Teradyne (TER) 10-K 23 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 16, 2022	Jul. 02, 2021
Cover [Abstract]
Amendment Flag	false
Document Type	10-K
Document Fiscal Year Focus	2021
Entity Central Index Key	0000097210
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Document Period End Date	Dec. 31, 2021
Entity Registrant Name	TERADYNE, INC.
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 16.9
Trading Symbol	TER
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity File Number	001-06462
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2272148
Entity Address, Address Line One	600 RIVERPARK DRIVE
Entity Address, City or Town	NORTH READING
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01864
City Area Code	978
Local Phone Number	370-2700
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		162,417,046
ICFR Auditor Attestation Flag	true
Auditor Name	PricewaterhouseCoopers LLP
Auditor Firm ID	238
Auditor Location	Boston, Massachusetts

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 1,122,199	$ 914,121
Marketable securities		244,231	522,280
Accounts receivable, less allowance for credit losses of $2,012 and $2,034 in 2021 and 2020, respectively		550,749	497,506
Inventories, net		243,330	222,189
Prepayments		406,266	250,092
Other current assets		9,452	9,246
Total current assets		2,576,227	2,415,434
Property, plant and equipment, net		387,240	394,800
Operating lease right-of-use assets, net		68,807	54,569
Marketable securities		133,858	117,980
Deferred tax assets		102,428	87,913
Retirement plans assets		15,110	17,468
Other assets		24,096	9,384
Acquired intangible assets, net		75,635	100,939
Goodwill		426,024	453,859
Total assets	[1]	3,809,425	3,652,346
Current liabilities:
Accounts payable		153,133	133,663
Accrued employees' compensation and withholdings		253,667	220,321
Deferred revenue and customer advances		146,185	134,662
Other accrued liabilities		124,187	77,581
Operating lease liabilities		19,977	20,573
Income taxes payable		88,789	80,728
Current debt		19,182	33,343
Total current liabilities		805,120	700,871
Retirement plans liabilities		151,141	151,140
Long-term deferred revenue and customer advances		54,921	58,359
Long-term contingent consideration		0	7,227
Deferred tax liabilities		6,327	10,821
Long-term other accrued liabilities		15,497	19,352
Long-term operating lease liabilities		56,178	42,073
Long-term incomes taxes payable		67,041	74,930
Debt		89,244	376,768
Total liabilities		1,245,469	1,441,541
Commitments and contingencies
Mezzanine equity:
Convertible common shares		1,512	3,787
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 162,251 and 166,123 shares issued and outstanding at December 31, 2021 and 2020, respectively		20,281	20,765
Additional paid-in capital		1,811,545	1,765,323
Accumulated other comprehensive income (loss)		(5,948)	33,516
Retained earnings (accumulated deficit)		736,566	387,414
Total shareholders' equity		2,562,444	2,207,018
Total liabilities, convertible common shares and shareholders' equity		$ 3,809,425	$ 3,652,346
[1]	Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable, less allowance for doubtful accounts	$ 2,012	$ 2,034
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	162,251	166,123
Common stock, shares outstanding	162,251	166,123

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	[1],[2]	$ 3,702,881	$ 3,121,469	$ 2,294,965
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		1,496,225	1,335,728	955,136
Gross profit		2,206,656	1,785,741	1,339,829
Operating expenses:
Selling and administrative		547,559	464,769	437,084
Engineering and development		427,609	374,964	322,824
Acquired intangible assets amortization		21,456	30,803	40,147
Restructuring and other		9,312	(13,202)	(13,880)
Total operating expenses		1,005,936	857,334	786,175
Income from operations		1,200,720	928,407	553,654
Non-operating (income) expenses:
Interest income		(2,627)	(5,982)	(16,990)
Interest expense		17,820	24,182	22,224
Other (income) expense, net		24,572	9,192	22,648
Income before income taxes	[3],[4]	1,160,955	901,015	525,772
Income tax provision		146,366	116,868	58,304
Net income		$ 1,014,589	$ 784,147	$ 467,468
Net income per common share:
Basic		$ 6.15	$ 4.72	$ 2.74
Diluted		$ 5.53	$ 4.28	$ 2.60
Weighted average common shares—basic		164,960	166,120	170,425
Weighted average common shares—diluted		183,625	183,042	179,459
Product [Member]
Revenues:
Total revenues		$ 3,196,575	$ 2,690,906	$ 1,887,674
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		1,300,106	1,157,476	782,047
Service [Member]
Revenues:
Total revenues		506,306	430,563	407,291
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 196,119	$ 178,252	$ 173,089
[1]	Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2]	Revenues attributable to a country are based on location of customer site.
[3]	Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation.
[4]	Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 1,014,589	$ 784,147	$ 467,468
Other comprehensive income, net of tax:
Foreign currency translation adjustment, net of tax of $0, respectively	(36,207)	48,903	(10,991)
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(578), $1,629, $1,659, respectively	(2,255)	5,839	6,015
Less: Reclassification adjustment for gains included in net income, net of tax of $(277), $(665), $(192), respectively	(995)	(2,365)	(690)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(3,250)	3,474	5,325
Defined benefit pension and post-retirement plans:
Amortization of prior service credit, net of tax $(2), $(2), $(43), respectively	(7)	(7)	(148)
Other comprehensive income (loss)	(39,464)	52,370	(5,814)
Comprehensive income	$ 975,125	$ 836,517	$ 461,654

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Foreign currency translation adjustments, tax			$ 0
Unrealized gains (losses) on marketable securities arising during period, net of tax	$ (578)	$ 1,629	1,659
Reclassification adjustment for (gains) losses included in net income, net of tax	(277)	(665)	(192)
Amortization of prior service credit, net of tax	$ (2)	$ (2)	$ (43)

CONSOLIDATED STATEMENTS OF CONV

CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Common StockConvertible Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings (Accumulated Deficit)
Balance at Dec. 31, 2018	$ 1,522,354	$ 21,940		$ 1,671,645	$ (13,040)	$ (158,191)
Balance, Shares at Dec. 31, 2018		175,522,000
Net issuance of common stock under stock-based plans	10,622	$ 223		10,399
Net issuance of common stock under stock-based plans (in shares)		1,784,000
Stock-based compensation expense	38,085			38,085
Repurchase of common stock	(491,202)	$ (1,362)				(489,840)
Repurchase of common stock (in shares)		(10,896,000)
Cash dividends	(61,355)					(61,355)
Net income	467,468					467,468
Other comprehensive income/loss	(5,814)				(5,814)
Balance at Dec. 31, 2019	1,480,158	$ 20,801		1,720,129	(18,854)	(241,918)
Balance, Shares at Dec. 31, 2019		166,410,000
Net issuance of common stock under stock-based plans	4,850	$ 154		4,696
Net issuance of common stock under stock-based plans (in shares)		1,230,000
Stock-based compensation expense	44,285			44,285
Repurchase of common stock	(88,465)	$ (190)				(88,275)
Repurchase of common stock (in shares)		(1,517,000)
Cash dividends	(66,540)					(66,540)
Convertible common shares	(3,787)		$ 3,787	(3,787)
Net income	784,147					784,147
Other comprehensive income/loss	52,370				52,370
Balance at Dec. 31, 2020	2,207,018	$ 20,765	3,787	1,765,323	33,516	387,414
Balance, Shares at Dec. 31, 2020		166,123,000
Net issuance of common stock under stock-based plans		$ 113		(225)	(112)
Net issuance of common stock under stock-based plans (in shares)		899,000
Stock-based compensation expense	45,632			45,632
Repurchase of common stock	(600,000)	$ (597)				(599,403)
Repurchase of common stock (in shares)		(4,771,000)
Cash dividends	(66,034)					(66,034)
Convertible common shares	2,275		$ (2,275)	2,275
Settlements of convertible notes	985,640	$ 1,018		984,622
Settlement of convertible notes (in shares)		8,148
Exercise of convertible notes hedge call options	(987,100)	$ (1,018)		(986,082)
Exercise of convertible notes hedge call options (in shares)		(8,148)
Net income	1,014,589					1,014,589
Other comprehensive income/loss	(39,464)				(39,464)
Balance at Dec. 31, 2021	$ 2,562,444	$ 20,281		$ 1,811,545	$ (5,948)	$ 736,566
Balance, Shares at Dec. 31, 2021		162,251,000	1,512,000

CONSOLIDATED STATEMENTS OF CO_3

CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Dividends, Per Share, Cash Paid	$ 0.40	$ 0.40	$ 0.36

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 1,014,589	$ 784,147	$ 467,468
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	91,073	80,119	70,834
Amortization	34,412	46,624	49,821
Stock-based compensation	45,643	44,906	37,897
Provision for excess and obsolete inventory	15,475	17,534	15,244
Retirement plans actuarial losses (gains)	(2,217)	10,284	8,176
Contingent consideration adjustment	(7,227)	(23,271)	(19,257)
Deferred taxes	(17,305)	(15,688)	(9,456)
(Gains) losses on investments	(6,410)	(7,898)	(6,033)
Investment impairment	0	0	15,000
Other	271	1,557	766
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	(57,778)	(129,451)	(70,440)
Inventories	6,495	(8,438)	(27,408)
Prepayments and other assets	(175,846)	(64,418)	(23,784)
Accounts payable and other accrued expenses	129,499	73,167	49,279
Deferred revenue and customer advances	9,873	39,974	39,313
Retirement plans contributions	(5,405)	(5,382)	(5,086)
Income taxes	(5,604)	25,169	(13,584)
Loss on convertible debt conversion	28,828	0	0
Net cash provided by operating activities	1,098,366	868,935	578,750
Cash flows from investing activities:
Purchases of property, plant and equipment	(132,472)	(184,977)	(134,642)
Purchases of marketable securities	(661,781)	(900,196)	(662,701)
Proceeds from maturities of marketable securities	660,148	479,678	611,927
Proceeds from sales of marketable securities	266,466	35,006	105,586
Proceeds from life insurance	0	546	2,912
Purchase of investment and acquisition of businesses, net of cash acquired	(12,000)	149	(79,742)
Net cash (used for) provided by investing activities	120,361	(569,794)	(156,660)
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	32,686	28,527	29,312
Repurchase of common stock	(600,000)	(88,465)	(500,000)
Dividend payments	(65,977)	(66,482)	(61,305)
Payments related to net settlement of employee stock compensation awards	(32,303)	(23,014)	(14,741)
Payments of contingent consideration	0	(8,852)	(27,615)
Payments of convertible debt principal	(342,990)	0	0
Net cash (used for) provided by financing activities	(1,008,584)	(158,286)	(574,349)
Effects of exchange rate changes on cash and cash equivalents	(2,065)	(658)	(569)
Increase (decrease) in cash and cash equivalents	208,078	140,197	(152,828)
Cash and cash equivalents at beginning of year	914,121	773,924	926,752
Cash and cash equivalents at end of year	1,122,199	914,121	773,924
Cash paid for:
Interest	4,236	6,435	5,996
Income taxes	172,134	106,577	81,410
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 1,973	$ 3,666	$ 4,068

The Company

The Company	12 Months Ended
	Dec. 31, 2021
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 many industries including consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s industrial automation products include collaborative robotic arms, autonomous mobile robots, and advanced robotic control software used by global manufacturing, logistics and light industrial customers to improve quality, increase manufacturing and material handling efficiency and decrease manufacturing and logistics costs. Teradyne’s automatic test equipment and industrial automation products and services include: • semiconductor test (“Semiconductor Test”) systems; • storage and system level test (“Storage Test”) systems, defense/aerospace (“Defense/Aerospace”) test instrumentation and 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. On January 30, 2019, Teradyne acquired all of the issued and outstanding shares of Lemsys SA (“Lemsys”) for a total purchase price of approximately $9.1 million. Lemsys strengthens Teradyne’s position in the electrification of vehicles, solar and wind power, and industrial applications. Lemsys is included in Teradyne’s Semiconductor Test segment. On June 3, 2019, Teradyne invested $15.0 million in RealWear, Inc. (“RealWear”). RealWear, a private company, develops and sells advanced wearable technology including industrial, hands-free, head-mounted augmented reality devices that make the workplace safer and more productive. On February 28, 2020, RealWear’s debt holder demanded repayment of its $25.0 million loan to RealWear. As a result, in the fourth quarter of 2019, Teradyne recorded an impairment charge of $15.0 million to reduce its investment in RealWear to zero as of December 31, 2019. On November 13, 2019, Teradyne acquired 100% of the membership interests of AutoGuide, LLC (“AutoGuide”), a maker of high payload AMRs, an emerging and fast-growing segment of the global forklift market. The total purchase price was approximately $81.6 million, which included cash paid of approximately $57.6 million and $24.0 million in fair value of contingent consideration payable upon achievement of certain performance targets, extending potentially through 2022. At December 31, 2021, the maximum contingent consideration that could be paid is $87.7 million. AutoGuide’s AMRs are used for material transport of payloads up to 4,500 kg in manufacturing, warehouse and logistics applications. These products complement MiR’s lower payload products. AutoGuide is included in our Industrial Automation segment. On June 1, 2021, Teradyne invested $12.0 million in MachineMetrics, Inc. (“MachineMetrics”), a private company that develops and sells products to improve manufacturing performance through automated machine data collection, alerting, and analytics. Teradyne’s investment in MachineMetrics aligns with its strategy of providing and investing in leading edge products for automating industrial production processes in growing markets. The investment was recorded at cost and is evaluated for impairment or an indication of changes in fair value resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer on a quarterly basis. At December 31, 2021, the value of the investment was $12.0 million, and there was no change during the year ended December 31, 2021.

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies	B. ACCOUNTING POLICIES The consolidated financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions are eliminated. Certain prior years’ amounts were reclassified to conform to the current year presentation. Preparation of Financial Statements and Use of Estimates The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, management evaluates its estimates, including those related to inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, contingent consideration liabilities, and loss contingencies. Management bases its estimates on historical experience and on appropriate and customary assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Due to the COVID-19 pandemic, there has been uncertainty and disruption in the global economy and our markets. Management is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of this Annual Report on Form 10-K. These estimates may change, as new events occur and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions. Revenue Recognition Revenue from Contracts with Customers In accordance with ASC 606, Teradyne recognizes revenues, when or as control is transferred to a customer. Teradyne’s determination of revenue is dependent upon a five-step process outlined below. • Teradyne accounts for a contract with a customer when there is written approval, the contract is committed, the rights of the parties, including payment terms, are identified, the contract has commercial substance and consideration is probable of collection. • Teradyne periodically enters into contracts with customers in which a customer may purchase a combination of goods and services, such as products with extended warranty obligations. Teradyne determines performance obligations by assessing whether the products or services are distinct from the other elements of the contract. In order to be distinct, the product or service must perform either on its own or with readily available resources and must be separate within the context of the contract. • Teradyne determines the transaction price to be the amount of consideration to which Teradyne expects to be entitled to. • Transaction price is allocated to each individual performance obligation based on the standalone selling price of that performance obligation. Teradyne uses standalone transactions when available to value each performance obligation. If standalone transactions are not available, Teradyne will estimate the standalone selling price through market assessments or cost plus a reasonable margin analysis. Any discounts from standalone selling price are spread proportionally to each performance obligation. • In order to determine the appropriate timing for revenue recognition, Teradyne first determines if the transaction meets any of three criteria for over time recognition. If the transaction meets the criteria for over time recognition, Teradyne recognizes revenue as the good or service is delivered. Teradyne uses input variables such as hours or months utilized or costs incurred to determine the amount of revenue to recognize in a given period. Input variables are used as they best align consumption with benefit to the customer. For transactions that do not meet the criteria for over time recognition, Teradyne will recognize revenue at a point in time based on an assessment of the five criteria for transfer of control. Teradyne has concluded that revenue should be recognized when shipped or delivered based on contractual terms. Typically, acceptance of Teradyne’s products and services is a formality as Teradyne delivers similar systems, instruments and robots to standard specifications. In cases where acceptance is not deemed a formality, Teradyne will defer revenue recognition until customer acceptance. Performance Obligations Products Teradyne products consist primarily of semiconductor test systems and instruments, defense/aerospace test instrumentation and systems, storage test systems and instruments, circuit-board test and inspection systems and instruments, wireless test systems and industrial automation products. Teradyne’s hardware is recognized at a point in time upon transfer of control to the customer. Services Teradyne services consist of extended warranties, training and application support, service agreements, post contract customer support (“PCS”) and replacement parts. Each service is recognized based on relative standalone selling price. Extended warranty, training and support, service agreements and PCS are recognized over time based on the period of service. Replacement parts are recognized at a point in time upon transfer of control to the customer. Teradyne does not allow customer returns or provide refunds to customers for any products or services. Teradyne products include a standard 12-month warranty. This warranty is not considered a distinct performance obligation because it does not obligate Teradyne to provide a separate service to the customer and it cannot be purchased separately. Cost related to warranties As of December 31, 2021 and 2020, deferred revenue and customer advances consisted of the following and are included in the short and long-term deferred revenue and customer advances: 2021 2020 (in thousands) Maintenance, service and training $ 81,826 $ 77,654 Extended warranty 64,168 51,929 Customer advances, undelivered elements and other 55,112 63,438 Total deferred revenue and customer advances $ 201,106 $ 193,021 Product Warranty Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities: Amount (in thousands) Balance at December 31, 2018 $ 7,909 Acquisition 14 Accruals for warranties issued during the period 14,106 Accruals related to pre-existing warranties 4,026 Settlements made during the period (17,059 ) Balance at December 31, 2019 8,996 Accruals for warranties issued during the period 28,490 Accruals related to pre-existing warranties 821 Settlements made during the period (21,674 ) Balance at December 31, 2020 16,633 Accruals for warranties issued during the period 35,727 Accruals related to pre-existing warranties (6,846 ) Settlements made during the period (20,937 ) Balance at December 31, 2021 $ 24,577 When Teradyne receives revenue for extended warranties, beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances: Amount (in thousands) Balance at December 31, 2018 $ 27,422 Deferral of new extended warranty revenue 23,271 Recognition of extended warranty deferred revenue (20,016 ) Balance at December 31, 2019 30,677 Deferral of new extended warranty revenue 41,694 Recognition of extended warranty deferred revenue (20,442 ) Balance at December 31, 2020 51,929 Deferral of new extended warranty revenue 43,597 Recognition of extended warranty deferred revenue (31,358 ) Balance at December 31, 2021 $ 64,168 Accounts Receivable and Allowance for Doubtful Accounts Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Teradyne maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. Estimated allowances for doubtful accounts are reviewed periodically taking into account the customer’s recent payment history, the customer’s current financial statements and other information regarding the customer’s credit worthiness. Account balances are written off against the allowance when it is determined the receivable will not be recovered. Teradyne sells certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. Teradyne accounts for these transactions as sales of receivables and presents cash proceeds as a cash provided by operating activities in the consolidated statements of cash flows. Total trade accounts receivable sold under the factoring agreements were $111.3 million and $131.1 million during 2021 and 2020, respectively. Factoring fees for the sales of receivables are recorded in interest expense and are not material. Inventories Inventories are stated at the lower of cost (first-in, first-out basis) or net realizable value. On a quarterly basis, Teradyne uses consistent methodologies to evaluate all inventories for net realizable value. Teradyne records a provision for both excess and obsolete inventory when such write-downs or write-offs are identified through the quarterly review process. The inventory valuation is based upon assumptions about future demand, product mix and possible alternative uses. Investments Teradyne accounts for its investments in debt and equity securities in accordance with the provisions of ASC 320-10, “ Investments—Debt and Equity Securities • 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 twelve months ended December 31, 2021 and 2020. Teradyne measures its debt and equity investments at fair value, in accordance with 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 debt investments are classified as Level 2, and equity investments are classified as Level 1. Acquisition-related contingent consideration is classified as Level 3. Teradyne determines the fair value of acquisition-related contingent consideration using a Monte Carlo simulation model. Assumptions utilized in the model include forecasted revenues, revenue volatility, earnings before interest and taxes, and discount rate. Financial Assets and Financial Liabilities Teradyne records changes in fair value of equity securities directly in earnings and realized gains and losses in other (income) expense, net, in accordance with ASU 2016-01, “ Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities Prepayments Prepayments consist of the following: 2021 2020 (in thousands) Contract manufacturer and supplier prepayments $ 364,478 $ 212,286 Prepaid taxes 15,090 9,361 Prepaid maintenance and other services 13,660 13,116 Other prepayments 13,038 15,329 Total prepayments $ 406,266 $ 250,092 Retirement and Postretirement Plans Teradyne recognizes net actuarial gains and losses and the change in the fair value of the plan assets in its operating results in the year in which they occur or upon any interim remeasurement of the plans. Teradyne calculates the expected return on plan assets using the fair value of the plan assets. Actuarial gains and losses are generally measured annually as of December 31 and, accordingly, recorded during the fourth quarter of each year or upon any interim remeasurement of the plans. Teradyne reports net periodic pension cost and net periodic postretirement benefit costs in accordance with ASU 2017-07, “ Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost Goodwill, Intangible and Long-Lived Assets Teradyne accounts for goodwill and intangible assets in accordance with ASC 350-10, “ Intangibles-Goodwill and Other. In accordance with ASC 350-10, Teradyne has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If Teradyne determines this is the case, Teradyne is required to perform a quantitative goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. If Teradyne determines that it is more likely than not that the fair value of the reporting unit is greater than its carrying amounts, a quantitative goodwill impairment test is not required. In accordance with ASC 360-10, “ Impairment or Disposal of Long-Lived Assets, recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flows analysis. The cash flows estimates used to determine the impairment, if any, contain management’s best estimates using appropriate assumptions and projections at that time. Business Combination Teradyne recognizes the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. The fair value of identifiable intangible assets is based on detailed cash flows valuations that use information and assumptions provided by management. Teradyne estimates the fair value of contingent consideration at the time of the acquisition using all pertinent information known to us at the time to assess the probability of payment of contingent amounts or through the use of a Monte Carlo simulation model. Teradyne allocates any excess purchase price over the fair value of the net tangible and intangible assets acquired and liabilities assumed to goodwill. The assumptions used in the valuations for our acquisitions may differ materially from actual results depending on performance of the acquired businesses and other factors. While Teradyne believes the assumptions used were appropriate, different assumptions in the valuation of assets acquired and liabilities assumed could have a material impact on the timing and extent of impact on our statements of operations. Goodwill is assigned to reporting units as of the date of the related acquisition. Property, Plant and Equipment Property, plant and equipment are stated at cost and depreciated over the estimated useful lives of the assets. Leasehold improvements and major renewals are capitalized and included in property, plant and equipment accounts, while expenditures for maintenance and repairs and minor renewals are charged to expense. When assets are retired, the assets and related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations. Teradyne provides for depreciation of its assets principally on the straight-line method with the cost of the assets being charged to expense over their useful lives as follows: Buildings 40 years Building improvements 5 to 10 years Leasehold improvements Lesser of lease term or 10 years Furniture and fixtures 10 years Test systems manufactured internally 6 years Machinery, equipment and software 3 to 5 years Test systems manufactured internally are used by Teradyne for customer evaluations and manufacturing and support of its customers. Teradyne depreciates the test systems manufactured internally over a six-year life to cost of revenues, engineering and development, and selling and administrative expenses. Teradyne often sells internally manufactured test equipment to customers. Upon the sale of an internally manufactured test system, the net book value of the system is transferred to inventory and expensed as cost of revenues. The net book value of internally manufactured test systems sold in the years ended December 31, 2021, 2020, and 2019 was $16.6 million, $7.3 million, and $5.0 million, respectively. Convertible Debt In accordance with ASC 815-40, 815-40 Teradyne analyzed the Warrant Transactions under ASC 815-40, paid-in The provisions of ASC 470-20, “Debt with Conversion and Other Options,” are applicable to the Notes. ASC 470-20 requires Teradyne to separately account for the liability (debt) and equity (conversion feature) components of the Notes in a manner that reflects Teradyne’s nonconvertible debt borrowing rate at the date of issuance when interest cost is recognized in subsequent periods. Teradyne allocated $ million of the initial $ million principal amount of the Notes to the equity component, which represents a discount to the debt and will be amortized to interest expense using the effective interest method through December 2023. In accounting for the conversions of the Notes pursuant to the terms of the original December 12, 2016 agreement, Teradyne calculated gain or loss on extinguishment equal to the difference between the calculated fair value of the debt immediately prior to its conversion and the carrying amount of the debt component including any unamortized debt discount or issuance costs. The calculated gain or loss is recorded in the consolidated statement of operations. Teradyne determined the conversion value of the conversion transactions by calculating the fair value of debt immediately prior to conversion using an updated remaining expected life of the debt instrument and an updated borrowing rate for a similar debt instrument that does not have an associated convertible feature. In accounting for the conversions of the Notes pursuant to the terms of the original December 12, 2016 agreement, Teradyne calculated gain or loss on extinguishment equal to the difference between the calculated fair value of the debt immediately prior to its conversion and the carrying amount of the debt component including any unamortized debt discount or issuance costs. The calculated gain or loss is recorded in the consolidated statement of operations. Teradyne determined the conversion value of the conversion transactions by calculating the fair value of debt immediately prior to conversion using an updated remaining expected life of the debt instrument and an updated borrowing rate for a similar debt instrument that does not have an associated convertible feature. Leases Teradyne adopted Accounting Standards Update (“ASU”) 2016-02, “ Leases (Topic 842) Leases (Topic 842): Targeted Improvements Under ASC 842, a contract is or contains a lease when Teradyne has the right to control the use of an identified asset. Teradyne determines if an arrangement is a lease at inception of the contract, which is the date on which the terms of the contract are agreed to and the agreement creates enforceable rights and obligations. The commencement date of the lease is the date that the lessor makes an underlying asset available for use by Teradyne. As of December 31, 2021, Teradyne does not have material leases that have not yet commenced. Teradyne determines if the lease is an operating or finance lease at the lease commencement date based upon the terms of the lease and the nature of the asset. The lease term used to calculate the lease liability includes options to extend or terminate the lease when it is reasonably certain that the option will be exercised. For leases commencing after January 1, 2019, the lease liability is measured at the present value of future lease payments, discounted using the discount rate for the lease at the commencement date. As Teradyne is typically unable to determine the implicit rate, Teradyne uses an incremental borrowing rate based on the lease term and economic environment at commencement date. Teradyne initially measures payments based on an index by using the applicable rate at lease commencement. Variable payments that do not depend on an index are not included in the lease liability and are recognized as they are incurred. The ROU asset is initially measured as the amount of lease liability, adjusted for any initial lease costs, prepaid lease payments, and reduced by any lease incentives. Teradyne’s contracts often include non-lease non-lease Engineering and Development Costs Teradyne’s products are highly technical in nature and require a large and continuing engineering and development effort. Software development costs incurred prior to the establishment of technological feasibility are charged to expense. Software development costs incurred subsequent to the establishment of technological feasibility are capitalized until the product is available for release to customers. To date, the period between achieving technological feasibility and general availability of the product has been short and software development costs eligible for capitalization have not been material. Engineering and development costs are expensed as incurred and consist primarily of salaries, contractor fees including non-recurring engineering charges related to product design, allocated facility costs, depreciation, and tooling costs. Stock Compensation Plans and Employee Stock Purchase Plan Stock-based compensation expense is based on the grant-date fair value estimated in accordance with the provisions of ASC 718-10, “ Compensation-Stock Compensation Excess tax benefits or tax deficiencies are recognized as a discrete tax benefit or discrete tax expense to the current income tax provision in Teradyne’s consolidated statements of operations, all excess tax benefits related to share-based payments are reported as cash flows from operating activities, and all cash payments made to taxing authorities on the employees’ behalf for withheld shares are presented as financing activities on the statement of cash flows. Income Taxes Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The measurement of deferred tax assets is reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be realized. Teradyne performed the required assessment of positive and negative evidence regarding the realization of the net deferred tax assets in accordance with ASC 740, “Accounting for Income Taxes.” Advertising Costs Teradyne expenses all advertising costs as incurred. Advertising costs were $13.4 million, $12.8 million and $16.6 million in 2021, 2020 and 2019, respectively. Translation of Non-U.S. The functional currency for all non-U.S. non-monetary Net foreign exchange gains and losses resulting from remeasurement are included in other (income) expense, net. For the years ended December 31, 2021, 2020 and 2019, (gains) losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies were $(2.1) million, $2.6 million, and $(1.6) million, respectively. These amounts do not reflect the corresponding (gains) losses from foreign exchange contracts. See Note H: “Financial Instruments” regarding foreign exchange contracts. Net Income per Common Share Basic net income per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, diluted net income per common share is calculated by dividing net income by the sum of the weighted average number of common shares plus common stock equivalents, if applicable. With respect to its convertible debt issued in 2016, Teradyne is required to settle the principal of the convertible debt in cash; accordingly, the principal amount is excluded from the determination of diluted earnings per share. As a result, Teradyne is accounting for the conversion spread using the treasury stock method. Comprehensive Income Comprehensive income includes net income, unrealized pension and postretirement prior service costs and benefits, unrealized gains and losses on investments in debt marketable securities and foreign currency translation adjustment.

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	12 Months Ended
	Dec. 31, 2021
Recently Issued Accounting Pronouncements	C. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In August 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020-06 if-converted On November 4, 2021, Teradyne made an irrevocable election under the indenture entered into between Teradyne and Wilmington Trust, National Association, as trustee (the “Indenture”) for the issuance of the 1.25% convertible senior unsecured notes (the “Notes”) due December 15, 2023 to require the principal portion of the remaining Notes to be settled in cash. Upon adoption of ASU 2020-06, only the amounts settled in excess of the principal will be considered in diluted earnings per share under the if-converted method. Teradyne has adopted the standard effective January 1, 2022 using the modified retrospective method of transition. As a result of adoption Teradyne expects to record an entry to increase current debt, debt, and retained earnings by million, respectively. Mezzanine equity and additional paid-in capital are expected to be reduced by million combined. The adoption of ASU 2020-06 will have an immaterial impact on our results of operations, statement of cash flows, and earnings per share.

Acquisitions and Investments in

Acquisitions and Investments in Other Company	12 Months Ended
	Dec. 31, 2021
Acquisitions and Investments in Other Company	D. ACQUISITIONS AND INVESTMENT S Acquisitions AutoGuide LLC On November 13, 2019, Teradyne acquired 100% of the membership interests of AutoGuide, LLC (“AutoGuide”), a maker of high-payload AMRs, based in Chelmsford, MA, an emerging and fast growing segment of the global forklift market. The total purchase price was approximately $81.6 million, which included cash paid of approximately $57.6 million and $24.0 million in fair value of contingent consideration payable upon achievement of certain performance targets, extending potentially through 2022. At December 31, 2021, the maximum contingent consideration that could be paid is $87.7 million. The contingent consideration is payable upon achievement of certain thresholds and targets for revenue and earnings before interest and taxes for periods from January 1, 2019 to December 31, 2020, January 1, 2019 to December 31, 2021, and January 1, 2019 to December 31, 2022. The valuation of the contingent consideration is dependent on the following assumptions: forecasted revenues, revenue volatility, earnings before interest and taxes, and discount rate. These assumptions were estimated based on a review of the historical and projected results. The AutoGuide 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. AutoGuide’s AMRs are used for material transport of payloads up to 4,500 kg in manufacturing, warehouse and logistics applications. These products complement Mobile Industrial Robots A/S (“MiR”) lower payload products and expand the Industrial Automation segment, which is a key component of Teradyne’s growth strategy . AutoGuide’s results have been included in Teradyne’s Industrial Automation segment from the date of acquisition. For the period from November 13, 2019 Pro Forma Information The following unaudited pro forma information gives effect to the acquisition of AutoGuide as if the acquisition occurred on January 1, 2018. 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: December 31, 2019 (in thousands, except per share amount) Revenues $ 2,303,737 Net income $ 464,602 Net income per common share: Basic $ 2.73 Diluted $ 2.59 Pro forma results for the year ended December 31, 2019 were adjusted to exclude $1.2 million of AutoGuide acquisition related costs and Lemsys SA On January 30, 2019, Teradyne acquired all of the issued and outstanding shares of Lemsys SA (“Lemsys”) for a total purchase price of approximately $9.1 million. Lemsys strengthens Teradyne’s position in the electrification trends of vehicles, solar and wind power, and industrial applications. The Lemsys acquisition was accounted for as a business combination and, accordingly, the results have been included in Teradyne’s Semiconductor Test segment from the date of acquisition. Teradyne’s final allocation of the purchase price was goodwill of $1.4 million, which is not deductible for tax purposes, acquired intangible assets of $4.6 million with an average estimated useful life of 5.2 years, and $3.1 million of net tangible assets. The acquisition was not material to Teradyne’s consolidated financial statements. Investment s On June 1, 2021, Teradyne invested $12.0 million in MachineMetrics, Inc. (“MachineMetrics”), a private company that develops and sells products to improve manufacturing performance through automated machine data collection, alerting, and analytics. Teradyne’s investment in MachineMetrics aligns with its strategy of providing and investing in leading edge products for automating industrial production processes in growing markets. The investment was recorded at cost and is evaluated for impairment or an indication of changes in fair value resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer on a quarterly basis. At December 31 , 2021 , the value of the investment was $12.0 million, and there was no change during the year ended December 31 , 2021 . On June 3, 2019

Revenue

Revenue	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue	E. REVENUE Disaggregation of Revenue The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines. Semiconductor Test Industrial Automation Wireless Test Corporate and Other Total System- Memory System Test Universal Mobile AutoGuide (in thousands) For the Year Ended December 31, 2021 (1) Timing of Revenue Recognition Point in Time $ 1,989,979 $ 365,441 $ 409,383 $ 305,512 $ 60,778 $ 106 $ 204,247 $ — $ 3,335,446 Over Time 256,751 30,171 58,356 5,670 2,766 1,073 12,648 — 367,435 Total $ 2,246,730 $ 395,612 $ 467,739 $ 311,182 $ 63,544 $ 1,179 $ 216,895 $ — $ 3,702,881 Geographical Market Asia Pacific $ 2,076,647 $ 381,444 $ 306,812 $ 81,456 $ 12,919 $ — $ 172,103 $ — $ 3,031,381 Americas 102,702 10,665 135,230 94,897 24,890 1,179 36,173 — 405,736 Europe, Middle East and Africa 67,381 3,503 25,697 134,829 25,735 — 8,619 — 265,764 Total $ 2,246,730 $ 395,612 $ 467,739 $ 311,182 $ 63,544 $ 1,179 $ 216,895 $ — $ 3,702,881 For the Year Ended December 31, 2020 (1) Timing of Revenue Recognition Point in Time $ 1,659,414 $ 363,324 $ 348,454 $ 214,212 $ 44,622 $ 10,911 $ 163,834 $ (604 ) $ 2,804,167 Over Time 217,975 18,884 61,275 7,269 211 2,506 9,182 — 317,302 Total $ 1,877,389 $ 382,208 $ 409,729 $ 221,481 $ 44,833 $ 13,417 $ 173,016 $ (604 ) $ 3,121,469 Geographical Market Asia Pacific $ 1,744,593 $ 364,000 $ 258,521 $ 60,277 $ 6,471 $ — $ 143,969 $ — $ 2,577,831 Americas 77,671 12,999 128,482 64,164 16,769 13,417 22,544 (604 ) 335,442 Europe, Middle East and Africa 55,125 5,209 22,726 97,040 21,593 — 6,503 — 208,196 Total $ 1,877,389 $ 382,208 $ 409,729 $ 221,481 $ 44,833 $ 13,417 $ 173,016 $ (604 ) $ 3,121,469 For the Year Ended December 31, 2019 (1) Timing of Revenue Recognition Point in Time $ 1,070,375 $ 247,221 $ 237,686 $ 244,515 $ 44,329 $ 1,144 $ 148,322 $ (515 ) $ 1,993,077 Over Time 216,065 18,910 49,769 7,843 74 234 8,993 — 301,888 Total $ 1,286,440 $ 266,131 $ 287,455 $ 252,358 $ 44,403 $ 1,378 $ 157,315 $ (515 ) $ 2,294,965 Geographical Market Asia Pacific $ 1,152,881 $ 238,714 $ 132,826 $ 68,027 $ 9,513 $ — $ 126,549 $ — $ 1,728,510 Americas 73,257 23,826 129,840 71,926 14,438 1,378 24,234 (515 ) 338,384 Europe, Middle East and Africa 60,302 3,591 24,789 112,405 20,452 — 6,532 — 228,071 Total $ 1,286,440 $ 266,131 $ 287,455 $ 252,358 $ 44,403 $ 1,378 $ 157,315 $ (515 ) $ 2,294,965 (1) Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.” Contract Balances For the years ended December 31, 2021, 2020 and 2019, Teradyne recognized $102.5 million, $91.0 million and $65.6 million, respectively, that was included within the deferred revenue and customer advances balances at the beginning of the period. This revenue primarily relates to undelivered hardware, extended warranties, training, application support, and post contract support. Each of these represents a distinct performance obligation. As of December 31, 2021 .

Inventories

Inventories	12 Months Ended
	Dec. 31, 2021
Inventories	F. INVENTORIES Inventories, net consisted of the following at December 31, 2021 and 2020: 2021 2020 (in thousands) Raw material s $ 155,641 $ 114,133 Work-in-process 37,740 25,408 Finished goods 49,949 82,648 $ 243,330 $ 222,189 Inventory reserves for the years ended December 31, 2021 and 2020 were $114.1 million and $110.6 million, respectively.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment	G. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment, net consisted of the following at December 31, 2021 and 2020: 2021 2020 (in thousands) Land $ 17,207 $ 17,207 Buildings 126,468 108,221 Machinery, equipment and software 994,828 956,035 Furniture and fixtures 28,743 28,487 Leasehold improvements 64,110 61,276 Construction in progress 8,105 13,098 1,239,461 1,184,324 Less: accumulated depreciation 852,221 789,524 $ 387,240 $ 394,800 Depreciation of property, plant and equipment for the years ended December 31, 2021, 2020, and 2019 was $91.1 million, $80.1 million, and $70.8 million, respectively. As of December 31, 2021 and 2020, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $13.4 million and $23.4 million, respectively. As of December 31, 2021 and 2020, the accumulated depreciation on these test systems was $8.7 million and $7.5 million, respectively.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2021
Financial Instruments	H. FINANCIAL INSTRUMENTS 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 recognizes the changes in fair value of equity securities directly in earnings. Teradyne’s available-for-sale 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. During the years ended December 31, 2021 and 2020, there were no transfers in or out of Level 1, Level 2, or Level 3 financial instruments. Realized gains recorded in 2021, 2020, and 2019 were $3.1 million, $4.6 million, and $1.3 million, respectively. No realized losses were recorded in 2021. Realized losses recorded in 2020 and 2019 were $0.3 million and $0.2 million, respectively. Realized gains and losses are included in other (income) expense, net. Unrealized gains on equity securities recorded during the years ended December 31, 2021 and 2020 were $5.1 million and $9.6 million, respectively. Unrealized losses on equity securities recorded during the years ended December 31, 2021 and 2020 were $1.8 million and $6.0 million, respectively. Unrealized gains and losses on equity securities are included in other (income) expense, net. Unrealized gains and losses on The cost of securities sold is based on average cost. 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 December 31, 2021 and 2020: December 31, 2021 Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs ( Level Significant Unobservable Inputs (Level 3) Total (in thousands) Assets Cash $ 628,740 $ — $ — $ 628,740 Cash equivalents 412,212 81,247 — 493,459 Available for sale securities: Commercial paper — 189,620 — 189,620 U.S. Treasury securities — 77,789 — 77,789 Corporate debt securities — 56,901 — 56,901 Debt mutual funds 7,971 — — 7,971 U.S. government agency securities — 4,610 — 4,610 Certificates of deposit and time deposits — 1,356 — 1,356 Non-U.S. government securities — 589 — 589 Equity securities: Mutual funds 39,253 — — 39,253 Total $ 1,088,176 $ 412,112 $ — $ 1,500,288 Derivative assets — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Derivative liabilities — 118 — 118 Total $ — $ 118 $ — $ 118 Reported as follows: (Level 1) (Level 2 (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 1,040,952 $ 81,247 $ — $ 1,122,199 Marketable securities — 244,231 — 244,231 Long-term marketable securities 47,224 86,634 — 133,858 Prepayments — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Other current liabilities $ — $ 118 $ — $ 118 Total $ — $ 118 $ — $ 118 December 31, 2020 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 $ 443,166 $ — $ — $ 443,166 Cash equivalents 347,768 123,187 — 470,955 Available for sale securities: U.S. Treasury securities — 258,304 — 258,304 Commercial paper — 254,413 — 254,413 Corporate debt securities — 83,615 — 83,615 Debt mutual funds 8,565 — — 8,565 U.S. government agency securities — 4,339 — 4,339 Certificates of deposit and time deposits — 979 — 979 Non-U.S. government securities — 625 — 625 Equity securities: Mutual funds 29,420 — — 29,420 Total $ 828,919 $ 725,462 $ — $ 1,554,381 Derivative assets — 95 — 95 Total $ 828,919 $ 725,557 $ — $ 1,554,476 Liabilities Contingent consideration $ — $ — $ 7,227 $ 7,227 Derivative liabilities — 504 — 504 Total $ — $ 504 $ 7,227 $ 7,731 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 790,934 $ 123,187 $ — $ 914,121 Marketable securities — 522,280 — 522,280 Long-term marketable securities 37,985 79,995 — 117,980 Prepayments — 95 — 95 Total $ 828,919 $ 725,557 $ — $ 1,554,476 Liabilities Other current liabilities $ — $ 504 $ — $ 504 Long-term contingent consideration — — 7,227 7,227 Total $ — $ 504 $ 7,227 $ 7,731 Changes in the fair value of Level 3 contingent consideration for the years ended December 31, 2021 and 2020 were as follows: Contingent Consideration (in thousands) Balance at December 31, 2019 $ 39,705 Foreign currency impact (355 ) Payments (1) (8,852 ) Fair value adjustment (2) (23,271 ) Balance at December 31, 2020 7,227 Foreign currency impact — Payments — Fair value adjustment (3) (7,227 ) Balance at December 31, 2021 $ — (1) During the year ended December 31, 2020, Teradyne paid $8.9 million of contingent consideration for the earn-out in connection with the acquisition of Mobile Industrial Robots (“MiR”). (2) During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of AutoGuide was decreased by $19.7 million primarily due to a decrease in forecasted revenues and earnings before interest and taxes. During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $3.5 million primarily due to a decrease in forecasted revenues. (3) During the year ended December 31, 2021, the fair value of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide was reduced to zero, which resulted in a benefit of $7.2 million, primarily due to a decrease in forecasted revenues and earnings before interest and taxes. As of December 31, 2021, the maximum amount of contingent consideration that could be paid in connection with the acquisition of AutoGuide is $87.7 million. The remaining earn-out period ends on December 31, 2022. The sellers of AutoGuide have filed an arbitration claim against Teradyne related to allegations of non-compliance with the earn-out obligations. The carrying amounts and fair values of Teradyne’s financial instruments at December 31, 2021 and 2020 were as follows: December 31, 2021 December 31, 2020 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 1,122,199 $ 1,122,199 $ 914,121 $ 914,121 Marketable securities 378,089 378,089 640,260 640,260 Derivative assets 92 92 95 95 Liabilities Contingent consideration — — 7,227 7,227 Derivative liabilities 118 118 504 504 Convertible debt (1) 108,426 604,648 410,111 1,739,553 (1) The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion features. The fair values of accounts receivable, net and accounts payable approximate the carrying amount due to the short-term nature of these instruments. The following tables summarize the composition of available-for-sale December 31, 2021 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Value Fair Market Value of Investments with Unrealized Losses (in thousands) Commercial paper $ 189,614 $ 15 $ (9 ) $ 189,620 $ 22,784 U.S. Treasury securities 77,707 551 (470 ) 77,789 46,435 Corporate debt securities 52,266 4,863 (227 ) 56,901 19,422 Debt mutual funds 7,928 43 — 7,971 — U.S. government agency securities 4,617 5 (12 ) 4,610 3,296 Certificates of deposit and time deposits 1,356 — — 1,356 — Non-U.S. government securities 589 — — 589 — $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 244,213 $ 64 $ (46 ) $ 244,231 $ 54,798 Long-term marketable securities 89,864 5,413 (672 ) 94,605 37,139 $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 December 31, 2020 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Value Fair Market Value of Investments with Unrealized Losses (in thousands) U.S. Treasury securities $ 257,132 $ 1,330 $ (158 ) $ 258,304 $ 17,243 Commercial paper 254,404 10 (1 ) 254,413 12,173 Corporate debt securities 76,129 7,539 (53 ) 83,615 39,896 Debt mutual funds 8,413 152 — 8,565 — U.S. government agency securities 4,294 46 (1 ) 4,339 1,106 Certificates of deposit and time deposits 979 — — 979 — Non-U.S. government securities 625 — — 625 — $ 601,976 $ 9,077 $ (213 ) $ 610,840 $ 70,418 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 522,228 $ 92 $ (40 ) $ 522,280 $ 61,806 Long-term marketable securities 79,748 8,985 (173 ) 88,560 8,612 $ 601,976 $ 9,077 $ (213 ) $ 610,840 $ 70,418 As of December 31, 2021, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $85.4 million and $6.5 million, respectively. As of December 31, 2020, the fair market value of investments with unrealized losses less than one year totaled $70.4 million. 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 December 31, 2021 and 2020, were not other than temporary. The contractual maturities of investments in available-for-sale marketable securities held at December 31, 2021 were as follows: Cost Fair Value (in thousands) Due within one year $ 244,213 $ 244,231 Due after 1 year through 5 years 41,459 41,377 Due after 5 years through 10 years 6,085 6,434 Due after 10 years 34,392 38,823 Total $ 326,149 $ 330,865 Contractual maturities of investments in available-for-sale marketable securities held at December 31, 2021 exclude debt mutual funds with the fair market value of $8.0 million as they do not have a contractual maturity date. 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 the monetary assets and liabilities denominated in foreign currencies. At December 31, 2021 and 2020, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts: December 31, 2021 December 31, 2020 Buy Position Sell Position Net Total Buy Position Sell Position Net Total (in millions) Japanese Yen $ (31.4 ) $ — $ (31.4 ) $ (14.1 ) $ — $ (14.1 ) Taiwan Dollar (35.1 ) — (35.1 ) (27.9 ) — (27.9 ) Korean Won (4.2 ) — (4.2 ) (5.3 ) — (5.3 ) British Pound Sterling (1.8 ) — (1.8 ) (1.0 ) — (1.0 ) Singapore Dollar — 61.9 61.9 — 52.3 52.3 Euro — 44.9 44.9 — 43.9 43.9 Philippine Peso — 3.9 3.9 — 5.0 5.0 Chinese Yuan — 2.8 2.8 — 3.4 3.4 Total $ (72.5 ) $ 113.5 $ 41.0 $ (48.3 ) $ 104.6 $ 56.3 The fair value of the outstanding contracts was a loss of $0.1 million and $0.4 million, respectively, at December 31, 2021 and 2020. 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 as of December 31, 2021 and 2020: Balance Sheet Location December 31, 2021 December 31, 2020 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Prepayments $ 92 $ 95 Foreign exchange contracts Other current liabilities (118 ) (504 ) Total derivatives $ (26 ) $ (409 ) The following table summarizes the effect of derivative instruments in the statements of operations recognized for the years ended December 31, 2021, 2020, and 2019. Location of Losses Recognized in Statement of Operations December 31, 2021 December 31, 2020 December 31, 2019 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ 6,488 $ 3,515 $ 5,960 (1) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. (2) For the year ended December 31, 2021 net gains from remeasurement of monetary assets and liabilities denominated in foreign currencies were $2.1 million. (3) For the year ended December 31, 2020, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $2.6 million. (4) For the year ended December 31, 2019 net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $1.6 million. See Note J: “Debt” regarding derivatives related to the convertible senior notes. Concentration of Credit Risk Financial instruments which potentially subject Teradyne to concentrations of credit risk consist principally of cash equivalents, marketable securities, forward currency contracts and accounts receivable. Teradyne’s cash equivalents consist primarily of money market funds invested in U.S. Treasuries and government agencies. Teradyne’s fixed income available-for-sale marketable securities have a minimum rating of AA by one or more of the major credit rating agencies. Teradyne places foreign currency forward contracts with high credit-quality financial institutions in order to minimize credit risk exposure. Concentrations of credit risk with respect to accounts receivable are limited due to the large number of geographically dispersed customers. Teradyne performs ongoing credit evaluations of its customers’ financial condition and from time to time may require customers to provide a letter of credit from a bank to secure accounts receivable. There were no customers who accounted for more than 10% of our accounts receivable balance as of December 31, 2021. As of December 31, 2020, a customer of our Semiconductor Test segment, JA Mitsui Leasing, LTD, accounted for % of our accounts receivable balance. The balance was paid in full as of February 22, 2021.

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases	I. LEASES Teradyne has facility and auto leases, which are accounted for as operating leases. Teradyne’s facility leases are primarily used for administrative functions, research and development, manufacturing, and storage and distribution. Remaining lease terms range from less than one year to twelve years. Total lease expense for the year ended December 31, 2021 was $39.2 million and included $12.6 million of variable lease costs and $1.8 million of costs related to short-term leases, which are not recorded on the consolidated balance sheets. Total lease expense for the year ended December 31, 2020 was $38.5 million and included $12.1 million of variable lease costs and $3.4 million of costs related to short-term leases, which are not recorded on the consolidated balance sheets. Total lease expense for the year ended December 31, 2019 was $35.6 million and included $11.1 million of variable lease costs and $2.6 million of costs related to short-term leases, which are not recorded on the consolidated balance sheets. At December 31, 2021, the weighted average remaining lease term and weighted average discount rate for operating leases was 5.3 years and 4.1%, respectively. At December 31, 2020, the weighted average remaining lease term and weighted average discount rate for operating leases was 4.2 years and 4.8%, respectively. Supplemental cash flows information related to leases was as follows: For the Years Ended December 31, December 31, December 31, (in thousands) Cash paid for amounts included in the measurement of lease liabilities included in operating cash flows $ 24,593 $ 24,136 $ 19,400 Right-of-use assets obtained in exchange for new lease obligations 34,246 14,801 26,739 Maturities of lease liabilities as of December 31, 2021 were as follows: Operating Lease (in thousands) 2022 $ 22,525 2023 16,187 2024 13,675 2025 10,717 2026 8,553 Thereafter 11,188 Total lease payments 82,845 Less imputed interest (6,690 ) Total lease liabilities $ 76,155

Debt

Debt	12 Months Ended
	Dec. 31, 2021
Debt	J. DEBT Convertible Senior Notes On December 12, 2016, Teradyne completed a private offering of $460.0 million aggregate principal amount of 1.25% convertible senior unsecured notes (the “Notes”) due December 15, 2023 and received net proceeds, after issuance costs, of approximately $450.8 million, $33.0 million of which was used to pay the net cost of the convertible note hedge transactions and $50.1 million of which was used to repurchase 2.0 million shares of Teradyne’s common stock under its existing stock repurchase program from purchasers of the Notes in privately negotiated transactions effected through one of the initial purchasers or its affiliates conducted concurrently with the pricing of the Note offering. The Notes will mature on December 15, 2023, unless earlier repurchased or converted. The Notes bear interest at a rate of 1.25% per year payable semiannually in arrears on September 15, 2023 price foregoing circumstances. Teradyne may satisfy its future conversion obligation by paying cash for the principal amount of the Notes and paying or delivering cash, shares of its common stock or a combination of cash and shares of its common stock, at Teradyne’s election for the amount in excess of principal. As of December 31, 2021, the conversion price was approximately $31.52 During 2021 sixty holders converted $ million resulting in a loss of $ million recorded to other (income) expense on the consolidated statement of operations. The amount of the loss was determined using the conversion value of the conversion transactions based on the fair value of debt immediately prior to conversion using an updated remaining expected life of the debt instrument and an updated borrowing rate for a similar debt instrument that does not have an associated convertible feature. As of February 23 eighty three holders had exercised the option to convert Concurrent with the offering of the Notes, Teradyne entered into convertible note hedge transactions (the “Note Hedge Transactions”) with the initial purchasers or their affiliates (the “Option Counterparties”). The Note Hedge Transactions cover, subject to customary anti-dilution adjustments, the number of shares of the common stock that underlie the Notes, with a strike price equal to the conversion price of the Notes of $ . The Note Hedge Transactions cover, subject to customary anti-dilution adjustments, approximately million shares of Teradyne’s common stock. Separately and concurrent with the pricing of the Notes, Teradyne entered into warrant transactions with the Option Counterparties (the “Warrant Transactions”) in which it sold net-share-settled (or, at its election subject to certain conditions, cash-settled) warrants to the Option Counterparties. The Warrant Transactions cover, subject to customary anti-dilution adjustments, approximately 14.6 million shares of common stock. As of December 31, 2021, the strike price of the warrants was approximately $39.55 per share. The strike price is subject to adjustment under certain circumstances. The Warrant Transactions could have a dilutive effect to Teradyne’s common stock to the extent that the market price per share of Teradyne’s common stock, as measured under the terms of the Warrant Transactions, exceeds the applicable strike price of the warrants. The Note Hedge Transactions are expected to reduce the potential dilution to Teradyne’s common stock upon any conversion of the Notes. However, the Warrant Transactions could separately have a dilutive effect to the extent that the market value per share of Teradyne’s common stock exceeds the applicable strike price of the warrant. The net cost of the Note Hedge Transactions, after being partially offset by the proceeds from the sale of the warrants, was approximately $33.0 million. In connection with establishing their initial hedge of these convertible note hedge and warrant transactions, the Option Counterparties have entered into various derivative transactions with respect to Teradyne’s common stock and/or purchased shares of Teradyne’s common stock or other securities, including the Notes, concurrent with, or shortly after, the pricing of the Notes. In addition, the Option Counterparties may modify their hedge positions by entering into or unwinding various derivative transactions with respect to Teradyne’s common stock or by selling Teradyne’s common stock or other securities, including the Notes, in secondary market transactions (and may do so during any observation period related to the conversion of the Notes). These activities could adversely affect the value of Teradyne’s common stock and the Notes. Teradyne allocated $100.8 million of the $460.0 million principal amount of the Notes to the equity component, which represents a discount to the debt and will be amortized to interest expense using the effective interest method through December 2023. Accordingly, Teradyne’s effective annual interest rate on the Notes will be approximately 5.0%. The Notes are classified as long-term debt on the balance sheet based on their amortized to interest expense using the effective The below tables represent the key components of Teradyne’s convertible senior notes: December 31, December 31, (in thousands) Debt principal $ 116,980 $ 459,971 Unamortized discount 8,554 49,860 Net carrying amount of convertible debt $ 108,426 $ 410,111 Reported as follows: December 31, December 31, (in thousands) Current debt $ 19,182 $ 33,343 Long-term debt 89,244 376,768 Net carrying amount of convertible debt $ 108,426 $ 410,111 For the year s December 31, December 31, (in thousands) Contractual interest expense on the coupon $ 3,009 $ 5,750 Amortization of the discount component and debt issue fees recognized as interest expense 11,019 15,454 Total interest expense on the convertible debt $ 14,028 $ 21,204 As of December 31, 2021, the unamortized discount was $8.6 million, which will be amortized over two years using the effective interest rate method , t million, Additional conversions of approximately $20.7 million of debt principal will occur in the first quarter of 2022. Teradyne expects to make principal interest payments of $1.5 million in the next 12 months and $1.5 million thereafter. The liability component is included in current debt and the equity component is included in convertible common shares. Revolving Credit Facility On June 27, 2019, Teradyne terminated its credit agreement, which Teradyne entered into with Barclays Bank PLC on April 27, 2015. The terminated credit agreement, which was undrawn at termination, provided for a five-year, senior secured revolving credit facility of up to $350 million. On May 1, 2020, Teradyne entered into a credit agreement (the “Credit Agreement”) with Truist Bank, as administrative agent and collateral agent, and the lenders party thereto. The Credit Agreement provides for a three-year, senior secured revolving credit facility of $400.0 million (the “Credit Facility”). On December 10, 2021, the Credit Agreement was amended to extend maturity date of the Credit Facility to December 10, 2026. The amended Credit Agreement provides that, subject to customary conditions, Teradyne may seek to obtain from existing or new lenders the available incremental amount under the Credit Facility , not the greater of $200.0 million or 15% of consolidated EBIDTA. The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from % to % per annum or LIBOR plus a margin ranging from % to % per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from % to % 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 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 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. As of December 31, 2021, the Credit Agreement was undrawn and Teradyne was in compliance with all covenants under the Credit Agreement.

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	12 Months Ended
	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss)	K. ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Changes in accumulated other comprehensive (loss) income, which is presented net of tax, consist of the following: Foreign Currency Translation Adjustment Unrealized Gains Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Balance at December 31, 2019, net of tax of $0, $946, $(1,124), respectively $ (23,514 ) $ 3,480 $ 1,180 $ (18,854 ) Other comprehensive income before reclassifications, net of tax of $0, $1,629, $0, respectively 48,903 5,839 — 54,742 Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(665), $(2), respectively — (2,365 ) (7 ) (2,372 ) Net current period other comprehensive income (loss), net of tax of $0, $964, $(2), respectively 48,903 3,474 (7 ) 52,370 Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126), respectively $ 25,389 $ 6,954 $ 1,173 $ 33,516 Other comprehensive loss before reclassifications, net of tax of $0, $(578), $0, respectively (36,207 ) (2,255 ) — (38,462 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(277), $(2), respectively — (995 ) (7 ) (1,002 ) Net current period other comprehensive loss, net of tax of $0, $(855), $(2), respectively (36,207 ) (3,250 ) (7 ) (39,464 ) Balance at December 31, 2021, net of tax of $0, $1,055, $(1,128), respectively $ (10,818 ) $ 3,704 $ 1,166 $ (5,948 ) Reclassifications out of accumulated other comprehensive (loss) inco m e Details about Accumulated Other Comprehensive (Loss) Income Components For the year s Affected Line Item in the Statements of Operations December 31, 2021 December 31, 2020 December 31, 2019 (in thousands) Available-for-sale marketable securities Unrealized gains, net of tax of $277, $665, $192, respectively $ 995 $ 2,365 $ 690 Interest income Defined benefit pension and postretirement plans: Amortization of prior service benefit, net of tax of $2, $2, $43, respectively 7 7 148 (a) Total reclassifications, net of tax of $279, $667, $235, respectively $ 1,002 $ 2,372 $ 838 Net income (a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note P: “Retirement Plans.”

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets	L. GOODWILL AND INTANGIBLE ASSETS Goodwill Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “ Intangibles—Goodwill and Other, Teradyne has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If Teradyne determines this is the case, Teradyne is required to perform a quantitative goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. If Teradyne determines that it is more likely than not that the fair value of the reporting unit is greater than its carrying amounts, the quantitative goodwill impairment test is not required. In performing the quantitative goodwill impairment test, Teradyne determines the fair value of a reporting unit using the results derived from an income approach and a market approach, weighting the fair value determined under each approach to determine an estimated fair value for a reporting unit. The income approach is estimated through the discounted cash flows (“DCF”) analysis. Determining fair value requires the exercise of significant judgment, including judgments about appropriate discount rates, perpetual growth rates, and the amount and timing of expected future cash flows. Discount rates are based on a weighted average cost of capital (“WACC”), which represents the average rate a business must pay its providers of debt and equity, plus a risk premium. The WACC used to test goodwill is derived from a group of comparable companies. The cash flows employed in the DCF analysis are derived from internal forecasts and external market forecasts. The market approach estimates the fair value of the reporting unit by utilizing the market comparable method which is based on revenue and earnings multiples from comparable companies. If the estimated fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is not impaired. If the carrying amount of a reporting unit exceeds its estimated fair value, then the goodwill is written down by the amount that carrying value exceeds the fair value of the reporting unit, but not below zero. On September 15, 2020, Teradyne announced the appointment of Gregory Smith as President of Teradyne’s Industrial Automation reportable segment effective October 1, 2020. With the appointment of Gregory Smith, the Industrial Automation reportable segment, which includes UR, MiR and AutoGuide, is considered one operating segment and one reporting unit. Teradyne performed a goodwill impairment test at the time of the change in operating segments, which indicated the fair value of Teradyne’s reporting units exceeded their carrying values. In the fourth quarter of 2021, Teradyne performed the annual goodwill impairment test, completing a quantitative assessment for the Wireless Test, and System Test reporting units and qualitative assessment for the Industrial Automation reporting unit. There was no impairment as a result of the annual test performed in the fourth quarter of 2021. Key assumptions in the goodwill valuation model are forecasted revenues, discount rate, earnings before interest and taxes, and revenue multiples from comparable companies. A change in any of these key assumptions could result in the reporting unit being impaired in a future period. In the fourth quarter of 2020, Teradyne performed the annual goodwill impairment test, completing a qualitative assessment for the Wireless Test, System Test, and Industrial Automation reporting units. There was no impairment as a result of the annual test performed in the fourth quarter of 2020. Key assumptions in the goodwill valuation model are forecasted revenues, discount rate, earnings before interest and taxes, and revenue multiples from comparable companies. A change in any of these key assumptions could result in the reporting unit being impaired in a future period. The changes in the carrying amount of goodwill by reportable segments for the years ended D e Industrial Automation Wireless Test Semiconductor Test System Test Total (in thousands) Balance at December 31, 2019: Goodwill $ 396,483 $ 361,819 $ 261,996 $ 158,699 $ 1,178,997 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) 396,483 7,976 1,456 10,516 416,431 AutoGuide acquisition (149 ) — — — (149 ) Foreign currency translation adjustment 37,418 — 159 — 37,577 Balance at December 31, 2020: Goodwill 433,752 361,819 262,155 158,699 1,216,425 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) 433,752 7,976 1,615 10,516 453,859 Foreign currency translation adjustment (27,781 ) — (54 ) — (27,835 ) Balance at December 31, 2021: Goodwill 405,971 361,819 262,101 158,699 1,188,590 Accumulated impairment losse s — (353,843 ) (260,540 ) (148,183 ) (762,566 ) $ 405,971 $ 7,976 $ 1,561 $ 10,516 $ 426,024 Intangible Assets Teradyne reviews long-lived assets for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of these assets are no longer appropriate. There were no events or circumstances indicating that the carrying value of intangible and long-lived assets may not be recoverable in 2021, 2020 and 2019. Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets: December 31, 2021 Gross Carrying Amount (1) Accumulated Amortization (1) Foreign Net Carrying Amount (in thousands) Developed technology $ 272,547 $ (223,413 ) $ (4,093 ) $ 45,041 Customer relationships 57,739 (48,921 ) 209 9,027 Tradenames and trademarks 59,387 (37,237 ) (583 ) 21,567 Total intangible assets $ 389,673 $ (309,571 ) $ (4,467 ) $ 75,635 December 31, 2020 Gross Carrying Amount Accumulated Amortization Foreign Net Carrying Amount (in thousands) Developed technology $ 272,547 $ (210,479 ) $ (1,610 ) $ 60,458 Customer relationships 66,239 (54,524 ) 305 12,020 Tradenames and trademarks 70,120 (42,344 ) 685 28,461 Total intangible assets $ 408,906 $ (307,347 ) $ (620 ) $ 100,939 (1) In 2021, $19.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization. Aggregate intangible assets amortization expense for the years ended December 31, 2021, 2020, and 2019, was $21.5 million, $30.8 million, and $40.1 million, respectively. Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2022 $ 20,081 2023 19,592 2024 19,283 2025 11,546 2026 2,423 Thereafter 2,710

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies	M. COMMITMENTS AND CONTINGENCIES Purchase Commitments As of December 31, 2021, Teradyne had entered into non-cancelable purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $884.3 million, of which $839.2 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 such as, but not limited to, patent, employment, commercial and environmental matters. Teradyne believes that it has meritorious defenses against all pending claims and intends to vigorously contest them. While it is not possible to predict or determine the outcomes of any pending claims or to provide possible ranges of losses that may arise, Teradyne believes the potential losses associated with all of these actions are unlikely to have a material adverse effect on its business, financial position or results of operations. On March 8, 2021, Industrial Automation LLC submitted a demand for arbitration against Teradyne and AutoGuide in Wilmington, Delaware alleging that Teradyne and AutoGuide breached certain provisions of the Membership Interests Purchase Agreement (the “Purchase Agreement”), dated as of October 18, 2019, among Industrial Automation LLC, Teradyne and AutoGuide. The arbitration demand seeks full acceleration of the maximum earnout amount payable under the Purchase Agreement, or $106.9 million, for the alleged breach of the earnout provisions of the Purchase Agreement. On March 26, 2021, Teradyne and AutoGuide filed an answer denying that Teradyne and AutoGuide breached any provisions of the Purchase Agreement. The arbitration hearing is scheduled for March 21, 2022. While it is not possible at this stage to predict the outcome of the arbitration, a material loss is reasonably possible, but not estimab le. Teradyn Guarantees and Indemnification Obligations Teradyne provides indemnification, to the extent permitted by law, to its officers, directors, employees and agents for liabilities arising from certain events or occurrences, while the officer, director, employee, or agent, is or was serving, at Teradyne’s request in such capacity. Teradyne may enter into indemnification agreements with certain of its officers and directors. With respect to acquisitions, Teradyne provides indemnifications to or assumes indemnification obligations for the current and former directors, officers and employees of the acquired companies in accordance with the acquired companies’ by-laws and charter. As a matter of practice, Teradyne has maintained directors’ and officers’ liability insurance coverage including coverage for directors and officers of acquired companies. Teradyne enters into agreements in the ordinary course of business with customers, resellers, distributors, integrators and suppliers. Most of these agreements require Teradyne to defend and/or indemnify the other party against intellectual property infringement claims brought by a third party with respect to Teradyne’s products. From time to time, Teradyne also indemnifies customers and business partners for damages, losses and liabilities they may suffer or incur relating to personal injury, personal property damage, product liability, breach of confidentiality obligations and environmental claims relating to the use of Teradyne’s products and services or resulting from the acts or omissions of Teradyne, its employees, authorized agents or subcontractors. On occasion, Teradyne has also provided guarantees to customers regarding the delivery and performance of its products in addition to the warranty described below. As a matter of ordinary course of business, Teradyne warrants that its products will substantially perform in accordance with its standard published specifications in effect at the time of delivery. Most warranties have a one-year duration commencing from installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based upon historical experience. When Teradyne receives revenue for extended warranties beyond the standard duration, the revenue is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. As of December 31, 2021, and 2020, Teradyne had a product warranty accrual of $24.6 million and $16.6 million, respectively, included in other accrued liabilities, and revenue deferrals related to extended warranties of $64.2 million and $51.9 million, respectively, included in short and long-term deferred revenue and customer advances. In addition, in the ordinary course of business, Teradyne provides minimum purchase guarantees to certain vendors to ensure continuity of supply against the market demand. Although some of these guarantees provide penalties for cancellations and/or modifications to the purchase commitments as the market demand decreases, most of the guarantees do not. Therefore, as the market demand decreases, Teradyne re-evaluates these guarantees and determines what charges, if any, should be recorded. With respect to its agreements covering product, business or entity divestitures and acquisitions, Teradyne provides certain representations, warranties and covenants to purchasers and agrees to indemnify and hold such purchasers harmless against breaches of such representations, warranties and covenants. Many of the indemnification claims have a definite expiration date while some remain in force indefinitely. With respect to its acquisitions, Teradyne may, from time to time, assume the liability for certain events or occurrences that took place prior to the date of acquisition. As a matter of ordinary course of business, Teradyne occasionally guarantees certain indebtedness obligations of its subsidiary companies, limited to the borrowings from financial institutions, purchase commitments to certain vendors, and lease commitments to landlords. Based on historical experience and information known as of December 31, 2021, and 2020, except for product warranty, Teradyne has not recorded any liabilities for these guarantees and obligations because the amount would be immaterial.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2021
Net Income per Common Share	N. NET INCOME PER COMMON SHARE The following table sets forth the computation of basic and diluted net income per common share: 2021 2020 2019 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 1,014,589 $ 784,147 $ 467,468 Weighted average common shares-basic 164,960 166,120 170,425 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 9,956 6,989 2,698 Incremental shares from assumed conversion of convertible notes (2) 7,435 8,528 4,909 Restricted stock units 1,180 1,264 1,236 Stock options 86 131 178 Employee stock purchase rights 8 10 13 Dilutive potential common shares 18,665 16,922 9,034 Weighted average common shares-diluted 183,625 183,042 179,459 Net income per common share-basic $ 6.15 $ 4.72 $ 2.74 Net income per common share-diluted $ 5.53 $ 4.28 $ 2.60 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.55, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. (2) Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.52, multiplied by 4.4 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period. The computation of diluted net income per common share for 2021 and 2020 excludes the effect of the potential exercise of stock options to purchase approximately 0.1 million shares and restricted stock units to purchase approximately 0.1 million shares because the effect would have been anti-dilutive.

Restructuring and Other

Restructuring and Other	12 Months Ended
	Dec. 31, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Other	O. RESTRUCTURING AND OTHER During the year ended December 31, 2021, Teradyne recorded $1.5 million of severance charges primarily in Industrial Automation, $0.5 million of acquisition related compensation and expenses and $14.5 m During the year ended December 31, 2020, Teradyne recorded a $19.7 million gain for the decrease in the fair value of the AutoGuide contingent consideration liability, and a $3.5 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by a During the year ended December 31, 2019, Teradyne recorded a gain of $22.2 million from the decrease in the fair value of the MiR contingent consideration liability, partially offset by a $3.0 million increase in the fair value of the AutoGuide contingent consideration, $2.9 million of severance charges related to headcount reductions primarily in Semiconductor Test and Industrial Automation, and $2.5 million for acquisition related expenses and compensation

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2021
Retirement Plans	P. 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 the 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 (the “IRC”), as well as unfunded qualified foreign plans. In 2021, Teradyne’s projected benefit obligations decreased primarily due to actuarial gains of approximately $8.7 million across all pension plans from increases in discount rates, and approximately $3.3 million gain from foreign exchange effects for foreign plans. In 2020, Teradyne’s projected benefit obligations increased primarily due to actuarial losses of approximately $27.6 million across all pension plans from decreases in discount rates, and approximately $4.0 million from unfavorable foreign exchange effects for the German plan, partially offset by a transfer of obligations for approximately 115 retiree participants to an insurance company which resulted in a $24.4 million reduction in the projected benefit obligations and pension assets. We also recorded a settlement loss of $0.5 million related to the retiree group annuity transaction. The December 31 balances of these defined benefit pension plans assets and obligations are shown below: 2021 2020 United States Foreign United States Foreign (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 202,233 $ 50,988 $ 203,791 $ 43,952 Service cost 1,784 941 1,773 907 Interest cost 4,427 337 5,770 516 Actuarial (gain) loss (6,432 ) (2,257 ) 24,671 2,951 Benefits paid (9,337 ) (925 ) (9,844 ) (1,299 ) Retiree annuity purchase — — (24,379 ) — Liability (gain) loss due to settlement (204 ) — 451 — Non-U.S. currency movement — (3,310 ) — 3,961 End of year 192,472 45,774 202,233 50,988 Change in plan assets: Fair value of plan assets: Beginning of year 158,855 1,856 166,932 1,586 Actual return on plan assets (3,217 ) 33 23,048 67 Company contributions 3,276 1,022 3,098 1,079 Benefits paid (9,337 ) (925 ) (9,844 ) (988 ) Retiree annuity purchase — — (24,379 ) — Non-U.S. currency movement — 31 — 112 End of year 149,578 2,017 158,855 1,856 Funded status $ (42,894 ) $ (43,757 ) $ (43,378 ) $ (49,132 ) The following table provides amounts recorded within the account line items of the statements of financial position as of December 31: 2021 2020 United States Foreign United States Foreign (in thousands) Retirement plans assets $ 15,110 $ — $ 17,468 $ — Accrued employees’ compensation and withholdings (3,288 ) (936 ) (3,273 ) (1,019 ) Retirement plans liabilities (54,716 ) (42,821 ) (57,573 ) (48,113 ) Funded status $ (42,894 ) $ (43,757 ) $ (43,378 ) $ (49,132 ) The accumulated benefit obligation for the United States defined benefit pension plans was $187.5 million and $196.7 million at December 31, 2021 and 2020, respectively. The accumulated benefit obligation for foreign defined benefit pension plans was $42.5 million and $46.5 million at December 31, 2021 and 2020, respectively. Information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31: 2021 2020 United States Foreign United States Foreign (in millions) Projected benefit obligatio n $ 58.0 $ 45.8 $ 60.8 $ 51.0 Accumulated benefit obligation 55.7 42.5 58.5 46.5 Fair value of plan assets — 2.0 — 1.9 Expense For the years ended December 31, 2021, 2020, and 2019, Teradyne’s net periodic pension cost (income) was comprised of the following: 2021 2020 2019 United Foreign United Foreign United Foreign (in thousands) Components of Net Periodic Pension Cost (Income): Service cost $ 1,784 $ 941 $ 1,773 $ 907 $ 1,608 $ 751 Interest cost 4,427 337 5,770 516 7,189 691 Expected return on plan assets (3,858 ) (67 ) (4,840 ) (65 ) (6,042 ) (29 ) Net actuarial loss (gain) 643 (2,223 ) 6,463 2,949 2,973 4,485 Settlement (gain) loss (204 ) — 451 — — — Total net periodic pension cost (income) $ 2,792 $ (1,012 ) $ 9,617 $ 4,307 $ 5,728 $ 5,898 Weighted Average Assumptions to Determine Net Periodic Pension Cost at January 1: 2021 2020 2019 United States Foreign United States Foreign United States Foreign Discount rate 2.2 % 0.7 % 2.8 % 1.1 % 4.1 % 1.8 % Expected return on plan assets 2.4 3.5 3.0 3.8 4.3 2.0 Salary progression rate 2.4 2.3 2.6 2.5 2.3 2.5 Weighted Average Assumptions to Determine Pension Obligations at December 31: 2021 2020 United States Foreign United States Foreign Discount rate 2.6 % 1.1 % 2.2 % 0.7 % Salary progression rate 2.4 2.2 2.4 2.3 In developing the expected return on plan assets assumption, Teradyne evaluates input from its investment manager and pension consultants, including their forecast of asset class return expectations. Teradyne believes that 2.4% was an appropriate rate to use for fiscal year 2021 for the U.S. Qualified Pension Plan (“U.S. Plan”). Teradyne recognizes net actuarial gains and losses and the change in the fair value of the plan assets in its operating results in the year in which they occur or upon any interim remeasurement of the plans. Teradyne calculates the expected return on plan assets using the fair value of the plan assets. Actuarial gains and losses are generally measured annually as of December 31 and, accordingly, recorded during the fourth quarter of each year or upon any interim remeasurement of the plans. The discount rate utilized to determine future pension obligations for the U.S. Plan is based on FTSE Pension Index adjusted for the plan’s expected cash flows and was 2.65% at December 31, 2021, up from 2.3% at December 31, 2020. Plan Assets As of December 31, 2021, the fair value of Teradyne’s pension plans’ assets totaled $151.6 million, of which $149.6 million was related to the U.S. Plan and $2.0 million was related to the Taiwan defined benefit pension plan. Substantially all of Teradyne’s pension plans’ assets are held in individual trusts, which were established for the investment of assets of Teradyne’s sponsored retirement plans. The following table provides weighted average pension asset allocation by asset category at December 31, 2021 and 2020: 2021 2020 United States Foreign United States Foreign Fixed income securities 94.0 % — % 94.0 % — % Equity securities 5.0 — 5.0 — Other 1.0 100.0 1.0 100.0 100.0 % 100.0 % 100.0 % 100.0 % The assets of the U.S. Plan are overseen by the Teradyne Fiduciary Committee which is comprised of members of senior management drawn from appropriate diversified levels of the management team. The Fiduciary Committee is responsible for setting the policy that provides the framework for management of the U.S. Plan assets. In accordance with its responsibilities, the Fiduciary Committee meets on a regular basis to review the performance of the U.S. Plan assets and compliance with the investment policy. The policy sets forth an investment structure for managing U.S. Plan assets, including setting the asset allocation ranges, which are expected to provide an appropriate level of overall diversification required to maximize the long-term return on plan assets for a prudent and reasonable level of risk given prevailing market conditions, total investment return over the long term, and preservation of capital, while maintaining sufficient liquidity to pay the benefits of the U.S. Plan. The investment portfolio will not, at any time, have a direct investment in Teradyne stock. It may have indirect investment in Teradyne stock, if one of the funds selected by the investment manager invests in Teradyne stock. In developing the asset allocation ranges, third party asset allocation studies are periodically performed that consider the current and expected positions of the plan assets and funded status. Based on this study and other appropriate information, the Fiduciary Committee establishes asset allocation ranges taking into account acceptable risk targets and associated returns. The investment return objectives are to avoid excessive volatility and produce a rate of return that at least matches the Policy Index identified below. The manager’s investment performance is reviewed at least annually. Results for the total portfolio and for each major category of assets are evaluated in comparison with appropriate market indices and the Policy Index. The target asset allocation and the index for each asset category for the U.S. Plan, per the investment policy, are as follows: Asset Category: Policy Index: Target Allocation U.S. corporate fixed income Barclays U.S. Corporate A or Better Index 75 % Global equity MSCI World Minimum Volatility Index 5 U.S. government fixed income Barclays U.S. Long Government Bond Index 14 High yield fixed income Barclays U.S. Corporate High Yield 2% Issuer Cap Index 5 Cash Citigroup Three Month U.S. Treasury Bill Index 1 Teradyne’s U.S. Plan invests primarily in common trust funds. Units held in the common trust funds are valued at the unit price as reported by the investment manager based on the asset value of the underlying investments; underlying investments in equity securities are valued at the last reported sales price, and underlying investments in fixed-income securities are generally valued using methods based upon market transactions for comparable securities. During the years ended December 31, 2021 and December 31, 2020, there were no transfers of pension assets in or out of Level 1, Level 2, and Level 3. The fair value of pension plan assets by asset category and by level at December 31, 2021 and December 31, 2020 were as follows: December 31, 2021 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 119,805 $ — $ 119,805 $ — $ — $ — $ — U.S. government securities — 20,847 — 20,847 — — — — Global equity — 7,426 — 7,426 — — — — Other — — — — — 2,017 — 2,017 Cash and cash equivalents 1,500 — — 1,500 — — — — Total $ 1,500 $ 148,078 $ — $ 149,578 $ — $ 2,017 $ — $ 2,017 December 31, 2020 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 127,098 $ — $ 127,098 $ — $ — $ — $ — U.S. government securities — 22,250 — 22,250 — — — — Global equity — 7,925 — 7,925 — — — — Other — — — — — 1,856 — 1,856 Cash and cash equivalents 1,582 — — 1,582 — — — — Total $ 1,582 $ 157,273 $ — $ 158,855 $ — $ 1,856 $ — $ 1,856 Contributions Teradyne’s funding policy is to make contributions to the plans in accordance with local laws and to the extent that such contributions are tax deductible. During 2021, Teradyne contributed $3.3 million to the U.S. supplemental executive defined benefit pension plan and $1.0 million to certain qualified plans for non-U.S. subsidiaries. During 2020, Teradyne contributed $3.1 million to the U.S. supplemental executive defined benefit pension plan and $1.1 million to certain qualified plans for non-U.S. subsidiaries. In 2022, contributions to the U.S. supplemental executive defined benefit pension plan and certain qualified plans from non-U.S. subsidiaries will be approximately $3.3 million and $1.0 million, respectively. Contributions to the U.S. supplemental executive defined benefit pension plan and certain non-U.S. subsidiaries qualified plans will be approximately $6.7 . Expected Future Pension Benefit Payments Future benefit payments are expected to be paid as follows: United States Foreign (in thousands) 2022 $ 9,784 $ 982 2023 9,386 1,268 2024 9,771 1,119 2025 10,333 1,074 2026 10,594 1,192 2027-2030 54,616 8,123 Postretirement Benefit Plans In addition to receiving pension benefits, U.S. Teradyne employees who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes 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. The December 31 balances of the postretirement assets and obligations are shown below: 2021 2020 (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 8,515 $ 9,003 Service cost 64 57 Interest cost 170 240 Actuarial (gain) loss (433 ) 421 Benefits paid (1,107 ) (1,205 ) End of year 7,210 8,515 Change in plan assets: Fair value of plan assets: Beginning of year — — Company contributions 1,107 1,205 Benefits paid (1,107 ) (1,205 ) End of year — — Funded status $ (7,210 ) $ (8,515 ) The following table provides amounts recorded within the account line items of financial position as of December 31: 2021 2020 (in thousands) Accrued employees’ compensation and withholdings $ (930 ) $ (1,161 ) Retirement plans liability (6,280 ) (7,354 ) Funded status $ (7,210 ) $ (8,515 ) The following table provides amounts recognized in accumulated other comprehensive income (loss) as of December 31: 2021 2020 (in thousands) Prior service credit, before tax $ (40 ) $ (49 ) Deferred taxes (1,688 ) (1,686 ) Total recognized in other comprehensive income (loss), net of tax $ (1,728 ) $ (1,735 ) Expense For the years ended December 31, 2021, 2020, and 2019, Teradyne’s net periodic postretirement benefit (income) cost was comprised of the following: 2021 2020 2019 (in thousands) Components of Net Periodic Postretirement Benefit (Income) Cost: Service cost $ 64 $ 57 $ 41 Interest cost 170 240 347 Amortization of prior service credit (9 ) (9 ) (191 ) Net actuarial (gain) loss (433 ) 421 717 Total net periodic postretirement benefit (income) cost (208 ) 709 914 Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: Reversal of amortization items: Prior service credit 9 9 191 Total recognized in net periodic postretirement (income) cost and other comprehensive income $ (199 ) $ 718 $ 1,105 Weighted Average Assumptions to Determine Net Periodic Postretirement Benefit Income as of January 1: 2021 2020 2019 Discount rate 2.2 % 3.0 % 4.0 % Initial health care cost trend rate 7.3 7.1 7.5 Ultimate health care cost trend rate 4.5 4.5 4.5 Year in which ultimate health care cost trend rate is reached 2029 2026 2026 Weighted Average Assumptions to Determine Postretirement Benefit Obligation as of December 31: 2021 2020 2019 Discount rate 2.6 % 2.2 % 3.0 % Initial medical trend 7.3 7.3 7.1 Ultimate health care trend 4.5 4.5 4.5 Medical cost trend rate decrease to ultimate rate in year 2029 2029 2026 Contributions Contributions to the U.S. postretirement benefit plan will be approximately $0.9 million in 2022, $1.4 million in 1 to 3 years, $0.9 million in 3 to 5 years and $1.4 million, thereafter. Expected Future Benefit Payments Future benefit payments are expected to be paid as follows: Benefit Payments (in thousands) 2022 $ 930 2023 774 2024 641 2025 528 2026 419 2027-2030 1,408

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2021
Stock-Based Compensation	Q. STOCK-BASED COMPENSATION Stock Compensation Plans Under Teradyne’s stock compensation plans, Teradyne grants time-based restricted stock units, performance-based restricted stock units, stock options and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”). Service-based restricted stock unit awards granted to employees vest in equal annual installments over four years. Restricted stock unit awards granted to non-employee directors vest after a one Performance-based restricted stock units (“PRSUs”) granted to Teradyne’s executive officers may have a performance metric based on relative total shareholder return (“TSR”). Teradyne’s three-year TSR performance is 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 0% to 200% 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 shorter of the three-year service period or the period from the grant to the date described in the retirement provisions below. Compensation expense for executive officers meeting the retirement provisions prior to the grant date is recognized during the year following the grant. 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. PRSUs granted to Teradyne’s executive officers may also have a performance metric based on three-year cumulative non-GAAP profit before interest and tax (“PBIT”) as a percent of Teradyne’s revenue. Non-GAAP PBIT is a financial measure equal to GAAP income grant. 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 If a PRSU 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 During 2021, 2020 and 2019, Teradyne granted 0.3 million, 0.4 million and 0.8 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $114.16, $71.31, and $37.65, respectively. During 2021, 2020 and 2019, Teradyne granted 0.1 million of service-based restricted stock unit awards to non-employee directors at a weighted average grant date fair value of $128.70, $66.56, and $48.03, respectively. During 2021, 2020 and 2019, Teradyne granted 0.1 million of PBIT PRSUs with a grant date fair value of $113.65, $70.94 and $36.88, respectively. During 2021, 2020 and 2019, Teradyne granted 0.1 million TSR PRSUs, with a grant date fair value of $125.02, $89.93, and $51.51, respectively. The fair value was estimated using the Monte Carlo simulation model with the following assumptions: 2021 2020 2019 Risk-free interest rate 0.2 % 1.5 % 2.6 % Teradyne volatility-historical 43.9 % 34.9 % 31.9 % NYSE Composite Index volatility-historical 22.9 % 11.4 % 11.9 % Dividend yield 0.4 % 0.6 % 1.0 % Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index for each of the 2021, 2020 and 2019 grants 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 each of the grants. Dividend yield was based upon an estimated annual dividend amount of $0.40 per share for 2021, $0.40 per share for 2020 and $0.36 per share for 2019, divided by Teradyne’s stock price on the grant date of $113.48 for the 2021 grants, $72.10 for the 2020 grants and $37.95 for the 2019 grants. During 2021, 2020 and 2019, Teradyne granted 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $36.60, $20.93, and $10.64, respectively. The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions: 2021 2020 2019 Expected life (years) 5.0 5.0 5.0 Risk-free interest rate 0.4 % 1.5 % 2.5 % Volatility-historical 37.8 % 32.0 % 30.1 % Dividend yield 0.4 % 0.5 % 1.0 % Teradyne determined the stock options’ expected life based upon historical exercise data for executive officers, the age of the executive officers and the terms of the stock option grant. Volatility was determined using historical volatility for a period equal to the expected life. The risk-free 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 $0.40 per share divided by Teradyne’s stock price on the grant date of $113.48 for the 2021 grants, $72.61 for the 2020 grants and $37.95 for the 2019 grants. Stock compensation plan activity for the years 2021, 2020, and 2019, is as follows: 2021 2020 2019 (in thousands) Restricted Stock Units: Non-vested at January 1 1,789 2,269 2,454 Awarded 447 616 1,139 Vested (749 ) (1,028 ) (1,237 ) Forfeited (70 ) (68 ) (87 ) Non-vested at December 31 1,417 1,789 2,269 Stock Options: Outstanding at January 1 216 319 506 Granted 34 56 102 Exercised (78 ) (159 ) (280 ) Forfeited (1 ) — (7 ) Expired — — (2 ) Outstanding at December 31 171 216 319 Vested and expected to vest at December 31 171 216 319 Exercisable at December 31 30 27 85 Total shares available for the years 2021, 2020, and 2019: 2021 2020 2019 (in thousands) Shares available: Available for grant at January 1 6,123 6,727 7,874 Options granted (34 ) (56 ) (102 ) Options forfeited 1 — 7 Restricted stock units awarded (447 ) (616 ) (1,139 ) Restricted stock units forfeited 70 68 87 Available for grant at December 31 5,713 6,123 6,727 Weighted average restricted stock unit award date fair value information for the years 2021, 2020, and 2019, is as follows: 2021 2020 2019 Non-vested at January 1 $ 47.84 $ 35.58 $ 29.22 Awarded 115.51 72.76 39.08 Vested 43.99 31.53 23.59 Forfeited 65.52 45.36 35.60 Non-vested at December 31 $ 67.97 $ 47.84 $ 35.58 Restricted stock unit awards aggregate intrinsic value information at December 31 for the years 2021, 2020, and 2019 is as follows: 2021 2020 2019 (in thousands) Vested $ 101,679 $ 71,582 $ 46,110 Outstanding 231,763 214,509 154,752 Expected to vest 231,246 210,301 152,374 Restricted stock units weighted average remaining contractual terms (in years) information at December 31 for the years 2021, 2020, and 2019 is as follows: 2021 2020 2019 Outstanding 0.89 0.96 1.02 Expected to vest 0.89 0.96 1.02 Weighted average stock options exercise price information for the year ended December 31, 2021 is as follows: 2021 Outstanding at January 1 $ 45.59 Options granted 113.48 Options exercised 39.68 Options forfeited — Options cancelled 2.67 Outstanding at December 31 62.13 Exercisable at December 31 34.65 The total cash received from employees as a result of employee stock options exercised during the years ended December 31, 2021, 2020, and 2019, was $3.1 million, $3.8 million, and $3.7 million, respectively. In connection with these exercises, the tax benefit realized by Teradyne for the years ended December 31, 2021, 2020, and 2019, was $0.4 million, $1.5 million, and $2.0 million, respectively. Stock option aggregate intrinsic value information for the years ended December 31, 2021, 2020, and 2019 is as follows: 2021 2020 2019 (in thousands) Exercised $ 6,345 $ 9,682 $ 9,232 Outstanding 17,356 16,083 12,218 Vested and expected to vest 13,500 13,499 7,701 Exercisable 3,856 2,584 4,517 Stock options weighted average remaining contractual terms (in years) information at December 31, for the years 2021, 2020, and 2019 is as follows: 2021 2020 2019 Outstanding 4.4 4.6 4.2 Vested and expected to vest 4.8 4.9 5.0 Exercisable 2.5 2.5 2.1 As of December 31, 2021, total unrecognized expense related to non-vested restricted stock unit awards and stock options was $50.6 million and is expected to be recognized over a weighted average period of 2.4 years. In 2021, 2020 and 2019, Teradyne recognized a discrete tax benefit of $14.7 million, $9.6 million and $4.9 million, respectively, related to net excess tax benefit. On July 17, 2019 (the “Retirement Date”), former Chief Financial Officer Gregory Beecher retired as Vice President and Senior Advisor of Teradyne, and Teradyne entered into an agreement (the “Retirement Agreement”) with Mr. Beecher. Under the Retirement Agreement, Mr. Beecher’s unvested time-based restricted stock units and stock options granted prior to 2019 were modified to allow continued vesting; unvested time-based restricted stock units and stock options granted in 2019 were modified to allow continued vesting through January 31, 2023 (the “Non-Competition pro-rated pro-rated o Non-Competition m. During 2019, Teradyne recorded a stock-based compensation expense of $2.1 million related to the Retirement Agreement. Employee Stock Purchase Plan Under the ESPP, eligible employees may purchase shares of common stock through regular payroll deductions of up to 10% of their compensation, to a maximum of shares with a fair market value of $25,000 per calendar year, not to exceed 6,000 shares. Under the plan, the price paid for the common stock is equal to 85% of the stock price on the last business day of the six-month purchase period. In July 2021, 0.1 million shares of common stock were issued to employees who participated in the plan during the first half of 2021 at the price of $113.87 per share. In January 2022, Teradyne issued 0.1 million shares of common stock to employees who participated in the plan during the second half of 2021 at the price of $139.00 per share. In July 2020, 0.2 million shares of common stock were issued to employees who participated in the plan during the first half of 2020 at the price of $71.83 per share. In January 2021, Teradyne issued 0.1 million shares of common stock to employees who participated in the plan during the second half of 2020 at the price of $101.91 per share. In July 2019, 0.3 million shares of common stock were issued to employees who participated in the plan during the first half of 2019 at the price of $40.72 per share. In January 2020, Teradyne issued 0.2 million shares of common stock to employees who participated in the plan during the second half of 2019 at the price of $57.96 per share. As of December 31, 2021, there were 4.2 million shares available for grant under the ESPP. The following table provides the effect to income from operations for recording stock-based compensation for the years ended December 31, 2021, 2020, and 2019: 2021 2020 2019 (in thousands) Cost of revenues $ 4,196 $ 4,227 $ 3,480 Engineering and development 9,783 12,039 9,913 Selling and administrativ e 31,664 28,640 24,504 Stock-based compensation 45,643 44,906 37,897 Income tax benefit (14,389 ) (13,060 ) (8,360 ) Total stock-based compensation expense after income taxes $ 31,254 $ 31,846 $ 29,537

Savings Plan

Savings Plan	12 Months Ended
	Dec. 31, 2021
Savings Plan	R. SAVINGS PLAN Teradyne sponsors a defined contribution employee retirement savings plan (“Savings Plan”) covering substantially all U.S. employees. Under the Savings Plan, employees may contribute up to 20% of their compensation (subject to Internal Revenue Service limitations). The Savings Plan provides for a discretionary employer match that is determined each year. In 2021, 2020 and 2019, Teradyne matched 100% of eligible employee contributions up to 4% of their compensation for employees not accruing benefits in the U.S. Qualified Pension Plan. There was no match for employees still actively accruing benefits in the U.S. Qualified Pension Plan. Teradyne’s contributions vest 25% per year for the first four years of employment, and contributions for those employees with four years of service vest immediately. In addition, Teradyne sponsors an unfunded U.S. Supplemental Savings Plan to provide savings benefits in excess of those allowed by the Employee Retirement Income Security Act of 1974 and the Internal Revenue Code. The provisions of this plan are the same as the Savings Plan. The liability for the U.S. Supplemental Savings Plan at December 31, 2021 and 2020, was $47.2 million and $38.0 million, respectively, and is included in retirement plan liabilities. Teradyne contributes to defined contributions savings plans for its foreign employees. Under Teradyne’s savings plans, amounts charged to the statements of operations for the years ended December 31, 2021, 2020, and 2019 were $26.9 million, $21.7 million, and $20.9 million, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Taxes	S. INCOME TAXES The components of income before income taxes and the provision (benefit) for income taxes as shown in the consolidated statements of operations were as follows: 2021 2020 2019 (in thousands) Income before income taxes: U.S. $ 403,451 $ 312,153 $ 192,442 Non-U.S. 757,504 588,862 333,330 $ 1,160,955 $ 901,015 $ 525,772 Provision (benefit) for income taxes: Current: U.S. Federal $ 58,218 $ 58,678 $ 19,297 Non-U.S. 105,153 75,193 52,810 State 300 (1,315 ) (4,347 ) 163,671 132,556 67,760 Deferred: U.S. Federal (15,106 ) (12,604 ) (4,522 ) Non-U.S. (4,300 ) (5,127 ) (8,007 ) State 2,101 2,043 3,073 (17,305 ) (15,688 ) (9,456 ) Total provision for income taxes: $ 146,366 $ 116,868 $ 58,304 Income tax expense for 2021, 2020 and 2019 totaled $146.4 million, $116.9 million, and $58.3 million, respectively. The effective tax rate for 2021, 2020 and 2019 was 12.6%, 13.0% and 11.1%, respectively. On December 22, 2017, the U.S. enacted the Tax Cuts and Jobs Act of 2017 (the “Tax Reform Act”), making significant changes to the Internal Revenue Code. The Tax Reform Act has significant direct and indirect implications for accounting for income taxes under ASC 740, “Accounting for Income Taxes” some of which could not be calculated with precision until further clarification and guidance was made available from tax authorities, regulatory bodies or the FASB. In light of this uncertainty, on December 22, 2017 the SEC issued Staff Accounting Bulletin (“SAB”) No. 118, “Income Tax Accounting Implications of the Tax Cuts and Jobs Act,” to address uncertainty in the application of U.S. GAAP when the registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Reform Act. In accordance with SAB 118, Teradyne recorded $186.0 million of additional income tax expense in the fourth quarter of 2017 which represented Teradyne’s best estimate of the impact of the Tax Reform Act in accordance with Teradyne’s understanding of the Tax Reform Act and available guidance as of that date. The $186.0 million was primarily composed of expense of $161.0 million related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings, $33.6 million of expense related to the remeasurement of certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, and a benefit of $10.3 million associated with the impact of correlative adjustments on uncertain tax positions. In accordance with the requirements of SAB 118, in the fourth quarter of 2018, Teradyne completed its analysis of the effect of the Tax Reform Act based on the application of the most recently available guidance as of December 31, 2018 and recorded $49.5 million of net income tax benefit. The net benefit consisted of $51.7 million of benefit resulting from a reduction in the estimate of the one-time transition tax on the mandatory deemed repatriation of foreign earnings and an expense of $2.2 million associated with the impact of correlative adjustments on uncertain tax positions. Teradyne will pay approximately $7.9 million related to the transition tax in 2022, $22.7 million in 1 to 3 years, and $44.3 million in 3 to 5 years. Teradyne has made an accounting policy election to account for global intangible low-taxed On July 27, 2015, in Altera Corp. (“Altera”) v. Commissioner, the U.S. Tax Court issued an opinion invalidating the regulations relating to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision was issued by the Tax Court in December 2015. The IRS appealed the decision in June 2016. On July 24, 2018, the U.S. Court of Appeals for the Ninth Circuit (“Ninth Circuit”) issued a decision that was subsequently withdrawn and a reconstituted panel conferred on the appeal. On June 7, 2019, the Ninth Circuit upheld the cost-sharing regulations. On November 12, 2019 the Ninth Circuit denied Altera’s petition for rehearing of its case. Altera’s application for certiorari to the Supreme Court was declined on June 22, 2020. In the fourth quarter of 2020 and 2021, Teradyne recognized approximately $2.3 million of tax expense and $2.5 million of tax benefit in 2020 and 2021, respectively, related to the inclusion of stock-based compensation in its intercompany cost-sharing arrangement. The decrease in the effective tax rate from 2020 to 2021 is primarily attributable to a decrease in the expense from U.S. global low-taxed The increase in the effective tax rate from 2019 to 2020 is primarily attributable to a reduction in the benefit from releases of reserves for uncertain tax positions, a reduction in benefit from foreign tax credits and an increase in the expense from U.S. global low-taxed A reconciliation of the effective tax rate for the years 2021, 2020 and 2019 is as follows: 2021 2020 2019 U.S. statutory federal tax rate 21.0 % 21.0 % 21.0 % U.S. global intangible low-taxed income 0.6 2.1 1.8 State income taxes, net of federal tax benefit 0.2 0.3 0.5 Foreign taxes (4.5 ) (5.6 ) (4.0 ) U.S. foreign derived intangible income (2.3 ) (2.2 ) (2.6 ) U.S. research and development credit (1.4 ) (1.3 ) (1.8 ) Equity compensation (0.9 ) (0.6 ) (0.7 ) Foreign tax credits (0.5 ) (1.2 ) (1.6 ) Uncertain tax positions (0.4 ) (0.1 ) (4.3 ) U.S. transition tax — — 1.9 Other, net 0.8 0.6 0.9 12.6 % 13.0 % 11.1 % 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 attributable to the Singapore tax holiday for the years ended December 31, 2021, 2020 and 2019 were $33.3 million or $0.18 per diluted share, $29.9 million or $0.16 per diluted share and $15.1 million or $0.08 per diluted share, respectively. In November 2020, Teradyne entered into an agreement with the Singapore Economic Development Board which extended our Singapore tax holiday under substantially similar terms to the agreement which expired on December 31, 2020. The new tax holiday is scheduled to expire on December 31, 2025 . Significant components of Teradyne’s deferred tax assets (liabilities) as of December 31, 2021 and 2020 2021 2020 (in thousands) Deferred tax assets: Tax credits $ 98,378 $ 87,595 Accruals 41,459 33,156 Pension liabilities 28,722 28,348 Inventory valuations 20,991 18,427 Lease liability 16,484 12,627 Deferred revenue 11,164 9,235 Equity compensation 6,630 6,543 Vacation accrual 6,050 5,890 Investment impairment 3,292 3,292 Net operating loss carryforwards 1,721 1,823 Other 774 626 Gross deferred tax assets 235,665 207,562 Less: valuation allowance (97,170 ) (84,962 ) Total deferred tax assets $ 138,495 $ 122,600 Deferred tax liabilities: Right of use assets $ (14,738 ) $ (10,688 ) Depreciation (10,691 ) (14,525 ) Intangible assets (8,531 ) (12,726 ) Contingent consideration (5,214 ) (3,515 ) Marketable securities (3,220 ) (3,344 ) Other — (710 ) Total deferred tax liabilities $ (42,394 ) $ (45,508 ) Net deferred assets $ 96,101 $ 77,092 As of December 31, 2021 and 2020, Teradyne evaluated the likelihood that it would realize deferred income taxes to offset future taxable income and concluded that it is more likely than not that a substantial majority of its deferred tax assets will be realized through consideration of both the positive and negative evidence. At December 31, 2021 and 2020, Teradyne maintained a valuation allowance for certain deferred tax assets of $ 97.0 85 recorded. At December 31, 2021, Teradyne had tax effected operating loss carryforwards that expire in the following years: State Operating Loss Carryforwards Foreign Operating Loss Carryforwards (in thousands) 2022 $ 144 $ 53 2023 208 — 2024 51 — 2025 4 — 2026 — — 2027-2031 361 173 2032-2036 58 13 Beyond 2036 22 — Non-expiring 13 621 Total $ 861 $ 860 Teradyne has approximately $128.9 million of tax credit carryforwards including federal business tax credits of approximately $1.9 million which expire in 2028 through 2031, and state tax credits of $127.1 million, of which $68.7 million do not expire and the remainder expires in the years 2022 through 2041. Teradyne’s gross unrecognize d 2021 2020 2019 (in thousands) Beginning balance as of January 1 $ 17,903 $ 21,180 $ 43,395 Additions: Tax positions for current year 1,417 1,082 1,322 Tax positions for prior years 30 66 8,043 Reductions: Tax positions for prior years (1,639 ) (2,989 ) (31,397 ) Expiration of statutes (3,246 ) (1,436 ) (183 ) Ending balance as of December 31 $ 14,465 $ 17,903 $ 21,180 Current year additions relate to federal and state research credits. Prior year additions relate to state research credits. Prior year reductions are composed of federal reserves related to transfer pricing and research credits which resulted from the expiration of statute for 2017 U.S. federal tax return in the fourth quarter of 2021 and state research credits. Of the $14.5 million of unrecognized tax benefits as of December 31, 2021, $9.5 million would impact the consolidated income tax rate if ultimately recognized. The remaining $4.9 million would impact deferred taxes if recognized. As of December 31, 2021, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $3.0 million in the next twelve months as a result of a lapse of statutes of limitation. The estimated decrease relates to loss carryforwards, research credits and U.S. manufacturing activities deductions. Teradyne records all interest and penalties related to income taxes as a component of income tax expense. Accrued interest and penalties related to income tax items at December 31, 2021 and 2020 amounted to $0.3 million and $1.2 million, respectively. For the years ended December 31, 2021, 2020 and 2019, benefit of $0.9 million, expense of $0.2 million and benefit of $1.1 million, respectively, was recorded for interest and penalties related to income tax items. Teradyne is subject to U.S. federal income tax, as well as income tax in multiple state, local and foreign jurisdictions. As of December 31, 2021, all material state and local income tax matters have been concluded through 2016, all material federal income tax matters have been concluded through 2017 and all material foreign income tax matters have been concluded through 2013. However, in some jurisdictions, including the United States, operating losses and tax credits may be subject to adjustment until such time as they are utilized and the year of utilization is closed to adjustment. As of December 31, 2021, Teradyne is not permanently reinvested with respect to the unremitted earnings of non-U.S. subsidiaries to the extent that those earnings exceed local statutory and operational requirements. Remittance of those earnings is not expected to result in material income tax.

Operating Segment, Geographic a

Operating Segment, Geographic and Significant Customer Information	12 Months Ended
	Dec. 31, 2021
Operating Segment, Geographic and Significant Customer Information	T. OPERATING SEGMENT, GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION Teradyne has four reportable segments (Semiconductor Test, System Test, Wireless Test and Industrial Automation). Each of the reportable segment represents an individual operating segment. On September 15, 2020, Teradyne announced the appointment of Gregory Smith as President of Teradyne’s Industrial Automation reportable segment effective October 1, 2020. With the appointment of Gregory Smith, the Industrial Automation reportable segment is considered one operating segment and one reporting unit. 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 storage and system level test, defense/aerospace instrumentation 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 robotic arms, autonomous mobile robots and advanced robotic control software. Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies.” Segment information for the years ended December 31, 2021, 2020, and 2019 is as follows: Semiconductor Test System Test Industrial Automation Wireless Test Corporate and Other Consolidated (in thousands) 2021 Revenues $ 2,642,342 $ 467,739 $ 375,905 $ 216,895 $ — $ 3,702,881 Income (loss) before taxes (1)(2) 976,988 163,064 (8,167 ) 83,543 (54,473 ) 1,160,955 Total assets (3) 1,245,596 170,954 701,196 107,513 1,584,166 3,809,425 Property additions 115,618 3,905 9,821 3,128 — 132,472 Depreciation and amortization expense 75,982 3,156 27,336 6,055 12,956 125,485 2020 Revenues $ 2,259,597 $ 409,729 $ 279,731 $ 173,016 $ (604 ) $ 3,121,469 Income (loss) before taxes (1)(2) 739,695 152,092 (24,019 ) 41,950 (8,703 ) 901,015 Total assets (3) 1,070,378 138,295 712,936 106,273 1,624,464 3,652,346 Property additions 168,055 3,092 8,899 4,931 — 184,977 Depreciation and amortization expense 64,998 3,426 36,242 6,258 15,819 126,743 2019 Revenues $ 1,552,571 $ 287,455 $ 298,139 $ 157,315 $ (515 ) $ 2,294,965 Income (loss) before taxes (1)(2) 416,973 93,543 (5,916 ) 35,585 (14,413 ) 525,772 Total assets (3) 784,808 131,428 671,559 97,299 1,101,920 2,787,014 Property additions 112,145 3,059 9,076 10,362 — 134,642 Depreciation and amortization expense 59,197 5,518 40,904 5,365 9,671 120,655 (1) Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation. (2) Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges. (3) Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets. Included in each segment are charges and credits in the following line items in the statements of operations: For the Year s 2021 2020 2019 (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ 6,661 $ 11,013 $ 8,731 Contract termination settlement fe e — 4,000 — Restructuring and other—employee severance — — 1,277 System Test: Cost of revenues—inventory charge $ 641 $ 887 $ 2,000 Industrial Automation: Cost of revenues—inventory charge $ 6,403 $ 834 $ 508 Restructuring and other—employee severance 1,210 1,584 796 Restructuring and other—acquisition related expenses and compensation 1,000 985 741 Wireless: Cost of revenues—inventory charge $ 1,770 $ 4,800 $ 4,005 Corporate and Other: Other (income) expense, net—loss on convertible debt conversion $ 28,828 $ — $ — Restructuring and other—other 13,971 — — Restructuring and other—AutoGuide contingent consideration adjustment (7,227 ) (19,724 ) 2,976 Restructuring and other—acquisition related expenses and compensation (513 ) 1,728 1,765 Restructuring and other—MiR contingent consideration adjustment — (3,546 ) (22,199 ) Other (income) expense, net—investment impairment charge — — 15,000 Selling and administrative—equity modification charge — 766 2,108 Information as to Teradyne’s revenues by country is as follows: 2021 2020 2019 (in thousands) Revenues from customers (1): Taiwan $ 1,117,874 $ 1,178,068 $ 485,681 China 631,963 465,722 514,327 Korea 502,167 391,571 239,504 United States 392,626 321,674 333,059 Europe 259,954 205,587 219,015 Philippines 166,838 68,887 54,560 Japan 166,231 143,983 175,322 Thailand 138,812 138,787 87,503 Malaysia 136,774 56,096 58,200 Singapore 121,582 76,460 84,111 Rest of the World 68,060 74,634 43,683 $ 3,702,881 $ 3,121,469 $ 2,294,965 (1) Revenues attributable to a country are based on location of customer site. In 2021 and 2020, revenues from Taiwan Semiconductor Manufacturing Company Ltd., a customer of Teradyne’s Semiconductor Test segment, accounted for 12% and 15%, respectively, of Teradyne’s consolidated revenues. In 2019, no single direct customer accounted for more than 10% of Teradyne’s consolidated revenues. Teradyne estimates consolidated revenues driven by one OEM customer, combining direct sales to that customer with sales to the customer’s OSATs (which include Taiwan Semiconductor Manufacturing Company Ltd.), accounted for approximately 19%, 25% and 10% of its consolidated revenues in 2021, 2020 and 2019, respectively. Teradyne estimates consolidated revenues driven by Huawei Technologies Co., Ltd. (“Huawei”), combining direct sales to that customer with sales to the customer’s OSATs, accounted for approximately %, % and % of its consolidated revenues in and , respectively. Long-lived assets by geographic area: United States Foreign(1) Total (in thousands) December 31, 2021 $ 308,438 $ 147,609 $ 456,047 December 31, 2020 $ 291,234 $ 158,135 $ 449,369 (1) As of December 31, 2021 and 2020, long-lived assets attributable to Singapore were $39.4 million and $62.5 million, respectively.

Stock Repurchase Program

Stock Repurchase Program	12 Months Ended
	Dec. 31, 2021
Stock Repurchase Program	U. STOCK REPURCHASE PROGRAM In January 2021, Teradyne’s Board of Directors cancelled the January 2020 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock. In 2021, Teradyne repurchased 4.8 million shares of common stock for $600.0 million at an average price of $125.74 per share. Teradyne intends to repurchase a minimum of $750.0 million of its common stock in 2022. In January 2020, Teradyne’s Board of Directors cancelled the January 2018 repurchase program and approved a new stock repurchase program for up to $1.0 billion of common stock. On April 1, 2020, Teradyne suspended its share repurchase program. In 2020, Teradyne repurchased 1.5 million shares of common stock for $88.5 million at an average price of $58.33 per share. In 2019, Teradyne repurchased 10.9 million shares of common stock for $500.0 million at an average price per share of $45.89. The cumulative repurchases as of December 31, 2019, for the 2018 stock repurchase program, totaled 32.5 million shares of common stock for $1,323.0 million at an average price per share of $40.68. The total price includes commissions and is recorded as a reduction to retained earnings.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2021
Subsequent Events	V. SUBSEQUENT EVENTS In January 2022, Teradyne’s Board of Directors declared a 10% increase in the quarterly cash dividend to $0.11 per share to be paid on March 18, 2022 to shareholders of record as of February 18, 2022. 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.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2021
Valuation and Qualifying Accounts	TERADYNE, INC. SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS Column A Column B Column C Column D Column E Column F Description Balance at Beginning of Period Additions Charged to Cost and Expenses Other Deductions Balance at End of Period (in thousands) Valuation reserve deducted in the balance sheet from the asset to which it applies: Accounts receivable: 2021 Allowance for doubtful account $ 2,034 $ 500 $ (27 ) $ 495 $ 2,012 2020 Allowance for doubtful account $ 1,736 $ 356 $ 32 $ 90 $ 2,034 2019 Allowance for doubtful account $ 1,673 $ 87 $ 28 $ 52 $ 1,736 Column A Column B Column C Column D Column E Column F Description Balance at Beginning of Period Additions Charged to Cost and Expenses Other Deductions Balance at End of Period (in thousands) Valuation reserve deducted in the balance sheet from the asset to which it applies: Inventory: 2021 Inventory reserve $ 110,587 $ 15,475 $ 1,335 $ 13,342 $ 114,055 2020 Inventory reserve $ 103,556 $ 17,534 $ (521 ) $ 9,982 $ 110,587 2019 Inventory reserve $ 100,779 $ 15,244 $ (85 ) $ 12,382 $ 103,556 Column A Column B Column C Column D Column E Column F Description Balance at Beginning of Period Additions Charged to Cost and Expenses Other Deductions Balance at End of Period (in thousands) Valuation reserve deducted in the balance sheet from the asset to which it applies: Deferred taxes: 2021 Valuation allowance $ 84,962 $ 13,502 $ — $ 1,294 $ 97,170 2020 Valuation allowance $ 77,177 $ 7,785 $ — $ — $ 84,962 2019 Valuation allowance $ 69,852 $ 7,325 $ — $ — $ 77,177

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Basis of Presentation	The consolidated financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions are eliminated. Certain prior years’ amounts were reclassified to conform to the current year presentation.
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 reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, management evaluates its estimates, including those related to inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, contingent consideration liabilities, and loss contingencies. Management bases its estimates on historical experience and on appropriate and customary assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Due to the COVID-19 pandemic, there has been uncertainty and disruption in the global economy and our markets. Management is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of this Annual Report on Form 10-K. These estimates may change, as new events occur and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions.
Revenue Recognition	Revenue Recognition Revenue from Contracts with Customers In accordance with ASC 606, Teradyne recognizes revenues, when or as control is transferred to a customer. Teradyne’s determination of revenue is dependent upon a five-step process outlined below. • Teradyne accounts for a contract with a customer when there is written approval, the contract is committed, the rights of the parties, including payment terms, are identified, the contract has commercial substance and consideration is probable of collection. • Teradyne periodically enters into contracts with customers in which a customer may purchase a combination of goods and services, such as products with extended warranty obligations. Teradyne determines performance obligations by assessing whether the products or services are distinct from the other elements of the contract. In order to be distinct, the product or service must perform either on its own or with readily available resources and must be separate within the context of the contract. • Teradyne determines the transaction price to be the amount of consideration to which Teradyne expects to be entitled to. • Transaction price is allocated to each individual performance obligation based on the standalone selling price of that performance obligation. Teradyne uses standalone transactions when available to value each performance obligation. If standalone transactions are not available, Teradyne will estimate the standalone selling price through market assessments or cost plus a reasonable margin analysis. Any discounts from standalone selling price are spread proportionally to each performance obligation. • In order to determine the appropriate timing for revenue recognition, Teradyne first determines if the transaction meets any of three criteria for over time recognition. If the transaction meets the criteria for over time recognition, Teradyne recognizes revenue as the good or service is delivered. Teradyne uses input variables such as hours or months utilized or costs incurred to determine the amount of revenue to recognize in a given period. Input variables are used as they best align consumption with benefit to the customer. For transactions that do not meet the criteria for over time recognition, Teradyne will recognize revenue at a point in time based on an assessment of the five criteria for transfer of control. Teradyne has concluded that revenue should be recognized when shipped or delivered based on contractual terms. Typically, acceptance of Teradyne’s products and services is a formality as Teradyne delivers similar systems, instruments and robots to standard specifications. In cases where acceptance is not deemed a formality, Teradyne will defer revenue recognition until customer acceptance. Performance Obligations Products Teradyne products consist primarily of semiconductor test systems and instruments, defense/aerospace test instrumentation and systems, storage test systems and instruments, circuit-board test and inspection systems and instruments, wireless test systems and industrial automation products. Teradyne’s hardware is recognized at a point in time upon transfer of control to the customer. Services Teradyne services consist of extended warranties, training and application support, service agreements, post contract customer support (“PCS”) and replacement parts. Each service is recognized based on relative standalone selling price. Extended warranty, training and support, service agreements and PCS are recognized over time based on the period of service. Replacement parts are recognized at a point in time upon transfer of control to the customer. Teradyne does not allow customer returns or provide refunds to customers for any products or services. Teradyne products include a standard 12-month warranty. This warranty is not considered a distinct performance obligation because it does not obligate Teradyne to provide a separate service to the customer and it cannot be purchased separately. Cost related to warranties As of December 31, 2021 and 2020, deferred revenue and customer advances consisted of the following and are included in the short and long-term deferred revenue and customer advances: 2021 2020 (in thousands) Maintenance, service and training $ 81,826 $ 77,654 Extended warranty 64,168 51,929 Customer advances, undelivered elements and other 55,112 63,438 Total deferred revenue and customer advances $ 201,106 $ 193,021
Product Warranty	Product Warranty Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities: Amount (in thousands) Balance at December 31, 2018 $ 7,909 Acquisition 14 Accruals for warranties issued during the period 14,106 Accruals related to pre-existing warranties 4,026 Settlements made during the period (17,059 ) Balance at December 31, 2019 8,996 Accruals for warranties issued during the period 28,490 Accruals related to pre-existing warranties 821 Settlements made during the period (21,674 ) Balance at December 31, 2020 16,633 Accruals for warranties issued during the period 35,727 Accruals related to pre-existing warranties (6,846 ) Settlements made during the period (20,937 ) Balance at December 31, 2021 $ 24,577 When Teradyne receives revenue for extended warranties, beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances: Amount (in thousands) Balance at December 31, 2018 $ 27,422 Deferral of new extended warranty revenue 23,271 Recognition of extended warranty deferred revenue (20,016 ) Balance at December 31, 2019 30,677 Deferral of new extended warranty revenue 41,694 Recognition of extended warranty deferred revenue (20,442 ) Balance at December 31, 2020 51,929 Deferral of new extended warranty revenue 43,597 Recognition of extended warranty deferred revenue (31,358 ) Balance at December 31, 2021 $ 64,168
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Teradyne maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. Estimated allowances for doubtful accounts are reviewed periodically taking into account the customer’s recent payment history, the customer’s current financial statements and other information regarding the customer’s credit worthiness. Account balances are written off against the allowance when it is determined the receivable will not be recovered. Teradyne sells certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. Teradyne accounts for these transactions as sales of receivables and presents cash proceeds as a cash provided by operating activities in the consolidated statements of cash flows. Total trade accounts receivable sold under the factoring agreements were $111.3 million and $131.1 million during 2021 and 2020, respectively. Factoring fees for the sales of receivables are recorded in interest expense and are not material.
Inventories	Inventories Inventories are stated at the lower of cost (first-in, first-out basis) or net realizable value. On a quarterly basis, Teradyne uses consistent methodologies to evaluate all inventories for net realizable value. Teradyne records a provision for both excess and obsolete inventory when such write-downs or write-offs are identified through the quarterly review process. The inventory valuation is based upon assumptions about future demand, product mix and possible alternative uses.
Investments	Investments Teradyne accounts for its investments in debt and equity securities in accordance with the provisions of ASC 320-10, “ Investments—Debt and Equity Securities • 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 twelve months ended December 31, 2021 and 2020. Teradyne measures its debt and equity investments at fair value, in accordance with 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 debt investments are classified as Level 2, and equity investments are classified as Level 1. Acquisition-related contingent consideration is classified as Level 3. Teradyne determines the fair value of acquisition-related contingent consideration using a Monte Carlo simulation model. Assumptions utilized in the model include forecasted revenues, revenue volatility, earnings before interest and taxes, and discount rate.
Financial Assets and Financial Liabilities	Financial Assets and Financial Liabilities Teradyne records changes in fair value of equity securities directly in earnings and realized gains and losses in other (income) expense, net, in accordance with ASU 2016-01, “ Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities
Prepayments	Prepayments Prepayments consist of the following: 2021 2020 (in thousands) Contract manufacturer and supplier prepayments $ 364,478 $ 212,286 Prepaid taxes 15,090 9,361 Prepaid maintenance and other services 13,660 13,116 Other prepayments 13,038 15,329 Total prepayments $ 406,266 $ 250,092
Retirement and Postretirement Plans	Retirement and Postretirement Plans Teradyne recognizes net actuarial gains and losses and the change in the fair value of the plan assets in its operating results in the year in which they occur or upon any interim remeasurement of the plans. Teradyne calculates the expected return on plan assets using the fair value of the plan assets. Actuarial gains and losses are generally measured annually as of December 31 and, accordingly, recorded during the fourth quarter of each year or upon any interim remeasurement of the plans. Teradyne reports net periodic pension cost and net periodic postretirement benefit costs in accordance with ASU 2017-07, “ Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost
Goodwill, Intangible and Long-Lived Assets	Goodwill, Intangible and Long-Lived Assets Teradyne accounts for goodwill and intangible assets in accordance with ASC 350-10, “ Intangibles-Goodwill and Other. In accordance with ASC 350-10, Teradyne has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If Teradyne determines this is the case, Teradyne is required to perform a quantitative goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. If Teradyne determines that it is more likely than not that the fair value of the reporting unit is greater than its carrying amounts, a quantitative goodwill impairment test is not required. In accordance with ASC 360-10, “ Impairment or Disposal of Long-Lived Assets, recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flows analysis. The cash flows estimates used to determine the impairment, if any, contain management’s best estimates using appropriate assumptions and projections at that time.
Business Combination	Business Combination Teradyne recognizes the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. The fair value of identifiable intangible assets is based on detailed cash flows valuations that use information and assumptions provided by management. Teradyne estimates the fair value of contingent consideration at the time of the acquisition using all pertinent information known to us at the time to assess the probability of payment of contingent amounts or through the use of a Monte Carlo simulation model. Teradyne allocates any excess purchase price over the fair value of the net tangible and intangible assets acquired and liabilities assumed to goodwill. The assumptions used in the valuations for our acquisitions may differ materially from actual results depending on performance of the acquired businesses and other factors. While Teradyne believes the assumptions used were appropriate, different assumptions in the valuation of assets acquired and liabilities assumed could have a material impact on the timing and extent of impact on our statements of operations. Goodwill is assigned to reporting units as of the date of the related acquisition.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at cost and depreciated over the estimated useful lives of the assets. Leasehold improvements and major renewals are capitalized and included in property, plant and equipment accounts, while expenditures for maintenance and repairs and minor renewals are charged to expense. When assets are retired, the assets and related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations. Teradyne provides for depreciation of its assets principally on the straight-line method with the cost of the assets being charged to expense over their useful lives as follows: Buildings 40 years Building improvements 5 to 10 years Leasehold improvements Lesser of lease term or 10 years Furniture and fixtures 10 years Test systems manufactured internally 6 years Machinery, equipment and software 3 to 5 years Test systems manufactured internally are used by Teradyne for customer evaluations and manufacturing and support of its customers. Teradyne depreciates the test systems manufactured internally over a six-year life to cost of revenues, engineering and development, and selling and administrative expenses. Teradyne often sells internally manufactured test equipment to customers. Upon the sale of an internally manufactured test system, the net book value of the system is transferred to inventory and expensed as cost of revenues. The net book value of internally manufactured test systems sold in the years ended December 31, 2021, 2020, and 2019 was $16.6 million, $7.3 million, and $5.0 million, respectively.
Convertible Debt	Convertible Debt In accordance with ASC 815-40, 815-40 Teradyne analyzed the Warrant Transactions under ASC 815-40, paid-in The provisions of ASC 470-20, “Debt with Conversion and Other Options,” are applicable to the Notes. ASC 470-20 requires Teradyne to separately account for the liability (debt) and equity (conversion feature) components of the Notes in a manner that reflects Teradyne’s nonconvertible debt borrowing rate at the date of issuance when interest cost is recognized in subsequent periods. Teradyne allocated $ million of the initial $ million principal amount of the Notes to the equity component, which represents a discount to the debt and will be amortized to interest expense using the effective interest method through December 2023. In accounting for the conversions of the Notes pursuant to the terms of the original December 12, 2016 agreement, Teradyne calculated gain or loss on extinguishment equal to the difference between the calculated fair value of the debt immediately prior to its conversion and the carrying amount of the debt component including any unamortized debt discount or issuance costs. The calculated gain or loss is recorded in the consolidated statement of operations. Teradyne determined the conversion value of the conversion transactions by calculating the fair value of debt immediately prior to conversion using an updated remaining expected life of the debt instrument and an updated borrowing rate for a similar debt instrument that does not have an associated convertible feature. In accounting for the conversions of the Notes pursuant to the terms of the original December 12, 2016 agreement, Teradyne calculated gain or loss on extinguishment equal to the difference between the calculated fair value of the debt immediately prior to its conversion and the carrying amount of the debt component including any unamortized debt discount or issuance costs. The calculated gain or loss is recorded in the consolidated statement of operations. Teradyne determined the conversion value of the conversion transactions by calculating the fair value of debt immediately prior to conversion using an updated remaining expected life of the debt instrument and an updated borrowing rate for a similar debt instrument that does not have an associated convertible feature.
Leases	Leases Teradyne adopted Accounting Standards Update (“ASU”) 2016-02, “ Leases (Topic 842) Leases (Topic 842): Targeted Improvements Under ASC 842, a contract is or contains a lease when Teradyne has the right to control the use of an identified asset. Teradyne determines if an arrangement is a lease at inception of the contract, which is the date on which the terms of the contract are agreed to and the agreement creates enforceable rights and obligations. The commencement date of the lease is the date that the lessor makes an underlying asset available for use by Teradyne. As of December 31, 2021, Teradyne does not have material leases that have not yet commenced. Teradyne determines if the lease is an operating or finance lease at the lease commencement date based upon the terms of the lease and the nature of the asset. The lease term used to calculate the lease liability includes options to extend or terminate the lease when it is reasonably certain that the option will be exercised. For leases commencing after January 1, 2019, the lease liability is measured at the present value of future lease payments, discounted using the discount rate for the lease at the commencement date. As Teradyne is typically unable to determine the implicit rate, Teradyne uses an incremental borrowing rate based on the lease term and economic environment at commencement date. Teradyne initially measures payments based on an index by using the applicable rate at lease commencement. Variable payments that do not depend on an index are not included in the lease liability and are recognized as they are incurred. The ROU asset is initially measured as the amount of lease liability, adjusted for any initial lease costs, prepaid lease payments, and reduced by any lease incentives. Teradyne’s contracts often include non-lease non-lease
Engineering and Development Costs	Engineering and Development Costs Teradyne’s products are highly technical in nature and require a large and continuing engineering and development effort. Software development costs incurred prior to the establishment of technological feasibility are charged to expense. Software development costs incurred subsequent to the establishment of technological feasibility are capitalized until the product is available for release to customers. To date, the period between achieving technological feasibility and general availability of the product has been short and software development costs eligible for capitalization have not been material. Engineering and development costs are expensed as incurred and consist primarily of salaries, contractor fees including non-recurring engineering charges related to product design, allocated facility costs, depreciation, and tooling costs.
Stock Compensation Plans and Employee Stock Purchase Plan	Stock Compensation Plans and Employee Stock Purchase Plan Stock-based compensation expense is based on the grant-date fair value estimated in accordance with the provisions of ASC 718-10, “ Compensation-Stock Compensation Excess tax benefits or tax deficiencies are recognized as a discrete tax benefit or discrete tax expense to the current income tax provision in Teradyne’s consolidated statements of operations, all excess tax benefits related to share-based payments are reported as cash flows from operating activities, and all cash payments made to taxing authorities on the employees’ behalf for withheld shares are presented as financing activities on the statement of cash flows.
Income Taxes	Income Taxes Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The measurement of deferred tax assets is reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be realized. Teradyne performed the required assessment of positive and negative evidence regarding the realization of the net deferred tax assets in accordance with ASC 740, “Accounting for Income Taxes.”
Advertising Costs	Advertising Costs Teradyne expenses all advertising costs as incurred. Advertising costs were $13.4 million, $12.8 million and $16.6 million in 2021, 2020 and 2019, respectively.
Translation of Non-U.S. Currencies	Translation of Non-U.S. The functional currency for all non-U.S. non-monetary Net foreign exchange gains and losses resulting from remeasurement are included in other (income) expense, net. For the years ended December 31, 2021, 2020 and 2019, (gains) losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies were $(2.1) million, $2.6 million, and $(1.6) million, respectively. These amounts do not reflect the corresponding (gains) losses from foreign exchange contracts. See Note H: “Financial Instruments” regarding foreign exchange contracts.
Net Income per Common Share	Net Income per Common Share Basic net income per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, diluted net income per common share is calculated by dividing net income by the sum of the weighted average number of common shares plus common stock equivalents, if applicable. With respect to its convertible debt issued in 2016, Teradyne is required to settle the principal of the convertible debt in cash; accordingly, the principal amount is excluded from the determination of diluted earnings per share. As a result, Teradyne is accounting for the conversion spread using the treasury stock method.
Comprehensive Income	Comprehensive Income Comprehensive income includes net income, unrealized pension and postretirement prior service costs and benefits, unrealized gains and losses on investments in debt marketable securities and foreign currency translation adjustment.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Deferred Revenue and Customer Advances	As of December 31, 2021 and 2020, deferred revenue and customer advances consisted of the following and are included in the short and long-term deferred revenue and customer advances: 2021 2020 (in thousands) Maintenance, service and training $ 81,826 $ 77,654 Extended warranty 64,168 51,929 Customer advances, undelivered elements and other 55,112 63,438 Total deferred revenue and customer advances $ 201,106 $ 193,021
Other Accrued Liabilities	Amount (in thousands) Balance at December 31, 2018 $ 7,909 Acquisition 14 Accruals for warranties issued during the period 14,106 Accruals related to pre-existing warranties 4,026 Settlements made during the period (17,059 ) Balance at December 31, 2019 8,996 Accruals for warranties issued during the period 28,490 Accruals related to pre-existing warranties 821 Settlements made during the period (21,674 ) Balance at December 31, 2020 16,633 Accruals for warranties issued during the period 35,727 Accruals related to pre-existing warranties (6,846 ) Settlements made during the period (20,937 ) Balance at December 31, 2021 $ 24,577
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances	Amount (in thousands) Balance at December 31, 2018 $ 27,422 Deferral of new extended warranty revenue 23,271 Recognition of extended warranty deferred revenue (20,016 ) Balance at December 31, 2019 30,677 Deferral of new extended warranty revenue 41,694 Recognition of extended warranty deferred revenue (20,442 ) Balance at December 31, 2020 51,929 Deferral of new extended warranty revenue 43,597 Recognition of extended warranty deferred revenue (31,358 ) Balance at December 31, 2021 $ 64,168
Summary of Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	Prepayments consist of the following: 2021 2020 (in thousands) Contract manufacturer and supplier prepayments $ 364,478 $ 212,286 Prepaid taxes 15,090 9,361 Prepaid maintenance and other services 13,660 13,116 Other prepayments 13,038 15,329 Total prepayments $ 406,266 $ 250,092
Useful Lives of Assets	Teradyne provides for depreciation of its assets principally on the straight-line method with the cost of the assets being charged to expense over their useful lives as follows: Buildings 40 years Building improvements 5 to 10 years Leasehold improvements Lesser of lease term or 10 years Furniture and fixtures 10 years Test systems manufactured internally 6 years Machinery, equipment and software 3 to 5 years

Acquisitions and Investments _2

Acquisitions and Investments in Other Company (Tables)	12 Months Ended
	Dec. 31, 2021
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: December 31, 2019 (in thousands, except per share amount) Revenues $ 2,303,737 Net income $ 464,602 Net income per common share: Basic $ 2.73 Diluted $ 2.59

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition	The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines. Semiconductor Test Industrial Automation Wireless Test Corporate and Other Total System- Memory System Test Universal Mobile AutoGuide (in thousands) For the Year Ended December 31, 2021 (1) Timing of Revenue Recognition Point in Time $ 1,989,979 $ 365,441 $ 409,383 $ 305,512 $ 60,778 $ 106 $ 204,247 $ — $ 3,335,446 Over Time 256,751 30,171 58,356 5,670 2,766 1,073 12,648 — 367,435 Total $ 2,246,730 $ 395,612 $ 467,739 $ 311,182 $ 63,544 $ 1,179 $ 216,895 $ — $ 3,702,881 Geographical Market Asia Pacific $ 2,076,647 $ 381,444 $ 306,812 $ 81,456 $ 12,919 $ — $ 172,103 $ — $ 3,031,381 Americas 102,702 10,665 135,230 94,897 24,890 1,179 36,173 — 405,736 Europe, Middle East and Africa 67,381 3,503 25,697 134,829 25,735 — 8,619 — 265,764 Total $ 2,246,730 $ 395,612 $ 467,739 $ 311,182 $ 63,544 $ 1,179 $ 216,895 $ — $ 3,702,881 For the Year Ended December 31, 2020 (1) Timing of Revenue Recognition Point in Time $ 1,659,414 $ 363,324 $ 348,454 $ 214,212 $ 44,622 $ 10,911 $ 163,834 $ (604 ) $ 2,804,167 Over Time 217,975 18,884 61,275 7,269 211 2,506 9,182 — 317,302 Total $ 1,877,389 $ 382,208 $ 409,729 $ 221,481 $ 44,833 $ 13,417 $ 173,016 $ (604 ) $ 3,121,469 Geographical Market Asia Pacific $ 1,744,593 $ 364,000 $ 258,521 $ 60,277 $ 6,471 $ — $ 143,969 $ — $ 2,577,831 Americas 77,671 12,999 128,482 64,164 16,769 13,417 22,544 (604 ) 335,442 Europe, Middle East and Africa 55,125 5,209 22,726 97,040 21,593 — 6,503 — 208,196 Total $ 1,877,389 $ 382,208 $ 409,729 $ 221,481 $ 44,833 $ 13,417 $ 173,016 $ (604 ) $ 3,121,469 For the Year Ended December 31, 2019 (1) Timing of Revenue Recognition Point in Time $ 1,070,375 $ 247,221 $ 237,686 $ 244,515 $ 44,329 $ 1,144 $ 148,322 $ (515 ) $ 1,993,077 Over Time 216,065 18,910 49,769 7,843 74 234 8,993 — 301,888 Total $ 1,286,440 $ 266,131 $ 287,455 $ 252,358 $ 44,403 $ 1,378 $ 157,315 $ (515 ) $ 2,294,965 Geographical Market Asia Pacific $ 1,152,881 $ 238,714 $ 132,826 $ 68,027 $ 9,513 $ — $ 126,549 $ — $ 1,728,510 Americas 73,257 23,826 129,840 71,926 14,438 1,378 24,234 (515 ) 338,384 Europe, Middle East and Africa 60,302 3,591 24,789 112,405 20,452 — 6,532 — 228,071 Total $ 1,286,440 $ 266,131 $ 287,455 $ 252,358 $ 44,403 $ 1,378 $ 157,315 $ (515 ) $ 2,294,965 (1) Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2021
Composition of Inventories, Net	Inventories, net consisted of the following at December 31, 2021 and 2020: 2021 2020 (in thousands) Raw material s $ 155,641 $ 114,133 Work-in-process 37,740 25,408 Finished goods 49,949 82,648 $ 243,330 $ 222,189

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
Property Plant and Equipment, Net	Property, plant and equipment, net consisted of the following at December 31, 2021 and 2020: 2021 2020 (in thousands) Land $ 17,207 $ 17,207 Buildings 126,468 108,221 Machinery, equipment and software 994,828 956,035 Furniture and fixtures 28,743 28,487 Leasehold improvements 64,110 61,276 Construction in progress 8,105 13,098 1,239,461 1,184,324 Less: accumulated depreciation 852,221 789,524 $ 387,240 $ 394,800

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
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 December 31, 2021 and 2020: December 31, 2021 Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs ( Level Significant Unobservable Inputs (Level 3) Total (in thousands) Assets Cash $ 628,740 $ — $ — $ 628,740 Cash equivalents 412,212 81,247 — 493,459 Available for sale securities: Commercial paper — 189,620 — 189,620 U.S. Treasury securities — 77,789 — 77,789 Corporate debt securities — 56,901 — 56,901 Debt mutual funds 7,971 — — 7,971 U.S. government agency securities — 4,610 — 4,610 Certificates of deposit and time deposits — 1,356 — 1,356 Non-U.S. government securities — 589 — 589 Equity securities: Mutual funds 39,253 — — 39,253 Total $ 1,088,176 $ 412,112 $ — $ 1,500,288 Derivative assets — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Derivative liabilities — 118 — 118 Total $ — $ 118 $ — $ 118 Reported as follows: (Level 1) (Level 2 (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 1,040,952 $ 81,247 $ — $ 1,122,199 Marketable securities — 244,231 — 244,231 Long-term marketable securities 47,224 86,634 — 133,858 Prepayments — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Other current liabilities $ — $ 118 $ — $ 118 Total $ — $ 118 $ — $ 118 December 31, 2020 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 $ 443,166 $ — $ — $ 443,166 Cash equivalents 347,768 123,187 — 470,955 Available for sale securities: U.S. Treasury securities — 258,304 — 258,304 Commercial paper — 254,413 — 254,413 Corporate debt securities — 83,615 — 83,615 Debt mutual funds 8,565 — — 8,565 U.S. government agency securities — 4,339 — 4,339 Certificates of deposit and time deposits — 979 — 979 Non-U.S. government securities — 625 — 625 Equity securities: Mutual funds 29,420 — — 29,420 Total $ 828,919 $ 725,462 $ — $ 1,554,381 Derivative assets — 95 — 95 Total $ 828,919 $ 725,557 $ — $ 1,554,476 Liabilities Contingent consideration $ — $ — $ 7,227 $ 7,227 Derivative liabilities — 504 — 504 Total $ — $ 504 $ 7,227 $ 7,731 (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 790,934 $ 123,187 $ — $ 914,121 Marketable securities — 522,280 — 522,280 Long-term marketable securities 37,985 79,995 — 117,980 Prepayments — 95 — 95 Total $ 828,919 $ 725,557 $ — $ 1,554,476 Liabilities Other current liabilities $ — $ 504 $ — $ 504 Long-term contingent consideration — — 7,227 7,227 Total $ — $ 504 $ 7,227 $ 7,731
Schedule of Changes in Fair Value of Level 3 Contingent Consideration	Changes in the fair value of Level 3 contingent consideration for the years ended December 31, 2021 and 2020 were as follows: Contingent Consideration (in thousands) Balance at December 31, 2019 $ 39,705 Foreign currency impact (355 ) Payments (1) (8,852 ) Fair value adjustment (2) (23,271 ) Balance at December 31, 2020 7,227 Foreign currency impact — Payments — Fair value adjustment (3) (7,227 ) Balance at December 31, 2021 $ — (1) During the year ended December 31, 2020, Teradyne paid $8.9 million of contingent consideration for the earn-out in connection with the acquisition of Mobile Industrial Robots (“MiR”). (2) During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of AutoGuide was decreased by $19.7 million primarily due to a decrease in forecasted revenues and earnings before interest and taxes. During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $3.5 million primarily due to a decrease in forecasted revenues. (3) During the year ended December 31, 2021, the fair value of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide was reduced to zero, which resulted in a benefit of $7.2 million, primarily due to a decrease in forecasted revenues and earnings before interest and taxes. As of December 31, 2021, the maximum amount of contingent consideration that could be paid in connection with the acquisition of AutoGuide is $87.7 million. The remaining earn-out period ends on December 31, 2022. The sellers of AutoGuide have filed an arbitration claim against Teradyne related to allegations of non-compliance with the earn-out obligations.
Schedule of Carrying Amounts and Fair Values of Financial Instruments	The carrying amounts and fair values of Teradyne’s financial instruments at December 31, 2021 and 2020 were as follows: December 31, 2021 December 31, 2020 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 1,122,199 $ 1,122,199 $ 914,121 $ 914,121 Marketable securities 378,089 378,089 640,260 640,260 Derivative assets 92 92 95 95 Liabilities Contingent consideration — — 7,227 7,227 Derivative liabilities 118 118 504 504 Convertible debt (1) 108,426 604,648 410,111 1,739,553 (1) The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion features.
Schedule of Available-for-Sale Marketable Securities	The following tables summarize the composition of available-for-sale December 31, 2021 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Value Fair Market Value of Investments with Unrealized Losses (in thousands) Commercial paper $ 189,614 $ 15 $ (9 ) $ 189,620 $ 22,784 U.S. Treasury securities 77,707 551 (470 ) 77,789 46,435 Corporate debt securities 52,266 4,863 (227 ) 56,901 19,422 Debt mutual funds 7,928 43 — 7,971 — U.S. government agency securities 4,617 5 (12 ) 4,610 3,296 Certificates of deposit and time deposits 1,356 — — 1,356 — Non-U.S. government securities 589 — — 589 — $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 244,213 $ 64 $ (46 ) $ 244,231 $ 54,798 Long-term marketable securities 89,864 5,413 (672 ) 94,605 37,139 $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 December 31, 2020 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Value Fair Market Value of Investments with Unrealized Losses (in thousands) U.S. Treasury securities $ 257,132 $ 1,330 $ (158 ) $ 258,304 $ 17,243 Commercial paper 254,404 10 (1 ) 254,413 12,173 Corporate debt securities 76,129 7,539 (53 ) 83,615 39,896 Debt mutual funds 8,413 152 — 8,565 — U.S. government agency securities 4,294 46 (1 ) 4,339 1,106 Certificates of deposit and time deposits 979 — — 979 — Non-U.S. government securities 625 — — 625 — $ 601,976 $ 9,077 $ (213 ) $ 610,840 $ 70,418 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 522,228 $ 92 $ (40 ) $ 522,280 $ 61,806 Long-term marketable securities 79,748 8,985 (173 ) 88,560 8,612 $ 601,976 $ 9,077 $ (213 ) $ 610,840 $ 70,418
Contractual Maturities of Investments Held	The contractual maturities of investments in available-for-sale marketable securities held at December 31, 2021 were as follows: Cost Fair Value (in thousands) Due within one year $ 244,213 $ 244,231 Due after 1 year through 5 years 41,459 41,377 Due after 5 years through 10 years 6,085 6,434 Due after 10 years 34,392 38,823 Total $ 326,149 $ 330,865
Schedule of Notional Amount of Derivatives	At December 31, 2021 and 2020, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts: December 31, 2021 December 31, 2020 Buy Position Sell Position Net Total Buy Position Sell Position Net Total (in millions) Japanese Yen $ (31.4 ) $ — $ (31.4 ) $ (14.1 ) $ — $ (14.1 ) Taiwan Dollar (35.1 ) — (35.1 ) (27.9 ) — (27.9 ) Korean Won (4.2 ) — (4.2 ) (5.3 ) — (5.3 ) British Pound Sterling (1.8 ) — (1.8 ) (1.0 ) — (1.0 ) Singapore Dollar — 61.9 61.9 — 52.3 52.3 Euro — 44.9 44.9 — 43.9 43.9 Philippine Peso — 3.9 3.9 — 5.0 5.0 Chinese Yuan — 2.8 2.8 — 3.4 3.4 Total $ (72.5 ) $ 113.5 $ 41.0 $ (48.3 ) $ 104.6 $ 56.3
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value	The following table summarizes the fair value of derivative instruments as of December 31, 2021 and 2020: Balance Sheet Location December 31, 2021 December 31, 2020 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Prepayments $ 92 $ 95 Foreign exchange contracts Other current liabilities (118 ) (504 ) Total derivatives $ (26 ) $ (409 )
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized	The following table summarizes the effect of derivative instruments in the statements of operations recognized for the years ended December 31, 2021, 2020, and 2019. Location of Losses Recognized in Statement of Operations December 31, 2021 December 31, 2020 December 31, 2019 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ 6,488 $ 3,515 $ 5,960 (1) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. (2) For the year ended December 31, 2021 net gains from remeasurement of monetary assets and liabilities denominated in foreign currencies were $2.1 million. (3) For the year ended December 31, 2020, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $2.6 million. (4) For the year ended December 31, 2019 net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $1.6 million.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Supplemental cash flow information related to leases	At December 31, 2021, the weighted average remaining lease term and weighted average discount rate for operating leases was 5.3 years and 4.1%, respectively. At December 31, 2020, the weighted average remaining lease term and weighted average discount rate for operating leases was 4.2 years and 4.8%, respectively. Supplemental cash flows information related to leases was as follows: For the Years Ended December 31, December 31, December 31, (in thousands) Cash paid for amounts included in the measurement of lease liabilities included in operating cash flows $ 24,593 $ 24,136 $ 19,400 Right-of-use assets obtained in exchange for new lease obligations 34,246 14,801 26,739
Schedule of operating lease, maturity	Maturities of lease liabilities as of December 31, 2021 were as follows: Operating Lease (in thousands) 2022 $ 22,525 2023 16,187 2024 13,675 2025 10,717 2026 8,553 Thereafter 11,188 Total lease payments 82,845 Less imputed interest (6,690 ) Total lease liabilities $ 76,155

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Components of Convertible Senior Notes	The below tables represent the key components of Teradyne’s convertible senior notes: December 31, December 31, (in thousands) Debt principal $ 116,980 $ 459,971 Unamortized discount 8,554 49,860 Net carrying amount of convertible debt $ 108,426 $ 410,111 Reported as follows: December 31, December 31, (in thousands) Current debt $ 19,182 $ 33,343 Long-term debt 89,244 376,768 Net carrying amount of convertible debt $ 108,426 $ 410,111 For the year s December 31, December 31, (in thousands) Contractual interest expense on the coupon $ 3,009 $ 5,750 Amortization of the discount component and debt issue fees recognized as interest expense 11,019 15,454 Total interest expense on the convertible debt $ 14,028 $ 21,204

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	12 Months Ended
	Dec. 31, 2021
Changes in Accumulated Other Comprehensive (Loss) Income	Changes in accumulated other comprehensive (loss) income, which is presented net of tax, consist of the following: Foreign Currency Translation Adjustment Unrealized Gains Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Balance at December 31, 2019, net of tax of $0, $946, $(1,124), respectively $ (23,514 ) $ 3,480 $ 1,180 $ (18,854 ) Other comprehensive income before reclassifications, net of tax of $0, $1,629, $0, respectively 48,903 5,839 — 54,742 Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(665), $(2), respectively — (2,365 ) (7 ) (2,372 ) Net current period other comprehensive income (loss), net of tax of $0, $964, $(2), respectively 48,903 3,474 (7 ) 52,370 Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126), respectively $ 25,389 $ 6,954 $ 1,173 $ 33,516 Other comprehensive loss before reclassifications, net of tax of $0, $(578), $0, respectively (36,207 ) (2,255 ) — (38,462 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(277), $(2), respectively — (995 ) (7 ) (1,002 ) Net current period other comprehensive loss, net of tax of $0, $(855), $(2), respectively (36,207 ) (3,250 ) (7 ) (39,464 ) Balance at December 31, 2021, net of tax of $0, $1,055, $(1,128), respectively $ (10,818 ) $ 3,704 $ 1,166 $ (5,948 )
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations	Reclassifications out of accumulated other comprehensive (loss) inco m e Details about Accumulated Other Comprehensive (Loss) Income Components For the year s Affected Line Item in the Statements of Operations December 31, 2021 December 31, 2020 December 31, 2019 (in thousands) Available-for-sale marketable securities Unrealized gains, net of tax of $277, $665, $192, respectively $ 995 $ 2,365 $ 690 Interest income Defined benefit pension and postretirement plans: Amortization of prior service benefit, net of tax of $2, $2, $43, respectively 7 7 148 (a) Total reclassifications, net of tax of $279, $667, $235, respectively $ 1,002 $ 2,372 $ 838 Net income (a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note P: “Retirement Plans.”

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the years ended D e Industrial Automation Wireless Test Semiconductor Test System Test Total (in thousands) Balance at December 31, 2019: Goodwill $ 396,483 $ 361,819 $ 261,996 $ 158,699 $ 1,178,997 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) 396,483 7,976 1,456 10,516 416,431 AutoGuide acquisition (149 ) — — — (149 ) Foreign currency translation adjustment 37,418 — 159 — 37,577 Balance at December 31, 2020: Goodwill 433,752 361,819 262,155 158,699 1,216,425 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) 433,752 7,976 1,615 10,516 453,859 Foreign currency translation adjustment (27,781 ) — (54 ) — (27,835 ) Balance at December 31, 2021: Goodwill 405,971 361,819 262,101 158,699 1,188,590 Accumulated impairment losse s — (353,843 ) (260,540 ) (148,183 ) (762,566 ) $ 405,971 $ 7,976 $ 1,561 $ 10,516 $ 426,024
Schedule of Estimated Intangible Assets Amortization Expense	Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2022 $ 20,081 2023 19,592 2024 19,283 2025 11,546 2026 2,423 Thereafter 2,710
Wireless Test
Schedule of Amortizable Intangible Assets	Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets: December 31, 2021 Gross Carrying Amount (1) Accumulated Amortization (1) Foreign Net Carrying Amount (in thousands) Developed technology $ 272,547 $ (223,413 ) $ (4,093 ) $ 45,041 Customer relationships 57,739 (48,921 ) 209 9,027 Tradenames and trademarks 59,387 (37,237 ) (583 ) 21,567 Total intangible assets $ 389,673 $ (309,571 ) $ (4,467 ) $ 75,635 December 31, 2020 Gross Carrying Amount Accumulated Amortization Foreign Net Carrying Amount (in thousands) Developed technology $ 272,547 $ (210,479 ) $ (1,610 ) $ 60,458 Customer relationships 66,239 (54,524 ) 305 12,020 Tradenames and trademarks 70,120 (42,344 ) 685 28,461 Total intangible assets $ 408,906 $ (307,347 ) $ (620 ) $ 100,939 (1) In 2021, $19.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2021
Computation of Basic and Diluted Net Income (Loss) Per Common Share	The following table sets forth the computation of basic and diluted net income per common share: 2021 2020 2019 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 1,014,589 $ 784,147 $ 467,468 Weighted average common shares-basic 164,960 166,120 170,425 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 9,956 6,989 2,698 Incremental shares from assumed conversion of convertible notes (2) 7,435 8,528 4,909 Restricted stock units 1,180 1,264 1,236 Stock options 86 131 178 Employee stock purchase rights 8 10 13 Dilutive potential common shares 18,665 16,922 9,034 Weighted average common shares-diluted 183,625 183,042 179,459 Net income per common share-basic $ 6.15 $ 4.72 $ 2.74 Net income per common share-diluted $ 5.53 $ 4.28 $ 2.60 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.55, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. (2) Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.52, multiplied by 4.4 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations	The December 31 balances of these defined benefit pension plans assets and obligations are shown below: 2021 2020 United States Foreign United States Foreign (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 202,233 $ 50,988 $ 203,791 $ 43,952 Service cost 1,784 941 1,773 907 Interest cost 4,427 337 5,770 516 Actuarial (gain) loss (6,432 ) (2,257 ) 24,671 2,951 Benefits paid (9,337 ) (925 ) (9,844 ) (1,299 ) Retiree annuity purchase — — (24,379 ) — Liability (gain) loss due to settlement (204 ) — 451 — Non-U.S. currency movement — (3,310 ) — 3,961 End of year 192,472 45,774 202,233 50,988 Change in plan assets: Fair value of plan assets: Beginning of year 158,855 1,856 166,932 1,586 Actual return on plan assets (3,217 ) 33 23,048 67 Company contributions 3,276 1,022 3,098 1,079 Benefits paid (9,337 ) (925 ) (9,844 ) (988 ) Retiree annuity purchase — — (24,379 ) — Non-U.S. currency movement — 31 — 112 End of year 149,578 2,017 158,855 1,856 Funded status $ (42,894 ) $ (43,757 ) $ (43,378 ) $ (49,132 )
Amounts Recorded within Statement of Financial Position	The following table provides amounts recorded within the account line items of the statements of financial position as of December 31: 2021 2020 United States Foreign United States Foreign (in thousands) Retirement plans assets $ 15,110 $ — $ 17,468 $ — Accrued employees’ compensation and withholdings (3,288 ) (936 ) (3,273 ) (1,019 ) Retirement plans liabilities (54,716 ) (42,821 ) (57,573 ) (48,113 ) Funded status $ (42,894 ) $ (43,757 ) $ (43,378 ) $ (49,132 )
Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets	Information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31: 2021 2020 United States Foreign United States Foreign (in millions) Projected benefit obligatio n $ 58.0 $ 45.8 $ 60.8 $ 51.0 Accumulated benefit obligation 55.7 42.5 58.5 46.5 Fair value of plan assets — 2.0 — 1.9
Net Periodic Pension and Postretirement Benefit Costs	For the years ended December 31, 2021, 2020, and 2019, Teradyne’s net periodic pension cost (income) was comprised of the following: 2021 2020 2019 United Foreign United Foreign United Foreign (in thousands) Components of Net Periodic Pension Cost (Income): Service cost $ 1,784 $ 941 $ 1,773 $ 907 $ 1,608 $ 751 Interest cost 4,427 337 5,770 516 7,189 691 Expected return on plan assets (3,858 ) (67 ) (4,840 ) (65 ) (6,042 ) (29 ) Net actuarial loss (gain) 643 (2,223 ) 6,463 2,949 2,973 4,485 Settlement (gain) loss (204 ) — 451 — — — Total net periodic pension cost (income) $ 2,792 $ (1,012 ) $ 9,617 $ 4,307 $ 5,728 $ 5,898
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation	Weighted Average Assumptions to Determine Net Periodic Pension Cost at January 1: 2021 2020 2019 United States Foreign United States Foreign United States Foreign Discount rate 2.2 % 0.7 % 2.8 % 1.1 % 4.1 % 1.8 % Expected return on plan assets 2.4 3.5 3.0 3.8 4.3 2.0 Salary progression rate 2.4 2.3 2.6 2.5 2.3 2.5 Weighted Average Assumptions to Determine Pension Obligations at December 31: 2021 2020 United States Foreign United States Foreign Discount rate 2.6 % 1.1 % 2.2 % 0.7 % Salary progression rate 2.4 2.2 2.4 2.3
Weighted Average Pension Asset Allocations by Category	The following table provides weighted average pension asset allocation by asset category at December 31, 2021 and 2020: 2021 2020 United States Foreign United States Foreign Fixed income securities 94.0 % — % 94.0 % — % Equity securities 5.0 — 5.0 — Other 1.0 100.0 1.0 100.0 100.0 % 100.0 % 100.0 % 100.0 %
Target Asset Allocation and Index for Each Asset Category	The target asset allocation and the index for each asset category for the U.S. Plan, per the investment policy, are as follows: Asset Category: Policy Index: Target Allocation U.S. corporate fixed income Barclays U.S. Corporate A or Better Index 75 % Global equity MSCI World Minimum Volatility Index 5 U.S. government fixed income Barclays U.S. Long Government Bond Index 14 High yield fixed income Barclays U.S. Corporate High Yield 2% Issuer Cap Index 5 Cash Citigroup Three Month U.S. Treasury Bill Index 1
Changes in Fair Value of Pension Assets	The fair value of pension plan assets by asset category and by level at December 31, 2021 and December 31, 2020 were as follows: December 31, 2021 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 119,805 $ — $ 119,805 $ — $ — $ — $ — U.S. government securities — 20,847 — 20,847 — — — — Global equity — 7,426 — 7,426 — — — — Other — — — — — 2,017 — 2,017 Cash and cash equivalents 1,500 — — 1,500 — — — — Total $ 1,500 $ 148,078 $ — $ 149,578 $ — $ 2,017 $ — $ 2,017 December 31, 2020 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 127,098 $ — $ 127,098 $ — $ — $ — $ — U.S. government securities — 22,250 — 22,250 — — — — Global equity — 7,925 — 7,925 — — — — Other — — — — — 1,856 — 1,856 Cash and cash equivalents 1,582 — — 1,582 — — — — Total $ 1,582 $ 157,273 $ — $ 158,855 $ — $ 1,856 $ — $ 1,856
Expected Future Benefit Payments	Future benefit payments are expected to be paid as follows: United States Foreign (in thousands) 2022 $ 9,784 $ 982 2023 9,386 1,268 2024 9,771 1,119 2025 10,333 1,074 2026 10,594 1,192 2027-2030 54,616 8,123
Postretirement Benefit Plans
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations	The December 31 balances of the postretirement assets and obligations are shown below: 2021 2020 (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 8,515 $ 9,003 Service cost 64 57 Interest cost 170 240 Actuarial (gain) loss (433 ) 421 Benefits paid (1,107 ) (1,205 ) End of year 7,210 8,515 Change in plan assets: Fair value of plan assets: Beginning of year — — Company contributions 1,107 1,205 Benefits paid (1,107 ) (1,205 ) End of year — — Funded status $ (7,210 ) $ (8,515 )
Amounts Recorded within Statement of Financial Position	The following table provides amounts recorded within the account line items of financial position as of December 31: 2021 2020 (in thousands) Accrued employees’ compensation and withholdings $ (930 ) $ (1,161 ) Retirement plans liability (6,280 ) (7,354 ) Funded status $ (7,210 ) $ (8,515 )
Amounts Recognized in Accumulated Other Comprehensive Income (loss)	The following table provides amounts recognized in accumulated other comprehensive income (loss) as of December 31: 2021 2020 (in thousands) Prior service credit, before tax $ (40 ) $ (49 ) Deferred taxes (1,688 ) (1,686 ) Total recognized in other comprehensive income (loss), net of tax $ (1,728 ) $ (1,735 )
Net Periodic Pension and Postretirement Benefit Costs	For the years ended December 31, 2021, 2020, and 2019, Teradyne’s net periodic postretirement benefit (income) cost was comprised of the following: 2021 2020 2019 (in thousands) Components of Net Periodic Postretirement Benefit (Income) Cost: Service cost $ 64 $ 57 $ 41 Interest cost 170 240 347 Amortization of prior service credit (9 ) (9 ) (191 ) Net actuarial (gain) loss (433 ) 421 717 Total net periodic postretirement benefit (income) cost (208 ) 709 914 Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: Reversal of amortization items: Prior service credit 9 9 191 Total recognized in net periodic postretirement (income) cost and other comprehensive income $ (199 ) $ 718 $ 1,105
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation	Weighted Average Assumptions to Determine Net Periodic Postretirement Benefit Income as of January 1: 2021 2020 2019 Discount rate 2.2 % 3.0 % 4.0 % Initial health care cost trend rate 7.3 7.1 7.5 Ultimate health care cost trend rate 4.5 4.5 4.5 Year in which ultimate health care cost trend rate is reached 2029 2026 2026 Weighted Average Assumptions to Determine Postretirement Benefit Obligation as of December 31: 2021 2020 2019 Discount rate 2.6 % 2.2 % 3.0 % Initial medical trend 7.3 7.3 7.1 Ultimate health care trend 4.5 4.5 4.5 Medical cost trend rate decrease to ultimate rate in year 2029 2029 2026
Expected Future Benefit Payments	Expected Future Benefit Payments Future benefit payments are expected to be paid as follows: Benefit Payments (in thousands) 2022 $ 930 2023 774 2024 641 2025 528 2026 419 2027-2030 1,408

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2021
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: 2021 2020 2019 Risk-free interest rate 0.2 % 1.5 % 2.6 % Teradyne volatility-historical 43.9 % 34.9 % 31.9 % NYSE Composite Index volatility-historical 22.9 % 11.4 % 11.9 % Dividend yield 0.4 % 0.6 % 1.0 %
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: 2021 2020 2019 Expected life (years) 5.0 5.0 5.0 Risk-free interest rate 0.4 % 1.5 % 2.5 % Volatility-historical 37.8 % 32.0 % 30.1 % Dividend yield 0.4 % 0.5 % 1.0 %
Stock Compensation Plan Activity	Stock compensation plan activity for the years 2021, 2020, and 2019, is as follows: 2021 2020 2019 (in thousands) Restricted Stock Units: Non-vested at January 1 1,789 2,269 2,454 Awarded 447 616 1,139 Vested (749 ) (1,028 ) (1,237 ) Forfeited (70 ) (68 ) (87 ) Non-vested at December 31 1,417 1,789 2,269 Stock Options: Outstanding at January 1 216 319 506 Granted 34 56 102 Exercised (78 ) (159 ) (280 ) Forfeited (1 ) — (7 ) Expired — — (2 ) Outstanding at December 31 171 216 319 Vested and expected to vest at December 31 171 216 319 Exercisable at December 31 30 27 85
Share Based Compensation Total Shares Available	Total shares available for the years 2021, 2020, and 2019: 2021 2020 2019 (in thousands) Shares available: Available for grant at January 1 6,123 6,727 7,874 Options granted (34 ) (56 ) (102 ) Options forfeited 1 — 7 Restricted stock units awarded (447 ) (616 ) (1,139 ) Restricted stock units forfeited 70 68 87 Available for grant at December 31 5,713 6,123 6,727
Weighted-Average Restricted Stock Unit Award Date Fair Value	Weighted average restricted stock unit award date fair value information for the years 2021, 2020, and 2019, is as follows: 2021 2020 2019 Non-vested at January 1 $ 47.84 $ 35.58 $ 29.22 Awarded 115.51 72.76 39.08 Vested 43.99 31.53 23.59 Forfeited 65.52 45.36 35.60 Non-vested at December 31 $ 67.97 $ 47.84 $ 35.58
Restricted Stock Unit Awards Aggregate Intrinsic Value	Restricted stock unit awards aggregate intrinsic value information at December 31 for the years 2021, 2020, and 2019 is as follows: 2021 2020 2019 (in thousands) Vested $ 101,679 $ 71,582 $ 46,110 Outstanding 231,763 214,509 154,752 Expected to vest 231,246 210,301 152,374
Restricted Stock Units Weighted Average Remaining Contractual Terms	Restricted stock units weighted average remaining contractual terms (in years) information at December 31 for the years 2021, 2020, and 2019 is as follows: 2021 2020 2019 Outstanding 0.89 0.96 1.02 Expected to vest 0.89 0.96 1.02
Weighted Average Stock Options Exercise Price	Weighted average stock options exercise price information for the year ended December 31, 2021 is as follows: 2021 Outstanding at January 1 $ 45.59 Options granted 113.48 Options exercised 39.68 Options forfeited — Options cancelled 2.67 Outstanding at December 31 62.13 Exercisable at December 31 34.65
Stock Option Aggregate Intrinsic Value Information	Stock option aggregate intrinsic value information for the years ended December 31, 2021, 2020, and 2019 is as follows: 2021 2020 2019 (in thousands) Exercised $ 6,345 $ 9,682 $ 9,232 Outstanding 17,356 16,083 12,218 Vested and expected to vest 13,500 13,499 7,701 Exercisable 3,856 2,584 4,517
Stock Options Weighted Average Remaining Contractual Terms	Stock options weighted average remaining contractual terms (in years) information at December 31, for the years 2021, 2020, and 2019 is as follows: 2021 2020 2019 Outstanding 4.4 4.6 4.2 Vested and expected to vest 4.8 4.9 5.0 Exercisable 2.5 2.5 2.1
Effect to Income (Loss) from Operations for Recording Stock-Based Compensation	The following table provides the effect to income from operations for recording stock-based compensation for the years ended December 31, 2021, 2020, and 2019: 2021 2020 2019 (in thousands) Cost of revenues $ 4,196 $ 4,227 $ 3,480 Engineering and development 9,783 12,039 9,913 Selling and administrativ e 31,664 28,640 24,504 Stock-based compensation 45,643 44,906 37,897 Income tax benefit (14,389 ) (13,060 ) (8,360 ) Total stock-based compensation expense after income taxes $ 31,254 $ 31,846 $ 29,537

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule of Income (Loss) Before Income Taxes and Provision (Benefit) for Income Taxes from Operations	The components of income before income taxes and the provision (benefit) for income taxes as shown in the consolidated statements of operations were as follows: 2021 2020 2019 (in thousands) Income before income taxes: U.S. $ 403,451 $ 312,153 $ 192,442 Non-U.S. 757,504 588,862 333,330 $ 1,160,955 $ 901,015 $ 525,772 Provision (benefit) for income taxes: Current: U.S. Federal $ 58,218 $ 58,678 $ 19,297 Non-U.S. 105,153 75,193 52,810 State 300 (1,315 ) (4,347 ) 163,671 132,556 67,760 Deferred: U.S. Federal (15,106 ) (12,604 ) (4,522 ) Non-U.S. (4,300 ) (5,127 ) (8,007 ) State 2,101 2,043 3,073 (17,305 ) (15,688 ) (9,456 ) Total provision for income taxes: $ 146,366 $ 116,868 $ 58,304
Reconciliation of Effective Tax Rate	A reconciliation of the effective tax rate for the years 2021, 2020 and 2019 is as follows: 2021 2020 2019 U.S. statutory federal tax rate 21.0 % 21.0 % 21.0 % U.S. global intangible low-taxed income 0.6 2.1 1.8 State income taxes, net of federal tax benefit 0.2 0.3 0.5 Foreign taxes (4.5 ) (5.6 ) (4.0 ) U.S. foreign derived intangible income (2.3 ) (2.2 ) (2.6 ) U.S. research and development credit (1.4 ) (1.3 ) (1.8 ) Equity compensation (0.9 ) (0.6 ) (0.7 ) Foreign tax credits (0.5 ) (1.2 ) (1.6 ) Uncertain tax positions (0.4 ) (0.1 ) (4.3 ) U.S. transition tax — — 1.9 Other, net 0.8 0.6 0.9 12.6 % 13.0 % 11.1 %
Deferred Tax Assets (Liabilities)	Significant components of Teradyne’s deferred tax assets (liabilities) as of December 31, 2021 and 2020 2021 2020 (in thousands) Deferred tax assets: Tax credits $ 98,378 $ 87,595 Accruals 41,459 33,156 Pension liabilities 28,722 28,348 Inventory valuations 20,991 18,427 Lease liability 16,484 12,627 Deferred revenue 11,164 9,235 Equity compensation 6,630 6,543 Vacation accrual 6,050 5,890 Investment impairment 3,292 3,292 Net operating loss carryforwards 1,721 1,823 Other 774 626 Gross deferred tax assets 235,665 207,562 Less: valuation allowance (97,170 ) (84,962 ) Total deferred tax assets $ 138,495 $ 122,600 Deferred tax liabilities: Right of use assets $ (14,738 ) $ (10,688 ) Depreciation (10,691 ) (14,525 ) Intangible assets (8,531 ) (12,726 ) Contingent consideration (5,214 ) (3,515 ) Marketable securities (3,220 ) (3,344 ) Other — (710 ) Total deferred tax liabilities $ (42,394 ) $ (45,508 ) Net deferred assets $ 96,101 $ 77,092
Operating Loss Carryforwards	At December 31, 2021, Teradyne had tax effected operating loss carryforwards that expire in the following years: State Operating Loss Carryforwards Foreign Operating Loss Carryforwards (in thousands) 2022 $ 144 $ 53 2023 208 — 2024 51 — 2025 4 — 2026 — — 2027-2031 361 173 2032-2036 58 13 Beyond 2036 22 — Non-expiring 13 621 Total $ 861 $ 860
Unrecognized Tax Benefits	Teradyne’s gross unrecognize d 2021 2020 2019 (in thousands) Beginning balance as of January 1 $ 17,903 $ 21,180 $ 43,395 Additions: Tax positions for current year 1,417 1,082 1,322 Tax positions for prior years 30 66 8,043 Reductions: Tax positions for prior years (1,639 ) (2,989 ) (31,397 ) Expiration of statutes (3,246 ) (1,436 ) (183 ) Ending balance as of December 31 $ 14,465 $ 17,903 $ 21,180

Operating Segment, Geographic_2

Operating Segment, Geographic and Significant Customer Information (Tables)	12 Months Ended
	Dec. 31, 2021
Segment Information	Segment information for the years ended December 31, 2021, 2020, and 2019 is as follows: Semiconductor Test System Test Industrial Automation Wireless Test Corporate and Other Consolidated (in thousands) 2021 Revenues $ 2,642,342 $ 467,739 $ 375,905 $ 216,895 $ — $ 3,702,881 Income (loss) before taxes (1)(2) 976,988 163,064 (8,167 ) 83,543 (54,473 ) 1,160,955 Total assets (3) 1,245,596 170,954 701,196 107,513 1,584,166 3,809,425 Property additions 115,618 3,905 9,821 3,128 — 132,472 Depreciation and amortization expense 75,982 3,156 27,336 6,055 12,956 125,485 2020 Revenues $ 2,259,597 $ 409,729 $ 279,731 $ 173,016 $ (604 ) $ 3,121,469 Income (loss) before taxes (1)(2) 739,695 152,092 (24,019 ) 41,950 (8,703 ) 901,015 Total assets (3) 1,070,378 138,295 712,936 106,273 1,624,464 3,652,346 Property additions 168,055 3,092 8,899 4,931 — 184,977 Depreciation and amortization expense 64,998 3,426 36,242 6,258 15,819 126,743 2019 Revenues $ 1,552,571 $ 287,455 $ 298,139 $ 157,315 $ (515 ) $ 2,294,965 Income (loss) before taxes (1)(2) 416,973 93,543 (5,916 ) 35,585 (14,413 ) 525,772 Total assets (3) 784,808 131,428 671,559 97,299 1,101,920 2,787,014 Property additions 112,145 3,059 9,076 10,362 — 134,642 Depreciation and amortization expense 59,197 5,518 40,904 5,365 9,671 120,655 (1) Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation. (2) Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges. (3) Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.
Schedule of Segment Reporting Information by Segment Charges	Included in each segment are charges and credits in the following line items in the statements of operations: For the Year s 2021 2020 2019 (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ 6,661 $ 11,013 $ 8,731 Contract termination settlement fe e — 4,000 — Restructuring and other—employee severance — — 1,277 System Test: Cost of revenues—inventory charge $ 641 $ 887 $ 2,000 Industrial Automation: Cost of revenues—inventory charge $ 6,403 $ 834 $ 508 Restructuring and other—employee severance 1,210 1,584 796 Restructuring and other—acquisition related expenses and compensation 1,000 985 741 Wireless: Cost of revenues—inventory charge $ 1,770 $ 4,800 $ 4,005 Corporate and Other: Other (income) expense, net—loss on convertible debt conversion $ 28,828 $ — $ — Restructuring and other—other 13,971 — — Restructuring and other—AutoGuide contingent consideration adjustment (7,227 ) (19,724 ) 2,976 Restructuring and other—acquisition related expenses and compensation (513 ) 1,728 1,765 Restructuring and other—MiR contingent consideration adjustment — (3,546 ) (22,199 ) Other (income) expense, net—investment impairment charge — — 15,000 Selling and administrative—equity modification charge — 766 2,108
Revenues by Country	Information as to Teradyne’s revenues by country is as follows: 2021 2020 2019 (in thousands) Revenues from customers (1): Taiwan $ 1,117,874 $ 1,178,068 $ 485,681 China 631,963 465,722 514,327 Korea 502,167 391,571 239,504 United States 392,626 321,674 333,059 Europe 259,954 205,587 219,015 Philippines 166,838 68,887 54,560 Japan 166,231 143,983 175,322 Thailand 138,812 138,787 87,503 Malaysia 136,774 56,096 58,200 Singapore 121,582 76,460 84,111 Rest of the World 68,060 74,634 43,683 $ 3,702,881 $ 3,121,469 $ 2,294,965 (1) Revenues attributable to a country are based on location of customer site.
Long-Lived Assets by Geographic Area	Long-lived assets by geographic area: United States Foreign(1) Total (in thousands) December 31, 2021 $ 308,438 $ 147,609 $ 456,047 December 31, 2020 $ 291,234 $ 158,135 $ 449,369 (1) As of December 31, 2021 and 2020, long-lived assets attributable to Singapore were $39.4 million and $62.5 million, respectively.

The Company - Additional inform

The Company - Additional information (Detail)	Nov. 13, 2019USD ($)	Jan. 30, 2019USD ($)	Oct. 03, 2021USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jul. 01, 2021USD ($)	Jun. 01, 2021USD ($)	Feb. 28, 2020USD ($)	Jun. 03, 2019USD ($)
Business Acquisition [Line Items]
Contingent consideration	$ 24,000,000
Investment impairment				$ 0	$ 0	$ 15,000,000
MachinemetricsInc [Member]
Business Acquisition [Line Items]
Long-term Investments			$ 12,000,000	12,000,000			$ 12,000,000			$ 15,000,000
Unrealized Gain (Loss) on Investments			$ 0	0
Industrial Automation
Business Acquisition [Line Items]
Total preliminary purchase price	81,600,000
Real War In [Member]
Business Acquisition [Line Items]
Equity Method Investments						$ 0		$ 12,000,000		$ 15,000,000
Repaymentof debt demanded									$ 25,000,000
Lemsys [Member]
Business Acquisition [Line Items]
Total preliminary purchase price		$ 9,100,000
Autoguide LLC
Business Acquisition [Line Items]
Arrangement range of outcomes value high	87,700,000
Autoguide LLC | Industrial Automation
Business Acquisition [Line Items]
Cash paid to acquire outstanding common and preferred stock	57,600,000
Contingent consideration	$ 24,000,000
Business acquisition percentage of equity	100.00%
Arrangement range of outcomes value high				$ 87,700,000
Quantity of material to be transported	4,500

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 03, 2021
Summary Of Significant Accounting Policies [Line Items]
Standard warranty period	12 months
Depreciation over life to cost of revenues and selling and administrative expenses, years	6 years
Net book value of internally manufactured test systems sold	$ 16,600	$ 7,300	$ 5,000
Advertising costs	13,400	12,800	16,600
Losses (gains) on foreign currency transactions	2,100	2,600	$ 1,600
Trade Accounts Receivable	111,300	131,100
Debt Instrument, Face Amount	$ 116,980	459,971
OnePointTwoFivePercentConvertibleSeniorUnsecuredNotesDueDecemberFifteenTwoThousandTwentyThree [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component				$ 100,800
Debt Instrument, Face Amount		$ 460,000

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Arrangement
Maintenance, service and training	$ 81,826	$ 77,654
Customer advances, undelivered elements and other	55,112	63,438
Extended warranty	64,168	51,929	$ 30,677	$ 27,422
Total deferred revenue and customer advances	$ 201,106	$ 193,021

Warranty Accrual Included in Ot

Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 16,633	$ 8,996	$ 7,909
Acquisition			14
Accruals for warranties issued during the period	35,727	28,490	14,106
Accruals related to pre-existing warranties	(6,846)	821	4,026
Settlements made during the period	(20,937)	(21,674)	(17,059)
Balance at end of period	$ 24,577	$ 16,633	$ 8,996

Extended Product Warranty of Sh

Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 51,929	$ 30,677	$ 27,422
Deferral of new extended warranty revenue	43,597	41,694	23,271
Recognition of extended warranty deferred revenue	(31,358)	(20,442)	(20,016)
Balance at end of period	$ 64,168	$ 51,929	$ 30,677

Schedule of Prepayments and Oth

Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments	$ 364,478	$ 212,286
Prepaid taxes	15,090	9,361
Prepaid maintenance and other services	13,660	13,116
Other prepayments	13,038	15,329
Total prepayments	$ 406,266	$ 250,092

Useful Lives of Assets (Detail)

Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2021
Buildings
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	40 months
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	5 months
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	10 months
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Useful lives, description	Lesser of lease term or 10 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	10 months
Test Systems Manufactured Internally
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	6 months
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	3 months
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	5 months

Recently Issued Accounting Pr_2

Recently Issued Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	Dec. 12, 2016	Jan. 01, 2022	Dec. 31, 2021	Nov. 04, 2021	Dec. 31, 2020
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS [Line Items]
Debt instrument, interest rate, stated percentage				1.25%
Current debt			$ 19,182		$ 33,343
Debt			89,244		376,768
Increase (decrease) in adoption of new accounting guidance amount			736,566		387,414
Additional paid-in capital			$ 1,811,545		$ 1,765,323
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Accounting Standards Update 2020-06 [Member] | Subsequent Event [Member]
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS [Line Items]
Current debt		$ 1,500
Debt		6,500
Increase (decrease) in adoption of new accounting guidance amount		92,800
Additional paid-in capital		$ 100,800
TEROnePointTwoFivePercentConvertibleSeniorUnsecuredNotesDueDecemberFifteenTwoThousandTwentyThree [Member]
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS [Line Items]
Senior notes maturity date	Dec. 15, 2023

Acquisitions and Investments _3

Acquisitions and Investments in Other Company - Additional Information (Detail)

Nov. 13, 2019USD ($)

Jan. 30, 2019USD ($)

Jan. 30, 2019USD ($)

Dec. 31, 2019USD ($)

Oct. 03, 2021USD ($)

Dec. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Jul. 01, 2021USD ($)

Jun. 01, 2021USD ($)

Feb. 28, 2020USD ($)

Jun. 03, 2019USD ($)

Business Acquisition [Line Items]

Contingent consideration

$ 24,000,000

Investment impairment

$ 0

$ 0

$ 15,000,000

MachinemetricsInc [Member]

Business Acquisition [Line Items]

Long-term Investments

$ 12,000,000

12,000,000

$ 12,000,000

$ 15,000,000

Unrealized Gain (Loss) on Investments

$ 0

0

Industrial Automation [Member]

Business Acquisition [Line Items]

Total preliminary purchase price

81,600,000

Estimate of Fair Value Measurement [Member]

Business Acquisition [Line Items]

Contingent consideration

0

$ 7,227,000

Real War In [Member]

Business Acquisition [Line Items]

Equity Method Investments

$ 0

0

$ 12,000,000

$ 15,000,000

Repaymentof debt demanded

$ 25,000,000

Lemsys [Member]

Business Acquisition [Line Items]

Total preliminary purchase price

$ 1,400,000

$ 1,400,000

Total preliminary purchase price

9,100,000

Acquired value of intangible assets

$ 4,600,000

4,600,000

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

5 years 2 months 12 days

Net tangible assets

$ 3,100,000

$ 3,100,000

Autoguide LLC [Member]

Business Acquisition [Line Items]

Arrangement range of outcomes value high

87,700,000

Revenues

1,400,000

Income (loss) before income taxes

$ (900,000)

Autoguide LLC [Member] | Industrial Automation [Member]

Business Acquisition [Line Items]

Total preliminary purchase price

81,600,000

Cash paid to acquire outstanding common and preferred stock

57,600,000

Contingent consideration

$ 24,000,000

Arrangement range of outcomes value high

$ 87,700,000

Quantity of material to be transported

4,500

Business acquisition percentage of equity

100.00%

Autoguide LLC [Member] | Estimate of Fair Value Measurement [Member]

Business Acquisition [Line Items]

Revenues

100,000

Autoguide LLC [Member] | Acquisition Related Costs

Business Acquisition [Line Items]

Net income

$ 1,200,000

Pro Forma Results Under Acquisi

Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / shares
Business Acquisition [Line Items]
Revenue | $	$ 2,303,737
Net income | $	$ 464,602
Net income per common share, basic | $ / shares	$ 2.73
Net income per common share, diluted | $ / shares	$ 2.59

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Revenue And Customer Advances	$ 102.5	$ 91	$ 65.6
Revenue, Remaining Performance Obligation, Amount	$ 1,306
Short-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	92.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	12 months
Long-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	8.00%
Long-term Contract with Customer [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	3 years
Long-term Contract with Customer [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	1 year

Disaggregated Revenue by Primar

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total	[1],[2]	$ 3,702,881	$ 3,121,469	$ 2,294,965
Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		2,642,342	2,259,597	1,552,571
System Test
Disaggregation of Revenue [Line Items]
Total	[1]	467,739	409,729	287,455
Industrial Automation
Disaggregation of Revenue [Line Items]
Total		375,905	279,731	298,139
Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	216,895	173,016	157,315
Corporate and Other
Disaggregation of Revenue [Line Items]
Total	[1]		(604)	(515)
Point in Time
Disaggregation of Revenue [Line Items]
Total	[1]	3,335,446	2,804,167	1,993,077
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	409,383	348,454	237,686
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	204,247	163,834	148,322
Point in Time | Corporate and Other
Disaggregation of Revenue [Line Items]
Total	[1]		(604)	(515)
Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	367,435	317,302	301,888
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	58,356	61,275	49,769
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	12,648	9,182	8,993
Americas
Disaggregation of Revenue [Line Items]
Total	[1]	405,736	335,442	338,384
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	135,230	128,482	129,840
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	36,173	22,544	24,234
Americas | Corporate and Other
Disaggregation of Revenue [Line Items]
Total	[1]		(604)	(515)
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	265,764	208,196	228,071
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	25,697	22,726	24,789
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	8,619	6,503	6,532
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	3,031,381	2,577,831	1,728,510
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	306,812	258,521	132,826
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	172,103	143,969	126,549
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	2,246,730	1,877,389	1,286,440
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,989,979	1,659,414	1,070,375
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	256,751	217,975	216,065
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	102,702	77,671	73,257
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	67,381	55,125	60,302
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	2,076,647	1,744,593	1,152,881
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	395,612	382,208	266,131
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	365,441	363,324	247,221
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	30,171	18,884	18,910
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	10,665	12,999	23,826
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	3,503	5,209	3,591
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	381,444	364,000	238,714
Universal Robots (UR) | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	311,182	221,481	252,358
Universal Robots (UR) | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	305,512	214,212	244,515
Universal Robots (UR) | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	5,670	7,269	7,843
Universal Robots (UR) | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	94,897	64,164	71,926
Universal Robots (UR) | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	134,829	97,040	112,405
Universal Robots (UR) | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	81,456	60,277	68,027
MiR | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	63,544	44,833	44,403
MiR | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	60,778	44,622	44,329
MiR | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	2,766	211	74
MiR | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	24,890	16,769	14,438
MiR | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	25,735	21,593	20,452
MiR | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	12,919	6,471	9,513
Autoguide LLC [Member] | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	1,179	13,417	1,378
Autoguide LLC [Member] | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	106	10,911	1,144
Autoguide LLC [Member] | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	1,073	2,506	234
Autoguide LLC [Member] | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	$ 1,179	$ 13,417	$ 1,378
[1]	Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2]	Revenues attributable to a country are based on location of customer site.

Disaggregated Revenue by Prim_2

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Revenue on leases	$ 13.2	$ 10	$ 8.4

Composition of Inventories, Net

Composition of Inventories, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 155,641	$ 114,133
Work-in-process	37,740	25,408
Finished goods	49,949	82,648
Inventories, net	$ 243,330	$ 222,189

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Inventory reserves	$ 114.1	$ 110.6

Property Plant and Equipment, N

Property Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Land	$ 17,207	$ 17,207
Buildings	126,468	108,221
Machinery, equipment and software	994,828	956,035
Furniture and fixtures	28,743	28,487
Leasehold improvements	64,110	61,276
Construction in progress	8,105	13,098
Property, Plant and Equipment, Gross, Total	1,239,461	1,184,324
Less: accumulated depreciation	852,221	789,524
Property, plant and equipment, net	$ 387,240	$ 394,800

Property, Plant and Equipment -

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation of property, plant and equipment	$ 91,073	$ 80,119	$ 70,834
Machinery and equipment	994,828	956,035
Accumulated depreciation	852,221	789,524
Test Systems Leased By Customers
Property, Plant and Equipment [Line Items]
Machinery and equipment	13,400	23,400
Accumulated depreciation	$ 8,700	$ 7,500

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain	$ 3.1	$ 4.6	$ 1.3
Available-for-sale securities, realized loss	0	0.3	0.2
Aggregate loss of investments with unrealized losses greater than one year	6.5
Aggregate loss of investments with unrealized losses less than one year	85.4	70.4
Unrealized Gain (loss) on contracts	2.1	2.6	$ 1.6
Equity securities unrealized gain	5.1	9.6
Equity securities unrealized loss	$ 1.8	$ 6
Accounts Receivable | Customer 1 | Minimum
Financial Instruments and Fair Value [Line Items]
Concentration risk, percentage		25.00%
Accounts Receivable | Customer 2 | Minimum
Financial Instruments and Fair Value [Line Items]
Concentration risk, percentage	10.00%
Debt Mutual Funds
Financial Instruments and Fair Value [Line Items]
Available for sale securities with out contractual maturity date	$ 8
Foreign Exchange Contracts
Financial Instruments and Fair Value [Line Items]
Unrealized Gain (loss) on contracts	$ 0.1	$ 0.4

Schedule of Fair Value of Finan

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Nov. 13, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 338,836	$ 610,840
Contingent consideration			$ 24,000
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	77,789	258,304
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	189,620	254,413
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	56,901	83,615
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,356	979
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	4,610	4,339
Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,971	8,565
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	589	625
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	1,500,288	1,554,381
Derivative assets	92	95
Total	1,500,380	1,554,476
Contingent consideration		7,227
Derivative liabilities	118	504
Total	118	7,731
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	628,740	443,166
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	493,459	470,955
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	77,789	258,304
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	189,620	254,413
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	56,901	83,615
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	1,356	979
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	4,610	4,339
Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,971	8,565
Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	589	625
Fair Value, Measurements, Recurring | Equity Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	39,253	29,420
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	1,088,176	828,919
Total	1,088,176	828,919
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	628,740	443,166
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	412,212	347,768
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,971	8,565
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Equity Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	39,253	29,420
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	412,112	725,462
Derivative assets	92	95
Total	412,204	725,557
Derivative liabilities	118	504
Total	118	504
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	81,247	123,187
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	77,789	258,304
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	189,620	254,413
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	56,901	83,615
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	1,356	979
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	4,610	4,339
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	589	625
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration		7,227
Total	$ 0	$ 7,227

Schedule of Reported Financial

Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 1,500,380	$ 1,554,476
Liabilities	118	7,731
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	118	504
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	1,122,199	914,121
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	244,231	522,280
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	133,858	117,980
Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	92	95
Long Term Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities		7,227
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	1,088,176	828,919
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	1,040,952	790,934
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	47,224	37,985
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	412,204	725,557
Liabilities	118	504
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	118	504
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	81,247	123,187
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	244,231	522,280
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	86,634	79,995
Significant Other Observable Inputs (Level 2) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	92	95
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	$ 0	7,227
Significant Unobservable Inputs (Level 3) | Long Term Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities		$ 7,227

Schedule of Changes in Fair Val

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		$ 7,227		$ 39,705
Foreign currency impact				(355)
Payments	[1]			(8,852)
Fair value adjustment		(7,227)	[2]	(23,271)	[3]
Balance at end of period		$ 0		$ 7,227
[1]	During the year ended December 31, 2020, Teradyne paid $8.9 million of contingent consideration for the earn-out in connection with the acquisition of Mobile Industrial Robots (“MiR”).
[2]	During the year ended December 31, 2021, the fair value of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide was reduced to zero, which resulted in a benefit of $7.2 million, primarily due to a decrease in forecasted revenues and earnings before interest and taxes. As of December 31, 2021, the maximum amount of contingent consideration that could be paid in connection with the acquisition of AutoGuide is $100.2 million. The remaining earn-out period ends on December 31, 2022. The sellers of AutoGuide have filed an arbitration claim against Teradyne related to allegations of non-compliance with its earn-out obligations. The ultimate amount of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide may be affected by the outcome of the arbitration (see Note M: “Commitments and Contingencies”).
[3]	During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of AutoGuide was decreased by $19.7 million primarily due to a decrease in forecasted revenues and earnings before interest and taxes. During the year ended December 31, 2020, the fair value of contingent consideration for the earn-out in connection with the acquisition of MiR was decreased by $3.5 million primarily due to a decrease in forecasted revenues.

Schedule of Changes in Fair V_2

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration	$ 0	$ 8,852	$ 27,615
Increase (decrease) in contingent consideration	(7,227)	(23,271)	$ (19,257)
Avionics Interface Technologies, LLC
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration		8,900
MiR
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase (decrease) in contingent consideration	7,200	19,700
Autoguide LLC [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase (decrease) in contingent consideration		$ 3,500
Autoguide LLC [Member] | Dispute In Respect Of Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase (decrease) in contingent consideration	$ 87,700

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Nov. 13, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 338,836	$ 610,840
Contingent consideration				$ 24,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		1,122,199	914,121
Marketable securities		378,089	640,260
Derivative assets		92	95
Contingent consideration		0	7,227
Derivative liabilities		118	504
Convertible debt	[1]	108,426	410,111
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		1,122,199	914,121
Marketable securities		378,089	640,260
Derivative assets		92	95
Contingent consideration		0	7,227
Derivative liabilities		118	504
Convertible debt	[1]	$ 604,648	$ 1,739,553
[1]	The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion features.

Schedule of Available for Sale

Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 334,077	$ 601,976
Available-for-sale marketable securities, Unrealized Gain	5,477	9,077
Available-for-sale marketable securities, Unrealized (Loss)	(718)	(213)
Available-for-sale marketable securities, Fair Market Value	338,836	610,840
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	91,937	70,418
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	77,707	257,132
Available-for-sale marketable securities, Unrealized Gain	551	1,330
Available-for-sale marketable securities, Unrealized (Loss)	(470)	(158)
Available-for-sale marketable securities, Fair Market Value	77,789	258,304
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	46,435	17,243
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	189,614	254,404
Available-for-sale marketable securities, Unrealized Gain	15	10
Available-for-sale marketable securities, Unrealized (Loss)	(9)	(1)
Available-for-sale marketable securities, Fair Market Value	189,620	254,413
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	22,784	12,173
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	52,266	76,129
Available-for-sale marketable securities, Unrealized Gain	4,863	7,539
Available-for-sale marketable securities, Unrealized (Loss)	(227)	(53)
Available-for-sale marketable securities, Fair Market Value	56,901	83,615
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	19,422	39,896
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	7,928	8,413
Available-for-sale marketable securities, Unrealized Gain	43	152
Available-for-sale marketable securities, Fair Market Value	7,971	8,565
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	4,617	4,294
Available-for-sale marketable securities, Unrealized Gain	5	46
Available-for-sale marketable securities, Unrealized (Loss)	(12)	(1)
Available-for-sale marketable securities, Fair Market Value	4,610	4,339
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,296	1,106
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,356	979
Available-for-sale marketable securities, Fair Market Value	1,356	979
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	589	625
Available-for-sale marketable securities, Fair Market Value	$ 589	$ 625

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 334,077	$ 601,976
Available-for-sale marketable securities, Unrealized Gain	5,477	9,077
Available-for-sale marketable securities, Unrealized (Loss)	(718)	(213)
Available-for-sale marketable securities, Fair Market Value	338,836	610,840
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	91,937	70,418
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	244,213	522,228
Available-for-sale marketable securities, Unrealized Gain	64	92
Available-for-sale marketable securities, Unrealized (Loss)	(46)	(40)
Available-for-sale marketable securities, Fair Market Value	244,231	522,280
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	54,798	61,806
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	89,864	79,748
Available-for-sale marketable securities, Unrealized Gain	5,413	8,985
Available-for-sale marketable securities, Unrealized (Loss)	(672)	(173)
Available-for-sale marketable securities, Fair Market Value	94,605	88,560
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 37,139	$ 8,612

Contractual Maturities of Inves

Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 244,213
Due after 1 year through 5 years, cost	41,459
Due after 5 years through 10 years, cost	6,085
Due after 10 years, cost	34,392
Total, cost	326,149
Due within one year, fair market value	244,231
Due after 1 year through 5 years, fair market value	41,377
Due after 5 years through 10 years, fair market value	6,434
Due after 10 years, fair maket value	38,823
Total, fair market value	$ 330,865

Schedule of Notional Amount of

Schedule of Notional Amount of Derivatives (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 41	$ 56.3
Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(72.5)	(48.3)
Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	113.5	104.6
Japanese Yen
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(31.4)	(14.1)
Japanese Yen | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(31.4)	(14.1)
Taiwan Dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(35.1)	(27.9)
Taiwan Dollar | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(35.1)	(27.9)
Korean Won
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(4.2)	(5.3)
Korean Won | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(4.2)	(5.3)
British Pound Sterling
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(1.8)	(1)
British Pound Sterling | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(1.8)	(1)
Euro
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	44.9	43.9
Euro | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	44.9	43.9
Singapore Dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	61.9	52.3
Singapore Dollar | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	61.9	52.3
Philippines, Pesos
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	3.9	5
Philippines, Pesos | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	3.9	5
China, Yuan Renminbi
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	2.8	3.4
China, Yuan Renminbi | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 2.8	$ 3.4

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ (26)	$ (409)
Not Designated as Hedging Instrument | Foreign currency forward contracts | Prepayments
Derivatives, Fair Value [Line Items]
Derivative assets	92	95
Not Designated as Hedging Instrument | Foreign currency forward contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (118)	$ (504)

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Losses on derivatives recognized in statements of operations	$ 6,488	$ 3,515	$ 5,960

Schedule of Effect of Derivat_2

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on foreign currency transactions	$ 2.1	$ 2.6	$ 1.6

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total lease expense	$ 39.2	$ 38.5	$ 35.6
Variable lease costs	12.6	12.1	11.1
Short-term leases	$ 1.8	$ 3.4	$ 2.6
Operating Lease, Weighted Average Remaining Lease Term	5 years 3 months 18 days	4 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	4.10%	4.80%

Supplemental Cash Flow Informat

Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities included in operating cash flows	$ 24,593	$ 24,136	$ 19,400
Right-of-use assets obtained in exchange for new lease obligations	$ 34,246	$ 14,801	$ 26,739

Schedule of Operating Lease, Ma

Schedule of Operating Lease, Maturity (Detail) $ in Thousands	Dec. 31, 2021USD ($)
2022	$ 22,525
2023	16,187
2024	13,675
2025	10,717
2026	8,553
Thereafter	11,188
Total lease payments	82,845
Less imputed interest	(6,690)
Total lease liabilities	$ 76,155

Debt - Additional Information (

Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands	Feb. 23, 2022USD ($)	May 01, 2020USD ($)	Dec. 12, 2016USD ($)Customer$ / sharesshares	Oct. 03, 2021$ / sharesshares	Dec. 31, 2021USD ($)$ / sharesshares	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Nov. 04, 2021	Dec. 31, 2016USD ($)	Apr. 27, 2015USD ($)
Debt Instrument
Aggregate principal amount					$ 116,980	$ 459,971
Debt instrument, interest rate, stated percentage								1.25%
Repurchase of common stock					$ 600,000	88,465	$ 500,000
Trading days measurement period | Customer			5
Debt issuance costs, amortization period					7 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases					$ 200,000
Line of Credit Facility, Interest Rate Description		The interest rate 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 0.75% per annum or LIBOR plus a margin ranging from 1.00% to 1.75% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.
Term of revolving credit facility					3 years
Debt instrument conversion converted instrument amount					$ 343,000
Convertible common shares					1,512	$ 3,787
Expected principal interest payments in next 12 months					1,500
Expected principal interest payments,thereafter					$ 1,500
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA					15.00%
Other Income Expense [Member]
Debt Instrument
Gain loss on debt conversion					$ 28,800
Convertible Common Shares [Member]
Debt Instrument
Convertible common shares					$ 20,700
Collateral Pledged [Member]
Debt Instrument
Line of Credit Facility, Interest Rate Description					65
1.25% Convertible Senior Unsecured Notes Due December 15, 2023
Debt Instrument
Aggregate principal amount			$ 460,000		$ 460,000
Debt instrument, interest rate, stated percentage			1.25%
Debt instrument, net proceeds after issuance costs			$ 450,800
Payment for net cost of convertible note hedges net of warrant proceeds			33,000		$ 33,000
Repurchase of common stock			$ 50,100
Repurchase of stock, shares | shares			2,000,000
Senior notes maturity date			Dec. 15, 2023
Debt instrument, frequency of periodic payment			payable semiannually in arrears on June 15 and December 15 of each year.
Debt instrument, date of first required payment			Mar. 31, 2017
Debt instrument, conversion option expiration date			Sep. 15, 2023
Consecutive trading days measurement period | Customer			5
Debt instrument conversion price | $ / shares			$ 31.52	$ 31.52	$ 31.52
Shares that would be issued upon conversion | shares				4,400,000	14,600,000
Strike price per share of warrant | $ / shares					$ 39.55
Debt instrument, convertible, carrying amount of equity component					$ 100,800
Debt instrument, effective annual interest rate					5.00%
Financing cost					$ 600				$ 7,200
Unamortized discount					$ 8,600
Debt Instrument, convertible, remaining discount amortization period					2 years
Value of notes converted					$ 606,900
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Subsequent Event
Debt Instrument
Debt instrument conversion converted instrument amount	$ 362,600
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option one
Debt Instrument
Trading days measurement period | Customer			20
Consecutive trading days measurement period | Customer			30
Percentage of conversion price			130.00%
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option two
Debt Instrument
Aggregate principal amount			$ 1,000
Percentage of closing sale price of common stock and conversion rate product			98.00%
Revolving Credit Facility
Debt Instrument
Term of loan, years					5 years
Credit facility, borrowing capacity										$ 350,000
Revolving Credit Facility | Maximum | Truist Bank [Member]
Debt Instrument
Commitment fee percentage of unused portion of credit facility					0.25%
Revolving Credit Facility | Minimum | Truist Bank [Member]
Debt Instrument
Commitment fee percentage of unused portion of credit facility					0.15%
Revolving Credit Facility | Base Rate | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate					0.75%
Revolving Credit Facility | Base Rate | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate					0.00%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate					1.75%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate					1.00%

Components of Convertible Senio

Components of Convertible Senior Notes (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument
Debt principal	$ 116,980	$ 459,971
Unamortized discount	8,554	49,860
Current debt	19,182	33,343
Long-term debt	89,244	376,768
Net carrying amount of convertible debt	$ 108,426	$ 410,111

Interest Expense on Convertible

Interest Expense on Convertible Senior Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument
Contractual interest expense on the coupon	$ 3,009	$ 5,750
Amortization of the discount component and debt issue fees recognized as interest expense	11,019	15,454
Total interest expense on the convertible debt	$ 14,028	$ 21,204

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,207,018	$ 1,480,158	$ 1,522,354
Other comprehensive income (loss)	(39,464)	52,370	(5,814)
Balance	2,562,444	2,207,018	1,480,158
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	25,389	(23,514)
Other comprehensive loss before reclassifications, net of tax	(36,207)	48,903
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive income (loss)	(36,207)	48,903
Balance	(10,818)	25,389	(23,514)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	6,954	3,480
Other comprehensive loss before reclassifications, net of tax	(2,255)	5,839
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(995)	(2,365)
Other comprehensive income (loss)	(3,250)	3,474
Balance	3,704	6,954	3,480
Amortization of Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,173	1,180
Other comprehensive loss before reclassifications, net of tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(7)	(7)	(148)
Other comprehensive income (loss)	(7)	(7)
Balance	1,166	1,173	1,180
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	33,516	(18,854)	(13,040)
Other comprehensive loss before reclassifications, net of tax	(38,462)	54,742
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1,002)	(2,372)	(838)
Other comprehensive income (loss)	(39,464)	52,370	(5,814)
Balance	$ (5,948)	$ 33,516	$ (18,854)

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (279)	$ (667)	$ (235)
Foreign currency translation adjustments, tax	0	0	0
Unrealized (losses) gains on marketable securities, tax	1,055	1,910	946
Retirement plans prior service benefit, tax	(1,128)	(1,126)	(1,124)
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	0	0
Other comprehensive income (loss), tax	0	0
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	(578)	1,629
Amounts reclassified from accumulated other comprehensive income (loss), tax	(277)	(665)	(192)
Other comprehensive income (loss), tax	(855)	964
Amortization of Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	(2)	(2)	$ (43)
Other comprehensive income (loss), tax	$ (2)	$ (2)

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive (Loss) Income to Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	$ 995	$ 2,365	$ 690
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	7	7	148
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	$ 1,002	$ 2,372	$ 838

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive (Loss) Income to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 279	$ 667	$ 235
Unrealized (Losses) Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	277	665	192
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 2	$ 2	$ 43

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill, Impairment Loss	$ 0
Acquired intangible assets amortization		$ 21,456	$ 30,803	$ 40,147

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Goodwill [Line Items]
Foreign currency translation adjustment	$ (27,835)	$ 37,577
Goodwill	1,216,425	1,178,997	$ 1,188,590
Accumulated impairment losses		(762,566)	(762,566)
Goodwill	453,859	416,431	426,024
Autoguide LLC
Goodwill [Line Items]
Goodwill acquisition		(149)
Industrial Automation
Goodwill [Line Items]
Foreign currency translation adjustment	(27,781)	37,418
Goodwill	433,752	396,483	405,971
Goodwill	433,752	396,483	405,971
Industrial Automation | Autoguide LLC
Goodwill [Line Items]
Goodwill acquisition		(149)
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)	(353,843)
Goodwill	7,976	7,976	7,976
Semiconductor Test
Goodwill [Line Items]
Foreign currency translation adjustment	(54)	159
Goodwill	262,155	261,996	262,101
Accumulated impairment losses	(260,540)	(260,540)	(260,540)
Goodwill	1,615	1,456	1,561
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)	(148,183)
Goodwill	$ 10,516	$ 10,516	$ 10,516

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 389,673	$ 408,906
Accumulated Amortization	(309,571)	(307,347)
Foreign Currency Translation Adjustment	(4,467)	(620)
Net Carrying Amount	75,635	100,939
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	272,547	272,547
Accumulated Amortization	(223,413)	(210,479)
Foreign Currency Translation Adjustment	(4,093)	(1,610)
Net Carrying Amount	45,041	60,458
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	57,739	66,239
Accumulated Amortization	(48,921)	(54,524)
Foreign Currency Translation Adjustment	209	305
Net Carrying Amount	9,027	12,020
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	59,387	70,120
Accumulated Amortization	(37,237)	(42,344)
Foreign Currency Translation Adjustment	(583)	685
Net Carrying Amount	$ 21,567	$ 28,461

Schedule of Amortizable Intan_2

Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Finite-Lived Intangible Assets
Impairment of intangible assets	$ 19.2

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Finite-Lived Intangible Assets
2022	$ 20,081
2023	19,592
2024	19,283
2025	11,546
2026	2,423
Thereafter	$ 2,710

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Oct. 18, 2019	Dec. 31, 2021	Dec. 31, 2020
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments		$ 884.3
Purchase commitments less than one year		839.2
Product warranty accrual		24.6	$ 16.6
Revenue deferrals related to extended warranties		$ 64.2	$ 51.9
Legal claims, damage sought by party	$ 106.9

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		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income Loss Per Common Share
Net income for basic and diluted net income per share		$ 1,014,589	$ 784,147	$ 467,468
Weighted average common shares-basic		164,960	166,120	170,425
Convertible note hedge warrant shares	[1]	9,956	6,989	2,698
Incremental shares from assumed conversion of convertible notes	[2]	7,435	8,528	4,909
Employee stock purchase rights		8	10	13
Dilutive potential common shares		18,665	16,922	9,034
Weighted average common shares-diluted		183,625	183,042	179,459
Net income per common share-basic		$ 6.15	$ 4.72	$ 2.74
Net income per common share-diluted		$ 5.53	$ 4.28	$ 2.60
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		1,180	1,264	1,236
Stock Options
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		86	131	178
[1]	Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.55, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.
[2]	Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.52, multiplied by 4.4 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Computation of Basic and Dilu_2

Computation of Basic and Diluted Net Income Per Common Share (Parenthetical) (Detail) shares in Millions	12 Months Ended
	Dec. 31, 2021$ / sharesshares
Convertible Notes
Net Income Loss Per Common Share
Initial debt conversion price | $ / shares	$ 31.52
Shares that would be issued upon conversion | shares	4.4
Convertible Notes Hedge Warrant
Net Income Loss Per Common Share
Initial debt conversion price | $ / shares	$ 39.55
Shares that would be issued upon conversion | shares	14.6

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Employee Stock Option [Member]
Net Income Loss Per Common Share
Exercise of stock options	0.1
Restricted Stock Units (RSUs) [Member]
Net Income Loss Per Common Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0.1

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve
Contingent consideration adjustment	$ (7,227)	$ (23,271)	$ (19,257)
Semiconductor Test
Restructuring Cost and Reserve
Contingent consideration adjustment		3,500
Severance benefit and charges	14,500	2,300
Acquisition related costs	500	2,500	2,500
Contract termination settlement fee		4,000
AutoGuide
Restructuring Cost and Reserve
Contingent consideration adjustment			3,000
Mobile Industrial Robots (MiR) | Semiconductor Test
Restructuring Cost and Reserve
Contingent consideration adjustment			22,200
TER Autoguide Llc [Member]
Restructuring Cost and Reserve
Contingent consideration adjustment	7,200
Semiconductor Test, Industrial Automation and Corporate
Restructuring Cost and Reserve
Severance benefit and charges			$ 2,900
Restructuring and other		1,200
TER Corporate And Eliminations | Universal Robots (UR)
Restructuring Cost and Reserve
Contingent consideration adjustment	$ 1,500	$ 19,700

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)Participant	Dec. 31, 2019USD ($)
Defined Benefit Plan Disclosure
Number of retiree participants | Participant		115
Defined Benefit Plan, decrease in benefit obligation		$ 27,600,000
Defined Benefit Plan, decrease in plan assets		24,400,000
Actrual loss on benefit obligations		4,000,000
Gain (Loss) Due to Settlement		(500,000)
Fair value of pension plans assets totaled	$ 151,600,000
UNITED STATES
Defined Benefit Plan Disclosure
Actrual loss on benefit obligations	6,432,000	(24,671,000)
Accumulated benefit obligation for defined benefit pension plans	$ 187,500,000	$ 196,700,000
Percentage of expected return on plan assets assumption	2.40%	3.00%	4.30%
Discount rate utilized to determine future pension obligations	2.60%	2.20%
Fair value of pension plans assets totaled	$ 149,578,000	$ 158,855,000	$ 166,932,000
Contribution to defined benefit pension plans	3,276,000	3,098,000
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Actrual loss on benefit obligations	2,257,000	(2,951,000)
Accumulated benefit obligation for defined benefit pension plans	$ 42,500,000	$ 46,500,000
Percentage of expected return on plan assets assumption	3.50%	3.80%	2.00%
Discount rate utilized to determine future pension obligations	1.10%	0.70%
Fair value of pension plans assets totaled	$ 2,017,000	$ 1,856,000	$ 1,586,000
Contribution to defined benefit pension plans	$ 1,022,000	$ 1,079,000
United States Plans
Defined Benefit Plan Disclosure
Percentage of expected return on plan assets assumption	2.40%
Discount rate utilized to determine future pension obligations	2.65%	2.30%
Fair value of pension plans assets totaled	$ 149,600,000
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	3,300,000	$ 3,100,000
Contribution to defined benefit pension plans in 2018	7,200	3,300,000
Contribution to defined benefit pension plans in One to Three Years	6,700
Contribution to defined benefit pension plans thereafter	18,300
Non-United States Subsidiaries
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	1,000,000	1,100,000
Contribution to defined benefit pension plans in 2018	2,300	$ 1,000,000
Contribution to defined benefit pension plans in One to Three Years	2,500
Contribution to defined benefit pension plans thereafter	6,900
Taiwan Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Fair value of pension plans assets totaled	2,000,000
German Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, decrease in benefit obligation	3,300
Actrual loss on benefit obligations	8,700
U.S. Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans in 2018	900,000
Contribution to defined benefit pension plans in One to Three Years	1,400,000
Contribution to defined benefit pension plans thereafter	1,400,000
Contribution to defined benefit pension plans	$ 900,000

Schedule of Defined Benefit Pen

Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure
Actuarial loss		$ (4,000)
Ending Balance	$ 151,600
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	202,233	203,791
Service cost	1,784	1,773	$ 1,608
Interest cost	4,427	5,770	7,189
Actuarial loss	(6,432)	24,671
Benefits paid	(9,337)	(9,844)
Retiree annuity purchase	0	(24,379)
Liability loss due to settlement	(204)	451
Non-U.S. currency movement	0	0
Projected benefit obligation, End of year	192,472	202,233	203,791
Beginning Balance	158,855	166,932
Actual return on plan assets	(3,217)	23,048
Company contributions	3,276	3,098
Benefits paid	(9,337)	(9,844)
Retiree annuity purchase	0	(24,379)
Non-U.S. currency movement	0	0
Ending Balance	149,578	158,855	166,932
Funded status	(42,894)	(43,378)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	50,988	43,952
Service cost	941	907	751
Interest cost	337	516	691
Actuarial loss	(2,257)	2,951
Benefits paid	(925)	(1,299)
Retiree annuity purchase	0	0
Liability loss due to settlement	0	0
Non-U.S. currency movement	(3,310)	3,961
Projected benefit obligation, End of year	45,774	50,988	43,952
Beginning Balance	1,856	1,586
Actual return on plan assets	33	67
Company contributions	1,022	1,079
Benefits paid	(925)	(988)
Retiree annuity purchase	0	0
Non-U.S. currency movement	31	112
Ending Balance	2,017	1,856	1,586
Funded status	(43,757)	(49,132)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	8,515	9,003
Service cost	64	57	41
Interest cost	170	240	347
Actuarial loss	(433)	421
Benefits paid	(1,107)	(1,205)
Projected benefit obligation, End of year	7,210	8,515	$ 9,003
Beginning Balance	0
Company contributions	1,107	1,205
Benefits paid	(1,107)	(1,205)
Ending Balance	0	0
Funded status	$ (7,210)	$ (8,515)

Schedule of Amounts Recorded wi

Schedule of Amounts Recorded within Statements of Financial Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Retirement plans assets	$ 15,110	$ 17,468
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Retirement plans assets	15,110	17,468
Accrued employees' compensation and withholdings	(3,288)	(3,273)
Retirement plans liabilities	(54,716)	(57,573)
Funded status	(42,894)	(43,378)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accrued employees' compensation and withholdings	(936)	(1,019)
Retirement plans liabilities	(42,821)	(48,113)
Funded status	(43,757)	(49,132)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued employees' compensation and withholdings	(930)	(1,161)
Retirement plans liabilities	(6,280)	(7,354)
Funded status	$ (7,210)	$ (8,515)

Schedule of Amounts Recognized

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (loss) (Detail) - Postretirement Benefit Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure
Prior service cost, before tax	$ (40)	$ (49)
Deferred taxes	(1,688)	(1,686)
Total recognized in other comprehensive income (loss), net of tax	$ (1,728)	$ (1,735)

Schedule of Pension Plans with

Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 58	$ 60.8
Accumulated benefit obligation	55.7	58.5
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation	45.8	51
Accumulated benefit obligation	42.5	46.5
Fair value of plan assets	$ 2	$ 1.9

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure
Net actuarial loss (gain)	$ (2,217)	$ 10,284	$ 8,176
UNITED STATES
Defined Benefit Plan Disclosure
Service cost	1,784	1,773	1,608
Interest cost	4,427	5,770	7,189
Expected return on plan assets	(3,858)	(4,840)	(6,042)
Net actuarial loss (gain)	643	6,463	2,973
Settlement loss	(204)	451
Total net periodic pension cost	2,792	9,617	5,728
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	941	907	751
Interest cost	337	516	691
Expected return on plan assets	(67)	(65)	(29)
Net actuarial loss (gain)	(2,223)	2,949	4,485
Total net periodic pension cost	(1,012)	4,307	5,898
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	64	57	41
Interest cost	170	240	347
Amortization of prior service cost	(9)	(9)	(191)
Net actuarial loss (gain)	(433)	421	717
Total net periodic pension cost	(208)	709	914
Prior service cost	9	9	191
Total recognized in other comprehensive income	$ (199)	$ 718	$ 1,105

Schedule of Weighted Average -

Schedule of Weighted Average - Assumptions to Determine Net Periodic Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
UNITED STATES
Defined Benefit Plan Disclosure
Discount rate	2.20%	2.80%	4.10%
Expected return on plan assets	2.40%	3.00%	4.30%
Salary progression rate	2.40%	2.60%	2.30%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Discount rate	0.70%	1.10%	1.80%
Expected return on plan assets	3.50%	3.80%	2.00%
Salary progression rate	2.30%	2.50%	2.50%
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Discount rate	2.20%	3.00%	4.00%
Initial health care cost trend rate	7.30%	7.10%	7.50%
Ultimate health care cost trend rate	4.50%	4.50%	4.50%
Year in which ultimate health care cost trend rate is reached	2029	2026	2026

Schedule of Weighted Average As

Schedule of Weighted Average Assumptions to Determine Pension Obligations (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Discount rate	2.60%	2.20%	3.00%
Initial medical trend	7.30%	7.30%	7.10%
Ultimate health care trend	4.50%	4.50%	4.50%
Medical cost trend rate decrease to ultimate rate in year	2029	2029	2026
UNITED STATES
Defined Benefit Plan Disclosure
Discount rate	2.60%	2.20%
Salary progression rate	2.40%	2.40%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Discount rate	1.10%	0.70%
Salary progression rate	2.20%	2.30%

Schedule of Weighted Average Pe

Schedule of Weighted Average Pension Assets Allocations by Category (Detail)	Dec. 31, 2021	Dec. 31, 2020
UNITED STATES
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
UNITED STATES | Fixed income securities
Defined Benefit Plan Disclosure
Total	94.00%	94.00%
UNITED STATES | Equity securities
Defined Benefit Plan Disclosure
Total	5.00%	5.00%
UNITED STATES | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	1.00%	1.00%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
Foreign Pension Plans, Defined Benefit | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	100.00%	100.00%

Schedule of Target Assets Alloc

Schedule of Target Assets Allocation (Detail)	Dec. 31, 2021
Bloomberg Barclays Corporate or Better Index | U.S. corporate fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	75.00%
MSCI World Minimum Volatility Index | Global equity Securities
Defined Benefit Plan Disclosure
Target assets allocation percentage	5.00%
Bloomberg Barclays Long Government Bond Index | U.S. government fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	14.00%
Bloomberg Barclays High Yield Index | High yield fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	5.00%
Citigroup Three Month Treasury Bill Index | Cash
Defined Benefit Plan Disclosure
Target assets allocation percentage	1.00%

Schedule of Fair Value of Pensi

Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure
Total	$ 151,600
UNITED STATES
Defined Benefit Plan Disclosure
Total	149,578	$ 158,855	$ 166,932
UNITED STATES | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Defined Benefit Plan Disclosure
Total	1,500	1,582
UNITED STATES | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	148,078	157,273
UNITED STATES | Corporate Debt Securities
Defined Benefit Plan Disclosure
Total	119,805	127,098
UNITED STATES | Corporate Debt Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	119,805	127,098
UNITED STATES | US Government Debt Securities
Defined Benefit Plan Disclosure
Total	20,847	22,250
UNITED STATES | US Government Debt Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	20,847	22,250
UNITED STATES | Global equity Securities
Defined Benefit Plan Disclosure
Total	7,426	7,925
UNITED STATES | Global equity Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	7,426	7,925
UNITED STATES | Cash and Cash Equivalents
Defined Benefit Plan Disclosure
Total	1,500	1,582
UNITED STATES | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Defined Benefit Plan Disclosure
Total	1,500	1,582
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	2,017	1,856	$ 1,586
Foreign Pension Plans, Defined Benefit | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	2,017	1,856
Foreign Pension Plans, Defined Benefit | Other
Defined Benefit Plan Disclosure
Total	2,017	1,856
Foreign Pension Plans, Defined Benefit | Other | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	$ 2,017	$ 1,856

Schedule of Expected Future Ben

Schedule of Expected Future Benefit Payments (Detail) $ in Thousands	Dec. 31, 2021USD ($)
UNITED STATES
Defined Benefit Plan Disclosure
2022	$ 9,784
2023	9,386
2024	9,771
2025	10,333
2026	10,594
2027-2030	54,616
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
2022	982
2023	1,268
2024	1,119
2025	1,074
2026	1,192
2027-2030	8,123
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
2022	930
2023	774
2024	641
2025	528
2026	419
2027-2030	$ 1,408

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended						12 Months Ended
	Jan. 31, 2022	Jul. 31, 2021	Jan. 31, 2021	Jul. 31, 2020	Jan. 31, 2020	Jul. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period							3 years
Restricted stock unit awards granted							447,000	616,000	1,139,000
Weighted average grant date fair value of restricted stock units granted							$ 115,510	$ 72,760	$ 39,080
Stock price							$ 113.48	$ 72.61	$ 37.95
Tax benefit from compensation expense							$ 14,389,000	$ 13,060,000	$ 8,360,000
Total unrecognized expense related to non-vested restricted stock unit awards and stock options							$ 50,600,000
Unrecognized expense related to non-vested restricted stock unit awards and stock options expected to be recognized over weighted average period, in years							2 years 4 months 24 days
Maximum percent of shares allowed to purchase							10.00%
Fair market value							$ 25,000
Maximum number of shares allowed to purchase							6,000
Percentage of common stock price paid							85.00%
Common stock issued to employees		100,000	100,000	200,000	200,000	300,000
Value of common stock issued to employees per share		$ 113.87		$ 71.83		$ 40.72	$ 139	$ 101.91	$ 57.96
Number of shares available for grant							5,713,000	6,123,000	6,727,000	7,874,000
Stock Based Compensation Relating To Retirement Agreement							$ 45,643,000	$ 44,906,000	$ 37,897,000
Discrete tax benefit							14,700,000	9,600,000	4,900,000
Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Stock Based Compensation Relating To Retirement Agreement									2,100
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Cash received from employees, employee stock options exercises							3,100,000	3,800,000	3,700,000
Tax benefit from compensation expense							$ 400,000	$ 1,500,000	$ 2,000,000
Percentage of common stock price paid							100.00%
Stock Options | Minimum [Member]
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 | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments							7 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							447,000	616,000	1,139,000
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments							4 years
Restricted Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments							1 year
Percentage of awards vesting on the first anniversary of grant date							100.00%
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							100,000	100,000	100,000
Weighted average grant date fair value of restricted stock units granted							$ 125.02	$ 89.93	$ 51.51
Stock price							113.48	72.10	37.95
TSR Performance-Based Restricted Stock Units | Measurement Input, Expected Dividend Payment [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Estimated annual dividend amount per share							$ 0.40	$ 0.40	$ 0.36
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%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant							4,200,000
PBIT Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							100,000	100,000	100,000
Weighted average grant date fair value of restricted stock units granted							$ 113.65	$ 70.94	$ 36.88
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							300,000	400,000	800,000
Weighted average grant date fair value of restricted stock units granted							$ 114.16	$ 71.31	$ 37.65
Service-Based Restricted Stock Units | Non Employee Directors And Certain Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							100,000	100,000	100,000
Weighted average grant date fair value of restricted stock units granted							$ 128.70	$ 66.56	$ 48.03
Service Based Stock Options | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							100,000	100,000	100,000
Weighted average grant date fair value of restricted stock units granted							$ 36.60	$ 20.93	$ 10.64
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Common stock issued to employees	100,000

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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	0.20%	1.50%	2.60%
Expected historical volatility	43.90%	34.90%	31.90%
Dividend yield	0.40%	0.60%	1.00%
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	22.90%	11.40%	11.90%

Schedule of Estimated Fair Va_2

Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Stock Options	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	5 years	5 years	5 years
Risk-free interest rate	0.40%	1.50%	2.50%
Volatility-historical	37.80%	32.00%	30.10%
Dividend yield	0.40%	0.50%	1.00%

Schedule of Stock Compensation

Schedule of Stock Compensation Plan Activity (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Awarded	447	616	1,139
Forfeited	(70)	(68)	(87)
Outstanding at January 1	216	319	506
Granted	34	56	102
Exercised	(78)	(159)	(280)
Forfeited	(1)		(7)
Expired			(2)
Outstanding at December 31	171	216	319
Vested and expected to vest at December 31	171	216	319
Exercisable at December 31	30	27	85
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Non-vested at January 1	1,789	2,269	2,454
Awarded	447	616	1,139
Vested	(749)	(1,028)	(1,237)
Forfeited	(70)	(68)	(87)
Non-vested at December 31	1,417	1,789	2,269

Schedule of Share Based Compens

Schedule of Share Based Compensation Total Shares Available (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Available for grant at January 1	6,123	6,727	7,874
Options granted	(34)	(56)	(102)
Options forfeited	1		7
Restricted stock units awarded	(447)	(616)	(1,139)
Restricted stock units forfeited	70	68	87
Available for grant at December 31	5,713	6,123	6,727

Schedule of Weighted-Average Re

Schedule of Weighted-Average Restricted Stock Unit Award Fair Value (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Non-vested at January 1	$ 47,840	$ 35,580	$ 29,220
Awarded	115,510	72,760	39,080
Vested	43,990	31,530	23,590
Forfeited	65,520	45,360	35,600
Non-vested at December 31	$ 67,970	$ 47,840	$ 35,580

Schedule of Restricted Stock Un

Schedule of Restricted Stock Unit Awards Aggregate Intrinsic Value (Detail) - Restricted Stock Units - USD ($) $ / shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Vested	$ 101,679	$ 71,582	$ 46,110
Outstanding	$ 231,763	$ 214,509	$ 154,752
Expected to vest	$ 231,246	$ 210,301	$ 152,374

Schedule of Restricted Stock _2

Schedule of Restricted Stock Units Weighted Average Remaining Contractual Terms (Detail) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding	10 months 20 days	11 months 15 days	1 year 7 days
Expected to vest	10 months 20 days	11 months 15 days	1 year 7 days

Schedule of Weighted Average St

Schedule of Weighted Average Stock Options Exercise Price (Detail)	12 Months Ended
	Dec. 31, 2021$ / shares
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding at January 1	$ 45.59
Options granted	113.48
Options exercised	39.68
Options forfeited
Options cancelled	2.67
Outstanding at December 31	62.13
Exercisable at December 31	$ 34.65

Schedule of Stock Option Aggreg

Schedule of Stock Option Aggregated Intrinsic Value Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Exercised	$ 6,345	$ 9,682	$ 9,232
Outstanding	17,356	16,083	12,218
Vested and expected to vest	13,500	13,499	7,701
Exercisable	$ 3,856	$ 2,584	$ 4,517

Schedule of Stock Options Weigh

Schedule of Stock Options Weighted Average Remaining Contractual Terms (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding	4 years 4 months 24 days	4 years 7 months 6 days	4 years 2 months 12 days
Vested and expected to vest	4 years 9 months 18 days	4 years 10 months 24 days	5 years
Exercisable	2 years 6 months	2 years 6 months	2 years 1 month 6 days

Stock Based Compensation (Detai

Stock Based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 45,643	$ 44,906	$ 37,897
Income tax benefit	(14,389)	(13,060)	(8,360)
Total stock-based compensation expense after income taxes	31,254	31,846	29,537
Cost Of Revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	4,196	4,227	3,480
Engineering And Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	9,783	12,039	9,913
Selling and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 31,664	$ 28,640	$ 24,504

Savings Plan - Additional Infor

Savings Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Savings Plan [Line Items]
Savings plan maximum percentage of employees contribution allowable	20.00%
Percentage of employer contributions vested per year	25.00%
Maximum employment period considered for vesting of employers' contribution, in years	4 years
Liability, Retirement and Postemployment Benefits	$ 47.2	$ 38
U.S. Qualified Pension Plan
Savings Plan [Line Items]
Maximum percentage of matching contributions made by the employer	100.00%	100.00%	100.00%
Percentage of employer match on employee contribution	4.00%	4.00%	4.00%
Savings Plan
Savings Plan [Line Items]
Amounts charged to statements of operations	$ 26.9	$ 21.7	$ 20.9

Schedule of Income (Loss) Befor

Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
U.S.		$ 403,451	$ 312,153	$ 192,442
Non-U.S.		757,504	588,862	333,330
Income before income taxes	[1],[2]	$ 1,160,955	$ 901,015	$ 525,772
[1]	Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation.
[2]	Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges.

Schedule of Provision (Benefit)

Schedule of Provision (Benefit) for Income Taxes from Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Current, U.S. Federal	$ 58,218	$ 58,678	$ 19,297
Current, Non-U.S.	105,153	75,193	52,810
Current, State	300	(1,315)	(4,347)
Current, Total	163,671	132,556	67,760
Deferred, U.S. Federal	(15,106)	(12,604)	(4,522)
Deferred, Non-U.S.	(4,300)	(5,127)	(8,007)
Deferred, State	2,101	2,043	3,073
Deferred, Total	(17,305)	(15,688)	(9,456)
Total provision for income taxes	$ 146,366	$ 116,868	$ 58,304

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Total (benefit) provision for income taxes	$ 146,366	$ 116,868	$ 58,304
Effective tax rate	12.60%	13.00%	11.10%
Provisional amount of additional income tax expense				$ 49,500	$ 186,000
Transition tax on mandatory deemed repatriation of foreign earnings				51,700	161,000
Expense (benefit) associated with impact of correlative adjustments on tax positions				2,200
Tax savings due to the tax holiday	$ 33,300	$ 15,100	$ 29,900
Tax savings due to the tax holiday, per share	$ 0.16	$ 0.18	$ 0.08
Tax holiday expiration date	December 31, 2025
Valuation allowance includes net deferred tax assets	$ 97,170	$ 84,962
Tax credit carryforwards, approximately					128,900
Tax credits carryforwards	98,378	87,595
Reduction in unrecognized tax benefits	14,465	17,903	$ 21,180	$ 43,395
Unrecognized tax benefits, if recognized would impact effective tax rate	9,500
Unrecognized tax benefits, if recognized would impact deferred taxes	4,900
Accrued interest and penalties	300	1,200
Interest and penalties related to income tax, expense (benefit)	900	200	$ 1,100
Expense related to remeasurement of deferred tax assets and liabilities	33,600
Expected future payments related transition tax in 2022	7,900
Expected future payments related transition tax in one to three years	22,700
Expected future payments related transition tax in three to five years	44,300
Possible Lapse Of Statutes Of Limitations [Member]
Income Taxes [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	3,000
InterCompany Cost Sharing Arrangement [Member]
Income Taxes [Line Items]
Total (benefit) provision for income taxes	2,500	$ 2,300
United States
Income Taxes [Line Items]
Tax credits carryforwards, business					$ 1,900
Tax credit carryforward, expiration date					2028
State and Local Jurisdiction
Income Taxes [Line Items]
Provisional amount of additional income tax expense					$ 186,000
Expense (benefit) associated with impact of correlative adjustments on tax positions					10,300
Tax credits carryforwards					$ 127,100
Reduction in unrecognized tax benefits	$ 14,500
State and Local Jurisdiction | Earliest Tax Year
Income Taxes [Line Items]
Tax credit carryforward, expiration date					2022
State and Local Jurisdiction | Latest Tax Year
Income Taxes [Line Items]
Tax credit carryforward, expiration date					2041
State and Local Jurisdiction | Do Not Expire
Income Taxes [Line Items]
Tax credits carryforwards					$ 68,700

Schedule of Reconciliation of E

Schedule of Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	0.20%	0.30%	0.50%
U.S. global intangible low-taxed income	0.60%	2.10%	1.80%
Foreign taxes	(4.50%)	(5.60%)	(4.00%)
U.S. foreign derived intangible income	(2.30%)	(2.20%)	(2.60%)
U.S. research and development credit	(1.40%)	(1.30%)	(1.80%)
Equity compensation	(0.90%)	(0.60%)	(0.70%)
Foreign tax credits	(0.50%)	(1.20%)	(1.60%)
Uncertain tax positions	(0.40%)	(0.10%)	(4.30%)
U.S. transition tax			1.90%
Other, net	0.80%	0.60%	0.90%
Effective tax rate, Total	12.60%	13.00%	11.10%

Schedule of Components of Defer

Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Tax credits	$ 98,378	$ 87,595
Accruals	41,459	33,156
Pension liabilities	28,722	28,348
Inventory valuations	20,991	18,427
Lease liability	16,484	12,627
Deferred revenue	11,164	9,235
Equity compensation	6,630	6,543
Vacation accrual	6,050	5,890
Investment impairment	3,292	3,292
Net operating loss carryforwards	1,721	1,823
Other	774	626
Gross deferred tax assets	235,665	207,562
Less: valuation allowance	(97,170)	(84,962)
Total deferred tax assets	138,495	122,600
Right of use assets	(14,738)	(10,688)
Depreciation	(10,691)	(14,525)
Intangible assets	(8,531)	(12,726)
Contingent consideration	(5,214)	(3,515)
Marketable securities	(3,220)	(3,344)
Other		(710)
Total deferred tax liabilities	(42,394)	(45,508)
Net deferred assets	$ 96,101	$ 77,092

Summary of Operating Loss Carry

Summary of Operating Loss Carryforwards (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	$ 861
Foreign Operating Loss Carryforwards	860
2022
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	144
Foreign Operating Loss Carryforwards	53
2023
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	208
2024
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	51
2025
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	4
2026
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	0
2027-2031
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	361
Foreign Operating Loss Carryforwards	173
2032-2036
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	58
Foreign Operating Loss Carryforwards	13
Beyond 2036
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	22
Non-Expiring
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	13
Foreign Operating Loss Carryforwards	$ 621

Schedule of Unrecognized Tax Be

Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Beginning balance, as of January 1	$ 17,903	$ 21,180	$ 43,395
Tax positions for current year, Additions	1,417	1,082	1,322
Tax positions for prior years, Additions	30	66	8,043
Tax positions for prior years, Reductions	(1,639)	(2,989)	(31,397)
Expiration of statutes, Reductions	(3,246)	(1,436)	(183)
Ending balance as of December 31	$ 14,465	$ 17,903	$ 21,180

Operating Segment, Geographic_3

Operating Segment, Geographic and Significant Customer Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021Segment	Dec. 31, 2020	Dec. 31, 2019Customer
Segment Reporting Information [Line Items]
Operating segments | Segment	4
Number of customer accounted for more than ten percent of consolidated revenue | Customer			0
Consolidated Revenue
Segment Reporting Information [Line Items]
Concentration risk, percentage			10.00%
Semiconductor Test | Consolidated Revenue | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	19.00%	25.00%	10.00%
Semiconductor Test | Customer 1 | Consolidated Revenue | Revenue from Rights Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.00%	15.00%
Semiconductor Test | Customer 1 | Consolidated Revenue | Revenue from Rights Concentration Risk | Series of Customer [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	0.00%	3.00%	11.00%

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	[1],[2]	$ 3,702,881	$ 3,121,469	$ 2,294,965
Income (loss) before taxes	[3],[4]	1,160,955	901,015	525,772
Total assets	[5]	3,809,425	3,652,346	2,787,014
Property additions		132,472	184,977	134,642
Depreciation and amortization expense		125,485	126,743	120,655
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		2,642,342	2,259,597	1,552,571
Income (loss) before taxes	[3],[4]	976,988	739,695	416,973
Total assets	[5]	1,245,596	1,070,378	784,808
Property additions		115,618	168,055	112,145
Depreciation and amortization expense		75,982	64,998	59,197
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	467,739	409,729	287,455
Income (loss) before taxes	[3],[4]	163,064	152,092	93,543
Total assets	[5]	170,954	138,295	131,428
Property additions		3,905	3,092	3,059
Depreciation and amortization expense		3,156	3,426	5,518
Industrial Automation
Segment Reporting Information [Line Items]
Revenues		375,905	279,731	298,139
Income (loss) before taxes	[3],[4]	(8,167)	(24,019)	(5,916)
Total assets	[5]	701,196	712,936	671,559
Property additions		9,821	8,899	9,076
Depreciation and amortization expense		27,336	36,242	40,904
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	216,895	173,016	157,315
Income (loss) before taxes	[3],[4]	83,543	41,950	35,585
Total assets	[5]	107,513	106,273	97,299
Property additions		3,128	4,931	10,362
Depreciation and amortization expense		6,055	6,258	5,365
Corporate And Others [Member]
Segment Reporting Information [Line Items]
Revenues			(604)	(515)
Income (loss) before taxes	[3],[4]	(54,473)	(8,703)	(14,413)
Total assets	[5]	1,584,166	1,624,464	1,101,920
Depreciation and amortization expense		$ 12,956	$ 15,819	$ 9,671
[1]	Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2]	Revenues attributable to a country are based on location of customer site.
[3]	Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation.
[4]	Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges.
[5]	Total assets are attributable to each segment. 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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Restructuring and other-employee severance	$ 9,312	$ (13,202)	$ (13,880)
Contingent consideration adjustment	(7,227)	(23,271)	(19,257)
Investment impairment	0	0	15,000
Other (income) expense, net—loss on convertible debt conversion	(24,572)	(9,192)	(22,648)
Semiconductor Test
Segment Reporting Information [Line Items]
Acquisition related costs	500	2,500	2,500
Cost of revenues-inventory charge			1,277
Restructuring and other-employee severance	6,661
Contingent consideration adjustment		3,500
Contract termination settlement fee		4,000
Semiconductor Test | Mobile Industrial Robots (MiR)
Segment Reporting Information [Line Items]
Contingent consideration adjustment			22,200
Semiconductor Test | Severance And Benefits
Segment Reporting Information [Line Items]
Restructuring and other-employee severance		11,013	8,731
Industrial Automation
Segment Reporting Information [Line Items]
Acquisition related costs	1,000	985	741
Cost of revenues-inventory charge	641	887	2,000
Restructuring and other-employee severance	1,210	1,584	796
Industrial Automation | Restructuring and other
Segment Reporting Information [Line Items]
Acquisition related costs	(513)	1,728
Industrial Automation | Severance And Benefits
Segment Reporting Information [Line Items]
Restructuring and other-employee severance			1,765
System Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	6,403	834	508
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	1,770	4,800	4,005
Corporate And Eliminations
Segment Reporting Information [Line Items]
Restructuring and other	13,971
Selling and administrative – equity modification charge		766	2,108
Investment impairment			15,000
Corporate And Eliminations | Restructuring and other
Segment Reporting Information [Line Items]
Other (income) expense, net—loss on convertible debt conversion	28,828
Corporate And Eliminations | Mobile Industrial Robots (MiR) | Restructuring and other
Segment Reporting Information [Line Items]
Restructuring and other-lease impairment		(3,546)	(22,199)
Contingent consideration adjustment	$ (7,227)	$ (19,724)	$ 2,976

Schedule of Revenues by Country

Schedule of Revenues by Country (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[1],[2]	$ 3,702,881	$ 3,121,469	$ 2,294,965
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	631,963	465,722	514,327
TAIWAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	1,117,874	1,178,068	485,681
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	392,626	321,674	333,059
KOREA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	502,167	391,571	239,504
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	259,954	205,587	219,015
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	166,231	143,983	175,322
THAILAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	138,812	138,787	87,503
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	121,582	76,460	84,111
MALAYSIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	136,774	56,096	58,200
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	166,838	68,887	54,560
Rest Of The World
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from unaffiliated customers	[2]	$ 68,060	$ 74,634	$ 43,683
[1]	Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2]	Revenues attributable to a country are based on location of customer site.

Schedule of Long-Lived Assets b

Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		$ 456,047	$ 449,369
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		308,438	291,234
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	[1]	$ 147,609	$ 158,135
[1]	As of December 31, 2021 and 2020, long-lived assets attributable to Singapore were $39.4 million and $62.5 million, respectively.

Schedule of Long-Lived Assets_2

Schedule of Long-Lived Assets by Geographic Area (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 456,047	$ 449,369
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 39,400	$ 62,500

Stock Repurchase Program - Addi

Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Jan. 01, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2022	Jan. 01, 2021	Jan. 01, 2020	Jan. 31, 2019
Stock Repurchase Programs [Line Items]
Cumulative repurchases, shares	10.9	4.8	1.5	32.5			1,000
Cumulative repurchases, value		$ 600	$ 88.5	$ 1,323	$ 750	$ 2,000
Common stock average price	$ 45.89	$ 125.74	$ 58.33	$ 40.68
Maximum
Stock Repurchase Programs [Line Items]
Cumulative repurchases, value								$ 500

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail)	1 Months Ended
	Jan. 31, 2022$ / shares
Subsequent Event [Line Items]
Cash Dividends payable, amount per share	$ 0.11
Cash Dividends payable, date to be paid	Mar. 18, 2022
Subsequent Event
Subsequent Event [Line Items]
Cash Dividends payable, record date	Feb. 18, 2022
Percentage of increase in cash dividend rate per share	10.00%

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 2,034	$ 1,736	$ 1,673
Additions Charged to Cost and Expenses	500	356	87
Other	(27)	32	28
Deductions	495	90	52
Balance at End of Period	2,012	2,034	1,736
Inventory Reserve
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	110,587	103,556	100,779
Additions Charged to Cost and Expenses	15,475	17,534	15,244
Other	1,335	(521)	(85)
Deductions	13,342	9,982	12,382
Balance at End of Period	114,055	110,587	103,556
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	84,962	77,177	69,852
Additions Charged to Cost and Expenses	13,502	7,785	7,325
Other	0	0
Deductions	1,294	0	0
Balance at End of Period	$ 97,170	$ 84,962	$ 77,177