	$	561.2	$	5.5	$	—	$	851.3	$	809.5	$	41.8	$	—
U.S. Treasury and government securities	134.4		43.2		91.2		—		54.2		28.4		25.8		—
Corporate bonds and notes	276.8		—		276.8		—		72.1		—		72.1		—
Municipal bonds	2.1		—		2.1		—		104.6		—		104.6		—
Total	$	980.0	$	604.4	$	375.6	$	—	$	1,082.2	$	837.9	$	244.3	$	—

* 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 fiscal 2020, the Company abandoned a previously capitalized IPR&D project and recorded an impairment charge of $9.8 million.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Inventory

12 Months Ended

Oct. 02, 2020

Inventory, Net [Abstract]

INVENTORY

5. INVENTORY

Inventory consists of the following (in millions):


	As of
	October 2, 2020		September 27, 2019
Raw materials	$	37.8	$	24.4
Work-in-process	566.4		336.2
Finished goods	198.9		245.7
Finished goods held on consignment by customers	2.9		3.4
Total inventory	$	806.0	$	609.7

Property, Plant And Equipment

12 Months Ended

Oct. 02, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

6. PROPERTY, PLANT, AND EQUIPMENT, NET

Property, plant, and equipment, net consists of the following (in millions):


	As of
	October 2, 2020		September 27, 2019
Land and improvements	$	11.8	$	11.7
Buildings and improvements	424.8		354.4
Furniture and fixtures	46.5		33.8
Machinery and equipment	2,556.1		2,311.5
Construction in progress	140.7		172.5
Total property, plant, and equipment, gross	3,179.9		2,883.9
Accumulated depreciation	(1,930.4)		(1,678.3)
Total property, plant, and equipment, net	$	1,249.5	$	1,205.6

Marketable Securities (Notes)

12 Months Ended

Oct. 02, 2020

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure

3. MARKETABLE SECURITIES

The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):


	Current				Noncurrent
Available-for-sale:	October 2, 2020		September 27, 2019		October 2, 2020		September 27, 2019
U.S. Treasury and government	$	129.4	$	34.2	$	5.0	$	20.0
Corporate bonds and notes	276.8		66.2		—		5.9
Municipal bonds	1.9		102.9		0.2		1.7
Total	$	408.1	$	203.3	$	5.2	$	27.6

The contractual maturities of noncurrent available-for-sale marketable securities were due within two years or less. There were gross unrealized gains of $0.3 million on U.S. Treasury securities and $0.2 million on corporate bonds and notes as of October 2, 2020, and $0.1 million in gross unrealized losses on municipal bonds as of September 27, 2019.

Goodwill and Intangible Assets

12 Months Ended

Oct. 02, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

7. GOODWILL AND INTANGIBLE ASSETS

The Company’s goodwill balance was $1,189.8 million as of October 2, 2020, and September 27, 2019. The Company performed an impairment test of its goodwill as of the first day of the fourth fiscal quarter in accordance with its regularly scheduled testing. The results of this test indicated that the Company’s goodwill was not impaired. There were no other indicators of impairment noted during the fiscal year ended October 2, 2020.

Intangible assets consist of the following (in millions):


		As of						As of
	Weighted average amortization period (years)	October 2, 2020						September 27, 2019
		Gross carrying amount		Accumulated amortization		Net carrying amount		Gross carrying amount		Accumulated amortization		Net carrying amount
Customer relationships	5.0	$	18.2	$	(15.8)	$	2.4	$	25.6	$	(19.5)	$	6.1
Developed technology and other	3.8	101.0		(81.6)		19.4		94.4		(48.9)		45.5
Trademarks	3.0	1.6		(1.5)		0.1		1.6		(1.3)		0.3
Technology licenses	3.0	26.3		(14.2)		12.1		$	24.9	(4.8)		20.1
IPR&D		19.5		—		19.5		$	35.9	—		35.9
Total intangible assets		$	166.6	$	(113.1)	$	53.5	$	182.4	$	(74.5)	$	107.9

Fully amortized intangible assets are eliminated from both the gross and accumulated amortization amounts in the first quarter of each fiscal year. Accrued technology licenses payable of $11.5 million and $20.1 million have been included in other current liabilities within the consolidated balance sheets as of October 2, 2020, and September 27, 2019, 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):


	2021		2022		2023		2024		2025		Thereafter
Amortization expense, cost of goods sold	$	6.0	$	0.1	$	0.1	$	0.1	$	0.1	$	1.7
Amortization expense, operating expense	$	17.0	$	5.0	$	1.0	$	1.0	$	1.0	$	0.9
Total amortization expense	$	23.0	$	5.1	$	1.1	$	1.1	$	1.1	$	2.6

Income Taxes

12 Months Ended

Oct. 02, 2020

Income Tax Disclosure [Abstract]

INCOME TAXES

8. INCOME TAXES

Income before income taxes consists of the following components (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
United States	$	435.9	$	427.2	$	712.2
Foreign	455.8		533.8		619.9
Income before income taxes	$	891.7	$	961.0	$	1,332.1

The provision for income taxes consists of the following components(in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Current tax expense (benefit):
Federal	$	44.4	$	85.3	$	347.7
State	—		(0.1)		0.3
Foreign	49.5		23.5		31.2
	93.9		108.7		379.2
Deferred tax expense (benefit):
Federal	(6.8)		(0.4)		20.3
Foreign	(10.2)		(0.9)		14.2
	(17.0)		(1.3)		34.5

Provision for income taxes	$	76.9	$	107.4	$	413.7

The actual income tax expense is different than that which would have been computed by applying the federal statutory tax rate to income before income taxes. A reconciliation of income tax expense as computed at the United States federal statutory income tax rate to the provision for income tax expense is as follows (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Tax expense at United States statutory rate	$	187.3	$	201.8	$	327.4
Foreign tax rate difference	(86.6)		(115.3)		(111.9)
Tax on deemed repatriation	0.2		8.1		224.6
Effect of stock compensation	(10.3)		(1.6)		(25.6)
Change of tax rate on deferred taxes	—		—		18.3
Research and development credits	(23.0)		(25.7)		(19.9)
Change in tax reserve	10.1		14.0		6.7
Domestic production activities deduction	—		—		(13.9)
Global Intangible Low-Taxed Income	35.9		54.3		—
Foreign Derived Intangible Income	(41.2)		(41.5)		—
Settlements with Tax Authorities	(0.5)		4.3		—
Other, net	5.0		9.0		8.0
Provision for income taxes	$	76.9	$	107.4	$	413.7

The Company operates in foreign jurisdictions with income tax rates lower than the United States tax rate of 21.0% for the fiscal years ended October 2, 2020, and September 27, 2019. The Company’s tax benefits related to foreign earnings taxed at a rate less than the United States federal rate were $86.6 million and $115.3 million for the fiscal years ended October 2, 2020, and September 27, 2019, respectively.

The Tax Reform Act includes, among other things, a reduction of the United States corporate tax rate from 35.0% to 21.0%, a mandatory deemed repatriation tax on foreign earnings, repeal of the corporate alternative minimum tax and the domestic production activities deduction, and expensing of certain capital investments. The law makes fundamental changes to the

taxation of multinational entities, including a shift from worldwide taxation with deferral to a hybrid territorial system, featuring a participation exemption regime, a minimum tax on low-taxed foreign earnings, and new measures to deter base erosion and promote export from the United States. As a result of this legislation, during fiscal 2018 the Company recognized a one-time transition tax related to the deemed repatriation of foreign earnings of $224.6 million and a charge related to the revaluation of its deferred tax assets at the new corporate tax rate of $18.3 million. During fiscal 2020 and fiscal 2019, the Company recorded discrete income tax expense adjustments of $0.2 million and $8.1 million, respectively, to the prior year provisional estimates. The Company had accrued $18.6 million and $177.0 million of the deemed repatriation tax in short-term and long-term liabilities within the consolidated balance sheet, respectively, as of October 2, 2020. The Company had accrued $18.8 million and $195.9 million of the deemed repatriation tax in short-term and long-term liabilities within the consolidated balance sheet, respectively, as of September 27, 2019.

In addition to the introduction of a modified territorial tax system, the Tax Reform Act includes new sets of provisions aimed at preventing or decreasing U.S. tax base erosion: the GILTI provisions, the base erosion and anti-abuse tax (“BEAT”) provisions, and the FDII provisions. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The Company has made an accounting policy election to account for taxes due on GILTI inclusions as a component of current-period tax expense. The BEAT provisions eliminate the deduction of certain base-erosion payments made to related foreign corporations and impose a minimum tax if greater than regular tax. The FDII provisions allow a U.S. corporation an immediate deduction for a portion of its FDII. The amount of the deduction will depend in part on the Company’s U.S. taxable income. The GILTI and FDII provisions became effective for the Company in fiscal 2019 and resulted in a $54.3 million tax expense and a $41.5 million tax benefit, respectively. In fiscal 2020, the GILTI and FDII provisions resulted in $35.9 million tax expense and $41.2 million tax benefit, respectively. The Company has analyzed the BEAT provisions for fiscal 2020, 2019, and 2018, and has determined that it is not subject to the minimum tax imposed by the BEAT provisions.

The Company’s federal income tax returns for fiscal 2015, fiscal 2016, fiscal 2018, and fiscal 2019 are currently under IRS examination. During the year ended September 27, 2019, the Company effectively settled a portion of this IRS examination. As a result, the Company accrued a tax payable of $3.8 million, including interest.

On October 2, 2010, the Company expanded its presence in Asia by launching operations in Singapore. The Company operates under a tax holiday in Singapore, which is effective through September 30, 2030. The current tax holiday is conditioned upon the Company’s compliance with certain employment and investment thresholds in Singapore. The impact of the tax holiday decreased Singapore’s taxes by $63.1 million, $32.8 million, and $38.4 million for the fiscal years ended October 2, 2020, September 27, 2019, and September 28, 2018, respectively, which resulted in tax benefits of $0.37, $0.19, and $0.21 of diluted earnings per share, respectively.

Deferred income tax assets and liabilities consist of the tax effects of temporary differences related to the following (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019
Deferred tax assets:
Inventory	$	12.1	$	10.1
Bad debts	0.1		0.2
Accrued compensation and benefits	10.1		5.9
Product returns, allowances, and warranty	0.4		0.3
Restructuring	—		0.6
Share-based and other deferred compensation	25.9		21.2
Net operating loss carry forwards	7.4		11.3
Non-United States tax credits	16.5		20.7
State tax credits	115.5		106.4
Leases	43.4		—
Property, plant, and equipment	24.3		17.7
Other, net	5.8		5.9
Deferred tax assets	261.5		200.3
Less valuation allowance	(137.4)		(129.1)
Net deferred tax assets	124.1		71.2
Deferred tax liabilities:
Prepaid insurance	(0.9)		(0.5)
Property, plant, and equipment	(26.4)		(19.3)
Intangible assets	(7.6)		(17.4)
Leases	(41.5)		—
Other, net	(6.6)		(6.3)
Net deferred tax liabilities	(83.0)		(43.5)
Total net deferred tax assets	$	41.1	$	27.7

In accordance with GAAP, management has determined that it is more likely than not that a portion of the Company's historic and current year income tax benefits will not be realized. As of October 2, 2020, the Company has a valuation allowance of $137.4 million. This valuation allowance is comprised of $118.8 million related to United States state tax credits and $18.6 million related to foreign deferred tax assets. The Company does not anticipate sufficient taxable income or tax liability to utilize these state and foreign credits. If these benefits are recognized in a future period, the valuation allowance on deferred tax assets will be reversed and up to a $137.4 million income tax benefit may be recognized. The Company will need to generate $124.1 million of future United States federal taxable income to utilize its United States deferred tax assets as of October 2, 2020. The Company believes that future reversals of taxable temporary differences, and its forecast of continued earnings in its domestic and foreign jurisdictions, support its decision to not record a valuation allowance on other deferred tax assets. The Company will continue to assess its valuation allowance in future periods. The net valuation allowance increased by $8.3 million and $10.5 million in fiscal 2020 and fiscal 2019, respectively, primarily related to increases for foreign and state net operating loss and tax credit carryovers.

As of October 2, 2020, the Company has United States federal net operating loss carry forwards of approximately $8.1 million. The utilization of these net operating losses is subject to certain annual limitations as required under Internal Revenue Code section 382 and similar state income tax provisions. The United States federal net operating loss carry forwards expire at various dates through 2035. The Company also has state income tax credit carry forwards of $115.4 million, net of federal benefits, for which the Company has provided a valuation allowance. The state tax credits relate primarily to California research tax credits that can be carried forward indefinitely.

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in millions):


	Unrecognized tax benefits
Balance at September 27, 2019	$	103.3
Increases based on positions related to prior years	2.8
Decreases based on positions related to prior years	(3.9)
Increases based on positions related to current year	15.5
Decreases relating to settlements with taxing authorities	—
Decreases relating to lapses of applicable statutes of limitations	(0.1)
Balance at October 2, 2020	$	117.6

Of the total unrecognized tax benefits at October 2, 2020, $95.3 million would impact the effective tax rate, if recognized. The remaining unrecognized tax benefits would not impact the effective tax rate, if recognized, due to the Company’s valuation allowance and certain positions that were required to be capitalized.

The Company anticipates reversals within the next 12 months related to items such as the lapse of the statute of limitations, audit closures, and other items that occur in the normal course of business. Due to open examinations, an estimate of anticipated reversals within the next 12 months cannot be made. During the fiscal years 2020, 2019, and 2018, the Company recognized $4.6 million, $6.0 million, and $4.1 million, respectively, of interest or penalties related to unrecognized tax benefits. Accrued interest and penalties of $16.1 million and $12.7 million related to uncertain tax positions have been included in long-term tax liabilities within the consolidated balance sheet as of October 2, 2020, and September 27, 2019, respectively.

The Company’s major tax jurisdictions as of October 2, 2020, are the United States, California, Canada, Mexico, Japan, and Singapore. For the United States, the Company has open tax years dating back to fiscal 2001 due to the carry forward of tax attributes. For California, the Company has open tax years dating back to fiscal 1999 due to the carry forward of tax attributes. For Canada, the Company has open tax years dating back to fiscal 2013. For Mexico, the Company has open tax years back to fiscal 2014. For Japan, the Company has open tax years back to fiscal 2014. For Singapore, the Company has open tax years dating back to fiscal 2014. The Company is subject to audit examinations by the respective taxing authorities on a periodic basis, of which the results could impact its financial position, results of operations or cash flows.

Stockholders' Equity

12 Months Ended

Oct. 02, 2020

Stockholders' Equity Note [Abstract]

STOCKHOLDERS’ EQUITY

9. STOCKHOLDERS’ EQUITY

Common Stock

At October 2, 2020, the Company is authorized to issue 525.0 million shares of common stock, par value $0.25 per share, of which 232.3 million shares are issued and 165.6 million shares are outstanding.

Holders of the Company’s common stock are entitled to dividends in the event declared by the Company’s Board of Directors out of funds legally available for such purpose. Dividends may not be paid on common stock unless all accrued dividends on preferred stock, if any, have been paid or declared and set aside. In the event of the Company’s liquidation, dissolution or winding up, the holders of common stock will be entitled to share pro rata in the assets remaining after payment to creditors and after payment of the liquidation preference plus any unpaid dividends to holders of any outstanding preferred stock.

Each holder of the Company’s common stock is entitled to one vote for each such share outstanding in the holder’s name. No holder of common stock is entitled to cumulate votes in voting for directors. The Company’s restated certificate of incorporation as amended to date (the “Certificate of Incorporation”) provides that, unless otherwise determined by the Company’s Board of Directors, no holder of stock has any preemptive right to purchase or subscribe for any stock of any class which the Company may issue or sell.

Preferred Stock

The Company’s Certificate of Incorporation has authorized and permits the Company to issue up to 25.0 million shares of preferred stock without par value in one or more series and with rights and preferences that may be fixed or designated by the Company’s Board of Directors without any further action by the Company’s stockholders. The designation, powers, preferences, rights and qualifications, limitations, and restrictions of the preferred stock of each series will be fixed by the certificate of designation relating to such series, which will specify the terms of the preferred stock. At October 2, 2020, the Company had no shares of preferred stock issued or outstanding.

Stock Repurchase

On January 30, 2019, the Board of Directors approved a 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 prior to January 30, 2021, on the open market or in privately negotiated transactions as permitted by securities laws and other legal requirements. This authorized stock repurchase program replaced in its entirety the January 31, 2018, stock repurchase program. The timing and amount of any shares of the Company’s common stock that are repurchased under the repurchase program are determined by the Company’s management based on its evaluation of market conditions and other factors.

During the fiscal year ended October 2, 2020, the Company paid approximately $647.5 million (including commissions) in connection with the repurchase of 6.3 million shares of its common stock (paying an average price of $102.74 per share) under the January 30, 2019, stock repurchase plan. As of October 2, 2020, $978.8 million remained available under the January 30, 2019, stock repurchase plan.

During the fiscal year ended September 27, 2019, the Company paid approximately $657.6 million (including commissions) in connection with the repurchase of 8.9 million shares of its common stock (paying an average price of $74.26 per share). During the fiscal year ended September 28, 2018, the Company paid approximately $759.5 million (including commissions) in connection with the repurchase of 7.7 million shares of its common stock (paying an average price of $98.84 per share).

Dividends

On November 2, 2020, the Company announced that the Board of Directors had declared a cash dividend on the Company’s common stock of $0.50 per share. This dividend is payable on December 10, 2020, to the Company’s stockholders of record as of the close of business on November 19, 2020. Future dividends are subject to declaration by the Board of Directors. The dividends charged to retained earnings in fiscal 2020 and 2019 were as follows (in millions except per share data):


	Fiscal Years Ended
	October 2, 2020				September 27, 2019
	Per Share		Total		Per Share		Total
First quarter	$	0.44	$	75.1	$	0.38	$	67.1
Second quarter	0.44		74.9		0.38		66.0
Third quarter	0.44		73.5		0.38		65.7
Fourth quarter	0.50		83.5		0.44		75.1
	$	1.82	$	307.0	$	1.58	$	273.9

Employee Stock Benefit Plans

As of October 2, 2020, the Company has the following equity compensation plans under which its equity securities were authorized for issuance to its employees and/or directors:

◦the 2002 Employee Stock Purchase Plan

◦the Non-Qualified Employee Stock Purchase Plan

◦the 2005 Long-Term Incentive Plan

◦the 2008 Director Long-Term Incentive Plan

◦the 2015 Long-Term Incentive Plan

Except for the Non-Qualified Employee Stock Purchase Plan, each of the foregoing equity compensation plans was approved by the Company’s stockholders.

As of October 2, 2020, a total of 65.2 million shares are authorized for grant under the Company’s share-based compensation plans, with 0.4 million options outstanding. The number of common shares reserved for future awards to employees and directors under these plans was 11.0 million at October 2, 2020. The Company currently grants new equity awards to employees under the 2015 Long-Term Incentive Plan and to non-employee directors under the 2008 Director Long-Term Incentive Plan.

2015 Long-Term Incentive Plan. Under this plan, officers, employees, and certain consultants may be granted stock options, restricted stock awards and units, performance stock awards and units and other share-based awards. The plan has been approved by the stockholders. Under the plan, up to 19.4 million shares have been authorized for grant. A total of 10.4 million shares are available for new grants as of October 2, 2020. The maximum contractual term of options under the plan is seven years from the date of grant. Options granted under the plan at the determination of the compensation committee generally vest ratably over four years. Restricted stock awards and units granted under the plan at the determination of the compensation committee generally vest over three or more years. With respect to restricted stock awards, dividends are accumulated from the grant date and paid when the underlying shares vest. If the underlying shares are forfeited for any reason, the rights to the dividends with respect to such shares are forfeited. No dividends or dividend equivalents are accumulated or paid with respect to restricted stock unit awards or other awards until the shares underlying such awards vest and are issued to the award holder. Performance stock awards and units are contingently granted depending on the achievement of certain predetermined performance goals and generally vest over two or more years.

2008 Director Long-Term Incentive Plan. Under this plan, non-employee directors may be granted stock options, restricted stock awards, and other share-based awards. The plan has been approved by the stockholders. Under the plan a total of 1.5 million shares have been authorized for grant. A total of 0.6 million shares are available for new grants as of October 2, 2020. The maximum contractual term of options granted under the plan is ten years from the date of grant. Options granted under the plan are generally exercisable over four years. Restricted stock awards and units granted under the plan generally vest over one or more years. With respect to restricted stock awards, dividends are accumulated from the grant date and paid when the underlying shares vest. If the underlying shares are forfeited for any reason, the rights to the dividends with respect to such shares are forfeited.

Employee Stock Purchase Plans. The Company maintains a domestic and an international employee stock purchase plan. Under these plans, eligible employees may purchase common stock through payroll deductions of up to 10% of their compensation. The price per share is the lower of 85% of the fair market value of the common stock at the beginning or end of each offering period (six months). The plans provide for purchases by employees of up to an aggregate of 11.6 million shares. Shares of common stock purchased under these plans in the fiscal years ended October 2, 2020, September 27, 2019, and September 28, 2018, were 0.3 million, 0.3 million, and 0.2 million, respectively. At October 2, 2020, there are 1.8 million shares available for purchase. The Company recognized compensation expense of $6.6 million, $5.8 million, and $5.2 million for the fiscal years ended October 2, 2020, September 27, 2019, and September 28, 2018, respectively, related to the employee stock purchase plan. The unrecognized compensation expense on the employee stock purchase plan at October 2, 2020, was $3.1 million. The weighted average period over which the cost is expected to be recognized is approximately four months.

Stock Options

The following table represents a summary of the Company’s stock options:


	Shares (in millions)	Weighted average exercise price		Weighted average remaining contractual life (in years)	Aggregate intrinsic value (in millions)
Balance outstanding at September 27, 2019	1.3	$	65.38
Granted	—	$	98.72
Exercised	(0.9)	$	63.69
Canceled/forfeited	—	$	50.23
Balance outstanding at October 2, 2020	0.4	$	70.28	2.2	$	27.8

Exercisable at October 2, 2020	0.3	$	70.10	1.9	$	24.6

The weighted-average grant date fair value per share of employee stock options granted during the fiscal years ended October 2, 2020, September 27, 2019, and September 28, 2018, was $24.49, $21.74, and $68.32, respectively.

Restricted and Performance Awards and Units

The following table represents a summary of the Company’s restricted and performance awards and units:


	Shares (in millions)	Weighted average grant date fair value
Non-vested awards outstanding at September 27, 2019	2.9	$	89.14
Granted (1)	1.4	$	99.68
Vested	(1.0)	$	85.35
Canceled/forfeited	(0.4)	$	93.44
Non-vested awards outstanding at October 2, 2020	2.9	$	94.77
(1) includes performance stock awards granted and earned assuming target performance under the underlying performance metrics

The weighted average grant date fair value per share for awards granted during the fiscal years ended October 2, 2020, September 27, 2019, and September 28, 2018, was $99.68, $78.41, and $108.86, respectively.

The following table summarizes the total intrinsic value for stock options exercised and awards vested (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Awards	$	100.9	$	67.7	$	134.4
Options	$	44.2	$	26.4	$	75.0

Valuation and Expense Information

The following table summarizes pre-tax share-based compensation expense by financial statement line and related tax benefit (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Cost of goods sold	$	23.2	$	13.0	$	14.4
Research and development	68.7		41.6		42.6
Selling, general and administrative	64.7		25.5		50.8
Total share-based compensation expense	$	156.6	$	80.1	$	107.8

Share-based compensation tax benefit	$	10.3	$	1.6	$	25.6
Capitalized share-based compensation expense at period end	$	10.6	$	4.7	$	2.9

The following table summarizes total compensation costs related to unvested share-based awards not yet recognized and the weighted average period over which it is expected to be recognized at October 2, 2020:


	Unrecognized compensation cost for unvested awards (in millions)		Weighted average remaining recognition period (in years)
Awards	$	170.7	1.6
Options	$	0.3	0.5

The fair value of the restricted stock awards and units is equal to the closing market price of the Company’s common stock on the date of grant.

The Company issued performance stock unit awards during fiscal 2020, fiscal 2019, and fiscal 2018 that contained market-based conditions. The fair value of these performance stock unit awards was estimated on the date of the grant using a Monte Carlo simulation with the following weighted average assumptions:


	Fiscal Year Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Volatility of common stock	32.22	%	32.65	%	35.54	%
Average volatility of peer companies	33.96	%	37.07	%	36.78	%
Average correlation coefficient of peer companies	0.61		0.47		0.47
Risk-free interest rate	1.62	%	2.98	%	1.74	%
Dividend yield	1.78	%	1.84	%	1.15	%

The fair value of each stock option is estimated on the date of the grant using the Black-Scholes option pricing model with the following weighted average assumptions:


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Expected volatility	34.26	%	34.47	%	35.86	%
Risk-free interest rate	1.65	%	2.76	%	2.00	%
Dividend yield	1.78	%	1.84	%	1.15	%
Expected option life (in years)	4.0		4.0		4.0

The Company used a historical volatility calculated by the mean reversion of the weekly-adjusted closing stock price over the expected life of the options. The risk-free interest rate assumption is based upon observed treasury bill interest rates appropriate for the expected life of the Company’s employee stock options. The dividend yield was calculated based on the annualized dividend and the stock price on the date of grant.

The expected life of employee stock options represents a calculation based upon the historical exercise, cancellation, and forfeiture experience for the Company across its demographic population. The Company believes that this historical data is the best estimate of the expected life of a new option and that generally all groups of the Company’s employees exhibit similar behavior.

Leases, Codification Topic 842

12 Months Ended

Oct. 02, 2020

Leases [Abstract]

Lessee, Operating Leases

10. LEASES

The Company’s lease arrangements consist primarily of corporate, manufacturing, and other facility agreements as well as various machinery and office equipment agreements. The leases expire at various dates through 2033, some of which include options to extend the lease term. The options with the longest potential total lease term consist of options for extension of up to three five-year periods following expiration of the original lease term.

During the fiscal year ended October 2, 2020, the Company recorded $28.1 million of operating lease expense and $7.6 million of variable lease expense. During the fiscal years ended September 27, 2019, and September 28, 2018, the Company recorded $18.7 million and $20.5 million of rent expense, respectively. The Company’s finance leases and short-term leases are immaterial.

Supplemental cash information and non-cash activities related to operating leases are as follows (in millions):


	Fiscal Year Ended
	October 2, 2020
Operating cash outflows from operating leases	$	25.4
Operating lease assets obtained in exchange for new lease liabilities	$	31.0

Maturities of lease liabilities under operating leases by fiscal year are as follows (in millions):


	As of
	October 2, 2020
2021	$	25.7
2022	28.7
2023	25.1
2024	21.7
2025	20.6
Thereafter	81.6
Total lease payments	203.4
Less: imputed interest	(24.5)
Present value of lease liabilities	178.9
Less: current portion (included in other current liabilities)	(28.2)
Total	$	150.7

Future minimum lease liabilities under non-cancelable operating leases are as follows (in millions):


	As of
	September 27, 2019
2020	$	26.7
2021	25.9
2022	24.8
2023	23.3
2024	21.5
Thereafter	97.7
Total	$	219.9

Weighted-average remaining lease term and discount rate related to operating leases are as follows:


	As of
	October 2, 2020
Weighted-average remaining lease term (years)	8.2
Weighted-average discount rate	3.3	%

Commitments	12 Months Ended
Commitments	Oct. 02, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS	11. 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/or 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	12 Months Ended
Guarantees and Indemnities	Oct. 02, 2020
Guarantees [Abstract]
GUARANTEES AND INDEMNITIES	12. 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.

Earnings Per Share

12 Months Ended

Oct. 02, 2020

Earnings Per Share [Abstract]

EARNINGS PER SHARE

13. EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share amounts):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Net income	$	814.8	$	853.6	$	918.4

Weighted average shares outstanding – basic	168.5		173.5		181.3
Dilutive effect of equity-based awards	1.4		1.0		1.9
Weighted average shares outstanding – diluted	169.9		174.5		183.2

Net income per share – basic	$	4.84	$	4.92	$	5.06
Net income per share – diluted	$	4.80	$	4.89	$	5.01

Anti-dilutive common stock equivalents	0.1		1.4		0.2

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 fiscal years ended October 2, 2020, September 27, 2019, and September 28, 2018, 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. 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.

Segment Information

12 Months Ended

Oct. 02, 2020

Segment Reporting [Abstract]

SEGMENT INFORMATION AND CONCENTRATIONS

14. SEGMENT INFORMATION AND CONCENTRATIONS

The Company has a single reportable operating segment which designs, develops, manufactures, and markets similar proprietary semiconductor products, including intellectual property. In reaching this conclusion, management considers the definition of the chief operating decision maker (“CODM”), how the business is defined by the CODM, the nature of the information provided to the CODM and how that information is used to make operating decisions, allocate resources, and assess performance. The Company’s CODM is the president and chief executive officer. The results of operations provided to and analyzed by the CODM are at the consolidated level and accordingly, key resource decisions and assessment of performance are performed at the consolidated level. The Company assesses its determination of operating segments at least annually.

Geographic Information

The Company presents net revenue by geographic area based upon the location of the OEMs’ headquarters 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. Net revenue by geographic area is as follows (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
United States	$	2,012.8	$	1,860.4	$	1,946.2
China	700.7		718.7		982.8
South Korea	254.6		365.5		432.7
Taiwan	240.4		271.1		339.1
Europe, Middle East, and Africa	122.9		134.9		144.6
Other Asia-Pacific	24.3		26.2		22.6
Total	$	3,355.7	$	3,376.8	$	3,868.0

The Company’s revenue from external customers is generated principally from the sale of semiconductor products that facilitate various wireless communication applications. Accordingly, the Company considers its product offerings to be similar in nature and therefore not segregated for reporting purposes. Accrued customer liabilities of $20.3 million and $38.5 million have been included in other current liabilities within the consolidated balance sheets as of October 2, 2020 and September 27, 2019, respectively.

Net property, plant, and equipment balances, based on the physical locations within the indicated geographic areas are as follows (in millions):


	As of
	October 2, 2020		September 27, 2019
Japan	$	507.0	$	491.9
Mexico	364.9		351.5
Singapore	237.4		229.9
United States	124.8		117.6
Rest of world	15.4		14.7
	$	1,249.5	$	1,205.6

Concentrations

Financial instruments that potentially subject the Company to concentration of credit risk consist principally of trade accounts receivable. Trade accounts receivable are primarily derived from sales to manufacturers of communications and consumer products and electronic component distributors. The Company performs ongoing credit evaluations of customers.

In fiscal 2020, 2019, and 2018, Apple, through sales to multiple distributors, contract manufacturers and direct sales for multiple applications including smartphones, tablets, desktop, and notebook computers, watches and other devices, in the aggregate accounted for 56%, 51%, and 47% of the Company’s net revenue, respectively.

At October 2, 2020, the Company’s three largest accounts receivable balances comprised 70% of aggregate gross accounts receivable. This concentration was 67% and 66% at September 27, 2019, and September 28, 2018, respectively.

Quarterly Financial Data (Unaudted)	12 Months Ended
Quarterly Financial Data (Unaudted)	Oct. 02, 2020
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL DATA (UNAUDITED)	(1) Earnings per share calculations for each of the quarters are based on the weighted average number of shares outstanding and included common stock equivalents in each period. Therefore, the sums of the quarters do not necessarily equal the full year earnings per share.

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Oct. 02, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation All Skyworks subsidiaries are included in the Company’s consolidated financial statements and all intercompany balances are eliminated in consolidation. Certain items in the fiscal years 2019 and 2018 financial statements have been reclassified to conform to the fiscal 2020 presentation.
Fiscal Year	Fiscal YearThe Company’s fiscal year ends on the Friday closest to September 30. Fiscal 2020 consisted of 53 weeks and ended on October 2, 2020. Fiscal 2019 and 2018 each consisted of 52 weeks and ended on September 27, 2019 and September 28, 2018, respectively.
Use of Estimates	Use of Estimates 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 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, 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.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company invests excess cash in time deposits, certificate of deposits, money market funds, U.S. Treasury securities, agency securities, other government securities, corporate debt securities and commercial paper. The Company considers highly liquid investments as cash equivalents including money market funds and investments with maturities of 90 days or less when purchased.
Investments	Investments The Company classifies its investment in marketable debt securities as “available-for-sale.” Available-for-sale securities are carried at fair value with unrealized holding gains or losses recorded in other comprehensive income, net of tax. Gains or losses are included in earnings in the period in which they are realized. The cost of securities sold is determined based on the specific identification method. The cost of available-for-sale debt securities is adjusted for premiums and discounts, with the amortization or accretion of such amounts included as a portion of interest. Available-for-sale debt securities with an original maturity date greater than three months and less than one year are classified as current investments. Available-for-sale debt securities with an original maturity date exceeding one year are classified as long-term.
Fair Value	Fair Value Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principle or most advantageous market in an orderly transaction between market participants at the measurement date. Applicable accounting guidance provides a hierarchy for inputs used in measuring fair value that prioritize the use of observable inputs over the use of unobservable inputs, when such observable inputs are available. The three levels of inputs that may be used to measure fair value are as follows: •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. It is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. When available, the Company uses quoted market prices to measure fair value. If market prices are not available, the Company is required to make judgments about assumptions market participants would use to estimate the fair value of a financial instrument. The Company measures certain assets and liabilities at fair value on a recurring basis in three levels, based on the market in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. It recognizes transfers within the fair value hierarchy at the end of the fiscal quarter in which the change in circumstances that caused the transfer occurred. The carrying value of cash and cash equivalents, accounts receivable, other current assets, accounts payable and accrued liabilities approximates fair value due to the short-term maturities of these assets and liabilities.
Inventory	Inventory Inventory is stated at the lower of cost or net realizable value on a first-in, first-out basis. Reserves for excess and obsolete inventory are established on a quarterly basis and are based on a detailed analysis of aged material, salability of our inventory, market conditions, and product life cycles. Once reserves are established, write-downs of inventory are considered permanent adjustments to the cost basis of inventory.
Property, Plant and Equipment	Property, Plant, and Equipment Property, plant, and equipment are carried at cost less accumulated depreciation, with significant renewals and betterments being capitalized and retired equipment written off in the respective periods. Maintenance and repairs are expensed as incurred. Depreciation is calculated using the straight-line method over the estimated useful lives, which range from five to thirty years for buildings and improvements and three to ten years for machinery and equipment. Leasehold improvements are depreciated over the lesser of the economic life or the life of the associated lease.
Valuation of Long-Lived Assets	Valuation of Long-Lived Assets Definite lived intangible assets are carried at cost less accumulated amortization. Amortization is calculated based on the pattern of benefit to be recognized from the underlying asset over its estimated useful life. Carrying values for long-lived assets and definite lived intangible assets are reviewed for possible impairment as circumstances warrant. Factors considered important that could result in an impairment review include significant underperformance relative to expected, historical or projected future operating results, significant changes in the manner of use of assets or the Company’s business strategy, or significant negative industry or economic trends. In addition, impairment reviews are conducted at the judgment of management whenever asset values are deemed to be unrecoverable relative to future undiscounted cash flows expected to be generated by that particular asset group. The determination of recoverability is based on an estimate of undiscounted cash flows expected to result from the use of an asset group and its eventual disposition. Such estimates require management to exercise judgment and make assumptions regarding factors such as future revenue streams, operating expenditures, cost allocation and asset utilization levels, all of which collectively impact future operating performance. The Company’s estimates of undiscounted cash flows may differ from actual cash flows due to, among other things, technological changes, economic conditions, changes to its business model or changes in its operating performance. If the sum of the undiscounted cash flows is less than the carrying value of an asset group, the Company would recognize an impairment loss, measured as the amount by which the carrying value exceeds the fair value of the asset group.
Goodwill and Indefinite Intangible Assets	Goodwill and Indefinite-Lived Intangible Assets Goodwill and indefinite-lived intangible assets are not amortized but are tested at least annually as of the first day of the fourth fiscal quarter for impairment or more frequently if indicators of impairment exist during the fiscal year. The Company assesses its conclusion regarding segments and reporting units in conjunction with its annual goodwill impairment test and has determined that it has one reporting unit for the purposes of allocating and testing goodwill. The Company’s impairment analysis compares its fair value to its net book value to determine if there is an indicator of impairment. In the Company’s calculation of fair value, it considers the closing price of its common stock on the selected testing date, the number of shares of its common stock outstanding and other marketplace activity such as a related control premium. If the calculated fair value is determined to be less than the book value of the reporting unit, an impairment loss is recognized equal to that excess; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.
Revenue Recognition	Revenue Recognition The Company derives its revenue primarily from the sale of semiconductor products under individual customer purchase orders, some of which have underlying master sales agreements that specify terms governing the product sales. In the absence of a sales agreement, the Company’s standard terms and conditions apply. Revenue is recognized when control of the promised goods or services is transferred to the Company’s customers, in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The Company applies a five-step approach as defined in FASB ASC 606, Revenue from Contracts with Customers (Topic 606), in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when the corresponding performance obligation is satisfied. Each distinct promise to transfer products is considered to be an identified performance obligation for which revenue is recognized at a point in time upon transfer of control of the products to the customer. Transfer of control occurs upon shipment to the distributor or direct customer or when products are pulled from consignment inventory by the customer. Point in time recognition is determined as products manufactured under non-cancellable orders create an asset with an alternative use to the Company. Returns under the Company’s general assurance warranty of products have not been material, and warranty-related services are not considered a separate performance obligation. Pricing adjustments and estimates of returns are treated as variable consideration for purposes of determining the transaction price. Sales returns are generally accepted at the Company’s discretion or from distributors with stock rotation rights. Stock rotation allows distributors limited levels of returns and is based on the distributor’s prior purchases. Price protection represents price discounts granted to certain distributors and is based on negotiations on sales to end customers. Variable consideration is estimated using the expected value method considering all reasonably available information, including the Company’s historical experience and its current expectations, and is reflected in the transaction price when sales are recorded. The Company records net revenue excluding taxes collected on its sales to trade customers. Accounts receivable represents the Company’s unconditional right to receive consideration from its customer. Substantially all payments are collected within the Company’s standard terms, which do not include a significant financing component. To date, there have been no material impairment losses on accounts receivable. There were no material contract assets or contract liabilities recorded on the consolidated balance sheet in any of the periods presented. All incremental customer contract acquisition costs are expensed as they are incurred as the amortization period of the asset that the Company otherwise would have recognized is one year or less in duration.
Share-based Compensation	Share-Based Compensation The Company recognizes compensation expense for all share-based payment awards made to employees and directors including non-qualified employee stock options, share awards and units, employee stock purchase plan and other special share-based awards based on estimated fair values. The fair value of share-based payment awards is amortized over the requisite service period, which is defined as the period during which an employee is required to provide service in exchange for an award. The Company uses a straight-line attribution method for all grants that include only a service condition. Awards with both performance and service conditions are expensed over the service period for each separately vesting tranche. Share-based compensation expense recognized during the period includes actual expense on vested awards and expense associated with unvested awards. Forfeitures are recorded as incurred. The Company determines the fair value of share-based option awards based on the Company’s closing stock price on the date of grant using a Black-Scholes options pricing model. Under the Black-Scholes model, a number of variables are used including, but not limited to: the expected stock price volatility over the term of the award, the risk-free rate, the expected life of the award and dividend yield. The determination of fair value of restricted and certain performance stock awards and units is based on the value of the Company’s stock on the date of grant with performance awards and units adjusted for the actual outcome of the underlying performance condition. For more complex performance awards including units with market-based performance conditions the Company employs a Monte Carlo simulation valuation method to calculate the fair value of the awards based on the most likely outcome. Under the Monte Carlo simulation, a number of variables and assumptions are used including, but not limited to: the expected stock price volatility over the term of the award, a correlation coefficient, the risk-free rate, and dividend yield.
Research and Development Costs	Research and Development Costs Research and development costs are expensed as incurred.
Loss Contingencies	Loss Contingencies The Company records its best estimates of a loss contingency when it is considered probable and the amount can be reasonably estimated. When a range of loss can be reasonably estimated with no best estimate in the range, the minimum estimated liability related to the claim is recorded. As additional information becomes available, the Company assesses the potential liability related to the potential pending loss contingency and revises its estimates. Material loss contingencies are disclosed if there is at least a reasonable possibility that a loss or an additional loss may have been incurred and include estimated legal costs.
Restructuring	Restructuring A liability for post-employment benefits is recorded when payment is probable and the amount is reasonably estimable. Contract exit costs include contract termination fees and future contractual commitments for lease payments. A liability for contract exit costs is recognized in the period in which the Company terminates the contract or on the cease-use date for leased facilities.
Foreign Currencies	Foreign Currencies The Company’s functional currency is the United States dollar. Gains and losses related to foreign currency transactions and conversion of foreign denominated cash balances are included in current results.
Income Tax	Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. This method also requires the recognition of future tax benefits such as net operating loss carry forwards, to the extent that realization of such benefits is more likely than not. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The carrying value of the Company’s net deferred tax assets assumes the Company will be able to generate sufficient future taxable income in certain tax jurisdictions, based on estimates and assumptions. If these estimates and related assumptions change in the future, the Company may be required to record additional valuation allowances against its deferred tax assets resulting in additional income tax expense in its Consolidated Statement of Operations. Management evaluates the realizability of the deferred tax assets and assesses the adequacy of the valuation allowance quarterly. Likewise, in the event the Company were to determine that it would be able to realize its deferred tax assets in the future in excess of their net recorded amount, an adjustment to the deferred tax assets would increase income in the period such determination was made. The determination of recording or releasing tax valuation allowances is made, in part, pursuant to an assessment performed by management regarding the likelihood that the Company will generate future taxable income against which benefits of its deferred tax assets may or may not be realized. This assessment requires management to exercise judgment and make estimates with respect to its ability to generate revenues, gross profits, operating income, and taxable income in future periods. Amongst other factors, management must make assumptions regarding overall business and semiconductor industry conditions, operating efficiencies, the Company’s ability to develop products to its customers’ specifications, technological change, the competitive environment, and changes in regulatory requirements which may impact its ability to generate taxable income and, in turn, realize the value of its deferred tax assets. The calculation of the Company’s tax liabilities includes addressing uncertainties in the application of complex tax regulations and is based on the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company recognizes liabilities for anticipated tax audit issues in the United States and other tax jurisdictions based on its recognition threshold and measurement attribute of whether it is more likely than not that the positions the Company has taken in tax filings will be sustained upon tax audit, and the extent to which, additional taxes would be due. If payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period in which it is determined the liabilities are no longer necessary. If the estimate of tax liabilities proves to be less than the ultimate assessment, a further charge to expense would result. The Company recognizes any interest or penalties, if incurred, on any unrecognized tax liabilities or benefits as a component of income tax expense.
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share Basic earnings per share are computed using the weighted average number of common shares outstanding during the period. Diluted earnings per share incorporate the potentially dilutive incremental shares issuable upon the assumed exercise of stock options, the assumed vesting of outstanding restricted stock units, and the assumed issuance of common stock under the stock purchase plan using the treasury share 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.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) (“ASU 2016-02”). This ASU requires lessees to reflect leases with a term greater than one year on their balance sheet as assets and obligations. The Company adopted the standard in the first quarter of fiscal 2020, using the modified retrospective approach, whereby the Company was not required to adjust comparative period financial statements for the new standard. Upon adoption, the Company recorded an ROU asset of $141.4 million and a lease liability of $143.1 million. This standard did not have a material impact on the Consolidated Statement of Operations or Consolidated Statement of Cash Flows. Upon adoption, the Company elected the package of three practical expedients that permits the Company to maintain its historical conclusions about lease identification, lease classification and initial direct costs for leases that exist at the date of adoption. Further, the Company elected the practical expedient to not separate lease and non-lease components.
Lessee, Leases	Leases The Company determines if an arrangement is a lease at its inception. Right-of-use (“ROU”) assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The Company uses its estimated incremental borrowing rate in determining the present value of lease payments considering the term of the lease, which is derived from information available at the lease commencement date. The lease term includes renewal options when it is reasonably certain that the option will be exercised and excludes termination options. To the extent that the Company’s agreements have variable lease payments, the Company includes variable lease payments that depend on an index or a rate and excludes those that depend on facts or circumstances occurring after the commencement date, other than the passage of time. Lease expense for these leases is recognized on a straight-line basis over the lease term. The Company has elected not to recognize ROU assets and lease liabilities that arise from short-term (12 months or less) leases for any class of underlying asset. Operating leases are included in operating lease ROU assets, other current liabilities, and long-term operating lease liabilities in the Company's condensed consolidated balance sheet.

Fair Value (Tables)

12 Months Ended

Oct. 02, 2020

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):


	As of October 2, 2020								As of September 27, 2019
			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*	$	566.7	$	561.2	$	5.5	$	—	$	851.3	$	809.5	$	41.8	$	—
U.S. Treasury and government securities	134.4		43.2		91.2		—		54.2		28.4		25.8		—
Corporate bonds and notes	276.8		—		276.8		—		72.1		—		72.1		—
Municipal bonds	2.1		—		2.1		—		104.6		—		104.6		—
Total	$	980.0	$	604.4	$	375.6	$	—	$	1,082.2	$	837.9	$	244.3	$	—

* 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.

Inventory (Tables)

12 Months Ended

Oct. 02, 2020

Inventory, Net [Abstract]

Schedule Of Inventories

Inventory consists of the following (in millions):


	As of
	October 2, 2020		September 27, 2019
Raw materials	$	37.8	$	24.4
Work-in-process	566.4		336.2
Finished goods	198.9		245.7
Finished goods held on consignment by customers	2.9		3.4
Total inventory	$	806.0	$	609.7

Property, Plant And Equipment (Tables)

12 Months Ended

Oct. 02, 2020

Property, Plant and Equipment [Abstract]

Schedule Of Property, Plant And Equipment

Property, plant, and equipment, net consists of the following (in millions):


	As of
	October 2, 2020		September 27, 2019
Land and improvements	$	11.8	$	11.7
Buildings and improvements	424.8		354.4
Furniture and fixtures	46.5		33.8
Machinery and equipment	2,556.1		2,311.5
Construction in progress	140.7		172.5
Total property, plant, and equipment, gross	3,179.9		2,883.9
Accumulated depreciation	(1,930.4)		(1,678.3)
Total property, plant, and equipment, net	$	1,249.5	$	1,205.6

Marketable Securities (Tables)

12 Months Ended

Oct. 02, 2020

Investments, Debt and Equity Securities [Abstract]

Debt Securities, Available-for-sale

The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):


	Current				Noncurrent
Available-for-sale:	October 2, 2020		September 27, 2019		October 2, 2020		September 27, 2019
U.S. Treasury and government	$	129.4	$	34.2	$	5.0	$	20.0
Corporate bonds and notes	276.8		66.2		—		5.9
Municipal bonds	1.9		102.9		0.2		1.7
Total	$	408.1	$	203.3	$	5.2	$	27.6

Goodwill and Intangible Assets (Tables)

12 Months Ended

Oct. 02, 2020

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 average amortization period (years)	October 2, 2020						September 27, 2019
		Gross carrying amount		Accumulated amortization		Net carrying amount		Gross carrying amount		Accumulated amortization		Net carrying amount
Customer relationships	5.0	$	18.2	$	(15.8)	$	2.4	$	25.6	$	(19.5)	$	6.1
Developed technology and other	3.8	101.0		(81.6)		19.4		94.4		(48.9)		45.5
Trademarks	3.0	1.6		(1.5)		0.1		1.6		(1.3)		0.3
Technology licenses	3.0	26.3		(14.2)		12.1		$	24.9	(4.8)		20.1
IPR&D		19.5		—		19.5		$	35.9	—		35.9
Total intangible assets		$	166.6	$	(113.1)	$	53.5	$	182.4	$	(74.5)	$	107.9

Schedule of Expected Amortization Expense

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):


	2021		2022		2023		2024		2025		Thereafter
Amortization expense, cost of goods sold	$	6.0	$	0.1	$	0.1	$	0.1	$	0.1	$	1.7
Amortization expense, operating expense	$	17.0	$	5.0	$	1.0	$	1.0	$	1.0	$	0.9
Total amortization expense	$	23.0	$	5.1	$	1.1	$	1.1	$	1.1	$	2.6

Income Taxes (Tables)

12 Months Ended

Oct. 02, 2020

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

Income before income taxes consists of the following components (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
United States	$	435.9	$	427.2	$	712.2
Foreign	455.8		533.8		619.9
Income before income taxes	$	891.7	$	961.0	$	1,332.1

Schedule of Components of Income Tax Expense (Benefit)

The provision for income taxes consists of the following components(in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Current tax expense (benefit):
Federal	$	44.4	$	85.3	$	347.7
State	—		(0.1)		0.3
Foreign	49.5		23.5		31.2
	93.9		108.7		379.2
Deferred tax expense (benefit):
Federal	(6.8)		(0.4)		20.3
Foreign	(10.2)		(0.9)		14.2
	(17.0)		(1.3)		34.5

Provision for income taxes	$	76.9	$	107.4	$	413.7

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of income tax expense as computed at the United States federal statutory income tax rate to the provision for income tax expense is as follows (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Tax expense at United States statutory rate	$	187.3	$	201.8	$	327.4
Foreign tax rate difference	(86.6)		(115.3)		(111.9)
Tax on deemed repatriation	0.2		8.1		224.6
Effect of stock compensation	(10.3)		(1.6)		(25.6)
Change of tax rate on deferred taxes	—		—		18.3
Research and development credits	(23.0)		(25.7)		(19.9)
Change in tax reserve	10.1		14.0		6.7
Domestic production activities deduction	—		—		(13.9)
Global Intangible Low-Taxed Income	35.9		54.3		—
Foreign Derived Intangible Income	(41.2)		(41.5)		—
Settlements with Tax Authorities	(0.5)		4.3		—
Other, net	5.0		9.0		8.0
Provision for income taxes	$	76.9	$	107.4	$	413.7

Schedule of Deferred Tax Assets and Liabilities

Deferred income tax assets and liabilities consist of the tax effects of temporary differences related to the following (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019
Deferred tax assets:
Inventory	$	12.1	$	10.1
Bad debts	0.1		0.2
Accrued compensation and benefits	10.1		5.9
Product returns, allowances, and warranty	0.4		0.3
Restructuring	—		0.6
Share-based and other deferred compensation	25.9		21.2
Net operating loss carry forwards	7.4		11.3
Non-United States tax credits	16.5		20.7
State tax credits	115.5		106.4
Leases	43.4		—
Property, plant, and equipment	24.3		17.7
Other, net	5.8		5.9
Deferred tax assets	261.5		200.3
Less valuation allowance	(137.4)		(129.1)
Net deferred tax assets	124.1		71.2
Deferred tax liabilities:
Prepaid insurance	(0.9)		(0.5)
Property, plant, and equipment	(26.4)		(19.3)
Intangible assets	(7.6)		(17.4)
Leases	(41.5)		—
Other, net	(6.6)		(6.3)
Net deferred tax liabilities	(83.0)		(43.5)
Total net deferred tax assets	$	41.1	$	27.7

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in millions):


	Unrecognized tax benefits
Balance at September 27, 2019	$	103.3
Increases based on positions related to prior years	2.8
Decreases based on positions related to prior years	(3.9)
Increases based on positions related to current year	15.5
Decreases relating to settlements with taxing authorities	—
Decreases relating to lapses of applicable statutes of limitations	(0.1)
Balance at October 2, 2020	$	117.6

Stockholders' Equity (Tables)

12 Months Ended

Oct. 02, 2020

Stockholders' Equity Note [Abstract]

Dividends Declared

The dividends charged to retained earnings in fiscal 2020 and 2019 were as follows (in millions except per share data):


	Fiscal Years Ended
	October 2, 2020				September 27, 2019
	Per Share		Total		Per Share		Total
First quarter	$	0.44	$	75.1	$	0.38	$	67.1
Second quarter	0.44		74.9		0.38		66.0
Third quarter	0.44		73.5		0.38		65.7
Fourth quarter	0.50		83.5		0.44		75.1
	$	1.82	$	307.0	$	1.58	$	273.9

Schedule of Share-based Compensation, Stock Options, Activity

The following table represents a summary of the Company’s stock options:


	Shares (in millions)	Weighted average exercise price		Weighted average remaining contractual life (in years)	Aggregate intrinsic value (in millions)
Balance outstanding at September 27, 2019	1.3	$	65.38
Granted	—	$	98.72
Exercised	(0.9)	$	63.69
Canceled/forfeited	—	$	50.23
Balance outstanding at October 2, 2020	0.4	$	70.28	2.2	$	27.8

Exercisable at October 2, 2020	0.3	$	70.10	1.9	$	24.6

Schedule of Other Share-based Compensation, Activity

The following table represents a summary of the Company’s restricted and performance awards and units:


	Shares (in millions)	Weighted average grant date fair value
Non-vested awards outstanding at September 27, 2019	2.9	$	89.14
Granted (1)	1.4	$	99.68
Vested	(1.0)	$	85.35
Canceled/forfeited	(0.4)	$	93.44
Non-vested awards outstanding at October 2, 2020	2.9	$	94.77
(1) includes performance stock awards granted and earned assuming target performance under the underlying performance metrics

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes pre-tax share-based compensation expense by financial statement line and related tax benefit (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Cost of goods sold	$	23.2	$	13.0	$	14.4
Research and development	68.7		41.6		42.6
Selling, general and administrative	64.7		25.5		50.8
Total share-based compensation expense	$	156.6	$	80.1	$	107.8

Share-based compensation tax benefit	$	10.3	$	1.6	$	25.6
Capitalized share-based compensation expense at period end	$	10.6	$	4.7	$	2.9

Schedule of Unrecognized Compensation Cost, Nonvested Awards


	Unrecognized compensation cost for unvested awards (in millions)		Weighted average remaining recognition period (in years)
Awards	$	170.7	1.6
Options	$	0.3	0.5

Schedule of Share-based Payment Awards, Performance Shares, Valuation Assumptions Used

he fair value of these performance stock unit awards was estimated on the date of the grant using a Monte Carlo simulation with the following weighted average assumptions:


	Fiscal Year Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Volatility of common stock	32.22	%	32.65	%	35.54	%
Average volatility of peer companies	33.96	%	37.07	%	36.78	%
Average correlation coefficient of peer companies	0.61		0.47		0.47
Risk-free interest rate	1.62	%	2.98	%	1.74	%
Dividend yield	1.78	%	1.84	%	1.15	%

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of each stock option is estimated on the date of the grant using the Black-Scholes option pricing model with the following weighted average assumptions:


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Expected volatility	34.26	%	34.47	%	35.86	%
Risk-free interest rate	1.65	%	2.76	%	2.00	%
Dividend yield	1.78	%	1.84	%	1.15	%
Expected option life (in years)	4.0		4.0		4.0

Leases, Codification Topic 842 (Tables)

12 Months Ended

Oct. 02, 2020

Leases [Abstract]

Lease, Cost

Supplemental cash information and non-cash activities related to operating leases are as follows (in millions):


	Fiscal Year Ended
	October 2, 2020
Operating cash outflows from operating leases	$	25.4
Operating lease assets obtained in exchange for new lease liabilities	$	31.0

Lessee, Operating Lease, Liability, Maturity

Maturities of lease liabilities under operating leases by fiscal year are as follows (in millions):


	As of
	October 2, 2020
2021	$	25.7
2022	28.7
2023	25.1
2024	21.7
2025	20.6
Thereafter	81.6
Total lease payments	203.4
Less: imputed interest	(24.5)
Present value of lease liabilities	178.9
Less: current portion (included in other current liabilities)	(28.2)
Total	$	150.7

Schedule of Future Minimum Rental Payments for Operating Leases

Future minimum lease liabilities under non-cancelable operating leases are as follows (in millions):


	As of
	September 27, 2019
2020	$	26.7
2021	25.9
2022	24.8
2023	23.3
2024	21.5
Thereafter	97.7
Total	$	219.9

Lease, Cost, weighted-average remaining lease term, weighted-average discount rate

Weighted-average remaining lease term and discount rate related to operating leases are as follows:


	As of
	October 2, 2020
Weighted-average remaining lease term (years)	8.2
Weighted-average discount rate	3.3	%

Commitments (Tables)

12 Months Ended

Oct. 02, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Future minimum lease liabilities under non-cancelable operating leases are as follows (in millions):


	As of
	September 27, 2019
2020	$	26.7
2021	25.9
2022	24.8
2023	23.3
2024	21.5
Thereafter	97.7
Total	$	219.9

Earnings Per Share (Tables)

12 Months Ended

Oct. 02, 2020

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):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
Net income	$	814.8	$	853.6	$	918.4

Weighted average shares outstanding – basic	168.5		173.5		181.3
Dilutive effect of equity-based awards	1.4		1.0		1.9
Weighted average shares outstanding – diluted	169.9		174.5		183.2

Net income per share – basic	$	4.84	$	4.92	$	5.06
Net income per share – diluted	$	4.80	$	4.89	$	5.01

Anti-dilutive common stock equivalents	0.1		1.4		0.2

Segment Information (Tables)

12 Months Ended

Oct. 02, 2020

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

Net revenue by geographic area is as follows (in millions):


	Fiscal Years Ended
	October 2, 2020		September 27, 2019		September 28, 2018
United States	$	2,012.8	$	1,860.4	$	1,946.2
China	700.7		718.7		982.8
South Korea	254.6		365.5		432.7
Taiwan	240.4		271.1		339.1
Europe, Middle East, and Africa	122.9		134.9		144.6
Other Asia-Pacific	24.3		26.2		22.6
Total	$	3,355.7	$	3,376.8	$	3,868.0

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

Net property, plant, and equipment balances, based on the physical locations within the indicated geographic areas are as follows (in millions):


	As of
	October 2, 2020		September 27, 2019
Japan	$	507.0	$	491.9
Mexico	364.9		351.5
Singapore	237.4		229.9
United States	124.8		117.6
Rest of world	15.4		14.7
	$	1,249.5	$	1,205.6

Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Oct. 02, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

15. QUARTERLY FINANCIAL DATA (UNAUDITED)

The following table summarizes the quarterly and annual results (in millions, except per share data). Amounts may not total for the fiscal year due to rounding:


	First quarter		Second quarter		Third quarter		Fourth quarter		Fiscal year
Fiscal 2020
Net revenue	$	896.1	$	766.1	$	736.8	$	956.8	$	3,355.7
Gross profit	444.3		375.6		334.1		458.9		1,612.9
Net income	257.1		181.1		129.7		246.9		814.8
Per share data (1)
Net income, basic	$	1.51	$	1.07	$	0.78	$	1.48	$	4.84
Net income, diluted	$	1.50	$	1.06	$	0.77	$	1.46	$	4.80

Fiscal 2019
Net revenue	$	972.0	$	810.4	$	767.0	$	827.4	$	3,376.8
Gross profit	485.1		400.2		312.5		406.0		1,603.8
Net income	284.9		214.0		144.1		210.6		853.6
Per share data (1)
Net income, basic	$	1.61	$	1.23	$	0.83	$	1.23	$	4.92
Net income, diluted	$	1.60	$	1.23	$	0.83	$	1.22	$	4.89

____________

(1) Earnings per share calculations for each of the quarters are based on the weighted average number of shares outstanding and included common stock equivalents in each period. Therefore, the sums of the quarters do not necessarily equal the full year earnings per share.

Summary of Significant Accounting Policies (Details)	12 Months Ended
Summary of Significant Accounting Policies (Details)	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Accounting Policies [Line Items]
Weeks in fiscal year	371 days	364 days	364 days

Summary of Significant Accounting Policies Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Oct. 02, 2020	Sep. 27, 2019
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Lease, Right-of-Use Asset	$ 167,900	$ 0
Operating Lease, Liability	178,900
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Lease, Right-of-Use Asset	141,400
Operating Lease, Liability	$ 143,100

Business Combinations (Details) - USD ($) $ in Millions	12 Months Ended
Business Combinations (Details) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired	$ 0.0	$ 0.0	$ 404.0

Fair Value (Narrative) (Details) $ in Thousands	12 Months Ended
Fair Value (Narrative) (Details) $ in Thousands	Oct. 02, 2020 USD ($)
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount	0
Increases to Level 3 liabilities	0
Decreases of Level 3 liabilities	0
Impairment of Intangible Assets (Excluding Goodwill)	$ 9,800

Fair Value (Schedule Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decreases of Level 3 liabilities	$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	980,000	$ 1,082,200
Cash and Cash Equivalents, Fair Value Disclosure	566,700	851,300
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	604,400	837,900
Cash and Cash Equivalents, Fair Value Disclosure	561,200	809,500
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	375,600	244,300
Cash and Cash Equivalents, Fair Value Disclosure	5,500	41,800
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Cash and Cash Equivalents, Fair Value Disclosure	0	0
US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	134,400	54,200
US Treasury and Government [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	43,200	28,400
US Treasury and Government [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	91,200	25,800
US Treasury and Government [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	276,800	72,100
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	276,800	72,100
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	2,100
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale		104,600
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	2,100	104,600
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	$ 0	$ 0

Fair Value (Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) $ in Thousands	12 Months Ended
	Oct. 02, 2020 USD ($)
Fair Value, Assets [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Increases to Level 3 liabilities	0
Decreases of Level 3 liabilities	$ 0

Fair Value (Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation) (Details) $ in Thousands	12 Months Ended
	Oct. 02, 2020 USD ($)
Fair Value, Liabilities [Roll Forward]
Increases to Level 3 liabilities	$ 0

Inventory (Schedule Of Inventories) (Details) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019
Inventory, Net [Abstract]
Raw materials	$ 37.8	$ 24.4
Work-in-process	566.4	336.2
Finished goods	198.9	245.7
Finished goods held on consignment by customers	2.9	3.4
Total inventories	$ 806.0	$ 609.7

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,179.9	$ 2,883.9
Accumulated depreciation and amortization	(1,930.4)	(1,678.3)
Total property, plant and equipment, net	1,249.5	1,205.6
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	11.8	11.7
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	424.8	354.4
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	46.5	33.8
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	2,556.1	2,311.5
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 140.7	$ 172.5

Marketable Securities (Details) - USD ($) $ in Millions	12 Months Ended
Marketable Securities (Details) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Noncurrent, Maximum Contractual Maturity	2 years
Debt Securities, Available-for-sale, Current	$ 408.1	$ 203.3
Debt Securities, Available-for-sale, Noncurrent	5.2	27.6
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	129.4	34.2
Debt Securities, Available-for-sale, Noncurrent	5.0	20.0
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	276.8	66.2
Debt Securities, Available-for-sale, Noncurrent	0.0	5.9
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Current	1.9	102.9
Debt Securities, Available-for-sale, Noncurrent	$ 0.2	$ 1.7

Marketable Securities Schedule of Available for sale securities (Details) - USD ($) $ in Thousands	Oct. 02, 2020	Sep. 27, 2019
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	$ 300
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	$ 200
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		$ (100)

Goodwill and Intangible Assets (Changes in Goodwill) (Details) $ in Millions	Oct. 02, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill at beginning of the period	$ 1,189.8
Goodwill at end of the period	$ 1,189.8

Goodwill and Intangible Assets (Schedule of Intangible Assets Excluding Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Intangible Assets Excluding Goodwill [Line Items]
Goodwill	$ 1,189,800	$ 1,189,800
Gross carrying amount	166,600	182,400
Accumulated amortization	(113,100)	(74,500)
Net carrying amount	$ 53,500	107,900
Customer Relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	5 years
Gross carrying amount	$ 18,200	25,600
Accumulated amortization	(15,800)	(19,500)
Net carrying amount	$ 2,400	6,100
Developed Technology and Other [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	3 years 9 months 18 days
Gross carrying amount	$ 101,000	94,400
Accumulated amortization	(81,600)	(48,900)
Net carrying amount	19,400	45,500
Trademarks [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	1,600	1,600
Accumulated amortization	(1,500)	(1,300)
Net carrying amount	$ 100	300
Licensing Agreements [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	3 years
Gross carrying amount	$ 26,300	24,900
Accumulated amortization	(14,200)	(4,800)
Net carrying amount	12,100	20,100
Accrued Liabilities	11,500	20,100
In Process Research and Development [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	19,500	35,900
Accumulated amortization	0	0
Net carrying amount	$ 19,500	$ 35,900
Trade Names [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	3 years

Goodwill and Intangible Assets (Schedule of Future Amortization Expense) (Details) $ in Millions	Oct. 02, 2020 USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 23.0
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1.1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1.1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1.1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	2.6
Operating Expense [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	17.0
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5.0
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1.0
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1.0
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1.0
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	0.9
Cost of Sales [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	6.0
Finite-Lived Intangible Assets, Amortization Expense, Year Two	0.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	0.1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	0.1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	0.1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 1.7

Income Taxes (Income before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Income Tax Disclosure [Abstract]
United States	$ 435.9	$ 427.2	$ 712.2
Foreign	455.8	533.8	619.9
Income before income taxes	$ 891.7	$ 961.0	$ 1,332.1

Income Taxes (Income Tax Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Current tax expense (benefit):
Federal	$ 44.4	$ 85.3	$ 347.7
State	0.0	(0.1)	0.3
Foreign	49.5	23.5	31.2
Current Income Tax Expense	93.9	108.7	379.2
Deferred tax expense (benefit):
Federal	(6.8)	(0.4)	20.3
Foreign	(10.2)	(0.9)	14.2
Deferred Income Tax Expense	(17.0)	(1.3)	34.5
Provision for income taxes	$ 76.9	$ 107.4	$ 413.7

Income Taxes (Income Tax Expense Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Income Tax Disclosure [Abstract]
Tax expense at United States statutory rate	$ 187.3	$ 201.8	$ 327.4
Foreign tax rate difference	(86.6)	(115.3)	(111.9)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	0.2	8.1	224.6
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	(10.3)	(1.6)	(25.6)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0.0	0.0	18.3
Research and development credits	(23.0)	(25.7)	(19.9)
Change in tax reserve	10.1	14.0	6.7
Domestic production activities deduction	0.0	0.0	(13.9)
EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	35.9	54.3	0.0
EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncome	(41.2)	(41.5)	0.0
Audit settlement and adjustment	(0.5)	4.3	0.0
Other, net	5.0	9.0	8.0
Provision for income taxes	$ 76.9	$ 107.4	$ 413.7

Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Income Taxes [Line Items]
United States tax rate	21.00%	21.00%	24.60%
Foreign tax rate difference	$ (86,600)	$ (115,300)	$ (111,900)
Income tax holiday	September 30, 2030
Impact of tax holiday	$ 63,100	$ 32,800	$ 38,400
Impact of tax holiday on diluted earnings per share (in dollars per share)	$ 0.37	$ 0.19	$ 0.21
Valuation Allowance, Amount	$ 137,400	$ 129,100
Tax benefit to recognize if valuation allowance is reversed	137,400
Future taxable income needed to utilize deferred tax assets	124,100
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	8,300	10,500
Total unrecognized tax benefits that would impact the effective tax rate	95,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	4,600	6,000	$ 4,100
Previously unrecognized tax benefits related to the expiration of the statute of limitations	100
Decreases relating to settlements with taxing authorities	0
Accrued interest or penalties related to unrecognized tax benefit	16,100	12,700
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	200	8,100	224,600
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	0	18,300
EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	35,900	54,300	0
EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncome	(41,200)	(41,500)	$ 0
Income Tax Examination, Penalties and Interest Accrued	3,800
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	18,600
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	118,800
Tax credit carryforward	115,400
UNITED STATES
Income Taxes [Line Items]
Federal net operating loss carry forwards	$ 8,100
Open tax year	2001
CALIFORNIA
Income Taxes [Line Items]
Open tax year	1999
CANADA
Income Taxes [Line Items]
Open tax year	2013
MEXICO
Income Taxes [Line Items]
Open tax year	2014
JAPAN
Income Taxes [Line Items]
Open tax year	2014
SINGAPORE
Income Taxes [Line Items]
Open tax year	2014
Other Current Liabilities [Member]
Income Taxes [Line Items]
Foreign Earnings Repatriated	$ 18,600	18,800
Other Noncurrent Liabilities [Member]
Income Taxes [Line Items]
Foreign Earnings Repatriated	$ 177,000	$ 195,900

Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Oct. 02, 2020	Sep. 27, 2019
Deferred tax assets:
Inventory	$ 12,100	$ 10,100
Bad debts	100	200
Accrued compensation and benefits	10,100	5,900
Product returns, allowances and warranty	400	300
Restructuring	0	600
Share-based and other deferred compensation	25,900	21,200
Net operating loss carry forwards	7,400	11,300
Federal tax credits	16,500	20,700
State tax credits	115,500	106,400
Deferred Tax Assets, Property, Plant and Equipment	24,300	17,700
Other - net	5,800	5,900
Deferred tax assets	261,500	200,300
Less valuation allowance	(137,400)	(129,100)
Net deferred tax assets	124,100	71,200
Deferred Tax Liabilities, Prepaid Expenses	900	500
Deferred tax liabilities:
Prepaid insurance	(6,600)	(6,300)
Property, plant and equipment	(26,400)	(19,300)
Intangible assets	(7,600)	(17,400)
Deferred Tax Liabilities, Net	83,000	43,500
Total deferred tax assets	41,100	27,700
Deferred Tax Liabilities, Leasing Arrangements	(41,500)	0
deferred tax asset, leasing arrangements	$ 43,400	$ 0

Income Taxes (Changes in Unrecognized Tax Benefit) (Details) $ in Millions	12 Months Ended
	Oct. 02, 2020 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 2.8
Balance at September 30, 2016	103.3
Decreases based on positions related to prior years	(3.9)
Increases based on positions related to current year	15.5
Decreases relating to settlements with taxing authorities	0.0
Decreases relating to lapses of applicable statues of limitations	(0.1)
Balance at September 29, 2017	$ 117.6

Stockholders' Equity (Common and Preferred Shares) (Details) - $ / shares shares in Millions	Oct. 02, 2020	Sep. 27, 2019
Stockholders' Equity Note [Abstract]
Common stock, shares authorized (in shares)	525.0	525.0
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares issued (in shares)	232.3	230.2
Common stock, shares outstanding (in shares)	165.6	170.1
Preferred stock, shares authorized (in shares)	25.0	25.0

Stockholders' Equity (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Share Repurchase [Line Items]
Share repurchase program	$ 647.5	$ 657.6	$ 759.5
Share repurchase program (in shares)	(6.3)	(8.9)	(7.7)
Treasury stock, average price per share (in dollars per share)	$ (102.74)	$ (74.26)	$ (98.84)
Remaining shares available under share repurchase program	$ 978.8
Authorized repurchased amount	$ 2,000.0

Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended								12 Months Ended
	Dec. 10, 2020	Nov. 19, 2020	Nov. 02, 2020	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Subsequent Event [Line Items]
Cash dividends declared and paid per share (in dollars per share)				$ 0.50	$ 0.44	$ 0.44	$ 0.44	$ 0.44	$ 0.38	$ 0.38	$ 0.38	$ 1.82	$ 1.58	$ 1.34
Cash dividends declared and paid				$ 83.5	$ 73.5	$ 74.9	$ 75.1	$ 75.1	$ 65.7	$ 66.0	$ 67.1	$ 307.0	$ 273.9
Dividend Declared [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends payable, date declared			Nov. 02, 2020
Cash dividends declared and paid per share (in dollars per share)			$ 0.50
Dividends payable, date to be paid	Dec. 10, 2020
Dividends payable, date of record		Nov. 19, 2020

Stockholders' Equity (Employee Stock Benefit Plans) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	65,200
Options outstanding (in shares)	400	1,300
Shares available for grant (in shares)	11,000
Employee Contributions To ESPP	10.00%
Weighted average grant fair value, grants in period	$ 24.49	$ 21.74	$ 68.32
Capitalized stock based compensation	$ 10.6	$ 4.7	$ 2.9
Share-based compensation	$ 156.6	$ 80.1	$ 107.8
Director Long Term Incentive Plan 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,500
Shares available for grant (in shares)	600
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	19,400
Options outstanding (in shares)	400
Shares available for grant (in shares)	10,400
Equity incentive plan performance shares maximum vesting period	3 years
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	11,600
ESPP shares issued (in shares)	300	300	200
Shares available for grant (in shares)	1,800
Percent of market price	85.00%
Share-based compensation	$ 6.6	$ 5.8	$ 5.2
Unrecognized Compensation Cost for unvested awards	$ 3.1
Weighted average remaining recognition period (in years)	4 months
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost for unvested awards	$ 170.7
Weighted average remaining recognition period (in years)	1 year 7 months 6 days
Restricted Stock [Member] \| Director Long Term Incentive Plan 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Restricted Stock [Member] \| Long Term Incentive Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost for unvested awards	$ 0.3
Weighted average remaining recognition period (in years)	6 months
Stock Options [Member] \| Director Long Term Incentive Plan 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life maximum	10 years
Vesting period	4 years
Stock Options [Member] \| Long Term Incentive Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life maximum	7 years
Vesting period	4 years
Performance Shares [Member] \| Long Term Incentive Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years

Stockholders' Equity (Stock Options) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Oct. 02, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance outstanding at October 2, 2015 (in shares) \| shares	1,300
Granted (in shares) \| shares	0
Exercised (in shares) \| shares	(900)
Balance outstanding at September 30, 2016 (in shares) \| shares	400
Shares exercisable (in shares) \| shares	300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock options outstanding, weighted average exercise price, beginning balance \| $ / shares	$ 65.38
Granted, weighted average exercise price \| $ / shares	98.72
Exercised, weighted average exercise price \| $ / shares	63.69
Canceled/forfeited, weighted average exercise price \| $ / shares	50.23
Stock options outstanding, weighted average exercise price, ending balance \| $ / shares	70.28
Weighted average exercise price (in dollars per share) \| $ / shares	$ 70.10
Weighted average remaining contractual life, outstanding	2 years 2 months 12 days
Weighted average remaining contractual life, exercisable	1 year 10 months 24 days
Aggregate intrinsic value \| $	$ 27.8
Aggregate intrinsic value \| $	$ 24.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period \| shares	0
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	2 years 2 months 12 days

Stockholders' Equity (Restricted and Performance based Awards) (Details) - $ / shares shares in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested awards outstanding at September 30, 2016	2,900
Granted	1,400
Vested	(1,000)
Canceled/ forfeited	(400)
Non-vested awards outstanding at September 29, 2017	2,900	2,900
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested awards outstanding, weighted average exercise price, beginning balance	$ 89.14
Granted, weighted average exercise price	99.68	$ 78.41	$ 108.86
Vested, weighted average exercise price	85.35
Cancelled/forfeited, weighted average exercise price	93.44
weighted average exercise price, ending balance	$ 94.77	$ 89.14

Stockholders' Equity (Summary of Total Intrinsic Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 44.2	$ 26.4	$ 75.0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 100.9	$ 67.7	$ 134.4

Stockholders' Equity (Share Based Expense Allocation) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 156.6	$ 80.1	$ 107.8
Share-based compensation tax benefit	10.3	1.6	25.6
Capitalized stock based compensation	10.6	4.7	2.9
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	23.2	13.0	14.4
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	68.7	41.6	42.6
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	$ 64.7	$ 25.5	$ 50.8

Stockholders' Equity (Compensation Costs Related to Unvested Awards) (Details) $ in Millions	12 Months Ended
	Oct. 02, 2020 USD ($)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost for unvested awards	$ 0.3
Weighted average remaining recognition period (in years)	6 months
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost for unvested awards	$ 170.7
Weighted average remaining recognition period (in years)	1 year 7 months 6 days

Stockholders' Equity (Schedule Of Weighted Average Assumptions Used in Calculating Share-Based Performance Awards) (Details) - Performance Shares [Member]	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate	32.22%	32.65%	35.54%
Average volatility of peer companies	33.96%	37.07%	36.78%
Average correlation coefficient of peer group	0.61	0.47	0.47
Risk free interest rate	1.62%	2.98%	1.74%
Dividend yield	1.78%	1.84%	1.15%

Stockholders' Equity (Schedule Of Weighted Average Assumptions Used In Calculating Share-Based Compensation Option Expense) (Details) - Stock Options [Member]	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate	34.26%	34.47%	35.86%
Risk-free interest rate	1.65%	2.76%	2.00%
Dividend yield	1.78%	1.84%	1.15%
Expected option life (in years)	4 years	4 years	4 years

Leases, Codification Topic 842 (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Leases [Abstract]
Operating Lease, Expense	$ 28,100
Variable Lease, Cost	7,600
Rent expense		$ 18,700	$ 20,500
Operating Lease, Payments	25,400
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	31,000
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	25,700
Lessee, Operating Lease, Liability, Payments, Due Year Two	28,700
Lessee, Operating Lease, Liability, Payments, Due Year Three	25,100
Lessee, Operating Lease, Liability, Payments, Due Year Four	21,700
Lessee, Operating Lease, Liability, Payments, Due Year Five	20,600
Lessee, Operating Lease, Liability, Payments, Due after Year Five	81,600
Lessee, Operating Lease, Liability, Payments, Due	203,400
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(24,500)
Operating Lease, Liability	$ 178,900
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent	$ 150,700	0
2018		26,700
2019		25,900
2020		24,800
2021		23,300
2022		21,500
Thereafter		97,700
Operating Leases, Future Minimum Payments Due		$ 219,900
Operating Lease, Weighted Average Remaining Lease Term	8 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.30%

Commitments (Rent Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Rent expense	$ 18.7	$ 20.5
2018	26.7
2019	25.9
2020	24.8
2021	23.3
2022	21.5
Thereafter	97.7
Operating Leases, Future Minimum Payments Due	$ 219.9

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Earnings Per Share [Abstract]
Net income	$ 246.9	$ 129.7	$ 181.1	$ 257.1	$ 210.6	$ 144.1	$ 214.0	$ 284.9	$ 814.8	$ 853.6	$ 918.4
Weighted average shares outstanding - basic									168.5	173.5	181.3
Effect of dilutive equity based awards									1.4	1.0	1.9
Weighted average shares outstanding - diluted									169.9	174.5	183.2
Net income per share - basic (in dollars per share)	$ 1.48	$ 0.78	$ 1.07	$ 1.51	$ 1.23	$ 0.83	$ 1.23	$ 1.61	$ 4.84	$ 4.92	$ 5.06
Net income per share - diluted (in dollars per share)	$ 1.46	$ 0.77	$ 1.06	$ 1.50	$ 1.22	$ 0.83	$ 1.23	$ 1.60	$ 4.80	$ 4.89	$ 5.01
Anti-dilutive common stock equivalents									0.1	1.4	0.2

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Segment Information (Geographic Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 956,800	$ 736,800	$ 766,100	$ 896,100	$ 827,400	$ 767,000	$ 810,400	$ 972,000	$ 3,355,700	$ 3,376,800	$ 3,868,000
Contract with Customer, Refund Liability	$ 20,300				$ 38,500				20,300	38,500
Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									2,012,800	1,860,400	1,946,200
China
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									700,700	718,700	982,800
Taiwan
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									240,400	271,100	339,100
South Korea
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									254,600	365,500	432,700
Asia
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									122,900	134,900	144,600
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 24,300	$ 26,200	$ 22,600

Segment Information (Geographical Fixed Assets) (Details) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019
Property, Plant and Equipment, Net	$ 1,249.5	$ 1,205.6
MEXICO
Property, Plant and Equipment, Net	364.9	351.5
SINGAPORE
Property, Plant and Equipment, Net	507.0	491.9
UNITED STATES
Property, Plant and Equipment, Net	124.8	117.6
JAPAN
Property, Plant and Equipment, Net	237.4	229.9
Foreign Member Other [Member]
Property, Plant and Equipment, Net	$ 15.4	$ 14.7

Segment Information (Concentration) (Details)	12 Months Ended
Segment Information (Concentration) (Details)	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Accounts receivable from major customers percentage	70.00%	67.00%	66.00%
Company A [Member]
Concentration Risk [Line Items]
Revenue from major customers percentage	56.00%	51.00%	47.00%

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Selected Quarterly Financial Information [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 956,800	$ 736,800	$ 766,100	$ 896,100	$ 827,400	$ 767,000	$ 810,400	$ 972,000	$ 3,355,700	$ 3,376,800	$ 3,868,000
Gross Profit	458,900	334,100	375,600	444,300	406,000	312,500	400,200	485,100	1,612,900	1,603,800	1,950,700
Net income	$ 246,900	$ 129,700	$ 181,100	$ 257,100	$ 210,600	$ 144,100	$ 214,000	$ 284,900	$ 814,800	$ 853,600	$ 918,400
Net income, basic (in dollars per share)	$ 1.48	$ 0.78	$ 1.07	$ 1.51	$ 1.23	$ 0.83	$ 1.23	$ 1.61	$ 4.84	$ 4.92	$ 5.06
Net income, diluted (in dollars per share)	$ 1.46	$ 0.77	$ 1.06	$ 1.50	$ 1.22	$ 0.83	$ 1.23	$ 1.60	$ 4.80	$ 4.89	$ 5.01

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details