10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended July 3, 201 1

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission File No. 001-06462

TERADYNE, INC.

(Exact name of registrant as specified in its charter)

Massachusetts	04-2272148
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
600 Riverpark Drive, North Reading, Massachusetts	01864
(Address of Principal Executive Offices)	(Zip Code)

978-370-2700

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to the filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files)    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

The number of shares outstanding of the registrant’s only class of Common Stock as of August 8, 2011 was 186,184,101 shares.

TERADYNE, INC.

INDEX

		Page No.
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited):
	Condensed Consolidated Balance Sheets as of July 3, 2011 and December 31, 2010		3
	Condensed Consolidated Statements of Operations for the Three and Six Months Ended July 3, 2011 and July 4, 2010		4
	Condensed Consolidated Statements of Cash Flows for the Six Months Ended July  3, 2011 and July 4, 2010		5
	Notes to Condensed Consolidated Financial Statements		6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		24
Item 3.	Quantitative and Qualitative Disclosures about Market Risk		37
Item 4.	Controls and Procedures		37
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings		38
Item 1A.	Risk Factors		38
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		39
Item 6.	Exhibits		39

2

PART I

Item 1: Financial Statements

TERADYNE, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

	July 3, 2011			December 31, 2010
	(in thousands, except per share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	455,398		$	397,737
Marketable securities		453,942			409,061
Accounts receivable, net of allowance for doubtful accounts of $4,097 and $3,752 at July 3, 2011 and December 31, 2010, respectively		207,823			168,756
Inventories:
Parts		90,964			78,109
Assemblies in process		21,039			16,013
Finished goods		29,515			22,719
		141,518			116,841
Deferred tax assets		22,801			22,730
Prepayments and other current assets		61,946			52,780
Current assets from discontinued operations		—			8,713
Total current assets		1,343,428			1,176,618
Property, plant and equipment, at cost		795,778			773,374
Less: accumulated depreciation		562,346			542,266
Net property, plant and equipment		233,432			231,108
Long-term marketable securities		281,978			248,696
Retirement plan assets		14,456			13,981
Intangible assets, net		108,357			122,941
Other assets		16,644			16,542
Long-term assets from discontinued operations		—			469
Total assets	$	1,998,295		$	1,810,355
LIABILITIES
Current liabilities:
Accounts payable	$	106,993		$	81,142
Accrued employees’ compensation and withholdings		75,018			105,374
Deferred revenue and customer advances		98,723			105,568
Other accrued liabilities		59,889			57,145
Accrued income taxes		9,888			8,465
Current debt		2,475			2,450
Current liabilities from discontinued operations		—			3,560
Total current liabilities		352,986			363,704
Long-term deferred revenue and customer advances		50,064			71,558
Retirement plan liabilities		77,154			72,071
Deferred tax liabilities		9,973			9,849
Long-term other accrued liabilities		19,359			19,448
Long-term debt		154,821			150,182
Long-term liabilities of discontinued operations		—			1,355
Total liabilities		664,357			688,167
Commitments and contingencies (Note O)
SHAREHOLDERS’ EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 186,002 shares and 182,035 shares issued and outstanding at July 3, 2011 and December 31, 2010, respectively		23,250			22,755
Additional paid-in capital		1,292,727			1,269,525
Accumulated other comprehensive loss		(124,094	)		(128,216	)
Retained earnings (accumulated deficit)		142,055			(41,876	)
Total shareholders’ equity		1,333,938			1,122,188
Total liabilities and shareholders’ equity	$	1,998,295		$	1,810,355

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s

Annual Report on Form 10-K for the year ended December 31, 2010, are an integral part of the condensed

consolidated financial statements.

3

TERADYNE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands, except per share amounts)
Net revenues:
Products	$	341,316		$	386,734		$	657,035		$	650,220
Services		69,203			58,537			130,645			114,389
Total net revenues		410,519			445,271			787,680			764,609
Cost of revenues:
Cost of products		159,995			164,421			313,358			285,294
Cost of services		35,438			29,948			66,827			58,537
Total cost of revenues		195,433			194,369			380,185			343,831
Gross profit		215,086			250,902			407,495			420,778
Operating expenses:
Engineering and development		47,393			49,341			95,370			97,278
Selling and administrative		57,481			57,730			115,710			112,417
Acquired intangible asset amortization		7,291			7,313			14,582			14,668
Restructuring and other, net		1,279			371			1,692			1,274
Total operating expenses		113,444			114,755			227,354			225,637
Income from operations		101,642			136,147			180,141			195,141
Interest income		1,403			3,681			2,690			4,523
Interest expense and other		(5,316	)		(7,755	)		(11,492	)		(13,662	)
Income from continuing operations before income taxes		97,729			132,073			171,339			186,002
Income tax provision		7,839			9,543			13,325			14,373
Income from continuing operations		89,890			122,530			158,014			171,629
(Loss) Income from discontinued operations before income taxes		—			(381	)		1,278			620
Income tax benefit		—			—			(267	)		—
(Loss) Income from discontinued operations		—			(381	)		1,545			620
(Loss) Gain on disposal of discontinued operations (net of income tax of $0, $0, $4,578, $0, respectively)		(832	)		—			24,371			—
Net income	$	89,058		$	122,149		$	183,930		$	172,249
Income per common share from continuing operations:
Basic	$	0.48		$	0.68		$	0.85		$	0.97
Diluted	$	0.39		$	0.55		$	0.68		$	0.79
Net income per common share:
Basic	$	0.48		$	0.68		$	0.99		$	0.97
Diluted	$	0.39		$	0.55		$	0.80		$	0.79
Weighted average common share—basic		185,367			179,990			185,044			178,429
Weighted average common share—diluted		230,452			231,541			231,266			228,909

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s

Annual Report on Form 10-K for the year ended December 31, 2010, are an integral part of the condensed

consolidated financial statements.

4

TERADYNE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Six Months Ended
	July 3, 2011			July 4, 2010
	(in thousands)
Cash flows from operating activities:
Net income	$	183,930		$	172,249
Less: income from discontinued operations		1,545			620
Less: gain on disposal of discontinued operations		24,371			—
Income from continuing operations		158,014			171,629
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation		25,645			26,403
Amortization		25,291			23,105
Stock-based compensation		14,682			15,141
Provision for excess and obsolete inventory		6,343			1,454
Tax benefit related to stock options and restricted stock units		(3,717	)		—
Other		1,424			1,659
Changes in operating assets and liabilities, net of businesses sold:
Accounts receivable		(39,067	)		(123,184	)
Inventories		(15,006	)		24,231
Prepayments and other assets		(10,348	)		15,544
Deferred revenue and customer advances		(28,339	)		(62,901	)
Accounts payable and accrued expenses		(9,279	)		52,377
Retirement plan contributions		(5,241	)		(24,677	)
Accrued income taxes		5,406			11,346
Net cash provided by operating activities from continuing operations		125,808			132,127
Net cash (used for) provided by operating activities from discontinued operations		(4,225	)		1,850
Net cash provided by operating activities		121,583			133,977
Cash flows from investing activities:
Purchases of property, plant and equipment		(44,467	)		(35,706	)
Purchases of available-for-sale marketable securities		(498,541	)		(223,820	)
Proceeds from sales and maturities of available-for-sale marketable securities		420,477			47,267
Proceeds from sales of trading marketable securities		—			23,700
Proceeds from life insurance		—			1,091
Net cash used for investing activities from continuing operations		(122,531	)		(187,468	)
Net cash provided by investing activities from discontinued operations		39,062			—
Net cash used for investing activities		(83,469	)		(187,468	)
Cash flows from financing activities:
Issuance of common stock under employee stock option and stock purchase plans		17,052			41,873
Tax benefit related to stock options and restricted stock units		3,717			—
Payments of long-term debt		(1,222	)		(1,123	)
Net cash provided by financing activities		19,547			40,750
Increase (decrease) in cash and cash equivalents		57,661			(12,741	)
Cash and cash equivalents at beginning of period		397,737			416,737
Cash and cash equivalents at end of period	$	455,398		$	403,996

The accompanying notes, together with the Notes to Consolidated Financial Statements included in Teradyne’s

Annual Report on Form 10-K for the year ended December 31, 2010, are an integral part of the condensed

consolidated financial statements.

5

TERADYNE, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

A. The Company

Teradyne, Inc. (“Teradyne”) is a leading global supplier of automatic test equipment. Teradyne’s automatic test equipment products and services include:

• semiconductor test (“Semiconductor Test”) systems; and

• military/aerospace (“Mil/Aero”) test instrumentation and systems, hard disk drive test (“HDD”) systems, and circuit-board test and inspection (“Commercial Board Test”) systems (collectively these products represent “Systems Test Group”).

B. Accounting Policies

Basis of Presentation

The condensed consolidated interim financial statements include the accounts of Teradyne and its subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair presentation of such interim financial statements. Certain prior year’s amounts were reclassified to conform to the current year presentation. The December 31, 2010 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.

The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the SEC on March 1, 2011 for the year ended December 31, 2010.

On March 21, 2011, Teradyne completed the sale of Diagnostic Solutions, its automotive diagnostic and test business unit. The results of operations of Diagnostic Solutions as well as balance sheet and cash flow amounts pertaining to this business have been classified as discontinued operations in the condensed consolidated financial statements (see Note D “Discontinued Operations”).

Preparation of Financial Statements

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts reported in the financial statements. Actual results may differ significantly from these estimates.

C. Recently Issued Accounting Pronouncements

In March 2010, FASB issued an Accounting Standards Update (“ASU”) 2010-17, “Milestone Method of Revenue Recognition”, to Accounting Standards Codification (“ASC”) 605, “Revenue Recognition.” The guidance in this consensus allows the milestone method as an acceptable revenue recognition methodology when an arrangement includes substantive milestones. The guidance provides a definition of substantive milestone and should be applied regardless of whether the arrangement includes single or multiple deliverables or units of accounting. The scope of this consensus is limited to the transactions involving milestones relating to research and development deliverables. The guidance includes enhanced disclosure requirements about each arrangement, individual milestones and related contingent consideration, information about substantive milestones and factors considered in the determination. The consensus is effective prospectively to milestones achieved in fiscal years, and interim periods within those years, after June 15, 2010. Teradyne adopted this final consensus prospectively in January 2011. This adoption had no material impact on Teradyne’s financial position or results of operations.

6

In May 2011, the FASB issued ASU No. 2011-04, “Fair Value Measurement.” This ASU clarifies the concepts related to highest and best use and valuation premise, blockage factors and other premiums and discounts, the fair value measurement of financial instruments held in a portfolio and of those instruments classified as a component of shareowners’ equity. The guidance includes enhanced disclosure requirements about recurring Level 3 fair value measurements, the use of nonfinancial assets, and the level in the fair value hierarchy of assets and liabilities not recorded at fair value. The provisions of this ASU are effective prospectively for interim and annual periods beginning on or after December 15, 2011. Early application is prohibited. This ASU requires changes in presentation only and Teradyne does not expect it will have a material impact on its consolidated financial statements.

In June 2011, the FASB issued ASU No. 2011-05, “Comprehensive Income.” This ASU intends to enhance comparability and transparency of other comprehensive income components. The guidance provides an option to present total comprehensive income, the components of net income and the components of other comprehensive income in a single continuous statement or two separate but consecutive statements. This ASU eliminates the option to present other comprehensive income components as part of the statement of changes in shareowners’ equity. The provisions of this ASU will be applied retrospectively for interim and annual periods beginning after December 15, 2011. Early application is permitted. Teradyne is currently evaluating the impact of this new ASU.

D. Discontinued Operations

On March 21, 2011, Teradyne completed the sale of its Diagnostic Solutions business unit, which was included in the Systems Test Group segment, to SPX Corporation for $40.2 million in cash. Teradyne sold this business as its growth potential as a stand-alone business within Teradyne was significantly less than if it was part of a larger automotive supplier. The financial information for Diagnostic Solutions has been reclassified to discontinued operations for all periods presented. Net revenues and (loss) income from discontinued operations for the three and six months ended July 3, 2011 and July 4, 2010 were as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3,   2011			July 4,   2010			July 3, 2011		July 4, 2010
	(in thousands)
Net revenues	$	—		$	9,505		$	9,086	$	19,790
(Loss) Income from discontinued operations before income taxes	$	—		$	(381	)	$	1,278	$	620
(Loss) Gain from disposal of discontinued operations before income taxes		(832	)		—			28,949		—
Income tax provision		—			—			4,311		—
(Loss) Income from discontinued operations	$	(832	)	$	(381	)	$	25,916	$	620

E. Financial Instruments and Derivatives

Financial Instruments

Teradyne uses the market and income approach to value its financial instruments and there was no change in valuation techniques used by Teradyne during the six months ended July 3, 2011 and July 4, 2010. As defined in ASC 820-10, “Fair Value Measurements and Disclosures”, fair value is the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. ASC 820-10 requires that assets and liabilities are carried at fair value and are classified in one of the following three categories:

Level 1: Quoted prices in active markets for identical assets as of the reporting date.

Level 2: Inputs other than Level 1, that are observable either directly or indirectly as of the reporting date. For example, a common approach for valuing fixed income securities is the use of matrix pricing. Matrix

7

pricing is a mathematical technique used to value securities by relying on the securities’ relationship to other benchmark quoted prices.

Level 3: Unobservable inputs that are not supported by market data. Unobservable inputs are developed based on the best information available, which might include Teradyne’s own data.

For the right to sell the auction rate securities, held by Teradyne, back to UBS (“UBS Put”), Teradyne elected fair value treatment under ASC 825-10, “Financial Instruments.” The UBS Put was the only instrument of this nature or type that Teradyne held and for which Teradyne has elected the fair value option under ASC 825-10. The UBS Put was exercised in June 2010.

During the six months ended July 3, 2011 and July 4, 2010, there were no significant transfers in and out of Level 1 and Level 2.

The following table sets forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of July 3, 2011 and December 31, 2010.

	July 3, 2011
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Available for sale securities:
Money market funds	$	288,944	$	—	$	—	$	288,944
U.S. government agency securities		—		240,102		—		240,102
Commercial paper		—		235,540		—		235,540
U.S. Treasury securities		138,455		—		—		138,455
Corporate debt securities		—		129,084		—		129,084
Equity and debt mutual funds		8,754		—		—		8,754
Certificates of deposit and time deposits		—		8,381		—		8,381
Non-U.S. government securities		298		—		—		298
Total		436,451		613,107		—		1,049,558
Derivatives		—		135		—		135
Total	$	436,451	$	613,242	$	—	$	1,049,693

Reported as follows:

	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	288,944	$	24,694	$	—	$	313,638
Marketable securities		64,529		389,413		—		453,942
Long-term marketable securities		82,978		199,000		—		281,978
Prepayments and other current assets		—		135		—		135
	$	436,451	$	613,242	$	—	$	1,049,693

8

	December 31, 2010
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Available for sale securities:
U.S. government agency securities	$	—	$	341,510	$	—	$	341,510
Money market funds		238,607		—		—		238,607
U.S. Treasury securities		138,707		—		—		138,707
Commercial paper		—		103,448		—		103,448
Corporate debt securities		—		92,578		—		92,578
Certificates of deposit and time deposits		—		11,076		—		11,076
Equity and debt mutual funds		8,003		—		—		8,003
Non-U.S. government securities		278		—		—		278
Total	$	385,595	$	548,612	$	—	$	934,207
Liabilities
Derivatives	$	—	$	157	$	—	$	157
Total	$	—	$	157	$	—	$	157

Reported as follows:

	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	238,607	$	37,843	$	—	$	276,450
Marketable securities		62,294		346,767		—		409,061
Long-term marketable securities		84,694		164,002		—		248,696
	$	385,595	$	548,612	$	—	$	934,207
Liabilities
Other accrued liabilities	$	—	$	157	$	—	$	157

The following table represents changes in the fair value of Level 3 financial assets:

	For the Three Months Ended
	July 3, 2011				July 4, 2010
	Long-Term Auction Rate Securities		UBS Put		Long-Term Auction Rate Securities			UBS Put
	(in thousands)
Balance at beginning of period	$	—	$	—	$	23,697		$	2,687
Sale of auction rate securities and exercise of UBS Put		—		—		(20,863	)		(2,687	)
Change in unrealized gain included in interest income		—		—		2			—
Balance at end of period	$	—	$	—	$	2,836		$	—

9

	For the Six Months Ended
	July 3, 2011				July 4, 2010
	Long-Term Auction Rate Securities		UBS Put		Long-Term Auction Rate Securities			UBS Put
	(in thousands)
Balance at beginning of period	$	—	$	—	$	23,649		$	2,830
Sale of auction rate securities and exercise of UBS Put		—		—		(21,013	)		(2,687	)
Change in unrealized gain included in interest income		—		—		200			—
Change in unrealized loss included in interest expense and other		—		—		—			(143	)
Balance at end of period	$	—	$	—	$	2,836		$	—

During the three and six months ended July 3, 2011, Teradyne recorded a net gain of $0.1 million and a net loss $0.1 million, respectively, from sales of marketable securities. During the three and six months ended July 4, 2010, Teradyne recorded a loss of $0.1 million and $0.4 million, respectively, from sales of marketable securities and exercise of UBS Put.

Realized losses from sales of marketable securities, decreases in auction rate securities fair value and other-than-temporary impairment losses are included in interest expense and other. Realized gains from sales of marketable securities and increases in auction rate securities fair value are included in interest income.

The carrying amounts and fair values of financial instruments at July 3, 2011 and December 31, 2010 were as follows:

	July 3, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Marketable securities	$	735,920	$	735,920	$	657,757	$	657,757
Cash equivalents		313,638		313,638		276,450		276,450
Convertible debt(1)		149,873		542,213		144,059		506,350
Japan loan		7,423		7,423		8,573		8,573

(1) The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.

The fair values of cash, accounts receivable, net and accounts payable approximate the carrying amount due to the short term maturities of these instruments.

The following table summarizes available-for-sale marketable securities which are recorded at fair value:

	July 3, 2011
	Available-for-Sale									Fair Market Value of Investments with Unrealized  Losses
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value
	(in thousands)
Money market funds	$	288,944	$	—	$	—		$	288,944	$	—
U.S. government agency securities		239,366		764		(28	)		240,102		30,074
Commercial paper		235,556		17		(33	)		235,540		48,880
U.S. Treasury securities		137,934		533		(12	)		138,455		28,665
Corporate debt securities		128,664		497		(77	)		129,084		37,248
Equity and debt mutual funds		7,518		1,236		—			8,754		—
Certificates of deposit and time deposits		8,365		16		—			8,381		—
Non-U.S. government securities		298		—		—			298		—
	$	1,046,645	$	3,063	$	(150	)	$	1,049,558	$	144,867

10

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Cash and cash equivalents	$	313,639	$	—	$	(1	)	$	313,638	$	10,946
Marketable securities		453,619		367		(44	)		453,942		61,468
Long-term marketable securities		279,387		2,696		(105	)		281,978		72,453
	$	1,046,645	$	3,063	$	(150	)	$	1,049,558	$	144,867

	December 31, 2010
	Available-for-Sale									Fair Market Value of Investments with Unrealized  Losses
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value
	(in thousands)
U.S. government agency securities	$	341,349	$	334	$	(173	)	$	341,510	$	97,542
Money market funds		238,607		—		—			238,607		—
U.S. Treasury securities		138,354		360		(7	)		138,707		10,030
Commercial paper		103,472		1		(25	)		103,448		33,210
Corporate debt securities		92,464		170		(56	)		92,578		43,434
Certificates of deposit and time deposits		11,068		8		—			11,076		—
Equity and debt mutual funds		7,056		1,378		(431	)		8,003		1,088
Non-U.S. government securities		261		17		—			278		—
	$	932,631	$	2,268	$	(692	)	$	934,207	$	185,304

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Cash and cash equivalents	$	276,447	$	3	$	—		$	276,450	$	—
Marketable securities		408,934		178		(51	)		409,061		103,761
Long-term marketable securities		247,250		2,087		(641	)		248,696		81,543
	$	932,631	$	2,268	$	(692	)	$	934,207	$	185,304

On a quarterly basis, Teradyne reviews its investments to identify and evaluate those that have an indication of a potential other-than-temporary impairment. Factors considered in determining whether a loss is other-than-temporary include:

• The length of time and the extent to which the market value has been less than cost;

• The financial condition and near-term prospects of the issuer; and

• The intent and ability to retain the investment in the issuer for a period of time sufficient to allow for any anticipated recovery in market value.

As of July 3, 2011, the fair market value of investments with unrealized losses less than one year totaled $144.9 million. There were no unrealized losses greater than one year. As of December 31, 2010, the fair market value of investments with unrealized losses totaled $185.3 million. Of this value, $5.0 million had unrealized losses greater than one year and $180.3 million had unrealized losses less than one year.

11

Derivatives

Teradyne conducts business in a number of foreign countries, with certain transactions denominated in local currencies. The purpose of Teradyne’s foreign currency management is to minimize the effect of exchange rate fluctuations on certain foreign denominated net monetary assets. Teradyne does not use derivative financial instruments for trading or speculative purposes.

To minimize the effect of exchange rate fluctuations associated with the remeasurement of net monetary assets and liabilities denominated in foreign currencies, Teradyne enters into foreign currency forward contracts. The change in fair value of these derivatives is recorded directly in earnings, and is used to offset the change in fair value of the net monetary assets and liabilities denominated in foreign currencies.

The notional amount of foreign exchange contracts hedging monetary assets and liabilities denominated in foreign currencies was $49.5 million and $48.3 million at July 3, 2011 and December 31, 2010, respectively.

The following table summarizes the fair value of derivative instruments at July 3, 2011 and December 31, 2010.

	Balance Sheet Location	July 3, 2011		December 31, 2010
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Prepayments and other current assets	$	135	$	—
Foreign exchange contracts	Other accrued liabilities		—		157
		$	135	$	157

The following table summarizes the effect of derivative instruments in the statement of operations recognized during the three and six months ended July 3, 2011 and July 4, 2010. The table does not reflect the corresponding gains (losses) from the remeasurement of the monetary assets and liabilities denominated in foreign currencies.

	Location of Gains (Losses) Recognized in Statement of Operations	For the Three Months Ended						For the Six Months Ended
		July 3, 2011			July 4, 2010			July 3, 2011		July 4, 2010
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Interest expense and other	$	(166	)	$	(574	)	$	660	$	(1,260	)
		$	(166	)	$	(574	)	$	660	$	(1,260	)

See Note F “Debt” regarding derivatives related to convertible senior notes.

F. Debt

Loan Agreement

On March 31, 2009, Teradyne K.K., Teradyne’s wholly-owned subsidiary in Japan, entered into a loan agreement with a local bank in Japan to borrow approximately $10.0 million. The loan has a term of 5 years and a fixed interest rate of 0.81%. Approximately $6.0 million of the loan is collateralized by a real estate mortgage on Teradyne K.K.’s building and land in Kumamoto, Japan and approximately $4.0 million is unsecured. Teradyne, Inc. has guaranteed payment of the loan obligation. The loan is amortized over the term of the loan with semiannual principal payments of approximately $1.0 million payable on September 30 and March 30 each year. At July 3, 2011, approximately $2.5 million of the outstanding loan principal is included in current debt and approximately $4.9 million is classified as long-term debt.

12

Convertible Senior Notes

In April 2009, Teradyne issued 4.50% convertible senior notes (the “Notes”) at an aggregate principal amount of $190 million. The Notes will mature on March 15, 2014, unless earlier repurchased by Teradyne or converted. The Notes are senior unsecured obligations and rank equally with all of Teradyne’s existing and future senior debt and senior to any of Teradyne’s subordinated debt.

The Notes may be converted, under certain circumstances and during certain periods, at an initial conversion rate of approximately 182.65 shares of Teradyne’s common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $5.48, a 25% conversion premium based on the last reported sale price of $4.38 per share of Teradyne’s common stock on March 31, 2009. The conversion rate is subject to adjustment in certain circumstances.

During the three months ended July 3, 2011, the following circumstance that allows holders to convert their Notes at their option prior to December 15, 2013 occurred: the last reported sale price of Teradyne’s common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeded 130% of the conversion price in effect on the last trading day of the immediately preceding calendar quarter. As of August 9, 2011, no holders have exercised their option to convert their Notes.

Concurrently with the offering of the Notes, Teradyne entered into a convertible note hedge transaction with a strike price equal to the initial conversion price of the Notes, or approximately $5.48. The convertible note hedge allows Teradyne to receive shares of its common stock and/or cash related to the excess conversion value that it would pay to the holders of the Notes upon conversion. The convertible note hedges will cover, subject to customary antidilution adjustments, approximately 34,703,196 shares of Teradyne’s common stock. Teradyne paid approximately $64.6 million for the convertible note hedges.

Separately, Teradyne entered into a warrant transaction with a strike price of approximately $7.67 per share, which is 75% higher than the closing price of Teradyne’s common stock on March 31, 2009.

The convertible note hedge and warrant transaction will generally have the effect of increasing the conversion price of the Notes to approximately $7.67 per share of Teradyne’s common stock, representing a 75% conversion premium based upon the closing price of Teradyne’s common stock on March 31, 2009.

The Notes are classified as long-term debt in the balance sheet at July 3, 2011 and December 31, 2010. The tables below represent the components of Teradyne’s convertible senior notes:

	July 3, 2011		December 31, 2010
	(in thousands)
Debt principal	$	190,000	$	190,000
Unamortized debt discount		40,127		45,941
Net carrying amount of the convertible debt	$	149,873	$	144,059

	For the Three Months Ended				For the Six Months Ended
	July 3,   2011		July 4,   2010		July 3, 2011		July 4, 2010
	(in thousands)
Contractual interest expense	$	2,138	$	2,138	$	4,346	$	4,371
Amortization of the discount component and debt issue fees		3,160		2,783		6,221		5,480
Total interest expense on the convertible debt	$	5,298	$	4,921	$	10,567	$	9,851

13

As of July 3, 2011, the unamortized discount was $40.1 million, which will be amortized over approximately 2.75 years, and the carrying amount of the equity component was $63.4 million. As of July 3, 2011, the conversion rate was equal to the initial conversion price of approximately $5.48 per share and the if-converted value of the Notes was $526.8 million.

G. Deferred Revenue and Customer Advances

Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances.

	July 3, 2011		December 31, 2010
	(in thousands)
Customer advances	$	105,696	$	132,559
Maintenance, training and extended warranty		34,739		36,626
Undelivered elements		7,401		5,858
Acceptance		951		2,083
Total deferred revenue and customer advances	$	148,787	$	177,126

H. Product Warranty

Teradyne generally provides a one-year warranty on its products commencing upon installation or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Balance at beginning of period	$	9,502		$	8,339		$	9,886		$	6,435
Accruals for warranties issued during the period		3,976			5,202			7,553			8,857
Adjustments related to pre-existing warranties		(1,116	)		(234	)		(2,072	)		354
Settlements made during the period		(3,100	)		(2,671	)		(6,105	)		(5,010	)
Balance at end of period	$	9,262		$	10,636		$	9,262		$	10,636

When Teradyne receives revenue for extended warranties beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in deferred revenue and customer advances and long-term other accrued liabilities.

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Balance at beginning of period	$	9,870		$	4,470		$	8,972		$	4,055
Deferral of new extended warranty revenue		1,861			1,581			3,798			3,215
Recognition of extended warranty deferred revenue		(1,423	)		(408	)		(2,462	)		(1,627	)
Balance at end of period	$	10,308		$	5,643		$	10,308		$	5,643

14

I. Stock-Based Compensation

During the six months ended July 3, 2011, Teradyne granted service-based restricted stock units to employees, and service-based stock options and service and performance-based restricted stock units to executive officers. The total number of restricted stock units granted was 1.7 million at a weighted average grant date fair value of $16.20. Restricted stock units vest in equal installments over four years. The percentage level of performance satisfied for performance-based grants is assessed on or near the anniversary of the grant date and, in turn, that percentage level determines the number of performance-based restricted stock units available for vesting over the vesting period; portions of the performance-based grants not available for vesting are forfeited. The total number of stock options granted to executive officers was 0.1 million at a weighted average grant date fair value of $6.74. The stock options vest in equal installments over four years, and have a term of seven years from the date of grant.

During the six months ended July 4, 2010, Teradyne granted service-based restricted stock units to employees, and service and performance-based restricted stock units and stock options to executive officers. The total number of restricted stock units granted was 2.6 million at a weighted average grant date fair value of $9.42. The total number of stock options granted was 0.3 million at a weighted average grant date fair value of $4.10. Restricted stock units and stock options vest in equal installments over four years. The stock options have a term of seven years from the date of grant.

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Six Months Ended
	July 3, 2011			July 4, 2010
Expected life (years)		4.00			4.75
Interest rate		1.5	%		2.4	%
Volatility-historical		52.1	%		48.8	%
Dividend yield		0.0	%		0.0	%

Teradyne determined the stock options’ expected life based upon historical exercise data for executive officers, the age of the executive officers and the terms of the stock option grant. Volatility was determined using historical volatility for a period equal to the expected life. The risk-free rate was determined using the U.S. Treasury yield curve in effect at the time of grant.

The weighted-average fair value of employee stock purchase rights granted in the first six months of 2011 and 2010 was $3.66 and $3.05, respectively. The fair value of the employees’ purchase rights was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Six Months Ended
	July 3, 2011			July 4, 2010
Expected life (years)		0.5			0.5
Interest rate		0.19	%		0.18	%
Volatility-historical		41.5	%		45.5	%
Dividend yield		0.0	%		0.0	%

15

J. Comprehensive Income

Comprehensive income is calculated as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Net income	$	89,058		$	122,149		$	183,930		$	172,249
Foreign currency translation adjustment		—			210			2,266			(363	)
Unrealized gains (losses) on investments, net of tax of $0, $0, $0 and $0		1,298			(401	)		1,313			296
Actuarial (losses) gains arising during period, net of tax of $10, $1,121, ($5) and $1,247		(4,150	)		17,202			(4,201	)		17,587
Amortization included in net periodic pension and post-retirement costs:
Actuarial losses, net of tax of $8, $44, $20 and $90		2,377			953			4,455			2,707
Prior service costs, net of tax of $0, $0, $0 and $0		6			122			12			246
Settlement loss net of tax of $38, $0, $73 and $0		217			—			277			—
Comprehensive income	$	88,806		$	140,235		$	188,052		$	192,722

K. Intangible Assets

Amortizable intangible assets consist of the following and are included in intangible assets on the balance sheet:

	July 3, 2011
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	121,055	$	74,500	$	46,555		6.1 years
Customer relationships and service and software maintenance contracts		91,271		38,030		53,241		8.6 years
Trade names and trademarks		14,840		6,279		8,561		11.5 years
Customer backlog		300		300		—		0.5 years
Total intangible assets	$	227,466	$	119,109	$	108,357		7.6 years
	December 31, 2010
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	121,055	$	65,610	$	55,445		6.1 years
Customer relationships and service and software maintenance contracts		91,271		32,749		58,522		8.6 years
Trade names and trademarks		14,840		5,866		8,974		11.5 years
Customer backlog		300		300		—		0.5 years
Total intangible assets	$	227,466	$	104,525	$	122,941		7.6 years

16

Aggregate intangible asset amortization expense was $7.3 million and $14.6 million, respectively, for the three and six months ended July 3, 2011 and $7.3 million and $14.7 million, respectively, for the three and six months ended July 4, 2010. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:

Year	Amount (in thousands)
2011 (remainder)	$	13,238
2012		25,732
2013		24,683
2014		21,598
2015		4,575

L. Net Income per Common Share

The following table sets forth the computation of basic and diluted net income per common share:

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011		July 4, 2010
	(in thousands, except per share amounts)
Income from continuing operations	$	89,890		$	122,530		$	158,014	$	171,629
(Loss) Income from discontinued operations		—			(381	)		1,545		620
(Loss) Gain on disposal of discontinued operations		(832	)		—			24,371		—
Net income for basic net income per share	$	89,058		$	122,149		$	183,930	$	172,249
Income impact of assumed conversion of convertible notes		—			4,379			—		8,766
Net income for diluted net income per share	$	89,058		$	126,528		$	183,930	$	181,015
Weighted average common shares-basic		185,367			179,990			185,044		178,429
Effect of dilutive potential common shares:
Incremental shares from assumed conversion of convertible notes		22,711			34,703			23,036		34,703
Convertible note hedge warrant shares		17,914			11,225			18,368		10,174
Restricted stock units		3,877			2,924			4,222		2,896
Stock options		469			2,571			508		2,635
Employee stock purchase rights		114			128			88		72
Dilutive potential common shares		45,085			51,551			46,222		50,480
Weighted average common shares-diluted		230,452			231,541			231,266		228,909
Net income per common share-basic
Continuing operations	$	0.48		$	0.68		$	0.85	$	0.97
Discontinued operations		—			—			0.14		—
	$	0.48		$	0.68		$	0.99	$	0.97
Net income per common share-diluted
Continuing operations	$	0.39		$	0.55		$	0.68	$	0.79
Discontinued operations		—			—			0.12		—
	$	0.39		$	0.55		$	0.80	$	0.79

The computation of diluted net income per common share for the three and six months ended July 3, 2011 excludes the effect of the potential exercise of stock options to purchase approximately 0.5 million and 1.0 million shares, respectively, because the effect would have been anti-dilutive.

17

The computation of diluted net income per common share for the three and six months ended July 4, 2010 excludes the effect of the potential exercise of stock options to purchase approximately 4.5 million and 6.0 million shares and restricted stock units of 0.1 million and 0.4 million shares, respectively, because the effect would have been anti-dilutive.

With respect to the Teradyne’s convertible debt, Teradyne intends to settle its conversion spread (i.e., the intrinsic value of the embedded option feature contained in the convertible debt) in shares. Teradyne accounts for its conversion spread using the treasury stock method. In the fourth quarter of 2010, Teradyne determined that it had the ability and intent to settle the principal amount of the convertible debt in cash, accordingly as of the fourth quarter of 2010, the principal amount has been excluded from the determination of diluted earnings per share.

Teradyne’s call option on its common stock (convertible note hedge transaction) is excluded from the calculation of diluted shares because the effect would be anti-dilutive. See Note F “Debt” regarding convertible note hedge transaction.

M. Restructuring and Other, Net

Restructuring

In response to a downturn in the industry in 2008 and 2009, Teradyne initiated restructuring activities across all segments to reduce costs, principally through headcount reductions and facility consolidations. The tables below represent activity related to these actions. The remaining accrual for severance and benefits is reflected in the accrued employees’ compensation and withholdings account on the balance sheet and is expected to be paid by July 2012. The remaining accrual for lease payments on vacated facilities is reflected in the other accrued liabilities account and the long-term other accrued liabilities account and is expected to be paid over the lease terms, the latest of which expires in 2013. Teradyne expects to pay approximately $0.9 million against the lease accruals over the next twelve months. Teradyne’s future lease commitments are net of expected sublease income of $0.8 million as of July 3, 2011.

	Severance and Benefits			Facility Exit Costs			Total
	(in thousands)
Pre-2010 Activities
Balance at December 31, 2009	$	2,905		$	10,166		$	13,071
Change in estimate		240			(2,672	)		(2,432	)
Cash payments		(3,124	)		(4,193	)		(7,317	)
Balance at December 31, 2010		21			3,301			3,322
Change in estimate		—			(432	)		(432	)
Cash payments		(21	)		(242	)		(263	)
Balance at April 3, 2011		—			2,627			2,627
Cash payments		—			(301	)		(301	)
Balance at July 3, 2011	$	—		$	2,326		$	2,326

18

	Severance and Benefits			Facility Exit Costs		Total
	(in thousands)
2010 Activities
Q1 2010 Activity:
Provision	$	405		$	—	$	405
Cash payments		(405	)		—		(405	)
Balance at December 31, 2010	$	—		$	—	$	—
Q2 2010 Activity:
Provision	$	890		$	—	$	890
Cash payments		(402	)		—		(402	)
Balance at December 31, 2010		488			—		488
Provision		202			—		202
Cash payments		(690	)		—		(690	)
Balance at April 3, 2011	$	—		$	—	$	—
Q3 2010 Activity:
Provision	$	382		$	—	$	382
Cash payments		(72	)		—		(72	)
Other		(184	)		—		(184	)
Balance at December 31, 2010		126			—		126
Change in estimate		(47	)		—		(47	)
Cash payments		(79	)		—		(79	)
Balance at April 3, 2011	$	—		$	—	$	—
Q4 2010 Activity:
Provision	$	98		$	—	$	98
Balance at December 31, 2010		98			—		98
Provision		117			—		117
Cash payments		(215	)		—		(215	)
Balance at April 3, 2011	$	—		$	—	$	—
2011 Activity
Q1 2011 Activity:
Provision	$	572		$	—	$	572
Cash payments		(241	)		—		(241	)
Balance at April 3, 2011		331			—		331
Cash payments		(154	)		—		(154	)
Balance at July 3, 2011	$	177		$	—	$	177
Q2 2011 Activity:
Provision	$	344		$	—	$	344
Balance at July 3, 2011	$	344		$	—	$	344
Balance at July 3, 2011	$	521		$	2,326	$	2,847

During the six months ended July 3, 2011, Teradyne recorded the following restructuring charges:

Q2 2011 Action:

• $0.3 million of severance charges related to headcount reductions of 2 people in Semiconductor Test segment.

Q1 2011 Action:

• $0.6 million of severance charges related to headcount reductions of 5 people in Semiconductor Test segment.

19

Pre-2010 Actions:

• ($0.4) million related to changes in the estimated exit costs related to the Westford, MA and Poway, CA facilities in System Test Group segment, and the North Reading, MA facility across both segments.

Q2 2010 Actions:

• $0.2 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

Q3 2010 Actions:

• $0.1 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

During the six months ended July 4, 2010, Teradyne recorded the following restructuring charges:

Q1 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 4 people in Semiconductor Test segment.

Q2 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 6 people in Systems Test Group segment.

Q2 2009 Actions:

• $0.5 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

Other

During the six months ended July 3, 2011, Teradyne recorded a $0.9 million charge related to a non-U.S. pension settlement.

N. Retirement Plans

Defined Benefit Pension Plans

Teradyne has defined benefit pension plans covering a portion of domestic employees and employees of certain non-U.S. subsidiaries. Benefits under these plans are based on employees’ years of service and compensation. Teradyne’s funding policy is to make contributions to these plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of these plans consist primarily of equity and fixed income securities. In addition, Teradyne has foreign unfunded defined benefit pension plans and an unfunded supplemental executive defined benefit plan in the United States to provide retirement benefits in excess of levels allowed by the Employment Retirement Income Security Act and the Internal Revenue Code.

20

Components of net periodic pension cost for all plans were as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3,  2011			July 4,  2010			July 3,  2011			July 4,  2010
	(in thousands)
Service cost	$	668		$	921		$	1,493		$	1,952
Interest cost		4,459			4,268			8,849			8,816
Expected return on plan assets		(4,187	)		(5,273	)		(8,375	)		(10,140	)
Amortization of unrecognized:
Prior service cost		155			181			310			363
Net loss		2,341			1,022			4,386			2,768
Settlement		935			—			935			—
Total net periodic pension cost	$	4,371		$	1,119		$	7,598		$	3,759

In the six months ended July 3, 2011, Teradyne contributed $4.4 million primarily to its foreign pension plans.

Post-Retirement Benefit Plans

In addition to receiving pension benefits, U.S. Teradyne employees who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes death, and medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees’ survivors and are available to all retirees. Substantially all of Teradyne’s current U.S. employees could become eligible for these benefits, and the existing benefit obligation relates primarily to those employees.

Components of net periodic post-retirement cost were as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Service cost	$	14		$	7		$	30		$	27
Interest cost		134			174			269			392
Amortization of unrecognized:
Prior service benefit		(150	)		(59	)		(299	)		(117	)
Net loss		45			(25	)		90			29
Total net periodic post-retirement cost	$	43		$	97		$	90		$	331

O. Commitments and Contingencies

Purchase Commitments

As of July 3, 2011, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments are for less than one year and aggregate to approximately $190.7 million.

Legal Claims

Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on Teradyne’s results of operations, financial condition or cash flows.

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P. Segment Information

Teradyne’s two reportable segments are Semiconductor Test and Systems Test Group. The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The Systems Test Group segment includes operations related to the design, manufacturing and marketing of products and services for military/aerospace instrumentation test, hard disk drive test and circuit-board test and inspection.

Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income before income taxes. The accounting policies of the business segments are the same as those described in Note B “Accounting Policies” in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2010. Segment information is as follows:

	Semiconductor Test		Systems Test Group			Corporate and Eliminations			Consolidated
	(in thousands)
Three months ended July 3, 2011:
Net revenues	$	343,096	$	67,423		$	—		$	410,519
Income (loss) from continuing operations before income taxes(1)(2)		92,477		9,125			(3,873	)		97,729
Three months ended July 4, 2010:
Net revenues	$	413,059	$	32,212		$	—		$	445,271
Income (loss) from continuing operations before income taxes(1)(2)		141,911		(5,845	)		(3,993	)		132,073
Six months ended July 3, 2011:
Net revenues	$	662,346	$	125,334		$	—		$	787,680
Income (loss) from continuing operations before income taxes(1)(2)		167,893		14,313			(10,867	)		171,339
Six months ended July 4, 2010:
Net revenues	$	702,736	$	61,873		$	—		$	764,609
Income (loss) from continuing operations before income taxes(1)(2)		206,997		(11,472	)		(9,523	)		186,002

(1) Interest income and interest expense and other are included in Corporate and Eliminations.

(2) Included in the income (loss) from continuing operations before income taxes for each of the segments are charges for the three months and six months ended July 3, 2011 and July 4, 2010 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows:

Included in the Semiconductor Test segment are charges for the following:

	For the Three Months Ended				For the Six Months Ended
	July 3,   2011		July 4,   2010		July 3, 2011		July 4, 2010
	(in thousands)
Cost of revenues—provision for excess and obsolete inventory	$	1,500	$	—	$	5,942	$	496
Restructuring and other, net		1,279		—		2,170		1,082
Total	$	2,779	$	—	$	8,112	$	1,578

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Included in the Systems Test Group segment are charges for the following:

	For the Three Months Ended				For the Six Months Ended
	July 3, 2011		July 4, 2010		July 3, 2011			July 4, 2010
	(in thousands)
Cost of revenues—provision for excess and obsolete inventory	$	216	$	276	$	401		$	958
Restructuring and other, net		—		408		(246	)		229
Total	$	216	$	684	$	155		$	1,187

Included in the Corporate and Eliminations segment are charges for the following:

	For the Three Months Ended					For the Six Months Ended
	July 3, 2011		July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Restructuring and other, net	$	—	$	(37	)	$	(232	)	$	(37	)
Total	$	—	$	(37	)	$	(232	)	$	(37	)

Q. Subsequent Event

During the period from July 4, 2011 to August 9, 2011, Teradyne repurchased 1.5 million shares of common stock for $17.8 million at an average price of $12.30.

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Item 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations

Statements in this Quarterly Report on Form 10-Q which are not historical facts, so called “forward looking statements,” are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934, as amended. Investors are cautioned that all forward looking statements involve risks and uncertainties, including those detailed in Teradyne’s filings with the Securities and Exchange Commission. See also Part II, Item 1A of this Quarterly Report on Form 10-Q and Part I, Item 1A “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2010. Readers are cautioned not to place undue reliance on these forward-looking statements which reflect management’s analysis only as of the date hereof. We assume no obligation to update these forward-looking statements to reflect actual results or changes in factors or assumptions affecting forward-looking statements, except as may be required by law.

Overview

We are a leading global supplier of automatic test equipment. We design, develop, manufacture, and sell automatic test systems and solutions used to test complex electronics in the consumer electronics, automotive, computing, telecommunications, and aerospace and defense industries. Our automatic test equipment products and services include:

• semiconductor test (“Semiconductor Test”) systems; and

• military/aerospace (“Mil/Aero”) test instrumentation and systems, hard disk drive test (“HDD”) systems and circuit-board test and inspection (“Commercial Board Test”) systems (collectively these products represent “Systems Test Group”).

We have a broad customer base which includes integrated device manufacturers (“IDMs”), outsourced semiconductor assembly and test providers (“OSATs”), wafer foundries, fabless companies that design, but contract with others for the manufacture of integrated circuits (“ICs”), manufacturers of circuit boards, HDD manufacturers, aerospace and military contractors as well as the United States Department of Defense.

The sales of our products and services are dependent, to a large degree, on customers who are subject to cyclical trends in the demand for their products. These cyclical periods have had, and will continue to have, a significant effect on our business since our customers often delay or accelerate purchases in reaction to changes in their businesses and to demand fluctuations in the semiconductor industry. Historically, these demand fluctuations have resulted in significant variations in our results of operations. This was particularly relevant beginning in the fourth quarter of fiscal year 2008 where we saw a significant decrease in revenue in our Semiconductor Test business which was impacted by the deteriorating global economy, which negatively impacted the entire semiconductor industry. The sharp swings in the semiconductor industry in recent years have generally affected the semiconductor test equipment and services industry more significantly than the overall capital equipment sector.

Commencing in the fourth quarter of 2009, we experienced improvement in our Semiconductor Test business. We believe our acquisitions of Nextest and Eagle Test and our entry into the high speed memory and HDD markets have enhanced our opportunities for growth. We will continue to invest in our business to expand further our addressable markets while tightly managing our costs. As the last six quarters have demonstrated, with our current cost structure, we can achieve significantly higher profitability than we achieved at comparable revenue levels in the past.

We regularly face price competition in each of our businesses. More recently, we have been subject to greater price competition in the Semiconductor Test segment. We intend to respond to competitive pricing moves as necessary, which may adversely impact our gross margins. Longer term, we will continue to invest in engineering to lower the cost of test which should help mitigate the impacts from aggressive pricing actions.

On March 21, 2011, we completed the sale of our Diagnostic Solutions business unit, which was included in the Systems Test Group segment, to SPX Corporation for $40.2 million in cash. We sold this business as its growth potential as a stand-alone business was significantly less than if it was part of a larger automotive supplier. The financial information for Diagnostic Solutions has been reclassified to discontinued operations.

Critical Accounting Policies and Estimates

We have identified the policies which are critical to understanding our business and our results of operations. There have been no significant changes during the three months ended July 3, 2011 to the items disclosed as our critical accounting policies and estimates in Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the fiscal year ended December 31, 2010.

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SELECTED RELATIONSHIPS WITHIN THE CONDENSED CONSOLIDATED

STATEMENTS OF OPERATIONS

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
Percentage of total net revenues:
Net revenue:
Products		83	%		87	%		83	%		85	%
Services		17			13			17			15
Total net revenues		100			100			100			100
Cost of revenues:
Cost of products		39			37			40			37
Cost of services		9			7			8			8
Total cost of revenues		48			44			48			45
Gross profit		52			56			52			55
Operating expenses:
Engineering and development		12			11			12			13
Selling and administrative		14			13			15			15
Acquired intangible asset amortization		2			2			2			2
Restructuring and other, net		—			—			—			—
Total operating expenses		28			26			29			30
Income from operations		25			31			23			25
Interest & other		(1	)		(1	)		(1	)		(1	)
Income from continuing operations before income taxes		24			30			22			24
Income tax provision		2			2			2			2
Income from continuing operations		22			28			20			22
(Loss) Income from discontinued operations before income taxes		—			—			—			—
Income tax benefit		—			—			—			—
(Loss) Income from discontinued operations		—			—			—			—
(Loss) Gain on disposal of discontinued operations		—			—			3			—
Net income		22	%		28	%		23	%		22	%

Results of Operations

Second Quarter 2011 Compared to Second Quarter 2010

Book to Bill Ratio

Book to bill ratio is calculated as net bookings divided by net sales. Book to bill ratio by reportable segment was as follows:

	For the Three Months Ended
	July 3, 2011		July 4, 2010
Semiconductor Test		0.8		1.1
Systems Test Group		1.1		1.2
Total Company		0.8		1.1

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Revenue

Net revenues for our two reportable segments were as follows:

	For the Three Months Ended				Dollar Change
	July 3,   2011		July 4,   2010
	(in millions)
Semiconductor Test	$	343.1	$	413.1	$	(70.0	)
Systems Test Group		67.4		32.2		35.2
	$	410.5	$	445.3	$	(34.8	)

The decrease of $70.0 million or 17% in Semiconductor Test revenue was due to a decrease in System on a Chip product sales partially offset by an increase in memory product sales. The increase in Systems Test Group revenue of $35.2 million or 109% was primarily due to the increase in sales of Hard Disk Drive test systems.

Our revenues by region as a percentage of total net revenue were as follows:

	For the Three Months Ended
	July 3, 2011			July 4 , 2010
United States		15	%		14	%
Korea		15			8
Taiwan		12			24
Philippines		11			10
China		11			9
Europe		8			5
Thailand		8			5
Japan		7			4
Malaysia		6			10
Singapore		6			10
Rest of World		1			1
		100	%		100	%

Gross Profit

Our gross profit was as follows:

	For the Three Months Ended						Dollar/Point Change
	July 3,    2011			July 4,    2010
	(in millions)
Gross Profit	$	215.1		$	250.9		$	(35.8	)
Percent of Total Revenue		52.4	%		56.3	%		(3.9	)

The decrease in gross profit of 3.9 points was the result of a decrease of 2.0 points related to product mix primarily from higher Hard Disk Drive test system sales, a decrease of 1.3 points due to lower sales of previously written down inventory and higher inventory provisions, and a decrease of 0.3 points due to lower volume.

We assess the carrying value of our inventory on a quarterly basis by estimating future demand and comparing that demand against on-hand and on-order inventory positions. Forecasted revenue information is obtained from the sales and marketing groups and incorporates factors such as backlog and future revenue demand. This quarterly process

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identifies obsolete and excess inventory. Obsolete inventory, which represents items for which there is no demand, is fully reserved. Excess inventory, which represents inventory items that are not expected to be consumed during the next four quarters, is written-down to estimated net realizable value.

During the three months ended July 3, 2011, we recorded an inventory provision of $1.7 million included in cost of revenues, due to the downward revisions to previously forecasted demand levels. Of the $1.7 million of total excess and obsolete provisions recorded in the three months ended July 3, 2011, $1.5 million was related to Semiconductor Test and $0.2 million was related to Systems Test Group.

During the three months ended July 4, 2010, we recorded an inventory provision of $0.3 million included in cost of revenues related to Systems Test Group.

During the three months ended July 3, 2011 and July 4, 2010, we scrapped $2.2 million and $1.0 million of inventory, respectively. During the three months ended July 3, 2011 and July 4, 2010, we sold $0.8 million and $5.2 million, respectively, of previously written-down or written-off inventory. As of July 3, 2011, we had inventory related reserves for amounts which had been written-down or written-off totaling $124.7 million. We have no pre-determined timeline to scrap the remaining inventory.

Engineering and Development

Engineering and development expenses were as follows:

	For the Three Months Ended						Dollar Change
	July 3, 2011			July 4, 2010
	(in millions)
Engineering and Development	$	47.4		$	49.3		$	(1.9	)
Percent of Total Revenue		11.5	%		11.1	%

The decrease of $1.9 million in engineering and development expenses is due to a decrease in spending for engineering projects and lower variable compensation.

Selling and Administrative

Selling and administrative expenses were as follows:

	For the Three Months Ended						Dollar Change
	July 3, 2011			July 4, 2010
	(in millions)
Selling and Administrative	$	57.5		$	57.7		$	(0.2	)
Percent of Total Revenue		14.0	%		13.0	%

The decrease of $0.2 million in selling and administrative expenses is due primarily to lower variable compensation, partially offset by an increase in marketing and selling expenses for new products and customers.

Restructuring and Other, Net

Restructuring

In response to a downturn in the industry in 2008 and 2009, we initiated restructuring activities across all segments to reduce costs, principally through headcount reductions and facility consolidations. The tables below represent activity related to these actions. The remaining accrual for severance and benefits is reflected in the accrued employees’ compensation and withholdings account on the balance sheet and is expected to be paid by July 2012. The remaining accrual for lease payments on vacated facilities is reflected in the other accrued liabilities account and the long-term other accrued liabilities account and is expected to be paid over the lease

27

terms, the latest of which expires in 2013. We expect to pay approximately $0.9 million against the lease accruals over the next twelve months. Our future lease commitments are net of expected sublease income of $0.8 million as of July 3, 2011.

	Severance and Benefits			Facility Exit Costs			Total
	(in thousands)
Pre-2010 Activities
Balance at December 31, 2009	$	2,905		$	10,166		$	13,071
Change in estimate		240			(2,672	)		(2,432	)
Cash payments		(3,124	)		(4,193	)		(7,317	)
Balance at December 31, 2010		21			3,301			3,322
Change in estimate		—			(432	)		(432	)
Cash payments		(21	)		(242	)		(263	)
Balance at April 3, 2011		—			2,627			2,627
Cash payments		—			(301	)		(301	)
Balance at July 3, 2011	$	—		$	2,326		$	2,326
2010 Activities
Q1 2010 Activity:
Provision	$	405		$	—		$	405
Cash payments		(405	)		—			(405	)
Balance at December 31, 2010	$	—		$	—		$	—
Q2 2010 Activity:
Provision	$	890		$	—		$	890
Cash payments		(402	)		—			(402	)
Balance at December 31, 2010		488			—			488
Provision		202			—			202
Cash payments		(690	)		—			(690	)
Balance at April 3, 2011	$	—		$	—		$	—
Q3 2010 Activity:
Provision	$	382		$	—		$	382
Cash payments		(72	)		—			(72	)
Other		(184	)		—			(184	)
Balance at December 31, 2010		126			—			126
Change in estimate		(47	)		—			(47	)
Cash payments		(79	)		—			(79	)
Balance at April 3, 2011	$	—		$	—		$	—
Q4 2010 Activity:
Provision	$	98		$	—		$	98
Balance at December 31, 2010		98			—			98
Provision		117			—			117
Cash payments		(215	)		—			(215	)
Balance at April 3, 2011	$	—		$	—		$	—
2011 Activity
Q1 2011 Activity:
Provision	$	572		$	—		$	572
Cash payments		(241	)		—			(241	)
Balance at April 3, 2011		331			—			331
Cash payments		(154	)		—			(154	)
Balance at July 3, 2011	$	177		$	—		$	177
Q2 2011 Activity:
Provision	$	344		$	—		$	344
Balance at July 3, 2011	$	344		$	—		$	344
Balance at July 3, 2011	$	521		$	2,326		$	2,847

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During the three months ended July 3, 2011, we recorded the following restructuring charges:

Q2 2011 Action:

• $0.3 million of severance charges related to headcount reductions of 2 people in Semiconductor Test segment.

During the three months ended July 4, 2010, we recorded the following restructuring charges:

Q2 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 6 people in Systems Test Group segment.

Other

During the three months ended July 3, 2011, Teradyne recorded a $0.9 million charge related to a non-U.S. pension settlement.

Interest and Other

Interest income decreased by $2.3 million, from the second quarter of 2010 to 2011, due primarily to a gain from the sale of auction rate securities recorded in the second quarter of 2010. Interest expense and other decreased by $2.4 million, from the second quarter of 2010 to 2011, primarily due to a loss on the exercise of the auction rate securities related UBS Put recorded in the second quarter of 2010.

Income Taxes

For the three months ended July 3, 2011, we recorded a tax provision of $7.8 million from continuing operations, which consisted of U.S. federal, state and foreign taxes. For the three months ended July 4, 2010, we recorded a tax provision of $9.5 million from continuing operations, which consisted primarily of foreign taxes. Due to the continued uncertainty of realization, we have maintained our valuation allowance at July 3, 2011 for deferred tax assets in the U.S. and Singapore. We will assess the level of the valuation allowance required in the future period. Should more positive than negative evidence regarding the realizability of tax attributes exist in a future period, the valuation allowance may be reduced or eliminated altogether. Reduction of the valuation allowance, in whole or in part, would result in a non-cash income tax benefit during the period of reduction.

Six Months of 2011 Compared to Six Months of 2010

Revenue

Net revenues for our two reportable segments were as follows:

	For the Six Months Ended				Dollar Change
	July 3, 2011		July 4, 2010
	(in millions)
Semiconductor Test	$	662.3	$	702.7	$	(40.4	)
Systems Test Group		125.4		61.9		63.5
	$	787.7	$	764.6	$	23.1

The decrease of $40.4 million or 6% in Semiconductor Test revenue was due to a decrease in System on a Chip product sales, partially offset by an increase in memory product sales. The increase of $63.5 million or 103% in Systems Test Group revenue was primarily due to the increase in sales of Hard Disk Drive test systems.

29

Our revenues by region as a percentage of total net revenue were as follows:

	For the Six Months Ended
	July 3, 2011			July 4, 2010
United States		14	%		15	%
Taiwan		13			24
Korea		13			6
Philippines		12			10
Malaysia		11			9
China		9			8
Europe		7			5
Japan		7			4
Singapore		6			11
Thailand		6			6
Rest of World		2			2
		100	%		100	%

Gross Profit

Our gross profit was as follows:

	For the Six Months Ended						Dollar/Point Change
	July 3,  2011			July 4,  2010
	(in millions)
Gross Profit	$	407.5		$	420.8		$	(13.3	)
Percent of Total Revenue		51.7	%		55.0	%		(3.3	)

The decrease of 3.3 points was the result of a decrease of 2.4 points related to product mix primarily from higher Hard Disk Drive test system sales and a decrease of 0.8 points due to higher inventory provisions and lower sales of previously written down inventory.

We assess the carrying value of our inventory on a quarterly basis by estimating future demand and comparing that demand against on-hand and on-order inventory positions. Forecasted revenue information is obtained from the sales and marketing groups and incorporates factors such as backlog and future revenue demand. This quarterly process identifies obsolete and excess inventory. Obsolete inventory, which represents items for which there is no demand, is fully reserved. Excess inventory, which represents inventory items that are not expected to be consumed during the next four quarters, is written-down to estimated net realizable value.

During the six months ended July 3, 2011, we recorded an inventory provision of $6.3 million included in cost of revenues due to the downward revisions to previously forecasted demand levels. Of the $6.3 million of total excess and obsolete provisions recorded in the six months ended July 3, 2011, $5.9 million was related to Semiconductor Test and $0.4 million was related to Systems Test Group.

During the six months ended July 4, 2010, we recorded an inventory provision of $1.5 million included in cost of revenues. Of the $1.5 million of total excess and obsolete provisions recorded in the six months ended July 4, 2010, $1.0 million was related to Systems Test Group and $0.5 million was related to Semiconductor Test.

30

During the six months ended July 3, 2011 and July 4, 2010, we scrapped $2.6 million and $2.0 million of inventory, respectively. During the six months ended July 3, 2011 and July 4, 2010, we sold $3.8 million and $5.2 million, respectively, of previously written-down or written-off inventory. As of July 3, 2011, we had inventory related reserves for amounts which had been written-down or written-off totaling $124.7 million. We have no pre-determined timeline to scrap the remaining inventory.

Engineering and Development

Engineering and development expenses were as follows:

	For the Six Months Ended						Dollar Change
	July 3, 2011			July 4 , 2010
	(in millions)
Engineering and Development	$	95.4		$	97.3		$	(1.9	)
Percent of Total Revenue		12.1	%		12.7	%

The decrease of $1.9 million in engineering and development expenses is due to lower spending for engineering projects and lower variable compensation.

Selling and Administrative

Selling and administrative expenses were as follows:

	For the Six Months Ended						Dollar Change
	July 3, 2011			July 4, 2010
	(in millions)
Selling and Administrative	$	115.7		$	112.4		$	3.3
Percent of Total Revenue		14.7	%		14.7	%

The increase of $3.3 million in selling and administrative expenses is due primarily to an increase in marketing and selling expenses for new products and customers, partially offset by lower variable compensation.

Restructuring and Other, Net

Restructuring

In response to a downturn in the industry in 2008 and 2009, we initiated restructuring activities across all segments to reduce costs, principally through headcount reductions and facility consolidations. The tables below represent activity related to these actions. The remaining accrual for severance and benefits is reflected in the accrued employees’ compensation and withholdings account on the balance sheet and is expected to be paid by July 2012. The remaining accrual for lease payments on vacated facilities is reflected in the other accrued liabilities account and the long-term other accrued liabilities account and is expected to be paid over the lease terms, the latest of which expires in 2013. We expect to pay approximately $0.9 million against the lease accruals over the next twelve months. Our future lease commitments are net of expected sublease income of $0.8 million as of July 3, 2011.

31

	Severance and Benefits			Facility Exit Costs			Total
	(in thousands)
Pre-2010 Activities
Balance at December 31, 2009	$	2,905		$	10,166		$	13,071
Change in estimate		240			(2,672	)		(2,432	)
Cash payments		(3,124	)		(4,193	)		(7,317	)
Balance at December 31, 2010		21			3,301			3,322
Change in estimate		—			(432	)		(432	)
Cash payments		(21	)		(242	)		(263	)
Balance at April 3, 2011		—			2,627			2,627
Cash payments		—			(301	)		(301	)
Balance at July 3, 2011	$	—		$	2,326		$	2,326
2010 Activities
Q1 2010 Activity:
Provision	$	405		$	—		$	405
Cash payments		(405	)		—			(405	)
Balance at December 31, 2010	$	—		$	—		$	—
Q2 2010 Activity:
Provision	$	890		$	—		$	890
Cash payments		(402	)		—			(402	)
Balance at December 31, 2010		488			—			488
Provision		202			—			202
Cash payments		(690	)		—			(690	)
Balance at April 3, 2011	$	—		$	—		$	—
Q3 2010 Activity:
Provision	$	382		$	—		$	382
Cash payments		(72	)		—			(72	)
Other		(184	)		—			(184	)
Balance at December 31, 2010		126			—			126
Change in estimate		(47	)		—			(47	)
Cash payments		(79	)		—			(79	)
Balance at April 3, 2011	$	—		$	—		$	—
Q4 2010 Activity:
Provision	$	98		$	—		$	98
Balance at December 31, 2010		98			—			98
Provision		117			—			117
Cash payments		(215	)		—			(215	)
Balance at April 3, 2011	$	—		$	—		$	—
2011 Activity
Q1 2011 Activity:
Provision	$	572		$	—		$	572
Cash payments		(241	)		—			(241	)
Balance at April 3, 2011		331			—			331
Cash payments		(154	)		—			(154	)
Balance at July 3, 2011	$	177		$	—		$	177
Q2 2011 Activity:
Provision	$	344		$	—		$	344
Balance at July 3, 2011	$	344		$	—		$	344
Balance at July 3, 2011	$	521		$	2,326		$	2,847

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During the six months ended July 3, 2011, we recorded the following restructuring charges:

Q2 2011 Action:

• $0.3 million of severance charges related to headcount reductions of 2 people in Semiconductor Test segment.

Q1 2011 Action:

• $0.6 million of severance charges related to headcount reductions of 5 people in Semiconductor Test segment.

Pre-2010 Actions:

• ($0.4) million related to changes in the estimated exit costs related to the Westford, MA and Poway, CA facilities in System Test Group segment, and the North Reading, MA facility across both segments.

Q2 2010 Actions:

• $0.2 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

Q3 2010 Actions:

• $0.1 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

During the six months ended July 4, 2010, we recorded the following restructuring charges:

Q1 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 4 people in Semiconductor Test segment.

Q2 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 6 people in Systems Test Group segment.

Q2 2009 Actions:

• $0.5 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

Other

During the six months ended July 3, 2011, we recorded a $0.9 million charge related to a non-U.S. pension settlement

Interest and Other

Interest income decreased by $1.8 million, from the first six months of 2010 to 2011, due primarily to a gain from the sale of auction rate securities recorded in the second quarter of 2010, partially offset by higher interest income due to an increase in our marketable securities balance in 2011. Interest expense and other decreased by $2.2 million, from the first six months of 2010 to 2011, primarily due to a loss on the exercise of the auction rate securities related UBS Put recorded in the second quarter of 2010.

33

Income Taxes

For the six months ended July 3, 2011, we recorded a tax provision of $13.3 million from continuing operations, which consisted of U.S. federal, state and foreign taxes. For the six months ended July 4, 2010, we recorded a tax provision of $14.4 million, which consisted primarily of foreign taxes. Due to the continued uncertainty of realization, we have maintained our valuation allowance at July 3, 2011 for deferred tax assets in the U.S. and Singapore. We will assess the level of the valuation allowance required in the future period. Should more positive than negative evidence regarding the realizability of tax attributes exist in a future period, the valuation allowance may be reduced or eliminated altogether. Reduction of the valuation allowance, in whole or in part, would result in a non-cash income tax benefit during the period of reduction.

Liquidity and Capital Resources

Our cash, cash equivalents and marketable securities balance increased by $135.8 million in the first six months of 2011 to $1.2 billion. Cash activity for the first six months of 2011 and 2010 was as follows:

	For the Six Months Ended
	July 3, 2011			July 4, 2010
	(in millions)
Cash provided by operating activities:
Income from continuing operations, adjusted for non-cash items	$	227.7		$	239.4
Change in operating assets and liabilities, net of businesses sold		(101.9	)		(107.3	)
Cash (used for) provided by discontinued operations		(4.2	)		1.9
Total cash provided by operating activities		121.6			134.0
Cash used for investing activities from continuing operations		(122.5	)		(187.5	)
Cash provided by investing activities from discontinued operations		39.1			—
Total cash used for investing activities		(83.4	)		(187.5	)
Total cash provided by financing activities		19.5			40.8
Increase (decrease) in cash and cash equivalents	$	57.7		$	(12.7	)

34

In the six months ended July 3, 2011, changes in operating assets and liabilities, net of businesses sold, used cash of $101.9 million. This was due to a $64.4 million increase in operating assets and a $37.5 million decrease in operating liabilities.

The increase in operating assets was due to a $39.1 million increase in accounts receivable and a $15.0 million increase in inventories due to higher sales volume, and a $10.3 million increase in prepayments and other assets. The decrease in operating liabilities was due to a $44.0 million decrease in accrued employee compensation due primarily to variable compensation payments, a $26.9 million decrease in customer advance payments due to shipments of systems prepaid by customers, $5.2 million of retirement plan contributions, and a $1.4 million decrease in deferred revenue, partially offset by a $25.9 million increase in accounts payable due to increased sales volume and an $8.7 million increase in other accrued liabilities, and a $5.4 million increase in accrued income taxes.

Investing activities during the six months ended July 3, 2011 used cash of $122.5 million, due to $498.5 million used for purchases of marketable securities and $44.5 million used for purchases of property, plant and equipment, partially offset by proceeds from sales and maturities of marketable securities that provided cash of $420.5 million.

Financing activities during the six months ended July 3, 2011 provided cash of $19.5 million, $17.0 million from the issuance of common stock under stock option and stock purchase plans, and $3.7 million from the tax benefit related to stock options and restricted stock units, partially offset by $1.2 million of cash used for a payment on long-term debt.

In the six months ended July 4, 2010, changes in operating assets and liabilities, net of businesses sold, used cash of $107.3 million. This was due to an $83.4 million increase in operating assets and a $23.9 million decrease in operating liabilities. The increase in operating assets was due to an increase in accounts receivable of $123.2 million partially offset by a $24.2 million decrease in inventories due to higher sales volume, and a decrease in prepayments and other assets of $15.6 million. The decrease in operating liabilities consisted mainly of a $62.9 million decrease in deferred revenue due to shipments of systems prepaid by customers in 2009, $24.7 million of retirement plan contributions, a $4.3 million decrease in other accrued expenses due to convertible

35

note interest payment, partially offset by a $29.3 million increase in accounts payable, a $19.3 million increase in accrued employee compensation, an $11.3 million increase in accrued income taxes, and an $8.1 million increase in other accrued liabilities.

Investing activities during the six months ended July 4, 2010 used cash of $187.5 million, due to $223.8 million used for purchases of marketable securities and $35.7 million used for purchases of property, plant and equipment, partially offset by proceeds from sales of marketable securities that provided cash of $71.0 million, and proceeds from life insurance that provided cash of $1.1 million.

Financing activities during the six months ended July 4, 2010 provided cash of $40.8 million, $41.9 million was from the issuance of common stock under stock option and stock purchase plans which was partially offset by $1.1 million of cash used for a payment on long-term debt.

We believe our cash, cash equivalents and marketable securities balance of $1.2 billion will be sufficient to meet working capital and expenditure needs for at least the next twelve months. Inflation has not had a significant long-term impact on earnings.

Equity Compensation Plans

As discussed in Note M “Stock Based Compensation” in our 2010 Form 10-K, we have a 1996 Employee Stock Purchase Plan and a 2006 Equity and Cash Compensation Incentive Plan (the “2006 Equity Plan”).

The purpose of the 1996 Employee Stock Purchase Plan is to encourage stock ownership by all eligible employees of Teradyne. The purpose of the 2006 Equity Plan is to provide equity ownership and compensation opportunities in Teradyne to our employees, officers, directors, consultants and/or advisors. Both plans were approved by our shareholders.

Recently Issued Accounting Pronouncements

In March 2010, FASB issued an Accounting Standards Update 2010-17, “Milestone Method of Revenue Recognition”, to Accounting Standards Codification 605, “Revenue Recognition.” The guidance in this consensus allows the milestone method as an acceptable revenue recognition methodology when an arrangement includes substantive milestones. The guidance provides a definition of substantive milestone and should be applied regardless of whether the arrangement includes single or multiple deliverables or units of accounting. The scope of this consensus is limited to the transactions involving milestones relating to research and development deliverables. The guidance includes enhanced disclosure requirements about each arrangement, individual milestones and related contingent consideration, information about substantive milestones and factors considered in the determination. The consensus is effective prospectively to milestones achieved in fiscal years, and interim periods within those years, after June 15, 2010. We adopted this final consensus prospectively in January 2011 and the adoption had no material impact on our financial position or results of operations.

In May 2011, the FASB issued ASU No. 2011-04, “Fair Value Measurement.” This ASU clarifies the concepts related to highest and best use and valuation premise, blockage factors and other premiums and discounts, the fair value measurement of financial instruments held in a portfolio and of those instruments classified as a component of shareowners’ equity. The guidance includes enhanced disclosure requirements about recurring Level 3 fair value measurements, the use of nonfinancial assets, and the level in the fair value hierarchy of assets and liabilities not recorded at fair value. The provisions of this ASU are effective prospectively for interim and annual periods beginning on or after December 15, 2011. Early application is prohibited. This ASU requires changes in presentation only and we do not expect it will have a material impact on our consolidated financial statements.

36

In June 2011, the FASB issued ASU No. 2011-05, “Comprehensive Income.” This ASU intends to enhance comparability and transparency of other comprehensive income components. The guidance provides an option to present total comprehensive income, the components of net income and the components of other comprehensive income in a single continuous statement or two separate but consecutive statements. This ASU eliminates the option to present other comprehensive income components as part of the statement of changes in shareowners’ equity. The provisions of this ASU will be applied retrospectively for interim and annual periods beginning after December 15, 2011. Early application is permitted. We are currently evaluating the impact of this new ASU.

Item 3: Quantitative and Qualitative Disclosures about Market Risk

For “Quantitative and Qualitative Disclosures about Market Risk” affecting Teradyne, see Item 7a. “Quantitative and Qualitative Disclosures about Market Risks,” in our Annual Report on Form 10-K filed with the SEC on March 1, 2011. There were no material changes in our exposure to market risk from those set forth in our Annual Report for the fiscal year ended December 31, 2010.

Item 4: Controls and Procedures

As of the end of the period covered by this report, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures pursuant to Rule 13a-15(b) promulgated under the Exchange Act. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of the end of the period covered by this report, our disclosure controls and procedures were effective in ensuring that material information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, including ensuring that such material information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

During the period covered by this report, there have been no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met.

37

PART II. OTHER INFORMATION

Item 1: Legal Proceedings

We are subject to various legal proceedings and claims which have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on our results of operations, financial condition or cash flows.

Item 1A: Risk Factors

In addition to the other information set forth in this Form 10-Q, you should carefully consider the factors discussed in Part I, “Item 1A: Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2010, which could materially affect our business, financial condition or future results. The risk factors described in our Annual Report on Form 10-K remain applicable to our business with the addition of new risk factors set forth below.

The risks described in our Annual Report on Form 10-K are not the only risks that we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

The recent natural disaster in Japan could disrupt our operations and those of our customers and adversely affect our results of operations.

The recent events in Japan, including earthquakes, tsunamis and the related damage, have created economic uncertainty in that country. The combined effect of these events could impact short-term, end-user demand, disrupt our global supply chain for components manufactured in Japan, increase the cost of components that we acquire due to reduced supply, as well as cause other unforeseen effects to our business. As a result of the events in Japan, we purchased buffer inventory for certain components that are sourced in Japan and we may make additional inventory purchases in the future. Based on a review of our global supply chain and the customers’ test facilities we serve in Japan, we do not expect a significant impact on our long-term ability to manufacture and sell our products, however, this situation remains uncertain and there can be no assurance that an adverse effect on our business, financial condition and operating results will not result from these events.

Our operations and the operations of our customers and suppliers are subject to risks of natural catastrophic events, widespread health epidemics, acts of war, terrorist attacks and the threat of domestic and international terrorist attacks, any one of which could result in cancellation of orders, delays in deliveries or other business activities, or loss of customers and could negatively affect our business and results of operations.

Our business is international in nature, with our sales, service and administrative personnel and our customers and suppliers located in numerous countries throughout the world. Our operations and those of our customers and suppliers are subject to disruption for a variety of reasons, including work stoppages, acts of war, terrorism, health epidemics, fires, earthquakes, hurricanes, volcanic eruptions, energy shortages, telecommunication failures, tsunamis, flooding or other natural disasters. Such disruption could materially increase our costs and expenses as well as cause delays in, among other things, shipments of products to our customers, our ability to perform services requested by our customers, or the installation and acceptance of our products at customer sites. Any of these conditions could have a material adverse effect on our business, financial conditions and results of operations.

38

Item 2: Unregistered Sales of Equity Securities and Use of Proceeds

In November 2007, Teradyne’s Board of Directors (the “Board”) authorized a $400 million stock repurchase program. The cumulative repurchases under this program as of December 31, 2008 totaled 8.5 million shares of common stock for $102.6 million at an average price of $12.14 per share. As of November 4, 2008, the Board suspended the stock repurchase program.

In November 2010, the Board cancelled the November 2007 stock repurchase program and authorized a new stock repurchase program for up to $200 million. During the three months ended July 3, 2011, Teradyne did not repurchase any shares of common stock.

The following table includes information with respect to repurchases we made of our common stock during the quarter ended July 3, 2011 (in thousands):

Period	(a) Total Number of Shares (or units) Purchased		(b) Average Price Paid per Share (or Unit)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs		(d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that may Yet Be Purchased Under the Plans or Programs
April 4, 2011 – May 1, 2011		—	$	—		—	$	200,000
May 2, 2011 – May 29, 2011		—	$	—		—	$	200,000
May 30, 2011 – July 3, 2011		—	$	—		—	$	200,000

During the period from July 4, 2011 to August 9, 2011, we repurchased 1.5 million shares of our common stock for $17.8 million at an average price of $12.30.

Item 6: Exhibits

Exhibit Number	Description
31.1	Certification of Principal Executive Officer, pursuant to Rule 13a-14(a) of Securities and Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)
31.2	Certification of Principal Financial Officer, pursuant to Rule 13a-14(a) of Securities and Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)
32.1	Certification pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith)
32.2	Certification pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith)
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document

* XBRL (Extensible Business Reporting Language) information is furnished and not filed or a part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

39

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

TERADYNE, INC.

Registrant

/S/    GREGORY R. BEECHER        

Gregory R. Beecher

Vice President,

Chief Financial Officer and Treasurer

(Duly Authorized Officer
and Principal Financial Officer)

August 12, 2011

40

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Michael A. Bradley, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Teradyne, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 12, 2011

By:	/S/    MICHAEL A. BRADLEY
	Michael A. Bradley Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Gregory R. Beecher, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Teradyne, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 12, 2011

By:	/S/    GREGORY R. BEECHER
	Gregory R. Beecher Chief Financial Officer and Treasurer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Teradyne, Inc. (the “Company”) on Form 10-Q for the period ending July 3, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael A. Bradley, Chief Executive Officer of the Company, certify pursuant to 18 U.S.C (S) 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

/S/    MICHAEL A. BRADLEY        

Michael A. Bradley

Chief Executive Officer

August 12, 2011

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Teradyne, Inc. (the “Company”) on Form 10-Q for the period ending July 3, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gregory R. Beecher, Chief Financial Officer of the Company, certify pursuant to 18 U.S.C (S) 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

/S/    GREGORY R. BEECHER        

Gregory R. Beecher

Chief Financial Officer and Treasurer

August 12, 2011

XML



Product Warranty (Schedule Of Product Warranty) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Product Warranty
Balance at beginning of period	$ 9,502	$ 8,339	$ 9,886	$ 6,435
Accruals for warranties issued during the period	3,976	5,202	7,553	8,857
Adjustments related to pre-existing warranties	(1,116)	(234)	(2,072)	354
Settlements made during the period	(3,100)	(2,671)	(6,105)	(5,010)
Balance at end of period	$ 9,262	$ 10,636	$ 9,262	$ 10,636

XML



Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jul. 03, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 4,097	$ 3,752
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	186,002	182,035
Common stock, shares outstanding	186,002	182,035

XML



Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended				6 Months Ended
	Jul. 03, 2011		Jul. 04, 2010		Jul. 03, 2011		Jul. 04, 2010
Net revenues:
Products	$ 341,316		$ 386,734		$ 657,035		$ 650,220
Services	69,203		58,537		130,645		114,389
Total net revenues	410,519		445,271		787,680		764,609
Cost of revenues:
Cost of products	159,995		164,421		313,358		285,294
Cost of services	35,438		29,948		66,827		58,537
Total cost of revenues	195,433		194,369		380,185		343,831
Gross profit	215,086		250,902		407,495		420,778
Operating expenses:
Engineering and development	47,393		49,341		95,370		97,278
Selling and administrative	57,481		57,730		115,710		112,417
Acquired intangible asset amortization	7,291		7,313		14,582		14,668
Restructuring and other, net	1,279		371		1,692		1,274
Total operating expenses	113,444		114,755		227,354		225,637
Income from operations	101,642		136,147		180,141		195,141
Interest income	1,403		3,681		2,690		4,523
Interest expense and other	(5,316)		(7,755)		(11,492)		(13,662)
Income from continuing operations before income taxes	97,729	[1],[2]	132,073	[1],[2]	171,339	[1],[2]	186,002	[1],[2]
Income tax provision	7,839		9,543		13,325		14,373
Income from continuing operations	89,890		122,530		158,014		171,629
(Loss) Income from discontinued operations before income taxes			(381)		1,278		620
Income tax benefit					(267)
(Loss) Income from discontinued operations			(381)		1,545		620
(Loss) Gain on disposal of discontinued operations (net of income tax of $0, $0, $4,578, $0, respectively)	(832)				24,371
Net income	$ 89,058		$ 122,149		$ 183,930		$ 172,249
Income per common share from continuing operations:
Basic	$ 0.48		$ 0.68		$ 0.85		$ 0.97
Diluted	$ 0.39		$ 0.55		$ 0.68		$ 0.79
Net income per common share:
Basic	$ 0.48		$ 0.68		$ 0.99		$ 0.97
Diluted	$ 0.39		$ 0.55		$ 0.80		$ 0.79
Weighted average common share-basic	185,367		179,990		185,044		178,429
Weighted average common share-diluted	230,452		231,541		231,266		228,909

[1] Included in the income (loss) from continuing operations before income taxes for each of the segments are charges for the three months and six months ended July 3, 2011 and July 4, 2010 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows:

[2] Interest income and interest expense and other are included in Corporate and Eliminations.

XML



Stock-Based Compensation (Schedule Of Estimated Fair Value Of Stock Options Assumptions ) (Details)	6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010
Stock Options [Member]
Expected life (years)	4.00	4.75
Interest rate	1.50%	2.40%
Volatility-historical	52.10%	48.80%
Dividend yield	0.00%	0.00%
Stock Purchase Rights [Member]
Expected life (years)	0.5	0.5
Interest rate	0.19%	0.18%
Volatility-historical	41.50%	45.50%
Dividend yield	0.00%	0.00%

XML



Subsequent Event

6 Months Ended

Jul. 03, 2011

Subsequent Event

Subsequent Event

Q. Subsequent Event

During the period from July 4, 2011 to August 9, 2011, Teradyne repurchased 1.5 million shares of common stock for $17.8 million at an average price of $12.30.

XML



Document And Entity Information	6 Months Ended
	Jul. 03, 2011	Aug. 08, 2011
Document And Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 03, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Trading Symbol	ter
Entity Registrant Name	TERADYNE, INC
Entity Central Index Key	0000097210
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		186,184,101

XML



Debt (Components Of Convertible Senior Notes) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010	Dec. 31, 2010
Debt
Debt principal	$ 190,000		$ 190,000		$ 190,000
Unamortized debt discount	40,127		40,127		45,941
Net carrying amount of the convertible debt	149,873		149,873		144,059
Contractual interest expense	2,138	2,138	4,346	4,371
Amortization of the discount component and debt issue fees	3,160	2,783	6,221	5,480
Total interest expense on the convertible debt	$ 5,298	$ 4,921	$ 10,567	$ 9,851

XML



Financial Instruments And Derivatives (Tables)

6 Months Ended

12 Months Ended

Jul. 03, 2011

Dec. 31, 2010

Financial Instruments And Derivatives

Schedule Of Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis

	July 3, 2011
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Available for sale securities:
Money market funds	$	288,944	$	—	$	—	$	288,944
U.S. government agency securities		—		240,102		—		240,102
Commercial paper		—		235,540		—		235,540
U.S. Treasury securities		138,455		—		—		138,455
Corporate debt securities		—		129,084		—		129,084
Equity and debt mutual funds		8,754		—		—		8,754
Certificates of deposit and time deposits		—		8,381		—		8,381
Non-U.S. government securities		298		—		—		298
Total		436,451		613,107		—		1,049,558
Derivatives		—		135		—		135
Total	$	436,451	$	613,242	$	—	$	1,049,693

	December 31, 2010
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Available for sale securities:
U.S. government agency securities	$	—	$	341,510	$	—	$	341,510
Money market funds		238,607		—		—		238,607
U.S. Treasury securities		138,707		—		—		138,707
Commercial paper		—		103,448		—		103,448
Corporate debt securities		—		92,578		—		92,578
Certificates of deposit and time deposits		—		11,076		—		11,076
Equity and debt mutual funds		8,003		—		—		8,003
Non-U.S. government securities		278		—		—		278
Total	$	385,595	$	548,612	$	—	$	934,207
Liabilities
Derivatives	$	—	$	157	$	—	$	157
Total	$	—	$	157	$	—	$	157

Schedule Of Reported Financial Assets And Liabilities

	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	288,944	$	24,694	$	—	$	313,638
Marketable securities		64,529		389,413		—		453,942
Long-term marketable securities		82,978		199,000		—		281,978
Prepayments and other current assets		—		135		—		135
	$	436,451	$	613,242	$	—	$	1,049,693

	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	238,607	$	37,843	$	—	$	276,450
Marketable securities		62,294		346,767		—		409,061
Long-term marketable securities		84,694		164,002		—		248,696
	$	385,595	$	548,612	$	—	$	934,207
Liabilities
Other accrued liabilities	$	—	$	157	$	—	$	157

Schedule Of Changes In Fair Value Of Level 3 Financial Assets

	For the Three Months Ended
	July 3, 2011				July 4, 2010
	Long-Term Auction Rate Securities		UBS Put		Long-Term Auction Rate Securities			UBS Put
	(in thousands)
Balance at beginning of period	$	—	$	—	$	23,697		$	2,687
Sale of auction rate securities and exercise of UBS Put		—		—		(20,863	)		(2,687	)
Change in unrealized gain included in interest income		—		—		2			—
Balance at end of period	$	—	$	—	$	2,836		$	—
	For the Six Months Ended
	July 3, 2011				July 4, 2010
	Long-Term Auction Rate Securities		UBS Put		Long-Term Auction Rate Securities			UBS Put
	(in thousands)
Balance at beginning of period	$	—	$	—	$	23,649		$	2,830
Sale of auction rate securities and exercise of UBS Put		—		—		(21,013	)		(2,687	)
Change in unrealized gain included in interest income		—		—		200			—
Change in unrealized loss included in interest expense and other		—		—		—			(143	)
Balance at end of period	$	—	$	—	$	2,836		$	—

Schedule Of Carrying Amounts And Fair Values Of Financial Instruments

	July 3, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Marketable securities	$	735,920	$	735,920	$	657,757	$	657,757
Cash equivalents		313,638		313,638		276,450		276,450
Convertible debt(1)		149,873		542,213		144,059		506,350
Japan loan		7,423		7,423		8,573		8,573

(1) The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.

Schedule Of Available-For-Sale Of Marketable Securities

	July 3, 2011
	Available-for-Sale									Fair Market Value of Investments with Unrealized  Losses
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value
	(in thousands)
Money market funds	$	288,944	$	—	$	—		$	288,944	$	—
U.S. government agency securities		239,366		764		(28	)		240,102		30,074
Commercial paper		235,556		17		(33	)		235,540		48,880
U.S. Treasury securities		137,934		533		(12	)		138,455		28,665
Corporate debt securities		128,664		497		(77	)		129,084		37,248
Equity and debt mutual funds		7,518		1,236		—			8,754		—
Certificates of deposit and time deposits		8,365		16		—			8,381		—
Non-U.S. government securities		298		—		—			298		—
	$	1,046,645	$	3,063	$	(150	)	$	1,049,558	$	144,867

	December 31, 2010
	Available-for-Sale									Fair Market Value of Investments with Unrealized  Losses
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value
	(in thousands)
U.S. government agency securities	$	341,349	$	334	$	(173	)	$	341,510	$	97,542
Money market funds		238,607		—		—			238,607		—
U.S. Treasury securities		138,354		360		(7	)		138,707		10,030
Commercial paper		103,472		1		(25	)		103,448		33,210
Corporate debt securities		92,464		170		(56	)		92,578		43,434
Certificates of deposit and time deposits		11,068		8		—			11,076		—
Equity and debt mutual funds		7,056		1,378		(431	)		8,003		1,088
Non-U.S. government securities		261		17		—			278		—
	$	932,631	$	2,268	$	(692	)	$	934,207	$	185,304

Schedule Of Reported Available-For-Sale Marketable Securities

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Cash and cash equivalents	$	313,639	$	—	$	(1	)	$	313,638	$	10,946
Marketable securities		453,619		367		(44	)		453,942		61,468
Long-term marketable securities		279,387		2,696		(105	)		281,978		72,453
	$	1,046,645	$	3,063	$	(150	)	$	1,049,558	$	144,867

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Cash and cash equivalents	$	276,447	$	3	$	—		$	276,450	$	—
Marketable securities		408,934		178		(51	)		409,061		103,761
Long-term marketable securities		247,250		2,087		(641	)		248,696		81,543
	$	932,631	$	2,268	$	(692	)	$	934,207	$	185,304

Schedule Of Fair Value Of Derivative Instruments

	Balance Sheet Location	July 3, 2011		December 31, 2010
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Prepayments and other current assets	$	135	$	—
Foreign exchange contracts	Other accrued liabilities		—		157
		$	135	$	157

Schedule Of Effect Of Derivative Instruments On Statement Of Operation Recognized

	Location of Gains (Losses) Recognized in Statement of Operations	For the Three Months Ended						For the Six Months Ended
		July 3, 2011			July 4, 2010			July 3, 2011		July 4, 2010
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Interest expense and other	$	(166	)	$	(574	)	$	660	$	(1,260	)
		$	(166	)	$	(574	)	$	660	$	(1,260	)

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Debt (Narrative) (Details) (USD $)	1 Months Ended	6 Months Ended
	Mar. 31, 2009	Jul. 03, 2011	Jun. 30, 2011	Dec. 31, 2010	Mar. 31, 2009 4.50% Convertible Senior Notes Due March 15, 2014 [Member]	Jul. 03, 2011 Convertible Senior Notes [Member]	Apr. 01, 2009 Convertible Senior Notes [Member]	Mar. 31, 2009 Convertible Notes Hedge And Warrant [Member]	Jul. 03, 2011 Short-Term Debt [Member]	Jul. 03, 2011 Long-Term Debt [Member]
Borrowings from local bank	$ 10,000,000
Term of loan, years	5
Loan collateralized by real estate mortgage	6,000,000
Unsecured loan	4,000,000
Semiannual principal payments of loan		1,000,000
Outstanding loan principal amount									2,500,000	4,900,000
Aggregate principal amount		190,000,000		190,000,000			190,000,000
Debt instrument, interest rate, stated percentage	0.81%				4.50%
Senior notes maturity date	March 15, 2014
Additional aggregate principal amount			1,000
Initial conversion rate			The Notes may be converted, under certain circumstances and during certain periods, at an initial conversion rate of approximately 182.65 shares of Teradyne's common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $5.48, a 25% conversion premium based on the last reported sale price of $4.38 per share of Teradyne's common stock on March 31, 2009.
Initial debt conversion price	$ 5.48	$ 5.48						$ 7.67
Last reported sale price of debt	$ 4.38
Debt conversion premium percentage	25.00%
Antidilution adjustments, shares		34,703,196
Convertible note hedges		64,600,000
Strike price of warrant	7.67
Percentage of warrant price in excess of closing price of common stock	75.00%
Warrants conversion premium percentage	75.00%
Unamortized debt discount		40,127,000		45,941,000		40,100,000
Amortization period of unamortized discount, years		2.75
Carrying amount of equity component		63,400,000
Conversion value of notes		$ 526,800,000

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Debt

6 Months Ended

Jul. 03, 2011

Debt

Debt

F. Debt

Loan Agreement

On March 31, 2009, Teradyne K.K., Teradyne's wholly-owned subsidiary in Japan, entered into a loan agreement with a local bank in Japan to borrow approximately $10.0 million. The loan has a term of 5 years and a fixed interest rate of 0.81%. Approximately $6.0 million of the loan is collateralized by a real estate mortgage on Teradyne K.K.'s building and land in Kumamoto, Japan and approximately $4.0 million is unsecured. Teradyne, Inc. has guaranteed payment of the loan obligation. The loan is amortized over the term of the loan with semiannual principal payments of approximately $1.0 million payable on September 30 and March 30 each year. At July 3, 2011, approximately $2.5 million of the outstanding loan principal is included in current debt and approximately $4.9 million is classified as long-term debt.

Convertible Senior Notes

In April 2009, Teradyne issued 4.50% convertible senior notes (the "Notes") at an aggregate principal amount of $190 million. The Notes will mature on March 15, 2014, unless earlier repurchased by Teradyne or converted. The Notes are senior unsecured obligations and rank equally with all of Teradyne's existing and future senior debt and senior to any of Teradyne's subordinated debt.

The Notes may be converted, under certain circumstances and during certain periods, at an initial conversion rate of approximately 182.65 shares of Teradyne's common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $5.48, a 25% conversion premium based on the last reported sale price of $4.38 per share of Teradyne's common stock on March 31, 2009. The conversion rate is subject to adjustment in certain circumstances.

During the three months ended July 3, 2011, the following circumstance that allows holders to convert their Notes at their option prior to December 15, 2013 occurred: the last reported sale price of Teradyne's common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeded 130% of the conversion price in effect on the last trading day of the immediately preceding calendar quarter. As of August 9, 2011, no holders have exercised their option to convert their Notes.

Concurrently with the offering of the Notes, Teradyne entered into a convertible note hedge transaction with a strike price equal to the initial conversion price of the Notes, or approximately $5.48. The convertible note hedge allows Teradyne to receive shares of its common stock and/or cash related to the excess conversion value that it would pay to the holders of the Notes upon conversion. The convertible note hedges will cover, subject to customary antidilution adjustments, approximately 34,703,196 shares of Teradyne's common stock. Teradyne paid approximately $64.6 million for the convertible note hedges.

Separately, Teradyne entered into a warrant transaction with a strike price of approximately $7.67 per share, which is 75% higher than the closing price of Teradyne's common stock on March 31, 2009.

The convertible note hedge and warrant transaction will generally have the effect of increasing the conversion price of the Notes to approximately $7.67 per share of Teradyne's common stock, representing a 75% conversion premium based upon the closing price of Teradyne's common stock on March 31, 2009.

The Notes are classified as long-term debt in the balance sheet at July 3, 2011 and December 31, 2010. The tables below represent the components of Teradyne's convertible senior notes:

	July 3, 2011		December 31, 2010
	(in thousands)
Debt principal	$	190,000	$	190,000
Unamortized debt discount		40,127		45,941
Net carrying amount of the convertible debt	$	149,873	$	144,059

	For the Three Months Ended				For the Six Months Ended
	July 3,   2011		July 4,   2010		July 3, 2011		July 4, 2010
	(in thousands)
Contractual interest expense	$	2,138	$	2,138	$	4,346	$	4,371
Amortization of the discount component and debt issue fees		3,160		2,783		6,221		5,480
Total interest expense on the convertible debt	$	5,298	$	4,921	$	10,567	$	9,851

As of July 3, 2011, the unamortized discount was $40.1 million, which will be amortized over approximately 2.75 years, and the carrying amount of the equity component was $63.4 million. As of July 3, 2011, the conversion rate was equal to the initial conversion price of approximately $5.48 per share and the if-converted value of the Notes was $526.8 million.

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Debt (Tables)

6 Months Ended

Jul. 03, 2011

Debt

Components Of Convertible Senior Notes

	July 3, 2011		December 31, 2010
	(in thousands)
Debt principal	$	190,000	$	190,000
Unamortized debt discount		40,127		45,941
Net carrying amount of the convertible debt	$	149,873	$	144,059

	For the Three Months Ended				For the Six Months Ended
	July 3, 2011		July 4, 2010		July 3, 2011		July 4, 2010
	(in thousands)
Contractual interest expense	$	2,138	$	2,138	$	4,346	$	4,371
Amortization of the discount component and debt issue fees		3,160		2,783		6,221		5,480
Total interest expense on the convertible debt	$	5,298	$	4,921	$	10,567	$	9,851

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Financial Instruments And Derivatives (Schedule Of Available-For-Sale Of Marketable Securities) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Available-for-sale marketable securities, Cost	$ 1,046,645	$ 932,631
Available-for-sale Securities, Unrealized Gain	3,063	2,268
Available-for-sale marketable securities, Unrealized (Loss)	(150)	(692)
Available-for-sale marketable securities, Fair Market Value	1,049,558	934,207
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	144,867	185,304
U.S. Government Agency Securities [Member]
Available-for-sale marketable securities, Cost	239,366	341,349
Available-for-sale Securities, Unrealized Gain	764	334
Available-for-sale marketable securities, Unrealized (Loss)	(28)	(173)
Available-for-sale marketable securities, Fair Market Value	240,102	341,510
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	30,074	97,542
Money Market Funds [Member]
Available-for-sale marketable securities, Cost	288,944	238,607
Available-for-sale marketable securities, Fair Market Value	288,944	238,607
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses
Commercial Paper [Member]
Available-for-sale marketable securities, Cost	235,556	103,472
Available-for-sale Securities, Unrealized Gain	17	1
Available-for-sale marketable securities, Unrealized (Loss)	(33)	(25)
Available-for-sale marketable securities, Fair Market Value	235,540	103,448
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	48,880	33,210
U.S. Treasury Securities [Member]
Available-for-sale marketable securities, Cost	137,934	138,354
Available-for-sale Securities, Unrealized Gain	533	360
Available-for-sale marketable securities, Unrealized (Loss)	(12)	(7)
Available-for-sale marketable securities, Fair Market Value	138,455	138,707
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	28,665	10,030
Corporate Debt Securities [Member]
Available-for-sale marketable securities, Cost	128,664	92,464
Available-for-sale Securities, Unrealized Gain	497	170
Available-for-sale marketable securities, Unrealized (Loss)	(77)	(56)
Available-for-sale marketable securities, Fair Market Value	129,084	92,578
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	37,248	43,434
Certificates Of Deposit And Time Deposits [Member]
Available-for-sale marketable securities, Cost	8,365	11,068
Available-for-sale Securities, Unrealized Gain	16	8
Available-for-sale marketable securities, Fair Market Value	8,381	11,076
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses
Equity And Debt Mutual Funds [Member]
Available-for-sale marketable securities, Cost	7,518	7,056
Available-for-sale Securities, Unrealized Gain	1,236	1,378
Available-for-sale marketable securities, Unrealized (Loss)		(431)
Available-for-sale marketable securities, Fair Market Value	8,754	8,003
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		1,088
Non-U.S. Government Securities [Member]
Available-for-sale marketable securities, Cost	298	261
Available-for-sale Securities, Unrealized Gain		17
Available-for-sale marketable securities, Fair Market Value	298	278
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses

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Financial Instruments And Derivatives (Narrative) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010	Dec. 31, 2010
Financial Instruments And Derivatives
Net gain(loss) from sale of marketable securities	$ 0.1	$ 0.1	$ 0.1	$ 0.4
Fair market value of investments with unrealized losses	144.9		144.9		185.3
Unrealized losses on temporary investments			0
Notional amount of foreign exchange contracts hedging monetary assets and liabilities	49.5		49.5		48.3
Fair market value of investments with unrealized losses greater than one year					5.0
Fair market value of investments with unrealized losses less than one year					$ 180.3

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Discontinued Operations (Tables)

6 Months Ended

Jul. 03, 2011

Discontinued Operations

Schedule Of Net Revenues And (Loss) Income From Discontinued Operations

	For the Three Months Ended						For the Six Months Ended
	July 3,   2011			July 4,   2010			July 3, 2011		July 4, 2010
	(in thousands)
Net revenues	$	—		$	9,505		$	9,086	$	19,790
(Loss) Income from discontinued operations before income taxes	$	—		$	(381	)	$	1,278	$	620
(Loss) Gain from disposal of discontinued operations before income taxes		(832	)		—			28,949		—
Income tax provision		—			—			4,311		—
(Loss) Income from discontinued operations	$	(832	)	$	(381	)	$	25,916	$	620

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Intangible Assets

6 Months Ended

Jul. 03, 2011

Intangible Assets

Intangible Assets

K. Intangible Assets

Amortizable intangible assets consist of the following and are included in intangible assets on the balance sheet:

	July 3, 2011
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	121,055	$	74,500	$	46,555		6.1 years
Customer relationships and service and software maintenance contracts		91,271		38,030		53,241		8.6 years
Trade names and trademarks		14,840		6,279		8,561		11.5 years
Customer backlog		300		300		—		0.5 years
Total intangible assets	$	227,466	$	119,109	$	108,357		7.6 years
	December 31, 2010
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	121,055	$	65,610	$	55,445		6.1 years
Customer relationships and service and software maintenance contracts		91,271		32,749		58,522		8.6 years
Trade names and trademarks		14,840		5,866		8,974		11.5 years
Customer backlog		300		300		—		0.5 years
Total intangible assets	$	227,466	$	104,525	$	122,941		7.6 years

Aggregate intangible asset amortization expense was $7.3 million and $14.6 million, respectively, for the three and six months ended July 3, 2011 and $7.3 million and $14.7 million, respectively for the three and six months ended July 4, 2010. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:

Year	Amount (in thousands)
2011 (remainder)	$	13,238
2012		25,732
2013		24,683
2014		21,598
2015		4,575

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Accounting Policies

6 Months Ended

Jul. 03, 2011

Accounting Policies

Accounting Policies

B. Accounting Policies

Basis of Presentation

The condensed consolidated interim financial statements include the accounts of Teradyne and its subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair presentation of such interim financial statements. Certain prior year's amounts were reclassified to conform to the current year presentation. The December 31, 2010 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.

The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne's Annual Report on Form 10-K, filed with the SEC on March 1, 2011 for the year ended December 31, 2010.

On March 21, 2011, Teradyne completed the sale of Diagnostic Solutions, its automotive diagnostic and test business unit. The results of operations of Diagnostic Solutions as well as balance sheet and cash flow amounts pertaining to this business have been classified as discontinued operations in the condensed consolidated financial statements (see Note D "Discontinued Operations").

Preparation of Financial Statements

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts reported in the financial statements. Actual results may differ significantly from these estimates.

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Retirement Plans (Tables)

6 Months Ended

Jul. 03, 2011

Net Periodic Pension Cost [Member]

Components Of Net Periodic Pension Cost

	For the Three Months Ended						For the Six Months Ended
	July 3,  2011			July 4,  2010			July 3,  2011			July 4,  2010
	(in thousands)
Service cost	$	668		$	921		$	1,493		$	1,952
Interest cost		4,459			4,268			8,849			8,816
Expected return on plan assets		(4,187	)		(5,273	)		(8,375	)		(10,140	)
Amortization of unrecognized:
Prior service cost		155			181			310			363
Net loss		2,341			1,022			4,386			2,768
Settlement		935			—			935			—
Total net periodic pension cost	$	4,371		$	1,119		$	7,598		$	3,759

Other Postretirement Benefit Plans, Defined Benefit [Member]

Components Of Net Periodic Pension Cost

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Service cost	$	14		$	7		$	30		$	27
Interest cost		134			174			269			392
Amortization of unrecognized:
Prior service benefit		(150	)		(59	)		(299	)		(117	)
Net loss		45			(25	)		90			29
Total net periodic post-retirement cost	$	43		$	97		$	90		$	331

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Product Warranty

6 Months Ended

Jul. 03, 2011

Product Warranty

Product Warranty

H. Product Warranty

Teradyne generally provides a one-year warranty on its products commencing upon installation or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Balance at beginning of period	$	9,502		$	8,339		$	9,886		$	6,435
Accruals for warranties issued during the period		3,976			5,202			7,553			8,857
Adjustments related to pre-existing warranties		(1,116	)		(234	)		(2,072	)		354
Settlements made during the period		(3,100	)		(2,671	)		(6,105	)		(5,010	)
Balance at end of period	$	9,262		$	10,636		$	9,262		$	10,636

When Teradyne receives revenue for extended warranties beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in deferred revenue and customer advances and long-term other accrued liabilities.

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Balance at beginning of period	$	9,870		$	4,470		$	8,972		$	4,055
Deferral of new extended warranty revenue		1,861			1,581			3,798			3,215
Recognition of extended warranty deferred revenue		(1,423	)		(408	)		(2,462	)		(1,627	)
Balance at end of period	$	10,308		$	5,643		$	10,308		$	5,643

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Restructuring And Other, Net

6 Months Ended

Jul. 03, 2011

Restructuring And Other, Net

Restructuring And Other, Net

M. Restructuring and Other, Net

Restructuring

In response to a downturn in the industry in 2008 and 2009, Teradyne initiated restructuring activities across all segments to reduce costs, principally through headcount reductions and facility consolidations. The tables below represent activity related to these actions. The remaining accrual for severance and benefits is reflected in the accrued employees' compensation and withholdings account on the balance sheet and is expected to be paid by July 2012. The remaining accrual for lease payments on vacated facilities is reflected in the other accrued liabilities account and the long-term other accrued liabilities account and is expected to be paid over the lease terms, the latest of which expires in 2013. Teradyne expects to pay approximately $0.9 million against the lease accruals over the next twelve months. Teradyne's future lease commitments are net of expected sublease income of $0.8 million as of July 3, 2011.

	Severance and Benefits			Facility Exit Costs			Total
	(in thousands)
Pre-2010 Activities
Balance at December 31, 2009	$	2,905		$	10,166		$	13,071
Change in estimate		240			(2,672	)		(2,432	)
Cash payments		(3,124	)		(4,193	)		(7,317	)
Balance at December 31, 2010		21			3,301			3,322
Change in estimate		—			(432	)		(432	)
Cash payments		(21	)		(242	)		(263	)
Balance at April 3, 2011		—			2,627			2,627
Cash payments		—			(301	)		(301	)
Balance at July 3, 2011	$	—		$	2,326		$	2,326
2010 Activities
Q1 2010 Activity:
Provision	$	405		$	—		$	405
Cash payments		(405	)		—			(405	)
Balance at December 31, 2010	$	—		$	—		$	—
Q2 2010 Activity:
Provision	$	890		$	—		$	890
Cash payments		(402	)		—			(402	)
Balance at December 31, 2010		488			—			488
Provision		202			—			202
Cash payments		(690	)		—			(690	)
Balance at April 3, 2011	$	—		$	—		$	—
Q3 2010 Activity:
Provision	$	382		$	—		$	382
Cash payments		(72	)		—			(72	)
Other		(184	)		—			(184	)
Balance at December 31, 2010		126			—			126
Change in estimate		(47	)		—			(47	)
Cash payments		(79	)		—			(79	)
Balance at April 3, 2011	$	—		$	—		$	—
Q4 2010 Activity:
Provision	$	98		$	—		$	98
Balance at December 31, 2010		98			—			98
Provision		117			—			117
Cash payments		(215	)		—			(215	)
Balance at April 3, 2011	$	—		$	—		$	—
2011 Activity
Q1 2011 Activity:
Provision	$	572		$	—		$	572
Cash payments		(241	)		—			(241	)
Balance at April 3, 2011		331			—			331
Cash payments		(154	)		—			(154	)
Balance at July 3, 2011	$	177		$	—		$	177
Q2 2011 Activity:
Provision	$	344		$	—		$	344
Balance at July 3, 2011	$	344		$	—		$	344
Balance at July 3, 2011	$	521		$	2,326		$	2,847

During the six months ended July 3, 2011, Teradyne recorded the following restructuring charges:

Q2 2011 Action:

• $0.3 million of severance charges related to headcount reductions of 2 people in Semiconductor Test segment.

Q1 2011 Action:

• $0.6 million of severance charges related to headcount reductions of 5 people in Semiconductor Test segment.

Pre-2010 Actions:

• ($0.4) million related to changes in the estimated exit costs related to the Westford, MA and Poway, CA facilities in System Test Group segment, and the North Reading, MA facility across both segments.

Q2 2010 Actions:

• $0.2 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

Q3 2010 Actions:

• $0.1 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

During the six months ended July 4, 2010, Teradyne recorded the following restructuring charges:

Q1 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 4 people in Semiconductor Test segment.

Q2 2010 Actions:

• $0.4 million of severance charges related to headcount reductions of 6 people in Systems Test Group segment.

Q2 2009 Actions:

• $0.5 million related to a change in the estimated severance benefits related to headcount reduction activities across both segments.

Other

During the six months ended July 3, 2011, Teradyne recorded a $0.9 million charge related to a non-U.S. pension settlement.

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Stock-Based Compensation

6 Months Ended

Jul. 03, 2011

Stock-Based Compensation

Stock-Based Compensation

I. Stock-Based Compensation

During the six months ended July 3, 2011, Teradyne granted service-based restricted stock units to employees, and service-based stock options and service and performance-based restricted stock units to executive officers. The total number of restricted stock units granted was 1.7 million at a weighted average grant date fair value of $16.20. Restricted stock units vest in equal installments over four years. The percentage level of performance satisfied for performance-based grants is assessed on or near the anniversary of the grant date and, in turn, that percentage level determines the number of performance-based restricted stock units available for vesting over the vesting period; portions of the performance-based grants not available for vesting are forfeited. The total number of stock options granted to executive officers was 0.1 million at a weighted average grant date fair value of $6.74. The stock options vest in equal installments over four years, and have a term of seven years from the date of grant.

During the six months ended July 4, 2010, Teradyne granted service-based restricted stock units to employees, and service and performance-based restricted stock units and stock options to executive officers. The total number of restricted stock units granted was 2.6 million at a weighted average grant date fair value of $9.42. The total number of stock options granted was 0.3 million at a weighted average grant date fair value of $4.10. Restricted stock units and stock options vest in equal installments over four years. The stock options have a term of seven years from the date of grant.

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Six Months Ended
	July 3, 2011			July 4, 2010
Expected life (years)		4.00			4.75
Interest rate		1.5	%		2.4	%
Volatility-historical		52.1	%		48.8	%
Dividend yield		0.0	%		0.0	%

Teradyne determined the stock options' expected life based upon historical exercise data for executive officers, the age of the executive officers and the terms of the stock option grant. Volatility was determined using historical volatility for a period equal to the expected life. The risk-free rate was determined using the U.S. Treasury yield curve in effect at the time of grant.

The weighted-average fair value of employee stock purchase rights granted in the first six months of 2011 and 2010 was $3.66 and $3.05, respectively. The fair value of the employees' purchase rights was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Six Months Ended
	July 3, 2011			July 4, 2010
Expected life (years)		0.5			0.5
Interest rate		0.19	%		0.18	%
Volatility-historical		41.5	%		45.5	%
Dividend yield		0.0	%		0.0	%

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Intangible Assets (Tables)

6 Months Ended

Jul. 03, 2011

Intangible Assets

Schedule Of Amortizable Intangible Assets

	July 3, 2011
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	121,055	$	74,500	$	46,555		6.1 years
Customer relationships and service and software maintenance contracts		91,271		38,030		53,241		8.6 years
Trade names and trademarks		14,840		6,279		8,561		11.5 years
Customer backlog		300		300		—		0.5 years
Total intangible assets	$	227,466	$	119,109	$	108,357		7.6 years
	December 31, 2010
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	121,055	$	65,610	$	55,445		6.1 years
Customer relationships and service and software maintenance contracts		91,271		32,749		58,522		8.6 years
Trade names and trademarks		14,840		5,866		8,974		11.5 years
Customer backlog		300		300		—		0.5 years
Total intangible assets	$	227,466	$	104,525	$	122,941		7.6 years

Schedule Of Estimated Intangible Asset Amortization Expense

Year	Amount (in thousands)
2011 (remainder)	$	13,238
2012		25,732
2013		24,683
2014		21,598
2015		4,575

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Deferred Revenue And Customer Advances

6 Months Ended

Jul. 03, 2011

Deferred Revenue And Customer Advances

Deferred Revenue And Customer Advances

G. Deferred Revenue and Customer Advances

Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances.

	July 3, 2011		December 31, 2010
	(in thousands)
Customer advances	$	105,696	$	132,559
Maintenance, training and extended warranty		34,739		36,626
Undelivered elements		7,401		5,858
Acceptance		951		2,083
Total deferred revenue and customer advances	$	148,787	$	177,126

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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data	6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010
Restricted stock units granted	1.7	2.6
Weighted average of restricted stock units granted	$ 16.20	$ 9.42
Number of stock options granted to executive officers	0.1	0.3
Weighted average of stock options granted to executive officers	$ 6.74	$ 4.10
Term of stock option granted, years	seven	seven
Stock Options [Member]
Period of stock granted to employees and executive officers vest in equal installments, years	four	four
Restricted Stock Units (RSUs) [Member]
Period of stock granted to employees and executive officers vest in equal installments, years	four	four
Stock Purchase Rights [Member]
Weighted average of stock options granted to executive officers	$ 3.66	$ 3.05

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Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010
Cash flows from operating activities:
Net income	$ 183,930	$ 172,249
Less: income from discontinued operations	1,545	620
Less: gain on disposal of discontinued operations	24,371
Income from continuing operations	158,014	171,629
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation	25,645	26,403
Amortization	25,291	23,105
Stock-based compensation	14,682	15,141
Provision for excess and obsolete inventory	6,343	1,454
Tax benefit related to stock options and restricted stock units	(3,717)
Other	1,424	1,659
Changes in operating assets and liabilities, net of businesses sold:
Accounts receivable	(39,067)	(123,184)
Inventories	(15,006)	24,231
Prepayments and other assets	(10,348)	15,544
Deferred revenue and customer advances	(28,339)	(62,901)
Accounts payable and accrued expenses	(9,279)	52,377
Retirement plan contributions	(5,241)	(24,677)
Accrued income taxes	5,406	11,346
Net cash provided by operating activities from continuing operations	125,808	132,127
Net cash (used for) provided by operating activities from discontinued operations	(4,225)	1,850
Net cash provided by operating activities	121,583	133,977
Cash flows from investing activities:
Purchases of property, plant and equipment	(44,467)	(35,706)
Purchases of available-for-sale marketable securities	(498,541)	(223,820)
Proceeds from sales and maturities of available-for-sale marketable securities	420,477	47,267
Proceeds from sales of trading marketable securities		23,700
Proceeds from life insurance		1,091
Net cash used for investing activities from continuing operations	(122,531)	(187,468)
Net cash provided by investing activities from discontinued operations	39,062
Net cash used for investing activities	(83,469)	(187,468)
Cash flows from financing activities:
Issuance of common stock under employee stock option and stock purchase plans	17,052	41,873
Tax benefit related to stock options and restricted stock units	3,717
Payments of long-term debt	(1,222)	(1,123)
Net cash provided by financing activities	19,547	40,750
Increase (decrease) in cash and cash equivalents	57,661	(12,741)
Cash and cash equivalents at beginning of period	397,737	416,737
Cash and cash equivalents at end of period	$ 455,398	$ 403,996

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Recently Issued Accounting Pronouncements

6 Months Ended

Jul. 03, 2011

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

C. Recently Issued Accounting Pronouncements

In March 2010, FASB issued an Accounting Standards Update ("ASU") 2010-17, "Milestone Method of Revenue Recognition", to Accounting Standards Codification ("ASC") 605, "Revenue Recognition." The guidance in this consensus allows the milestone method as an acceptable revenue recognition methodology when an arrangement includes substantive milestones. The guidance provides a definition of substantive milestone and should be applied regardless of whether the arrangement includes single or multiple deliverables or units of accounting. The scope of this consensus is limited to the transactions involving milestones relating to research and development deliverables. The guidance includes enhanced disclosure requirements about each arrangement, individual milestones and related contingent consideration, information about substantive milestones and factors considered in the determination. The consensus is effective prospectively to milestones achieved in fiscal years, and interim periods within those years, after June 15, 2010. Teradyne adopted this final consensus prospectively in January 2011. This adoption had no material impact on Teradyne's financial position or results of operations.

In May 2011, the FASB issued ASU No. 2011-04, "Fair Value Measurement." This ASU clarifies the concepts related to highest and best use and valuation premise, blockage factors and other premiums and discounts, the fair value measurement of financial instruments held in a portfolio and of those instruments classified as a component of shareowners' equity. The guidance includes enhanced disclosure requirements about recurring Level 3 fair value measurements, the use of nonfinancial assets, and the level in the fair value hierarchy of assets and liabilities not recorded at fair value. The provisions of this ASU are effective prospectively for interim and annual periods beginning on or after December 15, 2011. Early application is prohibited. This ASU requires changes in presentation only and Teradyne does not expect it will have a material impact on its consolidated financial statements.

In June 2011, the FASB issued ASU No. 2011-05, "Comprehensive Income." This ASU intends to enhance comparability and transparency of other comprehensive income components. The guidance provides an option to present total comprehensive income, the components of net income and the components of other comprehensive income in a single continuous statement or two separate but consecutive statements. This ASU eliminates the option to present other comprehensive income components as part of the statement of changes in shareowners' equity. The provisions of this ASU will be applied retrospectively for interim and annual periods beginning after December 15, 2011. Early application is permitted. Teradyne is currently evaluating the impact of this new ASU.

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Financial Instruments And Derivatives (Schedule Of Reported Financial Assets And Liabilities) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010	Jul. 03, 2011 Cash Equivalents [Member]	Dec. 31, 2010 Cash Equivalents [Member]	Jul. 03, 2011 Cash Equivalents [Member] Fair Value Inputs Level 1 [Member]	Dec. 31, 2010 Cash Equivalents [Member] Fair Value Inputs Level 1 [Member]	Jul. 03, 2011 Cash Equivalents [Member] Fair Value Inputs Level 2 [Member]	Dec. 31, 2010 Cash Equivalents [Member] Fair Value Inputs Level 2 [Member]	Jul. 03, 2011 Cash Equivalents [Member] Fair Value Inputs Level 3 [Member]	Apr. 04, 2010 UBS Put [Member] Fair Value Inputs Level 3 [Member]	Dec. 31, 2009 UBS Put [Member] Fair Value Inputs Level 3 [Member]	Jul. 03, 2011 Prepayments And Other Current Assets [Member]	Jul. 03, 2011 Prepayments And Other Current Assets [Member] Fair Value Inputs Level 1 [Member]	Jul. 03, 2011 Prepayments And Other Current Assets [Member] Fair Value Inputs Level 2 [Member]	Jul. 03, 2011 Prepayments And Other Current Assets [Member] Fair Value Inputs Level 3 [Member]	Jul. 03, 2011 Marketable Securities [Member]	Dec. 31, 2010 Marketable Securities [Member]	Jul. 03, 2011 Marketable Securities [Member] Fair Value Inputs Level 1 [Member]	Dec. 31, 2010 Marketable Securities [Member] Fair Value Inputs Level 1 [Member]	Jul. 03, 2011 Marketable Securities [Member] Fair Value Inputs Level 2 [Member]	Dec. 31, 2010 Marketable Securities [Member] Fair Value Inputs Level 2 [Member]	Jul. 03, 2011 Marketable Securities [Member] Fair Value Inputs Level 3 [Member]	Jul. 03, 2011 Long-Term Marketable Securities [Member]	Dec. 31, 2010 Long-Term Marketable Securities [Member]	Jul. 03, 2011 Long-Term Marketable Securities [Member] Fair Value Inputs Level 1 [Member]	Dec. 31, 2010 Long-Term Marketable Securities [Member] Fair Value Inputs Level 1 [Member]	Jul. 03, 2011 Long-Term Marketable Securities [Member] Fair Value Inputs Level 2 [Member]	Dec. 31, 2010 Long-Term Marketable Securities [Member] Fair Value Inputs Level 2 [Member]	Jul. 03, 2011 Long-Term Marketable Securities [Member] Fair Value Inputs Level 3 [Member]	Dec. 31, 2010 Other Accrued Liabilities [Member]	Dec. 31, 2010 Other Accrued Liabilities [Member] Fair Value Inputs Level 2 [Member]	Jul. 03, 2011 Fair Value Inputs Level 1 [Member]	Dec. 31, 2010 Fair Value Inputs Level 1 [Member]	Jul. 03, 2011 Fair Value Inputs Level 2 [Member]	Dec. 31, 2010 Fair Value Inputs Level 2 [Member]	Jul. 03, 2011 Fair Value Inputs Level 3 [Member]
Financial assets measured at fair value on a recurring basis	$ 1,049,693	$ 934,207	$ 313,638	$ 276,450	$ 288,944	$ 238,607	$ 24,694	$ 37,843		$ 2,687	$ 2,830	$ 135		$ 135		$ 453,942	$ 409,061	$ 64,529	$ 62,294	$ 389,413	$ 346,767		$ 281,978	$ 248,696	$ 82,978	$ 84,694	$ 199,000	$ 164,002				$ 436,451	$ 385,595	$ 613,242	$ 548,612
Financial liabilities measured at fair value on a recurring basis		$ 157																												$ 157	$ 157				$ 157

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Comprehensive Income (Tables)

6 Months Ended

Jul. 03, 2011

Comprehensive Income

Comprehensive Income

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Net income	$	89,058		$	122,149		$	183,930		$	172,249
Foreign currency translation adjustment		—			210			2,266			(363	)
Unrealized gains (losses) on investments, net of tax of $0, $0, $0 and $0		1,298			(401	)		1,313			296
Actuarial (losses) gains arising during period, net of tax of $10, $1,121, ($5) and $1,247		(4,150	)		17,202			(4,201	)		17,587
Amortization included in net periodic pension and post-retirement costs:
Actuarial losses, net of tax of $8, $44, $20 and $90		2,377			953			4,455			2,707
Prior service costs, net of tax of $0, $0, $0 and $0		6			122			12			246
Settlement loss net of tax of $38, $0, $73 and $0		217			—			277			—
Comprehensive income	$	88,806		$	140,235		$	188,052		$	192,722

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Restructuring And Other, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010 Q2 2009 Activity [Member]	Jul. 03, 2011 Pre-2010 Activities [Member] Systems Test Group [Member]	Jul. 04, 2010 Q1 2010 Activity [Member] Semiconductor Test [Member]	Jul. 03, 2011 Q2 2010 Activity [Member]	Jul. 04, 2010 Q2 2010 Activity [Member] Systems Test Group [Member]	Jul. 03, 2011 Q3 2010 Activity [Member]	Jul. 03, 2011 Q1 2011 Activity [Member] Semiconductor Test [Member]	Jul. 03, 2011 Q2 2011 Activity [Member] Semiconductor Test [Member]	Jul. 03, 2011 Non-U.S. Pension Settlement [Member]
Lease accruals payment	$ 0.9
Future lease commitments net of expected sublease income	0.8
Severance charges		0.5		0.4	0.2	0.4	0.1	0.6	0.3
Early exit of leased facility			(0.4)
Reduction in employees head count				4		6		5	2
Other charges related to non-U.S. pension settlement										$ 0.9
Lease expiration date	2013

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Retirement Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Discretionary contributions to the U.S. qualified pension plan			$ 4,400,000
Net Periodic Pension Cost [Member]
Service cost	668,000	921,000	1,493,000	1,952,000
Interest cost	4,459,000	4,268,000	8,849,000	8,816,000
Expected return on plan assets	(4,187,000)	(5,273,000)	(8,375,000)	(10,140,000)
Prior service cost	155,000	181,000	310,000	363,000
Net loss	2,341,000	1,022,000	4,386,000	2,768,000
Settlement	935,000		935,000
Total net periodic pension cost	4,371,000	1,119,000	7,598,000	3,759,000
Net Periodic Post-Retirement Cost [Member]
Service cost	14,000	7,000	30,000	27,000
Interest cost	134,000	174,000	269,000	392,000
Prior service cost	(150,000)	(59,000)	(299,000)	(117,000)
Net loss	45,000	(25,000)	90,000	29,000
Total net periodic pension cost	$ 43,000	$ 97,000	$ 90,000	$ 331,000

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Product Warranty (Schedule Of Extended Product Warranty) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Product Warranty
Balance at beginning of period	$ 9,870	$ 4,470	$ 8,972	$ 4,055
Deferral of new extended warranty revenue	1,861	1,581	3,798	3,215
Recognition of extended warranty deferred revenue	(1,423)	(408)	(2,462)	(1,627)
Balance at end of period	$ 10,308	$ 5,643	$ 10,308	$ 5,643

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Subsequent Event (Details) (USD $) In Millions, except Per Share data	1 Months Ended
	Aug. 09, 2011
Subsequent Event
Common stock repurchased during period, shares	1.5
Common stock repurchased during period, value	$ 17.8
Common stock repurchased during period, average price	$ 12.3

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Discontinued Operations

6 Months Ended

Jul. 03, 2011

Discontinued Operations

Discontinued Operations

D. Discontinued Operations

On March 21, 2011, Teradyne completed the sale of its Diagnostic Solutions business unit, which was included in the Systems Test Group segment, to SPX Corporation for $40.2 million in cash. Teradyne sold this business as its growth potential as a stand-alone business within Teradyne was significantly less than if it was part of a larger automotive supplier. The financial information for Diagnostic Solutions has been reclassified to discontinued operations for all periods presented. Net revenues and (loss) income from discontinued operations for the three and six months ended July 3, 2011 and July 4, 2010 were as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3,   2011			July 4,   2010			July 3, 2011		July 4, 2010
	(in thousands)
Net revenues	$	—		$	9,505		$	9,086	$	19,790
(Loss) Income from discontinued operations before income taxes	$	—		$	(381	)	$	1,278	$	620
(Loss) Gain from disposal of discontinued operations before income taxes		(832	)		—			28,949		—
Income tax provision		—			—			4,311		—
(Loss) Income from discontinued operations	$	(832	)	$	(381	)	$	25,916	$	620

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Financial Instruments And Derivatives (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) (USD $) In Thousands	Jul. 03, 2011		Dec. 31, 2010		Jul. 04, 2010	Dec. 31, 2009	Mar. 31, 2009
Marketable securities	$ 144,900		$ 185,300
Cash and cash equivalents	455,398		397,737		403,996	416,737
Convertible debt	149,873		144,059
Japan loan							10,000
Fair Value [Member]
Marketable securities	735,920		657,757
Cash and cash equivalents	313,638		276,450
Convertible debt	542,213	[1]	506,350	[1]
Japan loan	7,423		8,573
Carrying Value [Member]
Marketable securities	735,920		657,757
Cash and cash equivalents	313,638		276,450
Convertible debt	149,873	[1]	144,059	[1]
Japan loan	$ 7,423		$ 8,573

[1] The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.

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Deferred Revenue And Customer Advances (Tables)

6 Months Ended

Jul. 03, 2011

Deferred Revenue And Customer Advances

Schedule Of Deferred Revenue And Customer Advances

	July 3, 2011		December 31, 2010
	(in thousands)
Customer advances	$	105,696	$	132,559
Maintenance, training and extended warranty		34,739		36,626
Undelivered elements		7,401		5,858
Acceptance		951		2,083
Total deferred revenue and customer advances	$	148,787	$	177,126

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Segment Information (Schedule Of Segment Information) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jul. 03, 2011		Jul. 04, 2010		Jul. 03, 2011		Jul. 04, 2010
Net revenues	$ 410,519		$ 445,271		$ 787,680		$ 764,609
Income (loss) from continuing operations before income taxes	97,729	[1],[2]	132,073	[1],[2]	171,339	[1],[2]	186,002	[1],[2]
Semiconductor Test [Member]
Net revenues	343,096		413,059		662,346		702,736
Income (loss) from continuing operations before income taxes	92,477	[1],[2]	141,911	[1],[2]	167,893	[1],[2]	206,997	[1],[2]
Systems Test Group [Member]
Net revenues	67,423		32,212		125,334		61,873
Income (loss) from continuing operations before income taxes	9,125	[1],[2]	(5,845)	[1],[2]	14,313	[1],[2]	(11,472)	[1],[2]
Corporate And Eliminations [Member]
Income (loss) from continuing operations before income taxes	$ (3,873)	[1],[2]	$ (3,993)	[1],[2]	$ (10,867)	[1],[2]	$ (9,523)	[1],[2]

[1] Included in the income (loss) from continuing operations before income taxes for each of the segments are charges for the three months and six months ended July 3, 2011 and July 4, 2010 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows:

[2] Interest income and interest expense and other are included in Corporate and Eliminations.

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Net Income Per Common Share (Tables)

6 Months Ended

Jul. 03, 2011

Net Income Per Common Share

Schedule Of Computation Of Basic And Diluted Net Income (Loss) Per Common Share

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011		July 4, 2010
	(in thousands, except per share amounts)
Income from continuing operations	$	89,890		$	122,530		$	158,014	$	171,629
(Loss) Income from discontinued operations		—			(381	)		1,545		620
(Loss) Gain on disposal of discontinued operations		(832	)		—			24,371		—
Net income for basic net income per share	$	89,058		$	122,149		$	183,930	$	172,249
Income impact of assumed conversion of convertible notes		—			4,379			—		8,766
Net income for diluted net income per share	$	89,058		$	126,528		$	183,930	$	181,015
Weighted average common shares-basic		185,367			179,990			185,044		178,429
Effect of dilutive potential common shares:
Incremental shares from assumed conversion of convertible notes		22,711			34,703			23,036		34,703
Convertible note hedge warrant shares		17,914			11,225			18,368		10,174
Restricted stock units		3,877			2,924			4,222		2,896
Stock options		469			2,571			508		2,635
Employee stock purchase rights		114			128			88		72
Dilutive potential common shares		45,085			51,551			46,222		50,480
Weighted average common shares-diluted		230,452			231,541			231,266		228,909
Net income per common share-basic
Continuing operations	$	0.48		$	0.68		$	0.85	$	0.97
Discontinued operations		—			—			0.14		—
	$	0.48		$	0.68		$	0.99	$	0.97
Net income per common share-diluted
Continuing operations	$	0.39		$	0.55		$	0.68	$	0.79
Discontinued operations		—			—			0.12		—
	$	0.39		$	0.55		$	0.80	$	0.79

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Financial Instruments And Derivatives (Schedule Of Changes In Fair Value Of Level 3 Financial Assets) (Details) (USD $) In Thousands			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jul. 03, 2011	Dec. 31, 2010	Jul. 04, 2010 Long-Term Auction Rate Securities [Member] Fair Value Inputs Level 3 [Member]	Jul. 04, 2010 Long-Term Auction Rate Securities [Member] Fair Value Inputs Level 3 [Member]	Jul. 04, 2010 UBS Put [Member] Fair Value Inputs Level 3 [Member]	Jul. 04, 2010 UBS Put [Member] Fair Value Inputs Level 3 [Member]	Jul. 03, 2011 Fair Value Inputs Level 3 [Member]
Balance at beginning of period	$ 1,049,693	$ 934,207	$ 23,697	$ 23,649	$ 2,687	$ 2,830
Sale of auction rate securities and exercise of UBS Put			(20,863)	(21,013)	(2,687)	(2,687)
Change in unrealized gain included in interest income			2	200
Change in unrealized loss included in interest expense and other						(143)
Balance at end of period	$ 1,049,693	$ 934,207	$ 2,836	$ 2,836

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Stock-Based Compensation (Tables)

6 Months Ended

Jul. 03, 2011

Stock Options [Member]

Schedule Of Estimated Fair Value Of Stock Options Assumptions

	For the Six Months Ended
	July 3, 2011			July 4, 2010
Expected life (years)		4.00			4.75
Interest rate		1.5	%		2.4	%
Volatility-historical		52.1	%		48.8	%
Dividend yield		0.0	%		0.0	%

Stock Purchase Rights [Member]

Schedule Of Estimated Fair Value Of Stock Options Assumptions

	For the Six Months Ended
	July 3, 2011			July 4, 2010
Expected life (years)		0.5			0.5
Interest rate		0.19	%		0.18	%
Volatility-historical		41.5	%		45.5	%
Dividend yield		0.0	%		0.0	%

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Net Income Per Common Share

6 Months Ended

Jul. 03, 2011

Net Income Per Common Share

Net Income Per Common Share

L. Net Income per Common Share

The following table sets forth the computation of basic and diluted net income per common share:

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011		July 4, 2010
	(in thousands, except per share amounts)
Income from continuing operations	$	89,890		$	122,530		$	158,014	$	171,629
(Loss) Income from discontinued operations		—			(381	)		1,545		620
(Loss) Gain on disposal of discontinued operations		(832	)		—			24,371		—
Net income for basic net income per share	$	89,058		$	122,149		$	183,930	$	172,249
Income impact of assumed conversion of convertible notes		—			4,379			—		8,766
Net income for diluted net income per share	$	89,058		$	126,528		$	183,930	$	181,015
Weighted average common shares-basic		185,367			179,990			185,044		178,429
Effect of dilutive potential common shares:
Incremental shares from assumed conversion of convertible notes		22,711			34,703			23,036		34,703
Convertible note hedge warrant shares		17,914			11,225			18,368		10,174
Restricted stock units		3,877			2,924			4,222		2,896
Stock options		469			2,571			508		2,635
Employee stock purchase rights		114			128			88		72
Dilutive potential common shares		45,085			51,551			46,222		50,480
Weighted average common shares-diluted		230,452			231,541			231,266		228,909
Net income per common share-basic
Continuing operations	$	0.48		$	0.68		$	0.85	$	0.97
Discontinued operations		—			—			0.14		—
	$	0.48		$	0.68		$	0.99	$	0.97
Net income per common share-diluted
Continuing operations	$	0.39		$	0.55		$	0.68	$	0.79
Discontinued operations		—			—			0.12		—
	$	0.39		$	0.55		$	0.80	$	0.79

The computation of diluted net income per common share for the three and six months ended July 3, 2011 excludes the effect of the potential exercise of stock options to purchase approximately 0.5 million and 1.0 million shares, respectively, because the effect would have been anti-dilutive.

The computation of diluted net income per common share for the three and six months ended July 4, 2010 excludes the effect of the potential exercise of stock options to purchase approximately 4.5 million and 6.0 million shares and restricted stock units of 0.1 million and 0.4 million shares, respectively, because the effect would have been anti-dilutive.

With respect to the Teradyne's convertible debt, Teradyne intends to settle its conversion spread (i.e., the intrinsic value of the embedded option feature contained in the convertible debt) in shares. Teradyne accounts for its conversion spread using the treasury stock method. In the fourth quarter of 2010, Teradyne determined that it had the ability and intent to settle the principal amount of the convertible debt in cash, accordingly as of the fourth quarter of 2010, the principal amount has been excluded from the determination of diluted earnings per share.

Teradyne's call option on its common stock (convertible note hedge transaction) is excluded from the calculation of diluted shares because the effect would be anti-dilutive. See Note F "Debt" regarding convertible note hedge transaction.

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Intangible Assets (Schedule Of Estimated Intangible Asset Amortization Expense) (Details) (USD $) In Thousands	6 Months Ended
	Jul. 03, 2011
Intangible Assets
2011 (remainder)	$ 13,238
2012	25,732
2013	24,683
2014	21,598
2015	$ 4,575

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Commitments And Contingencies (Details) (USD $) In Millions	6 Months Ended
	Jul. 03, 2011
Commitments And Contingencies
Purchase commitments	$ 190.7
Purchase commitments maximum period	one year

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Financial Instruments And Derivatives

6 Months Ended

Jul. 03, 2011

Financial Instruments And Derivatives

Financial Instruments And Derivatives

E. Financial Instruments and Derivatives

Financial Instruments

Teradyne uses the market and income approach to value its financial instruments and there was no change in valuation techniques used by Teradyne during the six months ended July 3, 2011 and July 4, 2010. As defined in ASC 820-10, "Fair Value Measurements and Disclosures", fair value is the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. ASC 820-10 requires that assets and liabilities are carried at fair value and are classified in one of the following three categories:

Level 1: Quoted prices in active markets for identical assets as of the reporting date.

Level 2: Inputs other than Level 1, that are observable either directly or indirectly as of the reporting date. For example, a common approach for valuing fixed income securities is the use of matrix pricing. Matrix pricing is a mathematical technique used to value securities by relying on the securities' relationship to other benchmark quoted prices.

Level 3: Unobservable inputs that are not supported by market data. Unobservable inputs are developed based on the best information available, which might include Teradyne's own data.

For the right to sell the auction rate securities, held by Teradyne, back to UBS ("UBS Put"), Teradyne elected fair value treatment under ASC 825-10, "Financial Instruments." The UBS Put was the only instrument of this nature or type that Teradyne held and for which Teradyne has elected the fair value option under ASC 825-10. The UBS Put was exercised in June 2010.

During the six months ended July 3, 2011 and July 4, 2010, there were no significant transfers in and out of Level 1 and Level 2.

The following table sets forth by fair value hierarchy Teradyne's financial assets and liabilities that were measured at fair value on a recurring basis as of July 3, 2011 and December 31, 2010.

	July 3, 2011
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Available for sale securities:
Money market funds	$	288,944	$	—	$	—	$	288,944
U.S. government agency securities		—		240,102		—		240,102
Commercial paper		—		235,540		—		235,540
U.S. Treasury securities		138,455		—		—		138,455
Corporate debt securities		—		129,084		—		129,084
Equity and debt mutual funds		8,754		—		—		8,754
Certificates of deposit and time deposits		—		8,381		—		8,381
Non-U.S. government securities		298		—		—		298
Total		436,451		613,107		—		1,049,558
Derivatives		—		135		—		135
Total	$	436,451	$	613,242	$	—	$	1,049,693

Reported as follows:

	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	288,944	$	24,694	$	—	$	313,638
Marketable securities		64,529		389,413		—		453,942
Long-term marketable securities		82,978		199,000		—		281,978
Prepayments and other current assets		—		135		—		135
	$	436,451	$	613,242	$	—	$	1,049,693

	December 31, 2010
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in thousands)
Assets
Available for sale securities:
U.S. government agency securities	$	—	$	341,510	$	—	$	341,510
Money market funds		238,607		—		—		238,607
U.S. Treasury securities		138,707		—		—		138,707
Commercial paper		—		103,448		—		103,448
Corporate debt securities		—		92,578		—		92,578
Certificates of deposit and time deposits		—		11,076		—		11,076
Equity and debt mutual funds		8,003		—		—		8,003
Non-U.S. government securities		278		—		—		278
Total	$	385,595	$	548,612	$	—	$	934,207
Liabilities
Derivatives	$	—	$	157	$	—	$	157
Total	$	—	$	157	$	—	$	157

Reported as follows:

	(Level 1)		(Level 2)		(Level 3)		Total
	(in thousands)
Assets
Cash and cash equivalents	$	238,607	$	37,843	$	—	$	276,450
Marketable securities		62,294		346,767		—		409,061
Long-term marketable securities		84,694		164,002		—		248,696
	$	385,595	$	548,612	$	—	$	934,207
Liabilities
Other accrued liabilities	$	—	$	157	$	—	$	157

The following table represents changes in the fair value of Level 3 financial assets:

	For the Three Months Ended
	July 3, 2011				July 4, 2010
	Long-Term Auction Rate Securities		UBS Put		Long-Term Auction Rate Securities			UBS Put
	(in thousands)
Balance at beginning of period	$	—	$	—	$	23,697		$	2,687
Sale of auction rate securities and exercise of UBS Put		—		—		(20,863	)		(2,687	)
Change in unrealized gain included in interest income		—		—		2			—
Balance at end of period	$	—	$	—	$	2,836		$	—
	For the Six Months Ended
	July 3, 2011				July 4, 2010
	Long-Term Auction Rate Securities		UBS Put		Long-Term Auction Rate Securities			UBS Put
	(in thousands)
Balance at beginning of period	$	—	$	—	$	23,649		$	2,830
Sale of auction rate securities and exercise of UBS Put		—		—		(21,013	)		(2,687	)
Change in unrealized gain included in interest income		—		—		200			—
Change in unrealized loss included in interest expense and other		—		—		—			(143	)
Balance at end of period	$	—	$	—	$	2,836		$	—

During the three and six months ended July 3, 2011, Teradyne recorded a net gain of $0.1 million and a net loss $0.1 million, respectively, from sales of marketable securities. During the three and six months ended July 4, 2010, Teradyne recorded a loss of $0.1 million and $0.4 million, respectively, from sales of marketable securities and exercise of UBS Put.

Realized losses from sales of marketable securities, decreases in auction rate securities fair value and other-than-temporary impairment losses are included in interest expense and other. Realized gains from sales of marketable securities and increases in auction rate securities fair value are included in interest income.

The carrying amounts and fair values of financial instruments at July 3, 2011 and December 31, 2010 were as follows:

	July 3, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Marketable securities	$	735,920	$	735,920	$	657,757	$	657,757
Cash equivalents		313,638		313,638		276,450		276,450
Convertible debt(1)		149,873		542,213		144,059		506,350
Japan loan		7,423		7,423		8,573		8,573

(1) The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.

The fair values of cash, accounts receivable, net and accounts payable approximate the carrying amount due to the short term maturities of these instruments.

The following table summarizes available-for-sale marketable securities which are recorded at fair value:

	July 3, 2011
	Available-for-Sale									Fair Market Value of Investments with Unrealized  Losses
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value
	(in thousands)
Money market funds	$	288,944	$	—	$	—		$	288,944	$	—
U.S. government agency securities		239,366		764		(28	)		240,102		30,074
Commercial paper		235,556		17		(33	)		235,540		48,880
U.S. Treasury securities		137,934		533		(12	)		138,455		28,665
Corporate debt securities		128,664		497		(77	)		129,084		37,248
Equity and debt mutual funds		7,518		1,236		—			8,754		—
Certificates of deposit and time deposits		8,365		16		—			8,381		—
Non-U.S. government securities		298		—		—			298		—
	$	1,046,645	$	3,063	$	(150	)	$	1,049,558	$	144,867

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Cash and cash equivalents	$	313,639	$	—	$	(1	)	$	313,638	$	10,946
Marketable securities		453,619		367		(44	)		453,942		61,468
Long-term marketable securities		279,387		2,696		(105	)		281,978		72,453
	$	1,046,645	$	3,063	$	(150	)	$	1,049,558	$	144,867

	December 31, 2010
	Available-for-Sale									Fair Market Value of Investments with Unrealized  Losses
	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value
	(in thousands)
U.S. government agency securities	$	341,349	$	334	$	(173	)	$	341,510	$	97,542
Money market funds		238,607		—		—			238,607		—
U.S. Treasury securities		138,354		360		(7	)		138,707		10,030
Commercial paper		103,472		1		(25	)		103,448		33,210
Corporate debt securities		92,464		170		(56	)		92,578		43,434
Certificates of deposit and time deposits		11,068		8		—			11,076		—
Equity and debt mutual funds		7,056		1,378		(431	)		8,003		1,088
Non-U.S. government securities		261		17		—			278		—
	$	932,631	$	2,268	$	(692	)	$	934,207	$	185,304

Reported as follows:

	Cost		Unrealized Gain		Unrealized (Loss)			Fair Market Value		Fair Market Value of Investments with Unrealized Losses
	(in thousands)
Cash and cash equivalents	$	276,447	$	3	$	—		$	276,450	$	—
Marketable securities		408,934		178		(51	)		409,061		103,761
Long-term marketable securities		247,250		2,087		(641	)		248,696		81,543
	$	932,631	$	2,268	$	(692	)	$	934,207	$	185,304

On a quarterly basis, Teradyne reviews its investments to identify and evaluate those that have an indication of a potential other-than-temporary impairment. Factors considered in determining whether a loss is other-than-temporary include:

• The length of time and the extent to which the market value has been less than cost;

• The financial condition and near-term prospects of the issuer; and

• The intent and ability to retain the investment in the issuer for a period of time sufficient to allow for any anticipated recovery in market value.

As of July 3, 2011, the fair market value of investments with unrealized losses less than one year totaled $144.9 million. There were no unrealized losses greater than one year. As of December 31, 2010, the fair market value of investments with unrealized losses totaled $185.3 million. Of this value, $5.0 million had unrealized losses greater than one year and $180.3 million had unrealized losses less than one year.

Derivatives

Teradyne conducts business in a number of foreign countries, with certain transactions denominated in local currencies. The purpose of Teradyne's foreign currency management is to minimize the effect of exchange rate fluctuations on certain foreign denominated net monetary assets. Teradyne does not use derivative financial instruments for trading or speculative purposes.

To minimize the effect of exchange rate fluctuations associated with the remeasurement of net monetary assets and liabilities denominated in foreign currencies, Teradyne enters into foreign currency forward contracts. The change in fair value of these derivatives is recorded directly in earnings, and is used to offset the change in fair value of the net monetary assets and liabilities denominated in foreign currencies.

The notional amount of foreign exchange contracts hedging monetary assets and liabilities denominated in foreign currencies was $49.5 million and $48.3 million at July 3, 2011 and December 31, 2010, respectively.

The following table summarizes the fair value of derivative instruments at July 3, 2011 and December 31, 2010.

	Balance Sheet Location	July 3, 2011		December 31, 2010
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Prepayments and other current assets	$	135	$	—
Foreign exchange contracts	Other accrued liabilities		—		157
		$	135	$	157

The following table summarizes the effect of derivative instruments in the statement of operations recognized during the three and six months ended July 3, 2011 and July 4, 2010. The table does not reflect the corresponding gains (losses) from the remeasurement of the monetary assets and liabilities denominated in foreign currencies.

	Location of Gains (Losses) Recognized in Statement of Operations	For the Three Months Ended						For the Six Months Ended
		July 3, 2011			July 4, 2010			July 3, 2011		July 4, 2010
		(in thousands)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Interest expense and other	$	(166	)	$	(574	)	$	660	$	(1,260	)
		$	(166	)	$	(574	)	$	660	$	(1,260	)

See Note F "Debt" regarding derivatives related to convertible senior notes.

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Commitments And Contingencies

6 Months Ended

Jul. 03, 2011

Commitments And Contingencies

Commitments And Contingencies

O. Commitments and Contingencies

Purchase Commitments

As of July 3, 2011, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments are for less than one year and aggregate to approximately $190.7 million.

Legal Claims

Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on Teradyne's results of operations, financial condition or cash flows.

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Segment Information (Schedule Of Segment Reporting Information By Segment Charges) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Semiconductor Test [Member]
Cost of revenues-provision for excess and obsolete inventory	$ 1,500		$ 5,942	$ 496
Restructuring and other, net	1,279		2,170	1,082
Total	2,779		8,112	1,578
Systems Test Group [Member]
Cost of revenues-provision for excess and obsolete inventory	216	276	401	958
Restructuring and other, net		408	(246)	229
Total	216	684	155	1,187
Corporate And Eliminations [Member]
Restructuring and other, net		(37)	(232)	(37)
Total		$ (37)	$ (232)	$ (37)

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Financial Instruments And Derivatives (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Available for sale securities	$ 1,049,558	$ 934,207
Derivatives, assets	135
Financial assets measured at fair value on a recurring basis	1,049,693	934,207
Derivatives, liabilities		157
Financial liabilities measured at fair value on a recurring basis		157
U.S. Government Agency Securities [Member]
Available for sale securities	240,102	341,510
U.S. Government Agency Securities [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities
U.S. Government Agency Securities [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities	240,102	341,510
U.S. Government Agency Securities [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Money Market Funds [Member]
Available for sale securities	288,944	238,607
Money Market Funds [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities	288,944	238,607
Money Market Funds [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities
Money Market Funds [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
U.S. Treasury Securities [Member]
Available for sale securities	138,455	138,707
U.S. Treasury Securities [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities	138,455	138,707
U.S. Treasury Securities [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities
U.S. Treasury Securities [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Commercial Paper [Member]
Available for sale securities	235,540	103,448
Commercial Paper [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities
Commercial Paper [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities	235,540	103,448
Commercial Paper [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Corporate Debt Securities [Member]
Available for sale securities	129,084	92,578
Corporate Debt Securities [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities
Corporate Debt Securities [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities	129,084	92,578
Corporate Debt Securities [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Certificates Of Deposit And Time Deposits [Member]
Available for sale securities	8,381	11,076
Certificates Of Deposit And Time Deposits [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities
Certificates Of Deposit And Time Deposits [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities	8,381	11,076
Certificates Of Deposit And Time Deposits [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Equity And Debt Mutual Funds [Member]
Available for sale securities	8,754	8,003
Equity And Debt Mutual Funds [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities	8,754	8,003
Equity And Debt Mutual Funds [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities
Equity And Debt Mutual Funds [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Non-U.S. Government Securities [Member]
Available for sale securities	298	278
Non-U.S. Government Securities [Member] | Fair Value Inputs Level 1 [Member]
Available for sale securities	298	278
Non-U.S. Government Securities [Member] | Fair Value Inputs Level 2 [Member]
Available for sale securities
Non-U.S. Government Securities [Member] | Fair Value Inputs Level 3 [Member]
Available for sale securities
Fair Value Inputs Level 1 [Member]
Available for sale securities	436,451	385,595
Derivatives, assets
Financial assets measured at fair value on a recurring basis	436,451	385,595
Fair Value Inputs Level 2 [Member]
Available for sale securities	613,107	548,612
Derivatives, assets	135
Financial assets measured at fair value on a recurring basis	613,242	548,612
Derivatives, liabilities		157
Financial liabilities measured at fair value on a recurring basis		157
Fair Value Inputs Level 3 [Member]
Available for sale securities
Derivatives, assets
Financial assets measured at fair value on a recurring basis

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Product Warranty (Tables)

6 Months Ended

Jul. 03, 2011

Product Warranty

Schedule Of Product Warranty

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Balance at beginning of period	$	9,502		$	8,339		$	9,886		$	6,435
Accruals for warranties issued during the period		3,976			5,202			7,553			8,857
Adjustments related to pre-existing warranties		(1,116	)		(234	)		(2,072	)		354
Settlements made during the period		(3,100	)		(2,671	)		(6,105	)		(5,010	)
Balance at end of period	$	9,262		$	10,636		$	9,262		$	10,636

Schedule Of Extended Product Warranty

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Balance at beginning of period	$	9,870		$	4,470		$	8,972		$	4,055
Deferral of new extended warranty revenue		1,861			1,581			3,798			3,215
Recognition of extended warranty deferred revenue		(1,423	)		(408	)		(2,462	)		(1,627	)
Balance at end of period	$	10,308		$	5,643		$	10,308		$	5,643

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Condensed Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Condensed Consolidated Statements Of Operations
(Loss) Gain on disposal of discontinued operations, income tax	$ 0	$ 0	$ 4,578	$ 0

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Segment Information

6 Months Ended

Jul. 03, 2011

Segment Information

Segment Information

P. Segment Information

Teradyne's two reportable segments are Semiconductor Test and Systems Test Group. The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The Systems Test Group segment includes operations related to the design, manufacturing and marketing of products and services for military/aerospace instrumentation test, hard disk drive test and circuit-board test and inspection.

Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income before income taxes. The accounting policies of the business segments are the same as those described in Note B "Accounting Policies" in Teradyne's Annual Report on Form 10-K for the year ended December 31, 2010. Segment information is as follows:

	Semiconductor Test		Systems Test Group			Corporate and Eliminations			Consolidated
	(in thousands)
Three months ended July 3, 2011:
Net revenues	$	343,096	$	67,423		$	—		$	410,519
Income (loss) from continuing operations before income taxes(1)(2)		92,477		9,125			(3,873	)		97,729
Three months ended July 4, 2010:
Net revenues	$	413,059	$	32,212		$	—		$	445,271
Income (loss) from continuing operations before income taxes(1)(2)		141,911		(5,845	)		(3,993	)		132,073
Six months ended July 3, 2011:
Net revenues	$	662,346	$	125,334		$	—		$	787,680
Income (loss) from continuing operations before income taxes(1)(2)		167,893		14,313			(10,867	)		171,339
Six months ended July 4, 2010:
Net revenues	$	702,736	$	61,873		$	—		$	764,609
Income (loss) from continuing operations before income taxes(1)(2)		206,997		(11,472	)		(9,523	)		186,002

(1) Interest income and interest expense and other are included in Corporate and Eliminations.

(2) Included in the income (loss) from continuing operations before income taxes for each of the segments are charges for the three months and six months ended July 3, 2011 and July 4, 2010 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows:

Included in the Semiconductor Test segment are charges for the following:

	For the Three Months Ended				For the Six Months Ended
	July 3,   2011		July 4,   2010		July 3, 2011		July 4, 2010
	(in thousands)
Cost of revenues—provision for excess and obsolete inventory	$	1,500	$	—	$	5,942	$	496
Restructuring and other, net		1,279		—		2,170		1,082
Total	$	2,779	$	—	$	8,112	$	1,578

Included in the Systems Test Group segment are charges for the following:

	For the Three Months Ended				For the Six Months Ended
	July 3, 2011		July 4, 2010		July 3, 2011			July 4, 2010
	(in thousands)
Cost of revenues—provision for excess and obsolete inventory	$	216	$	276	$	401		$	958
Restructuring and other, net		—		408		(246	)		229
Total	$	216	$	684	$	155		$	1,187

Included in the Corporate and Eliminations segment are charges for the following:

	For the Three Months Ended					For the Six Months Ended
	July 3, 2011		July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Restructuring and other, net	$	—	$	(37	)	$	(232	)	$	(37	)
Total	$	—	$	(37	)	$	(232	)	$	(37	)

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Financial Instruments And Derivatives (Schedule Of Reported Available-For-Sale Marketable Securities) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Available-for-sale marketable securities, Cost	$ 1,046,645	$ 932,631
Available-for-sale Securities, Unrealized Gain	3,063	2,268
Available-for-sale marketable securities, Unrealized (Loss)	(150)	(692)
Available-for-sale marketable securities, Fair Market Value	1,049,558	934,207
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	144,867	185,304
Cash Equivalents [Member]
Available-for-sale marketable securities, Cost	313,639	276,447
Available-for-sale Securities, Unrealized Gain		3
Available-for-sale marketable securities, Unrealized (Loss)	(1)
Available-for-sale marketable securities, Fair Market Value	313,638	276,450
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	10,946
Marketable Securities [Member]
Available-for-sale marketable securities, Cost	453,619	408,934
Available-for-sale Securities, Unrealized Gain	367	178
Available-for-sale marketable securities, Unrealized (Loss)	(44)	(51)
Available-for-sale marketable securities, Fair Market Value	453,942	409,061
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	61,468	103,761
Long-Term Marketable Securities [Member]
Available-for-sale marketable securities, Cost	279,387	247,250
Available-for-sale Securities, Unrealized Gain	2,696	2,087
Available-for-sale marketable securities, Unrealized (Loss)	(105)	(641)
Available-for-sale marketable securities, Fair Market Value	281,978	248,696
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 72,453	$ 81,543

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Accounting Policies (Policy)

6 Months Ended

Jul. 03, 2011

Accounting Policies

Basis Of Presentation

Basis of Presentation

The condensed consolidated interim financial statements include the accounts of Teradyne and its subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair presentation of such interim financial statements. Certain prior year's amounts were reclassified to conform to the current year presentation. The December 31, 2010 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.

The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne's Annual Report on Form 10-K, filed with the SEC on March 1, 2011 for the year ended December 31, 2010.

On March 21, 2011, Teradyne completed the sale of Diagnostic Solutions, its automotive diagnostic and test business unit. The results of operations of Diagnostic Solutions as well as balance sheet and cash flow amounts pertaining to this business have been classified as discontinued operations in the condensed consolidated financial statements (see Note D "Discontinued Operations").

Preparation of Financial Statements

Preparation Of Financial Statements

The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts reported in the financial statements. Actual results may differ significantly from these estimates.

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The Company

6 Months Ended

Jul. 03, 2011

The Company

The Company

A. The Company

Teradyne, Inc. ("Teradyne") is a leading global supplier of automatic test equipment. Teradyne's automatic test equipment products and services include:

• semiconductor test ("Semiconductor Test") systems; and

• military/aerospace ("Mil/Aero") test instrumentation and systems, hard disk drive test ("HDD") systems, and circuit-board test and inspection ("Commercial Board Test") systems (collectively these products represent "Systems Test Group").

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Comprehensive Income

6 Months Ended

Jul. 03, 2011

Comprehensive Income

Comprehensive Income

J. Comprehensive Income

Comprehensive income is calculated as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Net income	$	89,058		$	122,149		$	183,930		$	172,249
Foreign currency translation adjustment		—			210			2,266			(363	)
Unrealized gains (losses) on investments, net of tax of $0, $0, $0 and $0		1,298			(401	)		1,313			296
Actuarial (losses) gains arising during period, net of tax of $10, $1,121, ($5) and $1,247		(4,150	)		17,202			(4,201	)		17,587
Amortization included in net periodic pension and post-retirement costs:
Actuarial losses, net of tax of $8, $44, $20 and $90		2,377			953			4,455			2,707
Prior service costs, net of tax of $0, $0, $0 and $0		6			122			12			246
Settlement loss net of tax of $38, $0, $73 and $0		217			—			277			—
Comprehensive income	$	88,806		$	140,235		$	188,052		$	192,722

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Intangible Assets (Schedule Of Amortizable Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010	Dec. 31, 2010
Gross Carrying Amount	$ 227,466,000		$ 227,466,000		$ 227,466,000
Accumulated Amortization	119,109,000		119,109,000		104,525,000
Net Carrying Amount	108,357,000		108,357,000		122,941,000
Weighted Average Useful Life, Years			7.6		7.6
Aggregate intangible asset amortization expense	7,300,000	7,300,000	14,600,000	14,700,000
Developed Technology [Member]
Gross Carrying Amount	121,055,000		121,055,000		121,055,000
Accumulated Amortization	74,500,000		74,500,000		65,610,000
Net Carrying Amount	46,555,000		46,555,000		55,445,000
Weighted Average Useful Life, Years			6.1		6.1
Customer Relationships And Service And Software Maintenance Contracts [Member]
Gross Carrying Amount	91,271,000		91,271,000		91,271,000
Accumulated Amortization	38,030,000		38,030,000		32,749,000
Net Carrying Amount	53,241,000		53,241,000		58,522,000
Weighted Average Useful Life, Years			8.6		8.6
Trade Names And Trademarks [Member]
Gross Carrying Amount	14,840,000		14,840,000		14,840,000
Accumulated Amortization	6,279,000		6,279,000		5,866,000
Net Carrying Amount	8,561,000		8,561,000		8,974,000
Weighted Average Useful Life, Years			11.5		11.5
Customer Backlog [ Member ]
Gross Carrying Amount	300,000		300,000		300,000
Accumulated Amortization	$ 300,000		$ 300,000		$ 300,000
Weighted Average Useful Life, Years			0.5		0.5

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Restructuring And Other, Net (Schedule Of Restructuring And Other, Net) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 03, 2011	Jul. 03, 2011	Dec. 31, 2010
Ending Balance		$ 2,847
Pre-2010 Activities [Member]
Beginning Balance	3,322	3,322	13,071
Change in estimate	(432)		(2,432)
Cash payments	(263)	(301)	(7,317)
Ending Balance	2,627	2,326	3,322
Pre-2010 Activities [Member] | Severance And Benefits [Member]
Beginning Balance	21	21	2,905
Change in estimate			240
Cash payments	(21)		(3,124)
Ending Balance			21
Pre-2010 Activities [Member] | Facility Exit Costs [Member]
Beginning Balance	3,301	3,301	10,166
Change in estimate	(432)		(2,672)
Cash payments	(242)	(301)	(4,193)
Ending Balance	2,627	2,326	3,301
Q1 2010 Activity [Member]
Provision			405
Cash payments			(405)
Q1 2010 Activity [Member] | Severance And Benefits [Member]
Provision			405
Cash payments			(405)
Q2 2010 Activity [Member]
Beginning Balance	488	488
Provision	202		890
Cash payments	(690)		(402)
Ending Balance			488
Q2 2010 Activity [Member] | Severance And Benefits [Member]
Beginning Balance	488	488
Provision	202		890
Cash payments	(690)		(402)
Ending Balance			488
Q3 2010 Activity [Member]
Beginning Balance	126	126
Provision			382
Change in estimate	(47)
Cash payments	(79)		(72)
Other			(184)
Ending Balance			126
Q3 2010 Activity [Member] | Severance And Benefits [Member]
Beginning Balance	126	126
Provision			382
Change in estimate	(47)
Cash payments	(79)		(72)
Other			(184)
Ending Balance			126
Q4 2010 Activity [Member]
Beginning Balance	98	98
Provision	117		98
Cash payments	(215)
Ending Balance			98
Q4 2010 Activity [Member] | Severance And Benefits [Member]
Beginning Balance	98	98
Provision	117		98
Cash payments	(215)
Ending Balance			98
Q1 2011 Activity [Member]
Provision	572
Cash payments	(241)	(154)
Ending Balance	331	177
Q1 2011 Activity [Member] | Severance And Benefits [Member]
Provision	572
Cash payments	(241)	(154)
Ending Balance	331	177
Q2 2011 Activity [Member]
Provision		344
Ending Balance		344
Q2 2011 Activity [Member] | Severance And Benefits [Member]
Provision		344
Ending Balance		344
Severance And Benefits [Member]
Ending Balance		521
Facility Exit Costs [Member]
Ending Balance		$ 2,326

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Restructuring And Other, Net (Tables)

6 Months Ended

Jul. 03, 2011

Restructuring And Other, Net

Schedule Of Restructuring And Other, Net

	Severance and Benefits			Facility Exit Costs			Total
	(in thousands)
Pre-2010 Activities
Balance at December 31, 2009	$	2,905		$	10,166		$	13,071
Change in estimate		240			(2,672	)		(2,432	)
Cash payments		(3,124	)		(4,193	)		(7,317	)
Balance at December 31, 2010		21			3,301			3,322
Change in estimate		—			(432	)		(432	)
Cash payments		(21	)		(242	)		(263	)
Balance at April 3, 2011		—			2,627			2,627
Cash payments		—			(301	)		(301	)
Balance at July 3, 2011	$	—		$	2,326		$	2,326
2010 Activities
Q1 2010 Activity:
Provision	$	405		$	—		$	405
Cash payments		(405	)		—			(405	)
Balance at December 31, 2010	$	—		$	—		$	—
Q2 2010 Activity:
Provision	$	890		$	—		$	890
Cash payments		(402	)		—			(402	)
Balance at December 31, 2010		488			—			488
Provision		202			—			202
Cash payments		(690	)		—			(690	)
Balance at April 3, 2011	$	—		$	—		$	—
Q3 2010 Activity:
Provision	$	382		$	—		$	382
Cash payments		(72	)		—			(72	)
Other		(184	)		—			(184	)
Balance at December 31, 2010		126			—			126
Change in estimate		(47	)		—			(47	)
Cash payments		(79	)		—			(79	)
Balance at April 3, 2011	$	—		$	—		$	—
Q4 2010 Activity:
Provision	$	98		$	—		$	98
Balance at December 31, 2010		98			—			98
Provision		117			—			117
Cash payments		(215	)		—			(215	)
Balance at April 3, 2011	$	—		$	—		$	—
2011 Activity
Q1 2011 Activity:
Provision	$	572		$	—		$	572
Cash payments		(241	)		—			(241	)
Balance at April 3, 2011		331			—			331
Cash payments		(154	)		—			(154	)
Balance at July 3, 2011	$	177		$	—		$	177
Q2 2011 Activity:
Provision	$	344		$	—		$	344
Balance at July 3, 2011	$	344		$	—		$	344
Balance at July 3, 2011	$	521		$	2,326		$	2,847

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Retirement Plans

6 Months Ended

Jul. 03, 2011

Retirement Plans

Retirement Plans

N. Retirement Plans

Defined Benefit Pension Plans

Teradyne has defined benefit pension plans covering a portion of domestic employees and employees of certain non-U.S. subsidiaries. Benefits under these plans are based on employees' years of service and compensation. Teradyne's funding policy is to make contributions to these plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of these plans consist primarily of equity and fixed income securities. In addition, Teradyne has foreign unfunded defined benefit pension plans and an unfunded supplemental executive defined benefit plan in the United States to provide retirement benefits in excess of levels allowed by the Employment Retirement Income Security Act and the Internal Revenue Code.

Components of net periodic pension cost for all plans were as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3,  2011			July 4,  2010			July 3,  2011			July 4,  2010
	(in thousands)
Service cost	$	668		$	921		$	1,493		$	1,952
Interest cost		4,459			4,268			8,849			8,816
Expected return on plan assets		(4,187	)		(5,273	)		(8,375	)		(10,140	)
Amortization of unrecognized:
Prior service cost		155			181			310			363
Net loss		2,341			1,022			4,386			2,768
Settlement		935			—			935			—
Total net periodic pension cost	$	4,371		$	1,119		$	7,598		$	3,759

In the six months ended July 3, 2011, Teradyne contributed $4.4 million primarily to its foreign pension plans.

Post-Retirement Benefit Plans

In addition to receiving pension benefits, U.S. Teradyne employees who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne's Welfare Plan, which includes death, and medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees' survivors and are available to all retirees. Substantially all of Teradyne's current U.S. employees could become eligible for these benefits, and the existing benefit obligation relates primarily to those employees.

Components of net periodic post-retirement cost were as follows:

	For the Three Months Ended						For the Six Months Ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Service cost	$	14		$	7		$	30		$	27
Interest cost		134			174			269			392
Amortization of unrecognized:
Prior service benefit		(150	)		(59	)		(299	)		(117	)
Net loss		45			(25	)		90			29
Total net periodic post-retirement cost	$	43		$	97		$	90		$	331

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Condensed Consolidated Balance Sheets (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 455,398	$ 397,737
Marketable securities	453,942	409,061
Accounts receivable, net of allowance for doubtful accounts of $4,097 and $3,752 at July 3, 2011 and December 31, 2010, respectively	207,823	168,756
Inventories:
Parts	90,964	78,109
Assemblies in process	21,039	16,013
Finished goods	29,515	22,719
Inventory, net, total	141,518	116,841
Deferred tax assets	22,801	22,730
Prepayments and other current assets	61,946	52,780
Current assets from discontinued operations		8,713
Total current assets	1,343,428	1,176,618
Property, plant and equipment, at cost	795,778	773,374
Less: accumulated depreciation	562,346	542,266
Net property, plant and equipment	233,432	231,108
Long-term marketable securities	281,978	248,696
Retirement plan assets	14,456	13,981
Intangible assets, net	108,357	122,941
Other assets	16,644	16,542
Long-term assets from discontinued operations		469
Total assets	1,998,295	1,810,355
Current liabilities:
Accounts payable	106,993	81,142
Accrued employees' compensation and withholdings	75,018	105,374
Deferred revenue and customer advances	98,723	105,568
Other accrued liabilities	59,889	57,145
Accrued income taxes	9,888	8,465
Current debt	2,475	2,450
Current liabilities from discontinued operations		3,560
Total current liabilities	352,986	363,704
Long-term deferred revenue and customer advances	50,064	71,558
Retirement plan liabilities	77,154	72,071
Deferred tax liabilities	9,973	9,849
Long-term other accrued liabilities	19,359	19,448
Long-term debt	154,821	150,182
Long-term liabilities of discontinued operations		1,355
Total liabilities	664,357	688,167
Commitments and contingencies (Note O)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 186,002 shares and 182,035 shares issued and outstanding at July 3, 2011 and December 31, 2010, respectively	23,250	22,755
Additional paid-in capital	1,292,727	1,269,525
Accumulated other comprehensive loss	(124,094)	(128,216)
Retained earnings (accumulated deficit)	142,055	(41,876)
Total shareholders' equity	1,333,938	1,122,188
Total liabilities and shareholders' equity	$ 1,998,295	$ 1,810,355

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Segment Information (Tables)

6 Months Ended

Jul. 03, 2011

Schedule Of Segment Information

	Semiconductor Test		Systems Test Group			Corporate and Eliminations			Consolidated
	(in thousands)
Three months ended July 3, 2011:
Net revenues	$	343,096	$	67,423		$	—		$	410,519
Income (loss) from continuing operations before income taxes(1)(2)		92,477		9,125			(3,873	)		97,729
Three months ended July 4, 2010:
Net revenues	$	413,059	$	32,212		$	—		$	445,271
Income (loss) from continuing operations before income taxes(1)(2)		141,911		(5,845	)		(3,993	)		132,073
Six months ended July 3, 2011:
Net revenues	$	662,346	$	125,334		$	—		$	787,680
Income (loss) from continuing operations before income taxes(1)(2)		167,893		14,313			(10,867	)		171,339
Six months ended July 4, 2010:
Net revenues	$	702,736	$	61,873		$	—		$	764,609
Income (loss) from continuing operations before income taxes(1)(2)		206,997		(11,472	)		(9,523	)		186,002

(1) Interest income and interest expense and other are included in Corporate and Eliminations.

(2) Included in the income (loss) from continuing operations before income taxes for each of the segments are charges for the three months and six months ended July 3, 2011 and July 4, 2010 that include restructuring and other, net, and provision for excess and obsolete inventory, as follows:

Semiconductor Test [Member]

Schedule Of Segment Reporting Information By Segment Charges

	For the Three Months Ended				For the Six Months Ended
	July 3,   2011		July 4,   2010		July 3, 2011		July 4, 2010
	(in thousands)
Cost of revenues—provision for excess and obsolete inventory	$	1,500	$	—	$	5,942	$	496
Restructuring and other, net		1,279		—		2,170		1,082
Total	$	2,779	$	—	$	8,112	$	1,578

Systems Test Group [Member]

Schedule Of Segment Reporting Information By Segment Charges

	For the Three Months Ended				For the Six Months Ended
	July 3, 2011		July 4, 2010		July 3, 2011			July 4, 2010
	(in thousands)
Cost of revenues—provision for excess and obsolete inventory	$	216	$	276	$	401		$	958
Restructuring and other, net		—		408		(246	)		229
Total	$	216	$	684	$	155		$	1,187

Corporate And Eliminations [Member]

Schedule Of Segment Reporting Information By Segment Charges

	For the Three Months Ended					For the Six Months Ended
	July 3, 2011		July 4, 2010			July 3, 2011			July 4, 2010
	(in thousands)
Restructuring and other, net	$	—	$	(37	)	$	(232	)	$	(37	)
Total	$	—	$	(37	)	$	(232	)	$	(37	)

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Deferred Revenue And Customer Advances (Schedule Of Deferred Revenue And Customer Advances) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Deferred Revenue And Customer Advances
Customer advances	$ 105,696	$ 132,559
Maintenance, training and extended warranty	34,739	36,626
Undelivered elements	7,401	5,858
Acceptance	951	2,083
Total deferred revenue and customer advances	$ 148,787	$ 177,126

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Net Income Per Common Share (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Income from continuing operations	$ 89,890	$ 122,530	$ 158,014	$ 171,629
(Loss) Income from discontinued operations		(381)	1,545	620
(Loss) Gain on disposal of discontinued operations	(832)		24,371
Net income	89,058	122,149	183,930	172,249
Income impact of assumed conversion of convertible notes		4,379		8,766
Net income for diluted net income per share	$ 89,058	$ 126,528	$ 183,930	$ 181,015
Weighted average common shares-basic	185,367,000	179,990,000	185,044,000	178,429,000
Incremental shares from assumed conversion of convertible notes	22,711,000	34,703,000	23,036,000	34,703,000
Convertible note hedge warrant shares	17,914,000	11,225,000	18,368,000	10,174,000
Restricted stock units	3,877,000	2,924,000	4,222,000	2,896,000
Stock options	469,000	2,571,000	508,000	2,635,000
Employee stock purchase rights	114,000	128,000	88,000	72,000
Dilutive potential common shares	45,085,000	51,551,000	46,222,000	50,480,000
Weighted average common shares-diluted	230,452,000	231,541,000	231,266,000	228,909,000
Continuing operations	$ 0.48	$ 0.68	$ 0.85	$ 0.97
Discontinued operations			$ 0.14
Net income per common share-basic	$ 0.48	$ 0.68	$ 0.99	$ 0.97
Continuing operations	$ 0.39	$ 0.55	$ 0.68	$ 0.79
Discontinued operations			$ 0.12
Net income per common share-diluted, Total	$ 0.39	$ 0.55	$ 0.80	$ 0.79
Stock Options [Member]
Computation of diluted net income per common share excluding the effect of the potential exercise of stock options to purchase	500,000	4,500,000	1,000,000	6,000,000
Restricted Stock [Member]
Computation of diluted net income per common share excluding the effect of the potential exercise of stock options to purchase		100,000		400,000

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Financial Instruments And Derivatives (Schedule Of Fair Value Of Derivative Instruments) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Foreign exchange contracts derivatives not designated as hedging instruments at fair value, net, total	$ 135	$ 157
Other Accrued Liabilities [Member]
Foreign exchange contracts derivatives not designated as hedging instruments, liability at fair value		157
Prepayments And Other Current Assets [Member]
Foreign exchange contracts derivatives not designated as hedging instruments, assets at fair value	$ 135

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Financial Instruments And Derivatives (Schedule Of Effect Of Derivative Instruments On Statement Of Operation Recognized) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Foreign exchange contracts derivatives not designated as hedging instruments, Gains (Losses) Recognized in Statement of Operations	$ (166)	$ (574)	$ 660	$ (1,260)
Interest Expense And Other [Member]
Foreign exchange contracts derivatives not designated as hedging instruments, Gains (Losses) Recognized in Statement of Operations	$ (166)	$ (574)	$ 660	$ (1,260)

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Comprehensive Income (Comprehensive Income) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Comprehensive Income
Net income	$ 89,058	$ 122,149	$ 183,930	$ 172,249
Foreign currency translation adjustment		210	2,266	(363)
Unrealized gains (losses) on investments, net of tax of $0, $0, $0 and $0	1,298	(401)	1,313	296
Actuarial (losses) gains arising during period, net of tax of $10, $1,121, ($5) and $1,247	(4,150)	17,202	(4,201)	17,587
Actuarial losses, net of tax of $8, $44, $20 and $90	2,377	953	4,455	2,707
Prior service costs, net of tax of $0, $0, $0 and $0	6	122	12	246
Settlement loss net of tax of $38, $0, $73 and $0	217		277
Comprehensive income	88,806	140,235	188,052	192,722
Unrealized gains (losses) on investments, tax	0	0	0	0
Actuarial (losses) gains arising during period, tax	10	1,121	(5)	1,247
Actuarial losses, tax	8	44	20	90
Prior service costs, tax	0	0	0	0
Settlement loss, tax	$ 38	$ 0	$ 73	$ 0

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Discontinued Operations (Details) (USD $)	3 Months Ended			6 Months Ended
	Jul. 03, 2011	Mar. 21, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Discontinued Operations
Net revenues			$ 9,505,000	$ 9,086,000	$ 19,790,000
(Loss) Income from discontinued operations before income taxes			(381,000)	1,278,000	620,000
(Loss) Gain from disposal of discontinued operations before income taxes	(832,000)			28,949,000
Income tax provision				4,311,000
(Loss) Income from discontinued operations	(832,000)		(381,000)	25,916,000	620,000
Cash received from sale of business		$ 40,200,000