Teradyne (TER) 10-Q 10 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 02, 2016	Nov. 04, 2016
Document Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 2, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Trading Symbol	TER
Entity Registrant Name	TERADYNE, INC
Entity Central Index Key	97,210
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		201,222,112

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 02, 2016		Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 297,937		$ 264,705
Marketable securities	598,501		477,696
Accounts receivable, less allowance for doubtful accounts of $2,372 and $2,407 at October 2, 2016 and December 31, 2015, respectively	163,213		211,293
Inventories, net:
Parts	59,498		73,117
Assemblies in process	22,517		32,825
Finished goods	33,051		47,646
Inventory, Net, Total	115,066		153,588
Deferred tax assets			54,973
Prepayments	104,078		91,519
Other current assets	6,393		6,194
Total current assets	1,285,188		1,259,968
Property, plant and equipment, net	261,821		273,414
Marketable securities	357,751		265,928
Deferred tax assets	90,546		7,404
Other assets	12,777		13,080
Retirement plans assets	4,869		636
Intangible assets, net	114,146		239,831
Goodwill	238,589		488,413
Total assets	2,365,687	[1]	2,548,674
Current liabilities:
Accounts payable	61,890		92,358
Accrued employees' compensation and withholdings	89,723		113,994
Deferred revenue and customer advances	138,916		85,527
Other accrued liabilities	56,580		43,727
Contingent consideration	1,050		15,500
Accrued income taxes	20,925		21,751
Total current liabilities	369,084		372,857
Long-term deferred revenue and customer advances	26,336		25,745
Retirement plans liabilities	108,095		103,531
Deferred tax liabilities	16,837		26,663
Long-term other accrued liabilities	31,354		32,156
Long-term contingent consideration	31,837		21,936
Total liabilities	583,543		582,888
Commitments and contingencies (See Note P)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 201,643 and 203,641 shares issued and outstanding at October 2, 2016 and December 31, 2015, respectively	25,205		25,455
Additional paid-in capital	1,517,957		1,480,647
Accumulated other comprehensive income (loss)	3,385		(8,144)
Retained earnings	235,597		467,828
Total shareholders' equity	1,782,144		1,965,786
Total liabilities and shareholders' equity	$ 2,365,687		$ 2,548,674
[1]	Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Accounts receivable, less allowance for doubtful accounts	$ 2,372	$ 2,407
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	201,643,000	203,641,000
Common stock, shares outstanding	201,643,000	203,641,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Revenues:
Products	$ 334,610	$ 386,488	$ 1,149,581	$ 1,096,056
Services	75,865	79,506	223,680	225,077
Total revenues	410,475	465,994	1,373,261	1,321,133
Cost of revenues:
Cost of products	148,266	170,963	531,616	471,450
Cost of services	34,850	36,405	101,084	100,067
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	183,116	207,368	632,700	571,517
Gross profit	227,359	258,626	740,561	749,616
Operating expenses:
Engineering and development	71,400	74,027	220,973	221,309
Selling and administrative	78,794	77,481	239,393	226,595
Acquired intangible assets amortization	8,487	20,053	44,725	49,119
Acquired intangible assets impairment			83,339
Goodwill impairment			254,946
Restructuring and other	12,177	261	16,372	(124)
Total operating expenses	170,858	171,822	859,748	496,899
Income (loss) from operations	56,501	86,804	(119,187)	252,717
Non-operating (income) expense:
Interest income	(2,892)	(1,708)	(6,201)	(5,198)
Interest expense	633	508	2,034	1,114
Other (income) expense, net	(921)	596	(1,075)	(5,180)
Income (loss) before income taxes	59,681	87,408	(113,945)	261,981
Income tax (benefit) provision	(4,113)	15,955	(4,178)	54,863
Net income (loss)	$ 63,794	$ 71,453	$ (109,767)	$ 207,118
Net income (loss) per common share:
Basic	$ 0.32	$ 0.34	$ (0.54)	$ 0.97
Diluted	$ 0.31	$ 0.34	$ (0.54)	$ 0.96
Weighted average common shares-basic	202,211	210,032	203,167	213,688
Weighted average common shares-diluted	203,929	211,736	203,167	215,348
Cash dividend declared per common share	$ 0.06	$ 0.06	$ 0.18	$ 0.18

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Net income (loss)	$ 63,794	$ 71,453	$ (109,767)	$ 207,118
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax of $0, $0, $0, $0	1,843	3,267	7,072	(3,000)
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $51, $48, $2,405, $(896), respectively	(336)	283	5,110	(593)
Less: Reclassification adjustment for gains included in net income, net of tax of $(150), $(126), $(152), $(335), respectively	(334)	(247)	(468)	(808)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(670)	36	4,642	(1,401)
Defined benefit pension and post-retirement plans:
Amortization of net prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax of $(46), $(42), $(139), $(127), respectively	(81)	(74)	(244)	(221)
Prior service income arising during period, net of tax of $0, $0, $34, $0, respectively			59
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(81)	(74)	(185)	(221)
Other comprehensive income (loss)	1,092	3,229	11,529	(4,622)
Comprehensive income (loss)	$ 64,886	$ 74,682	$ (98,238)	$ 202,496

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0	$ 0
Unrealized (losses) gains on marketable securities arising during period, tax	51	48	2,405	(896)
Reclassification adjustment for gains included in net income, tax	(150)	(126)	(152)	(335)
Amortization of net prior service (credit) cost included in net periodic pension and post-retirement expense/income, tax	(46)	(42)	(139)	(127)
Prior service credit, tax	$ 0	$ 0	$ 34	$ 0

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015
Cash flows from operating activities:
Net (loss) income	$ (109,767)	$ 207,118
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	48,437	52,531
Amortization	46,275	52,159
Stock-based compensation	23,012	23,080
Provision for excess and obsolete inventory	15,148	18,939
Goodwill impairment	254,946
Intangible assets impairment	83,339
Deferred taxes	(42,568)	(13,973)
Contingent consideration adjustment	10,451	(2,600)
Impairment of fixed assets	4,179
Property insurance recovery	(5,363)
Retirement plans actuarial gains	(1,200)
Gain from the sale of an equity investment		(5,406)
Non-cash charge for the sale of inventories revalued at date of acquisition		1,567
Tax benefit related to employee stock compensation awards	(3,399)	(3,213)
Other	151	2,523
Changes in operating assets and liabilities:
Accounts receivable	45,660	(91,117)
Inventories	48,601	33,376
Prepayments and other assets	(12,961)	15,529
Accounts payable and other accrued expenses	(47,941)	52,663
Deferred revenue and customer advances	53,380	6,751
Retirement plans contributions	(5,871)	(2,998)
Income taxes	4,227	25,677
Net cash provided by operating activities	408,736	372,606
Cash flows from investing activities:
Purchases of property, plant and equipment	(66,252)	(66,727)
Purchases of available-for-sale marketable securities	(875,837)	(957,606)
Proceeds from sales of available-for-sale marketable securities	466,744	843,734
Proceeds from maturities of available-for-sale marketable securities	202,162	330,363
Proceeds from property insurance	5,051
Acquisition of business, net of cash acquired		(282,741)
Proceeds from the sale of an equity investment		5,406
Proceeds from life insurance		1,098
Net cash used for investing activities	(268,132)	(126,473)
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	20,085	18,145
Repurchase of common stock	(85,092)	(226,843)
Dividend payments	(36,548)	(38,434)
Payments of contingent consideration	(11,697)
Tax benefit related to employee stock compensation awards	3,399	3,213
Payment of revolving credit facility costs		(2,253)
Net cash used for financing activities	(109,853)	(246,172)
Effects of exchange rate changes on cash and cash equivalents	2,481
Increase (decrease) in cash and cash equivalents	33,232	(39)
Cash and cash equivalents at beginning of period	264,705	294,256
Cash and cash equivalents at end of period	$ 297,937	$ 294,217

The Company

The Company	9 Months Ended
	Oct. 02, 2016
The Company	A. The Company Teradyne, Inc. (“Teradyne”) is a leading global supplier of automation equipment for test and industrial applications. Teradyne designs, develops, manufactures and sells automatic test systems used to test semiconductors, wireless products, data storage and complex electronics systems in the consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s industrial automation products include collaborative robots used by global manufacturing and light industrial customers to improve quality, increase manufacturing efficiency and decrease manufacturing costs. Teradyne’s automatic test equipment and industrial automation products and services include: • semiconductor test (“Semiconductor Test”) systems; • defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, storage test (“Storage Test”) systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”); • wireless test (“Wireless Test”) systems; and • industrial automation (“Industrial Automation”) products.

Accounting Policies

Accounting Policies	9 Months Ended
	Oct. 02, 2016
Accounting Policies	B. Accounting Policies Basis of Presentation The consolidated interim financial statements include the accounts of Teradyne and its wholly-owned 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 statement of such interim financial statements. Certain prior year amounts were reclassified to conform to the current year presentation. The December 31, 2015 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 U.S. Securities and Exchange Commission (“SEC”) on February 29, 2016, for the year ended December 31, 2015. Preparation of Financial Statements and Use of Estimates 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.

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	9 Months Ended
	Oct. 02, 2016
Recently Issued Accounting Pronouncements	C. Recently Issued Accounting Pronouncements On October 24, 2016, the Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-16, “Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory ” On March 31, 2016, the FASB issued ASU 2016-09, “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” “Leases.” In January 2016, the FASB issued ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ” In November 2015, the FASB issued ASU 2015-17, “Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes ” In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs,” “Interest—Imputation of Interest (Subtopic 835-30)” In August 2014, the FASB issued ASU 2014-15, “ Presentation of Financial Statements - Going Concern (Subtopic 205-40) . In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),”

Acquisitions

Acquisitions	9 Months Ended
	Oct. 02, 2016
Acquisitions	D. Acquisitions Universal Robots On June 11, 2015, Teradyne acquired all of the outstanding equity of Universal Robots located in Odense, Denmark. Universal Robots is the leading supplier of collaborative robots, which are low-cost, easy-to-deploy and simple-to-program robots that work side by side with production workers to improve quality, increase manufacturing efficiency and decrease manufacturing costs. Universal Robots is a separate operating and reportable segment, Industrial Automation. The total purchase price of $315.4 million consisted of $283.8 million of cash paid and $31.6 million of contingent consideration, measured at fair value. The contingent consideration was valued using a Monte Carlo simulation based on the following key inputs: (1) forecasted revenue; (2) forecast for earnings before income taxes, depreciation and amortization (“EBITDA”); (3) revenue volatility; (4) EBITDA volatility; and (5) discount rate. The contingent consideration is payable upon the achievement of certain thresholds and targets for EBITDA for calendar year 2015, revenue for the period from July 1, 2015 to December 31, 2017 and revenue for the period from July 1, 2015 to December 31, 2018. The maximum amount of contingent consideration that could be paid is $65 million. Based on Universal Robots’ calendar year 2015 EBITDA results, in the first quarter of 2016, Teradyne paid $15 million or 100% of the eligible EBITDA contingent consideration amount. In the fourth quarter of 2015, Teradyne finalized the valuation and purchase price allocation for the acquisition, which resulted in a $5.4 million decrease in goodwill as a result of a $2.2 million decrease in the fair value of contingent consideration, a $1.6 million increase in intangible assets and a $1.6 million decrease in acquired liabilities. The Universal Robots acquisition was accounted for as a business combination and, accordingly, the results have been included in Teradyne’s consolidated results of operations from the date of acquisition. The allocation of the total purchase price to Universal Robots’ net tangible liabilities and identifiable intangible assets was based on their estimated fair values as of the acquisition date. The excess of the purchase price over the identifiable intangible assets and net tangible liabilities in the amount of $221.1 million was allocated to goodwill, which is not deductible for tax purposes. The following table represents the final allocation of the purchase price: Purchase Price Allocation (in thousands) Goodwill $ 221,128 Intangible assets 121,590 Tangible assets acquired and liabilities assumed: Current assets 10,853 Non-current assets 3,415 Accounts payable and current liabilities (11,976 ) Long-term deferred tax liabilities (26,653 ) Long-term other liabilities (2,920 ) Total purchase price $ 315,437 Teradyne estimated the fair value of intangible assets using the income and cost approaches. Acquired intangible assets are amortized on a straight-line basis over their estimated useful lives. Components of these intangible assets and their estimated useful lives at the acquisition date are as follows: Fair Value Estimated Useful Life (in thousands) (in years) Developed technology $ 89,240 4.9 Trademarks and tradenames 22,920 10.0 Customer relationships 9,430 2.0 Total intangible assets $ 121,590 5.6 For the period from June 12, 2015 to October 4, 2015, Universal Robots contributed $19.8 million of revenues and had a $(6.5) million loss from operations before income taxes. The following unaudited pro forma information gives effect to the acquisition of Universal Robots as if the acquisition occurred on January 1, 2014. The unaudited pro forma results are not necessarily indicative of what actually would have occurred had the acquisition been in effect for the periods presented: For the Nine Months October 4, 2015 Revenue $ 1,339,181 Net income 197,745 Net income per common share: Basic $ 0.93 Diluted $ 0.92 Pro forma results for the nine months ended October 4, 2015 were adjusted to exclude $1.6 million of non-recurring expense related to the fair value adjustment to acquisition-date inventory and $1.0 million of acquisition related costs incurred in 2015.

Financial Instruments and Deriv

Financial Instruments and Derivatives	9 Months Ended
	Oct. 02, 2016
Financial Instruments and Derivatives	E. Financial Instruments and Derivatives Cash Equivalents Teradyne considers all highly liquid investments with maturities of three months or less at the date of acquisition to be cash equivalents. Marketable Securities Teradyne accounts for its investments in debt and equity securities in accordance with the provisions of ASC 320-10, “ Investments—Debt and Equity Securities. 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. Teradyne uses the market and income approach techniques to value its financial instruments and there were no changes in valuation techniques during the three and nine months ended October 2, 2016. As defined in ASC 820-10, “ Fair Value Measurements and Disclosures, 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, and is considered a Level 2 input; or 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. Teradyne’s available-for-sale debt and equity securities are classified as Level 1 and Level 2. Acquisition-related contingent consideration is classified as Level 3. Teradyne’s contingent consideration is valued using a Monte Carlo simulation model or a probability weighted discounted cash flow model. The majority of Level 2 securities are fixed income securities priced by third party pricing vendors. These pricing vendors utilize the most recent observable market information in pricing these securities or, if specific prices are not available, use other observable inputs like market transactions involving identical or comparable securities. Realized gains recorded in the three and nine months ended October 2, 2016 were $0.7 million and $1.2 million, respectively. Realized losses recorded in the three and nine months ended October 2, 2016 were $0.1 million and $0.4 million, respectively. Realized gains recorded in the three and nine months ended October 4, 2015 were $0.4 million and $1.4 million, respectively. Realized losses recorded in the nine months ended October 4, 2015 were $0.2 million. Realized gains are included in interest income and realized losses are included in interest expense. Unrealized gains and losses are included in accumulated other comprehensive income (loss). The cost of securities sold is based on the specific identification method. During the three and nine months ended October 2, 2016 and October 4, 2015, there were no transfers in or out of Level 1, Level 2 or Level 3 financial instruments. 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 October 2, 2016 and December 31, 2015. October 2, 2016 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 Cash $ 241,687 $ — $ — $ 241,687 Cash equivalents 55,576 674 — 56,250 Available-for-sale securities: U.S. Treasury securities — 676,310 — 676,310 Corporate debt securities — 117,260 — 117,260 Certificates of deposit and time deposits — 66,140 — 66,140 Commercial paper — 52,324 — 52,324 U.S. government agency securities — 25,802 — 25,802 Equity and debt mutual funds 17,666 — — 17,666 Non-U.S. government securities — 750 — 750 Total 314,929 939,260 — 1,254,189 Derivative assets — 1 — 1 Total $ 314,929 $ 939,261 $ — $ 1,254,190 Liabilities Contingent consideration $ — $ — $ 32,887 $ 32,887 Derivative liabilities — 361 — 361 Total $ — $ 361 $ 32,887 $ 33,248 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 297,263 $ 674 $ — $ 297,937 Marketable securities — 598,501 — 598,501 Long-term marketable securities 17,666 340,085 — 357,751 Prepayments — 1 — 1 $ 314,929 $ 939,261 $ — $ 1,254,190 Liabilities . Other current liabilities $ — $ 361 $ — $ 361 Contingent consideration — — 1,050 1,050 Long-term contingent consideration — — 31,837 31,837 $ — $ 361 $ 32,887 $ 33,248 December 31, 2015 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 Cash $ 213,336 $ — $ — $ 213,336 Cash equivalents 49,241 2,128 — 51,369 Available for sale securities: U.S. Treasury securities — 419,958 — 419,958 Corporate debt securities — 161,634 — 161,634 U.S. government agency securities — 83,952 — 83,952 Certificates of deposit and time deposits — 43,394 — 43,394 Commercial paper — 20,308 — 20,308 Equity and debt mutual funds 13,954 — — 13,954 Non-U.S. government securities — 424 — 424 Total $ 276,531 $ 731,798 $ — $ 1,008,329 Derivative assets — 109 — 109 Total $ 276,531 $ 731,907 $ — $ 1,008,438 Liabilities Contingent consideration $ — $ — $ 37,436 $ 37,436 Derivative liabilities — 146 — 146 Total $ — $ 146 $ 37,436 $ 37,582 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 262,577 $ 2,128 $ — $ 264,705 Marketable securities — 477,696 — 477,696 Long-term marketable securities 13,954 251,974 — 265,928 Prepayments — 109 — 109 $ 276,531 $ 731,907 $ — $ 1,008,438 Liabilities Other accrued liabilities $ — $ 146 $ — $ 146 Contingent consideration — — 15,500 15,500 Long-term contingent consideration — — 21,936 21,936 $ — $ 146 $ 37,436 $ 37,582 Changes in the fair value of Level 3 contingent consideration for the three and nine months ended October 2, 2016 and October 4, 2015 were as follows: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Balance at beginning of period $ 24,914 $ 35,595 $ 37,436 $ 3,350 Acquisition of Universal Robots — — — 33,845 Payments (a) — — (15,000 ) — Fair value adjustment (b)(c)(d)(e) 7,973 (1,000 ) 10,451 (2,600 ) Balance at end of period $ 32,887 $ 34,595 $ 32,887 $ 34,595 (a) In the nine months ended October 2, 2016, based on Universal Robots’ calendar year 2015 EBITDA results, Teradyne paid $15 million or 100% of the eligible EBITDA contingent consideration amount. (b) In the three and nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $8.0 million and $9.9 million, respectively, primarily due to an increase in forecasted revenue and a decrease in the discount rate. (c) In the nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Avionics Interface Technology, LLC (“AIT”) was increased by $0.6 million due to an increase in forecasted revenue. (d) In the three and nine months ended October 4, 2015, the fair value of contingent consideration for the earn-out in connection with the acquisition of AIT was reduced by $1.0 million due to a decrease in the revenue probabilities. (e) In the nine months ended October 4, 2015, the fair value measurement of the contingent consideration for the earn-out in connection with the acquisition of ZTEC Instruments, Inc. was reduced by $1.6 million, to $0, because Teradyne and the Securityholder Representative, on behalf of the ZTEC securityholders, agreed to terminate the earn-out prior to the end of the December 31, 2015 earn-out period, with no payout in connection with the resolution of indemnity claims asserted by both Teradyne and the Securityholder Representative. The following table provides quantitative information associated with the fair value measurement of Teradyne’s Level 3 financial instruments: Liability October 2, Valuation Technique Unobservable Inputs Weighted Average (in thousands) Contingent consideration (Universal Robots) $19,824 Monte Carlo Simulation Revenue volatility for the period July 1, 2015—December 31, 2017 10.7% Discount Rate 3.2% $12,013 Monte Carlo Simulation Revenue volatility for the period July 1, 2015—December 31, 2018 10.7% Discount Rate 3.2% Contingent consideration (AIT) $1,050 Income approach- discounted cash flow Revenue probability for calendar year 2016 Discount rate 100% As of October 2, 2016, the significant unobservable inputs used in the Monte Carlo simulation to fair value the Universal Robots contingent consideration include forecasted revenue, revenue volatility and discount rate. Increases or decreases in the inputs would result in a higher or lower fair value measurement. The maximum payment for each of the two Universal Robots revenue earn-outs is $25.0 million. The significant unobservable inputs used in the AIT fair value measurement of contingent consideration are the probabilities of successful achievement of the calendar year 2016 revenue threshold and target, and a discount rate. Increases or decreases in the revenue probabilities would result in a higher or lower fair value measurement. The maximum payment for the AIT earn-out is $1.05 million. The carrying amounts and fair values of Teradyne’s financial instruments at October 2, 2016 and December 31, 2015 were as follows: October 2, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 297,937 $ 297,937 $ 264,705 $ 264,705 Marketable securities 956,252 956,252 743,624 743,624 Derivative assets 1 1 109 109 Liabilities Contingent consideration 32,887 32,887 37,436 37,436 Derivative liabilities 361 361 146 146 The fair values of accounts receivable, net and accounts payable approximate the carrying value due to the short-term nature of these instruments. The following tables summarize the composition of available-for-sale marketable securities at October 2, 2016 and December 31, 2015: October 2, 2016 Available-for-Sale Fair Market Value of Investments with Unrealized Losses Cost Unrealized Gains Unrealized (Losses) Fair Value (in thousands) U.S. Treasury securities $ 675,745 $ 906 $ (341 ) $ 676,310 $ 371,188 Corporate debt securities 114,752 2,755 (247 ) 117,260 43,552 Certificates of deposit and time deposits 66,115 30 (5 ) 66,140 14,402 Commercial paper 52,323 15 (14 ) 52,324 25,317 U.S. government agency securities 25,738 64 — 25,802 3,830 Equity and debt mutual funds 15,801 1,870 (5 ) 17,666 348 Non-U.S. government securities 756 17 (23 ) 750 137 $ 951,230 $ 5,657 $ (635 ) $ 956,252 $ 458,774 Reported as follows: Cost Unrealized Gains Unrealized (Losses) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 598,416 $ 218 $ (133 ) $ 598,501 $ 273,604 Long-term marketable securities 352,814 5,439 (502 ) 357,751 185,170 $ 951,230 $ 5,657 $ (635 ) $ 956,252 $ 458,774 December 31, 2015 Available-for-Sale Fair Market Value of Investments with Unrealized Losses Cost Unrealized Gains Unrealized (Losses) Fair Value (in thousands) U.S. Treasury securities $ 421,060 $ 65 $ (1,167 ) $ 419,958 $ 379,434 Corporate debt securities 163,297 902 (2,565 ) 161,634 145,373 U.S. government agency securities 84,032 42 (122 ) 83,952 55,120 Certificates of deposit and time deposits 43,391 6 (3 ) 43,394 10,527 Commercial paper 20,298 11 (1 ) 20,308 8,646 Equity and debt mutual funds 12,996 1,119 (161 ) 13,954 2,560 Non-U.S. government securities 424 — — 424 — $ 745,498 $ 2,145 $ (4,019 ) $ 743,624 $ 601,660 Reported as follows: Cost Unrealized Gains Unrealized (Losses) Fair Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 478,306 $ 38 $ (648 ) $ 477,696 $ 374,785 Long-term marketable securities 267,192 2,107 (3,371 ) 265,928 226,875 $ 745,498 $ 2,145 $ (4,019 ) $ 743,624 $ 601,660 As of October 2, 2016, the fair market value of investments with unrealized losses totaled $458.8 million. Of this value, $3.1 million had unrealized losses of $0.2 million for greater than one year and $455.7 million had unrealized losses of $0.4 million for less than one year. As of December 31, 2015, the fair market value of investments with unrealized losses totaled $601.7 million. Of this value, $0.9 million had unrealized losses of $0.5 million for greater than one year and $600.8 million had unrealized losses of $3.6 million for less than one year. Teradyne reviews its investments to identify and evaluate investments that have an indication of possible impairment. Based on this review, Teradyne determined that the unrealized losses related to these investments at October 2, 2016 and December 31, 2015, were temporary. The contractual maturities of investments held at October 2, 2016 were as follows: October 2, 2016 Cost Fair Market Value (in thousands) Due within one year $ 598,416 $ 598,501 Due after 1 year through 5 years 288,344 288,370 Due after 5 years through 10 years 12,787 13,026 Due after 10 years 35,882 38,689 Total $ 935,429 $ 938,586 Contractual maturities of investments held at October 2, 2016 exclude equity and debt mutual funds as they do not have contractual maturity dates. 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 currency denominated monetary assets and liabilities. 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 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 value of monetary assets and liabilities denominated in foreign currencies. The notional amount of foreign currency forward contracts at October 2, 2016 and December 31, 2015 was $76.5 million and $114.1 million, respectively. The fair value of the outstanding contracts was a loss of $0.4 million and $0.0 million at October 2, 2016 and December 31, 2015, respectively. For the three and nine months ended October 2, 2016, Teradyne recorded net realized losses of $0.7 million and $10.8 million, respectively, related to foreign currency forward contracts hedging net monetary positions. For the three and nine months ended October 4, 2015, Teradyne recorded net realized losses of $0.8 million and $2.7 million, respectively, related to foreign currency forward contracts hedging net monetary positions. The following table summarizes the fair value of derivative instruments at October 2, 2016 and December 31, 2015: Balance Sheet Location October 2, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts assets Prepayments $ 1 $ 109 Foreign exchange contracts liabilities Other current liabilities (361 ) (146 ) Total derivatives $ (360 ) $ (37 ) Teradyne’s foreign exchange contracts are subject to master netting agreements. The following table summarizes the effect of derivative instruments recognized in the statement of operations during the three and nine months ended October 2, 2016 and October 4, 2015. Location of (Gains) Losses Recognized in Statement of Operations For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ 941 $ 677 $ 11,140 $ 2,555 Total Derivatives $ 941 $ 677 $ 11,140 $ 2,555 The table above does not reflect the corresponding gains and losses from the remeasurement of monetary assets and liabilities denominated in foreign currencies recorded in other (income) expense, net. For the three and nine months ended October 2, 2016, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $1.9 million and $12.2 million, respectively. For the three and nine months ended October 4, 2015, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $0.1 million and $2.3 million, respectively.

Debt

Debt	9 Months Ended
	Oct. 02, 2016
Debt	F. Debt Revolving Credit Facility On April 27, 2015, Teradyne entered into a Credit Agreement (the “Credit Agreement”) with Barclays Bank PLC, as administrative agent and collateral agent, and the lenders party thereto. The Credit Agreement provides for a five-year, senior secured revolving credit facility of up to $350 million (the “Credit Facility”). The Credit Agreement further provides that, subject to customary conditions, Teradyne may seek to obtain from existing or new lenders incremental commitments under the Credit Facility in an aggregate principal amount not to exceed $150 million. Proceeds from the Credit Facility may be used for general corporate purposes and working capital. Teradyne incurred $2.3 million in costs related to the revolving credit facility. These costs are being amortized over the five-year term of the revolving credit facility and are included in interest expense in the statement of operations. As of November 10, 2016, Teradyne has not borrowed any funds under the Credit Facility. The interest rates applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 1.00% per annum or LIBOR plus a margin ranging from 1.00% to 2.00% per annum, based on the Consolidated Leverage Ratio of Teradyne and its Restricted Subsidiaries. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.125% to 0.350% per annum, based on the then applicable Consolidated Leverage Ratio. Teradyne is not required to repay any loans under the Credit Facility prior to maturity, subject to certain customary exceptions. Teradyne is permitted to prepay all or any portion of the loans under the Credit Facility prior to maturity without premium or penalty, other than customary LIBOR breakage costs. The Credit Agreement contains customary events of default, representations, warranties and affirmative and negative covenants that, among other things, limit Teradyne’s and its Restricted Subsidiaries’ ability to sell assets, grant liens on assets, incur other secured indebtedness and make certain investments and restricted payments, all subject to exceptions set forth in the Credit Agreement. The Credit Agreement also requires Teradyne to satisfy two financial ratios measured as of the end of each fiscal quarter: a consolidated leverage ratio and an interest coverage ratio. As of November 10, 2016, Teradyne was in compliance with all covenants. The Credit Facility is guaranteed by certain of Teradyne’s domestic subsidiaries and collateralized by assets of Teradyne and such subsidiaries, including a pledge of 65% of the capital stock of certain foreign subsidiaries.

Prepayments

Prepayments	9 Months Ended
	Oct. 02, 2016
Prepayments	G. Prepayments Prepayments consist of the following and are included in prepayments on the balance sheet: October 2, December 31, (in thousands) Contract manufacturer prepayments $ 76,601 $ 66,283 Prepaid maintenance and other services 7,034 8,481 Prepaid taxes 4,665 3,781 Other prepayments 15,778 12,974 Total prepayments $ 104,078 $ 91,519

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances	9 Months Ended
	Oct. 02, 2016
Deferred Revenue and Customer Advances	H. 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 on the balance sheet: October 2, December 31, (in thousands) Extended warranty $ 48,351 $ 46,499 Product maintenance and training 38,109 30,616 Customer advances 4,865 17,456 Undelivered elements and other 73,927 16,701 Total deferred revenue and customer advances $ 165,252 $ 111,272

Product Warranty

Product Warranty	9 Months Ended
	Oct. 02, 2016
Product Warranty	I. Product Warranty Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance, delivery 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 warranty balance below is included in other accrued liabilities on the balance sheet. For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Balance at beginning of period $ 8,784 $ 8,228 $ 6,925 $ 8,942 Acquisition — — — 372 Accruals for warranties issued during the period 3,248 3,261 11,626 9,548 Adjustments related to pre-existing warranties (460 ) (1,211 ) (637 ) (3,039 ) Settlements made during the period (3,249 ) (2,370 ) (9,591 ) (7,915 ) Balance at end of period $ 8,323 $ 7,908 $ 8,323 $ 7,908 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 extended warranty balance below is included in short and long-term deferred revenue and customer advances on the balance sheet. For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, Balance at beginning of period $ 47,723 $ 43,299 $ 46,499 $ 43,300 Acquisition — — — 699 Deferral of new extended warranty revenue 7,048 10,442 22,773 22,818 Recognition of extended warranty deferred revenue (6,420 ) (6,252 ) (20,921 ) (19,328 ) Balance at end of period $ 48,351 $ 47,489 $ 48,351 $ 47,489

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Oct. 02, 2016
Stock-Based Compensation	J. Stock-Based Compensation Under Teradyne’s stock compensation plans, Teradyne grants stock options, restricted stock units and performance-based restricted stock units, and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”). Teradyne grants performance-based restricted stock units (“PRSUs”) to its executive officers with a performance metric based on relative total shareholder return (“TSR”). For TSR grants issued in 2014 and 2015, Teradyne’s three-year TSR performance is measured against the Philadelphia Semiconductor Index. For TSR grants issued in January 2016, Teradyne’s three-year TSR performance will be measured against the New York Stock Exchange (“NYSE”) Composite Index. The final number of TSR PRSUs that vest will vary based upon the level of performance achieved from 200% to 0% of the target shares. The TSR PRSUs will vest upon the three-year anniversary of the grant date. The TSR PRSUs are valued using a Monte Carlo simulation model. The number of units expected to be earned, based upon the achievement of the TSR market condition, is factored into the grant date Monte Carlo valuation. Compensation expense is recognized on a straight-line basis over the three-year service period. Compensation expense is recognized regardless of the eventual number of units that are earned based upon the market condition, provided the executive officer remains an employee at the end of the three-year period. Compensation expense is reversed if at any time during the three-year service period the executive officer is no longer an employee, subject to the retirement and termination eligibility provisions noted below. In January 2016, Teradyne granted PRSUs to its executive officers with a performance metric based on three-year cumulative non-GAAP profit before interest and tax (“PBIT”). Non-GAAP PBIT is a financial measure equal to GAAP income from operations less restructuring and other, net; amortization of acquired intangible assets; acquisition and divestiture related charges or credits; pension actuarial gains and losses; and other non-recurring gains and charges. The final number of PBIT PRSUs that vest will vary based upon the level of performance achieved from 200% to 0% of the target shares. The PBIT PRSUs will vest upon the three-year anniversary of the grant date. Compensation expense is recognized on a straight-line basis over the three-year service period. Compensation expense is recognized based on the number of units that are earned based upon the three-year Teradyne PBIT as a percent of Teradyne’s revenue, provided the executive officer remains an employee at the end of the three-year period subject to the retirement and termination eligibility provisions noted below. Beginning with PRSUs granted in January 2014, if the recipient’s employment ends prior to the determination of the performance percentage due to (1) permanent disability or death or (2) retirement or termination other than for cause, after attaining both at least age sixty and at least ten years of service, then all or a portion of the recipient’s PRSUs (based on the actual performance percentage achieved on the determination date) will vest on the date the performance percentage is determined. Except as set forth in the preceding sentence, no PRSUs will vest if the executive officer is no longer an employee at the end of the three-year period. During the nine months ended October 2, 2016 and October 4, 2015, Teradyne granted 0.1 million and 0.2 million TSR PRSUs, respectively, with a grant date fair value of $20.29 and $18.21, respectively. The fair value was estimated using the Monte Carlo simulation model with the following assumptions: For the Nine Months Ended October 2, October 4, Risk-free interest rate 0.97 % 0.77 % Teradyne volatility-historical 27.0 % 28.2 % NYSE Composite Index volatility-historical 13.1 % — Philadelphia Semiconductor Index volatility-historical — 19.7 % Dividend yield 1.24 % 1.33 % Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index for the 2016 grant and Philadelphia Semiconductor Index for the 2015 grant, over the most recent three year period. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Dividend yield was based upon an estimated annual dividend amount of $0.24 per share divided by Teradyne’s stock price on the grant date of $19.43 for the 2016 grant and $18.10 for the 2015 grant. During the nine months ended October 2, 2016, Teradyne granted 0.1 million PBIT PRSUs with a grant date fair value of $18.71. During the nine months ended October 2, 2016, Teradyne granted 1.2 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $18.49, 0.1 million of service-based restricted stock unit awards to non-employee directors at a weighted average grant date fair value of $18.71 and 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $5.30. During the nine months ended October 4, 2015, Teradyne granted 1.5 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $17.27, 0.1 million of service-based restricted stock unit awards to non-employee directors at a weighted average grant date fair value of $20.21 and 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $4.43 . Restricted stock unit awards granted to employees vest in equal annual installments over four years. Restricted stock unit awards granted to non-employee directors vest after a one year period, with 100% of the award vesting on the first anniversary of the grant date. Stock options vest in equal annual installments over four years and 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 Nine Months Ended October 2, October 4, Expected life (years) 5.0 4.0 Risk-free interest rate 1.4 % 1.1 % Volatility-historical 32.9 % 33.4 % Dividend yield 1.24 % 1.33 % 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 interest rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Dividend yield was based upon an estimated annual dividend amount of $0.24 per share divided by Teradyne’s stock price on the grant date, of $19.43 for the 2016 grant and $18.10 for the 2015 grant.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Oct. 02, 2016
Accumulated Other Comprehensive Income (Loss)	K. Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss), which is presented net of tax, consist of the following: For the Nine Months Ended October 2, 2016 Foreign Currency Translation Adjustment Unrealized Gains (Losses) on Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Balance at December 31, 2015, net of tax of $0, $(459), $(622) $ (8,759 ) $ (1,414 ) $ 2,029 $ (8,144 ) Other comprehensive income before reclassifications, net of tax of $0, $2,405, $0 7,072 5,110 — 12,182 Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(152), $(105) — (468 ) (185 ) (653 ) Net current period other comprehensive income (loss), net of tax of $0, $2,253, $(105) 7,072 4,642 (185 ) 11,529 Balance at October 2, 2016, net of tax of $0, $1,794, $(727) $ (1,687 ) $ 3,228 $ 1,844 $ 3,385 For the Nine months ended October 4, 2015 Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Balance at December 31, 2014, net of tax of $0, $1,598, $(453) $ — $ 2,365 $ 2,324 $ 4,689 Other comprehensive loss before reclassifications, net of tax of $0, $(896), $0 (3,000 ) (593 ) — (3,593 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(335), $(127) — (808 ) (221 ) (1,029 ) Net current period other comprehensive loss, net of tax of $0, $(1,231), $(127) (3,000 ) (1,401 ) (221 ) (4,622 ) Balance as October 4, 2015, net of tax of $0, $367, $(580) $ (3,000 ) $ 964 $ 2,103 $ 67 Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three and nine months ended October 2, 2016 and October 4, 2015 were as follows: Details about Accumulated Other Comprehensive Income Components For the Three Months Ended For the Nine Months Ended Affected Line Item of Operations October 2, October 4, October 2, October 4, (in thousands) Available-for-sale marketable securities: Unrealized gains, net of tax of $150, $126, $152, $335 $ 334 $ 247 $ 468 $ 808 Interest income Defined benefit pension and postretirement plans: Amortization of prior service credit, net of tax of $46, $42, $139, $127 81 74 244 221 (a) Prior service income arising during period, net of tax of $0, $0, $(34), $0 — — (59 ) — 81 74 185 221 Total reclassifications, net of tax of $196, $168, $257, $462 $ 415 $ 321 $ 653 $ 1,029 Net income (a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note O: “Retirement Plans.”

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Oct. 02, 2016
Goodwill and Intangible Assets	L. Goodwill and Intangible Assets Goodwill Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “Intangibles—Goodwill and Other” In the second quarter of 2016, the Wireless Test reporting unit (which is Teradyne’s Wireless Test operating and reportable segment) reduced headcount by 11% as a result of a sharp decline in projected demand attributable to an estimated smaller future wireless test market. The decrease in projected demand was due to lower forecasted buying from Teradyne’s largest Wireless Test segment customer (who has contributed between 51% and 73% of annual Wireless Test sales since the LitePoint acquisition in 2011) as a result of the customer’s numerous operational efficiencies; slower smartphone growth rates; and a slowdown of new wireless technology adoption. Teradyne considered the headcount reduction and sharp decline in projected demand to be a triggering event for an interim goodwill impairment test. Teradyne used the income and market approaches to determine the fair value of the Wireless Test reporting unit for step 1 of the goodwill impairment test. With respect to the income approach, Teradyne used the discounted cash flow method, which included seven year future cash flow projections and an estimated terminal value. The cash flow projections were prepared using Teradyne’s forecast, which was based upon underlying estimates of the total market size, and Teradyne’s market share in the wireless test market developed using Teradyne and independent third party data. The estimated terminal value was calculated using the Gordon Growth model. The market approach used a revenue multiple to develop an estimate of fair value. The revenue multiple was estimated using enterprise value as a ratio of next twelve months revenue for comparable companies. Teradyne equally weighted the income and market approaches to determine the fair value of the Wireless Test reporting unit. The carrying amount of the Wireless Test reporting unit exceeded its fair value; therefore, the second step of the goodwill impairment test was performed to calculate implied goodwill and to measure the amount of the impairment loss. Teradyne allocated the fair value of the Wireless Test reporting unit to all of its assets and liabilities (including unrecognized intangible assets). The net book value of raw materials inventory was estimated as an approximation of current replacement costs. The fair value of finished goods inventory was estimated at the present value of selling price less direct selling costs and profit on the selling effort. The selling price used in the inventory fair values was based upon the product gross margins included in Teradyne’s forecast. The fair value of the deferred revenue liability was estimated by assessing the costs required to service the obligation plus a reasonable profit margin. The fair value for personal property assets, which consisted of furniture and fixtures, machinery and equipment, computer equipment, software and leasehold improvements, was estimated using the replacement cost approach, which approximated carrying value. The fair value of intangible assets was estimated using the income approach and, in particular, developed technology and trademarks/trade names were valued using the relief-from-royalty method and customer relationships and customer backlog were valued using the discounted cash flow method. Royalty rates were estimated using rates applicable to wireless testing equipment and other similar technologies. Based upon this allocation, Teradyne determined that the Wireless Test reporting unit goodwill is valued at $8.0 million and recorded an impairment loss of $255 million in the second quarter of 2016. The changes in the carrying amount of goodwill by reportable segments for the nine months ended October 2, 2016, were as follows: Wireless Test Industrial Automation System Test Semiconductor Test Total (in thousands) Balance at December 31, 2015 Goodwill $ 361,819 $ 214,975 $ 158,699 $ 260,540 $ 996,033 Accumulated impairment losses (98,897 ) — (148,183 ) (260,540 ) (507,620 ) 262,922 214,975 10,516 — 488,413 Foreign currency translation adjustment — 5,122 — — 5,122 Goodwill impairment loss (254,946 ) — — — (254,946 ) Balance at October 2, 2016 Goodwill 361,819 220,097 158,699 260,540 1,001,155 Accumulated impairment losses (353,843 ) — (148,183 ) (260,540 ) (762,566 ) $ 7,976 $ 220,097 $ 10,516 $ — $ 238,589 Intangible Assets Teradyne reviews long-lived assets for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of these assets are no longer appropriate. As a result of the Wireless Test segment goodwill impairment review in the second quarter of 2016, Teradyne performed an impairment test of the Wireless Test segment’s intangible and long-lived assets. The impairment test is based on a comparison of the estimated undiscounted cash flows to the carrying value of the asset group. If undiscounted cash flows for the asset group are less than the carrying amount, the asset group is written down to its estimated fair value based on a discounted cash flow analysis. The cash flow estimates used to determine the impairment contain management’s best estimates using appropriate assumptions and projections at that time. The fair value of intangible assets was estimated using the income approach and, in particular, developed technology and trademarks/trade names were valued using the relief-from-royalty method and customer relationships were valued using the discounted cash flow method. Royalty rates were estimated using rates applicable to wireless testing equipment and other similar technologies. As a result of the analysis, Teradyne recorded an $83 million impairment charge in the second quarter of 2016 in acquired intangible assets impairment on the statement of operations, resulting in a remaining intangible assets balance of $5.8 million for the Wireless Test segment. Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: October 2, 2016 Gross Carrying Amount (1) Accumulated Amortization Foreign Net Carrying Amount Weighted Average Useful (in thousands) Developed technology $ 333,421 $ 264,248 $ (714 ) $ 68,459 6.0 years Customer relationships 110,602 92,139 (75 ) 18,388 7.9 years Tradenames and trademarks 53,034 25,711 (184 ) 27,139 9.5 years Non-compete agreement 320 160 — 160 4.0 years Customer backlog 170 170 — — 0.3 years Total intangible assets $ 497,547 $ 382,428 $ (973 ) $ 114,146 6.8 years (1) In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization. (2) Includes an $83 million impairment of Wireless Test amortizable intangible assets. December 31, 2015 Gross Carrying Amount (1) Accumulated Amortization Foreign Net Carrying Amount Weighted Average Useful Life (in thousands) Developed technology $ 382,262 $ 220,346 $ (2,444 ) $ 159,472 6.0 years Customer relationships 110,602 63,722 (258 ) 46,622 7.9 years Tradenames and trademarks 53,034 18,889 (628 ) 33,517 9.5 years Non-compete agreement 320 100 — 220 4.0 years Customer backlog 170 170 — — 0.3 years Total intangible assets $ 546,388 $ 303,227 $ (3,330 ) $ 239,831 6.7 years (1) In 2015, $98.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization. For the three and nine months ended October 2, 2016, aggregate intangible asset amortization expense was $8.5 million and $44.7 million, respectively. For the three and nine months ended October 4, 2015, aggregate intangible asset amortization expense was $20.1 million and $49.1 million, respectively. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2016 (remainder) $ 8,084 2017 30,552 2018 28,270 2019 24,364 2020 10,684 Thereafter 12,192

Net Income per Common Share

Net Income per Common Share	9 Months Ended
	Oct. 02, 2016
Net Income per Common Share	M. 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 Nine Months Ended October 2, October 4, October 2, October 4, (in thousands, except per share amounts) Net income (loss) for basic and diluted net income per share $ 63,794 $ 71,453 $ (109,767 ) $ 207,118 Weighted average common shares-basic 202,211 210,032 203,167 213,688 Effect of dilutive potential common shares: Restricted stock units 1,282 1,103 — 994 Stock options 421 578 — 626 Employee stock purchase plan 15 23 — 40 Dilutive potential common shares 1,718 1,704 — 1,660 Weighted average common shares-diluted 203,929 211,736 203,167 215,348 Net income (loss) per common share-basic $ 0.32 $ 0.34 $ (0.54 ) $ 0.97 Net income (loss) per common share-diluted $ 0.31 $ 0.34 $ (0.54 ) $ 0.96 The computation of diluted net income per common share for the three months ended October 2, 2016 excludes the effect of the potential exercise of stock options to purchase approximately 0.1 million shares because the effect would have been anti-dilutive. The computation of diluted net income per common share for the nine months ended October 2, 2016 excludes the effect of the potential exercise of all outstanding stock options and restricted stock units because Teradyne had a net loss and inclusion would be anti-dilutive. The computation of diluted net income per common share for the three and nine months ended October 4, 2015 excludes the effect of the potential exercise of stock options to purchase approximately 0.2 million shares because the effect would have been anti-dilutive.

Restructuring and Other

Restructuring and Other	9 Months Ended
	Oct. 02, 2016
Restructuring and Other	N. Restructuring and Other Other On April 16, 2016, an earthquake in Kumamoto, Japan damaged Teradyne’s main building at that location. The Teradyne owned building, which was used for engineering, production, and support operations, was damaged beyond repair and has no remaining utility to Teradyne. During the nine months ended October 2, 2016, Teradyne wrote off the building’s carrying value of $4.2 million. In the three and nine months ended October 2, 2016, Teradyne recorded $0.3 million and $1.2 million, respectively, of earthquake related expenses. Teradyne has $10 million of earthquake insurance with a deductible of approximately $2.5 million for the location. The $5.4 million of total charges were offset by $5.4 million of property insurance recovery. The charges and property insurance recovery were recognized in restructuring and other in the statement of operations. Teradyne has temporarily transferred some operations to other facilities in Japan and elsewhere while its Kumamoto operations are restored. During the three months ended October 2, 2016, Teradyne recorded an expense of $8.0 million for the increase in the fair value of contingent consideration liability related to Universal Robots. During the nine months ended October 2, 2016, Teradyne recorded an expense of $10.5 million for the increase in the fair value of contingent consideration liability, of which $9.9 million was related to Universal Robots and $0.6 million was related to AIT. During the three months ended October 4, 2015, Teradyne recorded a $1.0 million gain from the decrease in the fair value of the AIT contingent consideration liability, partially offset by $0.1 million of acquisition costs related to Universal Robots. During the nine months ended October 4, 2015, Teradyne recorded a $2.6 million gain from the decrease in the fair value of contingent consideration liability, of which $1.6 million was related to the ZTEC acquisition and $1.0 million was related to the AIT acquisition, partially offset by $1.1 million of acquisition costs related to Universal Robots. Restructuring During the three months ended October 2, 2016, Teradyne recorded $4.2 million of severance charges related to headcount reductions of 72 people, of which 55 people were in Wireless Test and 17 people were in Semiconductor Test. During the nine months ended October 2, 2016, Teradyne recorded $5.9 million of severance charges related to headcount reductions of 146 people, of which 102 people were in Wireless Test and 44 people were in Semiconductor Test. During the three and nine months ended October 4, 2015, Teradyne recorded $1.1 million and $1.4 million, respectively, of severance charges related to headcount reductions of 18 and 22 people, respectively, primarily in System Test.

Retirement Plans

Retirement Plans	9 Months Ended
	Oct. 02, 2016
Retirement Plans	O. Retirement Plans ASC 715, “Compensation—Retirement Benefits” 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 fixed income and equity securities. In addition, Teradyne has 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 (“ERISA”) and the Internal Revenue Code (“IRC”), as well as unfunded foreign plans. In the nine months ended October 2, 2016, Teradyne contributed $1.9 million to the U.S. Qualified Pension Plan, $1.9 million to the U.S. supplemental executive defined benefit pension plan and $1.5 million to certain qualified plans for non-U.S. subsidiaries. In the nine months ended October 4, 2015, Teradyne contributed $1.9 million to the U.S. supplemental executive defined benefit pension plan and $0.6 million to certain qualified plans for non-U.S. subsidiaries. For the three and nine months ended October 2, 2016 and October 4, 2015, Teradyne’s net periodic pension cost (income) was comprised of the following: For the Three Months Ended October 2, 2016 October 4, 2015 United States Foreign United States Foreign (in thousands) Service cost $ 575 $ 208 $ 616 $ 259 Interest cost 3,407 209 3,285 357 Expected return on plan assets (3,458 ) (6 ) (3,629 ) (185 ) Amortization of prior service cost 24 — 34 — Actuarial loss — 662 — — Total net periodic pension cost $ 548 $ 1,073 $ 306 $ 431 For the Nine Months Ended October 2, 2016 October 4, 2015 United States Foreign United States Foreign (in thousands) Service cost $ 1,726 $ 614 $ 1,847 $ 768 Interest cost 10,222 614 9,856 1,101 Expected return on plan assets (10,373 ) (17 ) (10,888 ) (595 ) Amortization of prior service cost 72 — 101 — Actuarial (gain) loss (1,848 ) 662 (3 ) — Settlement — (184 ) — — Total net periodic pension (income) cost $ (201 ) $ 1,689 $ 913 $ 1,274 Postretirement Benefit Plan 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 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. For the three months and nine months ended October 2, 2016 and October 4, 2015, Teradyne’s net periodic postretirement income was comprised of the following: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Service cost $ 9 $ 12 $ 28 $ 36 Interest cost 54 59 163 177 Amortization of prior service credit (151 ) (150 ) (455 ) (449 ) Actuarial gain — — (15 ) (19 ) Total net periodic post-retirement income $ (88 ) $ (79 ) $ (279 ) $ (255 )

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 02, 2016
Commitments and Contingencies	P. Commitments and Contingencies Purchase Commitments As of October 2, 2016, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $181.4 million, of which $179.0 million is for less than one year. 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.

Income Taxes

Income Taxes	9 Months Ended
	Oct. 02, 2016
Income Taxes	Q. Income Taxes The effective tax rate for the three months ended October 2, 2016 and October 4, 2015 was (6.9)% and 18.3%, respectively. The effective tax rate for the nine months ended October 2, 2016 and October 4, 2015 was 3.7% and 20.9%, respectively. The effective tax rates for the three and nine months ended October 2, 2016 differed from the expected federal statutory rate of 35% as a result of a non-deductible goodwill impairment charge, which reduced the benefit of the projected annual U.S. loss before income taxes, and increases in uncertain tax positions for transfer pricing, offset by the effect of lower statutory rates applicable to income earned outside the U.S., the benefit of U.S. research and development tax credits, and discrete tax benefits. Discrete tax benefits recorded in the three and nine months ended October 2, 2016 amounted to $6.4 million and $13.3 million respectively. The $6.4 million of discrete tax benefits recorded in the three months ended October 2, 2016 included $3.1 million from out-of-period adjustments, $1.6 million related to tax credit carryforwards, $0.7 million from non-taxable foreign exchange gains and $1.0 million of benefit from other discrete tax items. The $13.3 million of discrete tax benefits recorded in the nine months ended October 2, 2016 included $4.1 million from non-taxable foreign exchange gains, $3.1 million from out-of-period adjustments, $2.6 million of tax reserve releases resulting from the settlement of a U.S. tax audit, $1.6 million related to tax credit carryforwards, $0.9 million related to marketable securities and $1.0 million of benefit from other discrete tax items. During the three and nine months ended October 2, 2016, Teradyne recorded out-of-period adjustments of approximately $3.1 million to increase deferred tax assets and decrease income tax expense related to alternative minimum tax credits and capitalized inventory costs that should have been recognized previously. The out-of-period adjustments are not material to the current period or the relevant prior periods. The effective tax rate for the three months ended October 4, 2015 differed from the expected federal statutory rate of 35% as a result of additions to the uncertain tax positions for transfer pricing, partially offset by $3.3 million of discrete tax benefits composed of $1.8 million of benefit attributable to a United States Tax Court opinion regarding intercompany cost sharing arrangements, $0.6 million of reductions in uncertain tax positions resulting from the expiration of statutes and $0.9 million from other discrete tax benefits. The effective tax rate for the nine months ended October 4, 2015 differed from the expected federal statutory rate of 35% primarily because of the favorable effect of statutory rates applicable to income earned outside the United States. The effective tax rate for the nine months ended October 4, 2015 was increased by additions to the uncertain tax positions for transfer pricing, partially offset by $5.0 million of discrete tax benefits composed of $1.8 million of benefit attributable to a United States Tax Court opinion regarding intercompany cost sharing arrangements, $1.3 million of reductions in uncertain tax positions resulting from the expiration of statutes and the settlement of an audit, $0.9 million from disqualifying dispositions of incentive stock options and employee stock purchase plan shares and $1.0 million from other discrete tax benefits. On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of October 2, 2016, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not that the deferred tax assets would not be realized, the tax provision would increase in the period in which Teradyne determined that the realizability was not likely. Teradyne considers the probability of future taxable income and historical profitability, among other factors, in assessing the realizability of the deferred tax assets. As of October 2, 2016 and December 31, 2015, Teradyne had $34.7 million and $33.7 million, respectively, of reserves for uncertain tax positions. The $1.0 million net increase in reserves for uncertain tax positions is composed of additions related to transfer pricing exposures, partially offset by tax reserve releases resulting from the settlement of a U.S. tax audit. As of October 2, 2016, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $4.4 million in the next twelve months, as a result of a lapse of statutes of limitation. The estimated decrease is composed primarily of reserves relating to transfer pricing. Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of October 2, 2016 and December 31, 2015, $0.8 million and $0.5 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the nine months ended October 2, 2016, an expense of $0.3 million was recorded for interest and penalties related to income tax items. For the nine months ended October 4, 2015, a benefit of $0.3 million was recorded for interest and penalties related to income tax items. Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the nine months ended October 2, 2016 was $25.2 million, or $0.12 per diluted share. The tax savings due to the tax holiday for the nine months ended October 4, 2015 was $9.9 million, or $0.05 per diluted share. The tax holiday is scheduled to expire on December 31, 2020.

Segment Information

Segment Information	9 Months Ended
	Oct. 02, 2016
Segment Information	R. Segment Information Teradyne has four operating segments (Semiconductor Test, System Test, Wireless Test, and Industrial Automation), which are its reportable segments. The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The System Test segment includes operations related to the design, manufacturing and marketing of products and services for defense/aerospace instrumentation test, storage test and circuit-board test. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test products and services. The Industrial Automation segment includes operations related to the design, manufacturing and marketing of collaborative robots. Each operating segment has a segment manager who is directly accountable to and maintains regular contact with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts, and plans for the segment. 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 in effect are described in Note B: “Accounting Policies” in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2015. Segment information for the three months and nine months ended October 2, 2016 and October 4, 2015 is as follows: Semiconductor Test System Test Wireless Test Industrial Automation Corporate and Eliminations Consolidated (in thousands) Three Months Ended October 2, 2016 Revenues $ 322,021 $ 37,030 $ 27,919 $ 23,505 $ — $ 410,475 Income (loss) before income taxes (1)(2) 67,710 1,550 1,049 (4,695 ) (5,933 ) 59,681 Total assets (3) 522,529 90,713 65,953 340,030 1,346,462 2,365,687 Three Months Ended October 4, 2015 Revenues $ 325,516 $ 69,062 $ 55,359 $ 16,057 $ — $ 465,994 Income (loss) before income taxes (1)(2) 73,957 13,751 2,997 (4,847 ) 1,550 87,408 Total assets (3) 591,445 109,078 447,461 360,068 1,153,832 2,661,884 Nine Months Ended October 2, 2016 Revenues $ 1,097,608 $ 139,640 $ 70,660 $ 65,353 $ — $ 1,373,261 Income (loss) before income taxes (1)(2) 262,127 20,033 (375,596 ) (16,364 ) (4,145 ) (113,945 ) Total assets (3) 522,529 90,713 65,953 340,030 1,346,462 2,365,687 Nine Months Ended October 4, 2015 Revenues $ 996,748 $ 152,320 $ 152,285 $ 19,780 $ — $ 1,321,133 Income (loss) before income taxes (1)(2) 246,627 10,423 (603 ) (6,547 ) 12,081 261,981 Total assets (3) 591,445 109,078 447,461 360,068 1,153,832 2,661,884 (1) Interest income, interest expense, and other (income) expense, net are included in Corporate and Eliminations. (2) Included in the income (loss) before income taxes for each of the segments are charges related to inventory and other. (3) Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets. Included in the Semiconductor Test segment are charges in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Cost of revenues—inventory charge $ 2,351 $ 1,697 $ 8,270 $ 8,637 Restructuring and other 2,047 194 2,798 499 Total $ 4,398 $ 1,891 $ 11,068 $ 9,136 Included in the System Test segment are charges and credits in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Cost of revenues—inventory charge $ 121 $ 460 $ 441 $ 8,225 Restructuring and other (48 ) 923 (48 ) 923 Total $ 73 $ 1,383 $ 393 $ 9,148 Included in the Wireless Test segment are charges in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Goodwill impairment $ — $ — $ 254,946 $ — Intangible assets impairment — — 83,339 — Cost of revenues—inventory charge 561 901 6,437 2,077 Restructuring and other 1,672 — 2,639 — Total $ 2,233 $ 901 $ 347,361 $ 2,077 Included in the Industrial Automation segment are charges in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Cost of revenues—inventory step-up (1) $ — $ 972 $ — $ 1,567 Restructuring and other 532 — 532 — Total $ 532 $ 972 $ 532 $ 1,567 (1) Included in the cost of revenues for the three and nine months ended October 4, 2015 is the cost for purchase accounting inventory step-up. Included in Corporate and Eliminations are charges and credits in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Restructuring and other—Universal Robots contingent consideration adjustment $ 7,974 $ — $ 9,902 $ — Restructuring and other—Impairment of fixed assets and expenses related to Japan Earthquake 312 — 5,363 — Restructuring and other—Property insurance recovery (312 ) — (5,363 ) — Restructuring and other—AIT contingent consideration adjustment — (1,000 ) 550 (1,000 ) Restructuring and other—ZTEC contingent consideration adjustment — — — (1,600 ) Other (income) expense, net—Gain from the sale of an equity investment — — — (5,406 ) Restructuring and other—Universal Robots acquisition costs — 144 — 1,104 Total $ 7,974 $ (856 ) $ 10,452 $ (6,902 )

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Oct. 02, 2016
Shareholders' Equity	S. Shareholders’ Equity Stock Repurchase Program In January 2015, the Board of Directors authorized Teradyne to repurchase up to $500 million of common stock, of which $300 million was repurchased in 2015. In 2016, Teradyne intends to repurchase between $100 million and $200 million of common stock. During the nine months ended October 2, 2016, Teradyne repurchased 4.3 million shares of common stock at an average price per share of $19.69, for a total cost of $85.1 million. Cumulative repurchases as of October 2, 2016 totaled 19.9 million shares of common stock for a total purchase price of $385 million at an average price per share of $19.31. The total price includes commissions and is recorded as a reduction to retained earnings. Dividend Holders of Teradyne’s common stock are entitled to receive dividends when they are declared by Teradyne’s Board of Directors. In January 2016, May 2016, and August 2016, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.06 per share. Dividend payments for the three and nine months ended October 2, 2016 were $12.1 million and $36.5 million, respectively. In January 2015, May 2015, and August 2015, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.06 per share. Dividend payments for the three and nine months ended October 4, 2015 were $12.6 million and $38.4 million, respectively. While Teradyne declared a quarterly cash dividend and authorized a share repurchase program, it may reduce or eliminate the cash dividend or share repurchase program in the future. Future cash dividends and stock repurchases are subject to the discretion of Teradyne’s Board of Directors which will consider, among other things, Teradyne’s earnings, capital requirements and financial condition.

Accounting Policies (Policies)

Accounting Policies (Policies)	9 Months Ended
	Oct. 02, 2016
Basis of Presentation	Basis of Presentation The consolidated interim financial statements include the accounts of Teradyne and its wholly-owned 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 statement of such interim financial statements. Certain prior year amounts were reclassified to conform to the current year presentation. The December 31, 2015 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 U.S. Securities and Exchange Commission (“SEC”) on February 29, 2016, for the year ended December 31, 2015.
Preparation of Financial Statements and Use of Estimates	Preparation of Financial Statements and Use of Estimates 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.

Acquisitions (Tables)

Acquisitions (Tables) - Universal Robots	9 Months Ended
	Oct. 02, 2016
Final Allocation of the Purchase Price	The following table represents the final allocation of the purchase price: Purchase Price Allocation (in thousands) Goodwill $ 221,128 Intangible assets 121,590 Tangible assets acquired and liabilities assumed: Current assets 10,853 Non-current assets 3,415 Accounts payable and current liabilities (11,976 ) Long-term deferred tax liabilities (26,653 ) Long-term other liabilities (2,920 ) Total purchase price $ 315,437
Components of Intangible Assets and Their Estimated Useful Lives at Acquisition Date	Components of these intangible assets and their estimated useful lives at the acquisition date are as follows: Fair Value Estimated Useful Life (in thousands) (in years) Developed technology $ 89,240 4.9 Trademarks and tradenames 22,920 10.0 Customer relationships 9,430 2.0 Total intangible assets $ 121,590 5.6
Pro Forma Results Under Acquisitions	The unaudited pro forma results are not necessarily indicative of what actually would have occurred had the acquisition been in effect for the periods presented: For the Nine Months October 4, 2015 Revenue $ 1,339,181 Net income 197,745 Net income per common share: Basic $ 0.93 Diluted $ 0.92

Financial Instruments and Der29

Financial Instruments and Derivatives (Tables)	9 Months Ended
	Oct. 02, 2016
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	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 October 2, 2016 and December 31, 2015. October 2, 2016 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 Cash $ 241,687 $ — $ — $ 241,687 Cash equivalents 55,576 674 — 56,250 Available-for-sale securities: U.S. Treasury securities — 676,310 — 676,310 Corporate debt securities — 117,260 — 117,260 Certificates of deposit and time deposits — 66,140 — 66,140 Commercial paper — 52,324 — 52,324 U.S. government agency securities — 25,802 — 25,802 Equity and debt mutual funds 17,666 — — 17,666 Non-U.S. government securities — 750 — 750 Total 314,929 939,260 — 1,254,189 Derivative assets — 1 — 1 Total $ 314,929 $ 939,261 $ — $ 1,254,190 Liabilities Contingent consideration $ — $ — $ 32,887 $ 32,887 Derivative liabilities — 361 — 361 Total $ — $ 361 $ 32,887 $ 33,248 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 297,263 $ 674 $ — $ 297,937 Marketable securities — 598,501 — 598,501 Long-term marketable securities 17,666 340,085 — 357,751 Prepayments — 1 — 1 $ 314,929 $ 939,261 $ — $ 1,254,190 Liabilities . Other current liabilities $ — $ 361 $ — $ 361 Contingent consideration — — 1,050 1,050 Long-term contingent consideration — — 31,837 31,837 $ — $ 361 $ 32,887 $ 33,248 December 31, 2015 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 Cash $ 213,336 $ — $ — $ 213,336 Cash equivalents 49,241 2,128 — 51,369 Available for sale securities: U.S. Treasury securities — 419,958 — 419,958 Corporate debt securities — 161,634 — 161,634 U.S. government agency securities — 83,952 — 83,952 Certificates of deposit and time deposits — 43,394 — 43,394 Commercial paper — 20,308 — 20,308 Equity and debt mutual funds 13,954 — — 13,954 Non-U.S. government securities — 424 — 424 Total $ 276,531 $ 731,798 $ — $ 1,008,329 Derivative assets — 109 — 109 Total $ 276,531 $ 731,907 $ — $ 1,008,438 Liabilities Contingent consideration $ — $ — $ 37,436 $ 37,436 Derivative liabilities — 146 — 146 Total $ — $ 146 $ 37,436 $ 37,582 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 262,577 $ 2,128 $ — $ 264,705 Marketable securities — 477,696 — 477,696 Long-term marketable securities 13,954 251,974 — 265,928 Prepayments — 109 — 109 $ 276,531 $ 731,907 $ — $ 1,008,438 Liabilities Other accrued liabilities $ — $ 146 $ — $ 146 Contingent consideration — — 15,500 15,500 Long-term contingent consideration — — 21,936 21,936 $ — $ 146 $ 37,436 $ 37,582
Schedule of Changes in Fair Value of Level 3 Contingent Consideration	Changes in the fair value of Level 3 contingent consideration for the three and nine months ended October 2, 2016 and October 4, 2015 were as follows: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Balance at beginning of period $ 24,914 $ 35,595 $ 37,436 $ 3,350 Acquisition of Universal Robots — — — 33,845 Payments (a) — — (15,000 ) — Fair value adjustment (b)(c)(d)(e) 7,973 (1,000 ) 10,451 (2,600 ) Balance at end of period $ 32,887 $ 34,595 $ 32,887 $ 34,595 (a) In the nine months ended October 2, 2016, based on Universal Robots’ calendar year 2015 EBITDA results, Teradyne paid $15 million or 100% of the eligible EBITDA contingent consideration amount. (b) In the three and nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $8.0 million and $9.9 million, respectively, primarily due to an increase in forecasted revenue and a decrease in the discount rate. (c) In the nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Avionics Interface Technology, LLC (“AIT”) was increased by $0.6 million due to an increase in forecasted revenue. (d) In the three and nine months ended October 4, 2015, the fair value of contingent consideration for the earn-out in connection with the acquisition of AIT was reduced by $1.0 million due to a decrease in the revenue probabilities. (e) In the nine months ended October 4, 2015, the fair value measurement of the contingent consideration for the earn-out in connection with the acquisition of ZTEC Instruments, Inc. was reduced by $1.6 million, to $0, because Teradyne and the Securityholder Representative, on behalf of the ZTEC securityholders, agreed to terminate the earn-out prior to the end of the December 31, 2015 earn-out period, with no payout in connection with the resolution of indemnity claims asserted by both Teradyne and the Securityholder Representative.
Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument	The following table provides quantitative information associated with the fair value measurement of Teradyne’s Level 3 financial instruments: Liability October 2, Valuation Technique Unobservable Inputs Weighted Average (in thousands) Contingent consideration (Universal Robots) $19,824 Monte Carlo Simulation Revenue volatility for the period July 1, 2015—December 31, 2017 10.7% Discount Rate 3.2% $12,013 Monte Carlo Simulation Revenue volatility for the period July 1, 2015—December 31, 2018 10.7% Discount Rate 3.2% Contingent consideration (AIT) $1,050 Income approach- discounted cash flow Revenue probability for calendar year 2016 Discount rate 100%
Schedule of Carrying Amounts and Fair Values of Financial Instruments	The carrying amounts and fair values of Teradyne’s financial instruments at October 2, 2016 and December 31, 2015 were as follows: October 2, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 297,937 $ 297,937 $ 264,705 $ 264,705 Marketable securities 956,252 956,252 743,624 743,624 Derivative assets 1 1 109 109 Liabilities Contingent consideration 32,887 32,887 37,436 37,436 Derivative liabilities 361 361 146 146
Schedule of Available-for-Sale Marketable Securities	The following tables summarize the composition of available-for-sale marketable securities at October 2, 2016 and December 31, 2015: October 2, 2016 Available-for-Sale Fair Market Value of Investments with Unrealized Losses Cost Unrealized Gains Unrealized (Losses) Fair Value (in thousands) U.S. Treasury securities $ 675,745 $ 906 $ (341 ) $ 676,310 $ 371,188 Corporate debt securities 114,752 2,755 (247 ) 117,260 43,552 Certificates of deposit and time deposits 66,115 30 (5 ) 66,140 14,402 Commercial paper 52,323 15 (14 ) 52,324 25,317 U.S. government agency securities 25,738 64 — 25,802 3,830 Equity and debt mutual funds 15,801 1,870 (5 ) 17,666 348 Non-U.S. government securities 756 17 (23 ) 750 137 $ 951,230 $ 5,657 $ (635 ) $ 956,252 $ 458,774 Reported as follows: Cost Unrealized Gains Unrealized (Losses) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 598,416 $ 218 $ (133 ) $ 598,501 $ 273,604 Long-term marketable securities 352,814 5,439 (502 ) 357,751 185,170 $ 951,230 $ 5,657 $ (635 ) $ 956,252 $ 458,774 December 31, 2015 Available-for-Sale Fair Market Value of Investments with Unrealized Losses Cost Unrealized Gains Unrealized (Losses) Fair Value (in thousands) U.S. Treasury securities $ 421,060 $ 65 $ (1,167 ) $ 419,958 $ 379,434 Corporate debt securities 163,297 902 (2,565 ) 161,634 145,373 U.S. government agency securities 84,032 42 (122 ) 83,952 55,120 Certificates of deposit and time deposits 43,391 6 (3 ) 43,394 10,527 Commercial paper 20,298 11 (1 ) 20,308 8,646 Equity and debt mutual funds 12,996 1,119 (161 ) 13,954 2,560 Non-U.S. government securities 424 — — 424 — $ 745,498 $ 2,145 $ (4,019 ) $ 743,624 $ 601,660 Reported as follows: Cost Unrealized Gains Unrealized (Losses) Fair Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 478,306 $ 38 $ (648 ) $ 477,696 $ 374,785 Long-term marketable securities 267,192 2,107 (3,371 ) 265,928 226,875 $ 745,498 $ 2,145 $ (4,019 ) $ 743,624 $ 601,660
Contractual Maturities of Investments Held	The contractual maturities of investments held at October 2, 2016 were as follows: October 2, 2016 Cost Fair Market Value (in thousands) Due within one year $ 598,416 $ 598,501 Due after 1 year through 5 years 288,344 288,370 Due after 5 years through 10 years 12,787 13,026 Due after 10 years 35,882 38,689 Total $ 935,429 $ 938,586
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value	The following table summarizes the fair value of derivative instruments at October 2, 2016 and December 31, 2015: Balance Sheet Location October 2, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts assets Prepayments $ 1 $ 109 Foreign exchange contracts liabilities Other current liabilities (361 ) (146 ) Total derivatives $ (360 ) $ (37 )
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized	The following table summarizes the effect of derivative instruments recognized in the statement of operations during the three and nine months ended October 2, 2016 and October 4, 2015. Location of (Gains) Losses Recognized in Statement of Operations For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ 941 $ 677 $ 11,140 $ 2,555 Total Derivatives $ 941 $ 677 $ 11,140 $ 2,555

Prepayments (Tables)

Prepayments (Tables)	9 Months Ended
	Oct. 02, 2016
Schedule of Prepayments	Prepayments consist of the following and are included in prepayments on the balance sheet: October 2, December 31, (in thousands) Contract manufacturer prepayments $ 76,601 $ 66,283 Prepaid maintenance and other services 7,034 8,481 Prepaid taxes 4,665 3,781 Other prepayments 15,778 12,974 Total prepayments $ 104,078 $ 91,519

Deferred Revenue and Customer31

Deferred Revenue and Customer Advances (Tables)	9 Months Ended
	Oct. 02, 2016
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 on the balance sheet: October 2, December 31, (in thousands) Extended warranty $ 48,351 $ 46,499 Product maintenance and training 38,109 30,616 Customer advances 4,865 17,456 Undelivered elements and other 73,927 16,701 Total deferred revenue and customer advances $ 165,252 $ 111,272

Product Warranty (Tables)

Product Warranty (Tables)	9 Months Ended
	Oct. 02, 2016
Other Accrued Liabilities	The warranty balance below is included in other accrued liabilities on the balance sheet. For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Balance at beginning of period $ 8,784 $ 8,228 $ 6,925 $ 8,942 Acquisition — — — 372 Accruals for warranties issued during the period 3,248 3,261 11,626 9,548 Adjustments related to pre-existing warranties (460 ) (1,211 ) (637 ) (3,039 ) Settlements made during the period (3,249 ) (2,370 ) (9,591 ) (7,915 ) Balance at end of period $ 8,323 $ 7,908 $ 8,323 $ 7,908
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances	The extended warranty balance below is included in short and long-term deferred revenue and customer advances on the balance sheet. For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, Balance at beginning of period $ 47,723 $ 43,299 $ 46,499 $ 43,300 Acquisition — — — 699 Deferral of new extended warranty revenue 7,048 10,442 22,773 22,818 Recognition of extended warranty deferred revenue (6,420 ) (6,252 ) (20,921 ) (19,328 ) Balance at end of period $ 48,351 $ 47,489 $ 48,351 $ 47,489

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Oct. 02, 2016
Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions	The fair value was estimated using the Monte Carlo simulation model with the following assumptions: For the Nine Months Ended October 2, October 4, Risk-free interest rate 0.97 % 0.77 % Teradyne volatility-historical 27.0 % 28.2 % NYSE Composite Index volatility-historical 13.1 % — Philadelphia Semiconductor Index volatility-historical — 19.7 % Dividend yield 1.24 % 1.33 %
Stock Options
Fair Value of Stock Options Using Assumptions	The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions: For the Nine Months Ended October 2, October 4, Expected life (years) 5.0 4.0 Risk-free interest rate 1.4 % 1.1 % Volatility-historical 32.9 % 33.4 % Dividend yield 1.24 % 1.33 %

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Oct. 02, 2016
Changes in accumulated other comprehensive income (loss)	Changes in accumulated other comprehensive income (loss), which is presented net of tax, consist of the following: For the Nine Months Ended October 2, 2016 Foreign Currency Translation Adjustment Unrealized Gains (Losses) on Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Balance at December 31, 2015, net of tax of $0, $(459), $(622) $ (8,759 ) $ (1,414 ) $ 2,029 $ (8,144 ) Other comprehensive income before reclassifications, net of tax of $0, $2,405, $0 7,072 5,110 — 12,182 Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(152), $(105) — (468 ) (185 ) (653 ) Net current period other comprehensive income (loss), net of tax of $0, $2,253, $(105) 7,072 4,642 (185 ) 11,529 Balance at October 2, 2016, net of tax of $0, $1,794, $(727) $ (1,687 ) $ 3,228 $ 1,844 $ 3,385 For the Nine months ended October 4, 2015 Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Balance at December 31, 2014, net of tax of $0, $1,598, $(453) $ — $ 2,365 $ 2,324 $ 4,689 Other comprehensive loss before reclassifications, net of tax of $0, $(896), $0 (3,000 ) (593 ) — (3,593 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(335), $(127) — (808 ) (221 ) (1,029 ) Net current period other comprehensive loss, net of tax of $0, $(1,231), $(127) (3,000 ) (1,401 ) (221 ) (4,622 ) Balance as October 4, 2015, net of tax of $0, $367, $(580) $ (3,000 ) $ 964 $ 2,103 $ 67
Reclassifications Out of Accumulated Other Comprehensive Income to Statement of Operations	Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three and nine months ended October 2, 2016 and October 4, 2015 were as follows: Details about Accumulated Other Comprehensive Income Components For the Three Months Ended For the Nine Months Ended Affected Line Item of Operations October 2, October 4, October 2, October 4, (in thousands) Available-for-sale marketable securities: Unrealized gains, net of tax of $150, $126, $152, $335 $ 334 $ 247 $ 468 $ 808 Interest income Defined benefit pension and postretirement plans: Amortization of prior service credit, net of tax of $46, $42, $139, $127 81 74 244 221 (a) Prior service income arising during period, net of tax of $0, $0, $(34), $0 — — (59 ) — 81 74 185 221 Total reclassifications, net of tax of $196, $168, $257, $462 $ 415 $ 321 $ 653 $ 1,029 Net income (a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note O: “Retirement Plans.”

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Oct. 02, 2016
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the nine months ended October 2, 2016, were as follows: Wireless Test Industrial Automation System Test Semiconductor Test Total (in thousands) Balance at December 31, 2015 Goodwill $ 361,819 $ 214,975 $ 158,699 $ 260,540 $ 996,033 Accumulated impairment losses (98,897 ) — (148,183 ) (260,540 ) (507,620 ) 262,922 214,975 10,516 — 488,413 Foreign currency translation adjustment — 5,122 — — 5,122 Goodwill impairment loss (254,946 ) — — — (254,946 ) Balance at October 2, 2016 Goodwill 361,819 220,097 158,699 260,540 1,001,155 Accumulated impairment losses (353,843 ) — (148,183 ) (260,540 ) (762,566 ) $ 7,976 $ 220,097 $ 10,516 $ — $ 238,589
Schedule of Amortizable Intangible Assets	Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: October 2, 2016 Gross Carrying Amount (1) Accumulated Amortization Foreign Net Carrying Amount Weighted Average Useful (in thousands) Developed technology $ 333,421 $ 264,248 $ (714 ) $ 68,459 6.0 years Customer relationships 110,602 92,139 (75 ) 18,388 7.9 years Tradenames and trademarks 53,034 25,711 (184 ) 27,139 9.5 years Non-compete agreement 320 160 — 160 4.0 years Customer backlog 170 170 — — 0.3 years Total intangible assets $ 497,547 $ 382,428 $ (973 ) $ 114,146 6.8 years (1) In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization. (2) Includes an $83 million impairment of Wireless Test amortizable intangible assets. December 31, 2015 Gross Carrying Amount (1) Accumulated Amortization Foreign Net Carrying Amount Weighted Average Useful Life (in thousands) Developed technology $ 382,262 $ 220,346 $ (2,444 ) $ 159,472 6.0 years Customer relationships 110,602 63,722 (258 ) 46,622 7.9 years Tradenames and trademarks 53,034 18,889 (628 ) 33,517 9.5 years Non-compete agreement 320 100 — 220 4.0 years Customer backlog 170 170 — — 0.3 years Total intangible assets $ 546,388 $ 303,227 $ (3,330 ) $ 239,831 6.7 years (1) In 2015, $98.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
Schedule of Estimated Intangible Asset Amortization Expense	Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2016 (remainder) $ 8,084 2017 30,552 2018 28,270 2019 24,364 2020 10,684 Thereafter 12,192

Net Income per Common Share (Ta

Net Income per Common Share (Tables)	9 Months Ended
	Oct. 02, 2016
Computation of Basic and Diluted 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 Nine Months Ended October 2, October 4, October 2, October 4, (in thousands, except per share amounts) Net income (loss) for basic and diluted net income per share $ 63,794 $ 71,453 $ (109,767 ) $ 207,118 Weighted average common shares-basic 202,211 210,032 203,167 213,688 Effect of dilutive potential common shares: Restricted stock units 1,282 1,103 — 994 Stock options 421 578 — 626 Employee stock purchase plan 15 23 — 40 Dilutive potential common shares 1,718 1,704 — 1,660 Weighted average common shares-diluted 203,929 211,736 203,167 215,348 Net income (loss) per common share-basic $ 0.32 $ 0.34 $ (0.54 ) $ 0.97 Net income (loss) per common share-diluted $ 0.31 $ 0.34 $ (0.54 ) $ 0.96

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Oct. 02, 2016
Defined Benefit Pension Plans
Net Periodic Pension and Postretirement Cost (Income)	For the three and nine months ended October 2, 2016 and October 4, 2015, Teradyne’s net periodic pension cost (income) was comprised of the following: For the Three Months Ended October 2, 2016 October 4, 2015 United States Foreign United States Foreign (in thousands) Service cost $ 575 $ 208 $ 616 $ 259 Interest cost 3,407 209 3,285 357 Expected return on plan assets (3,458 ) (6 ) (3,629 ) (185 ) Amortization of prior service cost 24 — 34 — Actuarial loss — 662 — — Total net periodic pension cost $ 548 $ 1,073 $ 306 $ 431 For the Nine Months Ended October 2, 2016 October 4, 2015 United States Foreign United States Foreign (in thousands) Service cost $ 1,726 $ 614 $ 1,847 $ 768 Interest cost 10,222 614 9,856 1,101 Expected return on plan assets (10,373 ) (17 ) (10,888 ) (595 ) Amortization of prior service cost 72 — 101 — Actuarial (gain) loss (1,848 ) 662 (3 ) — Settlement — (184 ) — — Total net periodic pension (income) cost $ (201 ) $ 1,689 $ 913 $ 1,274
Postretirement Benefit Plans
Net Periodic Pension and Postretirement Cost (Income)	For the three months and nine months ended October 2, 2016 and October 4, 2015, Teradyne’s net periodic postretirement income was comprised of the following: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Service cost $ 9 $ 12 $ 28 $ 36 Interest cost 54 59 163 177 Amortization of prior service credit (151 ) (150 ) (455 ) (449 ) Actuarial gain — — (15 ) (19 ) Total net periodic post-retirement income $ (88 ) $ (79 ) $ (279 ) $ (255 )

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Oct. 02, 2016
Segment Information	Segment information for the three months and nine months ended October 2, 2016 and October 4, 2015 is as follows: Semiconductor Test System Test Wireless Test Industrial Automation Corporate and Eliminations Consolidated (in thousands) Three Months Ended October 2, 2016 Revenues $ 322,021 $ 37,030 $ 27,919 $ 23,505 $ — $ 410,475 Income (loss) before income taxes (1)(2) 67,710 1,550 1,049 (4,695 ) (5,933 ) 59,681 Total assets (3) 522,529 90,713 65,953 340,030 1,346,462 2,365,687 Three Months Ended October 4, 2015 Revenues $ 325,516 $ 69,062 $ 55,359 $ 16,057 $ — $ 465,994 Income (loss) before income taxes (1)(2) 73,957 13,751 2,997 (4,847 ) 1,550 87,408 Total assets (3) 591,445 109,078 447,461 360,068 1,153,832 2,661,884 Nine Months Ended October 2, 2016 Revenues $ 1,097,608 $ 139,640 $ 70,660 $ 65,353 $ — $ 1,373,261 Income (loss) before income taxes (1)(2) 262,127 20,033 (375,596 ) (16,364 ) (4,145 ) (113,945 ) Total assets (3) 522,529 90,713 65,953 340,030 1,346,462 2,365,687 Nine Months Ended October 4, 2015 Revenues $ 996,748 $ 152,320 $ 152,285 $ 19,780 $ — $ 1,321,133 Income (loss) before income taxes (1)(2) 246,627 10,423 (603 ) (6,547 ) 12,081 261,981 Total assets (3) 591,445 109,078 447,461 360,068 1,153,832 2,661,884 (1) Interest income, interest expense, and other (income) expense, net are included in Corporate and Eliminations. (2) Included in the income (loss) before income taxes for each of the segments are charges related to inventory and other. (3) Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.
Semiconductor Test
Schedule of Segment Reporting Information by Segment Charges	Included in the Semiconductor Test segment are charges in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Cost of revenues—inventory charge $ 2,351 $ 1,697 $ 8,270 $ 8,637 Restructuring and other 2,047 194 2,798 499 Total $ 4,398 $ 1,891 $ 11,068 $ 9,136
System Test
Schedule of Segment Reporting Information by Segment Charges	Included in the System Test segment are charges and credits in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Cost of revenues—inventory charge $ 121 $ 460 $ 441 $ 8,225 Restructuring and other (48 ) 923 (48 ) 923 Total $ 73 $ 1,383 $ 393 $ 9,148
Corporate And Eliminations
Schedule of Segment Reporting Information by Segment Charges	Included in Corporate and Eliminations are charges and credits in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Restructuring and other—Universal Robots contingent consideration adjustment $ 7,974 $ — $ 9,902 $ — Restructuring and other—Impairment of fixed assets and expenses related to Japan Earthquake 312 — 5,363 — Restructuring and other—Property insurance recovery (312 ) — (5,363 ) — Restructuring and other—AIT contingent consideration adjustment — (1,000 ) 550 (1,000 ) Restructuring and other—ZTEC contingent consideration adjustment — — — (1,600 ) Other (income) expense, net—Gain from the sale of an equity investment — — — (5,406 ) Restructuring and other—Universal Robots acquisition costs — 144 — 1,104 Total $ 7,974 $ (856 ) $ 10,452 $ (6,902 )
Industrial Automation
Schedule of Segment Reporting Information by Segment Charges	Included in the Industrial Automation segment are charges in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Cost of revenues—inventory step-up (1) $ — $ 972 $ — $ 1,567 Restructuring and other 532 — 532 — Total $ 532 $ 972 $ 532 $ 1,567 (1) Included in the cost of revenues for the three and nine months ended October 4, 2015 is the cost for purchase accounting inventory step-up.
Wireless Test
Schedule of Segment Reporting Information by Segment Charges	Included in the Wireless Test segment are charges in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended October 2, October 4, October 2, October 4, (in thousands) Goodwill impairment $ — $ — $ 254,946 $ — Intangible assets impairment — — 83,339 — Cost of revenues—inventory charge 561 901 6,437 2,077 Restructuring and other 1,672 — 2,639 — Total $ 2,233 $ 901 $ 347,361 $ 2,077

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	Jun. 11, 2015	Dec. 31, 2015	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Business Acquisition [Line Items]
Payments of contingent consideration				$ 11,697,000
Universal Robots
Business Acquisition [Line Items]
Total purchase price	$ 315,437,000
Cash paid to acquire outstanding common and preferred stock	283,800,000
Contingent consideration	31,600,000
Arrangement range of outcomes value high	65,000,000
Payments of contingent consideration				$ 15,000,000
EBITDA contingent consideration amount, percentage				100.00%
Decrease in goodwill		$ (5,400,000)
Contingent consideration adjustment		(2,200,000)
Increase in intangible assets		1,600,000
Decrease in acquired liabilities		$ (1,600,000)
Goodwill, not deductible for tax purposes	$ 221,100,000
Revenues			$ 19,800,000
Income (loss) before income taxes			$ (6,500,000)
Net income					$ 197,745,000
Universal Robots | Fair Value Adjustment to Inventory
Business Acquisition [Line Items]
Net income					1,600,000
Universal Robots | Acquisition Related Costs
Business Acquisition [Line Items]
Net income					$ 1,000,000

Allocation of Final Purchase Pr

Allocation of Final Purchase Price (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015	Jun. 11, 2015
Business Acquisition [Line Items]
Goodwill	$ 238,589	$ 488,413
Universal Robots
Business Acquisition [Line Items]
Goodwill			$ 221,128
Intangible assets			121,590
Current assets			10,853
Non-current assets			3,415
Accounts payable and current liabilities			(11,976)
Long-term deferred tax liabilities			(26,653)
Long-term other liabilities			(2,920)
Total purchase price			$ 315,437

Components of Intangible Assets

Components of Intangible Assets and Their Estimated Useful Lives at Acquisition Date (Detail) - Universal Robots $ in Thousands	Jun. 11, 2015USD ($)
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 121,590
Total intangible assets, estimated useful life, years	5 years 7 months 6 days
Developed technology
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 89,240
Total intangible assets, estimated useful life, years	4 years 10 months 24 days
Customer Relationships
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 9,430
Total intangible assets, estimated useful life, years	2 years
Trademarks and tradenames
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 22,920
Total intangible assets, estimated useful life, years	10 years

Pro Forma Results Under Acquisi

Pro Forma Results Under Acquisition (Detail) - Universal Robots $ / shares in Units, $ in Thousands	9 Months Ended
	Oct. 04, 2015USD ($)$ / shares
Business Acquisition [Line Items]
Revenue | $	$ 1,339,181
Net income | $	$ 197,745
Net income per common share, basic | $ / shares	$ 0.93
Net income per common share, diluted | $ / shares	$ 0.92

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2015
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized loss	$ 100,000		$ 400,000	$ 200,000
Available-for-sale securities, realized gain	700,000	$ 400,000	1,200,000	1,400,000
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	458,774,000		458,774,000		$ 601,660,000
Fair market value of investments with unrealized losses greater than one year	3,100,000		3,100,000		900,000
Aggregate loss of investments with unrealized losses greater than one year			200,000		500,000
Fair market value of investments with unrealized losses less than one year	455,700,000		455,700,000		600,800,000
Aggregate loss of investments with unrealized losses less than one year			400,000		3,600,000
Gains (losses) on foreign currency transactions	1,900,000	100,000	12,200,000	2,300,000
Realized gain(loss) on foreign currency contracts	(700,000)	$ (800,000)	(10,800,000)	$ (2,700,000)
Universal Robots
Financial Instruments and Fair Value [Line Items]
Maximum payment per earn-out			25,000,000
Avionics Interface Technologies, LLC
Financial Instruments and Fair Value [Line Items]
Maximum payment per earn-out			1,050,000
Foreign Currency Forward Contracts
Financial Instruments and Fair Value [Line Items]
Notional amount of foreign currency forward contracts	$ 76,500,000		76,500,000		114,100,000
Gains (losses) on foreign currency transactions			$ 400,000		$ 0

Schedule of Fair Value of Finan

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 956,252	$ 743,624
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	676,310	419,958
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	117,260	161,634
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	25,802	83,952
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	66,140	43,394
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	52,324	20,308
Equity And Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	17,666	13,954
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	750	424
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	1,254,189	1,008,329
Derivative assets	1	109
Total	1,254,190	1,008,438
Contingent consideration	32,887	37,436
Derivative liabilities	361	146
Total	33,248	37,582
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	241,687	213,336
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	56,250	51,369
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	676,310	419,958
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	117,260	161,634
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	25,802	83,952
Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	66,140	43,394
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	52,324	20,308
Fair Value, Measurements, Recurring | Equity And Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	17,666	13,954
Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	750	424
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	314,929	276,531
Total	314,929	276,531
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	241,687	213,336
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	55,576	49,241
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Equity And Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	17,666	13,954
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	939,260	731,798
Derivative assets	1	109
Total	939,261	731,907
Derivative liabilities	361	146
Total	361	146
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	674	2,128
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	676,310	419,958
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	117,260	161,634
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	25,802	83,952
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	66,140	43,394
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	52,324	20,308
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	750	424
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	32,887	37,436
Total	$ 32,887	$ 37,436

Schedule of Reported Financial

Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 1,254,190	$ 1,008,438
Liabilities	33,248	37,582
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	361
Other Accrued Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities		146
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	297,937	264,705
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	598,501	477,696
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	357,751	265,928
Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	1	109
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,050	15,500
Long Term Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	31,837	21,936
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	314,929	276,531
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	297,263	262,577
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	17,666	13,954
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	939,261	731,907
Liabilities	361	146
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	361
Significant Other Observable Inputs (Level 2) | Other Accrued Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities		146
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	674	2,128
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	598,501	477,696
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	340,085	251,974
Significant Other Observable Inputs (Level 2) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	1	109
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	32,887	37,436
Significant Unobservable Inputs (Level 3) | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,050	15,500
Significant Unobservable Inputs (Level 3) | Long Term Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	$ 31,837	$ 21,936

Schedule of Changes in Fair Val

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		$ 24,914	$ 35,595	$ 37,436	$ 3,350
Payments	[1]			(15,000)
Fair value adjustment	[2],[3],[4],[5]	7,973	(1,000)	10,451	(2,600)
Ending Balance		$ 32,887	$ 34,595	$ 32,887	34,595
Universal Robots
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition					$ 33,845
[1]	In the nine months ended October 2, 2016, based on Universal Robots' calendar year 2015 EBITDA results, Teradyne paid $15 million or 100% of the eligible EBITDA contingent consideration amount.
[2]	In the nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Avionics Interface Technology, LLC ("AIT") was increased by $0.6 million due to an increase in forecasted revenue.
[3]	In the nine months ended October 4, 2015, the fair value measurement of the contingent consideration for the earn-out in connection with the acquisition of ZTEC Instruments, Inc. was reduced by $1.6 million, to $0, because Teradyne and the Securityholder Representative, on behalf of the ZTEC securityholders, agreed to terminate the earn-out prior to the end of the December 31, 2015 earn-out period, with no payout in connection with the resolution of indemnity claims asserted by both Teradyne and the Securityholder Representative.
[4]	In the three and nine months ended October 2, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $8.0 million and $9.9 million, respectively, primarily due to an increase in forecasted revenue and a decrease in the discount rate.
[5]	In the three and nine months ended October 4, 2015, the fair value of contingent consideration for the earn-out in connection with the acquisition of AIT was reduced by $1.0 million due to a decrease in the revenue probabilities.

Schedule of Changes in Fair V47

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Jun. 11, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration			$ 11,697
Increase(decrease)in contingent consideration	$ 8,000		10,451	$ (2,600)
Universal Robots
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration			$ 15,000
EBITDA contingent consideration amount, percentage	100.00%		100.00%
Increase(decrease)in contingent consideration	$ 8,000		$ 9,900
Contingent consideration					$ 31,600
Avionics Interface Technologies, LLC
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase(decrease)in contingent consideration		$ (1,000)	$ 600	(1,000)
ZTEC Instruments, Inc.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase(decrease)in contingent consideration				(1,600)
Contingent consideration		$ 0		$ 0

Quantitative Information Associ

Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2016	Jun. 11, 2015
Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration		$ 31,600
Monte Carlo simulation model | Revenue for the period July 1, 2015-December 31, 2017 | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Target achievement, volatility	10.70%
Discount Rate	3.20%
Monte Carlo simulation model | Revenue for the period July 1, 2015-December 31, 2018 | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Target achievement, volatility	10.70%
Discount Rate	3.20%
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	$ 12,013
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3) | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	$ 19,824
Income Approach Valuation Technique | Revenue for calendar year 2016 | Avionics Interface Technologies, LLC
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount Rate	4.00%
Target achievement, probability	100.00%
Income Approach Valuation Technique | Significant Unobservable Inputs (Level 3) | Avionics Interface Technologies, LLC
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	$ 1,050

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities	$ 956,252	$ 743,624
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	297,937	264,705
Marketable securities	956,252	743,624
Derivative assets	1	109
Contingent consideration	32,887	37,436
Derivative liabilities	361	146
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	297,937	264,705
Marketable securities	956,252	743,624
Derivative assets	1	109
Contingent consideration	32,887	37,436
Derivative liabilities	$ 361	$ 146

Schedule of Available for Sale

Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 951,230	$ 745,498
Available-for-sale marketable securities, Unrealized Gains	5,657	2,145
Available-for-sale marketable securities, Unrealized (Losses)	(635)	(4,019)
Available-for-sale marketable securities, Fair Market Value	956,252	743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	458,774	601,660
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	675,745	421,060
Available-for-sale marketable securities, Unrealized Gains	906	65
Available-for-sale marketable securities, Unrealized (Losses)	(341)	(1,167)
Available-for-sale marketable securities, Fair Market Value	676,310	419,958
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	371,188	379,434
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	114,752	163,297
Available-for-sale marketable securities, Unrealized Gains	2,755	902
Available-for-sale marketable securities, Unrealized (Losses)	(247)	(2,565)
Available-for-sale marketable securities, Fair Market Value	117,260	161,634
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	43,552	145,373
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	25,738	84,032
Available-for-sale marketable securities, Unrealized Gains	64	42
Available-for-sale marketable securities, Unrealized (Losses)		(122)
Available-for-sale marketable securities, Fair Market Value	25,802	83,952
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,830	55,120
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	66,115	43,391
Available-for-sale marketable securities, Unrealized Gains	30	6
Available-for-sale marketable securities, Unrealized (Losses)	(5)	(3)
Available-for-sale marketable securities, Fair Market Value	66,140	43,394
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	14,402	10,527
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	52,323	20,298
Available-for-sale marketable securities, Unrealized Gains	15	11
Available-for-sale marketable securities, Unrealized (Losses)	(14)	(1)
Available-for-sale marketable securities, Fair Market Value	52,324	20,308
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	25,317	8,646
Equity And Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	15,801	12,996
Available-for-sale marketable securities, Unrealized Gains	1,870	1,119
Available-for-sale marketable securities, Unrealized (Losses)	(5)	(161)
Available-for-sale marketable securities, Fair Market Value	17,666	13,954
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	348	2,560
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	756	424
Available-for-sale marketable securities, Unrealized Gains	17
Available-for-sale marketable securities, Unrealized (Losses)	(23)
Available-for-sale marketable securities, Fair Market Value	750	$ 424
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 137

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 951,230	$ 745,498
Available-for-sale marketable securities, Unrealized Gains	5,657	2,145
Available-for-sale marketable securities, Unrealized (Losses)	(635)	(4,019)
Available-for-sale marketable securities, Fair Market Value	956,252	743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	458,774	601,660
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	598,416	478,306
Available-for-sale marketable securities, Unrealized Gains	218	38
Available-for-sale marketable securities, Unrealized (Losses)	(133)	(648)
Available-for-sale marketable securities, Fair Market Value	598,501	477,696
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	273,604	374,785
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	352,814	267,192
Available-for-sale marketable securities, Unrealized Gains	5,439	2,107
Available-for-sale marketable securities, Unrealized (Losses)	(502)	(3,371)
Available-for-sale marketable securities, Fair Market Value	357,751	265,928
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 185,170	$ 226,875

Contractual Maturities of Inves

Contractual Maturities of Investments Held (Detail) $ in Thousands	Oct. 02, 2016USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 598,416
Due after 1 year through 5 years, cost	288,344
Due after 5 years through 10 years, cost	12,787
Due after 10 years, cost	35,882
Total, cost	935,429
Due within one year, fair value	598,501
Due after 1 year through 5 years, fair value	288,370
Due after 5 years through 10 years, fair value	13,026
Due after 10 years, fair value	38,689
Total, fair value	$ 938,586

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ (360)	$ (37)
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Prepayments
Derivatives, Fair Value [Line Items]
Derivative assets	1	109
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (361)	$ (146)

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts derivatives not designated as hedging instruments, Gains (Losses) Recognized in Statement of Operations	$ 941	$ 677	$ 11,140	$ 2,555
Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts derivatives not designated as hedging instruments, Gains (Losses) Recognized in Statement of Operations	$ 941	$ 677	$ 11,140	$ 2,555

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Apr. 27, 2015	Oct. 02, 2016
Debt Instrument
Term of loan, years	5 years
Pledge percentage of capital stock	65.00%
Maximum
Debt Instrument
Aggregate principal amount	$ 150,000,000
Commitment fee percentage of unused portion of credit facility	0.35%
Minimum
Debt Instrument
Commitment fee percentage of unused portion of credit facility	0.125%
Base Rate | Maximum
Debt Instrument
Debt instrument, basis spread on variable rate	1.00%
Base Rate | Minimum
Debt Instrument
Debt instrument, basis spread on variable rate	0.00%
London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument
Debt instrument, basis spread on variable rate	2.00%
London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument
Debt instrument, basis spread on variable rate	1.00%
Revolving Credit Facility
Debt Instrument
Financing cost		$ 2,300,000
Financing cost, amortization term		5 years
Revolving Credit Facility | Maximum
Debt Instrument
Credit facility, borrowing capacity	$ 350,000,000

Schedule of Prepayments (Detail

Schedule of Prepayments (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Prepaid And Other Current Assets [Line Items]
Contract manufacturer prepayments	$ 76,601	$ 66,283
Prepaid maintenance and other services	7,034	8,481
Prepaid taxes	4,665	3,781
Other prepayments	15,778	12,974
Total prepayments	$ 104,078	$ 91,519

Deferred Revenue and Customer57

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Oct. 02, 2016	Jul. 03, 2016	Dec. 31, 2015	Oct. 04, 2015	Jul. 05, 2015	Dec. 31, 2014
Deferred Revenue Arrangement
Extended warranty	$ 48,351	$ 47,723	$ 46,499	$ 47,489	$ 43,299	$ 43,300
Product maintenance and training	38,109		30,616
Customer advances	4,865		17,456
Undelivered elements and other	73,927		16,701
Total deferred revenue and customer advances	$ 165,252		$ 111,272

Warranty Accrual Included in Ot

Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 8,784	$ 8,228	$ 6,925	$ 8,942
Acquisition				372
Accruals for warranties issued during the period	3,248	3,261	11,626	9,548
Adjustments related to pre-existing warranties	(460)	(1,211)	(637)	(3,039)
Settlements made during the period	(3,249)	(2,370)	(9,591)	(7,915)
Balance at end of period	$ 8,323	$ 7,908	$ 8,323	$ 7,908

Extended Product Warranty Inclu

Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 47,723	$ 43,299	$ 46,499	$ 43,300
Acquisition				699
Deferral of new extended warranty revenue	7,048	10,442	22,773	22,818
Recognition of extended warranty deferred revenue	(6,420)	(6,252)	(20,921)	(19,328)
Balance at end of period	$ 48,351	$ 47,489	$ 48,351	$ 47,489

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - $ / shares shares in Millions	1 Months Ended		9 Months Ended
	Jan. 31, 2016	Jan. 31, 2014	Oct. 02, 2016	Oct. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Stock options term			7 years
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted			1.2	1.5
Weighted average grant date fair value of restricted stock units granted			$ 18.49	$ 17.27
Service-Based Restricted Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted			0.1	0.1
Weighted average grant date fair value of restricted stock units granted			$ 18.71	$ 20.21
Service-Based Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Number of service-based stock options granted to executive officers			0.1	0.1
Weighted average grant date fair value of stock options granted to executive officers			$ 5.30	$ 4.43
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments			4 years
Restricted Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments			1 year
Percentage of awards vesting on the first anniversary of grant date			100.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments			4 years
TSR Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Minimum age of retirement to be eligible for PRSUs		60 years
Minimum years of service for retirement to be eligible for PRSUs		10 years
Restricted stock unit awards granted			0.1	0.2
Weighted average grant date fair value of restricted stock units granted			$ 20.29	$ 18.21
Estimated annual dividend amount per share			0.24
Stock price			$ 19.43	$ 18.10
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	200.00%
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	0.00%
PBIT PRSUs
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Restricted stock unit awards granted			0.1
Weighted average grant date fair value of restricted stock units granted			$ 18.71
PBIT PRSUs | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	200.00%
PBIT PRSUs | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	0.00%

Schedule of Estimated Fair Valu

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions (Detail) - TSR Performance-Based Restricted Stock Units	9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	0.97%	0.77%
Expected historical volatility	27.00%	28.20%
Dividend yield	1.24%	1.33%
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	13.10%
Philadelphia Semiconductor Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility		19.70%

Schedule of Estimated Fair Va62

Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Stock Options	9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	5 years	4 years
Risk-free interest rate	1.40%	1.10%
Volatility-historical	32.90%	33.40%
Dividend yield	1.24%	1.33%

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 1,965,786
Other comprehensive income (loss) before reclassifications, net of tax			12,182	$ (3,593)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax			(653)	(1,029)
Other comprehensive income (loss), net of tax	$ 1,092	$ 3,229	11,529	(4,622)
Ending balance	1,782,144		1,782,144
Foreign currency translation reclassification adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(8,759)
Other comprehensive income (loss) before reclassifications, net of tax			7,072	(3,000)
Other comprehensive income (loss), net of tax			7,072	(3,000)
Ending balance	(1,687)	(3,000)	(1,687)	(3,000)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(1,414)	2,365
Other comprehensive income (loss) before reclassifications, net of tax			5,110	(593)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax			468	808
Other comprehensive income (loss), net of tax			4,642	(1,401)
Ending balance	3,228	964	3,228	964
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			2,029	2,324
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	81	74	185	221
Other comprehensive income (loss), net of tax			(185)	(221)
Ending balance	1,844	2,103	1,844	2,103
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(8,144)	4,689
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	415	321	653	1,029
Ending balance	$ 3,385	$ 67	$ 3,385	$ 67

Changes in Accumulated Other 64

Changes in Accumulated Other Comprehensive Income (Loss) Balances (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (196)	$ (168)	$ (257)	$ (462)
Foreign currency translation adjustments, tax	0	0	0	0	$ 0	$ 0
Unrealized gains on marketable securities, tax	1,794	367	1,794	367	(459)	1,598
Retirement plans prior service benefit, tax	(727)	(580)	(727)	(580)	$ (622)	$ (453)
Foreign currency translation reclassification adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax			0	0
Other comprehensive income (loss), tax			0	0
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			2,405	(896)
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (150)	$ (126)	(152)	(335)
Other comprehensive income (loss), tax			2,253	(1,231)
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax			(105)	(127)
Other comprehensive income (loss), tax			$ (105)	$ (127)

Reclassification Out of Accumul

Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	$ (2,892)	$ (1,708)	$ (6,201)	$ (5,198)
Reclassifications, net of tax			(653)	(1,029)
Unrealized Gains (Losses) on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax			468	808
Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	81	74	244	221
Prior service cost arising during period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax			(59)
Retirement Plans Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	81	74	185	221
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	415	321	653	1,029
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	$ 334	$ 247	$ 468	$ 808

Reclassification Out of Accum66

Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 196	$ 168	$ 257	$ 462
Unrealized Gains (Losses) on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	150	126	152	335
Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	(46)	(42)	(139)	(127)
Prior service cost arising during period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 0	$ 0	$ (34)	$ 0

Goodwill and Intangible Asset67

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 02, 2016	Jul. 03, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment				$ 254,946
Goodwill	$ 238,589			238,589		$ 488,413
Intangible assets impairment				83,339
Intangible assets	114,146			114,146		239,831
Acquired intangible asset amortization	8,487		$ 20,053	44,725	$ 49,119
Wireless Test
Goodwill and Intangible Assets Disclosure [Line Items]
Employee reduction, percentage		11.00%
Goodwill impairment		$ 254,946		254,946
Goodwill	$ 7,976	7,976		7,976		$ 262,922
Intangible assets impairment		83,000		$ 83,339
Intangible assets		$ 5,800
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Concentration risk, percentage		51.00%
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Concentration risk, percentage		73.00%

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 03, 2016	Oct. 02, 2016	Dec. 31, 2015
Goodwill [Line Items]
Foreign currency translation adjustment		$ 5,122
Goodwill impairment loss		254,946
Goodwill		1,001,155	$ 996,033
Accumulated impairment losses		(762,566)	(507,620)
Goodwill		238,589	488,413
Semiconductor Test
Goodwill [Line Items]
Goodwill		260,540	260,540
Accumulated impairment losses		(260,540)	(260,540)
Industrial Automation
Goodwill [Line Items]
Foreign currency translation adjustment		5,122
Goodwill		220,097	214,975
Goodwill		220,097	214,975
System Test
Goodwill [Line Items]
Goodwill		158,699	158,699
Accumulated impairment losses		(148,183)	(148,183)
Goodwill		10,516	10,516
Wireless Test
Goodwill [Line Items]
Goodwill impairment loss	$ 254,946	254,946
Goodwill		361,819	361,819
Accumulated impairment losses		(353,843)	(98,897)
Goodwill	$ 7,976	$ 7,976	$ 262,922

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Oct. 02, 2016		Dec. 31, 2015
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 497,547	[1]	$ 546,388	[2]
Accumulated Amortization	382,428	[1],[3]	303,227	[2]
Foreign Currency Translation Adjustment	(973)		(3,330)
Net Carrying Amount	$ 114,146		$ 239,831
Weighted Average Useful Life, years	6 years 9 months 18 days		6 years 8 months 12 days
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 333,421	[1]	$ 382,262	[2]
Accumulated Amortization	264,248	[1],[3]	220,346	[2]
Foreign Currency Translation Adjustment	(714)		(2,444)
Net Carrying Amount	$ 68,459		$ 159,472
Weighted Average Useful Life, years	6 years		6 years
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 110,602	[1]	$ 110,602	[2]
Accumulated Amortization	92,139	[1],[3]	63,722	[2]
Foreign Currency Translation Adjustment	(75)		(258)
Net Carrying Amount	$ 18,388		$ 46,622
Weighted Average Useful Life, years	7 years 10 months 24 days		7 years 10 months 24 days
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 53,034	[1]	$ 53,034	[2]
Accumulated Amortization	25,711	[1],[3]	18,889	[2]
Foreign Currency Translation Adjustment	(184)		(628)
Net Carrying Amount	$ 27,139		$ 33,517
Weighted Average Useful Life, years	9 years 6 months		9 years 6 months
Non-compete agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 320	[1]	$ 320	[2]
Accumulated Amortization	160	[1],[3]	100	[2]
Net Carrying Amount	$ 160		$ 220
Weighted Average Useful Life, years	4 years		4 years
Customer backlog
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 170	[1]	$ 170	[2]
Accumulated Amortization	$ 170	[1],[3]	$ 170	[2]
Weighted Average Useful Life, years	3 months 18 days		3 months 18 days
[1]	In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[2]	In 2015, $98.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[3]	Includes an $83 million impairment of Wireless Test amortizable intangible assets.

Schedule of Amortizable Intan70

Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 03, 2016	Oct. 02, 2016		Dec. 31, 2015
Finite-Lived Intangible Assets
Gross Carrying Amount		$ 497,547	[1]	$ 546,388	[2]
Accumulated Amortization		382,428	[1],[3]	303,227	[2]
Net Carrying Amount		114,146		239,831
Intangible assets impairment		83,339
Wireless Test
Finite-Lived Intangible Assets
Net Carrying Amount	$ 5,800
Intangible assets impairment	$ 83,000	83,339
Fully Amortized Intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount		48,000		98,200
Accumulated Amortization		48,000		98,200
Net Carrying Amount		$ 0		$ 0
[1]	In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[2]	In 2015, $98.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[3]	Includes an $83 million impairment of Wireless Test amortizable intangible assets.

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Oct. 02, 2016USD ($)
Finite-Lived Intangible Assets
2016 (remainder)	$ 8,084
2,017	30,552
2,018	28,270
2,019	24,364
2,020	10,684
Thereafter	$ 12,192

Computation of Basic and Dilute

Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Net Income Loss Per Common Share
Net income (loss) for basic and diluted net income per share	$ 63,794	$ 71,453	$ (109,767)	$ 207,118
Weighted average common shares-basic	202,211	210,032	203,167	213,688
Employee stock purchase plan	15	23		40
Dilutive potential common shares	1,718	1,704		1,660
Weighted average common shares-diluted	203,929	211,736	203,167	215,348
Net income (loss) per common share-basic	$ 0.32	$ 0.34	$ (0.54)	$ 0.97
Net income (loss) per common share-diluted	$ 0.31	$ 0.34	$ (0.54)	$ 0.96
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements	1,282	1,103		994
Stock Options
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements	421	578		626

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 04, 2015
Net Income Loss Per Common Share
Exercise of stock options	0.1	0.2	0.2

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) $ in Thousands	Apr. 16, 2016USD ($)Utility	Oct. 02, 2016USD ($)Employee	Jul. 03, 2016USD ($)	Oct. 04, 2015USD ($)Employee	Oct. 02, 2016USD ($)Employee	Oct. 04, 2015USD ($)Employee
Restructuring Cost and Reserve
Property insurance, recovery			$ 5,400
Contingent consideration adjustment		$ 8,000			$ 10,451	$ (2,600)
Impairment of fixed assets and expenses related to the Japan earthquake
Restructuring Cost and Reserve
Number of remaining utilities | Utility	0
Building impairment and other expenses					5,400
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses [Member]
Restructuring Cost and Reserve
Building impairment and other expenses		300			1,200
Impairment of fixed assets and expenses related to the Japan earthquake | Buildings
Restructuring Cost and Reserve
Building impairment and other expenses					4,200
Earthquake
Restructuring Cost and Reserve
Earthquake insurance	$ 10,000
Insurance deductible	$ 2,500
System Test
Restructuring Cost and Reserve
Severance benefit and charges				$ 1,100		$ 1,400
Reduction in employees headcount | Employee				18		22
Semiconductor Test and Wireless Test
Restructuring Cost and Reserve
Severance benefit and charges		$ 4,200			$ 5,900
Reduction in employees headcount | Employee		72			146
Wireless Test
Restructuring Cost and Reserve
Reduction in employees headcount | Employee		55			102
Semiconductor Test
Restructuring Cost and Reserve
Reduction in employees headcount | Employee		17			44
ZTEC Instruments, Inc.
Restructuring Cost and Reserve
Contingent consideration adjustment						$ (1,600)
Universal Robots
Restructuring Cost and Reserve
Contingent consideration adjustment		$ 8,000			$ 9,900
Acquisition related costs				$ 100		1,100
Avionics Interface Technologies, LLC
Restructuring Cost and Reserve
Contingent consideration adjustment				$ (1,000)	$ 600	$ (1,000)

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015
U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	$ 1.9
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	1.9	$ 1.9
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	$ 1.5	$ 0.6

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement Benefit Cost (Income) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	$ 575	$ 616	$ 1,726	$ 1,847
Interest cost	3,407	3,285	10,222	9,856
Expected return on plan assets	(3,458)	(3,629)	(10,373)	(10,888)
Amortization of prior service cost	24	34	72	101
Actuarial (gain) loss			(1,848)	(3)
Total net periodic	548	306	(201)	913
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	208	259	614	768
Interest cost	209	357	614	1,101
Expected return on plan assets	(6)	(185)	(17)	(595)
Actuarial (gain) loss	662		662
Settlement			(184)
Total net periodic	$ 1,073	$ 431	$ 1,689	$ 1,274

Schedule of Net Periodic Pens77

Schedule of Net Periodic Pension and Postretirement (Income) Cost (Detail) - Postretirement Benefit Plans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Defined Benefit Plan Disclosure
Service cost	$ 9	$ 12	$ 28	$ 36
Interest cost	54	59	163	177
Amortization of prior service credit	(151)	(150)	(455)	(449)
Actuarial (gain) loss			(15)	(19)
Total net periodic	$ (88)	$ (79)	$ (279)	$ (255)

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Oct. 02, 2016USD ($)
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments	$ 181.4
Purchase commitments less than one year	$ 179

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2015
Income Taxes [Line Items]
Effective tax rate	(6.90%)	18.30%	3.70%	20.90%
U.S. statutory federal tax rate	35.00%	35.00%	35.00%	35.00%
Discrete tax benefits	$ 6.4	$ 3.3	$ 13.3	$ 5
Out-of-period adjustments	3.1		3.1
Discrete tax benefits related to tax credit carryforwards	1.6		1.6
Gains on non-taxable foreign exchange	0.7		4.1
Other discrete tax benefits	1	0.9	1	1
Tax reserve releases resulting from the settlement of a U.S. tax audit			2.6
Marketable securities			0.9
Discrete tax benefit attributable to a United States tax court opinion regarding intercompany cost sharing arrangements		1.8		1.8
Decrease in uncertain tax position resulting from expiration of statutes of limitations		$ 0.6	4.4	1.3
Discrete tax benefit related to disqualifying dispositions of incentive stock options and employee stock purchase plan shares				0.9
Uncertain tax positions	34.7		34.7		$ 33.7
Net Increase in uncertain tax positions			1
Accrued interest and penalties	$ 0.8		0.8		$ 0.5
Interest and penalties related to income tax			0.3	0.3
Tax savings due to the tax holiday			$ 25.2	$ 9.9
Tax savings due to the tax holiday, per share			$ 0.12	$ 0.05
Tax holiday expiration date			December 31, 2020

Segment Information - Additiona

Segment Information - Additional Information (Detail)	9 Months Ended
	Oct. 02, 2016Segment
Segment Reporting Information [Line Items]
Operating segments	4

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Oct. 02, 2016		Oct. 04, 2015		Oct. 02, 2016		Oct. 04, 2015		Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues		$ 410,475		$ 465,994		$ 1,373,261		$ 1,321,133
Income (loss) before income taxes	[1],[2]	59,681		87,408		(113,945)		261,981
Total assets		2,365,687	[3]	2,661,884	[3]	2,365,687	[3]	2,661,884	[3]	$ 2,548,674
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		322,021		325,516		1,097,608		996,748
Income (loss) before income taxes	[1],[2]	67,710		73,957		262,127		246,627
Total assets	[3]	522,529		591,445		522,529		591,445
System Test
Segment Reporting Information [Line Items]
Revenues		37,030		69,062		139,640		152,320
Income (loss) before income taxes	[1],[2]	1,550		13,751		20,033		10,423
Total assets	[3]	90,713		109,078		90,713		109,078
Wireless Test
Segment Reporting Information [Line Items]
Revenues		27,919		55,359		70,660		152,285
Income (loss) before income taxes	[1],[2]	1,049		2,997		(375,596)		(603)
Total assets	[3]	65,953		447,461		65,953		447,461
Industrial Automation
Segment Reporting Information [Line Items]
Revenues		23,505		16,057		65,353		19,780
Income (loss) before income taxes	[1],[2]	(4,695)		(4,847)		(16,364)		(6,547)
Total assets	[3]	340,030		360,068		340,030		360,068
Corporate And Eliminations
Segment Reporting Information [Line Items]
Income (loss) before income taxes	[1],[2]	(5,933)		1,550		(4,145)		12,081
Total assets	[3]	$ 1,346,462		$ 1,153,832		$ 1,346,462		$ 1,153,832
[1]	Included in the income (loss) before income taxes for each of the segments are charges related to inventory and other.
[2]	Interest income, interest expense, and other (income) expense, net are included in Corporate and Eliminations.
[3]	Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

Schedule of Segment Reporting I

Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Oct. 02, 2016	Jul. 03, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Segment Reporting Information [Line Items]
Goodwill impairment					$ 254,946
Intangible assets impairment					83,339
Restructuring and other		$ 12,177		$ 261	16,372	$ (124)
Contingent consideration adjustment		8,000			10,451	(2,600)
Property insurance recovery					(5,363)
Other (income) expense, net-Gain from the sale of an equity investment						(5,406)
Universal Robots
Segment Reporting Information [Line Items]
Contingent consideration adjustment		8,000			9,900
Acquisition related costs				100		1,100
Avionics Interface Technologies, LLC
Segment Reporting Information [Line Items]
Contingent consideration adjustment				(1,000)	600	(1,000)
ZTEC Instruments, Inc.
Segment Reporting Information [Line Items]
Contingent consideration adjustment						(1,600)
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge		2,351		1,697	8,270	8,637
Restructuring and other		2,047		194	2,798	499
Total		4,398		1,891	11,068	9,136
Corporate And Eliminations
Segment Reporting Information [Line Items]
Total		7,974		(856)	10,452	(6,902)
Corporate And Eliminations | Restructuring and other
Segment Reporting Information [Line Items]
Property insurance recovery		(312)			(5,363)
Corporate And Eliminations | Other (income) expense, net
Segment Reporting Information [Line Items]
Other (income) expense, net-Gain from the sale of an equity investment						(5,406)
Corporate And Eliminations | Impairment of fixed assets and expenses related to the Japan earthquake | Restructuring and other
Segment Reporting Information [Line Items]
Building impairment and other expenses		312			5,363
Corporate And Eliminations | Universal Robots | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment		7,974			9,902
Acquisition related costs				144		1,104
Corporate And Eliminations | Avionics Interface Technologies, LLC | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment				(1,000)	550	(1,000)
Corporate And Eliminations | ZTEC Instruments, Inc. | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment						(1,600)
Industrial Automation
Segment Reporting Information [Line Items]
Cost of revenues-inventory step-up	[1]			972		1,567
Restructuring and other		532			532
Total		532		972	532	1,567
Wireless Test
Segment Reporting Information [Line Items]
Goodwill impairment			$ 254,946		254,946
Intangible assets impairment			$ 83,000		83,339
Cost of revenues-inventory charge		561		901	6,437	2,077
Restructuring and other		1,672			2,639
Total		$ 2,233		$ 901	$ 347,361	$ 2,077
[1]	Included in the cost of revenues for the three and nine months ended October 4, 2015 is the cost for purchase accounting inventory step-up.

Schedule of Segment Reporting83

Schedule of Segment Reporting Information by Segment Charges and Credit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Segment Reporting Information [Line Items]
Restructuring and other	$ 12,177	$ 261	$ 16,372	$ (124)
System Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	121	460	441	8,225
Restructuring and other	(48)	923	(48)	923
Total	$ 73	$ 1,383	$ 393	$ 9,148

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended		12 Months Ended		21 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Oct. 02, 2016	Aug. 31, 2016	May 31, 2016	Jan. 31, 2016	Aug. 31, 2015	May 31, 2015	Jan. 31, 2015
Stockholders Equity Note Disclosure [Line Items]
Repurchase of stock, value			$ 85,100,000			$ 300,000,000
Repurchase of stock, shares			4.3
Cumulative repurchases, shares	19.9		19.9				19.9
Cumulative repurchases, value	$ 385,000,000		$ 385,000,000				$ 385,000,000
Common stock average price			$ 19.69				$ 19.31
Dividends payable, amount per share								$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06
Dividend payment	$ 12,100,000	$ 12,600,000	$ 36,548,000	$ 38,434,000
Maximum
Stockholders Equity Note Disclosure [Line Items]
Stock repurchase program, authorized amount													$ 500,000,000
Maximum | Scenario, Forecast
Stockholders Equity Note Disclosure [Line Items]
Repurchase of stock, value					$ 200,000,000
Minimum | Scenario, Forecast
Stockholders Equity Note Disclosure [Line Items]
Repurchase of stock, value					$ 100,000,000