Document And Entity Information (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Nov. 22, 2011	Apr. 01, 2011
Document Information [Line Items]
Entity Registrant Name	Skyworks Solutions, Inc.
Entity Central Index Key	0000004127
Document Type	10-K
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 5,808,022,900
Entity Common Stock, Shares Outstanding		187,889,808

Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified

12 Months Ended

Sep. 30, 2011

Oct. 01, 2010

Oct. 02, 2009

Net revenue

$ 1,418,922

$ 1,071,849

$ 802,577

Cost of goods sold

798,618

615,016

484,357

Gross profit

620,304

456,833

318,220

Operating expenses:

Research and development

168,637

134,140

123,996

Selling, general and administrative

137,238

117,853

100,421

Amortization of intangibles

16,742

6,136

6,118

Restructuring and other charges (credits)

2,363

(1,040)

15,982

Total operating expenses

324,980

257,089

246,517

Operating income

295,324

199,744

71,703

Interest expense

(1,936)

(4,246)

(8,290)

(Loss) gain on early retirement of convertible debt

(79)

4,590

Other income (loss), net

498

(345)

1,753

Income before income taxes

293,886

195,074

69,756

Provision (benefit) for income taxes

67,301

57,780

(25,227)

Net income

$ 226,585

$ 137,294

$ 94,983

Earnings per share:

Basic

$ 1.24

^[1]

$ 0.78

^[1]

$ 0.57

Diluted

$ 1.19

^[1]

$ 0.75

^[1]

$ 0.56

Weighted average shares:

Basic

182,879

175,020

167,047

^[2]

Diluted

190,667

182,738

169,663

^[2]

[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.
[2]	WARNING: Unable to load text selection TextSelection:12F36C2A0AF9E87ED18083A92AEA5295

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Oct. 01, 2010
Current assets:
Cash and cash equivalents	$ 410,087	$ 453,257
Restricted cash	712	6,128
Receivables, net of allowance for doubtful accounts of $785 and $1,177, respectively	177,940	175,232
Inventory	198,183	125,059
Other current assets	29,412	30,189
Total current assets	816,334	789,865
Property, plant and equipment, net	251,365	204,363
Goodwill	663,041	485,587
Intangible assets, net	86,808	12,509
Deferred tax assets, net	60,863	60,569
Other assets	11,978	11,159
Total assets	1,890,389	1,564,052
Current liabilities:
Short-term debt	26,089	50,000
Accounts payable	115,290	111,967
Accrued compensation and benefits	35,684	35,695
Other current liabilities	70,033	6,662
Total current liabilities	247,096	204,324
Long-term debt, less current maturities	0	24,743
Other long-term liabilities	34,198	18,389
Total liabilities	281,294	247,456
Commitments and contingencies (Note 13 and Note 14)
Stockholders' equity:
Preferred stock, no par value: 25,000 shares authorized, no shares issued
Common stock, $0.25 par value: 525,000 shares authorized; 195,407 shares issued and 186,386 shares outstanding at September 30, 2011 and 185,683 shares issued and 180,263 shares outstanding at October 1, 2010	46,597	45,066
Additional paid-in capital	1,795,958	1,641,406
Treasury stock, at cost	(130,854)	(40,719)
Accumulated deficit	(101,275)	(327,860)
Accumulated other comprehensive loss	(1,331)	(1,297)
Total stockholders' equity	1,609,095	1,316,596
Total liabilities and stockholders' equity	$ 1,890,389	$ 1,564,052

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2011	Oct. 01, 2010
Current assets:
Allowance for doubtful accounts	$ 785	$ 1,177
Stockholders' Equity:
Preferred stock, par value
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued
Common stock, par value	$ 0.25	$ 0.25
Common stock, shares authorized	525,000,000	525,000,000
Common stock, shares issued	195,407,396	185,683,000
Common stock, shares outstanding	186,386,197	180,263,000

Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Cash flows from operating activities:
Net income	$ 226,585	$ 137,294	$ 94,983
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	58,338	40,741	23,466
Depreciation	59,788	46,573	44,413
Amortization of intangible assets	16,742	6,136	6,118
Amortization of discount and deferred financing costs on convertible debt	1,434	2,693	5,589
Contribution of common shares to savings and retirement plans	13,718	11,706	8,502
Non-cash restructuring (income) expense	(17)	0	955
Deferred income taxes	12,370	38,543	(24,866)
Excess tax benefit from share-based payments	(12,490)	(6,287)	0
Loss on disposals of assets	234	292	411
Inventory write-downs	0	0	3,458
Asset impairments	0	0	5,616
Provision for (recoveries) losses on accounts receivable	(220)	703	1,797
Changes in assets and liabilities net of acquired balances:
Receivables	13,168	(60,901)	29,947
Inventory	(49,694)	(38,818)	15,678
Other current and long-term assets	(1,732)	(8,349)	(3,932)
Accounts payable	(14,350)	42,869	9,219
Other current and long-term liabilities	41,944	9,767	(2,549)
Net cash provided by operating activities	365,818	222,962	218,805
Cash flows from investing activities:
Capital expenditures	(100,660)	(88,929)	(39,172)
Payments for acquisitions, net of cash acquired	(249,284)	(6,400)	(10,356)
Net cash used in investing activities	(349,944)	(95,329)	(49,528)
Cash flows from financing activities:
Retirement of 2007 Convertible Notes	0	(51,107)	(51,107)
Reacquisition of equity component of 2007 Convertible Notes	0	(29,602)	(15,432)
Payments to retire short term line of credit	(50,000)	0	0
Excess tax benefit from share-based payments	12,490	6,287	0
Change in restricted cash	5,416	(265)	100
Repurchase of common stock - payroll tax withholdings on equity awards	(20,092)	(4,412)	(2,389)
Repurchase of common stock - share repurchase program	(70,043)	0	0
Net proceeds from exercise of stock options	63,185	40,502	38,668
Net cash used in financing activities	(59,044)	(38,597)	(30,160)
Net (decrease) increase in cash and cash equivalents	(43,170)	89,036	139,117
Cash and cash equivalents at beginning of period	453,257	364,221	225,104
Cash and cash equivalents at end of period	410,087	453,257	364,221
Supplemental cash flow disclosures:
Income taxes paid	16,094	14,757	1,009
Interest paid	$ 475	$ 715	$ 2,323

Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) Statement (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity Attributable to Parent, Beginning Balance at Oct. 03, 2008	$ 961,604	$ 41,398	$ (33,918)	$ 1,515,441	$ (560,137)	$ (1,180)
Shares, Issued, beginning of period at Oct. 03, 2008		165,592,000	4,732,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	94,983				94,983
Pension adjustment	(200)					(200)
Other comprehensive loss	(200)					(200)
Comprehensive income	94,783
Issuance and epense of common shares for stock pruchase plans, 401(k) and stock option plans, Shares of Common Stock		7,159,000
Issuance and expense of common shares for stock purchase plans, 401(k) and stock option plans	61,004	1,790		59,214
Reacquisition of equity components of convertible notes	(15,432)			(15,432)
Issuance and expense of common shares for restricted stock and performance shares, Shares of Common Stock		390,000
Issuance and expense of common shares for restricted stock and performance shares	9,209	98		9,111
Shares withheld for taxes, Shares of Common Stock		(326,000)	(326,000)
Shares withheld for taxes Value	(2,389)	(82)	(2,389)	82
Stockholders' Equity Attributable to Parent, Ending Balance at Oct. 02, 2009	1,108,779	43,204	(36,307)	1,568,416	(465,154)	(1,380)
Shares, Issued, end of period at Oct. 02, 2009		172,815,000	5,058,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	137,294				137,294
Pension adjustment	83					83
Other comprehensive loss	83					83
Comprehensive income	137,377
Issuance and epense of common shares for stock pruchase plans, 401(k) and stock option plans, Shares of Common Stock		6,083,000
Issuance and expense of common shares for stock purchase plans, 401(k) and stock option plans	70,931	1,521		69,410
Reacquisition of equity components of convertible notes	(28,832)			(28,832)
Excess tax benefit from share based compensation	11,491			11,491
Issuance and expense of common shares for restricted stock and performance shares, Shares of Common Stock		1,727,000
Issuance and expense of common shares for restricted stock and performance shares	21,262	432		20,830
Shares withheld for taxes, Shares of Common Stock		(362,000)	(362,000)
Shares withheld for taxes Value	(4,412)	(91)	(4,412)	91
Stockholders' Equity Attributable to Parent, Ending Balance at Oct. 01, 2010	1,316,596	45,066	(40,719)	1,641,406	(327,860)	(1,297)
Shares, Issued, end of period at Oct. 01, 2010		180,263,000	5,420,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	226,585				226,585
Pension adjustment	(34)					(34)
Other comprehensive loss	(34)					(34)
Comprehensive income	226,551
Issuance and epense of common shares for stock pruchase plans, 401(k) and stock option plans, Shares of Common Stock		6,598,000
Issuance and expense of common shares for stock purchase plans, 401(k) and stock option plans	101,731	1,650		100,081
Share repurchase program, Shares of Treasury Stock	(2,768,045)	(2,768,000)	(2,768,000)
Share repurchase program	(70,043)	(692)	(70,043)	692
Excess tax benefit from share based compensation	17,572			17,572
Issuance and expense of common shares for restricted stock and performance shares, Shares of Common Stock		3,126,000
Issuance and expense of common shares for restricted stock and performance shares	36,780	781		35,999
Shares withheld for taxes, Shares of Common Stock		(833,000)	(833,000)
Shares withheld for taxes Value	(20,092)	(208)	(20,092)	208
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2011	$ 1,609,095	$ 46,597	$ (130,854)	$ 1,795,958	$ (101,275)	$ (1,331)
Shares, Issued, end of period at Sep. 30, 2011		186,386,000	9,021,000

Description Of Business And Basis Of Presentation	12 Months Ended
Description Of Business And Basis Of Presentation	Sep. 30, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description and Basis of Presentation [Text Block]	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Skyworks Solutions, Inc. together with its consolidated subsidiaries, (“Skyworks” or the “Company”) is an innovator of high reliability analog and mixed signal semiconductors. Leveraging core technologies, Skyworks offers diverse standard and custom linear products supporting automotive, broadband, cellular infrastructure, energy management, industrial, medical, military and cellular handset applications. The Company's portfolio includes amplifiers, attenuators, circulators, detectors, diodes, directional couplers, front-end modules, hybrids, infrastructure RF subsystems, isolators, mixers/demodulators, optocouplers, optoisolators, phase shifters, PLLs/synthesizers/VCOs, power dividers/combiners, receivers, switches and technical ceramics. The Company has evaluated subsequent events through the date of issuance of the audited consolidated financial statements.

Summary of Significant Accounting Policies

12 Months Ended

Sep. 30, 2011

Accounting Policies [Abstract]

Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

PRINCIPLES OF CONSOLIDATION

All majority owned subsidiaries are included in the Company’s Consolidated Financial Statements and all intercompany balances are eliminated in consolidation.

FISCAL YEAR

The Company’s fiscal year ends on the Friday closest to September 30. Fiscal years 2011, 2010 and 2009 each consisted of 52 weeks and ended on September 30, 2011, October 1, 2010 and October 2, 2009, respectively.

USE OF ESTIMATES

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company evaluates its estimates on an ongoing basis using historical experience and other factors, including the current economic environment. Significant judgment is required in determining the reserves for and fair value of items such as reserves for inventory, income taxes, share-based compensation, loss contingencies, bad debt, contingent consideration associated with business combinations, and fair value assessments of assets and liabilities. In addition, significant 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 tests. Management’s estimates could differ significantly from actual results.

REVENUE RECOGNITION

Revenues from product sales are recognized upon shipment and transfer of title, in accordance with the shipping terms specified in the arrangement with the customer. Revenue from license fees and intellectual property is recognized when due and payable, and all other criteria of Accounting Standards Codification ("ASC") 605-Revenue Recognition, have been met. The Company ships product on consignment to certain customers and only recognizes revenue when the customer notifies us that the inventory has been consumed. Revenue recognition is deferred in all instances where the earnings process is incomplete. Certain product sales are made to electronic component distributors under agreements allowing for price protection and/or a right of return (stock rotation) on unsold products. A reserve for sales returns and allowances for customers is recorded based on historical experience or specific identification of a contractual arrangement necessitating a revenue reserve.

ALLOWANCE FOR DOUBTFUL ACCOUNTS

The Company maintains general allowances for doubtful accounts for losses that they estimate will arise from their customers’ inability to make required payments. These reserves require management to apply judgment in deriving estimates. As the Company becomes aware of any specific receivables which may be uncollectable, they perform additional analysis and reserves are recorded if deemed necessary. Determination of such additional specific reserves require management to make judgments and estimates pertaining to factors such as a customer’s credit worthiness, intent and ability to pay, and overall financial position. If the data the Company uses to calculate the allowance for doubtful accounts does not reflect the future ability to collect outstanding receivables, additional provisions for doubtful accounts may be needed and its results of operations could be materially affected.

CASH AND CASH EQUIVALENTS

The Company’s cash and cash equivalents primarily consist of cash money market funds where the underlying securities primarily consist of United States treasury obligations, United States agency obligations, and repurchase agreements collateralized by United States Government and agency obligations with maturities of 90 days or less.

RESTRICTED CASH

Restricted cash is primarily used to collateralize the Company’s open letters of credit.

INVESTMENTS

The Company’s investment is classified as available for sale and consists of an auction rate security (“ARS”).

FINANCIAL INSTRUMENTS

The carrying value of cash and cash equivalents, accounts receivable, other current assets, accounts payable, short-term debt and accrued liabilities approximates fair value due to short-term maturities of these assets and liabilities. Fair values of long-term debt and investments are based on quoted market prices if available, and if not available a fair value is determined through a discounted cash flow analysis at the date of measurement.

INVENTORY

Inventories are stated at the lower of cost, determined on a first-in, first-out basis, or market. Each quarter, the Company estimates and establishes reserves for excess, obsolete or unmarketable inventory. These reserves are generally equal to the historical cost basis of the excess or obsolete inventory and once recorded are considered permanent adjustments. Calculation of the reserves requires management to use judgment and make assumptions about forecasted demand in relation to the inventory on hand, competitiveness of its product offerings, general market conditions and product life cycles upon which the reserves are based. When inventory on hand exceeds foreseeable demand (generally in excess of twelve months), reserves are established for the value of such inventory that is not expected to be sold.

If actual demand and market conditions are less favorable than those the Company projects, additional inventory reserves may be required and its results of operations could be materially affected. Some or all of the inventories that have been reserved may be retained and made available for sale; however, they are generally scrapped over time.

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment are carried at cost less accumulated depreciation and amortization. Depreciation is calculated using the straight-line method. Significant renewals and betterments are capitalized and equipment taken out of service is written off. Maintenance and repairs, as well as renewals of a minor amount, are expensed as incurred.

Estimated useful lives used for depreciation purposes are five to 30 years for buildings and improvements and three to 10 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

Definite lived intangible assets are carried at cost less accumulated amortization. Amortization is calculated on a straight-line basis over the estimated useful lives of the assets. Carrying values for long-lived assets and definite lived intangible assets, which exclude goodwill, 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 / asset group values are deemed to be unrecoverable relative to future undiscounted cash flows expected to be generated by that particular asset / asset group. The determination of recoverability is based on an estimate of undiscounted cash flows expected to result from the use of an asset / 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 (excluding interest) is less than the carrying value of an asset/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 or asset group.

GOODWILL AND INTANGIBLE ASSETS

Goodwill and intangible assets with indefinite useful lives are not amortized but are tested at least annually for impairment in accordance with the provisions of FASB ASC 350 Intangibles-Goodwill and Other (“ASC 350”). Intangible assets with indefinite useful lives comprise an insignificant portion of the total book value of the Company’s goodwill and intangible assets. The Company assesses the need to test its goodwill for impairment on a regular basis. Pursuant to the guidance provided under Segment Reporting (see Note 18 of Item 8 of this Annual Report on Form 10-K for further discussion), the Company has determined that it has only one reporting unit for the purposes of allocating and testing goodwill under ASC 350.

The goodwill impairment test is a two-step process. The first step of the Company’s impairment analysis compares its fair value to its net book value to determine if there is an indicator of impairment. To determine fair value, ASC 350 allows for the use of several valuation methodologies, although it states that quoted market prices are the best evidence of fair value and shall be used as the basis for measuring fair value where available. In the Company’s assessment of its fair value, the Company considers the closing price of its common stock on the selected testing date, the number of shares of its common stock outstanding during such period and other marketplace activity and related control premiums. If the calculated fair value is determined to be less than the book value of the Company, then the Company performs step two of the impairment analysis. Step two of the analysis compares the implied fair value of the Company’s goodwill to the book value of its goodwill. If the book value of the Company’s goodwill exceeds the implied fair value of its goodwill, an impairment loss is recognized equal to that excess. In step two of the Company’s annual impairment analysis, the Company primarily uses the income approach methodology of valuation, which includes the discounted cash flow method as well as other generally accepted valuation methodologies, to determine the implied fair value of the Company’s goodwill. Significant management judgment is required in preparing the forecasts of future operating results that are used in the discounted cash flow method of valuation. Should step two of the impairment test be required, the estimates management would use would be consistent with the plans and estimates that the Company uses to manage its business. In addition to testing goodwill for impairment on an annual basis, factors such as unexpected adverse business conditions, deterioration of the economic climate, unanticipated technological changes, adverse changes in the competitive environment, loss of key personnel and acts by governments and courts, are considered by management and may signal that the Company’s intangible assets have become impaired and result in additional interim impairment testing.

In fiscal year 2011, the Company performed an impairment test of its goodwill as of the first day of the fourth fiscal quarter in accordance with the Company’s regularly scheduled annual testing. The results of this test indicated that none of the Company’s goodwill was impaired based on step one of the test; accordingly step two of the test was not performed.

SHARE-BASED COMPENSATION

The Company applies ASC 718 Compensation-Stock Compensation (“ASC 718”) which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and directors including employee stock options, employee stock purchases related to the Company’s 2002 Employee Stock Purchase Plan, restricted stock and other special share-based awards based on estimated fair values. The Company adopted ASC 718 using the modified prospective transition method, which requires the application of the applicable accounting standard as of October 1, 2005, the first day of the Company’s fiscal year 2006.

The fair value of stock-based 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. Due to the existence of both performance and service conditions, certain restricted stock grants are expensed over the service period for each separately vesting tranche.

Share-based compensation expense recognized during the period is based on the value of the portion of share-based payment awards that is ultimately expected to vest during the period. Share-based compensation expense recognized in the Company’s Consolidated Statement of Operations for the fiscal year ended September 30, 2011 only included share-based payment awards granted subsequent to September 30, 2005 based on the grant date fair value estimated in accordance with the provisions of ASC 718. As share-based compensation expense recognized in the Consolidated Statement of Operations for the fiscal year ended September 30, 2011 is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

Upon adoption of ASC 718, the Company elected to retain its method of valuation for share-based awards using the Black-Scholes option-pricing model (“Black-Scholes model”) which was also previously used for the Company’s pro forma information required under the previous authoritative literature governing stock compensation expense. The Company’s determination of fair value of share-based payment awards on the date of grant using the Black-Scholes model is affected by the Company’s stock price as well as assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to; the Company’s expected stock price volatility over the term of the awards, and actual and projected employee stock option exercise behaviors. The determination of fair value of restricted share awards is based on the value of the Company's stock on the date of grant. For more complex awards with market-based performance conditions, the Company employs a Monte Carlo simulation method which calculates many potential outcomes for an award and establishes fair value based on the most likely outcome.

DEFERRED FINANCING COSTS

Financing costs are capitalized as an asset on the Company’s balance sheet and amortized on a straight-line basis over the life of the financing. If debt is extinguished early, a proportionate amount of deferred financing costs is charged to earnings.

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 or decrease the carrying value of goodwill 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 significant 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. With the implementation effective September 29, 2007, ASC 740 - Income Taxes ("ASC 740") clarifies the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements in accordance with GAAP. ASC 740 prescribes a recognition threshold and measurement attribute for 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.

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 Company records the minimum estimated liability related to the claim. As additional information becomes available, the Company assesses the potential liability related to the Company's pending loss contingency and revises its estimates. The Company's costs, including legal costs are recorded to expense as incurred.

ACCUMULATED OTHER COMPREHENSIVE LOSS

The Company accounts for comprehensive loss in accordance with the provisions of ASC 220 - Comprehensive Income (“ASC 220”). ASC 220 is a financial statement presentation standard that requires the Company to disclose non-owner changes included in equity but not included in net income or loss. Accumulated other comprehensive loss presented in the financial statements consists of adjustments to the Company’s auction rate securities and minimum pension liability as follows (in thousands):



	Pension Adjustments			Auction Rate Securities Adjustment			Accumulated Other Comprehensive Loss
Balance as of October 2, 2009	$	(468	)	$	(912	)	$	(1,380	)
Pension adjustment	83			—			83
Balance as of October 1, 2010	$	(385	)	$	(912	)	$	(1,297	)
Pension adjustment	(34		)	—			(34		)
Balance as of September 30, 2011	$	(419	)	$	(912	)	$	(1,331	)

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

In December 2010, the FASB issued Accounting Standards Update (“ASU”) -2010-29 Business Combinations which addresses the diversity in practice about the interpretations of the pro forma revenue and earnings disclosure requirements for business combinations. This update requires public entities that present comparative financial statements to disclose revenue and earnings of the combined entity as though the business combination(s) that occurred during the year had occurred as of the beginning of the comparable prior annual reporting period only. The amendment also expands the supplemental pro forma disclosures to include a description of the nature and amount of material, nonrecurring pro forma adjustments that are included in the pro forma revenue and earnings. This guidance is effective on a prospective basis for business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning after December 15, 2010. The Company elected to early adopt this standard and it did not have a material impact on its financial position or results of operations.

In December 2010 and September 2011, the FASB issued ASU 2010-28 and ASU 2011-08 Intangibles - Goodwill and Other, respectively, which both modify the annual goodwill impairment testing procedures. ASU 2010-28 focuses on the carrying amount of goodwill for purposes of performing step one of the goodwill test and ASU 2011-08 focuses on allowing entities the ability to first assess the qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. Both of these updates are effective for annual and interim reporting periods beginning after December 15, 2011 and early adoption is permitted. ASU 2010-28 requires retrospective application. The Company elected not to early adopt either of these updates and does not expect the adoption will have a material impact on its goodwill impairment calculation, financial position or results of operations.

In May 2011, the FASB issued ASU-2011-04 Fair Value Measurement that modifies the fair value measurements and disclosure requirements in U.S. GAAP and IFRS. This newly issued accounting standard clarifies the application of certain existing fair value measurement guidance and expands the disclosures for fair value measurements that are estimated using significant unobservable inputs. This guidance is effective on a prospective basis for annual and interim reporting periods beginning after December 15, 2011. The Company does not expect that adoption of this standard will have a material impact on its financial position or results of operations.

In June 2011, the FASB issued ASU 2011-05 Statement of Comprehensive Income which (1) eliminates the option to present the components of other comprehensive income as part of the statement of changes in stockholders' equity; (2) requires the consecutive presentation of the statement of net income and other comprehensive income; and (3) requires an entity to present reclassification adjustments on the face of the financial statements from other comprehensive income to net income. The FASB is currently considering deferral of the third requirement under this ASU but has not made a decision regarding the outcome as of the date of this annual report. This amendment does not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income nor does this amendment affect how earnings per share is calculated or presented. This guidance is required to be applied retrospectively and is effective for fiscal years and interim periods beginning after December 15, 2011. The Company does not expect that adoption of this standard will have a material impact on its financial position or results of operations.

Business Combinations

12 Months Ended

Sep. 30, 2011

Business Combinations [Abstract]

Acquisitions

BUSINESS COMBINATIONS

On April 27, 2011, the Company acquired 100% ownership of a private company engaged in the design and manufacturing of optical components for $28.8 million (net of cash acquired and including an estimated fair value of $2.0 million of contingent consideration which is not materially different than the maximum earn-out level). The acquisition has an immaterial impact to the Company’s results of operations (i.e., contributed less than one percent of net revenue for the fiscal year ended September 30, 2011) and accordingly, the disclosures required per the business combination topic of the Accounting Standards Codification have been excluded from this annual report on Form 10-K. Although the purchase price allocation is preliminary, the Company has recognized assets primarily related to intellectual property, land, building and goodwill.

On June 10, 2011, the Company completed the acquisition of SiGe Semiconductor, Inc. (“SiGe”), a semiconductor provider. The Company acquired a 100% ownership interest in SiGe for an aggregate purchase price of $278.9 million in cash, including contingent consideration, payable in cash, approximately one year from the acquisition date, with an estimated fair value of $57.4 million. The possible outcome of the contingent consideration ranges from zero to $65.0 million and is based on the achievement of a specified revenue target over the twelve month period following the date of the acquisition. SiGe is a leading global supplier of RF front-end solutions that facilitate wireless multimedia across a wide range of applications. The acquisition of SiGe complements the Company’s leadership in wide area front-end solutions by adding SiGe's innovative short range, silicon-based products. As a result, the Company now offers customers a more comprehensive wireless networking product portfolio, supporting all key operating frequencies with greater architectural flexibility to address a variety of high growth applications.

The allocation of purchase price consideration in the Company’s acquisition of SiGe to the assets and liabilities was not finalized at the time of filing this annual report on Form 10-K due to the proximity of the acquisition date of June 10, 2011 to the end of the fiscal year, September 30, 2011. The Company has, however, completed a preliminary purchase price allocation and accordingly, the Company has reflected a preliminary allocation of the purchase price in the accompanying financial statements. The preliminary allocation of the purchase price was based upon estimates and assumptions which are subject to change within the measurement period (up to one year from the acquisition date). The preliminary allocation of the purchase price is based on the estimated fair values of the assets acquired and liabilities assumed by major class related to the SiGe acquisition and are reflected in the accompanying financial statements as follows (in thousands):



	June 10, 2011
Estimated fair value of assets acquired
Cash and cash equivalents	$	6,689
Receivables, net	14,176
Inventory	17,457
Other current assets	2,942
Property, plant and equipment	3,551
Deferred tax assets, net	20,648
Intangible assets	74,270
Goodwill	162,387
Total assets acquired	302,120
Estimated fair value of liabilities assumed
Total liabilities assumed	(23,188		)
Net assets acquired	$	278,932

The allocation of purchase price is considered preliminary until the end of the measurement period. However, during the fiscal year ended September 30, 2011, the Company recorded adjustments to its purchase accounting for SiGe as reported during the third fiscal quarter. The Company reduced the total consideration paid as a result of a net working capital adjustment and recorded additional deferred tax assets. Both of these adjustments resulted in a reduction of goodwill as of September 30, 2011.

The preliminary amount of purchase price allocated to goodwill of $162.4 million relates to revenue and cost synergies the Company expects to capitalize on as a result of the business combination. Substantially all of the goodwill recognized as a result of the SiGe acquisition is not expected to be deductible for tax purposes.

The preliminary amount of the purchase price allocated to identified intangible assets recognized in the acquisition of SiGe and the respective estimated useful lives as of June 10, 2011 were as follows (in thousands):



	Fair Value		Weighted Average Amortization Period (in Years)
Intellectual property	$	36,660	5
Customer relationships	26,200		5
In-process research and development	4,510		TBD
Backlog	3,900		0.3
Trademark	3,000		5
Total identifiable intangible assets	$	74,270

Intellectual property primarily represents the fair value of the SiGe product technologies (including patents) acquired. Customer relationships represent the fair value of the underlying relationships and agreements with SiGe customers. In-process research and development represents the fair value of incomplete SiGe research and development projects that had not reached technological feasibility as of the acquisition date, June 10, 2011. Because of the uncertainty related to the completion of these projects, the Company has determined that the amortization period will be established when the projects are completed. If a project is determined to be cancelled or does not meet technological feasibility, the value associated with that project will be written off in the period the determination is made. Backlog represents the fair value of SiGe unfilled orders as of the acquisition date, June 10, 2011. The trademark represents the brand and name recognition associated with the marketing of SiGe products and was determined to have a finite life. The Company used a combination of income approaches to assess the preliminary fair values of the intangible assets and as a result, considers the fair value of these acquired assets to be Level 3 assets due to the significant assumptions used in the valuation. See Note 5, Fair Value for the definition of Level 3 assets.

Net revenue and net income for acquisitions completed during the fiscal year ended September 30, 2011 have been included in the consolidated statements of operations from their respective acquisition dates. SiGe contributed approximately $39.7 million of net revenue to the consolidated results of operations for the fiscal year ended September 30, 2011. The impact of SiGe's ongoing operations on the Company’s net income was insignificant to the fiscal year ended September 30, 2011. The transaction related costs associated to the SiGe acquisition were considered immaterial and included within selling, general and administrative expense for the fiscal year ended September 30, 2011.

The unaudited pro forma financial results for the fiscal years ended September 30, 2011 and October 1, 2010 combine the unaudited historical results of Skyworks along with the unaudited historical results of SiGe for the fiscal years ended September 30, 2011 and October 1, 2010, respectively. The results include the effects of unaudited pro forma adjustments as if SiGe was acquired on October 3, 2009. There were no material nonrecurring pro forma adjustments in the calculation of revenue or earnings. The pro forma financial results presented below do not include any anticipated synergies or other expected benefits of the acquisition. These results are presented for informational purposes only and are not necessarily indicative of future operations (in thousands, except per share amounts):



	Fiscal Years Ended
	September 30, 2011		October 1, 2010
Revenue	$	1,490,960	$	1,174,057
Net income	$	209,016	$	129,258
Basic EPS	$	1.14	$	0.74
Diluted EPS	$	1.10	$	0.71

Pending acquisition

On May 26, 2011, the Company announced it had entered into an agreement and plan of merger (the “Merger Agreement”) with PowerCo Acquisition Corp., a wholly owned subsidiary of the Company (“Merger Sub”) and Advanced Analogic Technologies Incorporated (“AATI”) pursuant to which the Merger Sub will, subject to the satisfaction or waiver of the conditions in the Merger Agreement, merge with and into AATI, and AATI will survive the merger and become a wholly owned subsidiary of the Company (the “Merger”). Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each outstanding share of AATI common stock (except for shares held directly or indirectly by the Company, Merger Sub, AATI or any wholly owned subsidiary of AATI, and except for shares of AATI common stock held by stockholders exercising dissenter’s rights) will automatically be converted into the right to receive an aggregate of $6.13 per share, payable in the form of 0.08725 of a share of the Company’s common stock (the “stock consideration”) and an adjustable cash amount in the initial calculated amount of $3.68 (the “cash consideration” and, together with the stock consideration, the “merger consideration”), without interest and less applicable withholding taxes. The amount of the stock consideration was based on the average last sale price of Skyworks common stock (at the 4 p.m. Eastern Time end of Nasdaq regular trading hours) over the 30-trading days prior to May 26, 2011. At that average price, the stock consideration had a nominal value of $2.45 and the nominal aggregate combined value of the cash consideration and the stock consideration was $6.13. The final cash consideration will depend on the closing value of the stock consideration, calculated on the basis of Skyworks’ average reported last sale price in regular Nasdaq trading during a five-trading-day measurement period preceding the closing of the merger. If the closing value of the stock consideration is less than $2.45, the cash consideration will increase by the amount of the shortfall. If the closing value of the stock consideration is more than $2.45, the cash consideration will decrease by the amount of the excess. If the closing value of the stock consideration is exactly $2.45, the cash consideration will remain unchanged at $3.68. In each case, the merger consideration will maintain a constant nominal aggregate combined value of $6.13 per share of AATI common stock. If the Company’s average last reported sale price during the pre-closing measurement period is less than $21.00 per share, the Company has the right to pay the entire $6.13 in cash, and in that event, AATI stockholders would not receive any shares of the Company’s Common Stock in the merger for their outstanding shares of AATI common stock, and would instead receive $6.13 entirely in cash. In the event that the Company's stock price is below $21.00 per share on the date of acquisition and elects an all cash transaction, the Company expects to pay approximately $190.0 million to $200.0 million in cash net of approximately $80.0 million to $90.0 million of cash expected to be acquired in the transaction. For additional information regarding the pending acquisition, see Note 14, Contingencies.

Marketable Securities	12 Months Ended
Marketable Securities	Sep. 30, 2011
Marketable Securities [Abstract]
Marketable Securities	MARKETABLE SECURITIES The Company accounts for its investment in marketable securities in accordance with ASC 320-Investments-Debt and Equity Securities ("ASC 320"), and classifies them as “available for sale”. At September 30, 2011, these securities consisted of $3.2 million par value in ARS, with a carrying value of $2.3 million. The difference between the par value and the carrying value is categorized as a temporary loss in other comprehensive income. The Company receives the scheduled interest payments in accordance with the terms of the ARS. The Company closely monitors and evaluates the appropriate accounting treatment in each reporting period for the ARS.

Contingencies	12 Months Ended
Contingencies	Sep. 30, 2011
CONTINGENCIES [Abstract]
Contingencies Disclosure [Text Block]	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, product liability, safety and health, employment and contractual matters. Additionally, the semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights. From time to time, third parties have asserted, and may assert in the future, patent, copyright, trademark and other intellectual property rights to technologies that are important to the Company's business and have demanded, and may demand in the future, 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 is also involved in legal proceedings in the ordinary course of business. On May 26, 2011, the Company announced it had entered into an agreement and plan of merger (the “Merger Agreement”) with PowerCo Acquisition Corp., a wholly owned subsidiary of the Company (“Merger Sub”) and AATI pursuant to which the Merger Sub will, subject to the satisfaction or waiver of the conditions in the Merger Agreement, merge with and into AATI, and AATI will survive the merger and become a wholly owned subsidiary of the Company (the “Merger”). Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each outstanding share of AATI common stock (except for shares held directly or indirectly by the Company, Merger Sub, AATI or any wholly owned subsidiary of AATI, and except for shares of AATI common stock held by stockholders exercising dissenter’s rights) will automatically be converted into the right to receive an aggregate of $6.13 per share. Skyworks and AATI are parties to an arbitration proceeding, in which Skyworks is seeking to be released from its obligations to proceed with the transactions contemplated by the Merger Agreement and AATI is seeking to require Skyworks to consummate the transactions contemplated by the Merger Agreement. Skyworks' petition, filed on September 26, 2011 and thereafter amended, asserts claims against AATI for breach of Sections 5.1, 5.1(k), 5.1(n), 6.2 and 6.4 of the Merger Agreement and claims based on misrepresentations by AATI to Skyworks dating to before the signing of the Merger Agreement, and seeks an order (a) declaring that Skyworks is relieved of its obligations under the Merger Agreement, (b) declaring that Skyworks is entitled to terminate the Merger Agreement, and (c) in the alternative, awarding damages in an amount to be proven at final hearing. AATI's petition, filed by AATI on September 23, 2011, asserts claims against Skyworks for breach of the Merger Agreement and seeks (x) a declaratory judgment from the Court (i) that AATI has not breached the merger agreement, (ii) that no “material adverse effect” has occurred with respect to AATI, and (iii) that Skyworks has breached its obligations under the Merger Agreement, (y) an order of specific performance of the Merger Agreement compelling Skyworks to close the merger, and (z) in the alternative, damages in an amount to be proven at final hearing. The petitions have been consolidated for all purposes of the arbitration proceedings, and the hearing is currently scheduled to take place in the last week of November and the first week of December 2011. Under Delaware law, applicable stipulations and orders, and the applicable provisions of the Merger Agreement, the arbitration proceedings are confidential, subject to the parties' disclosure obligations under federal securities law and other applicable laws. Skyworks is unable to predict the outcome of the proceedings. On June 6, 2011, a putative stockholder class action lawsuit was filed in California Superior Court in Santa Clara County (Case No. 111CV202403) (the "Bushansky action") naming AATI, the members of AATI's board of directors, the Company and Merger Sub as defendants. The complaint alleges, among other things, (1) that the members of AATI's board of directors breached their fiduciary duties by (a) failing to take steps to maximize the value of the merger consideration to AATI's stockholders, (b) taking steps to avoid competitive bidding, and (c) failing to protect against conflicts of interest resulting from change-of-control and transaction-related benefits received by AATI directors in connection with the merger that are not available to all stockholders, and (2) that AATI, the members of AATI's board of directors, the Company and Merger Sub aided and abetted these purported breaches of fiduciary duties. The complaint seeks to enjoin consummation of the merger or, if the merger is completed, to recover damages caused by the alleged breaches of fiduciary duties. The complaint also seeks recovery of attorney's fees and costs of the lawsuit. On June 7, 2011, a putative stockholder class action lawsuit was filed in California Superior Court in Santa Clara County (Case No. 111CV202501) (the "Venette action") naming AATI, the members of AATI's board of directors, the Company and Merger Sub as defendants. Plaintiffs filed an amended complaint on July 14, 2011 (the "Amended Complaint"). The Amended Complaint alleges, among other things, (1) that the members of AATI's board of directors breached their fiduciary duties by (a) agreeing to the merger for inadequate consideration on unfair terms, (b) failing to protect against conflicts of interest resulting from change-of-control and transaction-related benefits received by AATI directors in connection with the merger that are not available to all stockholders, (c) selling the company in response to alleged pressure from Dialectic Capital Partners, LP ("Dialectic"), (d) taking steps to avoid competitive bidding (including the entry by certain AATI officers and directors into agreements with the Company relating to voting commitments and inclusion in the merger agreement of nonsolicitation provisions and a termination fee), and (e) by causing the issuance of a materially misleading Form S-4 Registration Statement which, inter alia, purportedly fails to disclose material facts surrounding (i) Dialectic's impact on the proposed merger process, (ii) the AATI board of directors' evaluation of the Company and its offer for AATI, and (iii) supporting figures and analysis regarding the fairness opinion that the AATI Board obtained from its financial advisor, Needham & Company, LLC, in connection with the transaction and (2) that AATI, the members of AATI's board of directors, the Company and Merger Sub aided and abetted these purported breaches of fiduciary duties. The Amended Complaint seeks to enjoin consummation of the merger, and to have the court direct the defendants to implement procedures and processes to maximize shareholder value. The Amended Complaint also seeks recovery of attorney's fees and costs of the lawsuit. On July 26, 2011, the Court issued an order consolidating the Bushansky action and Venette action into a single, consolidated action captioned In re Advanced Analogic Technologies Inc. Shareholder Litigation, Lead Case No. 111CV202403, and designating the Amended Complaint as the operative complaint in the litigation. The Company believes that the claims in the consolidated action are without merit and intends to defend against such claims vigorously. The Company believes there are no other litigation pending that will have, individually or in the aggregate, a material adverse effect on its business

Guarantees and Indemnities	12 Months Ended
Guarantees and Indemnities	Sep. 30, 2011
GUARANTEES AND INDEMNITIES [Abstract]
Guarantees [Text Block]	GUARANTEES AND INDEMNITIES The Company has made no 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 condition or results of operations.

Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended		12 Months Ended
	Sep. 30, 2011 weeks	Oct. 01, 2010 weeks	Oct. 02, 2009 years	Sep. 30, 2011 Building and Building Improvements [Member]	Sep. 30, 2011 Machinery and Equipment [Member]	Sep. 30, 2011 Accumulated Other Comprehensive Income (Loss) [Member]	Oct. 01, 2010 Accumulated Other Comprehensive Income (Loss) [Member]	Oct. 02, 2009 Accumulated Other Comprehensive Income (Loss) [Member]	Oct. 01, 2010 Accumulated Defined Benefit Plans Adjustment [Member]	Sep. 30, 2011 Accumulated Defined Benefit Plans Adjustment [Member]
Maturity Number of Days	90 days
Property, Plant and Equipment, Useful Life, Minimum				5	3
Property, Plant and Equipment, Useful Life, Maximum				30	10
Fiscal Period Number Of Weeks	52	52	52
Accumulated Other Comprehensive Loss Rollforward [Roll Forward]
Pension Adjustments, Beginning Balance									$ (468)	$ (419)
Auction Rate Securities Adjustment, Beginning Balance	(912)	(912)
Accumulated Other Comprehensive Loss, Beginning Balance	(1,297)	(1,380)
Penison adjustment									83
Pension adjustment	34	(83)	200			34	(83)	200
Pension adjustment	(34)	83	(200)			(34)	83	(200)
Pension Adjustments, Ending Balance									(385)	(419)
Auction Rate Securities Adjustment, Ending Balance	(912)	(912)	(912)
Accumulated Other Comprehensive Loss, Ending Balance	$ (1,331)	$ (1,297)	$ (1,380)

Business Combinations (Narrative) (Details) (USD $)			4 Months Ended		4 Months Ended	12 Months Ended
Business Combinations (Narrative) (Details) (USD $)	Jun. 10, 2011	Apr. 27, 2011	Sep. 30, 2011 SiGe [Member]	Jun. 10, 2011 SiGe [Member]	Sep. 30, 2011 AATI [Member]	Sep. 30, 2011 AATI [Member]	Sep. 30, 2011 AATI [Member] Maximum [Member]	Sep. 30, 2011 AATI [Member] Minimum [Member]
Percentage of interest acquired		100.00%		100.00%
Aggregated purchase price		$ 28,800,000		$ 278,900,000
Fair value of contingent consideration		2,000,000		57,400,000
Business combination, contingent consideration arrangements, range of outcomes, value, high			65,000,000
Business combination, contingent consideration arrangements, range of outcomes, value, low			0
Amount contributed to net income by acquired entity			39,700,000
Goodwill	162,387,000
Potential payment for pending acquisition in cash and stock, price per share					6.13	6.13
Expected payment for business acquisitions							200,000,000	190,000,000
Expected cash to be received from pending acquisition							90,000,000	80,000,000
Stock consideration right to receive, share amount					0.08725	0.08725
Closing value of the stock consideration					$ 2.45
Merger consideration right to receive, initial calculated amount without interest					$ 3.68	$ 3.68
Conditional last reported sale price during the pre-closing measurement period, price per share						$ 21.00

Business Combinations Acquisitions (Schedule Of Preliminary Allocation Of Purchase Price To Estimated Fair Value Of Net Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 10, 2011
Business Acquisition [Line Items]
Cash and cash equivalents	$ 6,689
Receivables, net	14,176
Inventory	17,457
Other current assets	2,942
Property, plant and equipment	3,551
Deferred tax assets, net	20,648
Intangible assets	74,270
Goodwill	162,387
Total assets acquired	302,120
Total liabilities assumed	(23,188)
Net assets acquired	$ 278,932

Business Combinations Acquisitions (Schedule Of Acquired Finite-Lived And Indefinite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jun. 10, 2011
Total identifiable intangible assets	$ 74,270
June 10,2011 Intellectual Property [Member]
Acquired Finite-lived Intangible Asset, Amount	36,660
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	5
June 10,2011 Customer Relationship [Member]
Acquired Finite-lived Intangible Asset, Amount	26,200
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	5
June 10,2011 In Process Research & Development [Member]
Acquired Finite-lived Intangible Asset, Amount	4,510
June 10, 2011 Backlog [Member]
Acquired Finite-lived Intangible Asset, Amount	3,900
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	0.3
June 10, 2011 Trademark [Member]
Acquired Indefinite-lived Intangible Asset, Amount	$ 3,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	5

Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011
Par value, auction rate securities	$ 3.2
Carrying value, auction rate securities	$ 2.3

Fair Value (Schedule Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Apr. 27, 2011
Auction rate securities	$ 2,300
Contingent consideration liability recorded for business combinations		2,000
Fair Value, Measurements, Recurring [Member]
Money market	329,417
Auction rate securities	2,288
Total	331,705
Contingent consideration liability recorded for business combinations	59,400
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Money market	329,417
Auction rate securities	0
Total	329,417
Contingent consideration liability recorded for business combinations	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Money market	0
Auction rate securities	0
Total	0
Contingent consideration liability recorded for business combinations	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Money market	0
Auction rate securities	2,288
Total	2,288
Contingent consideration liability recorded for business combinations	$ 59,400

Inventory (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Oct. 01, 2010
Inventory, Net [Abstract]
Raw materials	$ 18,565	$ 16,108
Work in process	92,601	74,701
Finished goods	73,633	20,209
Finished goods on consignment at customers	13,384	14,041
Total inventory	$ 198,183	$ 125,059

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Oct. 01, 2010
Property, Plant and Equipment [Line Items]
Land and improvements	$ 11,024	$ 10,082
Buildings and improvements	53,397	47,734
Furniture and fixtures	26,325	24,784
Machinery and equipment	568,563	455,157
Construction in progress	13,929	28,901
Total property, plant and equipment, gross	673,238	566,658
Accumulated depreciation and amortization	(421,873)	(362,295)
Total property, plant and equipment, net	$ 251,365	$ 204,363

Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Amortized intangible assets, Gross Carrying Amount	$ 132,066	$ 41,626
Amortized intangible assets, Accumulated Amortization	(49,127)	(32,386)
Amortized intangible assets, Net Carrying Amount	82,939	9,240
Total intangible assets, Gross Carrying Amount	135,935	44,895
Total intangible assets, Accumulated Amortization	(49,127)	(32,386)
Total intangible assets, Net Carrying Amount	86,808	12,509
Developed Technology [Member]
Amortized intangible assets, Weighted Average Amortization Period Remaining (Years)	1.9
Amortized intangible assets, Gross Carrying Amount	20,660	14,150
Amortized intangible assets, Accumulated Amortization	(13,751)	(10,862)
Amortized intangible assets, Net Carrying Amount	6,909	3,288
Customer Relationships [Member]
Amortized intangible assets, Weighted Average Amortization Period Remaining (Years)	3.6
Amortized intangible assets, Gross Carrying Amount	57,510	21,510
Amortized intangible assets, Accumulated Amortization	(21,828)	(15,894)
Amortized intangible assets, Net Carrying Amount	35,682	5,616
Patents and Other [Member]
Amortized intangible assets, Weighted Average Amortization Period Remaining (Years)	4.0
Amortized intangible assets, Gross Carrying Amount	53,896	5,966
Amortized intangible assets, Accumulated Amortization	(13,548)	(5,630)
Amortized intangible assets, Net Carrying Amount	40,348	336
Trademarks [Member]
Indefinite-Lived Trademarks	3,869	3,269
Nonamortizing intangible assets, Gross Carrying Amount	3,869	3,269
Total intangible assets, Accumulated Amortization	$ 0	$ 0

Goodwill And Intangible Assets (Schedule Of Changes In Gross Carrying Amount Of Goodwill And Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Goodwill and Intangible Assets Gross Total, Beginning Balance	$ 530,482	$ 527,388
Goodwill and Intangible Assets Acquired During Period	268,569	3,131
Goodwill and Intangible Assets Deductions During The Period	(75)	(37)
Goodwill and Intangible Assets Gross Total, Ending Balance	798,976	530,482
Developed Technology [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	14,150	13,750
Goodwill and Intangible Assets Acquired During Period	6,510	400
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	20,660	14,150
Customer Relationships [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	21,510	21,510
Goodwill and Intangible Assets Acquired During Period	36,000	0
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	57,510	21,510
Patents and Other [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	5,966	5,966
Goodwill and Intangible Assets Acquired During Period	47,930	0
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	53,896	5,966
Trademarks [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	3,269	3,269
Goodwill and Intangible Assets Acquired During Period	600	0
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	3,869	3,269
Goodwill [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	485,587	482,893
Goodwill and Intangible Assets Acquired During Period	177,529	2,731
Goodwill and Intangible Assets Deductions During The Period	(75)	(37)
Goodwill and Intangible Assets Gross Total, Ending Balance	$ 663,041	$ 485,587

Goodwill And Intangible Assets (Schedule Of Expected Annual Amortization Expense Related To Intangible Assets For The Next Five Years) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization expense, 2012	$ 25,599
Amortization expense, 2013	19,810
Amortization expense, 2014	15,211
Amortization expense, 2015	13,172
Amortization expense, 2016	$ 9,147

Borrowing Arrangements (Narrative) (Details) (USD $)	12 Months Ended
Borrowing Arrangements (Narrative) (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009	Mar. 02, 2007
Principal amount of convertible subordinated notes issued				$ 200,000,000
Debt Offering Number of Tranches				2
Non convertible borrowing rate for estimating fair value	6.86%	6.86%
Convertible Notes Payable	26,089,000	24,743,000
Gains (Losses) on Extinguishment of Debt	0	(79,000)	4,590,000
Principal amount of the convertible notes	26,677,000	26,677,000
Fair value of equity component	6,061,000	6,061,000
Amortized Period, in months	6.0
Long-term debt consists of convertible notes	0	24,743,000
Termination of credit facility	50,000,000	0	0
Short-term debt	26,089,000	50,000,000
Convertible Subordinated Notes 1.25% due March 2010 [Member]
Principal amount of convertible subordinated notes issued				100,000,000
Percentage of convertible subordinated notes				1.25%
Convertible debt Premium Paid Upon Retirement		15,100,000
Extinguishment of Debt, Amount		32,600,000
Convertible Subordinated Notes 1.50% Due March 2012 [Member]
Principal amount of convertible subordinated notes issued				100,000,000
Debt instrument actual if converted value	50,300,000
Non convertible borrowing rate for estimating fair value	6.86%
Percentage of convertible subordinated notes				1.50%
Convertible debt Premium Paid Upon Retirement		12,400,000
Extinguishment of Debt, Amount		20,400,000
Conversion price of the 1.50% Notes per $1000 of principal amount	$ 105.0696
Conversion price	$ 9.52
Principal amount of the convertible notes			77,300,000
Fair value of equity component			22,700,000
Stock price to calculate if converted value	$ 17.96
If-converted value of the remaining Notes exceeds the related principal amount by	$ 23,600,000
Number of shares underlying the remaining 1.50% Notes	2,800,000	2,802,206

Borrowing Arrangements (Schedule Additional Information About The Company's 1.50% Notes) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Oct. 01, 2010
Debt Instrument [Line Items]
Equity component of the convertible notes outstanding	$ 6,061	$ 6,061
Principal amount of the convertible notes	26,677	26,677
Unamortized discount of the liability component	588	1,934
Net carrying amount of the liability component	$ 26,089	$ 24,743

Borrowing Arrangements (Schedule Of Additional Information Regarding Interest Expenses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Debt Disclosure [Abstract]
Effective interest rate on the liability component	6.86%	6.86%
Cash interest expense recognized (contractual interest)	$ 400	$ 734
Effective interest expense recognized	$ 1,345	$ 2,502

Income Taxes Deferred tax assets and liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Oct. 01, 2010
Current: [Abstract]
Inventory	$ 4,181	$ 4,451
Bad debts	162	427
Accrued compensation and benefits	3,946	2,536
Product returns, allowances and warranty	1,222	572
Restructuring	515	794
Other - net	998	943
Current deferred tax assets	11,024	9,723
Less valuation allowance	(2,431)	(2,130)
Net current deferred tax assets	8,593	7,593
Long-term: [Abstract]
Intangible assets	7,660	9,422
Retirement benefits and deferred compensation	27,921	21,327
Net operating loss carry forwards	22,143	6,120
Federal tax credits	37,717	28,243
State investement credits	26,111	24,173
Long-term deferred tax assets	121,552	89,285
Less valuation allowance	(36,943)	(23,480)
Net long-term deferred tax assets	84,609	65,805
Deferred tax assets	132,576	99,008
Less valuation allowance	(39,374)	(25,610)
Net deferred tax assets	93,202	73,398
Deferred Tax Liabilities [Abstract]
Prepaid insurance	(723)	(724)
Current deferred tax liabilities	(723)	(724)
Property, plant and equipment	(18,084)	(4,636)
Other - net	(208)	(272)
Intangible assets	(5,943)	(329)
Long-term deferred tax liabilities	(24,235)	(5,237)
Net deferred tax liabilities	24,958	5,961
Total deferred tax assets	$ 68,244	$ 67,437

Income Taxes Changes in unrecognized tax benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Beginning Balance	$ 19,900
Increase based on positions related to prior years	935
Increases based on positions related to current year	11,334
Decreases relating to settlements with taxing authorities	0
Decreases relating to lapses of applicable statues of limitations	(33)
Unrecognized Tax Benefits, Ending Balance	$ 32,136

Income Taxes Narrative (Details) (USD $)	12 Months Ended
Income Taxes Narrative (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 500,000
Income Tax Credits and Adjustments	6,200,000
Income Tax Reconciliation, Nondeductible Expense, Restructuring Charges	0	(3,468,000)	0
Income Tax Reconciliation Nondeductible Restructuring Charges Benefit		6,300,000
Income Tax Reconciliation Nondeductible Restructuring Charges Provision		2,800,000
Valuation Allowance, Amount	39,400,000
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense	11,600,000
Tax benefit to recognize if valuation allowance is reversed	39,000,000
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Goodwill	400,000
Deferred Tax Assets, Tax Credit Carryforwards	180,200,000
Unrecognized Tax Benefits, Period Increase (Decrease)		1,000,000
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	2,152,000	2,834,000	(39,089,000)
Change in deferred tax asset valuation allowance in additioan paid in capital		3,800,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	60,500,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	1,300,000
Tax Credit Carryforward, Amount	80,100,000
Valuation Allowance Not Recognized	23,000,000
Deferred Tax Liabilities, Undistributed Foreign Earnings	147,000,000
Unrecognized Tax Benefits	32,136,000	19,900,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	19,700,000
Foreign Country [Member]
Valuation Allowance, Amount	13,300,000
Deferred Tax Asset Change Due To Change In Legislation	(1,100,000)
State and Local Jurisdiction [Member]
Valuation Allowance, Amount	26,100,000
Deferred Tax Asset Change Due To Change In Legislation	(800,000)
Other Tax Carryforward, SiGe Acquisition [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 43,300,000

Stockholders' Equity Common and perferred shares (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010
Class of Stock [Line Items]
Common Stock, Shares, Issued	195,407,396	185,683,000
Common Stock, Shares, Outstanding	186,386,197	180,263,000
Common Stock, Shares Authorized	525,000,000	525,000,000
Common Stock, Par or Stated Value Per Share	$ 0.25	$ 0.25
Preferred Stock, Shares Authorized	25,000,000	25,000,000

Stockholders' Equity Stock Repurchase (Details) (USD $)	12 Months Ended
Stockholders' Equity Stock Repurchase (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009	Aug. 30, 2010
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				200,000,000
Payments for Repurchase of Common Stock	$ 70,043,000	$ 0	$ 0
Treasury Stock, Shares, Acquired	2,768,045
Stock Repurchase Program Average Price Per Share	$ 25.30
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 130,000,000

Employee Benefit Plans, Pensions, and Other Retiree Benefits 401(k) Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 years	Oct. 01, 2010	Oct. 02, 2009
Defined Benefit Plan Disclosure [Line Items]
Minimum Age Requirement	21
Contribution percentage of employee earnings to retirement plan	4.00%
Contribution Of Common Shares To Savings And Retirement Plans shares	0.2	0.3	0.7
Contribution Of Common Shares To Savings And Retirement Plans	$ 5.5	$ 4.8	$ 4.6

Employee Benefit Plans, Pensions, and Other Retiree Benefits Defined Benefit Pension Benefits (Details) (USD $)	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Defined Benefit Plan, Net Periodic Benefit Cost	$ 100,000	$ 100,000
Pension Plans, Defined Benefit [Member]
Benefit obligation at end of fiscal year	2,955,000	3,035,000
Fair value of plan assets at end of fiscal year	2,536,000	2,650,000
Funded status	$ (419,000)	$ (385,000)

Commitments Rent exepense (Details) (USD $)	12 Months Ended
Commitments Rent exepense (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Component of Other Expense, Nonoperating [Line Items]
Operating Leases, Rent Expense	$ 7,600,000	$ 7,600,000	$ 8,000,000
Operating Leases, Future Minimum Payments Due [Abstract]
2012	8,247,000
2013	7,149,000
2014	6,671,000
2015	5,896,000
2016	3,883,000
Thereafter	5,942,000
Operating Leases, Future Minimum Payments Due	37,788,000
Other commitments due in one year	3,400,000
Other commitments due in two yeara	$ 1,800,000

Restructuring (Narrative) (Details) (USD $)	12 Months Ended
Restructuring (Narrative) (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Restructuring Charges	$ 2,363,000	$ (1,040,000)	$ 15,982,000
Restructuring Reserve	2,028,000	2,189,000	3,279,000
Payments for Restructuring	(2,852,000)	(1,541,000)	(5,934,000)
Inventory Write-down	0	0	3,458,000
Asset Impairment Charges	0	0	5,616,000
Other Restructuring Costs	328,000	451,000	(198,000)
2011 restructuring and other charges [Member]
Restructuring Charges	2,400,000
Restructuring Reserve	2,600,000
Payments for Restructuring	2,200,000
2009 restructure and other charges [Member]
Restructuring Charges			16,000,000
Payments for Restructuring	700,000
Restructuring and Related Cost, Number of Positions Eliminated			150
Inventory Write-down			3,500,000
Severance Costs			4,500,000
Asset Impairment Charges			5,600,000
Business Exit Costs			2,100,000
Other Asset Impairment Charges			2,300,000
Other Restructuring Costs			$ 1,500,000

Segment Information Geographic Revenue (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jul. 01, 2011	Apr. 01, 2011	Dec. 31, 2010	Oct. 01, 2010	Jul. 02, 2010	Apr. 02, 2010	Jan. 01, 2010	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Revenue, Net	$ 402,316	$ 356,075	$ 325,411	$ 335,120	$ 313,283	$ 275,370	$ 238,058	$ 245,138	$ 1,418,922	$ 1,071,849	$ 802,577
Property, Plant and Equipment, Net	251,365				204,363				251,365	204,363
Total Americas [Member]
Revenue, Net									115,627	152,334	102,513
United States
Revenue, Net									76,764	115,610	76,435
Property, Plant and Equipment, Net	114,492				104,846				114,492	104,846
Other Americas [Member]
Revenue, Net									38,863	36,724	26,078
Segment, Geographical, Groups of Countries, Group Two [Member]
Revenue, Net									1,248,322	855,891	660,493
China
Revenue, Net									914,678	628,858	414,208
South Korea
Revenue, Net									148,370	144,758	174,744
Taiwan
Revenue, Net									93,753	51,353	48,443
Other Asia-Pacific [Member]
Revenue, Net									91,521	30,922	23,098
Europe, Middle East and Africa [Member]
Revenue, Net									54,973	63,624	39,571
Mexico
Property, Plant and Equipment, Net	131,862				98,667				131,862	98,667
Other [Member]
Property, Plant and Equipment, Net	$ 5,011				$ 850				$ 5,011	$ 850

Segment Information Concentration (Details)	12 Months Ended
Segment Information Concentration (Details)	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Company A [Member] \| Customer One [Member]
Revenue from major customers percentage	27.00%
Company A [Member] \| Customer Two [Member]
Revenue from major customers percentage		13.00%
Company B [Member] \| Customer Two [Member]
Revenue from major customers percentage	13.00%
Company B [Member] \| Customer Three [Member]
Revenue from major customers percentage		12.00%
Company C [Member] \| Customer One [Member]
Revenue from major customers percentage		13.00%	15.00%
Company C [Member] \| Customer Three [Member]
Revenue from major customers percentage	11.00%
Company D [Member] \| Customer Two [Member]
Revenue from major customers percentage			12.00%
Company E [Member] \| Customer Three [Member]
Revenue from major customers percentage			11.00%
Credit Concentration Risk [Member]
Accounts Receivable From Major Customers Percentage	53.00%	60.00%	34.00%