Document and Entity Information (USD $)	6 Months Ended
Document and Entity Information (USD $)	Apr. 01, 2011	Apr. 29, 2011	Apr. 02, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	SKYWORKS SOLUTIONS INC
Entity Central Index Key	0000004127
Document Type	10-Q
Document Period End Date	Apr. 01, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
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			$ 2,716,065,796
Entity Common Stock, Shares Outstanding		186,187,121

Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 01, 2011	Apr. 02, 2010	Apr. 01, 2011	Apr. 02, 2010
Consolidated Statements of Operations
Net revenue	$ 325,411	$ 238,058	$ 660,531	$ 483,196
Cost of goods sold	184,430	138,204	371,012	280,788
Gross profit	140,981	99,854	289,519	202,408
Operating expenses:
Research and development	39,618	32,060	78,161	63,849
Selling, general and administrative	31,665	27,982	62,716	54,713
Amortization of intangibles	1,638	1,500	3,240	3,001
Total operating expenses	72,921	61,542	144,117	121,563
Operating income	68,060	38,312	145,402	80,845
Interest expense	(461)	(1,183)	(998)	(2,752)
Loss on early retirement of convertible debt		(73)		(124)
Other loss, net	(114)	(208)	(183)	(319)
Income before income taxes	67,485	36,848	144,221	77,650
Provision for income taxes	17,525	9,104	33,393	21,896
Net income	$ 49,960	$ 27,744	$ 110,828	$ 55,754
Earnings per share:
Basic	$ 0.27	$ 0.16	$ 0.61	$ 0.32
Diluted	$ 0.26	$ 0.15	$ 0.58	$ 0.31
Weighted average shares:
Basic	183,471	174,449	182,088	173,583
Diluted	191,961	182,924	190,251	181,164

Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 01, 2011	Oct. 01, 2010
Current assets:
Cash and cash equivalents	$ 503,801	$ 453,257
Restricted cash	662	6,128
Receivables, net of allowance for doubtful accounts of $1,165 and $1,177,respectively	183,352	175,232
Inventories	151,179	125,059
Other current assets	33,450	30,189
Total current assets	872,444	789,865
Property, plant and equipment, net	241,733	204,363
Goodwill	485,543	485,587
Intangible assets, net	13,519	12,509
Deferred tax assets, net	55,330	60,569
Other assets	10,228	11,159
Total assets	1,678,797	1,564,052
Current liabilities:
Short-term debt	25,405	50,000
Accounts payable	111,949	111,967
Accrued compensation and benefits	32,892	35,695
Other current liabilities	6,198	6,662
Total current liabilities	176,444	204,324
Long-term debt, less current maturities	0	24,743
Other long-term liabilities	25,961	18,389
Total liabilities	202,405	247,456
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, no par value: 25,000 shares authorized, no shares issued	0	0
Common stock, $0.25 par value: 525,000 shares authorized; 193,668 shares issued and 185,944 shares outstanding at April 1, 2011 and 185,683 shares issued and 180,263 shares outstanding at October 1, 2010	46,486	45,066
Additional paid-in capital	1,749,299	1,641,406
Treasury stock, at cost	(101,064)	(40,719)
Accumulated deficit	(217,032)	(327,860)
Accumulated other comprehensive loss	(1,297)	(1,297)
Total stockholders' equity	1,476,392	1,316,596
Total liabilities and stockholders' equity	$ 1,678,797	$ 1,564,052

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 01, 2011	Oct. 01, 2010
Current assets:
Allowance for doubtful accounts	$ 1,165	$ 1,177
Stockholders' equity:
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.25	$ 0.25
Common stock, shares authorized	525,000	525,000
Common stock, shares issued	193,668	185,683
Common stock, shares outstanding	185,944	180,263

Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 01, 2011	Apr. 02, 2010
Cash flows from operating activities:
Net income	$ 110,828	$ 55,754
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	28,145	16,804
Depreciation	27,882	22,250
Amortization of intangible assets	3,240	3,001
Amortization of discount and deferred financing costs on convertible debt	705	1,836
Contribution of common shares to savings and retirement plans	6,638	5,600
Deferred income taxes	5,205	12,430
Excess tax benefit from share-based payments	(10,887)
Loss on disposals of assets	28	96
Provision for losses (recoveries) on accounts receivable	(12)	260
Changes in assets and liabilities:
Receivables	(8,108)	7,105
Inventories	(25,308)	(18,366)
Other current and long-term assets	2,986	(2,118)
Accounts payable	(18)	7,499
Other current and long-term liabilities	15,721	1,026
Net cash provided by operating activities	157,045	113,177
Cash flows from investing activities:
Capital expenditures	(65,280)	(34,260)
Payments for acquisitions	(4,456)	(1,000)
Net cash used in investing activities	(69,736)	(35,260)
Cash flows from financing activities:
Retirement of 2007 Convertible Notes		(32,477)
Reacquisition of equity component of 2007 Convertible Notes		(15,148)
Payments on short term line of credit	(50,000)
Excess tax benefit from share-based payments	10,887
Change in restricted cash	5,466	(265)
Repurchase of common stock - payroll tax withholdings	(18,780)	(3,574)
Repurchase of common stock - share repurchase program	(41,564)
Proceeds from exercise of stock options	57,226	14,736
Net cash used in financing activities	(36,765)	(36,728)
Net increase in cash and cash equivalents	50,544	41,189
Cash and cash equivalents at beginning of period	453,257	364,221
Cash and cash equivalents at end of period	503,801	405,410
Supplemental cash flow disclosures:
Taxes paid	9,844	11,518
Interest paid	$ 263	$ 669

Description of Business and Basis of Presentation	6 Months Ended
Description of Business and Basis of Presentation	Apr. 01, 2011
Description of Business and Basis of Presentation [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 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, detectors, diodes, directional couplers, front-end modules, hybrids, infrastructure RF subsystems, mixers/demodulators, phase shifters, PLLs/synthesizers/VCOs, power dividers/combiners, receivers, switches and technical ceramics. The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. Certain information and footnote disclosures, normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), have been condensed or omitted pursuant to those rules and regulations. However, in the opinion of management, the financial information reflects all adjustments, consisting of adjustments of a normal recurring nature necessary to present fairly the financial position, results of operations, and cash flows of the Company for the periods presented. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. This information should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Form 10-K for the fiscal year ended October 1, 2010 as filed with the SEC. 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 fair value of marketable securities in inactive markets as well as determining when declines in fair value constitute an other-than-temporary impairment. In addition, significant judgment is required in determining whether a potential indicator of impairment of our long-lived assets exists and in estimating future cash flows for any necessary impairment tests. Management’s estimates are based on historical experience and actual results could differ significantly. The Company has evaluated subsequent events through the date of issuance of these unaudited consolidated financial statements. The Company’s fiscal year ends each year on the Friday closest to September 30. Fiscal 2011 consists of 52 weeks and ends on September 30, 2011. Fiscal 2010 consisted of 52 weeks and ended on October 1, 2010. The second quarters of fiscal 2011 and fiscal 2010 each consisted of 13 weeks and ended on April 1, 2011 and April 2, 2010, respectively.

- Definition

Description containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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Financial Instruments

6 Months Ended

Apr. 01, 2011

Financial Instruments [Abstract]

FINANCIAL INSTRUMENTS

3. FINANCIAL INSTRUMENTS

In accordance with ASC 820 — Fair Value Measurements and Disclosure (“ASC 820”), the Company groups its financial assets and liabilities measured at fair value on a recurring basis in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are:

•

Level 1 — Valuation is based upon quoted market price for identical instruments traded in active markets.

•

Level 2 — Valuation is based on quoted market prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.

•

Level 3 — Valuation is generated from model-based techniques that use significant assumptions not observable in the market. Valuation techniques include use of discounted cash flow models and similar techniques.

The Company has cash equivalents classified as Level 1 and has no Level 2 securities. The Company’s ARS, discussed in Note 2, Marketable Securities, are classified as Level 3 assets. There have been no transfers between Level 1, Level 2 or Level 3 assets during the three and six-months ended April 1, 2011. There have been no purchases, sales, issuances or settlements of the marketable securities classified as Level 3 assets during the three and six-months ended April 1, 2011.

Financial Instruments Measured at Fair Value on a Recurring Basis

The following table presents the balances of cash equivalents and marketable securities measured at fair value on a recurring basis as of April 1, 2011 (in thousands):


			Fair Value Measurements
			Quoted Prices in
			Active Markets for		Significant Other		Significant
			Identical Assets		Observable Inputs		Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Money market/repurchase agreements	$	479,305	$	479,305	$	—	$	—
Auction rate securities		2,288		—		—		2,288

Total	$	481,593	$	479,305	$	—	$	2,288

Non-Financial Assets Measured at Fair Value on a Nonrecurring Basis

The Company’s non-financial assets, such as goodwill, intangible assets, and other long lived assets resulting from business combinations are measured at fair value at the date of acquisition and subsequently re-measured if there is an indicator of impairment or annually as in the case of goodwill or trademarks. There were no indicators of impairment identified during the three and six-months ended April 1, 2011.

- Definition

This item represents the complete disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, 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 Company 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 risk is 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.

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Inventories

6 Months Ended

Apr. 01, 2011

Inventories [Abstract]

INVENTORIES

4. INVENTORIES

Inventories consist of the following (in thousands):


	As of
	April 1,		October 1,
	2011		2010
Raw materials	$	12,578	$	16,108
Work in process		75,448		74,701
Finished goods		49,162		20,209
Finished goods on consignment by customers		13,991		14,041

Total inventories	$	151,179	$	125,059

Property Plant and Equipment

6 Months Ended

Apr. 01, 2011

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

5. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consist of the following (in thousands):


	As of
	April 1,			October 1,
	2011			2010
Land and improvements	$	10,082		$	10,082
Buildings and improvements		48,034			47,734
Furniture and fixtures		24,777			24,784
Machinery and equipment		497,197			455,157
Construction in progress		47,531			28,901

Total property, plant and equipment, gross		627,621			566,658
Accumulated depreciation and amortization		(385,888	)		(362,295	)

Total property, plant and equipment, net	$	241,733		$	204,363

Goodwill and Intangible Assets

6 Months Ended

Apr. 01, 2011

Goodwill and Intangible Assets [Abstract]

GOODWILL AND INTANGIBLE ASSETS

6. GOODWILL AND INTANGIBLE ASSETS

Goodwill and intangible assets consist of the following (in thousands):


	Weighted
	Average
	Amortization		As of							As of
	Period		April 1, 2011							October 1, 2010
	Remaining		Gross Carrying		Accumulated			Net Carrying		Gross Carrying		Accumulated			Net Carrying
	(Years)		Amount		Amortization			Amount		Amount		Amortization			Amount
Goodwill			$	485,543	$	—		$	485,543	$	485,587	$	—		$	485,587

Amortized intangible assets
Developed technology		1.8	$	16,150	$	(12,176	)	$	3,974	$	14,150	$	(10,862	)	$	3,288
Customer relationships		1.4		21,510		(17,380	)		4,130		21,510		(15,894	)		5,616
Patents and other		2.4		8,216		(6,070	)		2,146		5,966		(5,630	)		336

				45,876		(35,626	)		10,250		41,626		(32,386	)		9,240

Nonamortizing intangible assets
Trademarks				3,269		—			3,269		3,269		—			3,269

Total intangible assets			$	49,145	$	(35,626	)	$	13,519	$	44,895	$	(32,386	)	$	12,509

Amortization expense related to intangible assets was $1.6 million and $3.2 million for the three and six-months ended April 1, 2011, respectively. Amortization expense was $1.5 million and $3.0 million for the three and six-months ended April 2, 2010, respectively.

The changes in the gross carrying amount of goodwill and intangible assets are as follows (in thousands):


	Goodwill and Intangible Assets
				Developed		Customer		Patents and
	Goodwill			Technology		Relationships		Other		Trademarks		Total
Balance as of October 1, 2010	$	485,587		$	14,150	$	21,510	$	5,966	$	3,269	$	530,482
Additions (deductions) during period		(44	)		2,000		—		2,250		—		4,206

Balance as of April 1, 2011	$	485,543		$	16,150	$	21,510	$	8,216	$	3,269	$	534,688

The Company tests its goodwill and trademarks for impairment annually as of the first day of its fourth fiscal quarter and in interim periods if certain events occur indicating that the carrying value of goodwill may be impaired. There were no indicators of impairment noted during the three and six-months ended April 1, 2011.

Annual amortization expense related to intangible assets for the next five years is expected to be as follows (in thousands):


	Remaining
	FY 2011		FY 2012		FY 2013		FY 2014		FY 2015
Amortization expense	$	3,278	$	5,371	$	1,532	$	69	$	—

- Definition

Discloses the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain or loss on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. This element may be used as a single block of text to include the entire intangible asset disclosure including data and tables.

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Borrowing Arrangements

6 Months Ended

Apr. 01, 2011

Borrowing Arrangements [Abstract]

BORROWING ARRANGEMENTS

7. BORROWING ARRANGEMENTS

Long-Term Debt

On March 2, 2007, the Company issued $200.0 million aggregate principal amount of convertible subordinated notes (“2007 Convertible Notes”). The offering contained two tranches. The first tranche consisted of $100.0 million of 1.25% convertible subordinated notes due March 2010 (the “1.25% Notes”) which have been retired. The second tranche consisted of $100.0 million aggregate principal amount of 1.50% convertible subordinated notes due March 2012 (the “1.50% Notes”). As of April 1, 2011, $26.7 million in aggregate principal amount of 1.50% Notes remained outstanding. The Company pays interest in cash semi-annually in arrears on March 1 and September 1 of each year on the 1.50% Notes. The conversion price of the 1.50% Notes is 105.0696 shares per $1,000 principal amount of notes to be redeemed, which is the equivalent of a conversion price of approximately $9.52 per share, plus accrued and unpaid interest, if any, to the conversion date. Holders of the remaining of the $26.7 aggregate principal balance of the 1.50% Notes may require the Company to repurchase the 1.50% Notes upon a change in control of the Company.

Holders may convert the 1.50% Notes at any time on or prior to the close of business on the final maturity date. If a holder of a 1.50% Note elects to convert such Notes at maturity, the Company may continue to choose to deliver to the holder either cash, shares of its common stock or a combination of cash and shares of its common stock to settle the conversion. This cash settlement provision permits the application of the treasury stock method in determining potential share dilution of the conversion spread should the share price of the Company’s common stock exceed $9.52. It has been the Company’s historical practice to cash settle the principal and interest components of convertible debt instruments, and it is the Company’s intention to continue to do so in the future, including with respect to the 1.50% Notes.

As of April 1, 2011, the $25.4 million carrying value of the 1.50% Notes was deemed a current liability and accordingly was reclassified as short-term debt. Long-term debt consists of convertible notes with a carrying value of $24.7 million as of October 1, 2010. As of April 1, 2011, based on a stock price of $31.45, the actual “if converted” value of the remaining 1.50% Notes was $88.1 million which exceeds the related principal amount by approximately $61.4 million.

On October 3, 2009, the Company adopted ASC 470-20 — Debt, Debt with Conversions and Other Options (“ASC 470-20”). ASC 470-20 applies to the Company’s 2007 Convertible Notes. Using a non-convertible borrowing rate of 6.86%, the Company estimated the fair value of the liability component of the $100.0 million aggregate principal amount of the 1.50% Notes to be $77.3 million on October 3, 2009. As of the issuance date, the difference between the fair value of the liability component of the 1.50% Notes and the corresponding aggregate principal amount of such notes, which is equal to the fair value of the equity component of the 1.50% Notes ($22.7 million), was retrospectively recorded as a debt discount and as an increase to additional paid-in capital, net of tax. The discount of the liability component of the 1.50% Notes is being amortized over the remaining life of the instrument.

The following tables provide additional information about the Company’s 1.50% Notes (in thousands):


	As of
	April 1,		October 1,
	2011		2010
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		1,272		1,934
Net carrying amount of the liability component		25,405		24,743


	Three-months Ended						Six-months Ended
	April 1,			April 2,			April 1,			April 2,
	2011			2010			2011			2010
Effective interest rate on the liability component		6.86	%		6.86	%		6.86	%		6.86	%
Cash interest expense recognized (contractual interest)	$	100		$	234		$	200		$	513
Effective interest expense recognized	$	333		$	713		$	661		$	1,702

The remaining unamortized discount on the 1.50% Notes will be amortized over the next eleven months. As of both April 1, 2011 and October 1, 2010, the number of shares underlying the remaining 1.50% Notes was 2.8 million.

Short-Term Debt

As of April 1, 2011, the $25.4 million carrying value of the 1.50% Notes was deemed a current liability and accordingly was reclassified as short-term debt.

On July 15, 2003, the Company entered into a receivables purchase agreement under which it agreed to sell from time to time certain of its accounts receivable to Skyworks USA, Inc. (“Skyworks USA”), a wholly-owned special purpose entity that is consolidated for accounting purposes. Concurrently, Skyworks USA entered into an agreement with Wachovia Bank, N.A. providing for a $50.0 million credit facility (the “Credit Facility”) secured by the purchased accounts receivable. The Company’s short-term debt balance as of October 1, 2010 was $50.0 million. The Company paid down the entire $50.0 million balance and terminated the Credit Facility and all associated agreements during the first quarter of fiscal 2011.

Income Taxes	6 Months Ended
Income Taxes	Apr. 01, 2011
Income Taxes [Abstract]
INCOME TAXES	8. INCOME TAXES The Company recorded income tax provisions of $17.5 million and $33.4 million for the three and six-months ended April 1, 2011, respectively, and $9.1 million and $21.9 million for the three and six-months ended April 2, 2010, respectively. The provision for income taxes for the three and six-months ended April 1, 2011 consisted of $16.4 million and $31.7 million of United States income taxes, respectively, and $8.8 million and $21.3 million for the three and six-months ended April 2, 2010, respectively. The provision for income taxes for the three and six-months ended April 1, 2011 consisted of $1.1 million and $1.7 million of foreign income taxes, respectively, and $0.3 million and $0.6 million for the three and six-months ended April 2, 2010, respectively. For the three and six-months ended April 1, 2011, the difference between the Company’s effective tax rate and the 35% U.S. federal statutory rate resulted primarily from foreign earnings taxed at rates lower than the federal statutory rate and the recognition of research and development tax credits earned. In December 2010, the United States Congress enacted legislation to retroactively extend the federal research and development tax credit. As a result, the Company recognized $4.8 million of federal research and development tax credits in the six-months ended April 1, 2011, which were earned in the fiscal year ended October 1, 2010. For the three and six-months ended April 2, 2010, the difference between the Company’s effective tax rate and the 35% federal statutory rate resulted primarily from foreign earnings taxed at rates lower than the United States federal statutory rate, and the change in assessment as to reinvestment of earnings to United States deferred taxes related to the transfer of assets to an affiliated foreign company. 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, 2020. The tax holiday is conditional upon the Company’s compliance in meeting certain employment and investment thresholds in Singapore. In accordance with ASC 740 — Income Taxes (“ASC 740”), 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. Accordingly, as of April 1, 2011, the Company has maintained a valuation allowance of $24.0 million related to the Company’s United States deferred tax assets, primarily related to the Company’s state tax research and experimentation credits. Deferred tax assets have been recognized for foreign operations when management believes that it is more likely than not that they will be recovered during the carryforward period. We have also previously determined that it is more likely than not that a portion of the Company’s foreign income tax benefits will not be realized and maintain a valuation allowance of $1.6 million related to the Company’s foreign deferred tax assets. Realization of benefits from the Company’s deferred tax asset, net of valuation allowance is dependent upon generating United States source taxable income in the future. The existing valuation allowance could be reversed in the future to the extent that the related deferred tax assets no longer require a valuation allowance under the provisions of ASC 740. The Company will continue to evaluate its valuation allowance in future periods and depending upon the outcome of that assessment, additional amounts could be reversed or recorded and recognized as an adjustment to income tax benefit or expense. Such adjustments could cause our effective income tax rate to vary in future periods. The Company will need to generate $138.4 million of United States federal taxable income in future years to utilize all of the Company’s net operating loss carryforwards, research and experimentation tax credit carryforwards, and deferred income tax temporary differences, net of valuation allowance as of April 1, 2011. During the quarter ended April 1, 2011, there was an increase in the Company’s gross unrecognized tax benefits of $1.4 million. The Company’s gross unrecognized tax benefits totaled $23.8 million as of April 1, 2011. Of the total unrecognized tax benefits at April 1, 2011, $14.9 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 which were required to be deferred. There are no positions which we anticipate could change within the next twelve months. The Company did not incur significant interest or penalties related to unrecognized tax benefits during the quarter ended April 1, 2011. The Company’s policy is to recognize accrued interest and penalties, if incurred, on any unrecognized tax benefits as a component of income tax expense. The Company’s major tax jurisdictions as of April 1, 2011 are the United States federal jurisdiction, and the United States jurisdictions of California and Iowa. For the United States, the Company has open tax years dating back to fiscal year 1998 due to the carry forward of tax attributes. For California and Iowa, the Company has open tax years dating back to fiscal year 2002 due to the carry forward of tax attributes.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Apr. 01, 2011
Commitments and Contingencies [Abstract]
COMMITMENTS AND CONTINGENCIES	9. 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, 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 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 is also involved in legal proceedings in the ordinary course of business. The Company believes there is no litigation pending that will have, individually or in the aggregate, a material adverse effect on its business. Guarantees and Indemnifications 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.

Segment Information	6 Months Ended
Segment Information	Apr. 01, 2011
Segment Information [Abstract]
SEGMENT INFORMATION	10. SEGMENT INFORMATION In accordance with ASC 280-Segment Reporting (“ASC 280”), the Company has one reportable operating segment which designs, develops, manufactures and markets proprietary semiconductor products, including intellectual property. ASC 280 establishes standards for the way public business enterprises report information about operating segments in annual financial statements and in interim reports to shareholders. The method for determining what information to report is based on management’s use of financial information for the purposes of assessing performance and making operating decisions. In evaluating financial performance and making operating decisions, management primarily uses consolidated net revenue, gross profit, operating profit and earnings per share. The Company’s business units share similar economic characteristics, long term business models, research and development expenses and selling, general and administrative expenses. Furthermore, the Company’s chief operating decision makers base operating decisions on consolidated financial information. As of April 1, 2011, there has been no change and the Company continues to consider itself to have one reportable operating segment. The Company will re-assess its conclusions at least annually.

Employee Stock Benefit Plans

6 Months Ended

Apr. 01, 2011

Employee Stock Benefit Plans [Abstract]

EMPLOYEE STOCK BENEFIT PLANS

11. EMPLOYEE STOCK BENEFIT PLANS

Share-based compensation expense consists of expense related to our unvested grants of employee stock options and awards in accordance with ASC 718 — Compensation-Stock Compensation (“ASC 718”).

The following table summarizes share-based compensation expense related to unvested employee stock options, restricted and performance stock grants, management incentive compensation, and our employee stock purchase plan for the three and six-months ended April 1, 2011 and April 2, 2010, as follows:


	Three-months Ended				Six-months Ended
	April 1,		April 2,		April 1,		April 2,
(In thousands)	2011		2010		2011		2010
Stock options	$	4,111	$	3,137	$	7,951	$	6,172
Restricted stock with service and market conditions		—		31		—		689
Restricted stock with service conditions		494		206		963		413
Performance shares		8,426		3,777		15,733		6,644
Management incentive plan stock awards		1,240		1,123		2,284		2,006
Employee stock purchase plan		593		446		1,214		880

Total share-based compensation expense	$	14,864	$	8,720	$	28,145	$	16,804

The Company utilized the following weighted average assumptions in calculating its share-based compensation expense using the Black-Scholes model as of the six-months ended April 1, 2011 and April 2, 2010:


	Six-months Ended
	April 1,			April 2,
	2011			2010
Expected volatility		49.26	%		56.19	%
Risk free interest rate (7 year contractual life options)		1.59	%		2.02	%
Dividend yield		0.00			0.00
Expected option life (7 year contractual life options)		4.10			4.23

Accumulated Other Comprehensive Loss	6 Months Ended
Accumulated Other Comprehensive Loss	Apr. 01, 2011
Accumulated Other Comprehensive Loss [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	12. 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. There were no changes in the value of the auction rate securities or pension liability during the three and six-months ended April 1, 2011.

- Definition

This label may include the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains and losses on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains and losses on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain or loss and net prior service cost or credit for pension plans and other postretirement benefit plans.

+ References+ Details

Common Stock Repurchase	6 Months Ended
Common Stock Repurchase	Apr. 01, 2011
Common Stock Repurchase [Abstract]
Common Stock Repurchase	13. COMMON STOCK REPURCHASE On August 3, 2010 the Board of Directors approved a stock repurchase program, pursuant to which the Company is authorized to repurchase up to $200.0 million of the Company’s common stock from time to time on the open market or in privately negotiated transactions as permitted by securities laws and other legal requirements. During the three-months ended April 1, 2011 the Company paid approximately $23.3 million in connection with the repurchase of 731,645 shares of its common stock (paying an average price of $31.90 per share). During the six-months ended April 1, 2011, the Company paid approximately $41.6 million (including commissions) in connection with the repurchase of 1,518,045 shares of its common stock (paying an average price of $27.37 per share). As of April 1, 2011, $158.5 million remained available under the existing share repurchase authorization.

Earnings Per Share

6 Months Ended

Apr. 01, 2011

Earnings Per Share [Abstract]

EARNINGS PER SHARE

14. EARNINGS PER SHARE


	Three-months Ended						Six-months Ended
	April 1,			April 2,			April 1,			April 2,
(In thousands, except per share amounts)	2011			2010			2011			2010
Net income	$	49,960		$	27,744		$	110,828		$	55,754


Weighted average shares outstanding — basic		183,471			174,449			182,088			173,583
Effect of dilutive convertible debt		1,989			2,169			1,851			2,079
Effect of dilutive share-based awards		6,501			6,306			6,312			5,502

Weighted average shares outstanding — diluted		191,961			182,924			190,251			181,164


Net income per share — basic	$	0.27		$	0.16		$	0.61		$	0.32
Effect of dilutive convertible debt		—			—			(0.01	)		—
Effect of dilutive share-based awards		(0.01	)		(0.01	)		(0.02	)		(0.01	)

Net income per share — diluted	$	0.26		$	0.15		$	0.58		$	0.31

Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share includes the dilutive effect of equity based awards and the 2007 Convertible Notes using the treasury stock method.

Equity based awards exercisable for approximately 0.1 million shares and 5.8 million shares were outstanding but not included in the computation of earnings per share for the three-months ended April 1, 2011 and April 2, 2010, respectively, as their effect would have been anti-dilutive.

Equity based awards exercisable for approximately 0.9 million shares and 5.9 million shares were outstanding but not included in the computation of earnings per share for the six-months ended April 1, 2011 and April 2, 2010, respectively, as their effect would have been anti-dilutive.

The remaining $26.7 million in aggregate principal balance of the 1.50% Notes contains a cash settlement provision, which permits the application of the treasury stock method in determining potential share dilution of the conversion spread should the share price of the Company’s common stock exceed $9.52. For the three and six-months ended April 1, 2011, 2.0 million and 1.9 million shares, respectively, were included in the calculation of diluted earnings per share as a result of this conversion feature and 2.2 million shares and 2.1 million shares for the three and six-months ended April 2, 2010, respectively, were included.

Description of Business and Basis of Presentation (Policies)

6 Months Ended

Apr. 01, 2011

Description of Business and Basis of Presentation (Policies) [Abstract]

ASC 320 Investments in Debt and Equity Security (Available for sale)

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”. As of April 1, 2011, these securities consisted of $3.2 million par value auction rate securities (“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 closely monitors and evaluates the appropriate accounting treatment in each reporting period for the ARS.

ASC 820 Fair Value Measurements and Disclosures

•

Level 1 — Valuation is based upon quoted market price for identical instruments traded in active markets.

•

ASC 470-20-Debt, Debt with Conversions and Other Options

ASC 740-Income Taxes (ASC 740)

In accordance with ASC 740 — Income Taxes (“ASC 740”), 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. Accordingly, as of April 1, 2011, the Company has maintained a valuation allowance of $24.0 million related to the Company’s United States deferred tax assets, primarily related to the Company’s state tax research and experimentation credits. Deferred tax assets have been recognized for foreign operations when management believes that it is more likely than not that they will be recovered during the carryforward period. We have also previously determined that it is more likely than not that a portion of the Company’s foreign income tax benefits will not be realized and maintain a valuation allowance of $1.6 million related to the Company’s foreign deferred tax assets.

ASC 280-Segment Reporting (ASC 280)

In accordance with ASC 280-Segment Reporting (“ASC 280”), the Company has one reportable operating segment which designs, develops, manufactures and markets proprietary semiconductor products, including intellectual property. ASC 280 establishes standards for the way public business enterprises report information about operating segments in annual financial statements and in interim reports to shareholders. The method for determining what information to report is based on management’s use of financial information for the purposes of assessing performance and making operating decisions. In evaluating financial performance and making operating decisions, management primarily uses consolidated net revenue, gross profit, operating profit and earnings per share. The Company’s business units share similar economic characteristics, long term business models, research and development expenses and selling, general and administrative expenses. Furthermore, the Company’s chief operating decision makers base operating decisions on consolidated financial information. As of April 1, 2011, there has been no change and the Company continues to consider itself to have one reportable operating segment. The Company will re-assess its conclusions at least annually.

ASC 718-Compensation Stock Compensation (ASC 718)

ASC 220 - Comprehensive Income (ASC 220)

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. There were no changes in the value of the auction rate securities or pension liability during the three and six-months ended April 1, 2011.

- Definition

Describes an entity's accounting policies for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the description may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.

+ References+ Details

Financial Instruments (Tables)

6 Months Ended

Apr. 01, 2011

Financial Instruments (Tables) [Abstract]

Financial Instruments Measured at Fair Value on Recurring Basis


			Fair Value Measurements
			Quoted Prices in
			Active Markets for		Significant Other		Significant
			Identical Assets		Observable Inputs		Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Money market/repurchase agreements	$	479,305	$	479,305	$	—	$	—
Auction rate securities		2,288		—		—		2,288

Total	$	481,593	$	479,305	$	—	$	2,288

Goodwill and Intangible Assets (Tables)

6 Months Ended

Apr. 01, 2011

Goodwill and Intangible Assets (Tables) [Abstract]

Goodwill and Intangible Assets


	Weighted
	Average
	Amortization		As of							As of
	Period		April 1, 2011							October 1, 2010
	Remaining		Gross Carrying		Accumulated			Net Carrying		Gross Carrying		Accumulated			Net Carrying
	(Years)		Amount		Amortization			Amount		Amount		Amortization			Amount
Goodwill			$	485,543	$	—		$	485,543	$	485,587	$	—		$	485,587

Amortized intangible assets
Developed technology		1.8	$	16,150	$	(12,176	)	$	3,974	$	14,150	$	(10,862	)	$	3,288
Customer relationships		1.4		21,510		(17,380	)		4,130		21,510		(15,894	)		5,616
Patents and other		2.4		8,216		(6,070	)		2,146		5,966		(5,630	)		336

				45,876		(35,626	)		10,250		41,626		(32,386	)		9,240

Nonamortizing intangible assets
Trademarks				3,269		—			3,269		3,269		—			3,269

Total intangible assets			$	49,145	$	(35,626	)	$	13,519	$	44,895	$	(32,386	)	$	12,509

Changes in gross carrying amount of goodwill and intangible assets


	Goodwill and Intangible Assets
				Developed		Customer		Patents and
	Goodwill			Technology		Relationships		Other		Trademarks		Total
Balance as of October 1, 2010	$	485,587		$	14,150	$	21,510	$	5,966	$	3,269	$	530,482
Additions (deductions) during period		(44	)		2,000		—		2,250		—		4,206

Balance as of April 1, 2011	$	485,543		$	16,150	$	21,510	$	8,216	$	3,269	$	534,688

Expected annual amortization expense related to intangible assets for the next five years


	Remaining
	FY 2011		FY 2012		FY 2013		FY 2014		FY 2015
Amortization expense	$	3,278	$	5,371	$	1,532	$	69	$	—

Employee Stock Benefit Plans (Tables)

6 Months Ended

Apr. 01, 2011

Employee Stock Benefit Plans (Tables) [Abstract]

Summary of share-based compensation expense related to employee stock options, restricted stock grants, performance stock grants, employee stock purchases, and management incentive compensation


	Three-months Ended				Six-months Ended
	April 1,		April 2,		April 1,		April 2,
(In thousands)	2011		2010		2011		2010
Stock options	$	4,111	$	3,137	$	7,951	$	6,172
Restricted stock with service and market conditions		—		31		—		689
Restricted stock with service conditions		494		206		963		413
Performance shares		8,426		3,777		15,733		6,644
Management incentive plan stock awards		1,240		1,123		2,284		2,006
Employee stock purchase plan		593		446		1,214		880

Total share-based compensation expense	$	14,864	$	8,720	$	28,145	$	16,804

Weighted average assumptions in calculating its share-based compensation expense


	Six-months Ended
	April 1,			April 2,
	2011			2010
Expected volatility		49.26	%		56.19	%
Risk free interest rate (7 year contractual life options)		1.59	%		2.02	%
Dividend yield		0.00			0.00
Expected option life (7 year contractual life options)		4.10			4.23

Marketable Securities (Details) [Textuals] (Auction Rate Securities [Member], USD $)	Apr. 01, 2011
Auction Rate Securities [Member]
Marketable Securities (Textuals) [Abstract]
Par value of ARS	$ 3,200,000
Carrying value of ARS	$ 2,288,000

- Definition

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income, a separate component of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2011
Financial Instruments Measured at Fair Value on Recurring Basis
Total	$ 481,593
Money Market/Repurchase Agreements [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Money market/repurchase agreements	479,305
Auction Rate Securities [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Auction rate security	2,288
Fair Value, Inputs, Level 1 [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Total	479,305
Fair Value, Inputs, Level 1 [Member] \| Money Market/Repurchase Agreements [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Money market/repurchase agreements	479,305
Fair Value, Inputs, Level 1 [Member] \| Auction Rate Securities [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Auction rate security	0
Fair Value, Inputs, Level 2 [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Total	0
Fair Value, Inputs, Level 2 [Member] \| Money Market/Repurchase Agreements [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Money market/repurchase agreements	0
Fair Value, Inputs, Level 2 [Member] \| Auction Rate Securities [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Auction rate security	0
Fair Value, Inputs, Level 3 [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Total	2,288
Fair Value, Inputs, Level 3 [Member] \| Money Market/Repurchase Agreements [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Money market/repurchase agreements	0
Fair Value, Inputs, Level 3 [Member] \| Auction Rate Securities [Member]
Financial Instruments Measured at Fair Value on Recurring Basis
Auction rate security	$ 2,288

- Definition

+ References+ Details

Inventories (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2011	Oct. 01, 2010
Inventories
Raw materials	$ 12,578	$ 16,108
Work in process	75,448	74,701
Finished goods	49,162	20,209
Finished goods on consignment by customers	13,991	14,041
Total inventories	$ 151,179	$ 125,059

Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2011	Oct. 01, 2010
Property, plant and equipment
Land and improvements	$ 10,082	$ 10,082
Buildings and improvements	48,034	47,734
Furniture and fixtures	24,777	24,784
Machinery and equipment	497,197	455,157
Construction in progress	47,531	28,901
Total property, plant and equipment, gross	627,621	566,658
Accumulated depreciation and amortization	(385,888)	(362,295)
Total property, plant and equipment, net	$ 241,733	$ 204,363

Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 01, 2011	Oct. 01, 2010
Goodwill and intangible assets
Goodwill Gross Carrying Amount	$ 485,543	$ 485,587
Goodwill, Accumulated Amortization	0	0
Goodwill, Net Carrying Amount	485,543	485,587
Total intangible assets, Gross Carrying Amount	49,145	44,895
Total intangible assets, Accumulated Amortization	(35,626)	(32,386)
Total intangible assets, Net Carrying Amount	13,519	12,509
Amortized intangible assets:
Amortized intangible assets, Gross Carrying Amount	45,876	41,626
Amortized intangible assets, Accumulated Amortization	(35,626)	(32,386)
Amortized intangible assets, Net Carrying Amount	10,250	9,240
Trademarks [Member]
Nonamortizing intangible assets
Unamortized intangible assets, Gross Carrying Amount	3,269	3,269
Unamortized intangible assets, Accumulated Amortization	0	0
Unamortized intangible assets, Net Carrying Amount	3,269	3,269
Developed technology [Member]
Amortized intangible assets:
Amortized intangible assets, Weighted Average Amortization Period Remaining (Years)	1.8
Amortized intangible assets, Gross Carrying Amount	16,150	14,150
Amortized intangible assets, Accumulated Amortization	(12,176)	(10,862)
Amortized intangible assets, Net Carrying Amount	3,974	3,288
Customer Relationships [Member]
Amortized intangible assets:
Amortized intangible assets, Weighted Average Amortization Period Remaining (Years)	1.4
Amortized intangible assets, Gross Carrying Amount	21,510	21,510
Amortized intangible assets, Accumulated Amortization	(17,380)	(15,894)
Amortized intangible assets, Net Carrying Amount	4,130	5,616
Patents and other [Member]
Amortized intangible assets:
Amortized intangible assets, Weighted Average Amortization Period Remaining (Years)	2.4
Amortized intangible assets, Gross Carrying Amount	8,216	5,966
Amortized intangible assets, Accumulated Amortization	(6,070)	(5,630)
Amortized intangible assets, Net Carrying Amount	$ 2,146	$ 336

Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 01, 2011	Apr. 01, 2011	Oct. 01, 2010
Changes in gross carrying amount of goodwill and intangible assets
Goodwill, Gross Carrying Amount	$ 485,587	$ 485,543
Goodwill, Additions (deductions) during period	(44)
Amortized intangible assets	41,626	45,876
Total, Additions (deductions) during period	4,206
Goodwill and Intangible Assets Gross Total	534,688		530,482
Trademarks [Member]
Changes in gross carrying amount of goodwill and intangible assets
Unamortized intangible assets	3,269	3,269	3,269
Developed technology [Member]
Changes in gross carrying amount of goodwill and intangible assets
Amortized intangible assets	14,150	16,150
Amortized Intangible Assets, Additions (Deductions) During Period	2,000
Customer Relationships [Member]
Changes in gross carrying amount of goodwill and intangible assets
Amortized intangible assets		21,510	21,510
Patents and other [Member]
Changes in gross carrying amount of goodwill and intangible assets
Amortized intangible assets	5,966	8,216
Amortized Intangible Assets, Additions (Deductions) During Period	$ 2,250

Goodwill and Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 01, 2011
Expected annual amortization expense related to intangible assets for the next five years
Amortization expense, 2011	$ 3,278
Amortization expense, 2012	5,371
Amortization expense, 2013	1,532
Amortization expense, 2014	69
Amortization expense, 2015	$ 0

Borrowing Arrangements (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2011	Oct. 01, 2010
Additional information about the Company's 2007 Convertible Notes
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	1,272	1,934
Net carrying amount of the liability component	$ 25,405	$ 24,743

Borrowing Arrangements (Details1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 01, 2011	Apr. 02, 2010	Apr. 01, 2011	Apr. 02, 2010
Additional information about the Company's 2007 Convertible Notes
Effective interest rate on the liability component	6.86%	6.86%	6.86%	6.86%
Cash interest expense recognized (contractual interest)	$ 100	$ 234	$ 200	$ 513
Effective interest expense recognized	$ 333	$ 713	$ 661	$ 1,702

Borrowing Arrangements (Details Textuals) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended						6 Months Ended
	Apr. 01, 2011	Apr. 02, 2010	Apr. 01, 2011	Apr. 02, 2010	Oct. 01, 2010	Mar. 02, 2007	Jul. 15, 2003	Mar. 02, 2007 Convertible subordinated notes 1.25% due March 2010 [Member]	Apr. 01, 2011 Convertible subordinated notes 1.50% due March 2012 [Member]	Oct. 01, 2010 Convertible subordinated notes 1.50% due March 2012 [Member]	Oct. 02, 2009 Convertible subordinated notes 1.50% due March 2012 [Member]	Mar. 02, 2007 Convertible subordinated notes 1.50% due March 2012 [Member]
Borrowing Arrangements (Textuals) [Abstract]
Long-term debt consists of convertible notes	$ 0		$ 0		$ 24,743,000
Short term debt	25,405,000		25,405,000		50,000,000
Non convertible borrowing rate for estimating fair value	6.86%	6.86%	6.86%	6.86%
Credit Facility							50,000,000
Termination of credit facility	50,000,000		50,000,000
Borrowing Arrangements (Additional) (Textuals) [Abstract]
Principal amount of convertible subordinated notes issued						200,000,000		100,000,000			100,000,000	100,000,000
Debt instrument actual if converted value									88,100,000
Percentage of convertible subordinated notes	1.50%		1.50%					1.25%				1.50%
Conversion price of the 1.50% Notes per $1000 of principal amount									105.0696
Conversion Price	9.52		9.52						9.52
Principal amount of the convertible notes	26,677,000		26,677,000		26,677,000						77,300,000
Fair Value Equity Component	6,061,000		6,061,000		6,061,000						(22,700,000)
Stock price to calculate if converted value									$ 31.45
Amortized Period, in months									11
If-converted value of the remaining Notes exceeds the related principal amount by									$ 61,400,000
Number of shares of the Companys common stock underlying remaining 2007 Convertible Notes									2.8	2.8

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Apr. 01, 2011	Apr. 02, 2010	Apr. 01, 2011	Apr. 02, 2010
Additional Income Taxes (Textuals) [Abstract]
Tax provisions	$ 17,525,000	$ 9,104,000	$ 33,393,000	$ 21,896,000
Income Taxes (Textuals) [Abstract]
Federal statutory rate	35.00%	35.00%
Federal research and development tax credits			4,800,000
Change in gross unrecognized tax benefits	1,400,000
Gross unrecognized tax benefits	23,800,000		23,800,000
Net impact to effective tax rate, if recognized	14,900,000		14,900,000
Expected period for change in tax positions			within the next 12 months
United States [Member]
Additional Income Taxes (Textuals) [Abstract]
Tax provisions	16,400,000	8,800,000	31,700,000	21,300,000
Valuation allowance related to deferred tax assets	24,000,000		24,000,000
Need to generate future taxable income to utilize all of its deferred tax assets	138,400,000		138,400,000
Foreign Country [Member]
Additional Income Taxes (Textuals) [Abstract]
Tax provisions	1,100,000	300,000	1,700,000	600,000
Valuation allowance related to deferred tax assets	$ 1,600,000		$ 1,600,000

Employee Stock Benefit Plans (Details1)	6 Months Ended
Employee Stock Benefit Plans (Details1)	Apr. 01, 2011	Apr. 02, 2010
Weighted average assumptions in calculating its share-based compensation expense
Expected volatility	49.26%	56.19%
Risk free interest rate (7 year contractual life options)	1.59%	2.02%
Dividend yield	0.00%	0.00%
Expected option life (7 year contractual life options)	4.10	4.23

Common Stock Repurchase (Details) (USD $)	3 Months Ended	6 Months Ended
Common Stock Repurchase (Details) (USD $)	Apr. 01, 2011	Apr. 01, 2011	Aug. 03, 2010
Common Stock Repurchase (Textuals) [Abstract]
Value of shares authorized to repurchase under board of directors approved repurchase program			$ 200,000,000
Amount paid in connection with the repurchase	23,300,000	41,564,000
Shares repurchased	731,645	1,518,045
Average price paid per share	$ 31.90	$ 27.37
Amount remained available under the existing share repurchase authorization	$ 158,500,000	$ 158,500,000

Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 01, 2011	Apr. 02, 2010	Apr. 01, 2011	Apr. 02, 2010
Earnings Per Share
Net income	$ 49,960	$ 27,744	$ 110,828	$ 55,754
Weighted average shares outstanding - basic	183,471	174,449	182,088	173,583
Effect of dilutive convertible debt	1,989	2,169	1,851	2,079
Effect of dilutive share-based awards	6,501	6,306	6,312	5,502
Weighted average shares outstanding - diluted	191,961	182,924	190,251	181,164
Net income per share - basic	$ 0.27	$ 0.16	$ 0.61	$ 0.32
Effect of dilutive convertible debt	$ 0.00	$ 0.00	$ (0.01)	$ 0.00
Effect of dilutive share-based awards	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.01)
Diluted	$ 0.26	$ 0.15	$ 0.58	$ 0.31

Earnings Per Share (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
Earnings Per Share (Details Textuals) (USD $)	Apr. 01, 2011	Apr. 02, 2010	Apr. 01, 2011	Apr. 02, 2010	Oct. 01, 2010
Earnings Per Share (Textuals) [Abstract]
Outstanding Exercisable equity based awards	100,000	5,800,000	900,000	5,900,000
Aggregate principal amount of convertible subordinated notes	$ 26,677,000		$ 26,677,000		$ 26,677,000
Percentage of Notes	1.50%		1.50%
Conversion Price	$ 9.52		$ 9.52
Shares included in the calculation of diluted earnings per share	1,989,000	2,169,000	1,851,000	2,079,000

Marketable Securities	6 Months Ended
Marketable Securities	Apr. 01, 2011
Marketable Securities [Abstract]
MARKETABLE SECURITIES	2. 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”. As of April 1, 2011, these securities consisted of $3.2 million par value auction rate securities (“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 closely monitors and evaluates the appropriate accounting treatment in each reporting period for the ARS.