Teradyne (TER) 10-Q 13 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 03, 2016	May. 06, 2016
Document Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 3, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
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		203,178,976

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 03, 2016		Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 319,358		$ 264,705
Marketable securities	410,003		477,696
Accounts receivable, less allowance for doubtful accounts of $2,385 and $2,407 at April 3, 2016 and December 31, 2015, respectively	253,976		211,293
Inventories, net:
Parts	59,425		73,117
Assemblies in process	38,490		32,825
Finished goods	62,772		47,646
Inventory, Net, Total	160,687		153,588
Deferred tax assets			54,973
Prepayments	95,185		91,519
Other current assets	3,513		6,194
Total current assets	1,242,722		1,259,968
Property, plant and equipment, net	266,907		273,414
Marketable securities	246,072		265,928
Deferred tax assets	59,119		7,404
Other assets	13,041		13,080
Retirement plans assets	1,968		636
Intangible assets, net	223,274		239,831
Goodwill	495,871		488,413
Total assets	2,548,974	[1]	2,548,674
Current liabilities:
Accounts payable	84,104		92,358
Accrued employees' compensation and withholdings	71,838		113,994
Deferred revenue and customer advances	72,095		85,527
Other accrued liabilities	92,617		43,727
Contingent consideration	500		15,500
Accrued income taxes	23,368		21,751
Total current liabilities	344,522		372,857
Long-term deferred revenue and customer advances	25,468		25,745
Retirement plans liabilities	106,921		103,531
Deferred tax liabilities	18,300		26,663
Long-term other accrued liabilities	34,753		32,156
Long-term contingent consideration	23,109		21,936
Total liabilities	$ 553,073		$ 582,888
Commitments and contingencies (See Note P)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 203,707 and 203,641 shares issued and outstanding at April 3, 2016 and December 31, 2015, respectively	$ 25,462		$ 25,455
Additional paid-in capital	1,489,011		1,480,647
Accumulated other comprehensive income (loss)	5,035		(8,144)
Retained earnings	476,393		467,828
Total shareholders' equity	1,995,901		1,965,786
Total liabilities and shareholders' equity	$ 2,548,974		$ 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	Apr. 03, 2016	Dec. 31, 2015
Accounts receivable, less allowance for doubtful accounts	$ 2,385	$ 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	203,707,000	203,641,000
Common stock, shares outstanding	203,707,000	203,641,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Revenues:
Products	$ 358,139	$ 272,325
Services	72,855	70,076
Total revenues	430,994	342,401
Cost of revenues:
Cost of products	167,555	118,996
Cost of services	33,107	30,982
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	200,662	149,978
Gross profit	230,332	192,423
Operating expenses:
Engineering and development	73,464	71,450
Selling and administrative	79,174	72,041
Acquired intangible assets amortization	19,994	13,808
Restructuring and other	1,587
Total operating expenses	174,219	157,299
Income from operations	56,113	35,124
Non-operating (income) expenses:
Interest income	(1,642)	(1,816)
Interest expense	710	162
Other (income) expense, net	(147)	(5,660)
Income before income taxes	57,192	42,438
Income tax provision	7,206	9,651
Net income	$ 49,986	$ 32,787
Net income per common share:
Basic	$ 0.24	$ 0.15
Diluted	$ 0.24	$ 0.15
Weighted average common shares-basic	204,271	217,187
Weighted average common shares-diluted	205,732	218,812
Cash dividend declared per common share	$ 0.06	$ 0.06

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2016	Apr. 05, 2015
Net income		$ 49,986	$ 32,787
Other comprehensive income, net of tax:
Foreign currency translation adjustments		10,271
Available-for-sale marketable securities:
Unrealized gains on marketable securities arising during period, net of tax of $1,253, $704, respectively		3,071	1,799
Less: Reclassification adjustment for gains included in net income, net of tax of $11, $(169), respectively		(83)	(330)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total		2,988	1,469
Defined benefit pension and post-retirement plans:
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax of $(46), $(42), respectively	[1]	(80)	(74)
Other comprehensive income		13,179	1,395
Comprehensive income		$ 63,165	$ 34,182
[1]	The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note O: "Retirement Plans."

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Unrealized gains on marketable securities arising during period, tax	$ 1,253	$ 704
Amounts reclassified from accumulated other comprehensive income, tax	11	(169)
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, tax	$ (46)	$ (42)

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Cash flows from operating activities:
Net income	$ 49,986	$ 32,787
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	16,192	19,345
Amortization	20,470	15,139
Stock-based compensation	7,925	7,963
Provision for excess and obsolete inventory	4,373	1,440
Contingent consideration adjustment	1,173
Deferred taxes	(5,496)	(1,831)
Retirement plans actuarial gains	(1,193)
Gain from the sale of an equity investment		(4,782)
Other	484	(1,417)
Changes in operating assets and liabilities:
Accounts receivable	(42,552)	(24,749)
Inventories	(702)	5,960
Prepayments and other assets	(1,148)	3,146
Accounts payable and other accrued expenses	(7,626)	(20,150)
Deferred revenue and customer advances	(13,836)	1,038
Retirement plans contributions	(1,250)	(1,019)
Income taxes	(52)	4,662
Net cash provided by operating activities	26,748	37,532
Cash flows from investing activities:
Purchases of property, plant and equipment	(20,334)	(21,149)
Purchases of available-for-sale marketable securities	(221,778)	(335,635)
Proceeds from sales of available-for-sale marketable securities	239,370	148,639
Proceeds from maturities of available-for-sale marketable securities	73,458	140,222
Proceeds from the sale of an equity investment		4,782
Proceeds from life insurance		1,098
Net cash provided by (used for) investing activities	70,716	(62,043)
Cash flows from financing activities:
Issuance of common stock under employee stock purchase and stock option plans	9,140	8,899
Repurchase of common stock	(28,001)	(46,650)
Dividend payments	(12,253)	(13,049)
Payments of contingent consideration	(11,697)
Net cash used for financing activities	(42,811)	(50,800)
Increase (decrease) in cash and cash equivalents	54,653	(75,311)
Cash and cash equivalents at beginning of period	264,705	294,256
Cash and cash equivalents at end of period	$ 319,358	$ 218,945

The Company

The Company	3 Months Ended
	Apr. 03, 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	3 Months Ended
	Apr. 03, 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 presentation 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	3 Months Ended
	Apr. 03, 2016
Recently Issued Accounting Pronouncements	C. Recently Issued Accounting Pronouncements In January 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ” 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 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 May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),”

Acquisitions

Acquisitions	3 Months Ended
	Apr. 03, 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) forecasted 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 earnings before income taxes, depreciation and amortization (“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 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 Three Months Ended April 5, 2015 Revenue $ 352,971 Net income 28,374 Net income per common share: Basic $ 0.13 Diluted $ 0.13

Financial Instruments and Deriv

Financial Instruments and Derivatives	3 Months Ended
	Apr. 03, 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 Accounting Standards Codification (“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 months ended April 3, 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 months ended April 3, 2016 and April 5, 2015 were $0.2 million and $0.5 million, respectively. Realized losses recorded in the three months ended April 3, 2016 were $0.2 million. There were no realized losses recorded in the three months ended April 5, 2015. 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 months ended April 3, 2016 and April 5, 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 April 3, 2016 and December 31, 2015. April 3, 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 $ 227,046 $ — $ — $ 227,046 Cash equivalents 92,010 302 — 92,312 Available-for-sale securities: U.S. Treasury securities — 399,277 — 399,277 Corporate debt securities — 161,590 — 161,590 Commercial paper — 36,592 — 36,592 U.S. government agency securities — 26,160 — 26,160 Certificates of deposit and time deposits — 15,653 — 15,653 Equity and debt mutual funds 16,369 — — 16,369 Non-U.S. government securities — 434 — 434 Total $ 335,425 $ 640,008 $ — $ 975,433 Liabilities Contingent consideration $ — $ — $ 23,609 $ 23,609 Derivative liabilities — 193 — 193 Total $ — $ 193 $ 23,609 $ 23,802 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 319,056 $ 302 $ — $ 319,358 Marketable securities — 410,003 — 410,003 Long-term marketable securities 16,369 229,703 — 246,072 $ 335,425 $ 640,008 $ — $ 975,433 Liabilities Other current liabilities $ — $ 193 $ — $ 193 Contingent consideration — — 500 500 Long-term contingent consideration — — 23,109 23,109 $ — $ 193 $ 23,609 $ 23,802 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 current 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 months ended April 3, 2016 and April 5, 2015 were as follows: For the Three Months April 3, 2016 April 5, 2015 (in thousands) Balance at beginning of period $ 37,436 $ 3,350 Payments (a) (15,000 ) — Fair value adjustment (b) 1,173 — Balance at end of period $ 23,609 $ 3,350 (a) In the three months ended April 3, 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 months ended April 3, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $1.2 million primarily due to a lower discount rate. The following table provides quantitative information associated with the fair value measurement of Teradyne’s Level 3 financial instruments: Liability April 3, 2016 Valuation Unobservable Inputs Weighted (in thousands) Contingent consideration (Universal Robots) $16,349 Monte Carlo Revenue for the period July 1, 2015—December 31, 2017 volatility 15.4 % Discount Rate 4.7 % $6,760 Monte Carlo Revenue for the period July 1, 2015—December 31, 2018 volatility 15.4 % Discount Rate 4.7 % Contingent consideration (AIT) $500 Income approach- Revenue for calendar year 2016 probability Discount rate 48 4.7 % % As of April 3, 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 Avionics Interface Technology, LLC (“AIT”) fair value measurement of contingent consideration are the probabilities of successful achievement of 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 $1.1 million. The carrying amounts and fair values of Teradyne’s financial instruments at April 3, 2016 and December 31, 2015 were as follows: April 3, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 319,358 $ 319,358 $ 264,705 $ 264,705 Marketable securities 656,075 656,075 743,624 743,624 Derivative assets — — 109 109 Liabilities Contingent consideration 23,609 23,609 37,436 37,436 Derivative liabilities 193 193 146 146 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 April 3, 2016 and December 31, 2015: April 3, 2016 Available-for-Sale Fair Market Cost Unrealized Unrealized Fair Market (in thousands) U.S. Treasury securities $ 398,832 $ 620 $ (175 ) $ 399,277 $ 204,136 Corporate debt securities 161,005 1,861 (1,276 ) 161,590 73,165 Commercial paper 36,563 29 — 36,592 6,475 U.S. government agency securities 26,107 57 (4 ) 26,160 9,747 Equity and debt mutual funds 15,110 1,328 (69 ) 16,369 746 Certificates of deposit and time deposits 15,651 2 — 15,653 — Non-U.S. government securities 434 — — 434 — $ 653,702 $ 3,897 $ (1,524 ) $ 656,075 $ 294,269 Reported as follows: Cost Unrealized Unrealized Fair Market Fair Market (in thousands) Marketable securities $ 409,971 $ 146 $ (114 ) $ 410,003 $ 204,024 Long-term marketable securities 243,731 3,751 (1,410 ) 246,072 90,245 $ 653,702 $ 3,897 $ (1,524 ) $ 656,075 $ 294,269 December 31, 2015 Available-for-Sale Fair Market Cost Unrealized Unrealized Fair Market (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 Unrealized Fair Market Fair Market (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 April 3, 2016, the fair market value of investments with unrealized losses totaled $294.3 million. Of this value, $2.8 million had unrealized losses of $0.5 million greater than one year and $291.5 million had unrealized losses of $1.1 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 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 April 3, 2016 and December 31, 2015, were temporary. The contractual maturities of investments held at April 3, 2016 were as follows: April 3, 2016 Cost Fair Market (in thousands) Due within one year $ 409,971 $ 410,003 Due after 1 year through 5 years 184,645 184,852 Due after 5 years through 10 years 4,432 4,546 Due after 10 years 39,544 40,305 Total $ 638,592 $ 639,706 Contractual maturities of investments held at April 3, 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 was $138.5 million and $114.1 million at April 3, 2016 and December 31, 2015, respectively. The fair value of the outstanding contracts was a loss of $0.2 million and $0.0 million at April 3, 2016 and December 31, 2015, respectively. For the three months ended April 3, 2016 and April 5, 2015, Teradyne recorded net realized losses of $3.3 million and $3.4 million, respectively, related to foreign currency forward contracts hedging net monetary positions. Gains and losses on foreign currency forward contracts and foreign currency remeasurement gains and losses on monetary assets and liabilities are included in other (income) expense, net. The following table summarizes the fair value of derivative instruments at April 3, 2016 and December 31, 2015: Balance Sheet Location April 3, 2016 December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts assets Prepayments $ — $ 109 Foreign exchange contracts liabilities Other current liabilities (193 ) (146 ) Total derivatives $ (193 ) $ (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 months ended April 3, 2016 and April 5, 2015. The table does not reflect the corresponding gains and losses from the remeasurement of monetary assets and liabilities denominated in foreign currencies. For the three months ended April 3, 2016 and April 5, 2015, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $3.4 million and $4.3 million, respectively. Location of (Gains) Losses Statement of Operations For the Three Months April 3, 2016 April 5, 2015 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ 3,298 $ 3,425 Total Derivatives $ 3,298 $ 3,425

Debt

Debt	3 Months Ended
	Apr. 03, 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 May 13, 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 April 3, 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	3 Months Ended
	Apr. 03, 2016
Prepayments	G. Prepayments Prepayments consist of the following and are included in prepayments on the balance sheet: April 3, 2016 December 31, (in thousands) Contract manufacturer prepayments $ 68,746 $ 66,283 Prepaid maintenance and other services 7,061 8,481 Prepaid taxes 5,281 3,781 Other prepayments 14,097 12,974 Total prepayments $ 95,185 $ 91,519

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances	3 Months Ended
	Apr. 03, 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: April 3, 2016 December 31, (in thousands) Extended warranty $ 46,115 $ 46,499 Product maintenance and training 31,368 30,616 Customer advances 5,347 17,456 Undelivered elements and other 14,733 16,701 Total deferred revenue and customer advances $ 97,563 $ 111,272

Product Warranty

Product Warranty	3 Months Ended
	Apr. 03, 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 April 3, 2016 April 5, 2015 (in thousands) Balance at beginning of period $ 6,925 $ 8,942 Accruals for warranties issued during the period 3,490 2,361 Adjustments related to pre-existing warranties 243 (1,031 ) Settlements made during the period (3,162 ) (2,849 ) Balance at end of period $ 7,496 $ 7,423 When Teradyne receives revenue for extended warranty 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 April 3, 2016 April 5, 2015 (in thousands) Balance at beginning of period $ 46,499 $ 43,300 Deferral of new extended warranty revenue 6,827 4,204 Recognition of extended warranty deferred revenue (7,211 ) (6,800 ) Balance at end of period $ 46,115 $ 40,704

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 03, 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 three months ended April 3, 2016 and April 5, 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 Three Months April 3, 2016 April 5, 2015 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 three months ended April 3, 2016, Teradyne granted 0.1 million PBIT PRSUs with a grant date fair value of $18.71. During the three months ended April 3, 2016, Teradyne granted 1.2 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $18.47 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 three months ended April 5, 2015, Teradyne granted 1.4 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $17.14 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. 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 Three Months April 3, 2016 April 5, 2015 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	3 Months Ended
	Apr. 03, 2016
Accumulated Other Comprehensive Income	K. Accumulated Other Comprehensive Income Changes in accumulated other comprehensive income, which is presented net of tax, consist of the following: For the Three Months Foreign Unrealized Retirement 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, $1,253 10,271 3,071 — 13,342 Amounts reclassified from accumulated other comprehensive income, net of tax of $11, $(46) — (83 ) (80 ) (163 ) Net current period other comprehensive income, net of tax of $0, $1,264, $(46) 10,271 2,988 (80 ) 13,179 Balance at April 3, 2016, net of tax of $0, $805, $(668) $ 1,512 $ 1,574 $ 1,949 $ 5,035 For the Three Months Foreign Unrealized Retirement Total (in thousands) Balance at December 31, 2014, net of tax of $1,598, $(453) $ — $ 2,365 $ 2,324 $ 4,689 Other comprehensive income before reclassifications, net of tax of $704 — 1,799 — 1,799 Amounts reclassified from accumulated other comprehensive income, net of tax of $(169), $(42) — (330 ) (74 ) (404 ) Net current period other comprehensive income, net of tax of $535, $(42) — 1,469 (74 ) 1,395 Balance at April 5, 2015, net of tax of $2,133, $(495) $ — $ 3,834 $ 2,250 $ 6,084 Reclassifications out of accumulated other comprehensive income to the statement of operations for the three months ended April 3, 2016 and April 5, 2015 were as follows: Details about Accumulated Other Comprehensive Income Components For the Three Months Affected Line Item April 3, 2016 April 5, 2015 (in thousands) Available-for-sale marketable securities: Unrealized gains, net of tax of $(11), $169 $ 83 $ 330 Interest income Amortization of defined benefit pension and postretirement plans: Prior service benefit, net of tax of $46, $42 80 74 (a) Total reclassifications, net of tax of $35, $211 $ 163 $ 404 Net income (a) The amortization of prior service benefit 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	3 Months Ended
	Apr. 03, 2016
Goodwill and Intangible Assets	L. Goodwill and Intangible Assets The changes in the carrying amount of goodwill by reportable segments for the three months ended April 3, 2016, were as follows: Wireless Industrial System Semiconductor 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 — 7,458 — — 7,458 Balance at April 3, 2016: Goodwill 361,819 222,433 158,699 260,540 1,003,491 Accumulated impairment losses (98,897 ) — (148,183 ) (260,540 ) (507,620 ) $ 262,922 $ 222,433 $ 10,516 $ — $ 495,871 Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: April 3, 2016 Gross Accumulated Net Weighted (in thousands) Developed technology $ 333,947 $ 186,118 $ 147,829 6.0 years Customer relationships 110,658 68,114 42,544 7.9 years Tradenames and trademarks 53,169 20,468 32,701 9.5 years Non-compete agreement 320 120 200 4.0 years Customer backlog 170 170 — 0.3 years Total intangible assets $ 498,264 $ 274,990 $ 223,274 6.8 years December 31, 2015 Gross Accumulated Net Weighted (in thousands) Developed technology $ 379,778 $ 220,306 $ 159,472 6.0 years Customer relationships 110,340 63,718 46,622 7.9 years Tradenames and trademarks 52,396 18,879 33,517 9.5 years Non-compete agreement 320 100 220 4.0 years Customer backlog 170 170 — 0.3 years Total intangible assets $ 543,004 $ 303,173 $ 239,831 6.7 years Aggregate intangible asset amortization expense was $20.0 million and $13.8 million, respectively, for the three months ended April 3, 2016 and April 5, 2015. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2016 (remainder) $ 60,547 2017 71,899 2018 45,160 2019 24,260 2020 10,304 Thereafter 11,104

Net Income per Common Share

Net Income per Common Share	3 Months Ended
	Apr. 03, 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 April 3, 2016 April 5, 2015 (in thousands, except per Net income for basic and diluted net income per share $ 49,986 $ 32,787 Weighted average common shares-basic 204,271 217,187 Effect of dilutive potential common shares: Restricted stock units 965 901 Stock options 487 696 Employee stock purchase plan 9 28 Dilutive potential common shares 1,461 1,625 Weighted average common shares-diluted 205,732 218,812 Net income per common share-basic $ 0.24 $ 0.15 Net income per common share-diluted $ 0.24 $ 0.15 The computation of diluted net income per common share for the three months ended April 3, 2016 excludes the effect of the potential exercise of stock options to purchase approximately 0.3 million shares because the effect would have been anti-dilutive. The computation of diluted net income per common share for the three months ended April 5, 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	3 Months Ended
	Apr. 03, 2016
Restructuring and Other	N. Restructuring and Other Other During the three months ended April 3, 2016, Teradyne recorded an expense of $1.2 million for the increase in the fair value of the Universal Robots contingent consideration liability. Restructuring During the three months ended April 3, 2016, Teradyne recorded $0.4 million of severance charges related to headcount reductions of 12 people, primarily in Semiconductor Test.

Retirement Plans

Retirement Plans	3 Months Ended
	Apr. 03, 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 three months ended April 3, 2016, Teradyne contributed $0.7 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 months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic pension (income) cost was comprised of the following: For the Three Months Ended April 3, 2016 April 5, 2015 United Foreign United Foreign (in thousands) Service cost $ 576 $ 207 $ 616 $ 247 Interest cost 3,414 206 3,282 358 Expected return on plan assets (3,443 ) (5 ) (3,624 ) (195 ) Amortization of prior service cost 24 — 33 — Net actuarial gain (1,193 ) — — — Settlement — (239 ) — — Total net periodic pension (income) cost $ (622 ) $ 169 $ 307 $ 410 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 ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic postretirement benefit income was comprised of the following: For the Three Months April 3, 2016 April 5, 2015 (in thousands) Service cost $ 10 $ 12 Interest cost 56 59 Amortization of prior service benefit (150 ) (149 ) Total net periodic post-retirement benefit $ (84 ) $ (78 )

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 03, 2016
Commitments and Contingencies	P. Commitments and Contingencies Purchase Commitments As of April 3, 2016, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $235.3 million, of which $233.7 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	3 Months Ended
	Apr. 03, 2016
Income Taxes	Q. Income Taxes The effective tax rate for the three months ended April 3, 2016 and April 5, 2015 was 12.6% and 22.7%, respectively. The effective tax rates for these periods were lower than 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 tax rate for the three months ended April 3, 2016 was also reduced by the benefit from U.S. research and development tax credits, partially offset by additions to the uncertain tax positions for transfer pricing, both of which are included in the projected annual effective tax rate. Discrete tax benefits recorded in the quarter amounted to $2.5 million of which $1.2 million resulted from non-taxable foreign exchange gains, $0.9 million related to marketable securities and $0.4 million from other discrete tax benefits. The tax rate for the three months ended April 5, 2015 was reduced by a $1.2 million discrete tax benefit related to non-taxable foreign exchange gains and a $0.5 million discrete tax benefit related to disqualifying dispositions of incentive stock options and employee stock purchase plan shares. 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 April 3, 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 April 3, 2016 and December 31, 2015, Teradyne had $35.2 million and $33.7 million, respectively, of reserves for uncertain tax positions. The $1.5 million net increase in reserves for uncertain tax positions relates primarily to transfer pricing exposure. As of April 3, 2016, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $9.1 million in the next twelve months, as a result of a lapse of statutes of limitation and the settlement of a tax audit. The estimated decrease is composed primarily of reserves relating to federal tax credits and transfer pricing. Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of April 3, 2016 and December 31, 2015, $0.8 million and $0.5 million, respectively, of interest and penalties were included in the reserve for uncertain tax positions. For the three months ended April 3, 2016, expense of $0.3 million was recorded for interest and penalties related to income tax items. For the three months ended April 5, 2015, interest and penalties related to income tax items were not material. 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 three months ended April 3, 2016 was $2.6 million, or $0.01 per diluted share. The tax savings due to the tax holiday for the three months ended April 5, 2015 was $1.1 million and the impact of the tax holiday on earnings per share was not material. The tax holiday is scheduled to expire on December 31, 2020.

Segment Information

Segment Information	3 Months Ended
	Apr. 03, 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 ended April 3, 2016 and April 5, 2015 is as follows: Semiconductor System Wireless Industrial Corporate Consolidated (in thousands) Three months ended April 3, 2016: Revenues $ 340,264 $ 53,670 $ 20,314 $ 16,746 $ — $ 430,994 Income (loss) before income taxes (1)(2) 73,254 9,492 (20,140 ) (7,168 ) 1,754 57,192 Total assets (3) 664,555 90,695 408,466 350,589 1,034,669 2,548,974 Three months ended April 5, 2015: Revenues $ 270,917 $ 37,436 $ 34,048 $ — $ — $ 342,401 Income (loss) before income taxes (1)(2) 43,125 1,005 (10,441 ) — 8,749 42,438 Total assets (3) 596,477 94,133 465,465 — 1,356,107 2,512,182 (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 April 3, 2016 April 5, 2015 (in thousands) Cost of revenues—inventory charge $ 3,685 $ 531 Restructuring and other 414 — Total $ 4,099 $ 531 Included in the Wireless Test segment are charges in the following line items in the statements of operations: For the Three Months April 3, 2016 April 5, 2015 (in thousands) Cost of revenues—inventory charge $ 605 $ 846 Total $ 605 $ 846 Included in Corporate and Eliminations are charges and credits in the following line items in the statements of operations: For the Three Months April 3, 2016 April 5, 2015 (in thousands) Restructuring and other—Universal Robots contingent consideration adjustment $ 1,173 $ — Other (income) expense, net—gain from the sale of an equity investment — (4,782 ) Total $ 1,173 $ (4,782 )

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Apr. 03, 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 three months ended April 3, 2016, Teradyne repurchased 1.5 million shares of common stock at an average price of $18.81, for a total cost of $28.0 million. The cumulative repurchases as of April 3, 2016 totaled 17.1 million shares of common stock for a total purchase price of $328 million at an average price per share of $19.17. 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, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.06 per share that was paid on March 21, 2016 to shareholders of record as of February 26, 2016. Dividend payments for the three months ended April 3, 2016 were $12.3 million. In January 2015, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.06 per share that was paid on March 24, 2015 to shareholders of record as of February 27, 2015. Dividend payments for the three months ended April 5, 2015 were $13.0 million. 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.

Subsequent Events

Subsequent Events	3 Months Ended
	Apr. 03, 2016
Subsequent Events	T. Subsequent Events On April 16, 2016, an earthquake in Kumamoto, Japan damaged Teradyne’s facility. The facility, which is used for engineering, production, and support operations, sustained heavy damage. Teradyne is still in the process of assessing the total impact of the damage. The net book value of the inventory and fixed assets at the Kumamoto location is approximately $17 million. With respect to the location, Teradyne has $10 million of earthquake insurance with a deductible of approximately $2.5 million. Teradyne is temporarily transferring some operations to other facilities in Japan and elsewhere while Teradyne’s Kumamoto operations are restored.

Accounting Policies (Policies)

Accounting Policies (Policies)	3 Months Ended
	Apr. 03, 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 presentation 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	3 Months Ended
	Apr. 03, 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 Three Months Ended April 5, 2015 Revenue $ 352,971 Net income 28,374 Net income per common share: Basic $ 0.13 Diluted $ 0.13

Financial Instruments and Der30

Financial Instruments and Derivatives (Tables)	3 Months Ended
	Apr. 03, 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 April 3, 2016 and December 31, 2015. April 3, 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 $ 227,046 $ — $ — $ 227,046 Cash equivalents 92,010 302 — 92,312 Available-for-sale securities: U.S. Treasury securities — 399,277 — 399,277 Corporate debt securities — 161,590 — 161,590 Commercial paper — 36,592 — 36,592 U.S. government agency securities — 26,160 — 26,160 Certificates of deposit and time deposits — 15,653 — 15,653 Equity and debt mutual funds 16,369 — — 16,369 Non-U.S. government securities — 434 — 434 Total $ 335,425 $ 640,008 $ — $ 975,433 Liabilities Contingent consideration $ — $ — $ 23,609 $ 23,609 Derivative liabilities — 193 — 193 Total $ — $ 193 $ 23,609 $ 23,802 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 319,056 $ 302 $ — $ 319,358 Marketable securities — 410,003 — 410,003 Long-term marketable securities 16,369 229,703 — 246,072 $ 335,425 $ 640,008 $ — $ 975,433 Liabilities Other current liabilities $ — $ 193 $ — $ 193 Contingent consideration — — 500 500 Long-term contingent consideration — — 23,109 23,109 $ — $ 193 $ 23,609 $ 23,802 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 current 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 months ended April 3, 2016 and April 5, 2015 were as follows: For the Three Months April 3, 2016 April 5, 2015 (in thousands) Balance at beginning of period $ 37,436 $ 3,350 Payments (a) (15,000 ) — Fair value adjustment (b) 1,173 — Balance at end of period $ 23,609 $ 3,350 (a) In the three months ended April 3, 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 months ended April 3, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $1.2 million primarily due to a lower discount rate.
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 April 3, 2016 Valuation Unobservable Inputs Weighted (in thousands) Contingent consideration (Universal Robots) $16,349 Monte Carlo Revenue for the period July 1, 2015—December 31, 2017 volatility 15.4 % Discount Rate 4.7 % $6,760 Monte Carlo Revenue for the period July 1, 2015—December 31, 2018 volatility 15.4 % Discount Rate 4.7 % Contingent consideration (AIT) $500 Income approach- Revenue for calendar year 2016 probability Discount rate 48 4.7 % %
Schedule of Carrying Amounts and Fair Values of Financial Instruments	The carrying amounts and fair values of Teradyne’s financial instruments at April 3, 2016 and December 31, 2015 were as follows: April 3, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 319,358 $ 319,358 $ 264,705 $ 264,705 Marketable securities 656,075 656,075 743,624 743,624 Derivative assets — — 109 109 Liabilities Contingent consideration 23,609 23,609 37,436 37,436 Derivative liabilities 193 193 146 146
Schedule of Available-for-Sale Marketable Securities	The following tables summarize the composition of available-for-sale marketable securities at April 3, 2016 and December 31, 2015: April 3, 2016 Available-for-Sale Fair Market Cost Unrealized Unrealized Fair Market (in thousands) U.S. Treasury securities $ 398,832 $ 620 $ (175 ) $ 399,277 $ 204,136 Corporate debt securities 161,005 1,861 (1,276 ) 161,590 73,165 Commercial paper 36,563 29 — 36,592 6,475 U.S. government agency securities 26,107 57 (4 ) 26,160 9,747 Equity and debt mutual funds 15,110 1,328 (69 ) 16,369 746 Certificates of deposit and time deposits 15,651 2 — 15,653 — Non-U.S. government securities 434 — — 434 — $ 653,702 $ 3,897 $ (1,524 ) $ 656,075 $ 294,269 Reported as follows: Cost Unrealized Unrealized Fair Market Fair Market (in thousands) Marketable securities $ 409,971 $ 146 $ (114 ) $ 410,003 $ 204,024 Long-term marketable securities 243,731 3,751 (1,410 ) 246,072 90,245 $ 653,702 $ 3,897 $ (1,524 ) $ 656,075 $ 294,269 December 31, 2015 Available-for-Sale Fair Market Cost Unrealized Unrealized Fair Market (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 Unrealized Fair Market Fair Market (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 April 3, 2016 were as follows: April 3, 2016 Cost Fair Market (in thousands) Due within one year $ 409,971 $ 410,003 Due after 1 year through 5 years 184,645 184,852 Due after 5 years through 10 years 4,432 4,546 Due after 10 years 39,544 40,305 Total $ 638,592 $ 639,706
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value	The following table summarizes the fair value of derivative instruments at April 3, 2016 and December 31, 2015: Balance Sheet Location April 3, 2016 December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts assets Prepayments $ — $ 109 Foreign exchange contracts liabilities Other current liabilities (193 ) (146 ) Total derivatives $ (193 ) $ (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 months ended April 3, 2016 and April 5, 2015. The table does not reflect the corresponding gains and losses from the remeasurement of monetary assets and liabilities denominated in foreign currencies. For the three months ended April 3, 2016 and April 5, 2015, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $3.4 million and $4.3 million, respectively. Location of (Gains) Losses Statement of Operations For the Three Months April 3, 2016 April 5, 2015 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ 3,298 $ 3,425 Total Derivatives $ 3,298 $ 3,425

Prepayments (Tables)

Prepayments (Tables)	3 Months Ended
	Apr. 03, 2016
Schedule of Prepayments	Prepayments consist of the following and are included in prepayments on the balance sheet: April 3, 2016 December 31, (in thousands) Contract manufacturer prepayments $ 68,746 $ 66,283 Prepaid maintenance and other services 7,061 8,481 Prepaid taxes 5,281 3,781 Other prepayments 14,097 12,974 Total prepayments $ 95,185 $ 91,519

Deferred Revenue and Customer32

Deferred Revenue and Customer Advances (Tables)	3 Months Ended
	Apr. 03, 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: April 3, 2016 December 31, (in thousands) Extended warranty $ 46,115 $ 46,499 Product maintenance and training 31,368 30,616 Customer advances 5,347 17,456 Undelivered elements and other 14,733 16,701 Total deferred revenue and customer advances $ 97,563 $ 111,272

Product Warranty (Tables)

Product Warranty (Tables)	3 Months Ended
	Apr. 03, 2016
Other Accrued Liabilities	The warranty balance below is included in other accrued liabilities on the balance sheet. For the Three Months April 3, 2016 April 5, 2015 (in thousands) Balance at beginning of period $ 6,925 $ 8,942 Accruals for warranties issued during the period 3,490 2,361 Adjustments related to pre-existing warranties 243 (1,031 ) Settlements made during the period (3,162 ) (2,849 ) Balance at end of period $ 7,496 $ 7,423
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 April 3, 2016 April 5, 2015 (in thousands) Balance at beginning of period $ 46,499 $ 43,300 Deferral of new extended warranty revenue 6,827 4,204 Recognition of extended warranty deferred revenue (7,211 ) (6,800 ) Balance at end of period $ 46,115 $ 40,704

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 03, 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 Three Months April 3, 2016 April 5, 2015 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 Three Months April 3, 2016 April 5, 2015 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 Comprehensi35

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Apr. 03, 2016
Changes in accumulated other comprehensive income	Changes in accumulated other comprehensive income, which is presented net of tax, consist of the following: For the Three Months Foreign Unrealized Retirement 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, $1,253 10,271 3,071 — 13,342 Amounts reclassified from accumulated other comprehensive income, net of tax of $11, $(46) — (83 ) (80 ) (163 ) Net current period other comprehensive income, net of tax of $0, $1,264, $(46) 10,271 2,988 (80 ) 13,179 Balance at April 3, 2016, net of tax of $0, $805, $(668) $ 1,512 $ 1,574 $ 1,949 $ 5,035 For the Three Months Foreign Unrealized Retirement Total (in thousands) Balance at December 31, 2014, net of tax of $1,598, $(453) $ — $ 2,365 $ 2,324 $ 4,689 Other comprehensive income before reclassifications, net of tax of $704 — 1,799 — 1,799 Amounts reclassified from accumulated other comprehensive income, net of tax of $(169), $(42) — (330 ) (74 ) (404 ) Net current period other comprehensive income, net of tax of $535, $(42) — 1,469 (74 ) 1,395 Balance at April 5, 2015, net of tax of $2,133, $(495) $ — $ 3,834 $ 2,250 $ 6,084
Reclassifications Out of Accumulated Other Comprehensive Income to Statement of Operations	Reclassifications out of accumulated other comprehensive income to the statement of operations for the three months ended April 3, 2016 and April 5, 2015 were as follows: Details about Accumulated Other Comprehensive Income Components For the Three Months Affected Line Item April 3, 2016 April 5, 2015 (in thousands) Available-for-sale marketable securities: Unrealized gains, net of tax of $(11), $169 $ 83 $ 330 Interest income Amortization of defined benefit pension and postretirement plans: Prior service benefit, net of tax of $46, $42 80 74 (a) Total reclassifications, net of tax of $35, $211 $ 163 $ 404 Net income (a) The amortization of prior service benefit 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)	3 Months Ended
	Apr. 03, 2016
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the three months ended April 3, 2016, were as follows: Wireless Industrial System Semiconductor 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 — 7,458 — — 7,458 Balance at April 3, 2016: Goodwill 361,819 222,433 158,699 260,540 1,003,491 Accumulated impairment losses (98,897 ) — (148,183 ) (260,540 ) (507,620 ) $ 262,922 $ 222,433 $ 10,516 $ — $ 495,871
Schedule of Amortizable Intangible Assets	Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: April 3, 2016 Gross Accumulated Net Weighted (in thousands) Developed technology $ 333,947 $ 186,118 $ 147,829 6.0 years Customer relationships 110,658 68,114 42,544 7.9 years Tradenames and trademarks 53,169 20,468 32,701 9.5 years Non-compete agreement 320 120 200 4.0 years Customer backlog 170 170 — 0.3 years Total intangible assets $ 498,264 $ 274,990 $ 223,274 6.8 years December 31, 2015 Gross Accumulated Net Weighted (in thousands) Developed technology $ 379,778 $ 220,306 $ 159,472 6.0 years Customer relationships 110,340 63,718 46,622 7.9 years Tradenames and trademarks 52,396 18,879 33,517 9.5 years Non-compete agreement 320 100 220 4.0 years Customer backlog 170 170 — 0.3 years Total intangible assets $ 543,004 $ 303,173 $ 239,831 6.7 years
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) $ 60,547 2017 71,899 2018 45,160 2019 24,260 2020 10,304 Thereafter 11,104

Net Income per Common Share (Ta

Net Income per Common Share (Tables)	3 Months Ended
	Apr. 03, 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 April 3, 2016 April 5, 2015 (in thousands, except per Net income for basic and diluted net income per share $ 49,986 $ 32,787 Weighted average common shares-basic 204,271 217,187 Effect of dilutive potential common shares: Restricted stock units 965 901 Stock options 487 696 Employee stock purchase plan 9 28 Dilutive potential common shares 1,461 1,625 Weighted average common shares-diluted 205,732 218,812 Net income per common share-basic $ 0.24 $ 0.15 Net income per common share-diluted $ 0.24 $ 0.15

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Apr. 03, 2016
Postretirement Benefit Plans
Net Periodic Pension and Postretirement (Income) Cost	For the three months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic postretirement benefit income was comprised of the following: For the Three Months April 3, 2016 April 5, 2015 (in thousands) Service cost $ 10 $ 12 Interest cost 56 59 Amortization of prior service benefit (150 ) (149 ) Total net periodic post-retirement benefit $ (84 ) $ (78 )
Defined Benefit Pension Plans
Net Periodic Pension and Postretirement (Income) Cost	For the three months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic pension (income) cost was comprised of the following: For the Three Months Ended April 3, 2016 April 5, 2015 United Foreign United Foreign (in thousands) Service cost $ 576 $ 207 $ 616 $ 247 Interest cost 3,414 206 3,282 358 Expected return on plan assets (3,443 ) (5 ) (3,624 ) (195 ) Amortization of prior service cost 24 — 33 — Net actuarial gain (1,193 ) — — — Settlement — (239 ) — — Total net periodic pension (income) cost $ (622 ) $ 169 $ 307 $ 410

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Apr. 03, 2016
Segment Information	Segment information for the three months ended April 3, 2016 and April 5, 2015 is as follows: Semiconductor System Wireless Industrial Corporate Consolidated (in thousands) Three months ended April 3, 2016: Revenues $ 340,264 $ 53,670 $ 20,314 $ 16,746 $ — $ 430,994 Income (loss) before income taxes (1)(2) 73,254 9,492 (20,140 ) (7,168 ) 1,754 57,192 Total assets (3) 664,555 90,695 408,466 350,589 1,034,669 2,548,974 Three months ended April 5, 2015: Revenues $ 270,917 $ 37,436 $ 34,048 $ — $ — $ 342,401 Income (loss) before income taxes (1)(2) 43,125 1,005 (10,441 ) — 8,749 42,438 Total assets (3) 596,477 94,133 465,465 — 1,356,107 2,512,182 (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 April 3, 2016 April 5, 2015 (in thousands) Cost of revenues—inventory charge $ 3,685 $ 531 Restructuring and other 414 — Total $ 4,099 $ 531
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 April 3, 2016 April 5, 2015 (in thousands) Cost of revenues—inventory charge $ 605 $ 846 Total $ 605 $ 846
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 April 3, 2016 April 5, 2015 (in thousands) Restructuring and other—Universal Robots contingent consideration adjustment $ 1,173 $ — Other (income) expense, net—gain from the sale of an equity investment — (4,782 ) Total $ 1,173 $ (4,782 )

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	Jun. 11, 2015	Apr. 03, 2016	Dec. 31, 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

Allocation of Final Purchase Pr

Allocation of Final Purchase Price (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015	Jun. 11, 2015
Business Acquisition [Line Items]
Goodwill	$ 495,871	$ 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	3 Months Ended
	Apr. 05, 2015USD ($)$ / shares
Business Acquisition [Line Items]
Revenue | $	$ 352,971
Net income | $	$ 28,374
Net income per common share, basic | $ / shares	$ 0.13
Net income per common share, diluted | $ / shares	$ 0.13

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 03, 2016	Apr. 05, 2015	Dec. 31, 2015
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized loss	$ 200,000	$ 0
Available-for-sale securities, realized gain	200,000	500,000
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	294,269,000		$ 601,660,000
Fair market value of investments with unrealized losses greater than one year	2,800,000		900,000
Aggregate loss of investments with unrealized losses greater than one year	500,000		500,000
Fair market value of investments with unrealized losses less than one year	291,500,000		600,800,000
Aggregate loss of investments with unrealized losses less than one year	1,100,000		3,600,000
Gains (losses) on foreign currency transactions	3,400,000	4,300,000
Realized gain(loss) on foreign currency contracts	(3,300,000)	$ (3,400,000)
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	1,100,000
Foreign Currency Forward Contracts
Financial Instruments and Fair Value [Line Items]
Notional amount of foreign currency forward contracts	138,500,000		114,100,000
Gains (losses) on foreign currency transactions	$ (200,000)		$ 0

Schedule of Fair Value of Finan

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 656,075	$ 743,624
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	399,277	419,958
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	161,590	161,634
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	26,160	83,952
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	15,653	43,394
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	36,592	20,308
Equity And Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	16,369	13,954
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	434	424
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	975,433	1,008,329
Derivative assets		109
Total	975,433	1,008,438
Contingent consideration	23,609	37,436
Derivative liabilities	193	146
Total	23,802	37,582
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	227,046	213,336
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	92,312	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	399,277	419,958
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	161,590	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	26,160	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	15,653	43,394
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	36,592	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	16,369	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	434	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	335,425	276,531
Total	335,425	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	227,046	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	92,010	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	16,369	13,954
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	640,008	731,798
Derivative assets		109
Total	640,008	731,907
Derivative liabilities	193	146
Total	193	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	302	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	399,277	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	161,590	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	26,160	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	15,653	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	36,592	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	434	424
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	23,609	37,436
Total	$ 23,609	$ 37,436

Schedule of Reported Financial

Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 975,433	$ 1,008,438
Liabilities	23,802	37,582
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	193	146
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	319,358	264,705
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	410,003	477,696
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	246,072	265,928
Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets		109
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	500	15,500
Long Term Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	23,109	21,936
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	335,425	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	319,056	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	16,369	13,954
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	640,008	731,907
Liabilities	193	146
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	193	146
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	302	2,128
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	410,003	477,696
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	229,703	251,974
Significant Other Observable Inputs (Level 2) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets		109
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	23,609	37,436
Significant Unobservable Inputs (Level 3) | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	500	15,500
Significant Unobservable Inputs (Level 3) | Long Term Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	$ 23,109	$ 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
		Apr. 03, 2016	Apr. 05, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		$ 37,436	$ 3,350
Payments	[1]	(15,000)	0
Fair value adjustment	[2]	1,173	0
Ending Balance		$ 23,609	$ 3,350
[1]	In the three months ended April 3, 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 three months ended April 3, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $1.2 million primarily due to a lower discount rate.

Schedule of Changes in Fair V48

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) $ in Thousands	3 Months Ended
	Apr. 03, 2016USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration	$ 11,697
Increase in contingent consideration	1,173
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%
Increase in contingent consideration	$ 1,200

Quantitative Information Associ

Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 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	15.40%
Discount Rate	4.70%
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	15.40%
Discount Rate	4.70%
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	$ 6,760
Monte Carlo simulation model | Significant Unobservable Inputs (Level 3) | Universal Robots
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	$ 16,349
Income Approach Valuation Technique | Revenue for calendar year 2016 | Avionics Interface Technologies, LLC
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Target achievement, probability	48.00%
Discount Rate	4.70%
Income Approach Valuation Technique | Significant Unobservable Inputs (Level 3) | Avionics Interface Technologies, LLC
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration	$ 500

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities	$ 656,075	$ 743,624
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	319,358	264,705
Marketable securities	656,075	743,624
Derivative assets		109
Contingent consideration	23,609	37,436
Derivative liabilities	193	146
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	319,358	264,705
Marketable securities	656,075	743,624
Derivative assets		109
Contingent consideration	23,609	37,436
Derivative liabilities	$ 193	$ 146

Schedule of Available for Sale

Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 653,702	$ 745,498
Available-for-sale marketable securities, Unrealized Gain	3,897	2,145
Available-for-sale marketable securities, Unrealized (Loss)	(1,524)	(4,019)
Available-for-sale marketable securities, Fair Market Value	656,075	743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	294,269	601,660
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	398,832	421,060
Available-for-sale marketable securities, Unrealized Gain	620	65
Available-for-sale marketable securities, Unrealized (Loss)	(175)	(1,167)
Available-for-sale marketable securities, Fair Market Value	399,277	419,958
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	204,136	379,434
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	161,005	163,297
Available-for-sale marketable securities, Unrealized Gain	1,861	902
Available-for-sale marketable securities, Unrealized (Loss)	(1,276)	(2,565)
Available-for-sale marketable securities, Fair Market Value	161,590	161,634
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	73,165	145,373
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	26,107	84,032
Available-for-sale marketable securities, Unrealized Gain	57	42
Available-for-sale marketable securities, Unrealized (Loss)	(4)	(122)
Available-for-sale marketable securities, Fair Market Value	26,160	83,952
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	9,747	55,120
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	15,651	43,391
Available-for-sale marketable securities, Unrealized Gain	2	6
Available-for-sale marketable securities, Unrealized (Loss)		(3)
Available-for-sale marketable securities, Fair Market Value	15,653	43,394
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		10,527
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	36,563	20,298
Available-for-sale marketable securities, Unrealized Gain	29	11
Available-for-sale marketable securities, Unrealized (Loss)		(1)
Available-for-sale marketable securities, Fair Market Value	36,592	20,308
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	6,475	8,646
Equity And Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	15,110	12,996
Available-for-sale marketable securities, Unrealized Gain	1,328	1,119
Available-for-sale marketable securities, Unrealized (Loss)	(69)	(161)
Available-for-sale marketable securities, Fair Market Value	16,369	13,954
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	746	2,560
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	434	424
Available-for-sale marketable securities, Fair Market Value	$ 434	$ 424

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 653,702	$ 745,498
Available-for-sale marketable securities, Unrealized Gain	3,897	2,145
Available-for-sale marketable securities, Unrealized (Loss)	(1,524)	(4,019)
Available-for-sale marketable securities, Fair Market Value	656,075	743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	294,269	601,660
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	409,971	478,306
Available-for-sale marketable securities, Unrealized Gain	146	38
Available-for-sale marketable securities, Unrealized (Loss)	(114)	(648)
Available-for-sale marketable securities, Fair Market Value	410,003	477,696
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	204,024	374,785
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	243,731	267,192
Available-for-sale marketable securities, Unrealized Gain	3,751	2,107
Available-for-sale marketable securities, Unrealized (Loss)	(1,410)	(3,371)
Available-for-sale marketable securities, Fair Market Value	246,072	265,928
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 90,245	$ 226,875

Contractual Maturities of Inves

Contractual Maturities of Investments Held (Detail) $ in Thousands	Apr. 03, 2016USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 409,971
Due after 1 year through 5 years, cost	184,645
Due after 5 years through 10 years, cost	4,432
Due after 10 years, cost	39,544
Total, cost	638,592
Due within one year, fair value	410,003
Due after 1 year through 5 years, fair value	184,852
Due after 5 years through 10 years, fair value	4,546
Due after 10 years, fair value	40,305
Total, fair value	$ 639,706

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ (193)	$ (37)
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Prepayments
Derivatives, Fair Value [Line Items]
Derivative assets		109
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (193)	$ (146)

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts derivatives not designated as hedging instruments, Gains (Losses) Recognized in Statement of Operations	$ 3,298	$ 3,425
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	$ 3,298	$ 3,425

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Apr. 27, 2015	Apr. 03, 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	Apr. 03, 2016	Dec. 31, 2015
Prepaid And Other Current Assets [Line Items]
Contract manufacturer prepayments	$ 68,746	$ 66,283
Prepaid maintenance and other services	7,061	8,481
Prepaid taxes	5,281	3,781
Other prepayments	14,097	12,974
Total prepayments	$ 95,185	$ 91,519

Deferred Revenue and Customer58

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015	Apr. 05, 2015	Dec. 31, 2014
Deferred Revenue Arrangement
Extended warranty	$ 46,115	$ 46,499	$ 40,704	$ 43,300
Product maintenance and training	31,368	30,616
Customer advances	5,347	17,456
Undelivered elements and other	14,733	16,701
Total deferred revenue and customer advances	$ 97,563	$ 111,272

Warranty Accrual Included in Ot

Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 6,925	$ 8,942
Accruals for warranties issued during the period	3,490	2,361
Adjustments related to pre-existing warranties	243	(1,031)
Settlements made during the period	(3,162)	(2,849)
Balance at end of period	$ 7,496	$ 7,423

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
	Apr. 03, 2016	Apr. 05, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 46,499	$ 43,300
Deferral of new extended warranty revenue	6,827	4,204
Recognition of extended warranty deferred revenue	(7,211)	(6,800)
Balance at end of period	$ 46,115	$ 40,704

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - $ / shares shares in Millions	1 Months Ended		3 Months Ended
	Jan. 31, 2016	Jan. 31, 2014	Apr. 03, 2016	Apr. 05, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Number of service-based stock options granted to executive officers			0.1
Weighted average grant date fair value of stock options granted to executive officers			$ 5.30
Stock options term			7 years
Service-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted			1.2
Weighted average grant date fair value of restricted stock units granted			$ 18.47
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted				1.4
Weighted average grant date fair value of restricted stock units granted				$ 17.14
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
Weighted average grant date fair value of stock options granted to executive officers				$ 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
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	3 Months Ended
	Apr. 03, 2016	Apr. 05, 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 Va63

Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Stock Options	3 Months Ended
	Apr. 03, 2016	Apr. 05, 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 Balances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (8,144)	$ 4,689
Other comprehensive income (loss) before reclassifications, net of tax	13,342	1,799
Amounts reclassified from accumulated other comprehensive income, net of tax	(163)	(404)
Other comprehensive income	13,179	1,395
Ending balance	5,035	6,084
Foreign currency translation reclassification adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(8,759)
Other comprehensive income (loss) before reclassifications, net of tax	10,271
Other comprehensive income	10,271
Ending balance	1,512
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	3,071	1,799
Amounts reclassified from accumulated other comprehensive income, net of tax	(83)	(330)
Other comprehensive income	2,988	1,469
Ending balance	1,574	3,834
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, net of tax	(80)	(74)
Other comprehensive income	(80)	(74)
Ending balance	$ 1,949	$ 2,250

Changes in Accumulated Other 65

Changes in Accumulated Other Comprehensive Income Balances (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income before reclassifications, tax	$ 0
Other comprehensive income (loss) before reclassifications, net of tax	1,253	$ 704
Amounts reclassified from accumulated other comprehensive income, tax	11	(169)
Amounts reclassified from accumulated other comprehensive income, tax	(46)	(42)
Foreign currency translation adjustments, tax	0		$ 0
Unrealized gains on marketable securities, tax	805	2,133	(459)	$ 1,598
Retirement plans prior service benefit, tax	(668)	(495)	$ (622)	$ (453)
Foreign currency translation reclassification adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), tax	0
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), tax	1,264
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), tax	$ (46)	$ (169)

Reclassification Out of Accumul

Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2016	Apr. 05, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains, net of tax		$ 83	$ 330
Prior service benefit	[1]	80	74
Total reclassifications		163	404
Interest Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains, net of tax		$ 83	$ 330
[1]	The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note O: "Retirement Plans."

Reclassification Out of Accum67

Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains, tax	$ 11	$ (169)
Prior service benefit, tax	(46)	(42)
Total reclassifications, tax	$ 35	$ 211

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Dec. 31, 2015
Goodwill [Line Items]
Foreign currency translation adjustment	$ 7,458
Goodwill	1,003,491	$ 996,033
Accumulated impairment losses	(507,620)	(507,620)
Goodwill	495,871	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	7,458
Goodwill	222,433	214,975
Goodwill	222,433	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	361,819	361,819
Accumulated impairment losses	(98,897)	(98,897)
Goodwill	$ 262,922	$ 262,922

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 03, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 498,264	$ 543,004
Accumulated Amortization	274,990	303,173
Net Carrying Amount	$ 223,274	$ 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	$ 333,947	$ 379,778
Accumulated Amortization	186,118	220,306
Net Carrying Amount	$ 147,829	$ 159,472
Weighted Average Useful Life, years	6 years	6 years
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 110,658	$ 110,340
Accumulated Amortization	68,114	63,718
Net Carrying Amount	$ 42,544	$ 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	$ 53,169	$ 52,396
Accumulated Amortization	20,468	18,879
Net Carrying Amount	$ 32,701	$ 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	$ 320
Accumulated Amortization	120	100
Net Carrying Amount	$ 200	$ 220
Weighted Average Useful Life, years	4 years	4 years
Customer backlog
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 170	$ 170
Accumulated Amortization	$ 170	$ 170
Weighted Average Useful Life, years	3 months 18 days	3 months 18 days

Goodwill and Intangible Asset70

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired intangible asset amortization	$ 19,994	$ 13,808

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Apr. 03, 2016USD ($)
Finite-Lived Intangible Assets
2016 (remainder)	$ 60,547
2,017	71,899
2,018	45,160
2,019	24,260
2,020	10,304
Thereafter	$ 11,104

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
	Apr. 03, 2016	Apr. 05, 2015
Net Income Loss Per Common Share
Net income for basic and diluted net income per share	$ 49,986	$ 32,787
Weighted average common shares-basic	204,271	217,187
Employee stock purchase plan	9	28
Dilutive potential common shares	1,461	1,625
Weighted average common shares-diluted	205,732	218,812
Net income per common share-basic	$ 0.24	$ 0.15
Net income per common share-diluted	$ 0.24	$ 0.15
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements	965	901
Stock Options
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements	487	696

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Net Income Loss Per Common Share
Exercise of stock options	0.3	0.2

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) $ in Thousands	3 Months Ended
	Apr. 03, 2016USD ($)Employee
Restructuring Cost and Reserve
Contingent consideration adjustment	$ 1,173
System Test and Semiconductor Test
Restructuring Cost and Reserve
Severance benefit and charges	$ 400
Reduction in employees headcount | Employee	12
Universal Robots
Restructuring Cost and Reserve
Contingent consideration adjustment	$ 1,200

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Apr. 03, 2016USD ($)
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	$ 0.7
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	$ 0.6

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement Benefit (Income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Defined Benefit Plan Disclosure
Net actuarial gain	$ (1,193)
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	576	$ 616
Interest cost	3,414	3,282
Expected return on plan assets	(3,443)	(3,624)
Amortization of prior service benefit	24	33
Net actuarial gain	(1,193)
Total net periodic	(622)	307
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	207	247
Interest cost	206	358
Expected return on plan assets	(5)	(195)
Settlement	(239)
Total net periodic	169	410
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	10	12
Interest cost	56	59
Amortization of prior service benefit	(150)	(149)
Total net periodic	$ (84)	$ (78)

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Apr. 03, 2016USD ($)
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments	$ 235.3
Purchase commitments less than one year	$ 233.7

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015	Dec. 31, 2015
Income Taxes [Line Items]
Effective tax rate	12.60%	22.70%
U.S. statutory federal tax rate	35.00%
Other discrete tax benefits	$ 0.4
Discrete tax benefit related to decrease in uncertain tax positions	2.5	$ (1.2)
Gains on non-taxable foreign exchange	1.2
Marketable securities	0.9
Discrete tax benefit related to disqualifying dispositions of incentive stock options and employee stock purchase plan shares		0.5
Uncertain tax positions	35.2		$ 33.7
Net Increase in uncertain tax positions	1.5
Decrease in unrecognized tax benefits	(9.1)
Accrued interest and penalties	0.8		$ 0.5
Interest and penalties related to income tax	0.3
Tax savings due to the tax holiday	$ 2.6	$ 1.1
Tax savings due to the tax holiday, per share	$ 0.01
Tax holiday expiration date	December 31, 2020

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended
	Apr. 03, 2016Segment
Segment Reporting Information [Line Items]
Operating segments	4

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2016		Apr. 05, 2015		Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues		$ 430,994		$ 342,401
Income (loss) before income taxes	[1],[2]	57,192		42,438
Total assets		2,548,974	[3]	2,512,182	[3]	$ 2,548,674
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		340,264		270,917
Income (loss) before income taxes	[1],[2]	73,254		43,125
Total assets	[3]	664,555		596,477
Wireless Test
Segment Reporting Information [Line Items]
Revenues		20,314		34,048
Income (loss) before income taxes	[1],[2]	(20,140)		(10,441)
Total assets	[3]	408,466		465,465
System Test
Segment Reporting Information [Line Items]
Revenues		53,670		37,436
Income (loss) before income taxes	[1],[2]	9,492		1,005
Total assets	[3]	90,695		94,133
Corporate And Eliminations
Segment Reporting Information [Line Items]
Income (loss) before income taxes	[1],[2]	1,754		8,749
Total assets	[3]	1,034,669		$ 1,356,107
Industrial Automation
Segment Reporting Information [Line Items]
Revenues		16,746
Income (loss) before income taxes	[1],[2]	(7,168)
Total assets	[3]	$ 350,589
[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
	Apr. 03, 2016	Apr. 05, 2015
Segment Reporting Information [Line Items]
Restructuring and other	$ 1,587
Contingent consideration adjustment	1,173
Gain from the sale of an equity investment		$ (4,782)
Universal Robots
Segment Reporting Information [Line Items]
Contingent consideration adjustment	1,200
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	3,685	531
Restructuring and other	414
Total	4,099	531
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	605	846
Total	605	846
Corporate And Eliminations
Segment Reporting Information [Line Items]
Total	1,173	(4,782)
Corporate And Eliminations | Other (income) expense, net
Segment Reporting Information [Line Items]
Gain from the sale of an equity investment		$ (4,782)
Corporate And Eliminations | Universal Robots | Restructuring and other
Segment Reporting Information [Line Items]
Contingent consideration adjustment	$ 1,173

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended		12 Months Ended		15 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Apr. 03, 2016	Apr. 05, 2015	Dec. 31, 2016	Dec. 31, 2015	Apr. 03, 2016
Stockholders Equity Note Disclosure [Line Items]
Repurchase of stock, value			$ 28,000,000			$ 300,000,000
Repurchase of stock, shares			1.5
Cumulative repurchases, shares			17.1				17.1
Cumulative repurchases, value			$ 328,000,000				$ 328,000,000
Common stock average price			$ 18.81				$ 19.17
Dividends payable, amount per share	$ 0.06	$ 0.06
Dividends payable, date to be paid	Mar. 21, 2016	Mar. 24, 2015
Dividends payable, record date	Feb. 26, 2016	Feb. 27, 2015
Dividend payment			$ 12,253,000	$ 13,049,000
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

Subsequent Events - Additional

Subsequent Events - Additional information (Detail) - Subsequent Event - Earthquake	Apr. 16, 2016USD ($)
Subsequent Event [Line Items]
Net book value of inventory and fixed assets	$ 17,000,000
Earthquake insurance	10,000,000
Insurance deductible	$ 2,500,000