Teradyne (TER) 10-Q 3 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	Apr. 29, 2024
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Fiscal Year Focus	2024
Entity Central Index Key	0000097210
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2024
Entity Registrant Name	TERADYNE, INC.
Entity Filer Category	Large Accelerated Filer
Trading Symbol	TER
Document Quarterly 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		156,111,885

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2024		Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 707,403		$ 757,571
Marketable securities		41,300		62,154
Accounts receivable, less allowance for credit losses of $1,947 and $1,988 at March 31, 2024 and December 31, 2023, respectively		426,333		422,124
Inventories, net	[1]	314,232		309,974
Prepayments	[2]	537,642		548,970
Other current assets		16,057		37,992
Current assets held for sale		22,426		23,250
Total current assets		2,065,393		2,162,035
Property, plant and equipment, net		457,248		445,492
Operating lease right-of-use assets, net		74,625		73,417
Marketable securities		121,905		117,434
Deferred tax assets		185,734		175,775
Retirement plans assets		11,449		11,504
Other assets		45,098		38,580
Acquired intangible assets, net		30,234		35,404
Goodwill		407,576		415,652
Long-term assets held for sale		11,458		11,531
Total assets		3,410,720	[3]	3,486,824
Current liabilities:
Accounts payable		153,873		180,131
Accrued employees' compensation and withholdings		121,144		191,750
Deferred revenue and customer advances		100,058		99,804
Other accrued liabilities		101,275		114,712
Operating lease liabilities		17,400		17,522
Income taxes payable		55,922		48,653
Current liabilities held for sale		4,687		7,379
Total current liabilities		554,359		659,951
Retirement plans liabilities		134,878		132,090
Long-term deferred revenue and customer advances		35,044		37,282
Long-term other accrued liabilities		16,653		19,998
Deferred tax liabilities		134		183
Long-term operating lease liabilities		65,554		65,092
Long-term incomes taxes payable		44,331		44,331
Long-term liabilities held for sale		1,938		2,000
Total liabilities		852,891		960,927
Commitments and contingencies (Note Q)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 153,757 and 152,698 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively		19,220		19,087
Additional paid-in capital		1,848,088		1,827,274
Accumulated other comprehensive loss		(39,739)		(26,978)
Retained earnings		730,260		706,514
Total shareholders' equity		2,557,829		2,525,897
Total liabilities and shareholders' equity		$ 3,410,720		$ 3,486,824
[1] Inventories, net at March 31, 2024 and December 31, 2023 excludes $ 19.3 million and $ 18.0 million , respectively, of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Assets held for sale" for additional information. Exclude s $ 3.2 million and $ 5.3 million at March 31, 2024 and December 31, 2023 , respectively, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Assets held for sale” for additional information. Total assets are attributable to each segment. Semiconductor Test includ es $ 33.9 million o f total assets classified as assets held for sale. See Note E: "Assets held for sale" for additional information. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts	$ 1,947	$ 1,988
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	153,757	152,698
Common stock, shares outstanding	153,757	152,698

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2024	Apr. 02, 2023
Revenues:
Total revenues	[1]	$ 599,819	$ 617,529
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		260,537	261,109
Gross profit		339,282	356,420
Operating expenses:
Selling and administrative		149,188	150,955
Engineering and development		103,199	105,762
Acquired intangible assets amortization		4,697	4,802
Restructuring and other		4,427	2,037
Total operating expenses		261,511	263,556
Income from operations		77,771	92,864
Non-operating (income) expense:
Interest income		(7,867)	(5,258)
Interest expense		661	987
Other (income) expense, net		12,075	51
Income before income taxes	[2],[3]	72,902	97,084
Income tax provision		8,705	13,553
Net income		$ 64,197	$ 83,531
Net income per common share:
Basic		$ 0.42	$ 0.54
Diluted		$ 0.4	$ 0.5
Weighted average common shares—basic		153,047	155,904
Weighted average common shares—diluted		162,348	166,308
Product [Member]
Revenues:
Total revenues		$ 458,433	$ 473,418
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		200,763	198,665
Service [Member]
Revenues:
Total revenues		141,386	144,111
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 59,774	$ 62,444
[1] Include s $ 0.9 million and $ 1.3 million in the three months ended March 31, 2024 and in the three months ended April 2, 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.” Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards. Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, and inventory charges.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 64,197	$ 83,531
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0 and $0, respectively	(11,457)	9,309
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(221) and $503, respectively	(902)	2,294
Less: Reclassification adjustment for losses included in net income, net of tax of $30 and $2, respectively	106	5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(796)	2,299
Cash flow hedges:
Unrealized gains arising during period, net of tax of $358 and $167, respectively	1,274	596
Less: Reclassification adjustment for losses included in net income, net of tax of $338 and $338 respectively	(1,780)	1,200
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	(506)	1,796
Defined benefit post-retirement plan:
Amortization of prior service credit, net of tax of $0 and $0, respectively	(2)	(2)
Other comprehensive income (loss)	(12,761)	13,402
Comprehensive income	$ 51,436	$ 96,933

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0
Unrealized gains (losses) on marketable securities arising during period, net of tax	(221)	503
Reclassification adjustment for losses (gains) included in net income, net of tax	30	2
Amortization of prior service credit, net of tax	0	0
Cash flow hedges Unrealized gains	358	167
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ (500)	$ 338

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at Dec. 31, 2022	$ 2,451,294	$ 19,470	$ 1,755,963	$ (49,868)	$ 725,729
Balance, Shares at Dec. 31, 2022		155,759,000
Net issuance of common stock under stock-based plans	(3,870)	$ 73	(3,943)
Net issuance of common stock under stock-based plans (in shares)		579,000
Stock-based compensation expense	20,332		20,332
Repurchase of common stock	(98,048)	$ (112)			(97,936)
Repurchase of common stock (in shares)		(893,000)
Cash dividends	(17,179)				(17,179)
Settlements of convertible notes	0	$ 41	(41)
Settlements of convertible notes (in shares)		324,000
Exercise of convertible notes hedge call options	0	$ (41)	41
Exercise of convertible notes hedge call options (in shares)		(324,000)
Net income	83,531				83,531
Other comprehensive income (loss)	13,402			13,402
Balance at Apr. 02, 2023	2,449,462	$ 19,431	1,772,352	(36,466)	694,145
Balance, Shares at Apr. 02, 2023		155,445,000
Balance at Dec. 31, 2023	2,525,897	$ 19,087	1,827,274	(26,978)	706,514
Balance, Shares at Dec. 31, 2023		152,698,000
Net issuance of common stock under stock-based plans	3,816	$ 58	3,758
Net issuance of common stock under stock-based plans (in shares)		466,000
Stock-based compensation expense	17,158		17,158
Warrant exercises		$ 102	(102)
Warrant exercises (in shares)		813
Repurchase of common stock	(22,095)	$ (27)			(22,068)
Repurchase of common stock (in shares)		(220,000)
Cash dividends	(18,383)				(18,383)
Net income	64,197				64,197
Other comprehensive income (loss)	(12,761)			(12,761)
Balance at Mar. 31, 2024	$ 2,557,829	$ 19,220	$ 1,848,088	$ (39,739)	$ 730,260
Balance, Shares at Mar. 31, 2024		153,757,000

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.12	$ 0.11

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Cash flows from operating activities:
Net income	$ 64,197	$ 83,531
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	23,354	22,680
Stock-based compensation	15,758	18,885
Provision for excess and obsolete inventory	6,177	5,610
Amortization	4,766	4,926
Deferred taxes	(9,669)	(7,634)
Losses (gains) on investments	10,466	(2,238)
Other	787	108
Changes in operating assets and liabilities
Accounts receivable	(8,055)	37,204
Inventories	(6,932)	(23,697)
Prepayments and other assets	11,089	(15,380)
Accounts payable and other liabilities	(105,548)	(83,208)
Deferred revenue and customer advances	(1,444)	(32,705)
Retirement plans contributions	(1,421)	(1,234)
Income taxes	3,754	12,488
Net cash provided by operating activities	7,279	19,336
Cash flows from investing activities:
Purchases of property, plant and equipment	(44,023)	(41,444)
Purchases of marketable securities	(16,042)	(69,276)
Proceeds from maturities of marketable securities	14,438	7,468
Proceeds from sales of marketable securities	20,734	7,929
Proceeds from insurance	873	460
Net cash used for investing activities	(24,020)	(94,863)
Cash flows from financing activities:
Repurchase of common stock	(22,117)	(93,308)
Dividend payments	(18,370)	(17,165)
Payments of convertible debt principal	0	(15,155)
Payments related to net settlement of employee stock compensation awards	(13,115)	(19,870)
Issuance of common stock under stock purchase and stock option plans	16,934	15,997
Net cash used for financing activities	(36,668)	(129,501)
Effects of exchange rate changes on cash and cash equivalents	3,241	(537)
Decrease in cash and cash equivalents	(50,168)	(205,565)
Cash and cash equivalents at beginning of period	757,571	854,773
Cash and cash equivalents at end of period	707,403	649,208
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 3,086	$ 3,823

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 64,197	$ 83,531

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024 shares
Richard Burns
Trading Arrangements, by Individual
Name	Richard Burns
Title	President
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	February 15, 2024
Rule 10b5-1 Arrangement Terminated	true
Termination Date	February 28, 2025
Mercedes Johnson
Trading Arrangements, by Individual
Name	Mercedes Johnson
Title	member of our Board of Directors
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	February 2, 2024
Rule 10b5-1 Arrangement Terminated	true
Termination Date	April 30, 2025
Aggregate Available	7,500

The Company

The Company	3 Months Ended
	Mar. 31, 2024
The Company	A. THE COMPANY Teradyne, Inc. (“Teradyne”) is a leading global supplier of automated test equipment and robotics solutions. Teradyne designs, develops, manufactures and sells automated test systems and robotics products. Teradyne’s automated test systems are 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 robotics products include collaborative robotic arms, autonomous mobile robots, and advanced robotic control software used by global manufacturing, logistics and industrial customers to improve quality, increase manufacturing and material handling efficiency and decrease manufacturing and logistics costs. Teradyne’s automated test equipment and robotics 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 • robotics (“Robotics”) products.

Accounting Policies

Accounting Policies	3 Months Ended
	Mar. 31, 2024
Accounting Policies	B. ACCOUNTING POLICIES Basis of Presentation The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. The December 31, 2023 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission (“SEC”) on February 22, 2024, for the year ended December 31, 2023 . 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. 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 Quarterly Report on Form 10-Q. 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.

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	3 Months Ended
	Mar. 31, 2024
Recently Issued Accounting Pronouncements	C. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In November 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures" , which will require Teradyne to disclose significant segment expenses and other segment items used by the Chief Operating Decision Maker ("CODM") on an annual and interim basis as well as provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. Additionally, Teradyne will be required to disclose the title and position of the CODM. The new standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. This ASU will have no impact on results of operations, cash flows or financial condition. Upon adoption, Teradyne will apply the amendments in this ASU retrospectively to all prior period disclosures presented in the financial statements. In December 2023, FASB issued ASU 2023-09 – “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” , which requires expanded disclosures relating to the tax rate reconciliation, income taxes paid, income (loss) before income tax expense (benefit) and income tax expense (benefit), requiring a greater disaggregation of information for each. The provisions of ASU 2023-09 are effective for fiscal years beginning after December 15, 2024. The amendments in this update should be applied on a prospective basis, but retrospective application is permitted. This ASU will have no impact on results of operations, cash flows or financial condition.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue	D. 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 System Test Robotics Wireless Test System Memory Universal Mobile Total (in thousands) For the Three Months Ended March 31, 2024 (1) Timing of Revenue Recognition Point in Time $ 229,592 $ 102,436 $ 58,073 $ 65,893 $ 19,290 $ 20,914 $ 496,198 Over Time 72,716 7,510 17,249 1,868 603 3,675 103,621 Total $ 302,308 $ 109,946 $ 75,322 $ 67,761 $ 19,893 $ 24,589 $ 599,819 Geographical Market Asia Pacific $ 270,567 $ 95,606 $ 25,781 $ 11,625 $ 2,954 $ 17,141 $ 423,674 Americas 22,551 9,052 36,594 20,005 14,625 5,824 108,651 Europe, Middle East and Africa 9,190 5,288 12,947 36,131 2,314 1,624 67,494 Total $ 302,308 $ 109,946 $ 75,322 $ 67,761 $ 19,893 $ 24,589 $ 599,819 For the Three Months Ended April 2, 2023 (1) Timing of Revenue Recognition Point in Time $ 273,275 $ 61,258 $ 56,857 $ 70,029 $ 15,959 $ 35,363 $ 512,741 Over Time 73,559 6,917 17,774 2,008 1,218 3,312 104,788 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ 617,529 Geographical Market Asia Pacific $ 283,259 $ 63,695 $ 39,590 $ 13,217 $ 1,502 $ 23,231 $ 424,494 Americas 41,568 2,944 28,980 20,447 11,806 12,846 118,591 Europe, Middle East and Africa 22,007 1,536 6,061 38,373 3,869 2,598 74,444 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ 617,529 (1) Include s $ 0.9 million and $ 1.3 million in the three months ended March 31, 2024 and in the three months ended April 2, 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.” Contract Balances During the three months ended March 31, 2024 and April 2, 2023, Teradyne recognized $ 28.2 million and $ 50.7 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 March 31, 2024, Teradyne had $ 1,075.2 million of unsatisfied performance obligations. Teradyne expects to recognize approximately 90 % of the remaining performance obligations in the next 12 months and the remainder in 1 - 3 years. Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet: March 31, December 31, (in thousands) Maintenance, service and training $ 61,404 $ 66,458 Customer advances, undelivered elements and other 39,189 35,731 Extended warranty 34,509 34,897 Total deferred revenue and customer advances $ 135,102 $ 137,086 Accounts Receivable During the three months ended March 31, 2024 and April 2, 2023, Teradyne sold certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. During the three months ended March 31, 2024 and April 2, 2023, total trade accounts receivable sold under the factoring agreements were $ 23.4 million and $ 34.2 million, respectively. Factoring fees for the sales of receivables were recorded in interest expense and were not material. Teradyne accounted for these transactions as sales of receivables and presented cash proceeds as cash provided by operating activities in the consolidated statements of cash flows.

Assets Held for Sale

Assets Held for Sale	3 Months Ended
	Mar. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Assets Held for Sale	E. ASSETS HELD FOR SALE On November 7, 2023, Teradyne entered into a definitive agreement to sell Teradyne’s Device Interface Solutions ("DIS") business, a component of the Semiconductor Test segment, to Technoprobe S.p.A. ("Technoprobe") for $ 85.0 million in cash. As a result, the related assets and liabilities met the criteria and were classified as held-for-sale in Teradyne’s consolidated balance sheet as of December 31, 2023. The transaction, which does not qualify as a strategic shift required for discontinued operations treatment, is expected to close in the second quarter of 2024, subject to regulatory approval. Assets held-for-sale is comprised of the following as of March 31, 2024 and December 31, 2023: March 31, December 31, (in thousands) Current assets: Inventories, net $ 19,276 $ 17,952 Prepayments 3,150 5,298 Total current assets held for sale 22,426 23,250 Property, plant and equipment, net 8,994 8,986 Operating lease right-of-use assets, net 2,464 2,545 Total assets held for sale $ 33,884 $ 34,781 Current liabilities: Accounts payable $ 3,954 $ 6,356 Other accrued liabilities 323 552 Operating lease liabilities 410 471 Total current liabilities held for sale 4,687 7,379 Long-term operating lease liabilities 1,938 2,000 Total liabilities held for sale $ 6,625 $ 9,379 Net assets held for sale $ 27,259 $ 25,402

Inventories

Inventories	3 Months Ended
	Mar. 31, 2024
Inventory Disclosure [Abstract]
Inventories	F. INVENTORIES Inventories, net consisted of the following at March 31, 2024 and December 31, 2023: March 31, December 31, (in thousands) Raw material $ 243,871 $ 258,422 Work-in-process 39,870 26,851 Finished goods 30,491 24,701 Total inventories, net (1) $ 314,232 $ 309,974 (1) Inventories, net at March 31, 2024 and December 31, 2023 excludes $ 19.3 million and $ 18.0 million , respectively, of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Assets held for sale" for additional information. Inventory reserves at March 31, 2024 and December 31, 2023 were $ 136.0 million and $ 136.0 million, respectively.

Financial Instruments

Financial Instruments	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Financial Instruments	G. 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’s equity and debt mutual funds are classified as Level 1 and available-for-sale debt securities are classified as Level 2. The vast majority of Level 2 securities are fixed income securities priced by third party pricing vendors. These pricing vendors utilize the most recent observable market information in pricing these securities or, if specific prices are not available, use other observable inputs like market transactions involving identical or comparable securities. During the three months ended March 31, 2024 and April 2, 2023, there were no transfers in or out of Level 1, Level 2, or Level 3 financial instruments. Realized gains recorded in the three months ended March 31, 2024 and April 2, 2023, were $ 1.0 million and $ 0.3 million, respectively. Realized losses recorded in the three months ended March 31, 2024 and April 2, 2023, were $ 0.2 million and $ 0.1 million, respectively. Realized gains and losses are included in other (income) expense, net. Unrealized gains on equity securities recorded in the three months ended March 31, 2024 and April 2, 2023 were $ 2.6 million and $ 2.0 million, respectively. Unrealized gains and losses on equity securities are included in other (income) expense, net. Unrealized gains and losses on available-for-sale debt securities are included in accumulated other comprehensive income (loss) on the balance sheet. 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 March 31, 2024 and December 31, 2023. March 31, 2024 Quoted Prices Significant Significant Total (in thousands) Assets Cash $ 278,229 $ — $ — $ 278,229 Cash equivalents 428,675 499 — 429,174 Available-for-sale securities: U.S. Treasury securities — 40,068 — 40,068 Corporate debt securities — 35,845 — 35,845 Certificates of deposit and time deposits — 21,706 — 21,706 Debt mutual funds 10,007 — — 10,007 U.S. government agency securities — 3,863 — 3,863 Commercial paper — 1,689 — 1,689 Non-U.S. government securities — 798 — 798 Equity securities: Mutual funds 49,229 — — 49,229 $ 766,140 $ 104,468 $ — $ 870,608 Derivative assets — 4,251 — 4,251 Total $ 766,140 $ 108,719 $ — $ 874,859 Liabilities Derivative liabilities — 936 — $ 936 Total $ — $ 936 $ — $ 936 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 706,904 $ 499 $ — $ 707,403 Marketable securities — 41,300 — 41,300 Long-term marketable securities 59,236 62,669 — 121,905 Prepayments — 4,251 — 4,251 Total $ 766,140 $ 108,719 $ — $ 874,859 Liabilities Other current liabilities $ — $ 936 $ — $ 936 Total $ — $ 936 $ — $ 936 December 31, 2023 Quoted Prices Significant Significant Total (in thousands) Assets Cash $ 298,156 $ — $ — $ 298,156 Cash equivalents 453,298 6,117 — 459,415 Available-for-sale securities: Corporate debt securities — 52,734 — 52,734 U.S. Treasury securities — 41,808 — 41,808 Certificates of deposit and time deposits — 21,772 — 21,772 Debt mutual funds 8,773 — — 8,773 U.S. government agency securities — 4,892 — 4,892 Commercial paper — 1,667 — 1,667 Non-U.S. government securities — 810 — 810 Equity securities: Mutual Funds 47,132 — — 47,132 $ 807,359 $ 129,800 $ — $ 937,159 Derivative assets — 18,746 — 18,746 Total $ 807,359 $ 148,546 $ — $ 955,905 Liabilities Derivative liabilities — 2,545 — 2,545 Total $ — $ 2,545 $ — $ 2,545 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 751,454 $ 6,117 $ — $ 757,571 Marketable securities — 62,154 — 62,154 Long-term marketable securities 55,905 61,529 — 117,434 Prepayments — 18,746 — 18,746 Total $ 807,359 $ 148,546 $ — $ 955,905 Liabilities Other current liabilities $ — $ 2,545 $ — $ 2,545 Total $ — $ 2,545 $ — $ 2,545 The carrying amounts and fair values of Teradyne’s financial instruments at March 31, 2024 and December 31, 2023, were as follows: March 31, 2024 December 31, 2023 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 707,403 $ 707,403 $ 757,571 $ 757,571 Marketable securities 163,205 163,205 179,588 179,588 Derivative assets 4,251 4,251 18,746 18,746 Liabilities Derivative liabilities 936 936 2,545 2,545 The fair values of accounts receivable, net and accounts payable approximate the carrying value due to the short-term nature of these instruments. The following table summarizes the composition of available-for-sale marketable securities at March 31, 2024: March 31, 2024 Available-for-Sale Cost Unrealized Unrealized Fair Fair Market (in thousands) Corporate debt securities $ 39,946 $ 89 $ ( 4,190 ) $ 35,845 $ 31,461 U.S. Treasury securities 44,519 1 ( 4,452 ) 40,068 38,914 Certificates of deposit and time deposits 21,706 — — 21,706 — Debt mutual funds 10,363 — ( 356 ) 10,007 3,303 U.S. government agency securities 3,883 — ( 20 ) 3,863 3,863 Commercial paper 1,670 19 — 1,689 — Non-U.S. government securities 798 — — 798 — $ 122,885 $ 109 $ ( 9,018 ) $ 113,976 $ 77,541 Reported as follows: Cost Unrealized Unrealized Fair Fair Market (in thousands) Marketable securities $ 41,308 $ 19 $ ( 27 ) $ 41,300 $ 17,657 Long-term marketable securities 81,577 90 ( 8,991 ) 72,676 59,884 $ 122,885 $ 109 $ ( 9,018 ) $ 113,976 $ 77,541 The following table summarizes the composition of available-for-sale marketable securities at December 31, 2023: December 31, 2023 Available-for-Sale Cost Unrealized Unrealized Fair Fair Market (in thousands) Corporate debt securities $ 56,458 $ 201 $ ( 3,925 ) $ 52,734 $ 44,263 U.S. Treasury securities 45,725 14 ( 3,931 ) 41,808 35,080 Certificates of deposit and time deposits 21,772 — — 21,772 — Debt mutual funds 9,081 — ( 308 ) 8,773 3,303 U.S. government agency securities 4,898 — ( 6 ) 4,892 4,892 Commercial paper 1,633 34 — 1,667 — Non-U.S. government securities 810 — — 810 — $ 140,377 $ 249 $ ( 8,170 ) $ 132,456 $ 87,538 Reported as follows: Cost Unrealized Unrealized Fair Fair Market (in thousands) Marketable securities $ 62,385 $ 36 $ ( 267 ) 62,154 $ 34,844 Long-term marketable securities 77,992 213 ( 7,903 ) 70,302 52,694 $ 140,377 $ 249 $ ( 8,170 ) $ 132,456 $ 87,538 As of March 31, 2024, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $ 36.2 million and $ 41.4 million, respectively. As of December 31, 2023, the fair market value of investments with unrealized losses for less than one year and greater than one year totaled $ 22.3 million and $ 65.2 million, respectively. 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 March 31, 2024 and December 31, 2023 were not other than temporary. The contractual maturities of investments in available-for-sale securities held at March 31, 2024, were as follows: March 31, 2024 Cost Fair Market (in thousands) Due within one year $ 41,308 $ 41,300 Due after 1 year through 5 years 26,360 25,819 Due after 5 years through 10 years 7,760 7,405 Due after 10 years 37,094 29,445 Total $ 112,522 $ 103,969 Contractual maturities of investments in available-for-sale securities held at March 31, 2024, exclude debt mutual funds with a fair market value of $ 10.0 million as they do not have a contractual maturity date. Derivatives Teradyne conducts business in various foreign countries, with certain transactions denominated in local currencies. As a result, Teradyne is exposed to risks relating to changes in foreign currency exchange rates. Teradyne’s foreign currency risk management objective is to minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, and changes in its cash inflows attributable to the forecasted cash flows from certain foreign currency denominated revenues. To minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, Teradyne enters into foreign currency forward contracts. The change in fair value of these derivatives is recorded directly in earnings and is used to offset the change in value of monetary assets and liabilities denominated in foreign currencies. Teradyne also enters into foreign currency forward and option contracts designated as cash flow hedges to hedge the risk of changes in its cash inflows attributable to changes in foreign currency exchange rates. The cash flow hedges have maturities of less than six months and mature in the period of revenue recognition for certain products and services in backlog and forecasted to be recognized in a future period. Teradyne evaluates cash flow hedges for effectiveness at inception based on the critical terms match method. The hedges are not expected to incur any ineffectiveness however a quarterly qualitative assessment of effectiveness is done to determine if the critical terms match method remains appropriate to use. The change in fair value of the contracts is recorded in accumulated other comprehensive income (loss) and reclassified to earnings at maturity date. Teradyne does not use derivative financial instruments for speculative purposes. At March 31, 2024 and December 31, 2023, 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: Net Notional Value March 31, December 31, (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Japanese yen $ 57.5 $ 11.0 U.S. dollar/Danish krone 28.4 36.0 U.S. dollar/Taiwan dollar 20.1 42.7 U.S. dollar/Korean won 6.6 7.2 U.S. dollar/British pound sterling 1.0 1.5 Euro/U.S. dollar 25.8 25.3 Singapore dollar/U.S. dollar 17.6 16.6 Philippine peso/U.S. dollar 9.9 10.1 Chinese yuan/U.S. dollar 0.6 1.0 Danish krone/U.S. dollar 0.6 0.7 Total $ 168.1 $ 152.1 The fair value of the outstanding contracts was a net loss of $ 0.1 million and a net loss of $ 1.8 million at March 31, 2024 and December 31, 2023, respectively. Unrealized 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. At March 31, 2024 and December 31, 2023, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. currencies for U.S. dollars with the following notional amounts: Net Notional Value March 31, December 31, (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Japanese yen $ — $ 35.5 Total $ — $ 35.5 There were no outstanding cash flow hedge contracts at March 31, 2024. The fair value of the outstanding cash flow hedge contracts was a gain of $ 0.6 million at December 31, 2023. Unrealized gains and losses on foreign currency cash flow hedge contracts are included in accumulated other comprehensive income (loss). At maturity, the gains or losses associated with cash flow hedge contracts are recorded to revenue. On November 7, 2023, in connection with our agreement to acquire 10 % investment in Technoprobe S.p.A we purchased a call option to buy 481.0 million Euros. The expiration date of the option is April 26, 2024 . On April 12, 2024, Teradyne entered into a forward to buy 481.0 million Euros expiring on May 23, 2024 . At March 31, 2024 and December 31, 2023, the fair value of the outstanding contract was $ 3.4 million and $ 17.4 million , respectively. For the three months ended March 31, 2024, an unrealized loss of $ 13.9 million was recorded in other (income) expense, net. The following table summarizes the fair value of derivative instruments as of March 31, 2024 and December 31, 2023: Balance Sheet Location March 31, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Other current assets $ 805 $ 733 Foreign exchange option contracts Other current assets 3,446 17,364 Foreign exchange forward contracts Other current liabilities ( 936 ) ( 2,545 ) Derivatives designated as hedging instruments: Foreign exchange forward contracts Other current assets — 648 Total derivatives $ 3,315 $ 16,200 The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three months ended March 31, 2024 and April 2, 2023: For the Three Months Location of (Gains) Losses March 31, April 2, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts (1) Other (income) expense, net $ ( 1,699 ) $ 1,259 Foreign exchange option contracts Other (income) expense, net 13,918 — Derivatives designated as hedging instruments: Foreign exchange forward and option contracts Revenue ( 2,280 ) 1,538 Total Derivatives $ 9,939 $ 2,797 (1) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three months ended March 31, 2024 and April 2, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 2.7 million and $ 0.4 million, respectively. See Note H: “Debt” regarding derivatives related to the convertible senior notes.

Debt

Debt	3 Months Ended
	Mar. 31, 2024
Debt	H. 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”) 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 bore interest at a rate of 1.25 % per year payable semiannually in arrears on June 15 and December 15 of each year . The Notes matured on December 15, 2023 . 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. 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. These transactions have been accounted for as an adjustment to our shareholders’ equity. The Warrant Transactions, which began expiring March 18, 2024 and will continue to expire through July 10, 2024 , currently cover, subject to customary anti-dilution adjustments, approximately 13.8 million shares of common stock. During the three months ended March 31, 2024, 0.8 million warrants expired. As of March 31, 2024 , the strike price of the warrants was approximately $ 39.37 per share. The strike price is subject to adjustment under certain circumstances. The Warrant Transactions c ould result in additional shares of Teradyne’s common stock being issued 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 interest expense on Teradyne's senior notes for three months ended April 2, 2023 was as follows: For the Three Months March 31, April 2, (in thousands) Contractual interest expense on the coupon $ — $ 138 Amortization of debt issuance fees recognized as interest expense — 113 Total interest expense on the convertible debt $ — $ 251 Revolving Credit Facility 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 provided 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 the maturity date of the Credit Facility to December 10, 2026. On October 5, 2022, the Credit Agreement was amended to increase the amount of the Credit Facility to $ 750.0 million from $ 400.0 million. The 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 to exceed 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 0.00 % to 0.75 % per annum or SOFR plus a margin ranging from 1.10 % to 1.85 % 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. 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 SOFR 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 Agreement also requires Teradyne to satisfy two financial ratios measured as of the end of each fiscal quarter: a consolidated leverage ratio and an interest coverage ratio. 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 May 3, 2024, the Credit Agreement was undrawn and Teradyne was in compliance with all covenants under the Credit Agreement.

Prepayments

Prepayments	3 Months Ended
	Mar. 31, 2024
Prepayments [Abstract]
Prepayments	I. PREPAYMENTS Prepayments consist of the following: March 31, December 31, (in thousands) Contract manufacturer and supplier prepayments $ 491,512 $ 502,257 Prepaid maintenance and other services 21,894 17,592 Prepaid taxes 14,335 16,083 Other prepayments 9,901 13,038 Total prepayments (1) $ 537,642 $ 548,970 (1) Exclude s $ 3.2 million and $ 5.3 million at March 31, 2024 and December 31, 2023 , respectively, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Assets held for sale” for additional information.

Product Warranty

Product Warranty	3 Months Ended
	Mar. 31, 2024
Product Warranty	J. 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. For the Three Months March 31, April 2, (in thousands) Balance at beginning of period $ 15,698 $ 14,181 Accruals for warranties issued during the period 3,259 4,117 Accruals related to pre-existing warranties ( 683 ) ( 405 ) Settlements made during the period ( 2,950 ) ( 4,992 ) Balance at end of period $ 15,324 $ 12,901 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. For the Three Months March 31, April 2, (in thousands) Balance at beginning of period $ 34,897 $ 56,180 Deferral of new extended warranty revenue 6,914 4,413 Recognition of extended warranty deferred revenue ( 7,302 ) ( 11,250 ) Balance at end of period $ 34,509 $ 49,343

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2024
Stock-Based Compensation	K. STOCK-BASED COMPENSATION On February 1, 2023 (the “Retirement Date”), Mark E. Jagiela retired as Chief Executive Officer of Teradyne and a member of Teradyne’s Board of Directors, and Teradyne entered into an agreement (the “Retirement Agreement”) with Mr. Jagiela. Under the Retirement Agreement, Mr. Jagiela’s unvested time-based restricted stock units and stock options granted prior to his Retirement Date were modified to allow continued vesting; and any vested options or options that vest during that period may be exercised for the remainder of the applicable option term. During the three months ended April 2, 2023 , Teradyne recorded a stock-based compensation expense of $ 5.9 million related to the Retirement Agreement. Under Teradyne’s stock compensation plans, Teradyne grants time-based restricted stock units, performance-based restricted stock units and 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-year period, with 100 % of the award vesting on the earlier of (a) the first anniversary of the grant date or (b) the date of the following year’s Annual Meeting of Shareholders. Teradyne expenses the cost of the restricted stock unit awards subject to time-based vesting, which is determined to be the fair market value of the shares at the date of grant, ratably over the period during which the restrictions lapse. 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 from operations less restructuring and other, net; amortization of acquired intangible assets; acquisition and divestiture related charges or credits; pension actuarial gains and losses; non-cash convertible debt interest expense; and other non-recurring gains and charges. The final number of PBIT PRSUs that vest will vary based upon the level of performance achieved from 0 % to 200 % of the target shares. The PBIT PRSUs will vest upon the three-year anniversary of the grant date. Compensation expense is recognized on a straight-line basis over the shorter of the three-year service period or the period from the grant date 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 based on the number of units that are earned based upon the three-year Teradyne PBIT as a percent of Teradyne’s revenue, provided the executive officer remains an employee at the end of the three-year period subject to the retirement and termination eligibility provisions noted below. 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 and at least ten years of service, then all or a portion of the recipient’s PRSUs (based on the actual performance percentage achieved on the determination date) will vest on the date the performance percentage is determined. Except as set forth in the preceding sentence, no PRSUs will vest if the executive officer is no longer an employee at the end of the three-year period. Stock options to purchase Teradyne’s common stock at 100 % of the fair market value on the grant date vest in equal annual installments over four years from the grant date and have a maximum term of seven years . On January 22, 2024, the Board enacted the Executive Retirement Policy for Restricted Stock Unit and Option Vesting (the "Retirement Policy"). Under the Retirement Policy, an executive officer that is over the age of 65 and has 10 or more years of service as of the effective date of his or her retirement will be eligible for continued vesting of his or her unvested time-based restricted stock units and stock options granted prior to his or her retirement date. During the three months ended March 31, 2024 and April 2, 2023, Teradyne granted 0.5 million and 0.5 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $ 94.28 and $ 102.36 , respectively. During the three months ended March 31, 2024 and April 2, 2023, Teradyne granted 0.1 million and 0.1 million of PBIT PRSUs with a grant date fair value of $ 94.01 and $ 102.23 , respectively. During the three months ended March 31, 2024 and April 2, 2023, Teradyne granted 0.1 million and 0.1 million of TSR PRSUs, with a grant date fair value of $ 100.87 and $ 137.64 , respectively. The fair value was estimated using the Monte Carlo simulation model with the following assumptions: For the Three Months March 31, April 2, Risk-free interest rate 3.9 % 3.9 % Teradyne volatility-historical 42.4 % 50.2 % NYSE Composite Index volatility-historical 15.6 % 24.8 % Dividend yield 0.5 % 0.4 % Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index over the most recent three-year period. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Dividend yield was based upon an estimated annual dividend amount of $ 0.48 per share divided by Teradyne’s stock price on the grant date of $ 95.14 for the 2024 grant, and an estimated annual dividend amount of $ 0.44 per share divided by Teradyne’s stock price on the grant date of $ 103.44 for the 2023 grant. During the three months ended March 31, 2024 and April 2, 2023, Teradyne granted 0.1 million and 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $ 37.50 and $ 40.90 , respectively. The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions: For the Three Months March 31, April 2, Expected life (years) 4.0 4.0 Risk-free interest rate 4.0 % 3.7 % Volatility-historical 46.3 % 46.7 % Dividend yield 0.5 % 0.4 % 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 $ 0.48 per share divided by Teradyne’s stock price on the grant date of $ 95.14 for the 2024 grant and an estimated annual dividend amount of $ 0.44 per share divided by Teradyne’s stock price on the grant date of $ 103.44 for the 2023 grant.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss)	L. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following: Foreign Unrealized Unrealized (Losses) Gains on Cash Flow Hedges Retirement Total (in thousands) Three Months Ended March 31, 2024 Balance at December 31, 2023, net of tax of $ 0 , $( 1,728 ), 142 , $( 1,132 ), respectively $ ( 22,442 ) $ ( 6,194 ) $ 506 $ 1,152 $ ( 26,978 ) Other comprehensive (loss) gain before reclassifications, 0 , $( 221 ), $ 358 , $ 0 , respectively ( 11,457 ) ( 902 ) 1,274 — ( 11,085 ) Amounts reclassified from accumulated other comprehensive 0 , $ 30 , $( 500 ), $ 0 , respectively — 106 ( 1,780 ) ( 2 ) ( 1,676 ) Net current period other comprehensive loss, net of tax 0 , $( 191 ), $( 142 ), $ 0 , respectively ( 11,457 ) ( 796 ) ( 506 ) ( 2 ) ( 12,761 ) Balance at March 31, 2024, net of tax of $ 0 , $( 1,919 ), 0 , $( 1,132 ), respectively $ ( 33,899 ) $ ( 6,990 ) $ — $ 1,150 $ ( 39,739 ) Three Months Ended April 2, 2023 Balance at December 31, 2022, net of tax of $ 0 , $( 2,308 ), 708 ), $( 1,130 ), respectively $ ( 39,849 ) $ ( 8,661 ) $ ( 2,517 ) $ 1,159 $ ( 49,868 ) Other comprehensive gain before reclassifications, 0 , $ 503 , $ 167 , $ 0 , respectively 9,309 2,294 596 — 12,199 Amounts reclassified from accumulated other comprehensive 0 , $ 2 , $ 338 , $ 0 , respectively — 5 1,200 ( 2 ) 1,203 Net current period other comprehensive gain (loss), net of tax 0 , $ 505 , $ 505 , $ 0 , respectively 9,309 2,299 1,796 ( 2 ) 13,402 Balance at April 2, 2023, net of tax of $ 0 , $( 1,803 ), 203 ), $( 1,130 ), respectively $ ( 30,540 ) $ ( 6,362 ) $ ( 721 ) $ 1,157 $ ( 36,466 ) Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended March 31, 2024 and April 2, 2023, were as follows: Details about Accumulated Other Comprehensive Income (Loss) Components For the Three Months Affected Line Item March 31, April 2, (in thousands) Available-for-sale marketable securities: Unrealized losses, net of tax of $( 30 ), $( 2 ), respectively $ ( 106 ) $ ( 5 ) Other (income) expense, net Cash flow hedges: Unrealized (losses) gains, net of tax of $ 500 , $( 338 ), respectively 1,780 ( 1,200 ) Revenue Defined benefit pension and postretirement plans: Amortization of prior service credit, net of tax of $ 0 , $ 0 , 2 2 (a) Total reclassifications, net of tax of $ 470 , $( 340 ), respectively $ 1,676 $ ( 1,203 ) Net income (a) The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note P: “Retirement Plans.”

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	3 Months Ended
	Mar. 31, 2024
Goodwill and Acquired Intangible Assets	M. GOODWILL AND ACQUIRED INTANGIBLE ASSETS Goodwill Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “Intangibles—Goodwill and Other” on December 31 of each fiscal year unless interim indicators of impairment exist. In the three months ended March 31, 2024, there were no interim indicators of impairment. Goodwill is considered impaired when the net book value of a reporting unit exceeds its estimated fair value. The changes in the carrying amount of goodwill by reportable segments for the three months ended March 31, 2024, were as follows: Robotics Wireless Semiconductor System Total (in thousands) Balance at December 31, 2023 Goodwill $ 395,463 $ 361,819 $ 262,237 $ 158,699 $ 1,178,218 Accumulated impairment losses — ( 353,843 ) ( 260,540 ) ( 148,183 ) ( 762,566 ) Total Goodwill 395,463 7,976 1,697 10,516 415,652 Foreign currency translation adjustment ( 7,962 ) — ( 114 ) — ( 8,076 ) Balance at March 31, 2024 Goodwill $ 387,502 $ 361,819 $ 262,123 $ 158,699 1,170,142 Accumulated impairment losses — ( 353,843 ) ( 260,540 ) ( 148,183 ) ( 762,566 ) Total Goodwill $ 387,502 $ 7,976 $ 1,583 $ 10,516 $ 407,576 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. Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: Gross Accumulated Foreign Net (in thousands) Balance at March 31, 2024 Developed technology $ 267,706 $ ( 246,266 ) $ ( 5,635 ) $ 15,805 Customer relationships 52,109 ( 48,278 ) 203 4,034 Tradenames and trademarks 59,007 ( 47,231 ) ( 1,381 ) 10,395 Total intangible assets $ 378,822 $ ( 341,775 ) $ ( 6,813 ) $ 30,234 Balance at December 31, 2023 Developed technology $ 267,706 $ ( 243,191 ) $ ( 5,343 ) $ 19,172 Customer relationships 52,109 ( 47,850 ) 232 4,491 Tradenames and trademarks 59,007 ( 46,021 ) ( 1,245 ) 11,741 Total intangible assets $ 378,822 $ ( 337,062 ) $ ( 6,356 ) $ 35,404 Aggregate intangible asset amortization expense was $ 4.7 million and $ 4.8 million, respectively, for the three months ended March 31, 2024 and April 2, 2023. Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows: Year Amortization (in thousands) 2024 $ 14,010 2025 11,290 2026 2,364 2027 1,148 2028 1,066 Thereafter 356

Net Income Per Common Share

Net Income Per Common Share	3 Months Ended
	Mar. 31, 2024
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: For the Three Months March 31, April 2, (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 64,197 $ 83,531 Weighted average common shares-basic 153,047 155,904 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 8,862 8,983 Incremental shares from assumed conversion of convertible notes (2) — 914 Restricted stock units 419 453 Stock options 16 48 Employee stock purchase plan 4 6 Dilutive potential common shares 9,301 10,404 Weighted average common shares-diluted 162,348 166,308 Net income per common share-basic $ 0.42 $ 0.54 Net income per common share-diluted $ 0.40 $ 0.50 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant 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 assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period. The computation of diluted net income per common share for the three months ended March 31, 2024 and April 2, 2023, excludes the effect of the potential vesting of 0.4 million and 0.5 million, respectively, of restricted stock units because the effect would have been anti-dilutive.

Restructuring and Other

Restructuring and Other	3 Months Ended
	Mar. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring and Other	O. RESTRUCTURING AND OTHER During the three months ended March 31, 2024 , Teradyne recorded $ 2.2 million of acquisition and divestiture expenses related to the Technoprobe transaction, and $ 2.0 million of severance charges related to headcount reductions primarily in Robotics and Semiconductor Test, which included charges related to a voluntary early retirement program for employees meeting certain conditions. During the three months ended April 2, 2023 , Teradyne recorded a charge of $ 2.0 million of severance charges related to headcount reductions primarily in Semiconductor Test, Robotics, and Corporate.

Retirement Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2024
Retirement Plans	P. RETIREMENT PLANS ASC 715, “Compensation—Retirement Benefits,” requires an employer with defined benefit plans or other postretirement benefit plans to recognize an asset or a liability on its balance sheet for the overfunded or underfunded status of the plans as defined by ASC 715. The pension asset or liability represents a difference between the fair value of the pension plan’s assets and the projected benefit obligation at December 31. Teradyne uses a December 31 measurement date for all its plans. Defined Benefit Pension Plans Teradyne has defined benefit pension plans covering a portion of domestic employees and employees of certain non-U.S. subsidiaries. Benefits under these plans are based on employees’ years of service and compensation. Teradyne’s funding policy is to make contributions to these plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of the U.S. qualified pension plan 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 the three months ended March 31, 2024 and April 2, 2023, Teradyne contributed $ 0.8 million and $ 0.8 million, respectively, to the U.S. supplemental executive defined benefit pension plan, and $ 0.3 million and $ 0.2 million, respectively, to certain qualified pension plans for non-U.S. subsidiaries. For the three months ended March 31, 2024 and April 2, 2023, Teradyne’s net periodic pension cost was comprised of the following: For the Three Months Ended March 31, 2024 April 2, 2023 United Foreign United Foreign (in thousands) Service cost $ 231 $ 117 $ 272 $ 109 Interest cost 1,647 246 1,711 262 Expected return on plan assets ( 1,268 ) ( 16 ) ( 1,285 ) ( 9 ) Total net periodic pension cost $ 610 $ 347 $ 698 $ 362 Postretirement Benefit Plan In addition to receiving pension benefits, Teradyne employees in the United States 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. During the three months ended March 31, 2024, Teradyne recorded special termination benefit charges associated with a voluntary early retirement program. For the three months ended March 31, 2024 and April 2, 2023, Teradyne’s net periodic postretirement benefit cost was comprised of the following: For the Three Months March 31, April 2, (in thousands) Service cost $ 10 $ 9 Interest cost 73 61 Amortization of prior service credit ( 2 ) ( 2 ) Special termination benefits 292 — Total net periodic postretirement benefit cost $ 373 $ 68

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies	Q. COMMITMENTS AND CONTINGENCIES Purchase Commitments As of March 31, 2024 , Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $ 428.8 million, of which $ 404.7 million is for less than one year. Legal Claims Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business 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. 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 March 31, 2024 and December 31, 2023, Teradyne had a product warranty accrual of $ 15.3 million and $ 15.7 million, respectively, included in other accrued liabilities and revenue deferrals related to extended warranties of $ 34.5 million and $ 34.9 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 March 31, 2024 and December 31, 2023 , except for product warranty, Teradyne has not recorded any liabilities for these guarantees and obligations because the amount would be immaterial.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2024
Income Taxes	R. INCOME TAXES A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows: For the Three Months March 31, April 2, U.S. statutory federal tax rate 21.0 % 21.0 % Tax credits ( 3.1 ) ( 2.5 ) Discrete benefit related to reserves for uncertain tax positions ( 3.1 ) — International provisions of the U.S. Tax Cuts and Jobs Act of 2017 ( 2.2 ) ( 3.2 ) Foreign taxes ( 2.1 ) ( 0.6 ) Discrete benefit related to equity compensation ( 0.9 ) ( 3.3 ) Other, net 2.3 2.6 Effective tax rate 11.9 % 14.0 % On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of March 31, 2024, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not that the deferred tax assets would not be realized, the tax provision would increase in the period in which Teradyne determined that the realizability was not likely. Teradyne considers the probability of future taxable income and historical profitability, among other factors, in assessing the realizability of the deferred tax assets. As of March 31, 2024 and December 31, 2023, Teradyne had $ 15.9 million and $ 18.6 million, respectively, of reserves for uncertain tax positions. The $ 2.7 million net decrease in reserves for uncertain tax positions is related to the settlement of an audit. As of March 31, 2024, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $ 0.8 million in the next twelve months because of a lapse of statutes of limitation. The estimated decrease relates to U.S. federal and state research and development credits. Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of March 31, 2024 and December 31, 2023, $ 0.7 million and $ 1.3 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the three months ended March 31, 2024 and April 2, 2023, benefit of $ 0.6 million and expense of $ 0.1 million, respectively, was recorded for interest and penalties related to income tax items. Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the three months ended March 31, 2024, was $ 1.1 million, or $ 0.01 per diluted share. The tax savings due to the tax holiday for the three months ended April 2, 2023, was $ 0.2 million, or $ 0.0 per diluted share. 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. On August 16, 2022, the Inflation Reduction Act of 2022 (“IRA”) was signed into law. The IRA introduced a 15 % alternative minimum tax based on the financial statement income of certain large corporations (“CAMT”), effective January 1, 2023. Teradyne currently does not expect the CAMT to have a material impact on its financial results. On December 15, 2022, the European Union ("EU") Member States formally adopted the EU’s Pillar Two Directive, which generally provides for a minimum effective tax rate of 15 %, as established by the Organization for Economic Co-operation and Development ("OECD") Pillar Two Framework. The EU’s Pillar Two Directive effective dates are January 1, 2024, and January 1, 2025, for different aspects of the directive. On July 17, 2023, the OECD published Administrative Guidance proposing certain safe harbor rules that effectively extend certain effective dates to January 1, 2027. Certain EU Member States where Teradyne has a legal presence have recently enacted the directive and administrative guidance into their local tax legislation. Additionally, countries outside the EU where Teradyne has a legal presence have enacted similar language as the EU Members States in their local tax legislation. Teradyne is closely monitoring these developments and evaluating the potential financial impact on income tax expense. As of March 31, 2024, Teradyne anticipates it will meet the safe harbors in most jurisdictions, and any remaining tax under the rules should be immaterial for the year ending December 31, 2024.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Information	S. SEGMENT INFORMATION Teradyne has four reportable segments (Semiconductor Test, System Test, Wireless Test and Robotics). Each of the reportable segments represents an individual operating segment. 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 Robotics segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms, autonomous mobile robots and advanced robotic control software. Each operating segment has a segment manager who is accountable to and maintains regular contract with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts, and plans for the segment. Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies” in Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2023. Segment information for the three months ended March 31, 2024 and April 2, 2023 is as follows: Semiconductor System Robotics Wireless Segment Total Corporate Consolidated (in thousands) Three Months Ended March 31, 2024 Revenues $ 412,254 $ 75,322 $ 87,654 $ 24,589 $ 599,819 $ — $ 599,819 Income (loss) before income taxes (1)(2) 79,414 18,391 ( 14,047 ) ( 893 ) $ 82,865 ( 9,963 ) $ 72,902 Total assets (3) 1,348,829 181,803 721,318 69,519 $ 2,321,469 1,089,251 $ 3,410,720 Three Months Ended April 2, 2023 Revenues $ 415,009 $ 74,631 $ 89,214 $ 38,675 $ 617,529 $ — $ 617,529 Income (loss) before income taxes (1)(2) 96,185 15,275 ( 18,490 ) 9,352 $ 102,322 ( 5,238 ) $ 97,084 Total assets (3) 1,386,851 173,669 676,092 87,875 $ 2,324,487 1,058,920 $ 3,383,407 (1) Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards. (2) Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, and inventory charges. (3) Total assets are attributable to each segment. Semiconductor Test includ es $ 33.9 million o f total assets classified as assets held for sale. See Note E: "Assets held for sale" for additional information. 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 Three Months March 31, April 2, (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ 4,956 $ 3,768 Restructuring and other—employee severance 983 794 System Test: Cost of revenues—inventory charge $ — $ 675 Robotics: Cost of revenues—inventory charge $ — $ 782 Corporate and Eliminations: Restructuring and other—acquisition & divestiture related expenses 2,214 — Selling and administrative —equity modification 1,469 5,889 Restructuring and other—employee severance $ — $ 659

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Shareholders' Equity	T. SHAREHOLDERS’ EQUITY Stock Repurchase Program In January 2023, Teradyne’s Board of Directors cancelled its January 2021 repurchase program and approved a new repurchase program for up to $ 2.0 billion of common stock. As of January 1, 2023, share repurchases in excess of issuances are subject to a 1 % excise tax, which is included as part of the cost basis of the shares acquired. Teradyne intends to repurchase up to $ 90.0 million of its common stock in 2024 based on market conditions. During the three months ended March 31, 2024 , Teradyne repurchased 0.2 million shares of common stock for a total cost of $ 22.1 million at an average price of $ 100.31 per share. The cumulative repurchases under the January 2023 repurchase program as of March 31, 2024 were 4.1 million shares of common stock for $ 422.6 million at an average price per share of $ 102.35 . During the three months ended April 2, 2023 , Teradyne repurchased 0.9 million shares of common stock for $ 93.7 million at an average price of $ 104.88 per share. The total cost of shares acquired includes commissions and related excise tax, and is recorded as a reduction to retained earnings. Dividend Holders of Teradyne’s common stock are entitled to receive dividends when they are declared by Teradyne’s Board of Directors. In January 2024 and January 2023, Teradyne’s Board of Directors declared a quarterly cash dividend of $ 0.12 per share and $ 0.11 per share, respectively. Dividend payments for the three months ended March 31, 2024 and April 2, 2023, were $ 18.4 million and $ 17.2 million , respectively.

Accounting Policies (Policies)

Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Basis of Presentation	Basis of Presentation The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. The December 31, 2023 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission (“SEC”) on February 22, 2024, for the year ended December 31, 2023 .
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. 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 Quarterly Report on Form 10-Q. 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 (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2024
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 System Test Robotics Wireless Test System Memory Universal Mobile Total (in thousands) For the Three Months Ended March 31, 2024 (1) Timing of Revenue Recognition Point in Time $ 229,592 $ 102,436 $ 58,073 $ 65,893 $ 19,290 $ 20,914 $ 496,198 Over Time 72,716 7,510 17,249 1,868 603 3,675 103,621 Total $ 302,308 $ 109,946 $ 75,322 $ 67,761 $ 19,893 $ 24,589 $ 599,819 Geographical Market Asia Pacific $ 270,567 $ 95,606 $ 25,781 $ 11,625 $ 2,954 $ 17,141 $ 423,674 Americas 22,551 9,052 36,594 20,005 14,625 5,824 108,651 Europe, Middle East and Africa 9,190 5,288 12,947 36,131 2,314 1,624 67,494 Total $ 302,308 $ 109,946 $ 75,322 $ 67,761 $ 19,893 $ 24,589 $ 599,819 For the Three Months Ended April 2, 2023 (1) Timing of Revenue Recognition Point in Time $ 273,275 $ 61,258 $ 56,857 $ 70,029 $ 15,959 $ 35,363 $ 512,741 Over Time 73,559 6,917 17,774 2,008 1,218 3,312 104,788 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ 617,529 Geographical Market Asia Pacific $ 283,259 $ 63,695 $ 39,590 $ 13,217 $ 1,502 $ 23,231 $ 424,494 Americas 41,568 2,944 28,980 20,447 11,806 12,846 118,591 Europe, Middle East and Africa 22,007 1,536 6,061 38,373 3,869 2,598 74,444 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ 617,529 (1) Include s $ 0.9 million and $ 1.3 million in the three months ended March 31, 2024 and in the three months ended April 2, 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
Deferred Revenue and Customer Advances	Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet: March 31, December 31, (in thousands) Maintenance, service and training $ 61,404 $ 66,458 Customer advances, undelivered elements and other 39,189 35,731 Extended warranty 34,509 34,897 Total deferred revenue and customer advances $ 135,102 $ 137,086

Assets Held for Sale (Tables)

Assets Held for Sale (Tables)	3 Months Ended
	Mar. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Assets Held-for-sale	Assets held-for-sale is comprised of the following as of March 31, 2024 and December 31, 2023: March 31, December 31, (in thousands) Current assets: Inventories, net $ 19,276 $ 17,952 Prepayments 3,150 5,298 Total current assets held for sale 22,426 23,250 Property, plant and equipment, net 8,994 8,986 Operating lease right-of-use assets, net 2,464 2,545 Total assets held for sale $ 33,884 $ 34,781 Current liabilities: Accounts payable $ 3,954 $ 6,356 Other accrued liabilities 323 552 Operating lease liabilities 410 471 Total current liabilities held for sale 4,687 7,379 Long-term operating lease liabilities 1,938 2,000 Total liabilities held for sale $ 6,625 $ 9,379 Net assets held for sale $ 27,259 $ 25,402

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2024
Composition of Inventories, Net	Inventories, net consisted of the following at March 31, 2024 and December 31, 2023: March 31, December 31, (in thousands) Raw material $ 243,871 $ 258,422 Work-in-process 39,870 26,851 Finished goods 30,491 24,701 Total inventories, net (1) $ 314,232 $ 309,974 (1) Inventories, net at March 31, 2024 and December 31, 2023 excludes $ 19.3 million and $ 18.0 million , respectively, of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Assets held for sale" for additional information.

Financial Instruments (Tables)

Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 and December 31, 2023. March 31, 2024 Quoted Prices Significant Significant Total (in thousands) Assets Cash $ 278,229 $ — $ — $ 278,229 Cash equivalents 428,675 499 — 429,174 Available-for-sale securities: U.S. Treasury securities — 40,068 — 40,068 Corporate debt securities — 35,845 — 35,845 Certificates of deposit and time deposits — 21,706 — 21,706 Debt mutual funds 10,007 — — 10,007 U.S. government agency securities — 3,863 — 3,863 Commercial paper — 1,689 — 1,689 Non-U.S. government securities — 798 — 798 Equity securities: Mutual funds 49,229 — — 49,229 $ 766,140 $ 104,468 $ — $ 870,608 Derivative assets — 4,251 — 4,251 Total $ 766,140 $ 108,719 $ — $ 874,859 Liabilities Derivative liabilities — 936 — $ 936 Total $ — $ 936 $ — $ 936 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 706,904 $ 499 $ — $ 707,403 Marketable securities — 41,300 — 41,300 Long-term marketable securities 59,236 62,669 — 121,905 Prepayments — 4,251 — 4,251 Total $ 766,140 $ 108,719 $ — $ 874,859 Liabilities Other current liabilities $ — $ 936 $ — $ 936 Total $ — $ 936 $ — $ 936 December 31, 2023 Quoted Prices Significant Significant Total (in thousands) Assets Cash $ 298,156 $ — $ — $ 298,156 Cash equivalents 453,298 6,117 — 459,415 Available-for-sale securities: Corporate debt securities — 52,734 — 52,734 U.S. Treasury securities — 41,808 — 41,808 Certificates of deposit and time deposits — 21,772 — 21,772 Debt mutual funds 8,773 — — 8,773 U.S. government agency securities — 4,892 — 4,892 Commercial paper — 1,667 — 1,667 Non-U.S. government securities — 810 — 810 Equity securities: Mutual Funds 47,132 — — 47,132 $ 807,359 $ 129,800 $ — $ 937,159 Derivative assets — 18,746 — 18,746 Total $ 807,359 $ 148,546 $ — $ 955,905 Liabilities Derivative liabilities — 2,545 — 2,545 Total $ — $ 2,545 $ — $ 2,545 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 751,454 $ 6,117 $ — $ 757,571 Marketable securities — 62,154 — 62,154 Long-term marketable securities 55,905 61,529 — 117,434 Prepayments — 18,746 — 18,746 Total $ 807,359 $ 148,546 $ — $ 955,905 Liabilities Other current liabilities $ — $ 2,545 $ — $ 2,545 Total $ — $ 2,545 $ — $ 2,545
Schedule of Carrying Amounts and Fair Values of Financial Instruments	The carrying amounts and fair values of Teradyne’s financial instruments at March 31, 2024 and December 31, 2023, were as follows: March 31, 2024 December 31, 2023 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 707,403 $ 707,403 $ 757,571 $ 757,571 Marketable securities 163,205 163,205 179,588 179,588 Derivative assets 4,251 4,251 18,746 18,746 Liabilities Derivative liabilities 936 936 2,545 2,545
Schedule of Available-for-Sale Marketable Securities	The following table summarizes the composition of available-for-sale marketable securities at March 31, 2024: March 31, 2024 Available-for-Sale Cost Unrealized Unrealized Fair Fair Market (in thousands) Corporate debt securities $ 39,946 $ 89 $ ( 4,190 ) $ 35,845 $ 31,461 U.S. Treasury securities 44,519 1 ( 4,452 ) 40,068 38,914 Certificates of deposit and time deposits 21,706 — — 21,706 — Debt mutual funds 10,363 — ( 356 ) 10,007 3,303 U.S. government agency securities 3,883 — ( 20 ) 3,863 3,863 Commercial paper 1,670 19 — 1,689 — Non-U.S. government securities 798 — — 798 — $ 122,885 $ 109 $ ( 9,018 ) $ 113,976 $ 77,541 Reported as follows: Cost Unrealized Unrealized Fair Fair Market (in thousands) Marketable securities $ 41,308 $ 19 $ ( 27 ) $ 41,300 $ 17,657 Long-term marketable securities 81,577 90 ( 8,991 ) 72,676 59,884 $ 122,885 $ 109 $ ( 9,018 ) $ 113,976 $ 77,541 The following table summarizes the composition of available-for-sale marketable securities at December 31, 2023: December 31, 2023 Available-for-Sale Cost Unrealized Unrealized Fair Fair Market (in thousands) Corporate debt securities $ 56,458 $ 201 $ ( 3,925 ) $ 52,734 $ 44,263 U.S. Treasury securities 45,725 14 ( 3,931 ) 41,808 35,080 Certificates of deposit and time deposits 21,772 — — 21,772 — Debt mutual funds 9,081 — ( 308 ) 8,773 3,303 U.S. government agency securities 4,898 — ( 6 ) 4,892 4,892 Commercial paper 1,633 34 — 1,667 — Non-U.S. government securities 810 — — 810 — $ 140,377 $ 249 $ ( 8,170 ) $ 132,456 $ 87,538 Reported as follows: Cost Unrealized Unrealized Fair Fair Market (in thousands) Marketable securities $ 62,385 $ 36 $ ( 267 ) 62,154 $ 34,844 Long-term marketable securities 77,992 213 ( 7,903 ) 70,302 52,694 $ 140,377 $ 249 $ ( 8,170 ) $ 132,456 $ 87,538
Contractual Maturities of Investments Held	The contractual maturities of investments in available-for-sale securities held at March 31, 2024, were as follows: March 31, 2024 Cost Fair Market (in thousands) Due within one year $ 41,308 $ 41,300 Due after 1 year through 5 years 26,360 25,819 Due after 5 years through 10 years 7,760 7,405 Due after 10 years 37,094 29,445 Total $ 112,522 $ 103,969
Schedule of Notional Amount of Derivatives	At March 31, 2024 and December 31, 2023, 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: Net Notional Value March 31, December 31, (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Japanese yen $ 57.5 $ 11.0 U.S. dollar/Danish krone 28.4 36.0 U.S. dollar/Taiwan dollar 20.1 42.7 U.S. dollar/Korean won 6.6 7.2 U.S. dollar/British pound sterling 1.0 1.5 Euro/U.S. dollar 25.8 25.3 Singapore dollar/U.S. dollar 17.6 16.6 Philippine peso/U.S. dollar 9.9 10.1 Chinese yuan/U.S. dollar 0.6 1.0 Danish krone/U.S. dollar 0.6 0.7 Total $ 168.1 $ 152.1
Schedule of Foreign Currency Cash Flow Hedges	At March 31, 2024 and December 31, 2023, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. currencies for U.S. dollars with the following notional amounts: Net Notional Value March 31, December 31, (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Japanese yen $ — $ 35.5 Total $ — $ 35.5
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value	The following table summarizes the fair value of derivative instruments as of March 31, 2024 and December 31, 2023: Balance Sheet Location March 31, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Other current assets $ 805 $ 733 Foreign exchange option contracts Other current assets 3,446 17,364 Foreign exchange forward contracts Other current liabilities ( 936 ) ( 2,545 ) Derivatives designated as hedging instruments: Foreign exchange forward contracts Other current assets — 648 Total derivatives $ 3,315 $ 16,200
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized	The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three months ended March 31, 2024 and April 2, 2023: For the Three Months Location of (Gains) Losses March 31, April 2, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts (1) Other (income) expense, net $ ( 1,699 ) $ 1,259 Foreign exchange option contracts Other (income) expense, net 13,918 — Derivatives designated as hedging instruments: Foreign exchange forward and option contracts Revenue ( 2,280 ) 1,538 Total Derivatives $ 9,939 $ 2,797 (1) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three months ended March 31, 2024 and April 2, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 2.7 million and $ 0.4 million, respectively.

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2024
Schedule of Interest Expense on Teradyne's Senior Notes	The interest expense on Teradyne's senior notes for three months ended April 2, 2023 was as follows: For the Three Months March 31, April 2, (in thousands) Contractual interest expense on the coupon $ — $ 138 Amortization of debt issuance fees recognized as interest expense — 113 Total interest expense on the convertible debt $ — $ 251

Prepayments (Tables)

Prepayments (Tables)	3 Months Ended
	Mar. 31, 2024
Prepayments [Abstract]
Schedule of Prepayments and other assets	Prepayments consist of the following: March 31, December 31, (in thousands) Contract manufacturer and supplier prepayments $ 491,512 $ 502,257 Prepaid maintenance and other services 21,894 17,592 Prepaid taxes 14,335 16,083 Other prepayments 9,901 13,038 Total prepayments (1) $ 537,642 $ 548,970 (1) Exclude s $ 3.2 million and $ 5.3 million at March 31, 2024 and December 31, 2023 , respectively, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Assets held for sale” for additional information.

Product Warranty (Tables)

Product Warranty (Tables)	3 Months Ended
	Mar. 31, 2024
Other Accrued Liabilities	Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities. For the Three Months March 31, April 2, (in thousands) Balance at beginning of period $ 15,698 $ 14,181 Accruals for warranties issued during the period 3,259 4,117 Accruals related to pre-existing warranties ( 683 ) ( 405 ) Settlements made during the period ( 2,950 ) ( 4,992 ) Balance at end of period $ 15,324 $ 12,901
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances	Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances. For the Three Months March 31, April 2, (in thousands) Balance at beginning of period $ 34,897 $ 56,180 Deferral of new extended warranty revenue 6,914 4,413 Recognition of extended warranty deferred revenue ( 7,302 ) ( 11,250 ) Balance at end of period $ 34,509 $ 49,343

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2024
Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions	The fair value was estimated using the Monte Carlo simulation model with the following assumptions: For the Three Months March 31, April 2, Risk-free interest rate 3.9 % 3.9 % Teradyne volatility-historical 42.4 % 50.2 % NYSE Composite Index volatility-historical 15.6 % 24.8 % Dividend yield 0.5 % 0.4 %
Fair Value of Stock Options Using Assumptions	The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions: For the Three Months March 31, April 2, Expected life (years) 4.0 4.0 Risk-free interest rate 4.0 % 3.7 % Volatility-historical 46.3 % 46.7 % Dividend yield 0.5 % 0.4 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2024
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following: Foreign Unrealized Unrealized (Losses) Gains on Cash Flow Hedges Retirement Total (in thousands) Three Months Ended March 31, 2024 Balance at December 31, 2023, net of tax of $ 0 , $( 1,728 ), 142 , $( 1,132 ), respectively $ ( 22,442 ) $ ( 6,194 ) $ 506 $ 1,152 $ ( 26,978 ) Other comprehensive (loss) gain before reclassifications, 0 , $( 221 ), $ 358 , $ 0 , respectively ( 11,457 ) ( 902 ) 1,274 — ( 11,085 ) Amounts reclassified from accumulated other comprehensive 0 , $ 30 , $( 500 ), $ 0 , respectively — 106 ( 1,780 ) ( 2 ) ( 1,676 ) Net current period other comprehensive loss, net of tax 0 , $( 191 ), $( 142 ), $ 0 , respectively ( 11,457 ) ( 796 ) ( 506 ) ( 2 ) ( 12,761 ) Balance at March 31, 2024, net of tax of $ 0 , $( 1,919 ), 0 , $( 1,132 ), respectively $ ( 33,899 ) $ ( 6,990 ) $ — $ 1,150 $ ( 39,739 ) Three Months Ended April 2, 2023 Balance at December 31, 2022, net of tax of $ 0 , $( 2,308 ), 708 ), $( 1,130 ), respectively $ ( 39,849 ) $ ( 8,661 ) $ ( 2,517 ) $ 1,159 $ ( 49,868 ) Other comprehensive gain before reclassifications, 0 , $ 503 , $ 167 , $ 0 , respectively 9,309 2,294 596 — 12,199 Amounts reclassified from accumulated other comprehensive 0 , $ 2 , $ 338 , $ 0 , respectively — 5 1,200 ( 2 ) 1,203 Net current period other comprehensive gain (loss), net of tax 0 , $ 505 , $ 505 , $ 0 , respectively 9,309 2,299 1,796 ( 2 ) 13,402 Balance at April 2, 2023, net of tax of $ 0 , $( 1,803 ), 203 ), $( 1,130 ), respectively $ ( 30,540 ) $ ( 6,362 ) $ ( 721 ) $ 1,157 $ ( 36,466 )
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations	Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended March 31, 2024 and April 2, 2023, were as follows: Details about Accumulated Other Comprehensive Income (Loss) Components For the Three Months Affected Line Item March 31, April 2, (in thousands) Available-for-sale marketable securities: Unrealized losses, net of tax of $( 30 ), $( 2 ), respectively $ ( 106 ) $ ( 5 ) Other (income) expense, net Cash flow hedges: Unrealized (losses) gains, net of tax of $ 500 , $( 338 ), respectively 1,780 ( 1,200 ) Revenue Defined benefit pension and postretirement plans: Amortization of prior service credit, net of tax of $ 0 , $ 0 , 2 2 (a) Total reclassifications, net of tax of $ 470 , $( 340 ), respectively $ 1,676 $ ( 1,203 ) Net income (a) The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note P: “Retirement Plans.”

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2024
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the three months ended March 31, 2024, were as follows: Robotics Wireless Semiconductor System Total (in thousands) Balance at December 31, 2023 Goodwill $ 395,463 $ 361,819 $ 262,237 $ 158,699 $ 1,178,218 Accumulated impairment losses — ( 353,843 ) ( 260,540 ) ( 148,183 ) ( 762,566 ) Total Goodwill 395,463 7,976 1,697 10,516 415,652 Foreign currency translation adjustment ( 7,962 ) — ( 114 ) — ( 8,076 ) Balance at March 31, 2024 Goodwill $ 387,502 $ 361,819 $ 262,123 $ 158,699 1,170,142 Accumulated impairment losses — ( 353,843 ) ( 260,540 ) ( 148,183 ) ( 762,566 ) Total Goodwill $ 387,502 $ 7,976 $ 1,583 $ 10,516 $ 407,576
Schedule of Amortizable Intangible Assets	Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: Gross Accumulated Foreign Net (in thousands) Balance at March 31, 2024 Developed technology $ 267,706 $ ( 246,266 ) $ ( 5,635 ) $ 15,805 Customer relationships 52,109 ( 48,278 ) 203 4,034 Tradenames and trademarks 59,007 ( 47,231 ) ( 1,381 ) 10,395 Total intangible assets $ 378,822 $ ( 341,775 ) $ ( 6,813 ) $ 30,234 Balance at December 31, 2023 Developed technology $ 267,706 $ ( 243,191 ) $ ( 5,343 ) $ 19,172 Customer relationships 52,109 ( 47,850 ) 232 4,491 Tradenames and trademarks 59,007 ( 46,021 ) ( 1,245 ) 11,741 Total intangible assets $ 378,822 $ ( 337,062 ) $ ( 6,356 ) $ 35,404
Schedule of Estimated Intangible Assets Amortization Expense	Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows: Year Amortization (in thousands) 2024 $ 14,010 2025 11,290 2026 2,364 2027 1,148 2028 1,066 Thereafter 356

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2024
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: For the Three Months March 31, April 2, (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 64,197 $ 83,531 Weighted average common shares-basic 153,047 155,904 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 8,862 8,983 Incremental shares from assumed conversion of convertible notes (2) — 914 Restricted stock units 419 453 Stock options 16 48 Employee stock purchase plan 4 6 Dilutive potential common shares 9,301 10,404 Weighted average common shares-diluted 162,348 166,308 Net income per common share-basic $ 0.42 $ 0.54 Net income per common share-diluted $ 0.40 $ 0.50 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant 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 assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2024
Defined Benefit Pension Plans
Net Periodic Pension and Postretirement Benefit Costs	For the three months ended March 31, 2024 and April 2, 2023, Teradyne’s net periodic pension cost was comprised of the following: For the Three Months Ended March 31, 2024 April 2, 2023 United Foreign United Foreign (in thousands) Service cost $ 231 $ 117 $ 272 $ 109 Interest cost 1,647 246 1,711 262 Expected return on plan assets ( 1,268 ) ( 16 ) ( 1,285 ) ( 9 ) Total net periodic pension cost $ 610 $ 347 $ 698 $ 362
Postretirement Benefit Plans
Net Periodic Pension and Postretirement Benefit Costs	For the three months ended March 31, 2024 and April 2, 2023, Teradyne’s net periodic postretirement benefit cost was comprised of the following: For the Three Months March 31, April 2, (in thousands) Service cost $ 10 $ 9 Interest cost 73 61 Amortization of prior service credit ( 2 ) ( 2 ) Special termination benefits 292 — Total net periodic postretirement benefit cost $ 373 $ 68

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2024
Reconciliation of Effective Tax Rate	A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows: For the Three Months March 31, April 2, U.S. statutory federal tax rate 21.0 % 21.0 % Tax credits ( 3.1 ) ( 2.5 ) Discrete benefit related to reserves for uncertain tax positions ( 3.1 ) — International provisions of the U.S. Tax Cuts and Jobs Act of 2017 ( 2.2 ) ( 3.2 ) Foreign taxes ( 2.1 ) ( 0.6 ) Discrete benefit related to equity compensation ( 0.9 ) ( 3.3 ) Other, net 2.3 2.6 Effective tax rate 11.9 % 14.0 %

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Information	Segment information for the three months ended March 31, 2024 and April 2, 2023 is as follows: Semiconductor System Robotics Wireless Segment Total Corporate Consolidated (in thousands) Three Months Ended March 31, 2024 Revenues $ 412,254 $ 75,322 $ 87,654 $ 24,589 $ 599,819 $ — $ 599,819 Income (loss) before income taxes (1)(2) 79,414 18,391 ( 14,047 ) ( 893 ) $ 82,865 ( 9,963 ) $ 72,902 Total assets (3) 1,348,829 181,803 721,318 69,519 $ 2,321,469 1,089,251 $ 3,410,720 Three Months Ended April 2, 2023 Revenues $ 415,009 $ 74,631 $ 89,214 $ 38,675 $ 617,529 $ — $ 617,529 Income (loss) before income taxes (1)(2) 96,185 15,275 ( 18,490 ) 9,352 $ 102,322 ( 5,238 ) $ 97,084 Total assets (3) 1,386,851 173,669 676,092 87,875 $ 2,324,487 1,058,920 $ 3,383,407 (1) Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards. (2) Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, and inventory charges. (3) Total assets are attributable to each segment. Semiconductor Test includ es $ 33.9 million o f total assets classified as assets held for sale. See Note E: "Assets held for sale" for additional information. 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 Three Months March 31, April 2, (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ 4,956 $ 3,768 Restructuring and other—employee severance 983 794 System Test: Cost of revenues—inventory charge $ — $ 675 Robotics: Cost of revenues—inventory charge $ — $ 782 Corporate and Eliminations: Restructuring and other—acquisition & divestiture related expenses 2,214 — Selling and administrative —equity modification 1,469 5,889 Restructuring and other—employee severance $ — $ 659

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Trade Accounts Receivable	$ 23.4	$ 34.2
Deferred Revenue And Customer Advances	28.2	$ 50.7
Revenue, Remaining Performance Obligation, Amount	$ 1,075.2
Short-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	90%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	12 months
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		3 Months Ended
		Mar. 31, 2024	Apr. 02, 2023
Disaggregation of Revenue [Line Items]
Total	[1]	$ 599,819	$ 617,529
System Test
Disaggregation of Revenue [Line Items]
Total	[1]	75,322	74,631
Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	24,589	38,675
Point in Time
Disaggregation of Revenue [Line Items]
Total	[1]	496,198	512,741
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	58,073	56,857
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	20,914	35,363
Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	103,621	104,788
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	17,249	17,774
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	3,675	3,312
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	423,674	424,494
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	25,781	39,590
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	17,141	23,231
Americas
Disaggregation of Revenue [Line Items]
Total	[1]	108,651	118,591
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	36,594	28,980
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	5,824	12,846
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	67,494	74,444
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	12,947	6,061
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,624	2,598
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	302,308	346,834
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	229,592	273,275
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	72,716	73,559
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	270,567	283,259
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	22,551	41,568
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	9,190	22,007
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	109,946	68,175
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	102,436	61,258
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	7,510	6,917
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	95,606	63,695
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	9,052	2,944
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	5,288	1,536
Universal Robots (UR) | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	67,761	72,037
Universal Robots (UR) | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	65,893	70,029
Universal Robots (UR) | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	1,868	2,008
Universal Robots (UR) | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	11,625	13,217
Universal Robots (UR) | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	20,005	20,447
Universal Robots (UR) | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	36,131	38,373
MiR | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	19,893	17,177
MiR | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	19,290	15,959
MiR | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	603	1,218
MiR | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	2,954	1,502
MiR | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	14,625	11,806
MiR | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	$ 2,314	$ 3,869
[1] Include s $ 0.9 million and $ 1.3 million in the three months ended March 31, 2024 and in the three months ended April 2, 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

Disaggregated Revenue by Prim_2

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Accounting Policies [Abstract]
Revenue on leases	$ 0.9	$ 1.3

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Apr. 02, 2023	Dec. 31, 2022
Deferred Revenue Arrangement [Line Items]
Maintenance, service and training	$ 61,404	$ 66,458
Customer advances, undelivered elements and other	39,189	35,731
Extended warranty	34,509	34,897	$ 49,343	$ 56,180
Total deferred revenue and customer advances	$ 135,102	$ 137,086

Assets Held for Sale - Addition

Assets Held for Sale - Additional Information (Detail) $ in Millions	Nov. 07, 2023 USD ($)
Device Interface Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 85

Schedule of Assets Held-for-sal

Schedule of Assets Held-for-sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Prepayments	$ 3,200	$ 5,300
Total current assets held for sale	22,426	23,250
Total assets held for sale	11,458	11,531
Current liabilities:
Total current liabilities held for sale	4,687	7,379
Total liabilities held for sale	1,938	2,000
Device Interface Solutions
Current assets:
Inventories, net	19,276	17,952
Prepayments	3,150	5,298
Total current assets held for sale	22,426	23,250
Property, plant and equipment, net	8,994	8,986
Operating lease right-of-use assets, net	2,464	2,545
Total assets held for sale	33,884	34,781
Current liabilities:
Accounts payable	3,954	6,356
Other accrued liabilities	323	552
Operating lease liabilities	410	471
Total current liabilities held for sale	4,687	7,379
Long-term operating lease liabilities	1,938	2,000
Total liabilities held for sale	6,625	9,379
Net assets held for sale	$ 27,259	$ 25,402

Composition of Inventories, Net

Composition of Inventories, Net (Detail) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Raw material		$ 243,871	$ 258,422
Work-in-process		39,870	26,851
Finished goods		30,491	24,701
Total inventories, net	[1]	$ 314,232	$ 309,974
[1] Inventories, net at March 31, 2024 and December 31, 2023 excludes $ 19.3 million and $ 18.0 million , respectively, of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Assets held for sale" for additional information.

Composition of Inventories, N_2

Composition of Inventories, Net (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventory work in process held for sale	$ 19.3	$ 18

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Inventory reserves	$ 136	$ 136

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) $ in Thousands, € in Millions			3 Months Ended		12 Months Ended
	Apr. 12, 2024 EUR (€)	Nov. 07, 2023 EUR (€)	Mar. 31, 2024 USD ($)	Apr. 02, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain			$ 1,000	$ 300
Available-for-sale securities, realized loss			200	100
Fair market value of investments with unrealized losses greater than one year			41,400		$ 65,200
Fair market value of investments with unrealized losses less than one year			36,200		22,300
Unrealized Gain (loss) on contracts, net			2,700	400
Equity securities unrealized gain			2,600	2,000
Other comprehensive income (Loss), cash flow hedge, gain (loss), before reclassification, after tax			1,274	$ 596
Call Option
Financial Instruments and Fair Value [Line Items]
Unrealized Gain (loss) on contracts, net			13,900
Expiration date of the option		Apr. 26, 2024
Fair value of outstanding contracts			3,400		17,400
Technoprobe S.p.A
Financial Instruments and Fair Value [Line Items]
Percentage of investment acquired		10%
Technoprobe S.p.A | Call Option
Financial Instruments and Fair Value [Line Items]
Notional Amount | €		€ 481
Cash Flow Hedging [Member]
Financial Instruments and Fair Value [Line Items]
Other comprehensive income (Loss), cash flow hedge, gain (loss), before reclassification, after tax					600
Debt Mutual Funds
Financial Instruments and Fair Value [Line Items]
Available for sale securities with out contractual maturity date			10,000
Forward | Subsequent Event
Financial Instruments and Fair Value [Line Items]
Notional Amount | €	€ 481
Expiration date of the option	May 23, 2024
Foreign Exchange Contracts
Financial Instruments and Fair Value [Line Items]
Unrealized Gain (loss) on contracts, net			$ 100		$ 1,800

Schedule of Fair Value of Finan

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 113,976	$ 132,456
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	40,068	41,808
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	35,845	52,734
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	21,706	21,772
Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	10,007	8,773
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	3,863	4,892
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,689	1,667
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	798	810
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	870,608	937,159
Derivative assets	4,251	18,746
Total	874,859	955,905
Derivative liabilities	936	2,545
Total	936	2,545
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	278,229	298,156
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	429,174	459,415
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	40,068	41,808
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	35,845	52,734
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	21,706	21,772
Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	10,007	8,773
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	3,863	4,892
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,689	1,667
Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	798	810
Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	49,229	47,132
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	766,140	807,359
Derivative assets	0	0
Total	766,140	807,359
Derivative liabilities	0	0
Total	0	0
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	278,229	298,156
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	428,675	453,298
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | 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		0
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	10,007	8,773
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	49,229	47,132
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	104,468	129,800
Derivative assets	4,251	18,746
Total	108,719	148,546
Derivative liabilities	936	2,545
Total	936	2,545
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
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	499	6,117
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	40,068	41,808
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	35,845	52,734
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	21,706	21,772
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
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	3,863	4,892
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	1,689	1,667
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	798	810
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total		0
Derivative assets	0	0
Total	0	0
Derivative liabilities	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | 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		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities		$ 0

Schedule of Reported Financial

Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 874,859	$ 955,905
Liabilities	936	2,545
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	936	2,545
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	707,403	757,571
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	41,300	62,154
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	121,905	117,434
Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	4,251	18,746
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	766,140	807,359
Liabilities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
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	706,904	751,454
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
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	59,236	55,905
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	108,719	148,546
Liabilities	936	2,545
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	936	2,545
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	499	6,117
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	41,300	62,154
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	62,669	61,529
Significant Other Observable Inputs (Level 2) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	4,251	18,746
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 0	$ 0

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Available-for-sale marketable securities, Fair Market Value	$ 113,976	$ 132,456
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	707,403	757,571
Available-for-sale marketable securities, Fair Market Value	163,205	179,588
Derivative assets	4,251	18,746
Derivative liabilities	$ 936	$ 2,545
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Deferred Tax and Other Liabilities, Noncurrent	Deferred Tax and Other Liabilities, Noncurrent
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	$ 707,403	$ 757,571
Available-for-sale marketable securities, Fair Market Value	163,205	179,588
Derivative assets	4,251	18,746
Derivative liabilities	$ 936	$ 2,545
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Deferred Tax and Other Liabilities, Noncurrent	Deferred Tax and Other Liabilities, Noncurrent
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent

Schedule of Available for Sale

Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 122,885	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	109	249
Available-for-sale marketable securities, Unrealized (Loss)	(9,018)	(8,170)
Available-for-sale marketable securities, Fair Market Value	113,976	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	77,541	87,538
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	44,519	45,725
Available-for-sale marketable securities, Unrealized Gain	1	14
Available-for-sale marketable securities, Unrealized (Loss)	(4,452)	(3,931)
Available-for-sale marketable securities, Fair Market Value	40,068	41,808
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	38,914	35,080
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	39,946	56,458
Available-for-sale marketable securities, Unrealized Gain	89	201
Available-for-sale marketable securities, Unrealized (Loss)	(4,190)	(3,925)
Available-for-sale marketable securities, Fair Market Value	35,845	52,734
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	31,461	44,263
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,670	1,633
Available-for-sale marketable securities, Unrealized Gain	19	34
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	1,689	1,667
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		0
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	3,883	4,898
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)	(20)	(6)
Available-for-sale marketable securities, Fair Market Value	3,863	4,892
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,863	4,892
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	10,363	9,081
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)	(356)	(308)
Available-for-sale marketable securities, Fair Market Value	10,007	8,773
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,303	3,303
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	21,706	21,772
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	21,706	21,772
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		0
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	798	810
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	798	810
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		$ 0

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 122,885	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	109	249
Available-for-sale marketable securities, Unrealized (Loss)	(9,018)	(8,170)
Available-for-sale marketable securities, Fair Market Value	113,976	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	77,541	87,538
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	41,308	62,385
Available-for-sale marketable securities, Unrealized Gain	19	36
Available-for-sale marketable securities, Unrealized (Loss)	(27)	(267)
Available-for-sale marketable securities, Fair Market Value	41,300	62,154
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	17,657	34,844
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	81,577	77,992
Available-for-sale marketable securities, Unrealized Gain	90	213
Available-for-sale marketable securities, Unrealized (Loss)	(8,991)	(7,903)
Available-for-sale marketable securities, Fair Market Value	72,676	70,302
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 59,884	$ 52,694

Contractual Maturities of Inves

Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 41,308
Due after 1 year through 5 years, cost	26,360
Due after 5 years through 10 years, cost	7,760
Due after 10 years, cost	37,094
Total, cost	112,522
Due within one year, fair market value	41,300
Due after 1 year through 5 years, fair market value	25,819
Due after 5 years through 10 years, fair market value	7,405
Due after 10 years, fair maket value	29,445
Total, fair market value	$ 103,969

Schedule of Notional Amount of

Schedule of Notional Amount of Derivatives (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	$ 168.1
Derivative Asset, Notional amounts		$ 152.1
U.S. dollar/Japanese yen
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	57.5	11
U.S. dollar/Taiwan dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	20.1	42.7
U.S. dollar/Korean won
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	6.6	7.2
U.S. dollar/British pound sterling
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	1	1.5
Euro/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	25.8	25.3
Singapore dollar/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	17.6	16.6
Philippine peso/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	9.9	10.1
Chinese yuan/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	0.6	1
Danish krone/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	28.4	36
Derivative Asset, Notional amounts	$ 0.6	$ 0.7

Schedule Of Foreign Currency Ca

Schedule Of Foreign Currency Cash Flow Hedges (Detail) - Foreign Exchange Forward [Member] - Cash Flow Hedging [Member] - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative, Notional Amount	$ 0	$ 35.5
Long [Member] | U.S. dollar/Japanese yen
Derivative, Notional Amount	$ 0	$ 35.5

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ 3,315	$ 16,200
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	805	733
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(936)	(2,545)
Not Designated as Hedging Instrument | Foreign Exchange Option [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	3,446	17,364
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 0	$ 648

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Apr. 02, 2023
Foreign Exchange Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		$ 9,939	$ 2,797
Other (income) expense, net | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Losses (Gains) on derivatives recognized in statements of operations	[1]	(1,699)	1,259
Other (income) expense, net | Not Designated as Hedging Instrument [Member] | Foreign Exchange Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		13,918	0
Sales [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward and Option Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		$ (2,280)	$ 1,538
[1] The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three months ended March 31, 2024 and April 2, 2023, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 2.7 million and $ 0.4 million, respectively.

Schedule of Effect of Derivat_2

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized Gain (loss) on contracts	$ 2.7	$ 0.4

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Dec. 12, 2016	Mar. 31, 2024	Apr. 02, 2023	Dec. 31, 2023	Oct. 05, 2022	May 01, 2020
Debt Instrument
Repurchase of common stock		$ 22,117	$ 93,308
Line of Credit Facility, Maximum Borrowing Capacity					$ 750,000	$ 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 SOFR plus a margin ranging from 1.10% to 1.85% 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
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA		15%
Retained Earnings (Accumulated Deficit)		$ 730,260		$ 706,514
Warrant [Member]
Debt Instrument
Warrant expired		0.8
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
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
Repurchase of common stock	$ 50,100
Repurchase of stock, shares	2
Debt instrument, frequency of periodic payment	payable semiannually in arrears on June 15 and December 15 of each year
1.25% Convertible Senior Unsecured Notes
Debt Instrument
Senior notes maturity date	Dec. 15, 2023
Shares that would be issued upon conversion		13.8
Strike price per share of warrant		$ 39.37
Maximum | 1.25% Convertible Senior Unsecured Notes
Debt Instrument
Warrant transactions expiry date		Jul. 10, 2024
Minimum | 1.25% Convertible Senior Unsecured Notes
Debt Instrument
Warrant transactions expiry date		Mar. 18, 2024
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%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate		1.85%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Truist Bank [Member]
Debt Instrument
Debt instrument, basis spread on variable rate		1.10%

Interest Expense on Teradyne's

Interest Expense on Teradyne's Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Debt Instrument
Contractual interest expense on the coupon	$ 0	$ 138
Amortization of debt issuance fees recognized as interest expense	0	113
Total interest expense on the convertible debt	$ 0	$ 251

Schedule of Prepayments and Oth

Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments		$ 491,512	$ 502,257
Prepaid maintenance and other services		21,894	17,592
Prepaid taxes		14,335	16,083
Other prepayments		9,901	13,038
Total prepayments	[1]	$ 537,642	$ 548,970
[1] Exclude s $ 3.2 million and $ 5.3 million at March 31, 2024 and December 31, 2023 , respectively, of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: “Assets held for sale” for additional information.

Prepayments - Schedule of Prepa

Prepayments - Schedule of Prepayments and Other Current Assets (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Prepayments [Abstract]
Contract manufacturer and supplier prepayments, classified as assets held for sale	$ 3.2	$ 5.3

Warranty Accrual Included in Ot

Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 15,698	$ 14,181
Accruals for warranties issued during the period	3,259	4,117
Accruals related to pre-existing warranties	(683)	(405)
Settlements made during the period	(2,950)	(4,992)
Balance at end of period	$ 15,324	$ 12,901

Extended Product Warranty of Sh

Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 34,897	$ 56,180
Deferral of new extended warranty revenue	6,914	4,413
Recognition of extended warranty deferred revenue	(7,302)	(11,250)
Balance at end of period	$ 34,509	$ 49,343

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Apr. 02, 2023	Oct. 02, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Stock price	$ 95.14	$ 103.44
Description of retirement policy	On January 22, 2024, the Board enacted the Executive Retirement Policy for Restricted Stock Unit and Option Vesting (the "Retirement Policy"). Under the Retirement Policy, an executive officer that is over the age of 65 and has 10 or more years of service as of the effective date of his or her retirement will be eligible for continued vesting of his or her unvested time-based restricted stock units and stock options granted prior to his or her retirement date.
Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense		$ 5.9
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of common stock price paid	100%
Employee Stock Option [Member] | 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
Employee Stock Option [Member] | Measurement Input, Expected Dividend Payment [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Estimated annual dividend amount per share	$ 0.48	$ 0.44
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
Percentage of awards vesting on the first anniversary of grant date	100%
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
TSR Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Minimum years of service for retirement to be eligible for PRSUs	10 years
Restricted stock unit awards granted	0.1	0.1
Weighted average grant date fair value of restricted stock units granted	$ 100.87	$ 137.64
Stock price	95.14	$ 103.44
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	$ 0.48		$ 0.44
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	0%
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	200%
Employee Stock Purchase Plan | 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
PBIT Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1	0.1
Weighted average grant date fair value of restricted stock units granted	$ 94.01	$ 102.23
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.5	0.5
Weighted average grant date fair value of restricted stock units granted	$ 94.28	$ 102.36
Service-Based Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1	0.1
Service Based Stock Options | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of restricted stock units granted	$ 37.5	$ 40.9

Schedule of Estimated Fair Valu

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions (Detail) - TSR Performance-Based Restricted Stock Units	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	3.90%	3.90%
Expected historical volatility	42.40%	50.20%
Dividend yield	0.50%	0.40%
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	15.60%	24.80%

Schedule of Estimated Fair Va_2

Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Employee Stock Option [Member]	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	4 years	4 years
Risk-free interest rate	4%	3.70%
Volatility-historical	46.30%	46.70%
Dividend yield	0.50%	0.40%

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,525,897	$ 2,451,294
Other comprehensive income (loss)	(12,761)	13,402
Balance	2,557,829	2,449,462
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(22,442)	(39,849)
Other comprehensive (loss) gain before reclassifications, net of tax	(11,457)	9,309
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive income (loss)	(11,457)	9,309
Balance	(33,899)	(30,540)
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(6,194)	(8,661)
Other comprehensive (loss) gain before reclassifications, net of tax	(902)	2,294
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	106	5
Other comprehensive income (loss)	(796)	2,299
Balance	(6,990)	(6,362)
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	506	(2,517)
Other comprehensive (loss) gain before reclassifications, net of tax	1,274	596
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1,780)	1,200
Other comprehensive income (loss)	(506)	1,796
Balance	0	(721)
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,152	1,159
Other comprehensive (loss) gain before reclassifications, net of tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(2)	(2)
Other comprehensive income (loss)	(2)	(2)
Balance	1,150	1,157
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(26,978)	(49,868)
Other comprehensive (loss) gain before reclassifications, net of tax	(11,085)	12,199
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1,676)	1,203
Other comprehensive income (loss)	(12,761)	13,402
Balance	$ (39,739)	$ (36,466)

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (470)	$ 340
Foreign currency translation adjustments, tax	0	0	$ 0	$ 0
Unrealized (losses) gains on marketable securities, tax	(1,919)	(1,803)	(1,728)	(2,308)
Unrealized (Losses) Gains on Cash Flow Hedges	0	(203)	142	(708)
Retirement plans prior service benefit, tax	(1,132)	(1,130)	$ (1,132)	$ (1,130)
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	(221)	503
Amounts reclassified from accumulated other comprehensive income (loss), tax	30	2
Other comprehensive income (loss), tax	(191)	505
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	358	167
Amounts reclassified from accumulated other comprehensive income (loss), tax	(500)	338
Other comprehensive income (loss), tax	(142)	505
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	0	0
Other comprehensive income (loss), tax	$ 0	$ 0

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	$ (106)	$ (5)
Unrealized (losses) gains, net	1,780	(1,200)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	(106)	(5)
Reclassifications, net of tax	(106)	(5)
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	2	2
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	$ 1,676	$ (1,203)

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 500	$ (338)
Reclassifications, tax	470	(340)
Unrealized (Losses) Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	(30)	(2)
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 0	$ 0

Goodwill and Acquired Intangi_3

Goodwill and Acquired Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired intangible assets amortization	$ 4,697	$ 4,802

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024
Goodwill [Line Items]
Goodwill	$ 1,178,218	$ 1,170,142
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	(8,076)
Total Goodwill	415,652	407,576
Robotics
Goodwill [Line Items]
Goodwill	395,463	387,502
Accumulated impairment losses	0	0
Foreign currency translation adjustment	(7,962)
Total Goodwill	395,463	387,502
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)
Foreign currency translation adjustment	0
Total Goodwill	7,976	7,976
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,237	262,123
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	(114)
Total Goodwill	1,697	1,583
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)
Foreign currency translation adjustment	0
Total Goodwill	$ 10,516	$ 10,516

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 378,822	$ 378,822
Accumulated Amortization	(341,775)	(337,062)
Foreign Currency Translation Adjustment	(6,813)	(6,356)
Net Carrying Amount	30,234	35,404
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	267,706	267,706
Accumulated Amortization	(246,266)	(243,191)
Foreign Currency Translation Adjustment	(5,635)	(5,343)
Net Carrying Amount	15,805	19,172
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	52,109	52,109
Accumulated Amortization	(48,278)	(47,850)
Foreign Currency Translation Adjustment	203	232
Net Carrying Amount	4,034	4,491
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	59,007	59,007
Accumulated Amortization	(47,231)	(46,021)
Foreign Currency Translation Adjustment	(1,381)	(1,245)
Net Carrying Amount	$ 10,395	$ 11,741

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Finite-Lived Intangible Assets
2024	$ 14,010
2025	11,290
2026	2,364
2027	1,148
2028	1,066
Thereafter	$ 356

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Employee Stock Option [Member]
Net Income Loss Per Common Share
Exercise of stock options	0.4	0.5

Computation of Basic and Dilute

Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2024	Apr. 02, 2023
Net Income Loss Per Common Share
Net Income (Loss)		$ 64,197	$ 83,531
Weighted average common shares-basic		153,047	155,904
Convertible note hedge warrant shares	[1]	8,862	8,983
Incremental shares from assumed conversion of convertible notes	[2]	0	914
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements		4	6
Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total		9,301	10,404
Weighted average common shares-diluted		162,348	166,308
Earnings Per Share, Basic		$ 0.42	$ 0.54
Earnings Per Share, Diluted		$ 0.4	$ 0.5
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		419	453
Employee Stock Option [Member]
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		16	48
[1] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant 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. Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Restructuring Cost and Reserve
Severance benefit and charges	$ 2	$ 2
Technoprobe [Member]
Restructuring Cost and Reserve
Acquisition and divestiture expenses	$ 2.2

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	$ 0.8	$ 0.8
Non-United States Subsidiaries
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans in 2018	$ 0.3	$ 0.2

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Defined Benefit Plan Disclosure
Service cost	$ 231	$ 272
Interest cost	1,647	1,711
Expected return on plan assets	(1,268)	(1,285)
Total net periodic pension cost	610	698
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	117	109
Interest cost	246	262
Expected return on plan assets	(16)	(9)
Total net periodic pension cost	347	362
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	10	9
Interest cost	73	61
Amortization of prior service credit	(2)	(2)
Special termination benefits	292	0
Total net periodic pension cost	$ 373	$ 68

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments	$ 428,800
Purchase commitments less than one year	404,700
Product warranty accrual	15,300,000	$ 15,700,000
Revenue deferrals related to extended warranties	$ 34,500,000	$ 34,900,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
	Apr. 02, 2023	Dec. 15, 2022	Aug. 16, 2022	Mar. 31, 2024	Apr. 02, 2023	Dec. 31, 2023
Income Taxes [Line Items]
Decrease in Unrecognised Tax Benefit due to lapse in Statute of limitation				$ 0.8
Accrued interest and penalties				0.7		$ 1.3
Interest and penalties related to income tax, expense (benefit)	$ 0.1			(0.6)
Uncertain tax positions				15.9		$ 18.6
Net increase in uncertain tax positions				$ (2.7)
Percentage of alternative minimum tax			15%
Minimum effective tax rate		15%
SINGAPORE
Income Taxes [Line Items]
Tax savings due to the tax holiday, per share				$ 0.01	$ 0
Income Tax Holiday, Aggregate Dollar Amount				$ 1.1	$ 0.2

Schedule of Reconciliation of E

Schedule of Reconciliation of Effective Tax Rate (Detail)	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	21%	21%
Tax credits	(3.10%)	(2.50%)
Discrete benefit related to reserves for uncertain tax positions	(3.10%)	0%
International provisions of the U.S. Tax Cuts and Jobs Act of 2017	(2.20%)	(3.20%)
Foreign taxes	(2.10%)	(0.60%)
Discrete benefit related to equity compensation	(0.90%)	(3.30%)
Other, net	2.30%	2.60%
Effective tax rate	11.90%	14%

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 Segment
Segment Reporting Information [Line Items]
Operating segments	4

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Apr. 02, 2023		Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenues	[1]	$ 599,819		$ 617,529
Income (loss) before income taxes	[2],[3]	72,902		97,084
Total assets		3,410,720	[4]	3,383,407	[4]	$ 3,486,824
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	75,322		74,631
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	24,589		38,675
Operating Segments
Segment Reporting Information [Line Items]
Revenues		599,819		617,529
Income (loss) before income taxes	[2],[3]	82,865		102,322
Total assets	[4]	2,321,469		2,324,487
Operating Segments | Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		412,254		415,009
Income (loss) before income taxes	[2],[3]	79,414		96,185
Total assets	[4]	1,348,829		1,386,851
Operating Segments | System Test
Segment Reporting Information [Line Items]
Revenues		75,322		74,631
Income (loss) before income taxes	[2],[3]	18,391		15,275
Total assets	[4]	181,803		173,669
Operating Segments | Robotics
Segment Reporting Information [Line Items]
Revenues		87,654		89,214
Income (loss) before income taxes	[2],[3]	(14,047)		(18,490)
Total assets	[4]	721,318		676,092
Operating Segments | Wireless Test
Segment Reporting Information [Line Items]
Revenues		24,589		38,675
Income (loss) before income taxes	[2],[3]	(893)		9,352
Total assets	[4]	69,519		87,875
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		0		0
Income (loss) before income taxes	[2],[3]	(9,963)		(5,238)
Total assets	[4]	$ 1,089,251		$ 1,058,920
[1] Include s $ 0.9 million and $ 1.3 million in the three months ended March 31, 2024 and in the three months ended April 2, 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.” Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards. Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, and inventory charges. Total assets are attributable to each segment. Semiconductor Test includ es $ 33.9 million o f total assets classified as assets held for sale. See Note E: "Assets held for sale" for additional information. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

Schedule of Segment Informati_2

Schedule of Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Apr. 02, 2023
Segment Reporting Information [Line Items]
Assets held for sale	$ 11,458	$ 11,531
Semiconductor Test | Operating Segments
Segment Reporting Information [Line Items]
Assets held for sale	$ 33,900		$ 33,900

Schedule of Segment Reporting I

Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 4,427	$ 2,037
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	4,956	3,768
Restructuring and other—employee severance	983	794
System Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	675
Robotics
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	782
Corporate And Eliminations
Segment Reporting Information [Line Items]
Restructuring and other-acquisition & divestiture related expenses	2,214	0
Selling and administrative-equity modification	1,469	5,889
Restructuring and other—employee severance	$ 0	$ 659

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Jan. 01, 2023	Mar. 31, 2024	Apr. 02, 2023	Jan. 31, 2024	Jan. 31, 2023
Common stock average price		$ 100.31	$ 104.88
Dividends Payable, Amount Per Share				$ 0.12	$ 0.11
Dividend payment		$ 18,370	$ 17,165
Percentage of excise tax on share repurchases in excess of issuances	1%
Cumulative repurchases, shares		0.2	0.9
Cumulative repurchases, value	$ 90,000	$ 22,100	$ 93,700		$ 2,000,000
2023 Repurchase Program [Member]
Common stock average price		$ 102.35
Cumulative repurchases, shares		4.1
Cumulative repurchases, value		$ 422,600