Teradyne (TER) 10-K 20 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Feb. 14, 2025	Jun. 30, 2024
Cover [Abstract]
Amendment Flag	false
Document Type	10-K
Document Fiscal Year Focus	2024
Entity Central Index Key	0000097210
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Document Period End Date	Dec. 31, 2024
Entity Registrant Name	TERADYNE, INC.
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 24
Trading Symbol	TER
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity File Number	001-06462
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2272148
Entity Address, Address Line One	600 RIVERPARK DRIVE
Entity Address, City or Town	NORTH READING
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01864
City Area Code	978
Local Phone Number	370-2700
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		161,718,766
ICFR Auditor Attestation Flag	true
Auditor Name	PricewaterhouseCoopers LLP
Auditor Firm ID	238
Auditor Location	Boston, Massachusetts
Document Financial Statement Error Correction [Flag]	false
Documents Incorporated by Reference [Text Block]	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s proxy statement in connection with its 2024 annual meeting of shareholders are incorporated by reference into Part III of this Form 10-K.
Auditor Opinion [Text Block]	Opinions on the Financial Statements and Internal Control over Financial Reporting We have audited the accompanying consolidated balance sheets of Teradyne, Inc. and its subsidiaries (the "Company") as of December 31, 2024 and 2023, and the related consolidated statements of operations, of comprehensive income, of convertible common shares and shareholders' equity and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes and schedule of valuation and qualifying accounts for each of the three years in the period ended December 31, 2024 appearing under Item 15(c) (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 553,354	$ 757,571
Marketable securities		46,312	62,154
Accounts receivable, less allowance for credit losses of $2,111 and $1,988 in 2024 and 2023, respectively		471,426	422,124
Inventories, net		298,492	309,974	[1]
Prepayments		429,086	548,970	[2]
Other current assets		17,727	37,992
Current assets held for sale		0	23,250
Total current assets		1,816,397	2,162,035
Property, plant and equipment, net		508,171	445,492	[3]
Operating lease right-of-use assets, net		70,185	73,417
Marketable securities		124,121	117,434
Deferred tax assets		222,438	175,775
Retirement plans assets		11,994	11,504
Equity Method Investment		494,494	0
Other assets		49,620	38,580
Acquired intangible assets, net		15,927	35,404
Goodwill		395,367	415,652
Long-term assets held for sale		0	11,531
Total assets	[4]	3,708,714	3,486,824
Current liabilities:
Accounts payable		134,792	180,131
Accrued employees' compensation and withholdings		204,991	191,750
Deferred revenue and customer advances		107,710	99,804
Other accrued liabilities		90,777	114,712
Operating lease liabilities		18,699	17,522
Income taxes payable		67,610	48,653
Current liabilities held for sale		0	7,379
Total current liabilities		624,579	659,951
Retirement plans liabilities		133,338	132,090
Long-term deferred revenue and customer advances		40,505	37,282
Deferred tax liabilities		1,038	183
Long-term other accrued liabilities		7,442	19,998
Long-term operating lease liabilities		57,922	65,092
Long-term incomes taxes payable		24,596	44,331
Long-term liabilities held for sale		0	2,000
Total liabilities		889,420	960,927
Commitments and contingencies (Note N)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 161,722 and 152,698 shares issued and outstanding at December 31, 2024 and 2023, respectively		20,215	19,087
Additional paid-in capital		1,909,538	1,827,274
Accumulated other comprehensive loss		(81,220)	(26,978)
Retained earnings		970,761	706,514
Total shareholders' equity		2,819,294	2,525,897
Total liabilities and shareholders' equity		$ 3,708,714	$ 3,486,824
[1] Excludes $ 18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information. Excludes $ 5.3 million of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: "Dispositions" for additional information. Excludes $ 9.0 million of property, plant and equipment, net classified as assets held for sale. See Note E: "Dispositions" for additional information. Total assets are attributable to each segment. In 2023, Semiconductor Test includes $ 34.8 million of total assets classified as assets held for sale. See Note E: "Dispositions" for additional information. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts	$ 2,111	$ 1,988
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	161,722	152,698
Common stock, shares outstanding	161,722	152,698

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenues	[1],[2]	$ 2,819,880	$ 2,676,298	$ 3,155,045
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		1,170,953	1,139,550	1,287,894
Gross profit		1,648,927	1,536,748	1,867,151
Operating expenses:
Selling and administrative		617,047	577,315	558,103
Engineering and development		460,876	418,089	440,591
Acquired intangible assets amortization		18,764	18,999	19,333
Restructuring and other		15,571	21,277	17,185
Gain on sale of business		(57,119)	0	0
Total operating expenses		1,055,139	1,035,680	1,035,212
Income from operations		593,788	501,068	831,939
Non-operating (income) expenses:
Interest income		(24,772)	(27,348)	(6,379)
Interest expense		3,587	3,806	3,719
Other (income) expense, net		5,887	(962)	(5,786)
Income before income taxes and equity in net earnings of affiliate		609,086	525,572	840,385
Income tax provision		59,503	76,820	124,884
Income before equity in net earnings of affiliate		549,583	448,752	715,501
Equity in net earnings of affiliate		(7,211)	0	0
Net income		$ 542,372	$ 448,752	$ 715,501
Net income per common share:
Basic		$ 3.41	$ 2.91	$ 4.52
Diluted		$ 3.32	$ 2.73	$ 4.22
Weighted average common shares—basic		159,083	154,310	158,434
Weighted average common shares—diluted		163,314	164,304	169,734
Product [Member]
Revenues:
Total revenues		$ 2,294,935	$ 2,096,286	$ 2,591,572
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		960,888	882,892	1,042,555
Service [Member]
Revenues:
Total revenues		524,945	580,012	563,473
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 210,065	$ 256,658	$ 245,339
[1] Includes $ 3.7 m illion, $ 5.2 million and $ 8.2 million in 2024, 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.” Revenues attributable to a country are based on location of customer site.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 542,372	$ 448,752	$ 715,501
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0, $0, $0, respectively	(52,847)	17,407	(29,031)
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(470), $568, ($3,388), respectively	(1,699)	2,423	(12,666)
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $24, $12, $25, respectively	86	44	301
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(1,613)	2,467	(12,365)
Cash flow hedges:
Unrealized (losses) gains arising during period, net of tax of $593, $1,537, $(708), respectively	2,100	5,464	(2,517)
Less: Reclassification adjustment for (gains) losses included in net income, net of tax of $(527), $(686), $0, respectively	(1,875)	(2,441)	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	225	3,023	(2,517)
Defined benefit post-retirement plan:
Amortization of prior service credit, net of tax $(2), $(2), $(2), respectively	(7)	(7)	(7)
Other comprehensive income (loss)	(54,242)	22,890	(43,920)
Comprehensive income	$ 488,130	$ 471,642	$ 671,581

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0
Unrealized gains (losses) on marketable securities arising during period, net of tax	(470)	568	(3,388)
Reclassification adjustment for losses (gains) included in net income, net of tax	24	12	25
Amortization of prior service credit, net of tax	(2)	(2)	(2)
Cash flow hedges Unrealized gains (losses)	593	1,537	(708)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ (527)	$ (686)	$ 0

CONSOLIDATED STATEMENTS OF CONV

CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Common Stock Convertible Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (loss)	Retained Earnings
Balance at Dec. 31, 2021	$ 2,562,444	$ 20,281		$ 1,811,545	$ (5,948)	$ 736,566
Balance, Shares at Dec. 31, 2021		162,251,000	1,512,000
Net issuance of common stock under stock-based plans	(4,375)	$ 96		(4,471)
Net issuance of common stock under stock-based plans (in shares)		761,000
Stock-based compensation expense	48,466			48,466
Repurchase of common stock	(752,082)	$ (907)				(751,175)
Repurchase of common stock (in shares)		(7,253,000)
Cash dividends	(69,763)					(69,763)
Settlements of convertible notes	(255)	$ 187		(442)
Settlement of convertible notes (in shares)		1,495,000
Exercise of convertible notes hedge call options	0	$ (187)		187
Exercise of convertible notes hedge call options (in shares)		(1,495,000)
Convertible common shares	1,512			1,512
Convertible common shares (in shares)			(1,512,000)
Cumulative-effect of change in accounting principle related to convertible debt	(6,234)			(100,834)		94,600
Net income	715,501					715,501
Other comprehensive income (loss)	(43,920)				(43,920)
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	0
Net issuance of common stock under stock-based plans	13,477	$ 106		13,371
Net issuance of common stock under stock-based plans (in shares)		848,000
Stock-based compensation expense	57,940			57,940
Repurchase of common stock	(400,529)	$ (489)				(400,040)
Repurchase of common stock (in shares)		(3,909,000)
Cash dividends	(67,927)					(67,927)
Settlements of convertible notes	0	$ 133		(133)
Settlement of convertible notes (in shares)		1,072,000
Exercise of convertible notes hedge call options	0	$ (133)		133
Exercise of convertible notes hedge call options (in shares)		(1,072,000)
Net income	448,752					448,752
Other comprehensive income (loss)	22,890				22,890
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	0
Net issuance of common stock under stock-based plans	23,228	$ 91		23,137
Net issuance of common stock under stock-based plans (in shares)		728,000
Stock-based compensation expense	60,397			60,397
Warrant exercises	(16)	$ 1,254		(1,270)
Warrant exercises (in shares)		10,036,000
Repurchase of common stock	(201,883)	$ (217)				(201,666)
Repurchase of common stock (in shares)		(1,740,000)
Cash dividends	(76,459)					(76,459)
Net income	542,372					542,372
Other comprehensive income (loss)	(54,242)				(54,242)
Balance at Dec. 31, 2024	$ 2,819,294	$ 20,215		$ 1,909,538	$ (81,220)	$ 970,761
Balance, Shares at Dec. 31, 2024		161,722,000	0

CONSOLIDATED STATEMENTS OF CO_3

CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.48	$ 0.44	$ 0.44

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 542,372	$ 448,752	$ 715,501
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	100,977	92,118	90,763
Stock-based compensation	60,122	57,682	48,228
Provision for excess and obsolete inventory	18,922	28,358	31,452
Amortization	18,764	18,768	19,912
Losses (gains) on investments	10,056	(14,915)	9,985
Equity in net earnings of affiliate	7,211	0	0
Gain on sale of business	(57,119)	0	0
Deferred taxes	(46,360)	(37,642)	(38,693)
Retirement plans actuarial (gains) losses	(4,355)	2,703	(25,584)
Loss (gain) on sale of asset	0	0	(3,410)
Other	(2,290)	(955)	2,353
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	(52,659)	70,977	50,628
Inventories	8,707	5,327	(80,809)
Prepayments and other assets	119,454	(43,101)	(140,713)
Accounts payable and other accrued expenses	(54,386)	46,782	(60,507)
Deferred revenue and customer advances	12,176	(57,210)	(6,233)
Retirement plan contributions	(5,814)	(5,492)	(5,116)
Income taxes	(3,602)	(26,921)	(29,834)
Net cash provided by operating activities	672,176	585,231	577,923
Cash flows from investing activities:
Investments in businesses	(532,060)	0	0
Purchases of property, plant and equipment	(198,095)	(159,642)	(163,249)
Purchases of marketable securities	(45,796)	(161,906)	(287,409)
Issuance of convertible loan	0	(5,000)	0
Proceeds from the sale of a business, net of cash and cash equivalents sold	90,348	0	0
Proceeds from maturities of marketable securities	38,353	85,042	222,941
Proceeds from sales of marketable securities	24,035	61,401	268,058
Proceeds from life insurance	873	460	0
Proceeds from sale of asset	0	0	3,410
Net cash (used for) provided by investing activities	(622,342)	(179,645)	43,751
Cash flows from financing activities:
Repurchase of common stock	(198,574)	(397,241)	(752,082)
Payments of borrowings on revolving credit facility	(185,000)	0	0
Dividend payments	(76,423)	(67,878)	(69,711)
Payments related to net settlement of employee stock compensation awards	(14,100)	(20,788)	(33,170)
Payments of convertible debt principal	0	(50,264)	(66,759)
Proceeds from borrowings on revolving credit facility	185,000	0	0
Issuance of common stock under stock purchase and stock option plans	37,330	34,259	28,733
Net cash used for financing activities	(251,767)	(501,912)	(892,989)
Effects of exchange rate changes on cash and cash equivalents	(2,284)	(876)	3,889
(Decrease) Increase in cash and cash equivalents	(204,217)	(97,202)	(267,426)
Cash and cash equivalents at beginning of year	757,571	854,773	1,122,199
Cash and cash equivalents at end of year	553,354	757,571	854,773
Cash paid for:
Interest	767	296	1,498
Income taxes	121,428	140,239	193,246
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 3,893	$ 2,735	$ 1,826

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 542,372	$ 448,752	$ 715,501

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b51 Arr Modified Flag	false
Non-Rule 10b5-1 Arrangement Modified	false

Cybersecurity Risk Management,

Cybersecurity Risk Management, Strategy, and Governance Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Item 1C: Cybersecurity We believe cybersecurity is critical to supporting our vision and enabling our strategy. As a producer of leading-edge electronic testing products and maker of advanced robotics, we face a multitude of cybersecurity threats that range from attacks common to most industries, such as ransomware and denial-of-service, to attacks from more advanced, persistent, and highly organized adversaries, including nation state actors, that may target us for our role in critical infrastructure sectors. Our customers, suppliers, and partners face similar cybersecurity threats and, while we have not been materially affected to date, a cybersecurity incident impacting us or any of these entities could materially adversely affect our operations, performance, and results of operations. These cybersecurity threats and related risks make it imperative that we maintain a strong focus on cybersecurity. Governance The Board of Directors oversees management’s processes for identifying and mitigating risks, including cybersecurity risks, to help align our risk exposure with our strategic objectives. Senior leadership, including our Chief Information Security Officer ("CISO"), brief the Audit Committee of the Board of Directors quarterly and the full Board of Directors at least annually on our cybersecurity and information security posture. The corporate information security organization, under the CISO, has implemented a governance structure and processes to assess, identify, manage, and report cybersecurity risks. The CISO chairs management’s Cybersecurity Steering Committee, in which current cyber threats, program performance, and ongoing risk mitigations are regularly reviewed . Cybersecurity related risks are also integrated into our overall enterprise risk management ("ERM") process. These risks are included in the risk universe that the ERM function evaluates to assess top enterprise risks on an annual basis and is reviewed and evaluated by the Board of Directors. The Board of Directors is also apprised of cybersecurity issues or incidents deemed to have a moderate or higher business impact as they arise, even if considered immaterial. In the event of a significant incident, we intend to follow our detailed incident response playbooks, which outline the steps to be followed from incident detection through mitigation, recovery and notification, including escalation to functional areas (e.g., legal), and escalation to senior leadership via the Cybersecurity Steering Committee. Upon escalation, the Cybersecurity Steering Committee will review all inputs, assess the materiality of the incident, and then brief the Board of Directors on the determination and on how management intends to respond. Risk management and strategy Our global information security organization, led by our CISO, is responsible for our overall information security strategy , policy, security engineering, operations, and cyber threat detection and response . Our CISO is an experienced cybersecurity senior executive with more than 25 years of experience building and leading cybersecurity, risk management and information technology teams. The information security organization manages and continually enhances a robust enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing system resilience and deploying highly proficient detection and response capabilities in an effort to minimize the business impact should an incident occur. Central to this organization is our global cyber operations team, which is responsible for the protection, detection, and response capabilities used in the defense of critical data and enterprise computing services. We also have a corporate-wide insider threat detection program to proactively identify external and internal threats and mitigate those threats in a timely manner. Our broader Teradyne employee community also has a key role in our cybersecurity defenses and is immersed in a comprehensive training and awareness curriculum to build and promote a corporate culture supportive of security. Third parties also play a role in our cybersecurity. We engage third-party services to provide 24x7x365 monitoring, escalation, and response to cyber events. In addition to consulting on best practices, we leverage third parties for independent evaluations of our security controls through penetration testing and independent audits. These evaluations include testing both the design and operational effectiveness of security controls. We also share and receive threat intelligence with our industry peers, cybersecurity associations, and our cyber controls vendors. We rely on contract manufacturing organizations and distributors to deliver our products to our customers, and a cybersecurity incident at one of these organizations or a key supplier could materially adversely impact us. We assess third party and supply chain cybersecurity controls through risk monitoring services tailored to align with our risk policy. Notwithstanding the extensive approach we take to cybersecurity, we may not be successful in preventing or mitigating a cybersecurity incident that could have a material adverse effect on us, either directly within our managed environment or indirectly via a third-party partner or supply chain vendor. Periodically we have a recognized independent security expert firm to assess our cyber security maturity along with risks and provide feedback on where we should continue to improve to mitigate exposures. We share this review with our Board and develop a security roadmap which incorporates this feedback. Additionally, for our business that supports the defense and aerospace sector, we must comply with extensive regulations, including requirements imposed by the Defense Federal Acquisition Regulation Supplement ("DFARS") related to adequately safeguarding controlled unclassified information ("CUI") and reporting cybersecurity incidents to the DoD . We have implemented cybersecurity policies and frameworks based on industry and governmental standards to align closely with DoD requirements, instructions, and guidance. Moreover, we are pursuing the necessary controls to support the Cybersecurity Maturity Model Certification ("CMMC") program, DoD’s program to ensure members of the defense industrial base meet cybersecurity requirements for handling CUI and federal contract information. We believe we are well positioned to meet the requirements of the CMMC and are preparing for certification once the requirements are effective.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	. Cybersecurity related risks are also integrated into our overall enterprise risk management ("ERM") process. These risks are included in the risk universe that the ERM function evaluates to assess top enterprise risks on an annual basis and is reviewed and evaluated by the Board of Directors. The Board of Directors is also apprised of cybersecurity issues or incidents deemed to have a moderate or higher business impact as they arise, even if considered immaterial.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Board of Directors oversees management’s processes for identifying and mitigating risks, including cybersecurity risks, to help align our risk exposure with our strategic objectives. Senior leadership, including our Chief Information Security Officer ("CISO"), brief the Audit Committee of the Board of Directors quarterly and the full Board of Directors at least annually on our cybersecurity and information security posture. The corporate information security organization, under the CISO, has implemented a governance structure and processes to assess, identify, manage, and report cybersecurity risks. The CISO chairs management’s Cybersecurity Steering Committee, in which current cyber threats, program performance, and ongoing risk mitigations are regularly reviewed . Cybersecurity related risks are also integrated into our overall enterprise risk management ("ERM") process. These risks are included in the risk universe that the ERM function evaluates to assess top enterprise risks on an annual basis and is reviewed and evaluated by the Board of Directors. The Board of Directors is also apprised of cybersecurity issues or incidents deemed to have a moderate or higher business impact as they arise, even if considered immaterial. In the event of a significant incident, we intend to follow our detailed incident response playbooks, which outline the steps to be followed from incident detection through mitigation, recovery and notification, including escalation to functional areas (e.g., legal), and escalation to senior leadership via the Cybersecurity Steering Committee. Upon escalation, the Cybersecurity Steering Committee will review all inputs, assess the materiality of the incident, and then brief the Board of Directors on the determination and on how management intends to respond.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The corporate information security organization, under the CISO, has implemented a governance structure and processes to assess, identify, manage, and report cybersecurity risks. The CISO chairs management’s Cybersecurity Steering Committee, in which current cyber threats, program performance, and ongoing risk mitigations are regularly reviewed . Cybersecurity related risks are also integrated into our overall enterprise risk management ("ERM") process. These risks are included in the risk universe that the ERM function evaluates to assess top enterprise risks on an annual basis and is reviewed and evaluated by the Board of Directors. The Board of Directors is also apprised of cybersecurity issues or incidents deemed to have a moderate or higher business impact as they arise, even if considered immaterial.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Upon escalation, the Cybersecurity Steering Committee will review all inputs, assess the materiality of the incident, and then brief the Board of Directors on the determination and on how management intends to respond.
Cybersecurity Risk Role of Management [Text Block]	Our global information security organization, led by our CISO, is responsible for our overall information security strategy , policy, security engineering, operations, and cyber threat detection and response . Our CISO is an experienced cybersecurity senior executive with more than 25 years of experience building and leading cybersecurity, risk management and information technology teams. The information security organization manages and continually enhances a robust enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing system resilience and deploying highly proficient detection and response capabilities in an effort to minimize the business impact should an incident occur. Central to this organization is our global cyber operations team, which is responsible for the protection, detection, and response capabilities used in the defense of critical data and enterprise computing services. We also have a corporate-wide insider threat detection program to proactively identify external and internal threats and mitigate those threats in a timely manner. Our broader Teradyne employee community also has a key role in our cybersecurity defenses and is immersed in a comprehensive training and awareness curriculum to build and promote a corporate culture supportive of security. Third parties also play a role in our cybersecurity. We engage third-party services to provide 24x7x365 monitoring, escalation, and response to cyber events. In addition to consulting on best practices, we leverage third parties for independent evaluations of our security controls through penetration testing and independent audits. These evaluations include testing both the design and operational effectiveness of security controls. We also share and receive threat intelligence with our industry peers, cybersecurity associations, and our cyber controls vendors. We rely on contract manufacturing organizations and distributors to deliver our products to our customers, and a cybersecurity incident at one of these organizations or a key supplier could materially adversely impact us. We assess third party and supply chain cybersecurity controls through risk monitoring services tailored to align with our risk policy. Notwithstanding the extensive approach we take to cybersecurity, we may not be successful in preventing or mitigating a cybersecurity incident that could have a material adverse effect on us, either directly within our managed environment or indirectly via a third-party partner or supply chain vendor. Periodically we have a recognized independent security expert firm to assess our cyber security maturity along with risks and provide feedback on where we should continue to improve to mitigate exposures. We share this review with our Board and develop a security roadmap which incorporates this feedback. Additionally, for our business that supports the defense and aerospace sector, we must comply with extensive regulations, including requirements imposed by the Defense Federal Acquisition Regulation Supplement ("DFARS") related to adequately safeguarding controlled unclassified information ("CUI") and reporting cybersecurity incidents to the DoD . We have implemented cybersecurity policies and frameworks based on industry and governmental standards to align closely with DoD requirements, instructions, and guidance. Moreover, we are pursuing the necessary controls to support the Cybersecurity Maturity Model Certification ("CMMC") program, DoD’s program to ensure members of the defense industrial base meet cybersecurity requirements for handling CUI and federal contract information. We believe we are well positioned to meet the requirements of the CMMC and are preparing for certification once the requirements are effective.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our CISO is an experienced cybersecurity senior executive with more than 25 years of experience building and leading cybersecurity, risk management and information technology teams. The information security organization manages and continually enhances a robust enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing system resilience and deploying highly proficient detection and response capabilities in an effort to minimize the business impact should an incident occur. Central to this organization is our global cyber operations team, which is responsible for the protection, detection, and response capabilities used in the defense of critical data and enterprise computing services. We also have a corporate-wide insider threat detection program to proactively identify external and internal threats and mitigate those threats in a timely manner. Our broader Teradyne employee community also has a key role in our cybersecurity defenses and is immersed in a comprehensive training and awareness curriculum to build and promote a corporate culture supportive of security.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Additionally, for our business that supports the defense and aerospace sector, we must comply with extensive regulations, including requirements imposed by the Defense Federal Acquisition Regulation Supplement ("DFARS") related to adequately safeguarding controlled unclassified information ("CUI") and reporting cybersecurity incidents to the DoD . We have implemented cybersecurity policies and frameworks based on industry and governmental standards to align closely with DoD requirements, instructions, and guidance. Moreover, we are pursuing the necessary controls to support the Cybersecurity Maturity Model Certification ("CMMC") program, DoD’s program to ensure members of the defense industrial base meet cybersecurity requirements for handling CUI and federal contract information. We believe we are well positioned to meet the requirements of the CMMC and are preparing for certification once the requirements are effective.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Central to this organization is our global cyber operations team, which is responsible for the protection, detection, and response capabilities used in the defense of critical data and enterprise computing services. We also have a corporate-wide insider threat detection program to proactively identify external and internal threats and mitigate those threats in a timely manner. Our broader Teradyne employee community also has a key role in our cybersecurity defenses and is immersed in a comprehensive training and awareness curriculum to build and promote a corporate culture supportive of security.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

The Company

The Company	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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 consist primarily of collaborative robotic arms and autonomous mobile robots 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; • robotics (“Robotics”) products; and • defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, circuit-board test and inspection (“Production Board Test”) systems, and wireless test systems (referred collectively as "All Other").

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Accounting Policies	B. ACCOUNTING POLICIES The consolidated financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions are eliminated. Certain prior years’ amounts were reclassified to conform to the current year presentation. Preparation of Financial Statements and Use of Estimates The preparation of consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, management evaluates its estimates, including those related to revenue, inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, 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 Annual Report on Form 10-K. These estimates may change, as new events occur and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions. Revenue Recognition Revenue from Contracts with Customers In accordance with ASC 606, Teradyne recognizes revenues, when or as control is transferred to a customer. Teradyne’s determination of revenue is dependent upon a five-step process outlined below. • Teradyne accounts for a contract with a customer when there is written approval, the contract is committed, the rights of the parties, including payment terms, are identified, the contract has commercial substance and consideration is probable of collection. • Teradyne periodically enters into contracts with customers in which a customer may purchase a combination of goods and services, such as products with extended warranty obligations. Teradyne determines performance obligations by assessing whether the products or services are distinct from the other elements of the contract. In order to be distinct, the product or service must perform either on its own or with readily available resources and must be separate within the context of the contract. • Teradyne determines the transaction price to be the amount of consideration to which Teradyne expects to be entitled to, which is generally at contractually stated prices. • Transaction price is allocated to each individual performance obligation based on the standalone selling price of that performance obligation. Teradyne uses standalone transactions when available to value each performance obligation. If standalone transactions are not available, Teradyne will estimate the standalone selling price through market assessments or cost plus a reasonable margin analysis. Any discounts from standalone selling price are spread proportionally to each performance obligation. • In order to determine the appropriate timing for revenue recognition, Teradyne first determines if the transaction meets any of three criteria for over time recognition. If the transaction meets the criteria for over time recognition, Teradyne recognizes revenue as the good or service is delivered. Teradyne uses input variables such as hours or months utilized or costs incurred to determine the amount of revenue to recognize in a given period. Input variables are used as they best align consumption with benefit to the customer. For transactions that do not meet the criteria for over time recognition, Teradyne will recognize revenue at a point in time based on an assessment of the five criteria for transfer of control. Teradyne has concluded that revenue should be recognized when shipped or delivered based on contractual terms. Typically, acceptance of Teradyne’s products and services is a formality as Teradyne delivers similar systems, instruments and robots to standard specifications. In cases where acceptance is not deemed a formality, Teradyne will defer revenue recognition until customer acceptance. Performance Obligations Products Teradyne products consist primarily of semiconductor test systems and instruments, defense/aerospace test instrumentation and systems, storage test systems and instruments, circuit-board test and inspection systems and instruments, wireless test systems and robotics products. Teradyne’s hardware is typically recognized at a point in time upon transfer of control to the customer. Services Teradyne services consist of extended warranties, training and application support, service agreements, post contract customer support (“PCS”) and replacement parts. Each service is recognized based on relative standalone selling price. Extended warranty, training and support, service agreements and PCS are recognized over time based on the period of service. Replacement parts are recognized at a point in time upon transfer of control to the customer. Teradyne does not allow customer returns or provide refunds to customers for any products or services. Teradyne products include a standard 12 -month warranty. This warranty is not considered a distinct performance obligation because it does not obligate Teradyne to provide a separate service to the customer and it cannot be purchased separately. Cost related to warranties are included in cost of revenues when product revenues are recognized. As of December 31, 2024 and 2023, deferred revenue and customer advances consisted of the following and are included in the short and long-term deferred revenue and customer advances: 2024 2023 (in thousands) Maintenance, service and training $ 58,473 $ 66,458 Customer advances, undelivered elements and other 48,118 35,731 Extended warranty 41,624 34,897 Total deferred revenue and customer advances $ 148,215 $ 137,086 Product Warranty Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities: Amount (in thousands) Balance at December 31, 2021 $ 24,577 Accruals for warranties issued during the period 21,851 Accruals related to pre-existing warranties ( 5,618 ) Settlements made during the period ( 26,629 ) Balance at December 31, 2022 14,181 Accruals for warranties issued during the period 21,644 Accruals related to pre-existing warranties ( 1,576 ) Settlements made during the period ( 18,551 ) Balance at December 31, 2023 15,698 Accruals for warranties issued during the period 11,315 Accruals related to pre-existing warranties ( 1,078 ) Settlements made during the period ( 12,973 ) Balance at December 31, 2024 $ 12,962 When Teradyne receives revenue for extended warranties, beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances: Amount (in thousands) Balance at December 31, 2021 $ 64,168 Deferral of new extended warranty revenue 33,686 Recognition of extended warranty deferred revenue ( 41,674 ) Balance at December 31, 2022 56,180 Deferral of new extended warranty revenue 14,330 Recognition of extended warranty deferred revenue ( 35,613 ) Balance at December 31, 2023 34,897 Deferral of new extended warranty revenue 29,990 Recognition of extended warranty deferred revenue ( 23,263 ) Balance at December 31, 2024 $ 41,624 Accounts Receivable and Allowance for Credit Losses Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Teradyne maintains allowances for estimated losses resulting from the inability of its customers to make required payments. Estimated allowances for credit losses are reviewed periodically taking into account the customer’s recent payment history, the customer’s current financial statements and other information regarding the customer’s creditworthiness. Account balances are written off against the allowance when it is determined the receivable will not be recovered. Teradyne sells certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. Teradyne accounts for these transactions as sales of receivables and presents cash proceeds as a cash provided by operating activities in the consolidated statements of cash flows. Total trade accounts receivable sold under the factoring agreements were $ 129.0 million and $ 243.5 million during 2024 and 2023 , respectively. Factoring fees for the sales of receivables are recorded in interest expense and are not material. Equity Method Investments Teradyne accounts for investments using the equity method of accounting when it has significant influence over the financial and operating policies, but not control, of the investee. The equity method investments are initially recorded at cost and included in ‘Equity method investment’ in the consolidated balance sheet. Teradyne records its share of investee's net income or loss and other comprehensive income, and the amortization of equity method basis difference, calculated as the difference between the investment and the amount of underlying equity in net assets acquired, on a 3-month lag, which is applied consistently from period to period. Teradyne's share of investee's net income and the amortization of equity method basis difference are reported in ‘Equity in net earnings of affiliate’ in the consolidated statement of operations. Teradyne includes its share of investee's other comprehensive income and a cumulative translation adjustment in the consolidated statements of comprehensive income. Teradyne monitors on an ongoing basis its equity method investments for indicators of other-than-temporary declines in fair value below carrying value. Inventories Inventories are stated at the lower of cost (first-in, first-out basis) or net realizable value. On a quarterly basis, Teradyne uses consistent methodologies to evaluate all inventories for net realizable value. Teradyne records a provision for both excess and obsolete inventory when such write-downs or write-offs are identified through the quarterly review process. The inventory valuation is based upon assumptions about future demand, product mix and possible alternative uses. Investments Teradyne accounts for its investments in debt and equity securities in accordance with the provisions of ASC 320-10, “ Investments—Debt and Equity Securities .” ASC 320-10 requires that certain debt and equity securities be classified into one of three categories; trading, available-for-sale or held-to-maturity securities. On a quarterly basis, Teradyne reviews its investments to identify and evaluate those that have an indication of a potential other-than-temporary impairment. Factors considered in determining whether a loss is other-than-temporary include: • The length of time and the extent to which the market value has been less than cost; • The financial condition and near-term prospects of the issuer; and • The intent and ability to retain the investment in the issuer for a period of time sufficient to allow for any anticipated recovery in market value. Teradyne uses the market and income approach techniques to value its financial instruments and there were no changes in valuation techniques during the twelve months ended December 31, 2024 and 2023. Teradyne measures its debt and equity investments at fair value, in accordance with ASC 820-10, “ Fair Value Measurements and Disclosures. ” ASC 820-10 defines fair value as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants and requires that assets and liabilities carried at fair value be classified and disclosed in one of the following three categories: Level 1: Quoted prices in active markets for identical assets as of the reporting date; Level 2: Inputs other than Level 1, that are observable either directly or indirectly as of the reporting date. For example, a common approach for valuing fixed income securities is the use of matrix pricing. Matrix pricing is a mathematical technique used to value securities by relying on the securities’ relationship to other benchmark quoted prices, and is considered a Level 2 input; or Level 3: Unobservable inputs that are not supported by market data. Unobservable inputs are developed based on the best information available, which might include Teradyne’s own data. Teradyne’s debt investments are classified as Level 2, and equity investments are classified as Level 1. Financial Assets and Financial Liabilities Teradyne records changes in fair value of equity securities directly in earnings and unrealized gains and losses in other (income) expense, net, in accordance with ASU 2016-01, “ Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities .” Prepayments Prepayments consist of the following: 2024 2023 (1) (in thousands) Contract manufacturer and supplier prepayments $ 365,875 $ 502,257 Prepaid maintenance and other services 22,176 17,592 Prepaid taxes 22,211 16,083 Other prepayments 18,824 13,038 Total prepayments $ 429,086 $ 548,970 (1) Excludes $ 5.3 million of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: "Dispositions" for additional information. Retirement and Postretirement Plans Teradyne recognizes net actuarial gains and losses and the change in the fair value of the plan assets in its operating results in the year in which they occur or upon any interim remeasurement of the plans. Teradyne calculates the expected return on plan assets using the fair value of the plan assets. Actuarial gains and losses are generally measured annually as of December 31 and, accordingly, recorded during the fourth quarter of each year or upon any interim remeasurement of the plans. Teradyne reports net periodic pension cost and net periodic postretirement benefit costs in accordance with ASU 2017-07, “ Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost .” The service cost component of net benefit costs is reported in the same line item in the consolidated statement of operations as other employee compensation costs. The non-service components of net benefit costs such as interest cost, expected return on assets, amortization of prior service cost, and actuarial gains or losses, are reported within other (income) expense, net. Goodwill, Intangible and Long-Lived Assets Teradyne accounts for goodwill and intangible assets in accordance with ASC 350-10, “ Intangibles-Goodwill and Other. ” Intangible assets are amortized over their estimated useful economic life and are carried at cost less accumulated amortization. Goodwill is assessed for impairment at least annually in the fourth quarter, as of December 31, on a reporting unit basis, or more frequently when events and circumstances occur indicating that the recorded goodwill may be impaired. In accordance with ASC 350-10, Teradyne has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If Teradyne determines this is the case, Teradyne is required to perform a quantitative goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. If Teradyne determines that it is more likely than not that the fair value of the reporting unit is greater than its carrying amounts, a quantitative goodwill impairment test is not required. In accordance with ASC 360-10, “ Impairment or Disposal of Long-Lived Assets, ” 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. Each impairment test is based on a comparison of the estimated undiscounted cash flows to the recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flows analysis. The cash flows estimates used to determine the impairment, if any, contain management’s best estimates using appropriate assumptions and projections at that time. Business Combination Teradyne recognizes the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. The fair value of identifiable intangible assets is based on detailed cash flows valuations that use information and assumptions provided by management. Teradyne uses all pertinent information known at the time of acquisition to estimate the fair value of contingent consideration at the time of the acquisition using all pertinent information known to us at the time to assess the probability of payment of contingent amounts or through the use of a Monte Carlo simulation model. Teradyne allocates any excess purchase price over the fair value of the net tangible and intangible assets acquired and liabilities assumed to goodwill. The assumptions used in the valuations for our acquisitions may differ materially from actual results depending on performance of the acquired businesses and other factors. While Teradyne believes the assumptions used were appropriate, different assumptions in the valuation of assets acquired and liabilities assumed could have a material impact on the timing and extent of impact on our statements of operations. Goodwill is assigned to reporting units as of the date of the related acquisition. Property, Plant and Equipment Property, plant and equipment are stated at cost and depreciated over the estimated useful lives of the assets. Leasehold improvements and major renewals are capitalized and included in property, plant and equipment accounts, while expenditures for maintenance and repairs and minor renewals are charged to expense. When assets are retired, the assets and related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations. Teradyne provides for depreciation of its assets principally on the straight-line method with the cost of the assets being charged to expense over their useful lives as follows: Buildings 40 years Building improvements 5 to 10 years Leasehold improvements Lesser of lease term or 10 years Furniture and fixtures 10 years Test systems manufactured internally 6 years Machinery, equipment and software 3 to 5 years Test systems manufactured internally are used by Teradyne for customer evaluations and manufacturing and support of its customers. Teradyne depreciates the test systems manufactured internally over a six-year life to cost of revenues, engineering and development, and selling and administrative expenses. Teradyne often sells internally manufactured test equipment to customers. Upon the sale of an internally manufactured test system, the net book value of the system is transferred to inventory and expensed as cost of revenues. The net book value of internally manufactured test systems sold in the years ended December 31, 2024, 2023, and 2022 was $ 4.0 million, $ 2.8 million, and $ 6.6 million, respectively. Convertible Debt Teradyne adopted Accounting Standards Update (“ASU”) ASU 2020-06 – “Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity’s Own Equity,” on January 1, 2022 using the modified retrospective method of adoption. As a result of adoption, Teradyne recorded an increase of $ 1.4 million to current debt for unsettled shares, an increase of $ 1.8 million to deferred tax assets, an increase of $ 6.6 million to long-term debt for unamortized debt discount, and an increase to retained earnings of $ 94.6 million for the reclassification of the equity component. Mezzanine equity representing unsettled shares value was reduced to zero and additional paid-in capital was reduced by $ 100.8 million. In accordance with ASU 2020-06, Teradyne accounts for a convertible debt instrument as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. Unsettled shares are recorded in current debt, and there is no recognition of a debt discount, which was previously amortized to interest expense. Settled shares reduce the outstanding debt balance in an amount equal to the cash paid, but do not result in any gain or loss on extinguishment. We use the if-converted method in the diluted EPS calculation for convertible instruments. Leases Under ASC 842, a contract is or contains a lease when Teradyne has the right to control the use of an identified asset. Teradyne determines if an arrangement is a lease at inception of the contract, which is the date on which the terms of the contract are agreed to and the agreement creates enforceable rights and obligations. The commencement date of the lease is the date that the lessor makes an underlying asset available for use by Teradyne. As of December 31, 2024, Teradyne does not have material leases that have not yet commenced. Teradyne determines if the lease is an operating or finance lease at the lease commencement date based upon the terms of the lease and the nature of the asset. The lease term used to calculate the lease liability includes options to extend or terminate the lease when it is reasonably certain that the option will be exercised. The lease liability is measured at the present value of future lease payments, discounted using the discount rate for the lease at the commencement date. As Teradyne is typically unable to determine the implicit rate, Teradyne uses an incremental borrowing rate based on the lease term and economic environment at commencement date. Teradyne initially measures payments based on an index by using the applicable rate at lease commencement. Variable payments that do not depend on an index are not included in the lease liability and are recognized as they are incurred. The right-of-use (“ROU”) asset is initially measured as the amount of lease liability, adjusted for any initial lease costs, prepaid lease payments, and reduced by any lease incentives. Teradyne’s contracts often include non-lease components such as common area maintenance. Teradyne elected the practical expedient to account for the lease and non-lease components as a single lease component. For leases with a term of one year or less, Teradyne has elected not to record the lease asset or liability. Rent is recognized in the consolidated statement of earnings on a straight-line basis over the lease term. Teradyne includes lease costs within cost of revenues and operating expenses. See Note J: “Leases.” Engineering and Development Costs Teradyne’s products are highly technical and require a large and continuing engineering and development effort. Software development costs incurred prior to the establishment of technological feasibility are charged to expense. Software development costs incurred subsequent to the establishment of technological feasibility are capitalized until the product is available for release to customers. To date, the period between achieving technological feasibility and general availability of the product has been short and software development costs eligible for capitalization have not been material. Engineering and development costs are expensed as incurred and consist primarily of salaries, contractor fees including non-recurring engineering charges related to product design, allocated facility costs, depreciation, and tooling costs. Stock Compensation Plans and Employee Stock Purchase Plan Stock-based compensation expense is based on the grant-date fair value estimated in accordance with the provisions of ASC 718-10, “ Compensation-Stock Compensation .” Teradyne elects to account for forfeitures by applying an estimated forfeiture rate and recognizes compensation costs only for those stock-based compensation awards expected to vest. Under its stock compensation plans, Teradyne has granted stock options, restricted stock units and performance-based restricted stock units, and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”). Excess tax benefits or tax deficiencies are recognized as a discrete tax benefit or discrete tax expense to the current income tax provision in Teradyne’s consolidated statements of operations, all excess tax benefits related to share-based payments are reported as cash flows from operating activities, and all cash payments made to taxing authorities on the employees’ behalf for withheld shares are presented as financing activities on the statement of cash flows. Income Taxes Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The measurement of deferred tax assets is reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be realized. Teradyne performed the required assessment of positive and negative evidence regarding the realization of the net deferred tax assets in accordance with ASC 740, “Accounting for Income Taxes.” This assessment included the evaluation of scheduled reversals of deferred tax liabilities, estimates of projected future taxable income and tax-planning strategies. Although realization is not assured, based on its assessment, Teradyne concluded that it is more likely than not that such assets, net of the existing valuation allowance, will be realized. Advertising Costs Teradyne expenses all advertising costs as incurred. Advertising costs were $ 16.1 million, $ 15.5 million and $ 17.3 million in 2024, 2023 and 2022 , respectively. Translation of Non-U.S. Currencies The functional currency for all non-U.S. subsidiaries is the U.S. dollar, except for Robotics and Lemsys for which the local currency is its functional currency. All foreign currency denominated monetary assets and liabilities are remeasured on a monthly basis into the functional currency using exchange rates in effect at the end of the period. All foreign currency denominated non-monetary assets and liabilities are remeasured into the functional currency using historical exchange rates. Net foreign exchange gains and losses resulting from remeasurement are included in other (income) expense, net. For Robotics and Lemsys, assets and liabilities are translated into U.S. dollars using exchange rates in effect at the end of the period. Revenues and expense amounts are translated using an average of exchange rates in effect during the period. Translation adjustments are recorded within accumulated other comprehensive income (loss) on the balance sheet. Net foreign exchange gains and losses resulting from remeasurement are included in other (income) expense, net. For the years ended December 31, 2024, 2023 and 2022, losses (gains) from the remeasurement of the monetary assets and liabilities denominated in foreign currencies were $ 2.8 million, $ 10.9 million, and $ 10.8 million, respectively. These amounts do not reflect the corresponding (gains) losses from foreign exchange contracts. See Note I: “Financial Instruments” regarding foreign exchange contracts. Net Income per Common Share Basic net income per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, diluted net income per common share is calculated by dividing net income by the sum of the weighted average number of common shares plus common stock equivalents, if applicable. With respect to its convertible debt issued in 2016, Teradyne was required to settle the principal of the convertible debt in cash; accordingly, the principal amount was excluded from the determination of diluted earnings per share. As a result, Teradyne is accounting for the conversion spread using the treasury stock method. Comprehensive Income Comprehensive income includes net income, unrealized pension and postretirement prior service costs and benefits, unrealized gains and losses on investments in debt marketable securities, unrealized gains and losses on cash flow hedge and foreign currency translation adjustment.

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	12 Months Ended
	Dec. 31, 2024
Accounting Changes and Error Corrections [Abstract]
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 requires 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, we are required to disclose the title and position of the CODM. Teradyne retrospectively adopted and complied with this standard for the annual period ending December 31, 2024. Teradyne updated our segment disclosures to comply with the requirements. See Note U: "Segment, Geographic and Significant Customer Information." The adoption of this standard had no impact on Teradyne results of operations, cash flows or financial condition. In December 2023, the 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. Teradyne is currently evaluating the impact of this new standard. In November 2024, the FASB issued ASU 2024-03- "Income Statement - Reporting Comprehensive Income -Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses" , which requires disclosure of additional expense information on an annual and interim basis, including the amounts of inventory purchases, employee compensation, depreciation and intangible amortization included within each income statement expense caption. This standard is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The amendments in this update should be applied on a prospective basis, but retrospective application is permitted. Teradyne is currently evaluating the impact of this new standard.

Revenue

Revenue	12 Months Ended
	Dec. 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 Robotics Reportable Segments All Other System-on-a-chip Memory IST Corporate Total (in thousands) For the Year Ended December 31, 2024 (1) Timing of Revenue Recognition Point in Time $ 1,255,579 $ 472,279 $ 63,288 $ 356,384 $ 2,147,530 $ 266,955 $ — $ 2,414,485 Over Time 281,545 29,509 21,720 $ 8,464 341,238 64,157 — $ 405,395 Total $ 1,537,124 $ 501,788 $ 85,008 $ 364,848 $ 2,488,768 $ 331,112 $ — $ 2,819,880 Geographical Market Asia Pacific $ 1,400,149 $ 466,214 $ 78,719 $ 69,353 $ 2,014,435 $ 113,263 $ — $ 2,127,698 Americas 92,386 15,017 6,289 $ 147,607 261,299 174,084 — $ 435,383 Europe, Middle East and Africa 44,589 20,557 — $ 147,888 213,034 43,765 — $ 256,799 Total $ 1,537,124 $ 501,788 $ 85,008 $ 364,848 $ 2,488,768 $ 331,112 $ — $ 2,819,880 For the Year Ended December 31, 2023 (1) Timing of Revenue Recognition Point in Time $ 1,141,882 $ 356,417 $ 115,220 $ 363,238 $ 1,976,757 $ 282,558 $ — $ 2,259,315 Over Time 290,739 29,598 23,332 $ 11,945 355,614 61,369 — $ 416,983 Total $ 1,432,621 $ 386,015 $ 138,552 $ 375,183 $ 2,332,371 $ 343,927 $ — $ 2,676,298 Geographical Market Asia Pacific $ 1,214,322 $ 366,151 $ 135,502 $ 73,736 $ 1,789,711 $ 103,300 $ — $ 1,893,011 Americas 117,728 11,367 3,050 $ 147,952 280,097 199,299 — $ 479,396 Europe, Middle East and Africa 100,571 8,497 — $ 153,495 262,563 41,328 — $ 303,891 Total $ 1,432,621 $ 386,015 $ 138,552 $ 375,183 $ 2,332,371 $ 343,927 $ — $ 2,676,298 For the Year Ended December 31, 2022 (1) Timing of Revenue Recognition Point in Time $ 1,445,238 $ 344,693 $ 248,919 $ 391,326 $ 2,430,176 $ 342,195 $ 251 $ 2,772,622 Over Time 261,646 29,013 21,094 $ 11,812 323,565 58,858 — $ 382,423 Total $ 1,706,884 $ 373,706 $ 270,013 $ 403,138 $ 2,753,741 $ 401,053 $ 251 $ 3,155,045 Geographical Market Asia Pacific $ 1,514,964 $ 360,176 $ 266,729 $ 89,654 $ 2,231,523 $ 168,388 $ — $ 2,399,911 Americas 122,575 11,987 3,284 $ 147,416 285,262 190,106 251 $ 475,619 Europe, Middle East and Africa 69,345 1,543 — $ 166,068 236,956 42,559 — $ 279,515 Total $ 1,706,884 $ 373,706 $ 270,013 $ 403,138 $ 2,753,741 $ 401,053 $ 251 $ 3,155,045 (1) Includes $ 3.7 m illion, $ 5.2 million and $ 8.2 million in 2024, 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.” Contract Balances For the years ended December 31, 2024, 2023 and 2022, Teradyne recognized $ 72.7 million, $ 108.1 million and $ 112.4 million, respectively, that was included within the deferred revenue and customer advances balances at the beginning of the period. This revenue primarily relates to undelivered hardware, extended warranties, training, application support, and post contract support. Each of these represents a distinct performance obligation. As of December 31, 2024, Teradyne had $ 1,162.2 million of unsatisfied performance obligations. Teradyne expects to recognize 88 % of the remaining performance obligation in the next 12 months and the remainder in 1 - 3 year s.

Dispositions

Dispositions	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	E. DISPOSITIONS On May 27, 2024, Teradyne completed the sale of the Device Interface Solutions ("DIS") business, a component of the Semiconductor Test segment, to Technoprobe S.p.A. ("Technoprobe") for $ 85.0 million in cash, net of cash and cash equivalents sold, and a customary working capital adjustment. The sale resulted in a pre-tax gain of $ 57.1 million recorded as 'Gain on sale of business' in the consolidated statement of operations. The transaction did not meet the criteria to be classified as a discontinued operation, as it did not represent a strategic shift that will have a major effect on operations and financial results. Assets and liabilities related to the DIS sale agreement met the criteria and were classified as held for sale in Teradyne’s consolidated balance sheet as of December 31, 2023, as follows: December 31, 2023 (in thousands) Current assets: Inventories, net $ 17,952 Prepayments 5,298 Total current assets held for sale 23,250 Property, plant and equipment, net 8,986 Operating lease right-of-use assets, net 2,545 Total assets held for sale $ 34,781 Current liabilities: Accounts payable $ 6,356 Other accrued liabilities 552 Operating lease liabilities 471 Total current liabilities held for sale 7,379 Long-term operating lease liabilities 2,000 Total liabilities held for sale $ 9,379 Net assets held for sale $ 25,402

Equity Method Investment

Equity Method Investment	12 Months Ended
	Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investment	F. EQUITY METHOD INVESTMENT On May 27, 2024, Teradyne paid 483.1 million Euros, equivalent to $ 524.1 million, to purchase a combination of previously issued and outstanding shares and shares newly issued by Technoprobe, S.p.A. ("Technoprobe"). The shares purchased represent 10 % of the issued and outstanding shares of Technoprobe. Teradyne also received a board seat as part of the purchase. Teradyne accounts for this investment using the equity method as a result of being able to exercise significant influence over the operating and financial decisions of Technoprobe. As of December 31, 2024, $ 494.5 million was recorded as 'Equity method investment' in the consolidated balance sheets. (in thousands) Balance at May 27, 2024 $ 524,060 Other comprehensive income related to investment ( 22,355 ) Equity in net earnings of affiliate ( 7,211 ) Balance at December 31, 2024 $ 494,494 Based on the quoted closing price of Technoprobe stock as of December 31, 2024, the fair value of the publicly traded investment was $ 389.5 million. Evaluation of Technoprobe's financial condition and Teradyne's ability to hold the investment indicate there was no other-than-temporary impairment as of December 31, 2024. Teradyne's equity method basis difference was calculated as the difference between the investment and the amount of underlying equity in net assets acquired. The equity method basis difference calculated at acquisition attributable to developed technology, customer relationships, trade name, property, plant and equipment, inventory, and deferred tax liability was $ 200.9 million. The basis differences, net of tax, will be amortized over their estimated useful lives. Teradyne made an accounting policy election to report its share of Technoprobe's results on a 3-month lag, which is applied consistently from period to period. Teradyne records its share of Technoprobe's net income or loss and the amortization of equity method basis difference, as 'Equity in net earnings of affiliate' in the consolidated statements of operations. Teradyne includes its share of Technoprobe's other comprehensive income and a cumulative translation adjustment in the consolidated statements of comprehensive income.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2024
Inventory Disclosure [Abstract]
Inventories	G. INVENTORIES Inventories, net consisted of the following at December 31, 2024 and 2023: 2024 2023 (1) (in thousands) Raw material $ 225,915 $ 258,422 Work-in-process 41,964 26,851 Finished goods 30,613 24,701 $ 298,492 $ 309,974 (1) Excludes $ 18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information. Inventory reserves at December 31, 2024, and December 31, 2023, were $ 141.4 million and $ 136.0 million, respectively.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	H. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment, net consisted of the following at December 31, 2024 and 2023: 2024 2023 (1) (in thousands) Land $ 19,409 $ 19,487 Buildings 183,371 127,705 Machinery, equipment and software 1,157,784 1,047,235 Furniture and fixtures 28,432 28,093 Leasehold improvements 67,387 66,777 Construction in progress 5,678 54,799 1,462,061 1,344,096 Less: accumulated depreciation 953,890 898,604 $ 508,171 $ 445,492 (1) Excludes $ 9.0 million of property, plant and equipment, net classified as assets held for sale. See Note E: "Dispositions" for additional information. Depreciation of property, plant and equipment for the years ended December 31, 2024, 2023, and 2022 was $ 101.0 million, $ 92.1 million, and $ 90.8 million, respectively. As of December 31, 2024 and 2023, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $ 25.7 million and $ 5.1 million, respectively. As of December 31, 2024 and 2023, the accumulated depreciation on these test systems was $ 5.5 million and $ 4.9 million, respectively.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Financial Instruments	I. 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 years ended December 31, 2024 and 2023, there were no transfers in or out of Level 1, Level 2, or Level 3 financial instruments. Realized gains recorded in 2024, 2023, and 2022 were $ 2.2 million, $ 0.6 million, and $ 0.8 million, respectively. Realized losses recorded in 2024, 2023, and 2022 were $ 0.3 million, $ 0.3 million, and $ 0.1 million, respectively. Realized gains and losses are included in other (income) expense, net. Unrealized gains on equity securities recorded during the years ended December 31, 2024, 2023 and 2022 were $ 6.7 million, $ 8.9 million and $ 1.9 million, respectively. Unrealized losses on equity securities recorded during the years ended December 31, 2024, 2023, and 2022 were $ 1.2 million, $ 1.7 million and $ 11.6 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 December 31, 2024 and 2023 : December 31, 2024 Quoted Prices Significant Significant Total (in thousands) Assets Cash $ 261,176 $ — $ — $ 261,176 Cash equivalents 283,037 9,141 — 292,178 Available for sale securities: U.S. Treasury securities — 44,942 — 44,942 Corporate debt securities — 35,696 — 35,696 Certificates of deposit and time deposits — 21,689 — 21,689 Debt mutual funds 8,951 — — 8,951 U.S. government agency securities — 3,970 — 3,970 Non-U.S. government securities — 773 — 773 Equity securities: Mutual funds 54,412 — — 54,412 Total $ 607,576 $ 116,211 $ — $ 723,787 Derivative assets — 1,665 — 1,665 Total $ 607,576 $ 117,876 $ — $ 725,452 Liabilities Derivative liabilities — 1,324 — 1,324 Total $ — $ 1,324 $ — $ 1,324 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 544,213 $ 9,141 $ — $ 553,354 Marketable securities — 46,312 — 46,312 Long-term marketable securities 63,363 60,758 — 124,121 Other current assets — 1,665 — 1,665 Total $ 607,576 $ 117,876 $ — $ 725,452 Liabilities Other current liabilities $ — $ 1,324 $ — $ 1,324 Total $ — $ 1,324 $ — $ 1,324 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 Total $ 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 Other current assets — 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 December 31, 2024 and 2023 were as follows: December 31, 2024 December 31, 2023 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 553,354 $ 553,354 $ 757,571 $ 757,571 Marketable securities 170,433 170,433 179,588 179,588 Derivative assets 1,665 1,665 18,746 18,746 Liabilities Derivative liabilities 1,324 1,324 2,545 2,545 The fair values of accounts receivable, net and accounts payable approximate the carrying amount due to the short-term nature of these instruments. The following tables summarize the composition of available-for-sale marketable securities at December 31, 2024 and 2023: December 31, 2024 Available-for-Sale Cost Unrealized Unrealized Fair Market Fair Market (in thousands) U.S. Treasury securities $ 49,879 $ 14 $ ( 4,951 ) $ 44,942 $ 30,530 Corporate debt securities 40,395 79 ( 4,778 ) 35,696 27,824 Certificates of deposit and time deposits 21,689 — — 21,689 — Debt mutual funds 9,299 — ( 348 ) 8,951 3,238 U.S. government agency securities 3,966 5 ( 1 ) 3,970 1,946 Non-U.S. government securities 773 — — 773 — $ 126,001 $ 98 $ ( 10,078 ) $ 116,021 $ 63,538 Reported as follows: Cost Unrealized Unrealized Fair Market Fair Market (in thousands) Marketable securities $ 46,349 $ 16 $ ( 53 ) $ 46,312 $ 10,454 Long-term marketable securities 79,652 82 ( 10,025 ) $ 69,709 53,084 $ 126,001 $ 98 $ ( 10,078 ) $ 116,021 $ 63,538 December 31, 2023 Available-for-Sale Cost Unrealized Unrealized Fair Market 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 Market 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 December 31, 2024, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $ 22.6 million and $ 40.9 million, respectively. As of December 31, 2023, the fair market value of investments with unrealized losses 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 December 31, 2024 and 2023 were not other than temporary. The contractual maturities of investments in available-for-sale marketable securities held at December 31, 2024 were as follows: Cost Fair Value (in thousands) Due within one year $ 46,349 $ 46,312 Due after 1 year through 5 years 25,554 25,316 Due after 5 years through 10 years 8,648 8,232 Due after 10 years 36,151 27,210 Total $ 116,702 $ 107,070 Contractual maturities of investments in available-for-sale marketable securities held at December 31, 2024 exclude debt mutual funds with the fair market value of $ 9.0 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 December 31, 2024 and 2023, to hedge certain of its local currency balance sheet assets and liabilities, 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 December 31, 2024 December 31, 2023 (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Taiwan dollar $ 14.5 $ 42.7 U.S. dollar/Japanese yen 12.6 11.0 Danish krone/Chinese yuan 10.5 — U.S. dollar/Korean won 4.2 7.2 U.S. dollar/British pound sterling 1.2 1.5 U.S. dollar/Danish krone — 36.0 Singapore dollar/U.S. dollar 28.9 16.6 Euro/U.S. dollar 22.3 25.3 Danish krone/U.S. dollar 16.9 0.7 Philippine peso/U.S. dollar 9.4 10.1 Chinese yuan/U.S. dollar 1.6 1.0 $ 122.1 $ 152.1 The change in the fair value of the outstanding contracts was a loss of $ 0.6 million and a loss of $ 1.8 million, respectively, at December 31, 2024 and 2023. 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 December 31, 2024 and 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 December 31, 2024 December 31, 2023 (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Japanese yen $ 15.6 $ 35.5 Total $ 15.6 $ 35.5 The change in the fair value of the outstanding cash flow hedge contracts was a gain of $ 0.9 million at December 31, 2024 and 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 the agreement to acquire 10 % investment in Technoprobe S.p.A, Teradyne purchased a call option to buy 481.0 million Euros. The expiration date of the option was April 26, 2024 . At December 31, 2023, the fair value of the outstanding contract was $ 17.4 million and an unrealized gain of $ 7.5 million was recorded in other (income) expense, net. On April 12, 2024, Teradyne entered into a forward to buy 481.0 million Euros which expired on May 23, 2024 . For the year ended December 31, 2024, a realized loss of $ 9.8 million was recorded in 'Other (income) expense, net' in the consolidated statement of operations. T he following table summarizes the fair value of derivative instruments as of December 31, 2024 and 2023: Balance Sheet Location December 31, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Other current assets $ 725 $ 733 Foreign exchange option contracts Other current assets — 17,364 Foreign exchange forward contracts Other current liabilities ( 1,324 ) ( 2,545 ) Derivatives designated as hedging instruments: Foreign exchange forward contracts Other current assets 940 648 Total derivatives $ 341 $ 16,200 The following table summarizes the effect of derivative instruments in the statements of operations recognized for the years ended December 31, 2024, 2023, and 2022: Location of (Gains) Losses December 31, December 31, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts (1) Other (income) expense, net $ 3,226 $ ( 1,843 ) $ ( 2,482 ) Foreign exchange option contracts Other (income) expense, net 9,764 ( 7,464 ) — Derivatives designated as hedging instruments: Foreign exchange forward and option contracts Revenue ( 2,402 ) ( 3,127 ) ( 251 ) Total derivatives $ 10,588 $ ( 12,434 ) $ ( 2,733 ) (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 years ended December 31, 2024, 2023 and 2022, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 2.8 million, $ 10.9 million, and $ 10.8 million, respectively. See Note K: “Debt” regarding derivatives related to the convertible senior notes. Concentration of Credit Risk Financial instruments which potentially subject us to concentrations of credit risk consist principally of cash equivalents, marketable securities, forward currency contracts and accounts receivable. Our cash equivalents consist primarily of money market funds invested in U.S. Treasuries and government agencies. Our fixed income available-for-sale marketable securities have a minimum rating of AA by one or more of the major credit rating agencies. We place forward currency contracts with high credit-quality financial institutions in order to minimize credit risk exposure. Concentrations of credit risk with respect to accounts receivable are limited due to the large number of geographically dispersed customers. We perform ongoing credit evaluations of our customers’ financial condition and from time to time may require customers to provide a letter of credit from a bank to secure accounts receivable. As of December 31, 2024, two customers of our Semiconductor Test segment, Taiwan Semiconductor Manufacturing Co. and SK Hynix Inc, each accounted for 10 % of our accounts receivable balance. As of December 31, 2023, a customer of our Semiconductor Test segment, Texas Instruments Inc., accounted for 18 % of our accounts receivable balance.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases, Operating [Abstract]
Leases	J. LEASES Teradyne has facility and auto leases, which are accounted for as operating leases. Teradyne’s facility leases are primarily used for administrative functions, research and development, manufacturing, and storage and distribution. Remaining lease terms range from less than one year to twelve years. For the years ended December 31, 2024, 2023 and 2022, total lease expense was $ 43.6 million, $ 42.7 million, and $ 40.1 million, respectively, and included $ 15.9 million, $ 15.5 million, and $ 14.1 million, respectively, of variable lease costs and $ 1.3 million, $ 1.3 million, and $ 2.0 million, respectively, of costs related to short-term leases, which are not recorded on the consolidated balance sheets. At December 31, 2024, the weighted average remaining lease term and weighted average discount rate for operating leases was 5.8 years and 5.5 % , respectively. At December 31, 2023, the weighted average remaining lease term and weighted average discount rate for operating leases was 6.3 years and 5.2 % , respectively. Supplemental cash flows information related to leases was as follows: For the Years Ended December 31, December 31, December 31, (in thousands) Cash paid for amounts included in the measurement of lease $ 23,990 $ 26,059 $ 20,775 Right-of-use assets obtained in exchange for new lease obligations 18,358 17,987 26,149 Maturities of lease liabilities as of December 31, 2024 were as follows: Operating Lease (in thousands) 2025 $ 21,872 2026 17,729 2027 13,991 2028 9,608 2029 7,332 Thereafter 20,760 Total lease payments 91,292 Less imputed interest ( 14,671 ) Total lease liabilities $ 76,621

Debt

Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	K. 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 Teradyne's shareholders’ equity. The Warrant Transactions, which began expiring on March 18, 2024 , and continued to expire through July 10, 2024 , covered, subject to customary anti-dilution adjustments, approximately 1.3 million shares of common stock. During the year ended December 31, 2024, 14.7 million warrants expired, resulting in the issuance of 10.0 million shares of Teradyne common stock, respectively. As of the final date of expiration, July 10, 2024, the strike price of the warrants was approximately $ 39.35 per share. The Warrant Transactions resulted 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, exceeded the applicable strike price of the warrants. The interest expense on Teradyne's senior notes for the years ended December 31, 2024, and December 31, 2023, was as follows: For the Years Ended December 31, December 31, (in thousands) Contractual interest expense on the coupon $ — $ 312 Amortization of the issuance fees recognized as interest expense — 113 Total interest expense on the convertible debt $ — $ 425 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 provides for a three-year , senior secured revolving credit facility of $ 400.0 million (the “Credit Facility”). On December 10, 2021, the Credit Agreement was amended to extend 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. On November 7, 2023, the Credit Agreement was amended to allow for the purchase of the shares of Technoprobe. 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. On May 16, 2024, Teradyne borrowed $ 185.0 million under the Credit Agreement to support the acquisition of 10 % of the issued and outstanding shares of Technoprobe. Teradyne fully repaid its borrowings on the revolving credit facility prior to December 31, 2024 . There was no outstanding revolver balance as of December 31, 2024. As of February 20, 2025 , the Credit Agreement was undrawn and Teradyne was in compliance with all covenants under the Credit Agreement.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	L. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Changes in accumulated other comprehensive income (loss), which is presented net of tax, consist of the following: Foreign Unrealized Unrealized (Losses) Gains on Retirement Total (in thousands) 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, net of tax of 0 , $ 568 , $ 1,537 , $ 0 , respectively 17,407 2,423 5,464 — 25,294 Amounts reclassified from accumulated other comprehensive 0 , $ 12 , $( 686 ), $( 2 ), — 44 ( 2,441 ) ( 7 ) ( 2,404 ) Net current period other comprehensive gain (loss), net of tax 0 $ 580 , $ 851 , $( 2 ), respectively 17,407 2,467 3,023 ( 7 ) 22,890 Balance at December 31, 2023, net of tax of $ 0 , $( 1,728 ), $ 143 , 1,132 ), respectively $ ( 22,442 ) $ ( 6,194 ) $ 506 $ 1,152 $ ( 26,978 ) Other comprehensive gain before reclassifications, net of tax of 0 , $( 470 ), $ 593 , $ 0 , respectively ( 52,847 ) ( 1,699 ) 2,100 — ( 52,446 ) Amounts reclassified from accumulated other comprehensive 0 , $ 24 , $( 527 ), $( 2 ), — 86 ( 1,875 ) ( 7 ) ( 1,796 ) Net current period other comprehensive gain (loss), net of tax 0 $( 446 ), $ 66 , $( 2 ), respectively ( 52,847 ) ( 1,613 ) 225 ( 7 ) ( 54,242 ) Balance at December 31, 2024, net of tax of $ 0 , $( 2,174 ), $ 209 , 1,134 ), respectively $ ( 75,289 ) $ ( 7,807 ) $ 731 $ 1,145 $ ( 81,220 ) Reclassifications out of accumulated other comprehensive income (loss) to the statements of operations for the years ended December 31, 2024, 2023, and 2022, were as follows: Details about Accumulate Other Comprehensive Income (Loss) Components For the years ended Affected Line Item December 31, December 31, December 31, (in thousands) Available-for-sale marketable securities Unrealized (losses) gains, net of tax of $( 24 ), $( 12 ), $( 25 ), $ ( 86 ) $ ( 44 ) $ ( 301 ) Other (income) expense, net Cash flow hedges: Unrealized gains, net of tax of $ 527 , $ 686 , $ 0 , respectively 1,875 2,441 — Revenue Defined benefit pension and postretirement plans: Amortization of prior service benefit, net of tax of $ 2 , $ 2 , $ 2 , 7 7 7 (a) Total reclassifications, net of tax of $ 505 , $ 676 , $( 23 ), respectively $ 1,796 $ 2,404 $ ( 294 ) Net income (a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note Q: “Retirement Plans.”

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	M. GOODWILL AND INTANGIBLE ASSETS Goodwill Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “ Intangibles—Goodwill and Other, ” on December 31 of each fiscal year unless interim indicators of impairment exist. Goodwill is considered to be impaired when the net book value of a reporting unit exceeds its estimated fair value. Teradyne has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If Teradyne determines this is the case, Teradyne is required to perform a quantitative goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. If Teradyne determines that it is more likely than not that the fair value of the reporting unit is greater than its carrying amounts, the quantitative goodwill impairment test is not required. In performing the quantitative goodwill impairment test, Teradyne determines the fair value of a reporting unit using the results derived from an income approach and a market approach, weighting the fair value determined under each approach to determine an estimated fair value for a reporting unit. The income approach is estimated through the discounted cash flows (“DCF”) analysis. Determining fair value requires the exercise of significant judgment, including judgments about appropriate discount rates, perpetual growth rates, and the amount and timing of expected future cash flows. Discount rates are based on a weighted average cost of capital (“WACC”), which represents the average rate a business must pay its providers of debt and equity, plus a risk premium. The WACC used to test goodwill is derived from a group of comparable companies. The cash flows employed in the DCF analysis are derived from internal forecasts and external market forecasts. The market approach estimates the fair value of the reporting unit by utilizing the market comparable method which is based on revenue and earnings multiples from comparable companies. If the estimated fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is not impaired. If the carrying amount of a reporting unit exceeds its estimated fair value, then the goodwill is written down by the amount that carrying value exceeds the fair value of the reporting unit, but not below zero. In the fourth quarter of 2024 , Teradyne performed the annual goodwill impairment test, completing a quantitative assessment for the Robotics reporting unit and a qualitative assessment for the Wireless Test reporting unit and for a reporting unit within System Test. There was no impairment as a result of the annual test performed in the fourth quarter of 2024. Key assumptions in the goodwill valuation model are forecasted revenues, discount rate, earnings before interest and taxes, and revenue multiples from comparable companies. A change in any of these key assumptions could result in the reporting unit being impaired in a future period. In the fourth quarter of 2023 , Teradyne performed the annual goodwill impairment test, completing a quantitative assessment for the Robotics reporting unit and a qualitative assessment for the Wireless Test reporting unit and for a reporting unit within System Test reporting units. There was no impairment as a result of the annual test performed in the fourth quarter of 2023. Key assumptions in the goodwill valuation model are forecasted revenues, discount rate, earnings before interest and taxes, and revenue multiples from comparable companies. A change in any of these key assumptions could result in the reporting unit being impaired in a future period. The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2024 and 2023 are as follows: Robotics Semiconductor All Other Total (in thousands) Balance at December 31, 2022 Goodwill $ 383,166 $ 262,077 $ 520,518 $ 1,165,761 Accumulated impairment losses — ( 260,540 ) ( 502,026 ) ( 762,566 ) Total Goodwill 383,166 1,537 18,492 403,195 Foreign currency translation adjustment 12,297 160 — 12,457 Balance at December 31, 2023 Goodwill 395,463 262,237 520,518 1,178,218 Accumulated impairment losses — ( 260,540 ) ( 502,026 ) ( 762,566 ) Total Goodwill 395,463 1,697 18,492 415,652 Foreign currency translation adjustment ( 20,165 ) ( 120 ) — ( 20,285 ) Balance at December 31, 2024 Goodwill 375,298 262,117 520,518 1,157,933 Accumulated impairment losses — ( 260,540 ) ( 502,026 ) ( 762,566 ) Total Goodwill $ 375,298 $ 1,577 $ 18,492 $ 395,367 Intangible Assets Teradyne reviews long-lived assets for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of these assets are no longer appropriate. There were no events or circumstances indicating that the carrying value of intangible and long-lived assets may not be recoverable in 2024, 2023 and 2022. Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets: December 31, 2024 Gross Accumulated Foreign Currency Translation Adjustment Net (in thousands) Developed technology $ 267,706 $ ( 255,448 ) $ ( 5,820 ) $ 6,438 Customer relationships 52,109 ( 49,562 ) 204 2,751 Tradenames and trademarks 59,007 ( 50,805 ) ( 1,464 ) 6,738 Total intangible assets $ 378,822 $ ( 355,815 ) $ ( 7,080 ) $ 15,927 December 31, 2023 Gross Accumulated Foreign Currency Translation Adjustment Net (in thousands) 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 (1) In 2023 , $ 9.3 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization. Aggregate intangible assets amortization expense for the years ended December 31, 2024, 2023, and 2022, was $ 18.8 million, $ 19.0 million, and $ 19.3 million, respectively. Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2025 $ 11,125 2026 2,325 2027 1,108 2028 1,027 2029 342 Thereafter —

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	N. COMMITMENTS AND CONTINGENCIES Purchase Commitments As of December 31, 2024 , Teradyne had entered into non-cancelable purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $ 419.8 million, of which $ 409.6 million is for less than one year. Legal Claims Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business such as, but not limited to, patent, employment, commercial and environmental matters. Teradyne believes that it has meritorious defenses against all pending claims and intends to vigorously contest them. While it is not possible to predict or determine the outcomes of any pending claims or to provide possible ranges of losses that may arise, Teradyne believes the potential losses associated with all of these actions are unlikely to have a material adverse effect on its business, financial position or results of operations. On March 8, 2021, Industrial Automation LLC, sellers of AutoGuide, submitted a demand for arbitration against Teradyne and AutoGuide in Wilmington, Delaware alleging that Teradyne and AutoGuide breached certain provisions of the Membership Interests Purchase Agreement (the “Purchase Agreement”), dated as of October 18, 2019, among Industrial Automation LLC, Teradyne and AutoGuide. The arbitration demand sought full acceleration of the maximum earn-out amount payable under the Purchase Agreement, or $ 106.9 million, for the alleged breach of the earn-out provisions of the Purchase Agreement. On March 25, 2022, the arbitration claim was settled for $ 26.7 million. As a result, Teradyne has no remaining earn-out obligations. Guarantees and Indemnification Obligations Teradyne provides indemnification, to the extent permitted by law, to its officers, directors, employees and agents for liabilities arising from certain events or occurrences, while the officer, director, employee, or agent, is or was serving, at Teradyne’s request in such capacity. Teradyne may enter into indemnification agreements with certain of its officers and directors. With respect to acquisitions, Teradyne provides indemnifications to or assumes indemnification obligations for the current and former directors, officers and employees of the acquired companies in accordance with the acquired companies’ by-laws and charter. As a matter of practice, Teradyne has maintained directors’ and officers’ liability insurance coverage including coverage for directors and officers of acquired companies. Teradyne enters into agreements in the ordinary course of business with customers, resellers, distributors, integrators and suppliers. Most of these agreements require Teradyne to defend and/or indemnify the other party against intellectual property infringement claims brought by a third party with respect to Teradyne’s products. From time to time, Teradyne also indemnifies customers and business partners for damages, losses and liabilities they may suffer or incur relating to personal injury, personal property damage, product liability, breach of confidentiality obligations and environmental claims relating to the use of Teradyne’s products and services or resulting from the acts or omissions of Teradyne, its employees, authorized agents or subcontractors. On occasion, Teradyne has also provided guarantees to customers regarding the delivery and performance of its products in addition to the warranty described below. As a matter of ordinary course of business, Teradyne warrants that its products will substantially perform in accordance with its standard published specifications in effect at the time of delivery. Most warranties have a one-year duration commencing from installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based upon historical experience. When Teradyne receives revenue for extended warranties beyond the standard duration, the revenue is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. As of December 31, 2024 and 2023 , Teradyne had a product warranty accrual of $ 13.0 million and $ 15.7 million, respectively, included in other accrued liabilities, and revenue deferrals related to extended warranties of $ 41.6 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 December 31, 2024, and 2023 , except for product warranty, Teradyne has not recorded any liabilities for these guarantees and obligations because the amount would be immaterial.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Net Income per Common Share	O. NET INCOME PER COMMON SHARE The following table sets forth the computation of basic and diluted net income per common share: 2024 2023 2022 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 542,372 $ 448,752 $ 715,501 Weighted average common shares-basic 159,083 154,310 158,434 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 3,563 8,897 8,806 Restricted stock units 651 423 657 Stock options 11 34 52 Employee stock purchase rights 6 7 22 Incremental shares from assumed conversion of convertible notes (2) — 633 1,763 Dilutive potential common shares 4,231 9,994 11,300 Weighted average common shares-diluted 163,314 164,304 169,734 Net income per common share-basic $ 3.41 $ 2.91 $ 4.52 Net income per common share-diluted $ 3.32 $ 2.73 $ 4.22 (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 the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period. The computation of diluted net income per common share for 2024 and 2023 excludes the effect of the potential exercise of stock options to purchase approximately 0.1 million shares and restricted stock units to purchase approximately 0.1 million shares because the effect would have been anti-dilutive.

Restructuring and Other

Restructuring and Other	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring and Other	P. RESTRUCTURING AND OTHER During the year ended December 31, 2024 , Teradyne recorded $ 5.2 million of severance charges related to headcount reductions of 98 people primarily in Robotics and Semiconductor Test, which included charges related to a voluntary early retirement program for employees meeting certain condit ions, $ 3.6 million of acquisition and divestiture expenses, and $ 1.3 million of charges related to lease terminations. During the year ended December 31, 2023 , Teradyne recorded $ 14.7 million of severance charges related to headcount reductions of 215 people primarily in Semiconductor Test and Robotics, which included charges related to a voluntary early retirement program for employees meeting certain conditions, $ 3.1 million of acquisition and divestiture expenses related to Technoprobe transaction, a $ 1.5 million contract termination charge, and a charge of $ 1.1 million for an increase in environmental liabilities. During the year ended December 31, 2022 , Teradyne recorded a charge of $ 14.7 million related to the arbitration claim filed against Teradyne and AutoGuide related to an earn-out dispute, which was settled on March 25, 2022 for $ 26.7 million, $ 2.9 million of severance charges primarily in Robotics, and a charge of $ 2.7 million for an increase in environmental and legal liabilities, partially offset by a $ 3.4 million gain on sale of asset.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Retirement Plans	Q. 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 of 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 the plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of these plans consist primarily of fixed income and equity securities. In addition, Teradyne has an unfunded supplemental executive defined benefit plan in the United States to provide retirement benefits in excess of levels allowed by the Employment Retirement Income Security Act (“ERISA”) and the Internal Revenue Code (the “IRC”), as well as unfunded qualified foreign plans. In 2024 , Teradyne purchased a group annuity contract for its retiree participants in the U.S. qualified pension plan. Under the group annuity, the accrued pension obligation for 132 retiree participants were transferred to an insurance company. The reduction in the pension benefit obligation and pension assets was $ 23.4 million. During the year ended December 31, 2024 , Teradyne recorded settlement expense of $ 0.4 million related to the retiree group annuity transaction. In 2024 , Teradyne’s projected benefit obligations decreased primarily due to the $ 23.4 million purchase of a group annuity contract for its retiree participants in the U.S. qualified pension plan, actuarial gains of $ 8.0 million across all pension plans from increases in discount rates, and $ 2.0 million of gains from foreign exchange effects for foreign plans. In 2023 , Teradyne’s projected benefit obligations increased primarily due to actuarial losses of approximately $ 6.0 million across all pension plans from increases in discount rates, and approximately $ 1.0 million of losses from foreign exchange effects for foreign plans. The December 31 balances of these defined benefit pension plans assets and obligations are shown below: 2024 2023 United States Foreign United States Foreign (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 144,187 $ 33,984 $ 143,814 $ 29,935 Service cost 881 446 1,063 446 Interest cost 6,292 953 6,888 1,057 Actuarial (gain) loss ( 6,014 ) ( 1,972 ) 3,229 2,738 Benefits paid ( 11,658 ) ( 955 ) ( 10,807 ) ( 947 ) Retiree annuity purchase ( 23,386 ) — — — Liability (gain) loss due to settlement 394 ( 195 ) — ( 254 ) Non-U.S. currency movement — ( 1,988 ) — 1,009 End of year 110,696 30,273 144,187 33,984 Change in plan assets: Fair value of plan assets: Beginning of year 112,617 1,929 111,760 2,087 Actual return on plan assets 779 77 8,613 43 Company contributions 3,065 1,024 3,051 1,028 Benefits paid ( 11,658 ) ( 955 ) ( 10,807 ) ( 947 ) Retiree annuity purchase ( 23,386 ) — — — Settlements gain — ( 195 ) — ( 254 ) Non-U.S. currency movement — 108 — ( 28 ) End of year 81,417 1,988 112,617 1,929 Funded status $ ( 29,279 ) $ ( 28,285 ) $ ( 31,570 ) $ ( 32,055 ) The following table provides amounts recorded within the account line items of the statements of financial position as of December 31: 2024 2023 United States Foreign United States Foreign (in thousands) Retirement plans assets $ 11,994 $ — $ 11,504 $ — Accrued employees’ compensation and withholdings ( 3,263 ) ( 969 ) ( 3,110 ) ( 1,255 ) Retirement plans liabilities ( 38,010 ) ( 27,316 ) ( 39,964 ) ( 30,800 ) Funded status $ ( 29,279 ) $ ( 28,285 ) $ ( 31,570 ) $ ( 32,055 ) The accumulated benefit obligation for the United States defined benefit pension plans was $ 109.0 million and $ 142.2 million at December 31, 2024 and 2023, respectively. The accumulated benefit obligation for foreign defined benefit pension plans was $ 29.1 million and $ 32.6 million at December 31, 2024 and 2023, respectively. Information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31: 2024 2023 United States Foreign United States Foreign (in millions) Projected benefit obligation $ 41.3 $ 30.3 $ 43.1 $ 34.0 Accumulated benefit obligation 41.1 29.1 42.6 32.5 Fair value of plan assets — 2.0 — 1.9 Expense For the years ended December 31, 2024, 2023, and 2022, Teradyne’s net periodic pension cost (income) was comprised of the following: 2024 2023 2022 United Foreign United Foreign United Foreign (in thousands) Components of Net Periodic Pension Cost (Income): Service cost $ 881 $ 446 $ 1,063 $ 446 $ 1,588 $ 784 Interest cost 6,292 953 6,888 1,057 4,886 482 Expected return on plan assets ( 4,865 ) ( 77 ) ( 5,194 ) ( 45 ) ( 2,927 ) ( 75 ) Net actuarial (gain) loss ( 1,929 ) ( 1,948 ) 18 2,735 ( 11,170 ) ( 13,259 ) Settlement (gain) loss 394 ( 24 ) ( 209 ) 5 — — Total net periodic pension cost (income) $ 773 $ ( 650 ) $ 2,566 $ 4,198 $ ( 7,623 ) $ ( 12,068 ) Weighted Average Assumptions to Determine Net Periodic Pension Cost at January 1: 2024 2023 2022 United Foreign United Foreign United Foreign Discount rate 4.7 % 3.0 % 3.5 % 3.5 % 2.5 % 1.1 % Expected return on plan assets 4.7 2.5 4.8 1.8 2.0 4.0 Salary progression rate 2.5 2.4 2.4 2.1 2.4 2.2 Weighted Average Assumptions to Determine Pension Obligations at December 31: 2024 2023 United States Foreign United States Foreign Discount rate 5.4 % 3.3 % 4.7 % 3.0 % Salary progression rate 2.5 2.4 2.5 2.4 In developing the expected return on plan assets assumption, Teradyne evaluates input from its investment manager and pension consultants, including their forecast of asset class return expectations. Teradyne believes that 4.8 % was an appropriate rate to use for fiscal year 2024 for the U.S. Qualified Pension Plan (“U.S. Plan”). Teradyne recognizes net actuarial gains and losses and the change in the fair value of the plan assets in its operating results in the year in which they occur or upon any interim remeasurement of the plans. Teradyne calculates the expected return on plan assets using the fair value of the plan assets. Actuarial gains and losses are generally measured annually as of December 31 and, accordingly, recorded during the fourth quarter of each year or upon any interim remeasurement of the plans. The discount rate utilized to determine future pension obligations for the U.S. Plan is based on FTSE Pension Index adjusted for the plan’s expected cash flows and was 5.4 % at December 31, 2024, up from 4.7 % at December 31, 2023. Plan Assets As of December 31, 2024 , the fair value of Teradyne’s pension plans’ assets totaled $ 83.4 million, of which $ 81.4 million was related to the U.S. Plan and $ 2.0 million was related to the Taiwan defined benefit pension plan. Substantially all of Teradyne’s pension plans’ assets are held in individual trusts, which were established for the investment of assets of Teradyne’s sponsored retirement plans. The following table provides weighted average pension asset allocation by asset category at December 31, 2024 and 2023: 2024 2023 United States Foreign United States Foreign Fixed income securities 94.0 % — % 94.0 % — % Equity securities 5.0 — 5.0 — Other 1.0 100.0 1.0 100.0 100.0 % 100.0 % 100.0 % 100.0 % The assets of the U.S. Plan are overseen by the Teradyne Fiduciary Committee which is comprised of members of senior management drawn from appropriate diversified levels of the management team. The Fiduciary Committee is responsible for setting the policy that provides the framework for management of the U.S. Plan assets. In accordance with its responsibilities, the Fiduciary Committee meets on a regular basis to review the performance of the U.S. Plan assets and compliance with the investment policy. The policy sets forth an investment structure for managing U.S. Plan assets, including setting the asset allocation ranges, which are expected to provide an appropriate level of overall diversification required to maximize the long-term return on plan assets for a prudent and reasonable level of risk given prevailing market conditions, total investment return over the long term, and preservation of capital, while maintaining sufficient liquidity to pay the benefits of the U.S. Plan. The investment portfolio will not, at any time, have a direct investment in Teradyne stock. It may have indirect investment in Teradyne stock, if one of the funds selected by the investment manager invests in Teradyne stock. In developing the asset allocation ranges, third party asset allocation studies are periodically performed that consider the current and expected positions of the plan assets and funded status. Based on this study and other appropriate information, the Fiduciary Committee establishes asset allocation ranges taking into account acceptable risk targets and associated returns. The investment return objectives are to avoid excessive volatility and produce a rate of return that at least matches the Policy Index identified below. The manager’s investment performance is reviewed at least annually. Results for the total portfolio and for each major category of assets are evaluated in comparison with appropriate market indices and the Policy Index. The target asset allocation and the index for each asset category for the U.S. Plan, per the investment policy, are as follows: Asset Category: Policy Index: Target U.S. corporate fixed income Bloomberg U.S. Corporate A or Better Index, 20+ Year Index 66 % U.S. corporate fixed income Bloomberg U.S. Intermediate Corporate ex Baa Index 9 U.S. government fixed income Bloomberg U.S. 3 - 10 year Treasury Bond Index 12 U.S. government fixed income Bloomberg U.S. Government Bond Index 2 Global equity MSCI World Index 5 High yield fixed income ICE BofA BB-B U.S. High Yield Constrained Index 5 Cash ICE BofA 3 -Month Treasury Bill Index 1 Teradyne’s U.S. Plan invests primarily in common trust funds. Units held in the common trust funds are valued at the unit price as reported by the investment manager based on the asset value of the underlying investments; underlying investments in equity securities are valued at the last reported sales price, and underlying investments in fixed-income securities are generally valued using methods based upon market transactions for comparable securities. During the years ended December 31, 2024 and December 31, 2023, there were no transfers of pension assets in or out of Level 1, Level 2, and Level 3. The fair value of pension plan assets by asset category and by level at December 31, 2024 and December 31, 2023 were as follows: December 31, 2024 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 65,160 $ — $ 65,160 $ — $ — $ — $ — U.S. government securities — 11,414 — 11,414 — — — — Global equity — 4,025 — 4,025 — — — — Other — — — — — 1,988 — 1,988 Cash and cash equivalents 818 — — 818 — — — — Total $ 818 $ 80,599 $ — $ 81,417 $ — $ 1,988 $ — $ 1,988 December 31, 2023 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 89,971 $ — $ 89,971 $ — $ — $ — $ — U.S. government securities — 15,817 — 15,817 — — — — Global equity — 5,691 — 5,691 — — — — Other — — — — — 1,929 — 1,929 Cash and cash equivalents 1,138 — — 1,138 — — — — Total $ 1,138 $ 111,479 $ — $ 112,617 $ — $ 1,929 $ — $ 1,929 Contributions Teradyne’s funding policy is to make contributions to the plans in accordance with local laws and to the extent that such contributions are tax deductible. During 2024, Teradyne contributed $ 3.1 million to the U.S. supplemental executive defined benefit pension plan and $ 1.0 million to certain qualified plans for non-U.S. subsidiaries. During 2023, Teradyne contributed $ 3.1 million to the U.S. supplemental executive defined benefit pension plan and $ 1.0 million to certain qualified plans for non-U.S. subsidiaries. In 2025, contributions to the U.S. supplemental executive defined benefit pension plan and certain qualified plans from non-U.S. subsidiaries will be approximately $ 3.3 million and $ 1.1 million, respectively. Contributions to the U.S. supplemental executive defined benefit pension plan and certain non-U.S. subsidiaries qualified plans will be approximately $ 7.4 million and $ 2.4 million, respectively, in 1 to 3 years, $ 7.4 million and $ 2.5 million, respectively, in 3 to 5 years and $ 16.8 million and $ 7.8 million, respectively, thereafter. Expected Future Pension Benefit Payments Future benefit payments are expected to be paid as follows: United States Foreign (in thousands) 2025 $ 9,202 $ 1,077 2026 8,152 1,208 2027 9,043 1,245 2028 9,135 1,253 2029 9,040 1,422 2030-2034 42,009 8,561 Postretirement Benefit Plans In addition to receiving pension benefits, U.S. Teradyne employees who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees’ survivors and are available to all retirees. Substantially all of Teradyne’s current U.S. employees could become eligible for these benefits, and the existing benefit obligation relates primarily to those employees. During the twelve months ended December 31, 2024, Teradyne recorded special termination benefit charges associated with a voluntary early retirement program. The December 31 balances of the postretirement assets and obligations are shown below: 2024 2023 (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 6,933 $ 5,345 Service cost 37 34 Interest cost 289 299 Actuarial (gain) loss ( 445 ) 155 Benefits paid ( 1,685 ) ( 1,413 ) Special termination benefits 462 2,513 End of year 5,591 6,933 Change in plan assets: Fair value of plan assets: Beginning of year — — Company contributions 1,685 1,413 Benefits paid ( 1,685 ) ( 1,413 ) End of year — — Funded status $ ( 5,591 ) $ ( 6,933 ) The following table provides amounts recorded within the account line items of financial position as of December 31: 2024 2023 (in thousands) Accrued employees’ compensation and withholdings $ ( 938 ) $ ( 1,508 ) Retirement plans liabilities ( 4,653 ) ( 5,425 ) Funded status $ ( 5,591 ) $ ( 6,933 ) The following table provides amounts recognized in accumulated other comprehensive income (loss) as of December 31: 2024 2023 (in thousands) Prior service credit, before tax $ ( 14 ) $ ( 23 ) Deferred taxes ( 1,693 ) ( 1,691 ) Total recognized in other comprehensive income (loss), net of tax $ ( 1,707 ) $ ( 1,714 ) Expense For the years ended December 31, 2024, 2023, and 2022, Teradyne’s net periodic postretirement benefit cost (income) was comprised of the following: 2024 2023 2022 (in thousands) Components of Net Periodic Postretirement Benefit Cost (income): Service cost $ 37 $ 34 $ 64 Interest cost 289 299 177 Amortization of prior service credit ( 9 ) ( 9 ) ( 9 ) Net actuarial (gain) loss ( 445 ) 155 ( 1,155 ) Special termination benefits 462 2,513 — Total net periodic postretirement benefit cost (income) 334 2,992 ( 923 ) Changes in Plan Assets and Benefit Obligations Recognized in Other Reversal of amortization items: Prior service credit 9 9 9 Total recognized in other comprehensive income 9 9 9 Total recognized in net periodic postretirement cost (income) and other $ 343 $ 3,001 $ ( 914 ) Weighted Average Assumptions to Determine Net Periodic Postretirement Benefit Income as of January 1: 2024 2023 2022 Discount rate 4.7 % 5.0 % 2.6 % Initial health care cost trend rate 7.7 7.2 7.3 Ultimate health care cost trend rate 4.5 4.5 4.5 Year in which ultimate health care cost trend rate is reached 2033 2032 2029 Weighted Average Assumptions to Determine Postretirement Benefit Obligation as of December 31: 2024 2023 2022 Discount rate 5.4 % 4.7 % 5.0 % Initial health care trend 8.6 7.7 7.2 Ultimate health care trend 4.5 4.5 4.5 Medical cost trend rate decrease to ultimate rate in year 2035 2033 2032 Contributions Contributions to the U.S. postretirement benefit plan will be approximately $ 0.9 million in 2025, $ 1.3 million in 1 to 3 years, $ 0.9 million in 3 to 5 years and $ 1.7 million, thereafter. Expected Future Benefit Payments Future benefit payments are expected to be paid as follows: Benefit Payments (in thousands) 2025 $ 938 2026 671 2027 585 2028 510 2029 414 2030-2034 1,719

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	R. STOCK-BASED COMPENSATION Stock Compensation Plans 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 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) death or (2) after attaining both at least age sixty and at least ten years of service, retirement or termination other than for cause, 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 2024, 2023 and 2022, Teradyne granted 0.6 million, 0.5 million and 0.4 million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $ 96.72 , $ 102.45 , and $ 109.42 , respectively. During 2024, 2023 and 2022, Teradyne granted 0.1 million of service-based restricted stock unit awards to non-employee directors at a weighted average grant date fair value of $ 121.29 , $ 90.50 , and $ 105.93 , respectively. During 2024, 2023 and 2022 , Teradyne granted 0.1 million of PBIT PRSUs with a grant date fair value of $ 94.51 , $ 102.91 and $ 110.84 , respectively. During 2024, 2023 and 2022, Teradyne granted 0.1 million TSR PRSUs, with a grant date fair value of $ 102.51 , $ 139.04 , and $ 101.06 , respectively. The fair value was estimated using the Monte Carlo simulation model with the following assumptions: 2024 2023 2022 Risk-free interest rate 3.9 % 4.0 % 1.4 % Teradyne volatility-historical 42.4 % 49.7 % 47.1 % NYSE Composite Index volatility-historical 15.6 % 24.1 % 22.7 % Dividend yield 0.5 % 0.4 % 0.4 % Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index for each of the 2024, 2023 and 2022 grants over the most recent three-year period. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of each of the grants. Dividend yield was based upon an estimated annual dividend amount of $ 0.48 per share for 2024, $ 0.44 per share for 2023 , and $ 0.44 per share for 2022 , divided by Teradyne’s stock price on the grant date of $ 95.83 for the 2024 grants, $ 104.12 for the 2023 grants, and $ 112.12 for the 2022 grants. During 2024, 2023 and 2022 , Teradyne granted 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $ 37.50 , $ 41.23 , and $ 39.01 , respectively. The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions: 2024 2023 2022 Expected life (years) 4.0 4.0 4.0 Risk-free interest rate 4.0 % 3.8 % 1.6 % Volatility-historical 46.3 % 46.6 % 43.7 % Dividend yield 0.5 % 0.4 % 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 on the grant date of $ 95.14 for the 2024 grant, and $ 0.44 per share divided by Teradyne's stock price on the grant date of $ 104.15 for the 2023 grant, and $ 0.44 per share divided by Teradyne’s stock price on the grant date of $ 112.12 for the 2022 grants. Stock compensation plan activity for the years 2024, 2023 and 2022, is as follows: 2024 2023 2022 (in thousands) Restricted Stock Units: Non-vested at January 1 1,378 1,317 1,417 Awarded 703 728 660 Vested ( 492 ) ( 609 ) ( 709 ) Forfeited ( 62 ) ( 58 ) ( 51 ) Non-vested at December 31 1,527 1,378 1,317 Stock Options: Outstanding at January 1 171 188 171 Granted 49 41 42 Exercised ( 77 ) ( 56 ) ( 25 ) Forfeited ( 2 ) ( 2 ) — Expired — — — Outstanding at December 31 141 171 188 Vested and expected to vest at December 31 141 171 188 Exercisable at December 31 34 68 69 Total shares available for the years 2024, 2023 and 2022: 2024 2023 2022 (in thousands) Shares available: Available for grant at January 1 4,353 5,062 5,713 Options granted ( 49 ) ( 41 ) ( 42 ) Options forfeited 2 2 — Restricted stock units awarded ( 703 ) ( 728 ) ( 660 ) Restricted stock units forfeited 62 58 51 Available for grant at December 31 3,665 4,353 5,062 Weighted average restricted stock unit award date fair value information for the years 2024, 2023 and 2022, is as follows: 2024 2023 2022 Non-vested at January 1 $ 101.00 $ 88.71 $ 67.97 Awarded 97.06 105.05 108.74 Vested 93.12 75.55 54.27 Forfeited 103.81 102.12 85.71 Non-vested at December 31 $ 101.17 $ 101.00 $ 88.71 Restricted stock unit awards aggregate intrinsic value information at December 31 for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 (in thousands) Vested $ 54,235 $ 62,001 $ 95,408 Outstanding 192,324 149,504 115,087 Expected to vest 177,878 135,238 108,666 Restricted stock units weighted average remaining contractual terms (in years) information at December 31 for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 Outstanding 1.19 1.13 0.99 Expected to vest 1.19 1.13 0.99 Weighted average stock options exercise price information for the year ended December 31, 2024 is as follows: 2024 Outstanding at January 1 $ 94.85 Options granted 95.14 Options exercised 86.02 Options forfeited 112.58 Options cancelled 112.80 Outstanding at December 31 99.51 Exercisable at December 31 91.27 The total cash received from employees as a result of employee stock options exercised during the years ended December 31, 2024, 2023 and 2022 , was $ 6.6 million, $ 2.2 million, and $ 0.9 million, respectively. In connection with these exercises, the tax benefit realized by Teradyne for the years ended December 31, 2024, 2023 and 2022, was $ 0.2 million, $ 0.2 million, and $ 0.1 million, respectively. Stock option aggregate intrinsic value information for the years ended December 31, 2024, 2023 and 2022 is as follows: 2024 2023 2022 (in thousands) Exercised $ 2,783 $ 3,901 $ 2,030 Outstanding 3,709 2,647 3,963 Expected to vest 2,531 696 1,583 Vested and exercisable 1,178 1,950 2,380 Stock options weighted average remaining contractual terms (in years) information at December 31, for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 Outstanding 4.8 4.4 4.2 Expected to vest 5.2 5.1 4.8 Vested and exercisable 3.3 3.4 3.1 As of December 31, 2024 , total unrecognized expense related to non-vested restricted stock unit awards and stock options was $ 82.6 million and is expected to be recognized over a weighted average period of 2.5 years. Employee Stock Purchase Plan Under the ESPP, eligible employees may purchase shares of common stock through regular payroll deductions of up to 10 % of their compensation, to a maximum of shares with a fair market value of $ 25,000 per calendar year, not to exceed 6,000 shares. Under the plan, the price paid for the common stock is equal to 85 % of the stock price on the last business day of the six-month purchase period. In July 2024 , 0.1 million shares of common stock were issued to employees who participated in the plan during the first half of 2024 at the price of $ 126.05 per share. In January 2025, Teradyne issued 0.1 million shares of common stock to employees who participated in the plan during the second half of 2024 at the price of $ 107.04 per share. In July 2023 , 0.2 million shares of common stock were issued to employees who participated in the plan during the first half of 2023 at the price of $ 94.64 per share. In January 2024 , Teradyne issued 0.2 million shares of common stock to employees who participated in the plan during the second half of 2023 at the price of $ 92.25 per share. In July 2022, 0.2 million shares of common stock were issued to employees who participated in the plan during the first half of 2022 at the price of $ 76.12 per share. In January 2023 , Teradyne issued 0.2 million shares of common stock to employees who participated in the plan during the second half of 2022 at the price of $ 74.25 per share. As of December 31, 2024 , there were 3.2 million shares available for grant under the ESPP. The following table provides the effect to income from operations for recording stock-based compensation for the years ended December 31, 2024, 2023, and 2022: 2024 2023 2022 (in thousands) Cost of revenues $ 4,922 $ 4,208 $ 4,050 Engineering and development 12,531 10,659 9,992 Selling and administrative 42,669 42,815 34,186 Stock-based compensation 60,122 57,682 48,228 Income tax benefit ( 10,472 ) ( 10,397 ) ( 11,493 ) Total stock-based compensation expense after income taxes $ 49,650 $ 47,285 $ 36,735

Savings Plan

Savings Plan	12 Months Ended
	Dec. 31, 2024
Defined Contribution Plan [Abstract]
Savings Plan	S. SAVINGS PLAN Teradyne sponsors a defined contribution employee retirement savings plan (“Savings Plan”) covering substantially all U.S. employees. Under the Savings Plan, employees may contribute up to 20 % of their compensation (subject to Internal Revenue Service limitations). The Savings Plan provides for a discretionary employer match that is determined each year. In 2024, 2023 and 2022 , Teradyne matched 100 % of eligible employee contributions up to 4 % of their compensation for employees not accruing benefits in the U.S. Qualified Pension Plan. There was no match for employees still actively accruing benefits in the U.S. Qualified Pension Plan. Teradyne’s contributions vest 25 % per year for the first four years of employment, and contributions for those employees with four years of service vest immediately. In addition, Teradyne sponsors an unfunded U.S. Supplemental Savings Plan to provide savings benefits in excess of those allowed by the Employee Retirement Income Security Act of 1974 and the Internal Revenue Code. The provisions of this plan are the same as the Savings Plan. The liability for the U.S. Supplemental Savings Plan at December 31, 2024 and 2023 , was $ 63.4 million and $ 55.9 million, respectively, and is included in retirement plan liabilities. Teradyne contributes to defined contributions savings plans for its foreign employees. Under Teradyne’s savings plans, amounts charged to the statements of operations for the years ended December 31, 2024, 2023, and 2022 were $ 29.7 million, $ 30.5 million, and $ 30.1 million, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	T. INCOME TAXES The components of income before income taxes and the provision (benefit) for income taxes as shown in the consolidated statements of operations were as follows: 2024 2023 2022 (in thousands) Income before income taxes: U.S. $ 231,346 $ 307,997 $ 385,968 Non-U.S. 377,740 217,575 454,417 $ 609,086 $ 525,572 $ 840,385 Provision (benefit) for income taxes: Current: U.S. Federal $ 40,296 $ 58,063 $ 86,692 Non-U.S. 62,851 54,037 74,204 State 2,716 2,362 2,681 105,863 114,462 163,577 Deferred: U.S. Federal ( 33,195 ) ( 27,459 ) ( 36,739 ) Non-U.S. ( 9,003 ) ( 8,584 ) 1,232 State ( 4,162 ) ( 1,599 ) ( 3,186 ) ( 46,360 ) ( 37,642 ) ( 38,693 ) Total provision for income taxes: $ 59,503 $ 76,820 $ 124,884 Income tax expense for 2024, 2023 and 2022 totaled $ 59.5 million, $ 76.8 million, and $ 124.9 million, respectively. The effective tax rate for 2024, 2023 and 2022 was 9.8 %, 14.6 % and 14.9 %, respectively. At December 31, 2024 , Teradyne’s remaining tax liability resulting from the U.S. one-time transition tax on the mandatory deemed repatriation of foreign earnings amounts to $ 44.3 million. Teradyne will pay approximately $ 19.7 million related to the transition tax in 2025, and $ 24.6 million in one to three years. Teradyne has made an accounting policy election to account for global intangible low-taxed income (“GILTI”) as a component of tax expense in the period in which Teradyne is subject to the rules and therefore did not provide any deferred tax impacts of GILTI in its consolidated financial statements. The decrease in the effective tax rate from 2023 to 2024 is primarily attributable to a shift in the geographic distribution of income which resulted in a reduction in income in higher tax rate foreign jurisdictions, the benefit of the release of reserves for uncertain tax positions as a result of the expiration of statute and a decrease in non-deductible officer’s compensation. These rate benefits were partially offset by reductions in benefits from foreign tax credits, U.S. research and development credits and the U.S. foreign derived intangible income deduction. The decrease in the effective tax rate from 2022 to 2023 is primarily attributable to benefit from tax credits and the U.S. foreign derived intangible income deduction. These decreases in expense were partially offset by a shift in the geographic distribution of income, which increased the income subject to taxation in higher tax rate jurisdictions relative to lower tax rate jurisdictions and a reduction in benefit from equity compensation. A reconciliation of the effective tax rate for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 U.S. statutory federal tax rate 21.0 % 21.0 % 21.0 % U.S. global intangible low-taxed income 1.2 0.8 1.2 Non-deductible officers’ compensation 0.3 1.1 1.3 Equity compensation — ( 0.4 ) ( 1.1 ) U.S. foreign derived intangible income ( 3.1 ) ( 3.9 ) ( 3.1 ) U.S. research and development credit ( 3.0 ) ( 4.2 ) ( 1.8 ) Foreign taxes ( 2.7 ) 2.5 ( 1.9 ) Uncertain tax positions ( 1.9 ) 0.7 0.1 Foreign tax credits ( 1.3 ) ( 3.3 ) ( 1.0 ) State income taxes, net of federal tax benefit ( 0.1 ) 0.1 ( 0.1 ) Other, net ( 0.6 ) 0.2 0.3 9.8 % 14.6 % 14.9 % Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings attributable to the Singapore tax holiday for the years ended December 31, 2024, 2023 and 2022 were $ 17.1 million or $ 0.10 per diluted share, $ 1.4 million or $ 0.01 per diluted share, and $ 16.0 million or $ 0.09 per diluted share, respectively. In November 2020, Teradyne entered into an agreement with the Singapore Economic Development Board which extended our Singapore tax holiday under substantially similar terms to the agreement which expired on December 31, 2020. The new tax holiday is scheduled to expire on December 31, 2025 . Significant components of Teradyne’s deferred tax assets (liabilities) as of December 31, 2024 and 2023 were as follows: 2024 2023 (in thousands) Deferred tax assets: Tax credits $ 121,635 $ 112,571 Research and development 116,746 82,571 Pension liabilities 25,202 24,997 Accruals 23,946 25,644 Inventory valuations 18,688 19,289 Lease liability 17,828 21,167 Net operating loss carryforwards 16,894 5,737 Deferred revenue 14,562 13,807 Equity compensation 8,901 7,179 Vacation accrual 6,847 6,096 Intangible assets 4,720 2,323 Investment impairment 3,328 3,292 Marketable securities — 128 Other 322 953 Gross deferred tax assets 379,619 325,754 Less: valuation allowance ( 117,254 ) ( 109,251 ) Total deferred tax assets $ 262,365 $ 216,503 Deferred tax liabilities: Depreciation $ ( 18,788 ) $ ( 16,681 ) Right of use assets ( 16,257 ) ( 19,016 ) Contingent consideration ( 5,270 ) ( 5,214 ) Marketable securities ( 650 ) — Total deferred tax liabilities $ ( 40,965 ) $ ( 40,911 ) Net deferred assets $ 221,400 $ 175,592 As of December 31, 2024 and 2023, Teradyne evaluated the likelihood that it would realize deferred income taxes to offset future taxable income and concluded that it is more likely than not that the majority of its deferred tax assets will be realized through consideration of both the positive and negative evidence. At December 31, 2024 and 2023 , Teradyne maintained a valuation allowance for certain deferred tax assets of $ 117.3 million and $ 109.3 million, respectively, primarily related to state net operating losses and state tax credit carryforwards, due to the uncertainty regarding their realization. Adjustments could be required in the future if Teradyne estimates that the amount of deferred tax assets to be realized is more or less than the net amount recorded. At December 31, 2024, Teradyne had tax effected operating loss carryforwards that expire in the following years: State Foreign (in thousands) 2025 $ 4 $ — 2026 — — 2027 — — 2028 10 80 2029 49 465 2030-2034 62 34 2035-2039 37 — Beyond 2039 19 — Non-expiring 54 16,079 Total $ 235 $ 16,658 Teradyne has approximately $ 158.2 million of tax credit carryforwards including federal business tax credits of approximately $ 4.3 million which expire in 2028 through 2034, and state tax credits of $ 153.9 million, of which $ 81.5 million do not expire and the remainder expire in the years 2025 through 2043 . Teradyne’s gross unrecognized tax benefits for the years ended December 31, 2024, 2023 and 2022 were as follows: 2024 2023 2022 (in thousands) Beginning balance as of January 1 $ 18,606 $ 15,608 $ 14,465 Additions: Tax positions for current year — 1,398 Tax positions for prior years 3,024 13 Reductions: Tax positions for prior years ( 2,696 ) ( 26 ) ( 56 ) Expiration of statutes ( 8,247 ) — ( 212 ) Ending balance as of December 31 $ 7,663 $ 18,606 $ 15,608 Current year reductions primarily relate to foreign transfer pricing and research credits. Of the $ 7.7 million of unrecognized tax benefits as of December 31, 2024 , $ 2.3 million would impact the consolidated income tax rate if ultimately recognized. The remaining $ 5.4 million would impact deferred taxes if recognized. As of December 31, 2024 , Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $ 0.7 million in the next twelve months as a result of a lapse of statutes of limitation. The estimated decrease relates to federal research credits. Teradyne records all interest and penalties related to income taxes as a component of income tax expense. Accrued interest and penalties related to income tax items at December 31, 2024 and 2023 amounted to $ 0.3 million and $ 1.3 million, respectively. For the years ended December 31, 2024, 2023 and 2022 , benefit of $ 1.0 million, expense of $ 0.9 million, and expense of $ 0.1 million, respectively, was recorded for interest and penalties related to income tax items. Teradyne is subject to U.S. federal income tax, as well as income tax in multiple state, local and foreign jurisdictions. As of December 31, 2024, all material state and local income tax matters have been concluded through 2019, all material federal income tax matters have been concluded through 2020 and all material foreign income tax matters have been concluded through 2017. However, in some jurisdictions, including the United States, operating losses and tax credits may be subject to adjustment until such time as they are utilized and the year of utilization is closed to adjustment. As of December 31, 2024, Teradyne is not permanently reinvested with respect to the unremitted earnings of non-U.S. subsidiaries to the extent that those earnings exceed local statutory and operational requirements. Remittance of those earnings is not expected to result in material income tax. 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. The Organization for Economic Cooperation and Development (the “OECD”) has introduced a framework to implement a global minimum tax of 15 % for certain multinational companies, referred to as Pillar Two. While it is uncertain whether the United States will enact legislation to adopt Pillar Two, certain countries in which Teradyne operates have enacted Pillar Two legislation, and other countries are in the process of introducing draft Pillar Two legislation. Teradyne is closely monitoring these developments and evaluating the potential future impact on our effective tax rate. As of December 31, 2024, the effective tax rate impact from Pillar Two was not material to our consolidated financial statements.

Segment, Geographic and Signifi

Segment, Geographic and Significant Customer Information	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment, Geographic and Significant Customer Information	U. SEGMENT, GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION Teradyne historically has had four reportable segments (Semiconductor Test, System Test, Wireless Test and Robotics). Each of the reportable segments represented an individual operating segment. In the fourth quarter of 2024, Teradyne observed a shift in forecasted revenue generating activities within Integrated System Test, a historical component of System Test, to activities that more closely align with the Semiconductor Test segment. In response, beginning in the fourth quarter of 2024, Teradyne made changes to the operational structure of the business to better align the components within the operating segments based on the chief operating decision maker’s ("CODM") conclusion that it would be more appropriate to include Integrated System Test results within Semiconductor Test results. This was a primary consideration for including Integrated System Test within Semiconductor Test and will allow for better informed decisions related to evaluating segment performance. This change does not result in a change in the identified operating segments. However, the System Test segment no longer meets the requirements for individual disclosure. Wireless Test also does not meet the requirements for individual disclosure. As such, System Test and Wireless Test will be included within the “All other” segments category. As of December 31, 2024, Teradyne has two reportable segments (Semiconductor Test and Robotics). Each of the reportable segments continues to represent an individual operating segment. The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services inclusive of storage and system level test products. The Robotics segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms and autonomous mobile robots. Each reportable segment has a segment manager who is accountable to and maintains regular contact with Teradyne’s CODM (Teradyne’s chief executive officer ) to discuss operating activities, financial results, forecasts, and plans for the segment. The CODM uses business segment income (loss) before income taxes predominantly in the annual budgeting and forecasting process. The CODM also uses this measure when making decisions about the allocation of operating and capital resources to each segment. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies.” Segment information for the years ended December 31, 2024, 2023 and 2022 is as follows: Semiconductor Robotics Reportable Segments All Other Corporate Consolidated (in thousands) 2024 Revenues $ 2,123,920 $ 364,848 $ 2,488,768 $ 331,112 $ — $ 2,819,880 Less: Cost of revenues 866,353 155,080 1,021,433 120,400 — 1,141,833 Engineering and development 295,614 67,306 362,920 46,556 — 409,476 Selling and marketing 187,384 113,327 300,711 50,317 — 351,028 General and administrative 89,952 54,328 144,280 21,282 — 165,562 Other segment items (1)(2) 126,449 52,359 178,808 26,833 ( 62,746 ) 142,895 Income (loss) before taxes (2) 558,168 ( 77,552 ) 480,616 65,724 62,746 609,086 Total assets (3) 1,287,219 742,017 2,029,236 213,749 1,465,730 3,708,714 Property additions 168,130 22,275 190,405 7,690 — 198,095 Depreciation and amortization expense 85,737 27,668 113,405 6,336 — 119,741 2023 Revenues $ 1,957,188 $ 375,183 $ 2,332,371 $ 343,927 $ — $ 2,676,298 Less: Cost of revenues 846,570 151,833 998,403 118,040 — 1,116,443 Engineering and development 257,387 68,668 326,055 44,538 — 370,593 Selling and marketing 162,068 107,157 269,225 50,131 — 319,356 General and administrative 77,786 56,483 134,269 25,104 — 159,373 Other segment items (1)(2) 114,873 45,294 160,167 26,657 ( 1,863 ) 184,961 Income (loss) before taxes (2) 498,504 ( 54,252 ) 444,252 79,457 1,863 525,572 Total assets (3) 1,388,842 737,323 2,126,165 191,055 1,169,605 3,486,824 Property additions 113,664 40,739 154,403 5,239 — 159,642 Depreciation and amortization expense 78,568 25,527 104,095 7,021 ( 230 ) 110,886 2022 Revenues $ 2,350,603 $ 403,138 $ 2,753,741 $ 401,053 $ 251 $ 3,155,045 Less: Cost of revenues 970,972 161,383 1,132,355 125,522 — 1,257,877 Engineering and development 272,296 64,670 336,966 44,111 — 381,077 Selling and marketing 156,520 101,584 258,104 51,888 — 309,992 General and administrative 75,544 57,845 133,389 20,785 — 154,174 Other segment items (1)(2) 131,464 33,785 165,249 34,587 11,704 211,540 Income (loss) before taxes (2) 743,807 ( 16,129 ) 727,678 124,160 ( 11,453 ) 840,385 Total assets (3) 1,435,766 665,638 2,101,403 207,079 1,192,769 3,501,252 Property additions 126,899 25,711 152,610 10,639 — 163,249 Depreciation and amortization expense 76,922 25,339 102,261 7,836 578 110,675 (1) For each reportable segment, the other segment items category includes equity and variable compensation, acquired intangible assets amortization, and restructuring and other charges. (2) Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, acquired intangible amortization, gain on the sale of a business, pension and postretirement plan actuarial gains (losses), legal and environmental fees, contingent consideration adjustments, acquisition and divestiture related expenses, contract termination settlement charge, and an expense for the modification of Teradyne's former chief executive officer's outstanding equity awards. (3) Total assets are attributable to each segment. In 2023, Semiconductor Test includes $ 34.8 million of total assets classified as assets held for sale. See Note E: "Dispositions" for additional information. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets. Information as to Teradyne’s revenues by country is as follows: 2024 2023 2022 (in thousands) Revenues from customers (1): Korea $ 695,669 $ 394,690 $ 544,816 Taiwan 601,997 384,842 626,424 China 375,186 314,899 491,798 United States 374,333 433,661 469,948 Europe 251,285 273,784 268,384 Japan 159,827 281,742 162,920 Singapore 90,113 116,969 99,503 Malaysia 62,376 89,197 142,203 Philippines 53,636 189,419 124,107 Thailand 49,268 91,818 137,356 Rest of the World 106,190 105,277 87,586 $ 2,819,880 $ 2,676,298 $ 3,155,045 (1) Revenues attributable to a country are based on location of customer site. In 2024, revenues from Samsung, a customer of our Semiconductor Test segment, accounted for 12.5 % of our consolidated revenues. In 2023, revenues from Texas Instruments Inc., a customer of our Semiconductor Test segment, accounted for 10 % of our consolidated revenues. Teradyne estimates consolidated revenues driven by Qualcomm, a customer of our Semiconductor Test, System Test, and Wireless Test segments, combining direct and indirect sales, accounted for approximately 11 % of its consolidated revenues in 2022. Long-lived assets by geographic area: United Foreign (1) Total (in thousands) December 31, 2024 $ 328,733 $ 249,623 $ 578,356 December 31, 2023 (2) $ 322,445 $ 207,995 $ 530,440 (1) As of December 31, 2024 and December 31, 2023, long-lived assets attributable to Denmark were $ 85.1 million and $ 78.1 million, respectively. Long-lived assets attributable to Singapore were $ 74.8 million as of December 31, 2024 . (2) Includes $ 11.5 million of long-lived assets classified as assets held for sale. See Note E: "Dispositions" for additional information.

Stock Repurchase Program

Stock Repurchase Program	12 Months Ended
	Dec. 31, 2024
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program	V. STOCK REPURCHASE PROGRAM In January 2023, Teradyne’s Board of Directors cancelled the January 2021 repurchase program and approved a new repurchase program for up to $ 2.0 billion of common stock. In 2024, Teradyne repurchased 1.7 million shares of common stock for a total cost of $ 199.4 million, exclusive of tax, at an average price of $ 114.63 per share. In 2023, Teradyne repurchased 3.9 million shares of common stock for $ 400.5 million at an average price of $ 102.47 per share. The cumulative repurchases under the January 2023 repurchase program as of December 31, 2024 were 5.6 million shares of common stock for $ 599.9 million at an average price per share of $ 106.21 . The total cost of shares acquired includes commissions and related excise tax and is recorded as a reduction to retained earnings.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	W. SUBSEQUENT EVENTS In January 2025, Teradyne’s Board of Directors declared a quarterly cash dividend of $ 0.12 per share to be paid on March 14, 2025 to shareholders of record as of February 14, 2025 . While Teradyne declared a quarterly cash dividend and authorized a share repurchase program, it may reduce or eliminate the cash dividend or share repurchase program in the future. Future cash dividends and stock repurchases are subject to the discretion of Teradyne’s Board of Directors which will consider, among other things, Teradyne’s earnings, capital requirements and financial condition.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	TERADYNE, INC. SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS Column A Column B Column C Column D Column E Column F Description Balance at Additions Other Deductions Balance at (in thousands) Valuation reserve deducted in the balance sheet Accounts receivable: 2024 Allowance for credit losses $ 1,988 $ 149 $ ( 36 ) $ ( 10 ) $ 2,111 2023 Allowance for credit losses $ 1,955 $ 301 $ 23 $ 291 $ 1,988 2022 Allowance for credit losses $ 2,012 $ 500 $ ( 6 ) $ 551 $ 1,955 Column A Column B Column C Column D Column E Column F Description Balance at Additions Other Deductions Balance at (in thousands) Valuation reserve deducted in the balance sheet Deferred taxes: 2024 Valuation allowance $ 109,251 $ 8,809 $ ( 41 ) $ 765 $ 117,254 2023 Valuation allowance $ 103,807 $ 5,759 $ 59 $ 374 $ 109,251 2022 Valuation allowance $ 97,170 $ 7,652 $ 21 $ 1,036 $ 103,807

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
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 revenue, inventories, investments, goodwill, intangible and other long-lived assets, accounts receivable, income taxes, deferred tax assets and liabilities, pensions, warranties, 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 Annual Report on Form 10-K. These estimates may change, as new events occur and additional information is obtained. Actual results may differ significantly from these estimates under different assumptions or conditions.
Revenue Recognition	Revenue Recognition Revenue from Contracts with Customers In accordance with ASC 606, Teradyne recognizes revenues, when or as control is transferred to a customer. Teradyne’s determination of revenue is dependent upon a five-step process outlined below. • Teradyne accounts for a contract with a customer when there is written approval, the contract is committed, the rights of the parties, including payment terms, are identified, the contract has commercial substance and consideration is probable of collection. • Teradyne periodically enters into contracts with customers in which a customer may purchase a combination of goods and services, such as products with extended warranty obligations. Teradyne determines performance obligations by assessing whether the products or services are distinct from the other elements of the contract. In order to be distinct, the product or service must perform either on its own or with readily available resources and must be separate within the context of the contract. • Teradyne determines the transaction price to be the amount of consideration to which Teradyne expects to be entitled to, which is generally at contractually stated prices. • Transaction price is allocated to each individual performance obligation based on the standalone selling price of that performance obligation. Teradyne uses standalone transactions when available to value each performance obligation. If standalone transactions are not available, Teradyne will estimate the standalone selling price through market assessments or cost plus a reasonable margin analysis. Any discounts from standalone selling price are spread proportionally to each performance obligation. • In order to determine the appropriate timing for revenue recognition, Teradyne first determines if the transaction meets any of three criteria for over time recognition. If the transaction meets the criteria for over time recognition, Teradyne recognizes revenue as the good or service is delivered. Teradyne uses input variables such as hours or months utilized or costs incurred to determine the amount of revenue to recognize in a given period. Input variables are used as they best align consumption with benefit to the customer. For transactions that do not meet the criteria for over time recognition, Teradyne will recognize revenue at a point in time based on an assessment of the five criteria for transfer of control. Teradyne has concluded that revenue should be recognized when shipped or delivered based on contractual terms. Typically, acceptance of Teradyne’s products and services is a formality as Teradyne delivers similar systems, instruments and robots to standard specifications. In cases where acceptance is not deemed a formality, Teradyne will defer revenue recognition until customer acceptance. Performance Obligations Products Teradyne products consist primarily of semiconductor test systems and instruments, defense/aerospace test instrumentation and systems, storage test systems and instruments, circuit-board test and inspection systems and instruments, wireless test systems and robotics products. Teradyne’s hardware is typically recognized at a point in time upon transfer of control to the customer. Services Teradyne services consist of extended warranties, training and application support, service agreements, post contract customer support (“PCS”) and replacement parts. Each service is recognized based on relative standalone selling price. Extended warranty, training and support, service agreements and PCS are recognized over time based on the period of service. Replacement parts are recognized at a point in time upon transfer of control to the customer. Teradyne does not allow customer returns or provide refunds to customers for any products or services. Teradyne products include a standard 12 -month warranty. This warranty is not considered a distinct performance obligation because it does not obligate Teradyne to provide a separate service to the customer and it cannot be purchased separately. Cost related to warranties are included in cost of revenues when product revenues are recognized. As of December 31, 2024 and 2023, deferred revenue and customer advances consisted of the following and are included in the short and long-term deferred revenue and customer advances: 2024 2023 (in thousands) Maintenance, service and training $ 58,473 $ 66,458 Customer advances, undelivered elements and other 48,118 35,731 Extended warranty 41,624 34,897 Total deferred revenue and customer advances $ 148,215 $ 137,086
Product Warranty	Product Warranty Teradyne generally provides a one-year warranty on its products, commencing upon installation, acceptance or shipment. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience. Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities: Amount (in thousands) Balance at December 31, 2021 $ 24,577 Accruals for warranties issued during the period 21,851 Accruals related to pre-existing warranties ( 5,618 ) Settlements made during the period ( 26,629 ) Balance at December 31, 2022 14,181 Accruals for warranties issued during the period 21,644 Accruals related to pre-existing warranties ( 1,576 ) Settlements made during the period ( 18,551 ) Balance at December 31, 2023 15,698 Accruals for warranties issued during the period 11,315 Accruals related to pre-existing warranties ( 1,078 ) Settlements made during the period ( 12,973 ) Balance at December 31, 2024 $ 12,962 When Teradyne receives revenue for extended warranties, beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances: Amount (in thousands) Balance at December 31, 2021 $ 64,168 Deferral of new extended warranty revenue 33,686 Recognition of extended warranty deferred revenue ( 41,674 ) Balance at December 31, 2022 56,180 Deferral of new extended warranty revenue 14,330 Recognition of extended warranty deferred revenue ( 35,613 ) Balance at December 31, 2023 34,897 Deferral of new extended warranty revenue 29,990 Recognition of extended warranty deferred revenue ( 23,263 ) Balance at December 31, 2024 $ 41,624
Accounts Receivable and Allowance for Credit Losses	Accounts Receivable and Allowance for Credit Losses Trade accounts receivable are recorded at the invoiced amount and do not bear interest. Teradyne maintains allowances for estimated losses resulting from the inability of its customers to make required payments. Estimated allowances for credit losses are reviewed periodically taking into account the customer’s recent payment history, the customer’s current financial statements and other information regarding the customer’s creditworthiness. Account balances are written off against the allowance when it is determined the receivable will not be recovered. Teradyne sells certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. Teradyne accounts for these transactions as sales of receivables and presents cash proceeds as a cash provided by operating activities in the consolidated statements of cash flows. Total trade accounts receivable sold under the factoring agreements were $ 129.0 million and $ 243.5 million during 2024 and 2023 , respectively. Factoring fees for the sales of receivables are recorded in interest expense and are not material.
Equity Method Investments	Equity Method Investments Teradyne accounts for investments using the equity method of accounting when it has significant influence over the financial and operating policies, but not control, of the investee. The equity method investments are initially recorded at cost and included in ‘Equity method investment’ in the consolidated balance sheet. Teradyne records its share of investee's net income or loss and other comprehensive income, and the amortization of equity method basis difference, calculated as the difference between the investment and the amount of underlying equity in net assets acquired, on a 3-month lag, which is applied consistently from period to period. Teradyne's share of investee's net income and the amortization of equity method basis difference are reported in ‘Equity in net earnings of affiliate’ in the consolidated statement of operations. Teradyne includes its share of investee's other comprehensive income and a cumulative translation adjustment in the consolidated statements of comprehensive income. Teradyne monitors on an ongoing basis its equity method investments for indicators of other-than-temporary declines in fair value below carrying value.
Inventories	Inventories Inventories are stated at the lower of cost (first-in, first-out basis) or net realizable value. On a quarterly basis, Teradyne uses consistent methodologies to evaluate all inventories for net realizable value. Teradyne records a provision for both excess and obsolete inventory when such write-downs or write-offs are identified through the quarterly review process. The inventory valuation is based upon assumptions about future demand, product mix and possible alternative uses.
Investments	Investments Teradyne accounts for its investments in debt and equity securities in accordance with the provisions of ASC 320-10, “ Investments—Debt and Equity Securities .” ASC 320-10 requires that certain debt and equity securities be classified into one of three categories; trading, available-for-sale or held-to-maturity securities. On a quarterly basis, Teradyne reviews its investments to identify and evaluate those that have an indication of a potential other-than-temporary impairment. Factors considered in determining whether a loss is other-than-temporary include: • The length of time and the extent to which the market value has been less than cost; • The financial condition and near-term prospects of the issuer; and • The intent and ability to retain the investment in the issuer for a period of time sufficient to allow for any anticipated recovery in market value. Teradyne uses the market and income approach techniques to value its financial instruments and there were no changes in valuation techniques during the twelve months ended December 31, 2024 and 2023. Teradyne measures its debt and equity investments at fair value, in accordance with ASC 820-10, “ Fair Value Measurements and Disclosures. ” ASC 820-10 defines fair value as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants and requires that assets and liabilities carried at fair value be classified and disclosed in one of the following three categories: Level 1: Quoted prices in active markets for identical assets as of the reporting date; Level 2: Inputs other than Level 1, that are observable either directly or indirectly as of the reporting date. For example, a common approach for valuing fixed income securities is the use of matrix pricing. Matrix pricing is a mathematical technique used to value securities by relying on the securities’ relationship to other benchmark quoted prices, and is considered a Level 2 input; or Level 3: Unobservable inputs that are not supported by market data. Unobservable inputs are developed based on the best information available, which might include Teradyne’s own data. Teradyne’s debt investments are classified as Level 2, and equity investments are classified as Level 1.
Financial Assets and Financial Liabilities	Financial Assets and Financial Liabilities Teradyne records changes in fair value of equity securities directly in earnings and unrealized gains and losses in other (income) expense, net, in accordance with ASU 2016-01, “ Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities .”
Prepayments	Prepayments Prepayments consist of the following: 2024 2023 (1) (in thousands) Contract manufacturer and supplier prepayments $ 365,875 $ 502,257 Prepaid maintenance and other services 22,176 17,592 Prepaid taxes 22,211 16,083 Other prepayments 18,824 13,038 Total prepayments $ 429,086 $ 548,970 (1) Excludes $ 5.3 million of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: "Dispositions" for additional information.
Retirement and Postretirement Plans	Retirement and Postretirement Plans Teradyne recognizes net actuarial gains and losses and the change in the fair value of the plan assets in its operating results in the year in which they occur or upon any interim remeasurement of the plans. Teradyne calculates the expected return on plan assets using the fair value of the plan assets. Actuarial gains and losses are generally measured annually as of December 31 and, accordingly, recorded during the fourth quarter of each year or upon any interim remeasurement of the plans. Teradyne reports net periodic pension cost and net periodic postretirement benefit costs in accordance with ASU 2017-07, “ Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost .” The service cost component of net benefit costs is reported in the same line item in the consolidated statement of operations as other employee compensation costs. The non-service components of net benefit costs such as interest cost, expected return on assets, amortization of prior service cost, and actuarial gains or losses, are reported within other (income) expense, net.
Goodwill, Intangible and Long-Lived Assets	Goodwill, Intangible and Long-Lived Assets Teradyne accounts for goodwill and intangible assets in accordance with ASC 350-10, “ Intangibles-Goodwill and Other. ” Intangible assets are amortized over their estimated useful economic life and are carried at cost less accumulated amortization. Goodwill is assessed for impairment at least annually in the fourth quarter, as of December 31, on a reporting unit basis, or more frequently when events and circumstances occur indicating that the recorded goodwill may be impaired. In accordance with ASC 350-10, Teradyne has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If Teradyne determines this is the case, Teradyne is required to perform a quantitative goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. If Teradyne determines that it is more likely than not that the fair value of the reporting unit is greater than its carrying amounts, a quantitative goodwill impairment test is not required. In accordance with ASC 360-10, “ Impairment or Disposal of Long-Lived Assets, ” 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. Each impairment test is based on a comparison of the estimated undiscounted cash flows to the recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flows analysis. The cash flows estimates used to determine the impairment, if any, contain management’s best estimates using appropriate assumptions and projections at that time.
Business Combination	Business Combination Teradyne recognizes the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. The fair value of identifiable intangible assets is based on detailed cash flows valuations that use information and assumptions provided by management. Teradyne uses all pertinent information known at the time of acquisition to estimate the fair value of contingent consideration at the time of the acquisition using all pertinent information known to us at the time to assess the probability of payment of contingent amounts or through the use of a Monte Carlo simulation model. Teradyne allocates any excess purchase price over the fair value of the net tangible and intangible assets acquired and liabilities assumed to goodwill. The assumptions used in the valuations for our acquisitions may differ materially from actual results depending on performance of the acquired businesses and other factors. While Teradyne believes the assumptions used were appropriate, different assumptions in the valuation of assets acquired and liabilities assumed could have a material impact on the timing and extent of impact on our statements of operations. Goodwill is assigned to reporting units as of the date of the related acquisition.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at cost and depreciated over the estimated useful lives of the assets. Leasehold improvements and major renewals are capitalized and included in property, plant and equipment accounts, while expenditures for maintenance and repairs and minor renewals are charged to expense. When assets are retired, the assets and related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations. Teradyne provides for depreciation of its assets principally on the straight-line method with the cost of the assets being charged to expense over their useful lives as follows: Buildings 40 years Building improvements 5 to 10 years Leasehold improvements Lesser of lease term or 10 years Furniture and fixtures 10 years Test systems manufactured internally 6 years Machinery, equipment and software 3 to 5 years Test systems manufactured internally are used by Teradyne for customer evaluations and manufacturing and support of its customers. Teradyne depreciates the test systems manufactured internally over a six-year life to cost of revenues, engineering and development, and selling and administrative expenses. Teradyne often sells internally manufactured test equipment to customers. Upon the sale of an internally manufactured test system, the net book value of the system is transferred to inventory and expensed as cost of revenues. The net book value of internally manufactured test systems sold in the years ended December 31, 2024, 2023, and 2022 was $ 4.0 million, $ 2.8 million, and $ 6.6 million, respectively.
Convertible Debt	Convertible Debt Teradyne adopted Accounting Standards Update (“ASU”) ASU 2020-06 – “Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity’s Own Equity,” on January 1, 2022 using the modified retrospective method of adoption. As a result of adoption, Teradyne recorded an increase of $ 1.4 million to current debt for unsettled shares, an increase of $ 1.8 million to deferred tax assets, an increase of $ 6.6 million to long-term debt for unamortized debt discount, and an increase to retained earnings of $ 94.6 million for the reclassification of the equity component. Mezzanine equity representing unsettled shares value was reduced to zero and additional paid-in capital was reduced by $ 100.8 million. In accordance with ASU 2020-06, Teradyne accounts for a convertible debt instrument as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. Unsettled shares are recorded in current debt, and there is no recognition of a debt discount, which was previously amortized to interest expense. Settled shares reduce the outstanding debt balance in an amount equal to the cash paid, but do not result in any gain or loss on extinguishment. We use the if-converted method in the diluted EPS calculation for convertible instruments.
Leases	Leases Under ASC 842, a contract is or contains a lease when Teradyne has the right to control the use of an identified asset. Teradyne determines if an arrangement is a lease at inception of the contract, which is the date on which the terms of the contract are agreed to and the agreement creates enforceable rights and obligations. The commencement date of the lease is the date that the lessor makes an underlying asset available for use by Teradyne. As of December 31, 2024, Teradyne does not have material leases that have not yet commenced. Teradyne determines if the lease is an operating or finance lease at the lease commencement date based upon the terms of the lease and the nature of the asset. The lease term used to calculate the lease liability includes options to extend or terminate the lease when it is reasonably certain that the option will be exercised. The lease liability is measured at the present value of future lease payments, discounted using the discount rate for the lease at the commencement date. As Teradyne is typically unable to determine the implicit rate, Teradyne uses an incremental borrowing rate based on the lease term and economic environment at commencement date. Teradyne initially measures payments based on an index by using the applicable rate at lease commencement. Variable payments that do not depend on an index are not included in the lease liability and are recognized as they are incurred. The right-of-use (“ROU”) asset is initially measured as the amount of lease liability, adjusted for any initial lease costs, prepaid lease payments, and reduced by any lease incentives. Teradyne’s contracts often include non-lease components such as common area maintenance. Teradyne elected the practical expedient to account for the lease and non-lease components as a single lease component. For leases with a term of one year or less, Teradyne has elected not to record the lease asset or liability. Rent is recognized in the consolidated statement of earnings on a straight-line basis over the lease term. Teradyne includes lease costs within cost of revenues and operating expenses. See Note J: “Leases.”
Engineering and Development Costs	Engineering and Development Costs Teradyne’s products are highly technical and require a large and continuing engineering and development effort. Software development costs incurred prior to the establishment of technological feasibility are charged to expense. Software development costs incurred subsequent to the establishment of technological feasibility are capitalized until the product is available for release to customers. To date, the period between achieving technological feasibility and general availability of the product has been short and software development costs eligible for capitalization have not been material. Engineering and development costs are expensed as incurred and consist primarily of salaries, contractor fees including non-recurring engineering charges related to product design, allocated facility costs, depreciation, and tooling costs.
Stock Compensation Plans and Employee Stock Purchase Plan	Stock Compensation Plans and Employee Stock Purchase Plan Stock-based compensation expense is based on the grant-date fair value estimated in accordance with the provisions of ASC 718-10, “ Compensation-Stock Compensation .” Teradyne elects to account for forfeitures by applying an estimated forfeiture rate and recognizes compensation costs only for those stock-based compensation awards expected to vest. Under its stock compensation plans, Teradyne has granted stock options, restricted stock units and performance-based restricted stock units, and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”). Excess tax benefits or tax deficiencies are recognized as a discrete tax benefit or discrete tax expense to the current income tax provision in Teradyne’s consolidated statements of operations, all excess tax benefits related to share-based payments are reported as cash flows from operating activities, and all cash payments made to taxing authorities on the employees’ behalf for withheld shares are presented as financing activities on the statement of cash flows.
Income Taxes	Income Taxes Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The measurement of deferred tax assets is reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be realized. Teradyne performed the required assessment of positive and negative evidence regarding the realization of the net deferred tax assets in accordance with ASC 740, “Accounting for Income Taxes.” This assessment included the evaluation of scheduled reversals of deferred tax liabilities, estimates of projected future taxable income and tax-planning strategies. Although realization is not assured, based on its assessment, Teradyne concluded that it is more likely than not that such assets, net of the existing valuation allowance, will be realized.
Advertising Costs	Advertising Costs Teradyne expenses all advertising costs as incurred. Advertising costs were $ 16.1 million, $ 15.5 million and $ 17.3 million in 2024, 2023 and 2022 , respectively.
Translation of Non-U.S. Currencies	Translation of Non-U.S. Currencies The functional currency for all non-U.S. subsidiaries is the U.S. dollar, except for Robotics and Lemsys for which the local currency is its functional currency. All foreign currency denominated monetary assets and liabilities are remeasured on a monthly basis into the functional currency using exchange rates in effect at the end of the period. All foreign currency denominated non-monetary assets and liabilities are remeasured into the functional currency using historical exchange rates. Net foreign exchange gains and losses resulting from remeasurement are included in other (income) expense, net. For Robotics and Lemsys, assets and liabilities are translated into U.S. dollars using exchange rates in effect at the end of the period. Revenues and expense amounts are translated using an average of exchange rates in effect during the period. Translation adjustments are recorded within accumulated other comprehensive income (loss) on the balance sheet. Net foreign exchange gains and losses resulting from remeasurement are included in other (income) expense, net. For the years ended December 31, 2024, 2023 and 2022, losses (gains) from the remeasurement of the monetary assets and liabilities denominated in foreign currencies were $ 2.8 million, $ 10.9 million, and $ 10.8 million, respectively. These amounts do not reflect the corresponding (gains) losses from foreign exchange contracts. See Note I: “Financial Instruments” regarding foreign exchange contracts.
Net Income per Common Share	Net Income per Common Share Basic net income per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, diluted net income per common share is calculated by dividing net income by the sum of the weighted average number of common shares plus common stock equivalents, if applicable. With respect to its convertible debt issued in 2016, Teradyne was required to settle the principal of the convertible debt in cash; accordingly, the principal amount was excluded from the determination of diluted earnings per share. As a result, Teradyne is accounting for the conversion spread using the treasury stock method.
Comprehensive Income	Comprehensive Income Comprehensive income includes net income, unrealized pension and postretirement prior service costs and benefits, unrealized gains and losses on investments in debt marketable securities, unrealized gains and losses on cash flow hedge and foreign currency translation adjustment.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Deferred Revenue and Customer Advances	As of December 31, 2024 and 2023, deferred revenue and customer advances consisted of the following and are included in the short and long-term deferred revenue and customer advances: 2024 2023 (in thousands) Maintenance, service and training $ 58,473 $ 66,458 Customer advances, undelivered elements and other 48,118 35,731 Extended warranty 41,624 34,897 Total deferred revenue and customer advances $ 148,215 $ 137,086
Other Accrued Liabilities	Amount (in thousands) Balance at December 31, 2021 $ 24,577 Accruals for warranties issued during the period 21,851 Accruals related to pre-existing warranties ( 5,618 ) Settlements made during the period ( 26,629 ) Balance at December 31, 2022 14,181 Accruals for warranties issued during the period 21,644 Accruals related to pre-existing warranties ( 1,576 ) Settlements made during the period ( 18,551 ) Balance at December 31, 2023 15,698 Accruals for warranties issued during the period 11,315 Accruals related to pre-existing warranties ( 1,078 ) Settlements made during the period ( 12,973 ) Balance at December 31, 2024 $ 12,962
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances	Amount (in thousands) Balance at December 31, 2021 $ 64,168 Deferral of new extended warranty revenue 33,686 Recognition of extended warranty deferred revenue ( 41,674 ) Balance at December 31, 2022 56,180 Deferral of new extended warranty revenue 14,330 Recognition of extended warranty deferred revenue ( 35,613 ) Balance at December 31, 2023 34,897 Deferral of new extended warranty revenue 29,990 Recognition of extended warranty deferred revenue ( 23,263 ) Balance at December 31, 2024 $ 41,624
Summary of Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	Prepayments consist of the following: 2024 2023 (1) (in thousands) Contract manufacturer and supplier prepayments $ 365,875 $ 502,257 Prepaid maintenance and other services 22,176 17,592 Prepaid taxes 22,211 16,083 Other prepayments 18,824 13,038 Total prepayments $ 429,086 $ 548,970 (1) Excludes $ 5.3 million of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: "Dispositions" for additional information.
Useful Lives of Assets	Teradyne provides for depreciation of its assets principally on the straight-line method with the cost of the assets being charged to expense over their useful lives as follows: Buildings 40 years Building improvements 5 to 10 years Leasehold improvements Lesser of lease term or 10 years Furniture and fixtures 10 years Test systems manufactured internally 6 years Machinery, equipment and software 3 to 5 years

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 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 Robotics Reportable Segments All Other System-on-a-chip Memory IST Corporate Total (in thousands) For the Year Ended December 31, 2024 (1) Timing of Revenue Recognition Point in Time $ 1,255,579 $ 472,279 $ 63,288 $ 356,384 $ 2,147,530 $ 266,955 $ — $ 2,414,485 Over Time 281,545 29,509 21,720 $ 8,464 341,238 64,157 — $ 405,395 Total $ 1,537,124 $ 501,788 $ 85,008 $ 364,848 $ 2,488,768 $ 331,112 $ — $ 2,819,880 Geographical Market Asia Pacific $ 1,400,149 $ 466,214 $ 78,719 $ 69,353 $ 2,014,435 $ 113,263 $ — $ 2,127,698 Americas 92,386 15,017 6,289 $ 147,607 261,299 174,084 — $ 435,383 Europe, Middle East and Africa 44,589 20,557 — $ 147,888 213,034 43,765 — $ 256,799 Total $ 1,537,124 $ 501,788 $ 85,008 $ 364,848 $ 2,488,768 $ 331,112 $ — $ 2,819,880 For the Year Ended December 31, 2023 (1) Timing of Revenue Recognition Point in Time $ 1,141,882 $ 356,417 $ 115,220 $ 363,238 $ 1,976,757 $ 282,558 $ — $ 2,259,315 Over Time 290,739 29,598 23,332 $ 11,945 355,614 61,369 — $ 416,983 Total $ 1,432,621 $ 386,015 $ 138,552 $ 375,183 $ 2,332,371 $ 343,927 $ — $ 2,676,298 Geographical Market Asia Pacific $ 1,214,322 $ 366,151 $ 135,502 $ 73,736 $ 1,789,711 $ 103,300 $ — $ 1,893,011 Americas 117,728 11,367 3,050 $ 147,952 280,097 199,299 — $ 479,396 Europe, Middle East and Africa 100,571 8,497 — $ 153,495 262,563 41,328 — $ 303,891 Total $ 1,432,621 $ 386,015 $ 138,552 $ 375,183 $ 2,332,371 $ 343,927 $ — $ 2,676,298 For the Year Ended December 31, 2022 (1) Timing of Revenue Recognition Point in Time $ 1,445,238 $ 344,693 $ 248,919 $ 391,326 $ 2,430,176 $ 342,195 $ 251 $ 2,772,622 Over Time 261,646 29,013 21,094 $ 11,812 323,565 58,858 — $ 382,423 Total $ 1,706,884 $ 373,706 $ 270,013 $ 403,138 $ 2,753,741 $ 401,053 $ 251 $ 3,155,045 Geographical Market Asia Pacific $ 1,514,964 $ 360,176 $ 266,729 $ 89,654 $ 2,231,523 $ 168,388 $ — $ 2,399,911 Americas 122,575 11,987 3,284 $ 147,416 285,262 190,106 251 $ 475,619 Europe, Middle East and Africa 69,345 1,543 — $ 166,068 236,956 42,559 — $ 279,515 Total $ 1,706,884 $ 373,706 $ 270,013 $ 403,138 $ 2,753,741 $ 401,053 $ 251 $ 3,155,045 (1) Includes $ 3.7 m illion, $ 5.2 million and $ 8.2 million in 2024, 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”

Dispositions (Tables)

Dispositions (Tables)	12 Months Ended
	Dec. 31, 2024
Device Interface Solutions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Schedule of Assets and Liabilities Related to the DIS Sale Agreement	Assets and liabilities related to the DIS sale agreement met the criteria and were classified as held for sale in Teradyne’s consolidated balance sheet as of December 31, 2023, as follows: December 31, 2023 (in thousands) Current assets: Inventories, net $ 17,952 Prepayments 5,298 Total current assets held for sale 23,250 Property, plant and equipment, net 8,986 Operating lease right-of-use assets, net 2,545 Total assets held for sale $ 34,781 Current liabilities: Accounts payable $ 6,356 Other accrued liabilities 552 Operating lease liabilities 471 Total current liabilities held for sale 7,379 Long-term operating lease liabilities 2,000 Total liabilities held for sale $ 9,379 Net assets held for sale $ 25,402

Equity Method Investment (Table

Equity Method Investment (Tables)	12 Months Ended
	Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Summary of Equity Method Investment	(in thousands) Balance at May 27, 2024 $ 524,060 Other comprehensive income related to investment ( 22,355 ) Equity in net earnings of affiliate ( 7,211 ) Balance at December 31, 2024 $ 494,494

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2024
Inventory Disclosure [Abstract]
Composition of Inventories, Net	Inventories, net consisted of the following at December 31, 2024 and 2023: 2024 2023 (1) (in thousands) Raw material $ 225,915 $ 258,422 Work-in-process 41,964 26,851 Finished goods 30,613 24,701 $ 298,492 $ 309,974 (1) Excludes $ 18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property Plant and Equipment, Net	Property, plant and equipment, net consisted of the following at December 31, 2024 and 2023: 2024 2023 (1) (in thousands) Land $ 19,409 $ 19,487 Buildings 183,371 127,705 Machinery, equipment and software 1,157,784 1,047,235 Furniture and fixtures 28,432 28,093 Leasehold improvements 67,387 66,777 Construction in progress 5,678 54,799 1,462,061 1,344,096 Less: accumulated depreciation 953,890 898,604 $ 508,171 $ 445,492 (1) Excludes $ 9.0 million of property, plant and equipment, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The following table sets forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2024 and 2023 : December 31, 2024 Quoted Prices Significant Significant Total (in thousands) Assets Cash $ 261,176 $ — $ — $ 261,176 Cash equivalents 283,037 9,141 — 292,178 Available for sale securities: U.S. Treasury securities — 44,942 — 44,942 Corporate debt securities — 35,696 — 35,696 Certificates of deposit and time deposits — 21,689 — 21,689 Debt mutual funds 8,951 — — 8,951 U.S. government agency securities — 3,970 — 3,970 Non-U.S. government securities — 773 — 773 Equity securities: Mutual funds 54,412 — — 54,412 Total $ 607,576 $ 116,211 $ — $ 723,787 Derivative assets — 1,665 — 1,665 Total $ 607,576 $ 117,876 $ — $ 725,452 Liabilities Derivative liabilities — 1,324 — 1,324 Total $ — $ 1,324 $ — $ 1,324 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 544,213 $ 9,141 $ — $ 553,354 Marketable securities — 46,312 — 46,312 Long-term marketable securities 63,363 60,758 — 124,121 Other current assets — 1,665 — 1,665 Total $ 607,576 $ 117,876 $ — $ 725,452 Liabilities Other current liabilities $ — $ 1,324 $ — $ 1,324 Total $ — $ 1,324 $ — $ 1,324 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 Total $ 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 Other current assets — 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 December 31, 2024 and 2023 were as follows: December 31, 2024 December 31, 2023 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 553,354 $ 553,354 $ 757,571 $ 757,571 Marketable securities 170,433 170,433 179,588 179,588 Derivative assets 1,665 1,665 18,746 18,746 Liabilities Derivative liabilities 1,324 1,324 2,545 2,545
Schedule of Available-for-Sale Marketable Securities	The following tables summarize the composition of available-for-sale marketable securities at December 31, 2024 and 2023: December 31, 2024 Available-for-Sale Cost Unrealized Unrealized Fair Market Fair Market (in thousands) U.S. Treasury securities $ 49,879 $ 14 $ ( 4,951 ) $ 44,942 $ 30,530 Corporate debt securities 40,395 79 ( 4,778 ) 35,696 27,824 Certificates of deposit and time deposits 21,689 — — 21,689 — Debt mutual funds 9,299 — ( 348 ) 8,951 3,238 U.S. government agency securities 3,966 5 ( 1 ) 3,970 1,946 Non-U.S. government securities 773 — — 773 — $ 126,001 $ 98 $ ( 10,078 ) $ 116,021 $ 63,538 Reported as follows: Cost Unrealized Unrealized Fair Market Fair Market (in thousands) Marketable securities $ 46,349 $ 16 $ ( 53 ) $ 46,312 $ 10,454 Long-term marketable securities 79,652 82 ( 10,025 ) $ 69,709 53,084 $ 126,001 $ 98 $ ( 10,078 ) $ 116,021 $ 63,538 December 31, 2023 Available-for-Sale Cost Unrealized Unrealized Fair Market 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 Market 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 marketable securities held at December 31, 2024 were as follows: Cost Fair Value (in thousands) Due within one year $ 46,349 $ 46,312 Due after 1 year through 5 years 25,554 25,316 Due after 5 years through 10 years 8,648 8,232 Due after 10 years 36,151 27,210 Total $ 116,702 $ 107,070
Schedule of Notional Amount of Derivatives	At December 31, 2024 and 2023, to hedge certain of its local currency balance sheet assets and liabilities, 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 December 31, 2024 December 31, 2023 (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Taiwan dollar $ 14.5 $ 42.7 U.S. dollar/Japanese yen 12.6 11.0 Danish krone/Chinese yuan 10.5 — U.S. dollar/Korean won 4.2 7.2 U.S. dollar/British pound sterling 1.2 1.5 U.S. dollar/Danish krone — 36.0 Singapore dollar/U.S. dollar 28.9 16.6 Euro/U.S. dollar 22.3 25.3 Danish krone/U.S. dollar 16.9 0.7 Philippine peso/U.S. dollar 9.4 10.1 Chinese yuan/U.S. dollar 1.6 1.0 $ 122.1 $ 152.1
Schedule of Foreign Currency Cash Flow Hedges	At December 31, 2024 and 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 December 31, 2024 December 31, 2023 (in millions) Currency Hedged (Buy/Sell) U.S. dollar/Japanese yen $ 15.6 $ 35.5 Total $ 15.6 $ 35.5
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value	he following table summarizes the fair value of derivative instruments as of December 31, 2024 and 2023: Balance Sheet Location December 31, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Other current assets $ 725 $ 733 Foreign exchange option contracts Other current assets — 17,364 Foreign exchange forward contracts Other current liabilities ( 1,324 ) ( 2,545 ) Derivatives designated as hedging instruments: Foreign exchange forward contracts Other current assets 940 648 Total derivatives $ 341 $ 16,200
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized	The following table summarizes the effect of derivative instruments in the statements of operations recognized for the years ended December 31, 2024, 2023, and 2022: Location of (Gains) Losses December 31, December 31, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts (1) Other (income) expense, net $ 3,226 $ ( 1,843 ) $ ( 2,482 ) Foreign exchange option contracts Other (income) expense, net 9,764 ( 7,464 ) — Derivatives designated as hedging instruments: Foreign exchange forward and option contracts Revenue ( 2,402 ) ( 3,127 ) ( 251 ) Total derivatives $ 10,588 $ ( 12,434 ) $ ( 2,733 ) (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 years ended December 31, 2024, 2023 and 2022, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 2.8 million, $ 10.9 million, and $ 10.8 million, respectively.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases, Operating [Abstract]
Supplemental cash flow information related to leases	Supplemental cash flows information related to leases was as follows: For the Years Ended December 31, December 31, December 31, (in thousands) Cash paid for amounts included in the measurement of lease $ 23,990 $ 26,059 $ 20,775 Right-of-use assets obtained in exchange for new lease obligations 18,358 17,987 26,149
Schedule of operating lease, maturity	Maturities of lease liabilities as of December 31, 2024 were as follows: Operating Lease (in thousands) 2025 $ 21,872 2026 17,729 2027 13,991 2028 9,608 2029 7,332 Thereafter 20,760 Total lease payments 91,292 Less imputed interest ( 14,671 ) Total lease liabilities $ 76,621

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Interest Expense on Teradyne's Senior Notes	The interest expense on Teradyne's senior notes for the years ended December 31, 2024, and December 31, 2023, was as follows: For the Years Ended December 31, December 31, (in thousands) Contractual interest expense on the coupon $ — $ 312 Amortization of the issuance fees recognized as interest expense — 113 Total interest expense on the convertible debt $ — $ 425

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in accumulated other comprehensive income (loss), which is presented net of tax, consist of the following: Foreign Unrealized Unrealized (Losses) Gains on Retirement Total (in thousands) 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, net of tax of 0 , $ 568 , $ 1,537 , $ 0 , respectively 17,407 2,423 5,464 — 25,294 Amounts reclassified from accumulated other comprehensive 0 , $ 12 , $( 686 ), $( 2 ), — 44 ( 2,441 ) ( 7 ) ( 2,404 ) Net current period other comprehensive gain (loss), net of tax 0 $ 580 , $ 851 , $( 2 ), respectively 17,407 2,467 3,023 ( 7 ) 22,890 Balance at December 31, 2023, net of tax of $ 0 , $( 1,728 ), $ 143 , 1,132 ), respectively $ ( 22,442 ) $ ( 6,194 ) $ 506 $ 1,152 $ ( 26,978 ) Other comprehensive gain before reclassifications, net of tax of 0 , $( 470 ), $ 593 , $ 0 , respectively ( 52,847 ) ( 1,699 ) 2,100 — ( 52,446 ) Amounts reclassified from accumulated other comprehensive 0 , $ 24 , $( 527 ), $( 2 ), — 86 ( 1,875 ) ( 7 ) ( 1,796 ) Net current period other comprehensive gain (loss), net of tax 0 $( 446 ), $ 66 , $( 2 ), respectively ( 52,847 ) ( 1,613 ) 225 ( 7 ) ( 54,242 ) Balance at December 31, 2024, net of tax of $ 0 , $( 2,174 ), $ 209 , 1,134 ), respectively $ ( 75,289 ) $ ( 7,807 ) $ 731 $ 1,145 $ ( 81,220 )
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations	Reclassifications out of accumulated other comprehensive income (loss) to the statements of operations for the years ended December 31, 2024, 2023, and 2022, were as follows: Details about Accumulate Other Comprehensive Income (Loss) Components For the years ended Affected Line Item December 31, December 31, December 31, (in thousands) Available-for-sale marketable securities Unrealized (losses) gains, net of tax of $( 24 ), $( 12 ), $( 25 ), $ ( 86 ) $ ( 44 ) $ ( 301 ) Other (income) expense, net Cash flow hedges: Unrealized gains, net of tax of $ 527 , $ 686 , $ 0 , respectively 1,875 2,441 — Revenue Defined benefit pension and postretirement plans: Amortization of prior service benefit, net of tax of $ 2 , $ 2 , $ 2 , 7 7 7 (a) Total reclassifications, net of tax of $ 505 , $ 676 , $( 23 ), respectively $ 1,796 $ 2,404 $ ( 294 ) Net income (a) The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note Q: “Retirement Plans.”

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2024 and 2023 are as follows: Robotics Semiconductor All Other Total (in thousands) Balance at December 31, 2022 Goodwill $ 383,166 $ 262,077 $ 520,518 $ 1,165,761 Accumulated impairment losses — ( 260,540 ) ( 502,026 ) ( 762,566 ) Total Goodwill 383,166 1,537 18,492 403,195 Foreign currency translation adjustment 12,297 160 — 12,457 Balance at December 31, 2023 Goodwill 395,463 262,237 520,518 1,178,218 Accumulated impairment losses — ( 260,540 ) ( 502,026 ) ( 762,566 ) Total Goodwill 395,463 1,697 18,492 415,652 Foreign currency translation adjustment ( 20,165 ) ( 120 ) — ( 20,285 ) Balance at December 31, 2024 Goodwill 375,298 262,117 520,518 1,157,933 Accumulated impairment losses — ( 260,540 ) ( 502,026 ) ( 762,566 ) Total Goodwill $ 375,298 $ 1,577 $ 18,492 $ 395,367
Schedule of Amortizable Intangible Assets	Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets: December 31, 2024 Gross Accumulated Foreign Currency Translation Adjustment Net (in thousands) Developed technology $ 267,706 $ ( 255,448 ) $ ( 5,820 ) $ 6,438 Customer relationships 52,109 ( 49,562 ) 204 2,751 Tradenames and trademarks 59,007 ( 50,805 ) ( 1,464 ) 6,738 Total intangible assets $ 378,822 $ ( 355,815 ) $ ( 7,080 ) $ 15,927 December 31, 2023 Gross Accumulated Foreign Currency Translation Adjustment Net (in thousands) 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 (1) In 2023 , $ 9.3 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
Schedule of Estimated Intangible Assets Amortization Expense	Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows: Year Amortization Expense (in thousands) 2025 $ 11,125 2026 2,325 2027 1,108 2028 1,027 2029 342 Thereafter —

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
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: 2024 2023 2022 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 542,372 $ 448,752 $ 715,501 Weighted average common shares-basic 159,083 154,310 158,434 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 3,563 8,897 8,806 Restricted stock units 651 423 657 Stock options 11 34 52 Employee stock purchase rights 6 7 22 Incremental shares from assumed conversion of convertible notes (2) — 633 1,763 Dilutive potential common shares 4,231 9,994 11,300 Weighted average common shares-diluted 163,314 164,304 169,734 Net income per common share-basic $ 3.41 $ 2.91 $ 4.52 Net income per common share-diluted $ 3.32 $ 2.73 $ 4.22 (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 the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations	The December 31 balances of these defined benefit pension plans assets and obligations are shown below: 2024 2023 United States Foreign United States Foreign (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 144,187 $ 33,984 $ 143,814 $ 29,935 Service cost 881 446 1,063 446 Interest cost 6,292 953 6,888 1,057 Actuarial (gain) loss ( 6,014 ) ( 1,972 ) 3,229 2,738 Benefits paid ( 11,658 ) ( 955 ) ( 10,807 ) ( 947 ) Retiree annuity purchase ( 23,386 ) — — — Liability (gain) loss due to settlement 394 ( 195 ) — ( 254 ) Non-U.S. currency movement — ( 1,988 ) — 1,009 End of year 110,696 30,273 144,187 33,984 Change in plan assets: Fair value of plan assets: Beginning of year 112,617 1,929 111,760 2,087 Actual return on plan assets 779 77 8,613 43 Company contributions 3,065 1,024 3,051 1,028 Benefits paid ( 11,658 ) ( 955 ) ( 10,807 ) ( 947 ) Retiree annuity purchase ( 23,386 ) — — — Settlements gain — ( 195 ) — ( 254 ) Non-U.S. currency movement — 108 — ( 28 ) End of year 81,417 1,988 112,617 1,929 Funded status $ ( 29,279 ) $ ( 28,285 ) $ ( 31,570 ) $ ( 32,055 )
Amounts Recorded within Statement of Financial Position	The following table provides amounts recorded within the account line items of the statements of financial position as of December 31: 2024 2023 United States Foreign United States Foreign (in thousands) Retirement plans assets $ 11,994 $ — $ 11,504 $ — Accrued employees’ compensation and withholdings ( 3,263 ) ( 969 ) ( 3,110 ) ( 1,255 ) Retirement plans liabilities ( 38,010 ) ( 27,316 ) ( 39,964 ) ( 30,800 ) Funded status $ ( 29,279 ) $ ( 28,285 ) $ ( 31,570 ) $ ( 32,055 )
Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets	Information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31: 2024 2023 United States Foreign United States Foreign (in millions) Projected benefit obligation $ 41.3 $ 30.3 $ 43.1 $ 34.0 Accumulated benefit obligation 41.1 29.1 42.6 32.5 Fair value of plan assets — 2.0 — 1.9
Net Periodic Pension and Postretirement Benefit Cost (Income)	For the years ended December 31, 2024, 2023, and 2022, Teradyne’s net periodic pension cost (income) was comprised of the following: 2024 2023 2022 United Foreign United Foreign United Foreign (in thousands) Components of Net Periodic Pension Cost (Income): Service cost $ 881 $ 446 $ 1,063 $ 446 $ 1,588 $ 784 Interest cost 6,292 953 6,888 1,057 4,886 482 Expected return on plan assets ( 4,865 ) ( 77 ) ( 5,194 ) ( 45 ) ( 2,927 ) ( 75 ) Net actuarial (gain) loss ( 1,929 ) ( 1,948 ) 18 2,735 ( 11,170 ) ( 13,259 ) Settlement (gain) loss 394 ( 24 ) ( 209 ) 5 — — Total net periodic pension cost (income) $ 773 $ ( 650 ) $ 2,566 $ 4,198 $ ( 7,623 ) $ ( 12,068 )
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation	Weighted Average Assumptions to Determine Net Periodic Pension Cost at January 1: 2024 2023 2022 United Foreign United Foreign United Foreign Discount rate 4.7 % 3.0 % 3.5 % 3.5 % 2.5 % 1.1 % Expected return on plan assets 4.7 2.5 4.8 1.8 2.0 4.0 Salary progression rate 2.5 2.4 2.4 2.1 2.4 2.2 Weighted Average Assumptions to Determine Pension Obligations at December 31: 2024 2023 United States Foreign United States Foreign Discount rate 5.4 % 3.3 % 4.7 % 3.0 % Salary progression rate 2.5 2.4 2.5 2.4
Weighted Average Pension Asset Allocations by Category	The following table provides weighted average pension asset allocation by asset category at December 31, 2024 and 2023: 2024 2023 United States Foreign United States Foreign Fixed income securities 94.0 % — % 94.0 % — % Equity securities 5.0 — 5.0 — Other 1.0 100.0 1.0 100.0 100.0 % 100.0 % 100.0 % 100.0 %
Target Asset Allocation and Index for Each Asset Category	The target asset allocation and the index for each asset category for the U.S. Plan, per the investment policy, are as follows: Asset Category: Policy Index: Target U.S. corporate fixed income Bloomberg U.S. Corporate A or Better Index, 20+ Year Index 66 % U.S. corporate fixed income Bloomberg U.S. Intermediate Corporate ex Baa Index 9 U.S. government fixed income Bloomberg U.S. 3 - 10 year Treasury Bond Index 12 U.S. government fixed income Bloomberg U.S. Government Bond Index 2 Global equity MSCI World Index 5 High yield fixed income ICE BofA BB-B U.S. High Yield Constrained Index 5 Cash ICE BofA 3 -Month Treasury Bill Index 1
Changes in Fair Value of Pension Assets	The fair value of pension plan assets by asset category and by level at December 31, 2024 and December 31, 2023 were as follows: December 31, 2024 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 65,160 $ — $ 65,160 $ — $ — $ — $ — U.S. government securities — 11,414 — 11,414 — — — — Global equity — 4,025 — 4,025 — — — — Other — — — — — 1,988 — 1,988 Cash and cash equivalents 818 — — 818 — — — — Total $ 818 $ 80,599 $ — $ 81,417 $ — $ 1,988 $ — $ 1,988 December 31, 2023 United States Foreign Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (in thousands) Fixed income securities: Corporate debt securities $ — $ 89,971 $ — $ 89,971 $ — $ — $ — $ — U.S. government securities — 15,817 — 15,817 — — — — Global equity — 5,691 — 5,691 — — — — Other — — — — — 1,929 — 1,929 Cash and cash equivalents 1,138 — — 1,138 — — — — Total $ 1,138 $ 111,479 $ — $ 112,617 $ — $ 1,929 $ — $ 1,929
Expected Future Benefit Payments	Future benefit payments are expected to be paid as follows: United States Foreign (in thousands) 2025 $ 9,202 $ 1,077 2026 8,152 1,208 2027 9,043 1,245 2028 9,135 1,253 2029 9,040 1,422 2030-2034 42,009 8,561
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations	The December 31 balances of the postretirement assets and obligations are shown below: 2024 2023 (in thousands) Assets and Obligations Change in benefit obligation: Projected benefit obligation: Beginning of year $ 6,933 $ 5,345 Service cost 37 34 Interest cost 289 299 Actuarial (gain) loss ( 445 ) 155 Benefits paid ( 1,685 ) ( 1,413 ) Special termination benefits 462 2,513 End of year 5,591 6,933 Change in plan assets: Fair value of plan assets: Beginning of year — — Company contributions 1,685 1,413 Benefits paid ( 1,685 ) ( 1,413 ) End of year — — Funded status $ ( 5,591 ) $ ( 6,933 )
Amounts Recorded within Statement of Financial Position	The following table provides amounts recorded within the account line items of financial position as of December 31: 2024 2023 (in thousands) Accrued employees’ compensation and withholdings $ ( 938 ) $ ( 1,508 ) Retirement plans liabilities ( 4,653 ) ( 5,425 ) Funded status $ ( 5,591 ) $ ( 6,933 )
Amounts Recognized in Accumulated Other Comprehensive Income (loss)	The following table provides amounts recognized in accumulated other comprehensive income (loss) as of December 31: 2024 2023 (in thousands) Prior service credit, before tax $ ( 14 ) $ ( 23 ) Deferred taxes ( 1,693 ) ( 1,691 ) Total recognized in other comprehensive income (loss), net of tax $ ( 1,707 ) $ ( 1,714 )
Net Periodic Pension and Postretirement Benefit Cost (Income)	For the years ended December 31, 2024, 2023, and 2022, Teradyne’s net periodic postretirement benefit cost (income) was comprised of the following: 2024 2023 2022 (in thousands) Components of Net Periodic Postretirement Benefit Cost (income): Service cost $ 37 $ 34 $ 64 Interest cost 289 299 177 Amortization of prior service credit ( 9 ) ( 9 ) ( 9 ) Net actuarial (gain) loss ( 445 ) 155 ( 1,155 ) Special termination benefits 462 2,513 — Total net periodic postretirement benefit cost (income) 334 2,992 ( 923 ) Changes in Plan Assets and Benefit Obligations Recognized in Other Reversal of amortization items: Prior service credit 9 9 9 Total recognized in other comprehensive income 9 9 9 Total recognized in net periodic postretirement cost (income) and other $ 343 $ 3,001 $ ( 914 )
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation	Weighted Average Assumptions to Determine Net Periodic Postretirement Benefit Income as of January 1: 2024 2023 2022 Discount rate 4.7 % 5.0 % 2.6 % Initial health care cost trend rate 7.7 7.2 7.3 Ultimate health care cost trend rate 4.5 4.5 4.5 Year in which ultimate health care cost trend rate is reached 2033 2032 2029 Weighted Average Assumptions to Determine Postretirement Benefit Obligation as of December 31: 2024 2023 2022 Discount rate 5.4 % 4.7 % 5.0 % Initial health care trend 8.6 7.7 7.2 Ultimate health care trend 4.5 4.5 4.5 Medical cost trend rate decrease to ultimate rate in year 2035 2033 2032
Expected Future Benefit Payments	Future benefit payments are expected to be paid as follows: Benefit Payments (in thousands) 2025 $ 938 2026 671 2027 585 2028 510 2029 414 2030-2034 1,719

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
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: 2024 2023 2022 Risk-free interest rate 3.9 % 4.0 % 1.4 % Teradyne volatility-historical 42.4 % 49.7 % 47.1 % NYSE Composite Index volatility-historical 15.6 % 24.1 % 22.7 % Dividend yield 0.5 % 0.4 % 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: 2024 2023 2022 Expected life (years) 4.0 4.0 4.0 Risk-free interest rate 4.0 % 3.8 % 1.6 % Volatility-historical 46.3 % 46.6 % 43.7 % Dividend yield 0.5 % 0.4 % 0.4 %
Stock Compensation Plan Activity	Stock compensation plan activity for the years 2024, 2023 and 2022, is as follows: 2024 2023 2022 (in thousands) Restricted Stock Units: Non-vested at January 1 1,378 1,317 1,417 Awarded 703 728 660 Vested ( 492 ) ( 609 ) ( 709 ) Forfeited ( 62 ) ( 58 ) ( 51 ) Non-vested at December 31 1,527 1,378 1,317 Stock Options: Outstanding at January 1 171 188 171 Granted 49 41 42 Exercised ( 77 ) ( 56 ) ( 25 ) Forfeited ( 2 ) ( 2 ) — Expired — — — Outstanding at December 31 141 171 188 Vested and expected to vest at December 31 141 171 188 Exercisable at December 31 34 68 69
Share Based Compensation Total Shares Available	Total shares available for the years 2024, 2023 and 2022: 2024 2023 2022 (in thousands) Shares available: Available for grant at January 1 4,353 5,062 5,713 Options granted ( 49 ) ( 41 ) ( 42 ) Options forfeited 2 2 — Restricted stock units awarded ( 703 ) ( 728 ) ( 660 ) Restricted stock units forfeited 62 58 51 Available for grant at December 31 3,665 4,353 5,062
Weighted-Average Restricted Stock Unit Award Date Fair Value	Weighted average restricted stock unit award date fair value information for the years 2024, 2023 and 2022, is as follows: 2024 2023 2022 Non-vested at January 1 $ 101.00 $ 88.71 $ 67.97 Awarded 97.06 105.05 108.74 Vested 93.12 75.55 54.27 Forfeited 103.81 102.12 85.71 Non-vested at December 31 $ 101.17 $ 101.00 $ 88.71
Restricted Stock Unit Awards Aggregate Intrinsic Value	Restricted stock unit awards aggregate intrinsic value information at December 31 for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 (in thousands) Vested $ 54,235 $ 62,001 $ 95,408 Outstanding 192,324 149,504 115,087 Expected to vest 177,878 135,238 108,666
Restricted Stock Units Weighted Average Remaining Contractual Terms	Restricted stock units weighted average remaining contractual terms (in years) information at December 31 for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 Outstanding 1.19 1.13 0.99 Expected to vest 1.19 1.13 0.99
Weighted Average Stock Options Exercise Price	Weighted average stock options exercise price information for the year ended December 31, 2024 is as follows: 2024 Outstanding at January 1 $ 94.85 Options granted 95.14 Options exercised 86.02 Options forfeited 112.58 Options cancelled 112.80 Outstanding at December 31 99.51 Exercisable at December 31 91.27
Stock Option Aggregate Intrinsic Value Information	Stock option aggregate intrinsic value information for the years ended December 31, 2024, 2023 and 2022 is as follows: 2024 2023 2022 (in thousands) Exercised $ 2,783 $ 3,901 $ 2,030 Outstanding 3,709 2,647 3,963 Expected to vest 2,531 696 1,583 Vested and exercisable 1,178 1,950 2,380
Stock Options Weighted Average Remaining Contractual Terms	Stock options weighted average remaining contractual terms (in years) information at December 31, for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 Outstanding 4.8 4.4 4.2 Expected to vest 5.2 5.1 4.8 Vested and exercisable 3.3 3.4 3.1
Effect to Income (Loss) from Operations for Recording Stock-Based Compensation	The following table provides the effect to income from operations for recording stock-based compensation for the years ended December 31, 2024, 2023, and 2022: 2024 2023 2022 (in thousands) Cost of revenues $ 4,922 $ 4,208 $ 4,050 Engineering and development 12,531 10,659 9,992 Selling and administrative 42,669 42,815 34,186 Stock-based compensation 60,122 57,682 48,228 Income tax benefit ( 10,472 ) ( 10,397 ) ( 11,493 ) Total stock-based compensation expense after income taxes $ 49,650 $ 47,285 $ 36,735

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Income (Loss) Before Income Taxes and Provision (Benefit) for Income Taxes from Operations	The components of income before income taxes and the provision (benefit) for income taxes as shown in the consolidated statements of operations were as follows: 2024 2023 2022 (in thousands) Income before income taxes: U.S. $ 231,346 $ 307,997 $ 385,968 Non-U.S. 377,740 217,575 454,417 $ 609,086 $ 525,572 $ 840,385 Provision (benefit) for income taxes: Current: U.S. Federal $ 40,296 $ 58,063 $ 86,692 Non-U.S. 62,851 54,037 74,204 State 2,716 2,362 2,681 105,863 114,462 163,577 Deferred: U.S. Federal ( 33,195 ) ( 27,459 ) ( 36,739 ) Non-U.S. ( 9,003 ) ( 8,584 ) 1,232 State ( 4,162 ) ( 1,599 ) ( 3,186 ) ( 46,360 ) ( 37,642 ) ( 38,693 ) Total provision for income taxes: $ 59,503 $ 76,820 $ 124,884
Reconciliation of Effective Tax Rate	A reconciliation of the effective tax rate for the years 2024, 2023 and 2022 is as follows: 2024 2023 2022 U.S. statutory federal tax rate 21.0 % 21.0 % 21.0 % U.S. global intangible low-taxed income 1.2 0.8 1.2 Non-deductible officers’ compensation 0.3 1.1 1.3 Equity compensation — ( 0.4 ) ( 1.1 ) U.S. foreign derived intangible income ( 3.1 ) ( 3.9 ) ( 3.1 ) U.S. research and development credit ( 3.0 ) ( 4.2 ) ( 1.8 ) Foreign taxes ( 2.7 ) 2.5 ( 1.9 ) Uncertain tax positions ( 1.9 ) 0.7 0.1 Foreign tax credits ( 1.3 ) ( 3.3 ) ( 1.0 ) State income taxes, net of federal tax benefit ( 0.1 ) 0.1 ( 0.1 ) Other, net ( 0.6 ) 0.2 0.3 9.8 % 14.6 % 14.9 %
Deferred Tax Assets (Liabilities)	Significant components of Teradyne’s deferred tax assets (liabilities) as of December 31, 2024 and 2023 were as follows: 2024 2023 (in thousands) Deferred tax assets: Tax credits $ 121,635 $ 112,571 Research and development 116,746 82,571 Pension liabilities 25,202 24,997 Accruals 23,946 25,644 Inventory valuations 18,688 19,289 Lease liability 17,828 21,167 Net operating loss carryforwards 16,894 5,737 Deferred revenue 14,562 13,807 Equity compensation 8,901 7,179 Vacation accrual 6,847 6,096 Intangible assets 4,720 2,323 Investment impairment 3,328 3,292 Marketable securities — 128 Other 322 953 Gross deferred tax assets 379,619 325,754 Less: valuation allowance ( 117,254 ) ( 109,251 ) Total deferred tax assets $ 262,365 $ 216,503 Deferred tax liabilities: Depreciation $ ( 18,788 ) $ ( 16,681 ) Right of use assets ( 16,257 ) ( 19,016 ) Contingent consideration ( 5,270 ) ( 5,214 ) Marketable securities ( 650 ) — Total deferred tax liabilities $ ( 40,965 ) $ ( 40,911 ) Net deferred assets $ 221,400 $ 175,592
Operating Loss Carryforwards	At December 31, 2024, Teradyne had tax effected operating loss carryforwards that expire in the following years: State Foreign (in thousands) 2025 $ 4 $ — 2026 — — 2027 — — 2028 10 80 2029 49 465 2030-2034 62 34 2035-2039 37 — Beyond 2039 19 — Non-expiring 54 16,079 Total $ 235 $ 16,658
Unrecognized Tax Benefits	Teradyne’s gross unrecognized tax benefits for the years ended December 31, 2024, 2023 and 2022 were as follows: 2024 2023 2022 (in thousands) Beginning balance as of January 1 $ 18,606 $ 15,608 $ 14,465 Additions: Tax positions for current year — 1,398 Tax positions for prior years 3,024 13 Reductions: Tax positions for prior years ( 2,696 ) ( 26 ) ( 56 ) Expiration of statutes ( 8,247 ) — ( 212 ) Ending balance as of December 31 $ 7,663 $ 18,606 $ 15,608

Segment, Geographic and Signi_2

Segment, Geographic and Significant Customer Information (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Information	Segment information for the years ended December 31, 2024, 2023 and 2022 is as follows: Semiconductor Robotics Reportable Segments All Other Corporate Consolidated (in thousands) 2024 Revenues $ 2,123,920 $ 364,848 $ 2,488,768 $ 331,112 $ — $ 2,819,880 Less: Cost of revenues 866,353 155,080 1,021,433 120,400 — 1,141,833 Engineering and development 295,614 67,306 362,920 46,556 — 409,476 Selling and marketing 187,384 113,327 300,711 50,317 — 351,028 General and administrative 89,952 54,328 144,280 21,282 — 165,562 Other segment items (1)(2) 126,449 52,359 178,808 26,833 ( 62,746 ) 142,895 Income (loss) before taxes (2) 558,168 ( 77,552 ) 480,616 65,724 62,746 609,086 Total assets (3) 1,287,219 742,017 2,029,236 213,749 1,465,730 3,708,714 Property additions 168,130 22,275 190,405 7,690 — 198,095 Depreciation and amortization expense 85,737 27,668 113,405 6,336 — 119,741 2023 Revenues $ 1,957,188 $ 375,183 $ 2,332,371 $ 343,927 $ — $ 2,676,298 Less: Cost of revenues 846,570 151,833 998,403 118,040 — 1,116,443 Engineering and development 257,387 68,668 326,055 44,538 — 370,593 Selling and marketing 162,068 107,157 269,225 50,131 — 319,356 General and administrative 77,786 56,483 134,269 25,104 — 159,373 Other segment items (1)(2) 114,873 45,294 160,167 26,657 ( 1,863 ) 184,961 Income (loss) before taxes (2) 498,504 ( 54,252 ) 444,252 79,457 1,863 525,572 Total assets (3) 1,388,842 737,323 2,126,165 191,055 1,169,605 3,486,824 Property additions 113,664 40,739 154,403 5,239 — 159,642 Depreciation and amortization expense 78,568 25,527 104,095 7,021 ( 230 ) 110,886 2022 Revenues $ 2,350,603 $ 403,138 $ 2,753,741 $ 401,053 $ 251 $ 3,155,045 Less: Cost of revenues 970,972 161,383 1,132,355 125,522 — 1,257,877 Engineering and development 272,296 64,670 336,966 44,111 — 381,077 Selling and marketing 156,520 101,584 258,104 51,888 — 309,992 General and administrative 75,544 57,845 133,389 20,785 — 154,174 Other segment items (1)(2) 131,464 33,785 165,249 34,587 11,704 211,540 Income (loss) before taxes (2) 743,807 ( 16,129 ) 727,678 124,160 ( 11,453 ) 840,385 Total assets (3) 1,435,766 665,638 2,101,403 207,079 1,192,769 3,501,252 Property additions 126,899 25,711 152,610 10,639 — 163,249 Depreciation and amortization expense 76,922 25,339 102,261 7,836 578 110,675 (1) For each reportable segment, the other segment items category includes equity and variable compensation, acquired intangible assets amortization, and restructuring and other charges. (2) Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, acquired intangible amortization, gain on the sale of a business, pension and postretirement plan actuarial gains (losses), legal and environmental fees, contingent consideration adjustments, acquisition and divestiture related expenses, contract termination settlement charge, and an expense for the modification of Teradyne's former chief executive officer's outstanding equity awards. (3) Total assets are attributable to each segment. In 2023, Semiconductor Test includes $ 34.8 million of total assets classified as assets held for sale. See Note E: "Dispositions" for additional information. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.
Revenues by Country	Information as to Teradyne’s revenues by country is as follows: 2024 2023 2022 (in thousands) Revenues from customers (1): Korea $ 695,669 $ 394,690 $ 544,816 Taiwan 601,997 384,842 626,424 China 375,186 314,899 491,798 United States 374,333 433,661 469,948 Europe 251,285 273,784 268,384 Japan 159,827 281,742 162,920 Singapore 90,113 116,969 99,503 Malaysia 62,376 89,197 142,203 Philippines 53,636 189,419 124,107 Thailand 49,268 91,818 137,356 Rest of the World 106,190 105,277 87,586 $ 2,819,880 $ 2,676,298 $ 3,155,045 (1) Revenues attributable to a country are based on location of customer site.
Long-Lived Assets by Geographic Area	Long-lived assets by geographic area: United Foreign (1) Total (in thousands) December 31, 2024 $ 328,733 $ 249,623 $ 578,356 December 31, 2023 (2) $ 322,445 $ 207,995 $ 530,440 (1) As of December 31, 2024 and December 31, 2023, long-lived assets attributable to Denmark were $ 85.1 million and $ 78.1 million, respectively. Long-lived assets attributable to Singapore were $ 74.8 million as of December 31, 2024 . (2) Includes $ 11.5 million of long-lived assets classified as assets held for sale. See Note E: "Dispositions" for additional information.

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Summary Of Significant Accounting Policies [Line Items]
Retained earnings		$ 970,761	$ 706,514
Standard warranty period		12 months
Depreciation over life to cost of revenues and selling and administrative expenses, years		6 years
Net book value of internally manufactured test systems sold		$ 4,000	2,800	$ 6,600
Advertising costs		16,100	15,500	17,300
Losses (gains) on foreign currency transactions		2,800	10,900	$ 10,800
Trade Accounts Receivable		129,000	243,500
Retained earnings	$ 1,800
Additional paid-in capital		$ 1,909,538	$ 1,827,274
Teradyne [Member]
Summary Of Significant Accounting Policies [Line Items]
Retained earnings	94,600
Current debt	1,400
Debt	6,600
Additional paid-in capital	100,800
Teradyne [Member] | Accounting Standards Update 2020-06 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Mezzanine equity	$ 0

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Revenue Disclosure [Abstract]
Maintenance, service and training	$ 58,473	$ 66,458
Customer advances, undelivered elements and other	48,118	35,731
Extended warranty	41,624	34,897	$ 56,180	$ 64,168
Total deferred revenue and customer advances	$ 148,215	$ 137,086

Warranty Accrual Included in Ot

Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 15,698	$ 14,181	$ 24,577
Accruals for warranties issued during the period	11,315	21,644	21,851
Accruals related to pre-existing warranties	(1,078)	(1,576)	(5,618)
Settlements made during the period	(12,973)	(18,551)	(26,629)
Balance at end of period	$ 12,962	$ 15,698	$ 14,181

Extended Product Warranty of Sh

Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 34,897	$ 56,180	$ 64,168
Deferral of new extended warranty revenue	29,990	14,330	33,686
Recognition of extended warranty deferred revenue	(23,263)	(35,613)	(41,674)
Balance at end of period	$ 41,624	$ 34,897	$ 56,180

Schedule of Prepayments and Oth

Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	[1]
Prepayments [Abstract]
Contract manufacturer and supplier prepayments	$ 365,875	$ 502,257
Prepaid maintenance and other services	22,176	17,592
Prepaid taxes	22,211	16,083
Other prepayments	18,824	13,038
Total prepayments	$ 429,086	$ 548,970
[1] Excludes $ 5.3 million of contract manufacturer and supplier prepayments, classified as assets held for sale. See Note E: "Dispositions" for additional information.

Schedule of Prepayments and O_2

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

Useful Lives of Assets (Detail)

Useful Lives of Assets (Detail)	Dec. 31, 2024
Buildings
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	40 years
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	5 years
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	10 years
Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	10 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	10 years
Test Systems Manufactured Internally
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	6 years
Machinery Equipment And Software | Minimum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	3 years
Machinery Equipment And Software | Maximum
Property, Plant and Equipment [Line Items]
Useful lives, maximum years	5 years

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Deferred Revenue And Customer Advances	$ 72.7	$ 108.1	$ 112.4
Revenue, Remaining Performance Obligation, Amount	$ 1,162.2
Short-term Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Percentage	88%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	12 months
Long-term Contract with Customer [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	3 years
Long-term Contract with Customer [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	1 year

Disaggregated Revenue by Primar

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total	[1],[2]	$ 2,819,880	$ 2,676,298	$ 3,155,045
Reportable Segments
Disaggregation of Revenue [Line Items]
Total	[1]	2,488,768	2,332,371	2,753,741
All Other
Disaggregation of Revenue [Line Items]
Total	[1]	331,112	343,927	401,053
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]			251
Point in Time
Disaggregation of Revenue [Line Items]
Total	[1]	2,414,485	2,259,315	2,772,622
Point in Time | Reportable Segments
Disaggregation of Revenue [Line Items]
Total	[1]	2,147,530	1,976,757	2,430,176
Point in Time | All Other
Disaggregation of Revenue [Line Items]
Total	[1]	266,955	282,558	342,195
Point in Time | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]			251
Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	405,395	416,983	382,423
Over Time | Reportable Segments
Disaggregation of Revenue [Line Items]
Total	[1]	341,238	355,614	323,565
Over Time | All Other
Disaggregation of Revenue [Line Items]
Total	[1]	64,157	61,369	58,858
Americas
Disaggregation of Revenue [Line Items]
Total	[1]	435,383	479,396	475,619
Americas | Reportable Segments
Disaggregation of Revenue [Line Items]
Total	[1]	261,299	280,097	285,262
Americas | All Other
Disaggregation of Revenue [Line Items]
Total	[1]	174,084	199,299	190,106
Americas | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]			251
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	256,799	303,891	279,515
Europe, Middle East and Africa | Reportable Segments
Disaggregation of Revenue [Line Items]
Total	[1]	213,034	262,563	236,956
Europe, Middle East and Africa | All Other
Disaggregation of Revenue [Line Items]
Total	[1]	43,765	41,328	42,559
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	2,127,698	1,893,011	2,399,911
Asia Pacific | Reportable Segments
Disaggregation of Revenue [Line Items]
Total	[1]	2,014,435	1,789,711	2,231,523
Asia Pacific | All Other
Disaggregation of Revenue [Line Items]
Total	[1]	113,263	103,300	168,388
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,537,124	1,432,621	1,706,884
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,255,579	1,141,882	1,445,238
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	281,545	290,739	261,646
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	92,386	117,728	122,575
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	44,589	100,571	69,345
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,400,149	1,214,322	1,514,964
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	501,788	386,015	373,706
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	472,279	356,417	344,693
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	29,509	29,598	29,013
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	15,017	11,367	11,987
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	20,557	8,497	1,543
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	466,214	366,151	360,176
IST | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	85,008	138,552	270,013
IST | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	63,288	115,220	248,919
IST | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	21,720	23,332	21,094
IST | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	6,289	3,050	3,284
IST | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	78,719	135,502	266,729
Universal Robots (UR) | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	364,848	375,183	403,138
Universal Robots (UR) | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	356,384	363,238	391,326
Universal Robots (UR) | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	8,464	11,945	11,812
Universal Robots (UR) | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	147,607	147,952	147,416
Universal Robots (UR) | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	147,888	153,495	166,068
Universal Robots (UR) | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	$ 69,353	$ 73,736	$ 89,654
[1] Includes $ 3.7 m illion, $ 5.2 million and $ 8.2 million in 2024, 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.” Revenues attributable to a country are based on location of customer site.

Disaggregated Revenue by Prim_2

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Revenue on leases	$ 3.7	$ 5.2	$ 8.2

Dispositions - Additional Infor

Dispositions - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	May 27, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain on sale of business		$ 57,119	$ 0	$ 0
Device Interface Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 85,000
Pre-tax gain on sale of business	$ 57,100

Schedule of Assets and Liabilit

Schedule of Assets and Liabilities Related to the DIS Sale Agreement (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Prepayments		$ 5,300
Total current assets held for sale	$ 0	23,250
Total assets held for sale	0	11,531
Current liabilities:
Total current liabilities held for sale	0	7,379
Total liabilities held for sale	$ 0	2,000
Device Interface Solutions
Current assets:
Inventories, net		17,952
Prepayments		5,298
Total current assets held for sale		23,250
Property, plant and equipment, net		8,986
Operating lease right-of-use assets, net		2,545
Total assets held for sale		34,781
Current liabilities:
Accounts payable		6,356
Other accrued liabilities		552
Operating lease liabilities		471
Total current liabilities held for sale		7,379
Long-term operating lease liabilities		2,000
Total liabilities held for sale		9,379
Net assets held for sale		$ 25,402

Equity Method Investment - Addi

Equity Method Investment - Additional Information - (Detail) - USD ($)		12 Months Ended
	May 27, 2024	Dec. 31, 2024	Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]
Payment to purchase issued and outstanding shares by Technoprobe	$ 524,100,000
Notional Amount	483,100,000
Equity method investment	$ 524,060,000	$ 494,494,000	$ 0
Percentage of issued and outstanding shares acquired	10%
Fair value of publicly-traded investment in Technoprobe		389,500,000
Equity method investment, other-than-temporary impairment		0
Aggregate cost		$ 200,900,000

Equity Method Investment - Summ

Equity Method Investment - Summary of Equity Method Investment (Detail) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Balance at May 27, 2024	$ 524,060	$ 0
Other comprehensive income related to investment	(22,355)
Equity in net earnings of affiliate	(7,211)	(7,211)	$ 0	$ 0
Balance at December 31, 2024	$ 494,494	$ 494,494	$ 0

Composition of Inventories, Net

Composition of Inventories, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	[1]
Inventory Disclosure [Abstract]
Raw material	$ 225,915	$ 258,422
Work-in-process	41,964	26,851
Finished goods	30,613	24,701
Inventories, net	$ 298,492	$ 309,974
[1] Excludes $ 18.0 million of primarily work-in-process inventories, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Composition of Inventories, N_2

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

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventory reserves	$ 141.4	$ 136

Property Plant and Equipment, N

Property Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	[1]
Property, Plant and Equipment [Abstract]
Land	$ 19,409	$ 19,487
Buildings	183,371	127,705
Machinery, equipment and software	1,157,784	1,047,235
Furniture and fixtures	28,432	28,093
Leasehold improvements	67,387	66,777
Construction in progress	5,678	54,799
Property, Plant and Equipment, Gross, Total	1,462,061	1,344,096
Less: accumulated depreciation	953,890	898,604
Property, plant and equipment, net	$ 508,171	$ 445,492
[1] Excludes $ 9.0 million of property, plant and equipment, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Property Plant and Equipment,_2

Property Plant and Equipment, Net (Parenthetical) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net classified as assets held for sale	$ 9

Property, Plant and Equipment -

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023		Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Depreciation of property, plant and equipment	$ 100,977	$ 92,118		$ 90,763
Machinery and equipment	1,157,784	1,047,235	[1]
Accumulated depreciation	953,890	898,604	[1]
Test Systems Leased By Customers
Property, Plant and Equipment [Line Items]
Machinery and equipment	25,700	5,100
Accumulated depreciation	$ 5,500	$ 4,900
[1] Excludes $ 9.0 million of property, plant and equipment, net classified as assets held for sale. See Note E: "Dispositions" for additional information.

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) $ in Thousands, € in Millions			12 Months Ended
	Apr. 12, 2024 EUR (€)	Nov. 07, 2023 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 27, 2024 USD ($)
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain			$ 2,200	$ 600	$ 800
Available-for-sale securities, realized loss			300	300	100
Fair market value of investments with unrealized losses greater than one year			40,900	65,200
Fair market value of investments with unrealized losses less than one year			22,600	22,300
Unrealized Gain (loss) on contracts			2,800	10,900	10,800
Equity securities unrealized gain			6,700	8,900	1,900
Equity securities unrealized loss			1,200	1,700	11,600
Other comprehensive income (Loss), cash flow hedge, gain (loss), before reclassification, after tax			2,100	5,464	$ (2,517)
Notional Amount						$ 483,100
Call Option
Financial Instruments and Fair Value [Line Items]
Unrealized Gain (loss) on contracts				7,500
Fair value of outstanding contracts				$ 17,400
Expiration date of the option		Apr. 26, 2024
Realized loss on contracts, net			$ 9,800
Accounts Receivable | Customer 2 | Minimum
Financial Instruments and Fair Value [Line Items]
Concentration risk, percentage			10%	18%
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			$ 900	$ 600
Debt Mutual Funds
Financial Instruments and Fair Value [Line Items]
Available for sale securities with out contractual maturity date			9,000
Forward
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			$ (600)	$ (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	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 116,021	$ 132,456
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	44,942	41,808
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	35,696	52,734
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	21,689	21,772
Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	8,951	8,773
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	3,970	4,892
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		1,667
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	773	810
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	723,787	937,159
Derivative assets	1,665	18,746
Total	725,452	955,905
Derivative liabilities	1,324	2,545
Total	1,324	2,545
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	261,176	298,156
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	292,178	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	44,942	41,808
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	35,696	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	21,689	21,772
Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	8,951	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	3,970	4,892
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities		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	773	810
Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	54,412	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	607,576	807,359
Derivative assets	0	0
Total	607,576	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	261,176	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	283,037	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	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	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	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	8,951	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	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	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	54,412	47,132
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	116,211	129,800
Derivative assets	1,665	18,746
Total	117,876	148,546
Derivative liabilities	1,324	2,545
Total	1,324	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	9,141	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	44,942	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	35,696	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	21,689	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	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	3,970	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		1,667
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	773	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	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	0	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	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	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	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	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	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	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	$ 0

Schedule of Reported Financial

Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 725,452	$ 955,905
Liabilities	1,324	2,545
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,324	2,545
Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	1,665	18,746
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	553,354	757,571
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	46,312	62,154
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	124,121	117,434
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	607,576	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) | Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	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	544,213	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	63,363	55,905
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	117,876	148,546
Liabilities	1,324	2,545
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,324	2,545
Significant Other Observable Inputs (Level 2) | Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	1,665	18,746
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	9,141	6,117
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	46,312	62,154
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	60,758	61,529
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) | Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	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

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities	$ 116,021	$ 132,456
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	553,354	757,571
Marketable securities	170,433	179,588
Derivative assets	1,665	18,746
Derivative liabilities	$ 1,324	$ 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	$ 553,354	$ 757,571
Marketable securities	170,433	179,588
Derivative assets	1,665	18,746
Derivative liabilities	$ 1,324	$ 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	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 126,001	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	98	249
Available-for-sale marketable securities, Unrealized (Loss)	(10,078)	(8,170)
Available-for-sale marketable securities, Fair Market Value	116,021	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	63,538	87,538
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	49,879	45,725
Available-for-sale marketable securities, Unrealized Gain	14	14
Available-for-sale marketable securities, Unrealized (Loss)	(4,951)	(3,931)
Available-for-sale marketable securities, Fair Market Value	44,942	41,808
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	30,530	35,080
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	40,395	56,458
Available-for-sale marketable securities, Unrealized Gain	79	201
Available-for-sale marketable securities, Unrealized (Loss)	(4,778)	(3,925)
Available-for-sale marketable securities, Fair Market Value	35,696	52,734
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	27,824	44,263
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	21,689	21,772
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	0	0
Available-for-sale marketable securities, Fair Market Value	21,689	21,772
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	0	0
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	9,299	9,081
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	(348)	(308)
Available-for-sale marketable securities, Fair Market Value	8,951	8,773
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,238	3,303
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	3,966	4,898
Available-for-sale marketable securities, Unrealized Gain	5	0
Available-for-sale marketable securities, Unrealized (Loss)	(1)	(6)
Available-for-sale marketable securities, Fair Market Value	3,970	4,892
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	1,946	4,892
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	773	810
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	0	0
Available-for-sale marketable securities, Fair Market Value	773	810
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 0	0
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost		1,633
Available-for-sale marketable securities, Unrealized Gain		34
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value		1,667
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		$ 0

Schedule Of Foreign Currency Ca

Schedule Of Foreign Currency Cash Flow Hedges (Detail) - USD ($) $ in Millions	Dec. 31, 2024	May 27, 2024	Dec. 31, 2023
Derivative, Notional Amount		$ 483.1
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 15.6		$ 35.5
Foreign Exchange Forward [Member] | Long [Member] | Cash Flow Hedging [Member] | U.S. dollar/Japanese yen
Derivative, Notional Amount	$ 15.6		$ 35.5

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 126,001	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	98	249
Available-for-sale marketable securities, Unrealized (Loss)	(10,078)	(8,170)
Available-for-sale marketable securities, Fair Market Value	116,021	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	63,538	87,538
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	46,349	62,385
Available-for-sale marketable securities, Unrealized Gain	16	36
Available-for-sale marketable securities, Unrealized (Loss)	(53)	(267)
Available-for-sale marketable securities, Fair Market Value	46,312	62,154
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	10,454	34,844
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	79,652	77,992
Available-for-sale marketable securities, Unrealized Gain	82	213
Available-for-sale marketable securities, Unrealized (Loss)	(10,025)	(7,903)
Available-for-sale marketable securities, Fair Market Value	69,709	70,302
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 53,084	$ 52,694

Contractual Maturities of Inves

Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Dec. 31, 2024 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 46,349
Due after 1 year through 5 years, cost	25,554
Due after 5 years through 10 years, cost	8,648
Due after 10 years, cost	36,151
Total, cost	116,702
Due within one year, fair market value	46,312
Due after 1 year through 5 years, fair market value	25,316
Due after 5 years through 10 years, fair market value	8,232
Due after 10 years, fair maket value	27,210
Total, fair market value	$ 107,070

Schedule of Notional Amount of

Schedule of Notional Amount of Derivatives (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	$ 122.1
Derivative Asset, Notional amounts			$ 152.1
U.S. dollar/Taiwan dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	14.5		42.7
U.S. dollar/Japanese yen
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	12.6		11
Danish krone
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	0	¥ 10.5	36	¥ 0
Derivative Asset, Notional amounts	16.9		0.7
U.S. dollar/Korean won
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	4.2		7.2
U.S. dollar/British pound sterling
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	1.2		1.5
Singapore dollar/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	28.9		16.6
Euro/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	22.3		25.3
Philippine peso/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	9.4		10.1
Chinese yuan/U.S. dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 1.6		$ 1

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ 341	$ 16,200
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	725	733
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(1,324)	(2,545)
Not Designated as Hedging Instrument | Foreign Exchange Option [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	17,364
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 940	$ 648

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net		$ 10,588	$ (12,434)	$ (2,733)
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]	3,226	(1,843)	(2,482)
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		9,764	(7,464)	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		$ (2,402)	$ (3,127)	$ (251)
[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 years ended December 31, 2024, 2023 and 2022, net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $ 2.8 million, $ 10.9 million, and $ 10.8 million, respectively.

Schedule of Effect of Derivat_2

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized Gain (loss) on contracts	$ 2.8	$ 10.9	$ 10.8

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases, Operating [Abstract]
Total lease expense	$ 43.6	$ 42.7	$ 40.1
Variable lease costs	15.9	15.5	14.1
Short-term leases	$ 1.3	$ 1.3	$ 2
Operating Lease, Weighted Average Remaining Lease Term	5 years 9 months 18 days	6 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	5.50%	5.20%

Supplemental Cash Flow Informat

Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases, Operating [Abstract]
Cash paid for amounts included in the measurement of lease liabilities included in operating cash flows:	$ 23,990	$ 26,059	$ 20,775
Right-of-use assets obtained in exchange for new lease obligations	$ 18,358	$ 17,987	$ 26,149

Schedule of Operating Lease, Ma

Schedule of Operating Lease, Maturity (Detail) $ in Thousands	Dec. 31, 2024 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2025	$ 21,872
2026	17,729
2027	13,991
2028	9,608
2029	7,332
Thereafter	20,760
Total lease payments	91,292
Less imputed interest	(14,671)
Total lease liabilities	$ 76,621

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		12 Months Ended
	Dec. 12, 2016	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 27, 2024	May 16, 2024	Oct. 05, 2022	May 01, 2020
Debt Instrument
Repurchase of common stock		$ 198,574,000	$ 397,241,000	$ 752,082,000
Stock issued during period, share		10
Line of Credit Facility, Maximum Borrowing Capacity							$ 750,000,000	$ 400,000,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		$ 200,000,000
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.
Percentage of issued and outstanding shares acquired					10%
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)		$ 970,761,000	$ 706,514,000
Warrant [Member]
Debt Instrument
Warrant expired		14.7
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	$ 460,000,000
Debt instrument, interest rate, stated percentage	1.25%
Debt instrument, net proceeds after issuance costs	$ 450,800,000
Payment for net cost of convertible note hedges net of warrant proceeds	33,000,000
Repurchase of common stock	$ 50,100,000
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		1.3
Strike price per share of warrant		$ 39.35
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%
Credit Agreement
Debt Instrument
Borrowed amount		$ 0				$ 185,000,000
Percentage of issued and outstanding shares acquired						10%

Interest Expense on Teradyne's

Interest Expense on Teradyne's Senior Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Contractual interest expense on the coupon	$ 0	$ 312
Amortization of the issuance fees recognized as interest expense	0	113
Total interest expense on the convertible debt	$ 0	$ 425

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,525,897	$ 2,451,294	$ 2,562,444
Other comprehensive income (loss)	(54,242)	22,890	(43,920)
Balance	2,819,294	2,525,897	2,451,294
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	(52,847)	17,407
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive income (loss)	(52,847)	17,407
Balance	(75,289)	(22,442)	(39,849)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(6,194)	(8,661)
Other comprehensive (loss) gain before reclassifications, net of tax	(1,699)	2,423
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	86	44
Other comprehensive income (loss)	(1,613)	2,467
Balance	(7,807)	(6,194)	(8,661)
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	2,100	5,464
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1,875)	(2,441)
Other comprehensive income (loss)	225	3,023
Balance	731	506	(2,517)
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	(7)	(7)	(7)
Other comprehensive income (loss)	(7)	(7)
Balance	1,145	1,152	1,159
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(26,978)	(49,868)	(5,948)
Other comprehensive (loss) gain before reclassifications, net of tax	(52,446)	25,294
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1,796)	(2,404)	294
Other comprehensive income (loss)	(54,242)	22,890	(43,920)
Balance	$ (81,220)	$ (26,978)	$ (49,868)

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (505)	$ (676)	$ 23
Foreign currency translation adjustments, tax	0	0	0
Unrealized Gains (Losses) on Marketable Securities, tax	(2,174)	(1,728)	(2,308)
Unrealized (Losses) Gains on Cash Flow Hedges	209	143	(708)
Retirement plans prior service benefit, tax	(1,134)	(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	(470)	568
Amounts reclassified from accumulated other comprehensive income (loss), tax	24	12	25
Other comprehensive income (loss), tax	(446)	580
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	593	1,537
Amounts reclassified from accumulated other comprehensive income (loss), tax	(527)	(686)
Other comprehensive income (loss), tax	66	851
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	(2)	(2)	$ (2)
Other comprehensive income (loss), tax	$ (2)	$ (2)

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	$ (86)	$ (44)	$ (301)
Unrealized (losses) gains, net	1,875	2,441	0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	(86)	(44)	(301)
Reclassifications, net of tax	(86)	(44)
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	7	7	7
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	$ 1,796	$ 2,404	$ (294)

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 505	$ 676	$ (23)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	527	686	0
Unrealized (Losses) Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	(24)	(12)	(25)
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 2	$ 2	$ 2

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment Loss	$ 0	$ 0
Acquired intangible assets amortization	$ 18,764	$ 18,999	$ 19,333

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 1,178,218	$ 1,165,761	$ 1,157,933
Accumulated impairment losses	(762,566)	(762,566)	(762,566)
Foreign currency translation adjustment	(20,285)	12,457
Total Goodwill	415,652	403,195	395,367
Robotics
Goodwill [Line Items]
Goodwill	395,463	383,166	375,298
Accumulated impairment losses	0	0	0
Foreign currency translation adjustment	(20,165)	12,297
Total Goodwill	395,463	383,166	375,298
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,237	262,077	262,117
Accumulated impairment losses	(260,540)	(260,540)	(260,540)
Foreign currency translation adjustment	(120)	160
Total Goodwill	1,697	1,537	1,577
All Other
Goodwill [Line Items]
Goodwill	520,518	520,518	520,518
Accumulated impairment losses	(502,026)	(502,026)	(502,026)
Foreign currency translation adjustment	0	0
Total Goodwill	$ 18,492	$ 18,492	$ 18,492

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 378,822	$ 378,822
Accumulated Amortization	(355,815)	(337,062)
Foreign Currency Translation Adjustment	(7,080)	(6,356)
Net Carrying Amount	15,927	35,404
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	267,706	267,706
Accumulated Amortization	(255,448)	(243,191)
Foreign Currency Translation Adjustment	(5,820)	(5,343)
Net Carrying Amount	6,438	19,172
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	52,109	52,109
Accumulated Amortization	(49,562)	(47,850)
Foreign Currency Translation Adjustment	204	232
Net Carrying Amount	2,751	4,491
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	59,007	59,007
Accumulated Amortization	(50,805)	(46,021)
Foreign Currency Translation Adjustment	(1,464)	(1,245)
Net Carrying Amount	$ 6,738	$ 11,741

Schedule of Amortizable Intan_2

Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of intangible assets	$ 9.3
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]	Intangible Assets, Net (Excluding Goodwill)

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Dec. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2025	$ 11,125
2026	2,325
2027	1,108
2028	1,027
2029	342
Thereafter	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Mar. 08, 2021	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments			$ 419.8
Purchase commitments less than one year			409.6
Product warranty accrual			13	$ 15.7
Revenue deferrals related to extended warranties			$ 41.6	$ 34.9
Auto Guide Llc [Member] | Dispute In Respect Of Contingent Consideration [Member]
Purchase Commitment, Excluding Long-term Commitment
Legal claims, damage sought by party	$ 106.9
Litigation Settlement, Amount settled between parties		$ 26.7

Computation of Basic and Dilute

Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income Loss Per Common Share
Net Income (Loss)		$ 542,372	$ 448,752	$ 715,501
Weighted average common shares-basic		159,083	154,310	158,434
Convertible note hedge warrant shares	[1]	3,563	8,897	8,806
Incremental shares from assumed conversion of convertible notes	[2]	0	633	1,763
Employee stock purchase rights		6	7	22
Dilutive potential common shares		4,231	9,994	11,300
Weighted average common shares-diluted		163,314	164,304	169,734
Net income per common share-basic		$ 3.41	$ 2.91	$ 4.52
Net income per common share-diluted		$ 3.32	$ 2.73	$ 4.22
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		651	423	657
Employee Stock Option [Member]
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		11	34	52
[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 the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Employee Stock Option [Member]
Net Income Loss Per Common Share
Exercise of stock options	0.1	0.1
Restricted Stock Units (RSUs) [Member]
Net Income Loss Per Common Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.1	0.1

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) $ in Millions		12 Months Ended
	Mar. 25, 2022 USD ($)	Dec. 31, 2024 USD ($) HeadCount	Dec. 31, 2023 USD ($) HeadCount	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve
Number of severance charges related to headcount reductions | HeadCount		98	215
Severance benefit and charges		$ 5.2	$ 14.7	$ 2.9
Contract termination charge		1.3	1.5
Increase in environmental liability others			1.1
Acquisition and divestiture expenses		$ 3.6
Increase Decrease in environmental and legal liabilities				2.7
Settled Litigation [Member]
Restructuring Cost and Reserve
Legal settlement charges				14.7
Gains on sale of asset				$ 3.4
Technoprobe [Member]
Restructuring Cost and Reserve
Acquisition and divestiture expenses			$ 3.1
TER Corporate And Eliminations | TER Dispute In Respect Of Contingent Consideration [Member]
Restructuring Cost and Reserve
Litigation Settlement, Amount settled between parties	$ 26.7

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) RetireeParticipants	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure
Fair value of pension plans assets totaled	$ 83,400
UNITED STATES
Defined Benefit Plan Disclosure
Acturial gains (losses) on benefit obligations	6,014	$ (3,229)
Accumulated benefit obligation for defined benefit pension plans	$ 109,000	$ 142,200
Percentage of expected return on plan assets assumption	4.70%	4.80%	2%
Discount rate utilized to determine future pension obligations	5.40%	4.70%
Fair value of pension plans assets totaled	$ 81,417	$ 112,617	$ 111,760
Contribution to defined benefit pension plans	3,065	3,051
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Acturial gains (losses) on benefit obligations	1,972	(2,738)
Accumulated benefit obligation for defined benefit pension plans	$ 29,100	$ 32,600
Percentage of expected return on plan assets assumption	2.50%	1.80%	4%
Discount rate utilized to determine future pension obligations	3.30%	3%
Fair value of pension plans assets totaled	$ 1,988	$ 1,929	$ 2,087
Contribution to defined benefit pension plans	1,024	$ 1,028
Group Annuity Contract | U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure
Defined Benefit Plan, decrease in benefit obligation	23,400
Acturial gains (losses) on benefit obligations	$ 8,000
Retiree participants transferred to accrued pension obligation | RetireeParticipants	132
Reduction in pension benefit obligation and pension assets	$ 23,400
Settlement expense	$ 400
United States Plans
Defined Benefit Plan Disclosure
Percentage of expected return on plan assets assumption	4.80%
Discount rate utilized to determine future pension obligations	5.40%	4.70%
Fair value of pension plans assets totaled	$ 81,400
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	3,100	$ 3,100
Contribution to defined benefit pension plans in 2018	7,400		3,300
Contribution to defined benefit pension plans in One to Three Years	7,400
Contribution to defined benefit pension plans thereafter	16,800
Non-United States Subsidiaries
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	1,000	1,000
Contribution to defined benefit pension plans in 2018	2,500		$ 1,100
Contribution to defined benefit pension plans in One to Three Years	2,400
Contribution to defined benefit pension plans thereafter	7,800
Taiwan Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Fair value of pension plans assets totaled	2,000
German Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, decrease in benefit obligation	2,000	1,000
Acturial gains (losses) on benefit obligations		$ 6,000
U.S. Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans in 2018	900
Contribution to defined benefit pension plans in One to Three Years	1,300
Contribution to defined benefit pension plans thereafter	1,700
Contribution to defined benefit pension plans	$ 900

Schedule of Defined Benefit Pen

Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Ending Balance	$ 83,400
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	144,187	$ 143,814
Service cost	881	1,063	$ 1,588
Interest cost	6,292	6,888	4,886
Actuarial (gain) loss	(6,014)	3,229
Benefits paid	(11,658)	(10,807)
Retiree annuity purchase	(23,386)
Liability (gain) loss due to settlement	394	0
Non-U.S. currency movement	0	0
Projected benefit obligation, End of year	110,696	144,187	143,814
Beginning Balance	112,617	111,760
Actual return on plan assets	779	8,613
Company contributions	3,065	3,051
Benefits paid	(11,658)	(10,807)
Retiree annuity purchase	(23,386)
Settlements gain	0	0
Non-U.S. currency movement	0	0
Ending Balance	81,417	112,617	111,760
Funded status	(29,279)	(31,570)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	33,984	29,935
Service cost	446	446	784
Interest cost	953	1,057	482
Actuarial (gain) loss	(1,972)	2,738
Benefits paid	(955)	(947)
Liability (gain) loss due to settlement	(195)	(254)
Non-U.S. currency movement	(1,988)	1,009
Projected benefit obligation, End of year	30,273	33,984	29,935
Beginning Balance	1,929	2,087
Actual return on plan assets	77	43
Company contributions	1,024	1,028
Benefits paid	(955)	(947)
Settlements gain	(195)	(254)
Non-U.S. currency movement	108	(28)
Ending Balance	1,988	1,929	2,087
Funded status	(28,285)	(32,055)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year	6,933	5,345
Service cost	37	34	64
Interest cost	289	299	177
Actuarial (gain) loss	(445)	155
Benefits paid	(1,685)	(1,413)
Special termination benefits	462	2,513
Projected benefit obligation, End of year	5,591	6,933	5,345
Beginning Balance	0	0
Company contributions	1,685	1,413
Benefits paid	(1,685)	(1,413)
Ending Balance	0	0	$ 0
Funded status	$ (5,591)	$ (6,933)

Schedule of Amounts Recorded wi

Schedule of Amounts Recorded within Statements of Financial Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Retirement plans assets	$ 11,994	$ 11,504
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Retirement plans assets	11,994	11,504
Accrued employees' compensation and withholdings	(3,263)	(3,110)
Retirement plans liabilities	(38,010)	(39,964)
Funded status	(29,279)	(31,570)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accrued employees' compensation and withholdings	(969)	(1,255)
Retirement plans liabilities	(27,316)	(30,800)
Funded status	(28,285)	(32,055)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued employees' compensation and withholdings	(938)	(1,508)
Retirement plans liabilities	(4,653)	(5,425)
Funded status	$ (5,591)	$ (6,933)

Schedule of Amounts Recognized

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (loss) (Detail) - Postretirement Benefit Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure
Prior service cost, before tax	$ (14)	$ (23)
Deferred taxes	(1,693)	(1,691)
Total recognized in other comprehensive income (loss), net of tax	$ (1,707)	$ (1,714)

Schedule of Pension Plans with

Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 41.3	$ 43.1
Accumulated benefit obligation	41.1	42.6
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation	30.3	34
Accumulated benefit obligation	29.1	32.5
Fair value of plan assets	$ 2	$ 1.9

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement Cost (Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Net actuarial (gain) loss	$ (4,355)	$ 2,703	$ (25,584)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Amortization of Intangible Assets
UNITED STATES
Defined Benefit Plan Disclosure
Service cost	881	$ 1,063	1,588
Interest cost	6,292	6,888	4,886
Expected return on plan assets	(4,865)	(5,194)	(2,927)
Net actuarial (gain) loss	(1,929)	18	(11,170)
Settlement (gain) loss	394	(209)
Total net periodic pension cost (income)	773	2,566	(7,623)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	446	446	784
Interest cost	953	1,057	482
Expected return on plan assets	(77)	(45)	(75)
Net actuarial (gain) loss	(1,948)	2,735	(13,259)
Settlement (gain) loss	(24)	5
Total net periodic pension cost (income)	(650)	4,198	(12,068)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	37	34	64
Interest cost	289	299	177
Amortization of prior service cost	(9)	(9)	(9)
Net actuarial (gain) loss	(445)	155	(1,155)
Special termination benefits	462	2,513
Total net periodic pension cost (income)	334	2,992	(923)
Prior service cost	9	9	9
Total recognized in other comprehensive income	9	9	9
Total recognized in net periodic pension cost (income) and other comprehensive income	$ 343	$ 3,001	$ (914)

Schedule of Weighted Average -

Schedule of Weighted Average - Assumptions to Determine Net Periodic Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
UNITED STATES
Defined Benefit Plan Disclosure
Discount rate	4.70%	3.50%	2.50%
Expected return on plan assets	4.70%	4.80%	2%
Salary progression rate	2.50%	2.40%	2.40%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Discount rate	3%	3.50%	1.10%
Expected return on plan assets	2.50%	1.80%	4%
Salary progression rate	2.40%	2.10%	2.20%
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Discount rate	4.70%	5%	2.60%
Initial health care cost trend rate	7.70%	7.20%	7.30%
Ultimate health care cost trend rate	4.50%	4.50%	4.50%
Year in which ultimate health care cost trend rate is reached	2033	2032	2029

Schedule of Weighted Average As

Schedule of Weighted Average Assumptions to Determine Pension Obligations (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Discount rate	5.40%	4.70%	5%
Initial health care trend	8.60%	7.70%	7.20%
Ultimate health care trend	4.50%	4.50%	4.50%
Medical cost trend rate decrease to ultimate rate in year	2035	2033	2032
UNITED STATES
Defined Benefit Plan Disclosure
Discount rate	5.40%	4.70%
Salary progression rate	2.50%	2.50%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Discount rate	3.30%	3%
Salary progression rate	2.40%	2.40%

Schedule of Weighted Average Pe

Schedule of Weighted Average Pension Assets Allocations by Category (Detail)	Dec. 31, 2024	Dec. 31, 2023
UNITED STATES
Defined Benefit Plan Disclosure
Total	100%	100%
UNITED STATES | Fixed income securities
Defined Benefit Plan Disclosure
Total	94%	94%
UNITED STATES | Equity securities
Defined Benefit Plan Disclosure
Total	5%	5%
UNITED STATES | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	1%	1%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	100%	100%
Foreign Pension Plans, Defined Benefit | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	100%	100%

Schedule of Target Assets Alloc

Schedule of Target Assets Allocation (Detail)	Dec. 31, 2024
Bloomberg U.S. Corporate A or Better Index, 20+ Year Index | U.S. corporate fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	66%
Bloomberg U.S. Corporate A or Better Index, 5- 20 Year Index | U.S. corporate fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	9%
Bloomberg U.S. 3 - 10 Year Treasury Bond Index | U.S. government fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	12%
Bloomberg U.S. Government Bond Index | U.S. government fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	2%
MSCI World Index | Global equity
Defined Benefit Plan Disclosure
Target assets allocation percentage	5%
ICE BofA BB-B U.S. High Yield Constrained Index | High yield fixed income
Defined Benefit Plan Disclosure
Target assets allocation percentage	5%
ICE BofA 3-Month Treasury Bill Index | Cash
Defined Benefit Plan Disclosure
Target assets allocation percentage	1%

Schedule of Target Assets All_2

Schedule of Target Assets Allocation (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2024
Bloomberg U.S. Corporate A or Better Index, 20+ Year Index | U.S. corporate fixed income
Defined Benefit Plan Disclosure [Line Items]
Policy index period description	20+ Year
Bloomberg U.S. 3 - 10 Year Treasury Bond Index | U.S. government fixed income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Policy index duration period	3 years
Bloomberg U.S. 3 - 10 Year Treasury Bond Index | U.S. government fixed income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Policy index duration period	10 years
ICE BofA 3-Month Treasury Bill Index | Cash
Defined Benefit Plan Disclosure [Line Items]
Policy index duration period	3 months

Schedule of Fair Value of Pensi

Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Total	$ 83,400
UNITED STATES
Defined Benefit Plan Disclosure
Total	81,417	$ 112,617	$ 111,760
UNITED STATES | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Defined Benefit Plan Disclosure
Total	818	1,138
UNITED STATES | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	80,599	111,479
UNITED STATES | Corporate Debt Securities
Defined Benefit Plan Disclosure
Total	65,160	89,971
UNITED STATES | Corporate Debt Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	65,160	89,971
UNITED STATES | US Government Debt Securities
Defined Benefit Plan Disclosure
Total	11,414	15,817
UNITED STATES | US Government Debt Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	11,414	15,817
UNITED STATES | Global equity Securities
Defined Benefit Plan Disclosure
Total	4,025	5,691
UNITED STATES | Global equity Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	4,025	5,691
UNITED STATES | Cash and Cash Equivalents
Defined Benefit Plan Disclosure
Total	818	1,138
UNITED STATES | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Defined Benefit Plan Disclosure
Total	818	1,138
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	1,988	1,929	$ 2,087
Foreign Pension Plans, Defined Benefit | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	1,988	1,929
Foreign Pension Plans, Defined Benefit | Other
Defined Benefit Plan Disclosure
Total	1,988	1,929
Foreign Pension Plans, Defined Benefit | Other | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure
Total	$ 1,988	$ 1,929

Schedule of Expected Future Ben

Schedule of Expected Future Benefit Payments (Detail) $ in Thousands	Dec. 31, 2024 USD ($)
UNITED STATES
Defined Benefit Plan Disclosure
2025	$ 9,202
2026	8,152
2027	9,043
2028	9,135
2029	9,040
2030-2034	42,009
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
2025	1,077
2026	1,208
2027	1,245
2028	1,253
2029	1,422
2030-2034	8,561
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
2025	938
2026	671
2027	585
2028	510
2029	414
2030-2034	$ 1,719

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended						12 Months Ended
	Jan. 31, 2025	Jul. 31, 2024	Jan. 31, 2024	Jul. 31, 2023	Jan. 31, 2023	Jan. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense.							$ 60,122,000	$ 57,682,000	$ 48,228,000
Total shareholder return performance measurement period							3 years
Restricted stock unit awards granted							703,000	728,000	660,000
Weighted average grant date fair value of restricted stock units granted							$ 97.06	$ 105.05	$ 108.74
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.
Stock price							$ 95.14	$ 104.15	$ 112.12
Tax benefit from compensation expense							$ 10,472,000	$ 10,397,000	$ 11,493,000
Total unrecognized expense related to non-vested restricted stock unit awards and stock options							$ 82,600,000
Unrecognized expense related to non-vested restricted stock unit awards and stock options expected to be recognized over weighted average period, in years							2 years 6 months
Maximum percent of shares allowed to purchase							10%
Fair market value							$ 25,000
Maximum number of shares allowed to purchase							6,000
Percentage of common stock price paid							85%
Common stock issued to employees		100,000	200,000	200,000	200,000	200,000
Value of common stock issued to employees per share		$ 126.05		$ 94.64			$ 107.04	$ 92.25	$ 74.25	$ 76.12
Number of shares available for grant							3,665,000	4,353,000	5,062,000		5,713,000
Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense.							$ 5,900,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Cash received from employees, employee stock options exercises							6,600,000	$ 2,200,000	$ 900,000
Tax benefit from compensation expense							$ 200,000	$ 200,000	$ 100,000
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	$ 0.44
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							703,000	728,000	660,000
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments							4 years
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							100,000	100,000	100,000
Weighted average grant date fair value of restricted stock units granted							$ 102.51	$ 139.04	$ 101.06
Stock price							95.83	104.12	112.12
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	$ 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
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant							3,200,000
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							100,000	100,000	100,000
Weighted average grant date fair value of restricted stock units granted							$ 94.51	$ 102.91	$ 110.84
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							600,000	500,000	400,000
Weighted average grant date fair value of restricted stock units granted							$ 96.72	$ 102.45	$ 109.42
Service-Based Restricted Stock Units | Non Employees
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of restricted stock units granted							$ 121.29	$ 90.5	$ 105.93
Service-Based Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							100,000	100,000	100,000
TERService Based Stock Options | Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted							100,000	100,000	100,000
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	$ 41.23	$ 39.01
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Common stock issued to employees	100,000

Schedule of Estimated Fair Valu

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions (Detail) - TSR Performance-Based Restricted Stock Units	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	3.90%	4%	1.40%
Expected historical volatility	42.40%	49.70%	47.10%
Dividend yield	0.50%	0.40%	0.40%
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	15.60%	24.10%	22.70%

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]	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	4 years	4 years	4 years
Risk-free interest rate	4%	3.80%	1.60%
Volatility-historical	46.30%	46.60%	43.70%
Dividend yield	0.50%	0.40%	0.40%

Schedule of Stock Compensation

Schedule of Stock Compensation Plan Activity (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Awarded	703	728	660
Forfeited	(62)	(58)	(51)
Outstanding at January 1	171	188	171
Granted	49	41	42
Exercised	(77)	(56)	(25)
Forfeited	(2)	(2)
Outstanding at December 31	141	171	188
Vested and expected to vest at December 31	141	171	188
Exercisable at December 31	34	68	69
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Non-vested at January 1	1,378	1,317	1,417
Awarded	703	728	660
Vested	(492)	(609)	(709)
Forfeited	(62)	(58)	(51)
Non-vested at December 31	1,527	1,378	1,317

Schedule of Share Based Compens

Schedule of Share Based Compensation Total Shares Available (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Available for grant at January 1	4,353	5,062	5,713
Options granted	(49)	(41)	(42)
Options forfeited	2	2
Restricted stock units awarded	(703)	(728)	(660)
Restricted stock units forfeited	62	58	51
Available for grant at December 31	3,665	4,353	5,062

Schedule of Weighted-Average Re

Schedule of Weighted-Average Restricted Stock Unit Award Fair Value (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Non-vested at January 1	$ 101	$ 88.71	$ 67.97
Awarded	97.06	105.05	108.74
Vested	93.12	75.55	54.27
Forfeited	103.81	102.12	85.71
Non-vested at December 31	$ 101.17	$ 101	$ 88.71

Schedule of Restricted Stock Un

Schedule of Restricted Stock Unit Awards Aggregate Intrinsic Value (Detail) - Restricted Stock Units - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Vested	$ 54,235	$ 62,001	$ 95,408
Outstanding	192,324	149,504	115,087
Expected to vest	$ 177,878	$ 135,238	$ 108,666

Schedule of Restricted Stock _2

Schedule of Restricted Stock Units Weighted Average Remaining Contractual Terms (Detail) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding	1 year 2 months 8 days	1 year 1 month 17 days	11 months 26 days
Expected to vest	1 year 2 months 8 days	1 year 1 month 17 days	11 months 26 days

Schedule of Weighted Average St

Schedule of Weighted Average Stock Options Exercise Price (Detail)	12 Months Ended
	Dec. 31, 2024 $ / shares
Share-Based Payment Arrangement [Abstract]
Outstanding at January 1	$ 94.85
Options granted	95.14
Options exercised	86.02
Options forfeited	112.58
Options cancelled	112.8
Outstanding at December 31	99.51
Exercisable at December 31	$ 91.27

Schedule of Stock Option Aggreg

Schedule of Stock Option Aggregated Intrinsic Value Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Exercised	$ 2,783	$ 3,901	$ 2,030
Outstanding	3,709	2,647	3,963
Expected to vest	2,531	696	1,583
Vested and exercisable	$ 1,178	$ 1,950	$ 2,380

Schedule of Stock Options Weigh

Schedule of Stock Options Weighted Average Remaining Contractual Terms (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Outstanding	4 years 9 months 18 days	4 years 4 months 24 days	4 years 2 months 12 days
Expected to vest	5 years 2 months 12 days	5 years 1 month 6 days	4 years 9 months 18 days
Vested and exercisable	3 years 3 months 18 days	3 years 4 months 24 days	3 years 1 month 6 days

Stock Based Compensation (Detai

Stock Based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 60,122	$ 57,682	$ 48,228
Income tax benefit	(10,472)	(10,397)	(11,493)
Total stock-based compensation expense after income taxes	49,650	47,285	36,735
Cost Of Revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	4,922	4,208	4,050
Engineering And Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	12,531	10,659	9,992
Selling and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 42,669	$ 42,815	$ 34,186

Savings Plan - Additional Infor

Savings Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Savings Plan [Line Items]
Savings plan maximum percentage of employees contribution allowable	20%
Percentage of employer contributions vested per year	25%
Maximum employment period considered for vesting of employers' contribution, in years	4 years
Liability, Retirement and Postemployment Benefits	$ 63.4	$ 55.9
U.S. Qualified Pension Plan
Savings Plan [Line Items]
Maximum percentage of matching contributions made by the employer	100%	100%	100%
Percentage of employer match on employee contribution	4%	4%	4%
Savings Plan
Savings Plan [Line Items]
Amounts charged to statements of operations	$ 29.7	$ 30.5	$ 30.1

Schedule of Income (Loss) Befor

Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S.		$ 231,346	$ 307,997	$ 385,968
Non-U.S.		377,740	217,575	454,417
Income before income taxes	[1]	$ 609,086	$ 525,572	$ 840,385
[1] Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, acquired intangible amortization, gain on the sale of a business, pension and postretirement plan actuarial gains (losses), legal and environmental fees, contingent consideration adjustments, acquisition and divestiture related expenses, contract termination settlement charge, and an expense for the modification of Teradyne's former chief executive officer's outstanding equity awards.

Schedule of Provision (Benefit)

Schedule of Provision (Benefit) for Income Taxes from Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Current, U.S. Federal	$ 40,296	$ 58,063	$ 86,692
Current, Non-U.S.	62,851	54,037	74,204
Current, State	2,716	2,362	2,681
Current, Total	105,863	114,462	163,577
Deferred, U.S. Federal	(33,195)	(27,459)	(36,739)
Deferred, Non-U.S.	(9,003)	(8,584)	1,232
Deferred, State	(4,162)	(1,599)	(3,186)
Deferred, Total	(46,360)	(37,642)	(38,693)
Total provision for income taxes	$ 59,503	$ 76,820	$ 124,884

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 16, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2017	Dec. 31, 2021
Income Taxes [Line Items]
Total (benefit) provision for income taxes		$ 59,503	$ 76,820	$ 124,884
Effective tax rate		9.80%	14.60%	14.90%
Tax savings due to the tax holiday		$ 17,100	$ 1,400	$ 16,000
Tax savings due to the tax holiday, per share		$ 0.1	$ 0.01	$ 0.09
Tax holiday expiration date		December 31, 2025
Valuation allowance includes net deferred tax assets		$ 117,254	$ 109,251
Tax credit carryforwards, approximately					$ 158,200
Tax credits carryforwards		121,635	112,571
Reduction in unrecognized tax benefits		7,663	18,606	$ 15,608		$ 14,465
Unrecognized tax benefits, if recognized would impact effective tax rate		2,300
Unrecognized tax benefits, if recognized would impact deferred taxes		5,400
Decrease in unrecognised tax benefit due to lapse in statute of limitation		8,247	0	212
Reasonably possible decrease of unrecognized tax benefit		700
Accrued interest and penalties		300	1,300
Interest and penalties related to income tax, expense (benefit)		(1,000)	$ 900	$ 100
Expected future payments related transition tax in 2024		19,700
Expense related to remeasurement of deferred tax assets and liabilities		44,300
Expected future payments related transition tax in one to three years		24,600
Percentage of alternative minimum tax	15%
Minimum effective tax rate	15%
United States
Income Taxes [Line Items]
Tax credits carryforwards, business					$ 4,300
Tax credit carryforward, expiration date					2028
State and Local Jurisdiction
Income Taxes [Line Items]
Tax credits carryforwards					$ 153,900
Reduction in unrecognized tax benefits		$ 7,700
State and Local Jurisdiction | Earliest Tax Year
Income Taxes [Line Items]
Tax credit carryforward, expiration date					2025
State and Local Jurisdiction | Latest Tax Year
Income Taxes [Line Items]
Tax credit carryforward, expiration date					2043
State and Local Jurisdiction | Do Not Expire
Income Taxes [Line Items]
Tax credits carryforwards					$ 81,500

Schedule of Reconciliation of E

Schedule of Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S. statutory federal tax rate	21%	21%	21%
U.S. global intangible low-taxed income	1.20%	0.80%	1.20%
Non-deductible officers' compensation	0.30%	1.10%	1.30%
Equity compensation	(0.00%)	(0.40%)	(1.10%)
U.S. foreign derived intangible income	(3.10%)	(3.90%)	(3.10%)
U.S. research and development credit	(3.00%)	(4.20%)	(1.80%)
Foreign taxes	(2.70%)	2.50%	(1.90%)
Uncertain tax positions	(1.90%)	0.70%	0.10%
Foreign tax credits	(1.30%)	(3.30%)	(1.00%)
State income taxes, net of federal tax benefit	(0.10%)	0.10%	(0.10%)
Other, net	(0.60%)	0.20%	0.30%
Effective tax rate, Total	9.80%	14.60%	14.90%

Schedule of Components of Defer

Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Tax credits	$ 121,635	$ 112,571
Research and development	116,746	82,571
Pension liabilities	25,202	24,997
Accruals	23,946	25,644
Inventory valuations	18,688	19,289
Lease liability	17,828	21,167
Net operating loss carryforwards	16,894	5,737
Deferred revenue	14,562	13,807
Equity compensation	8,901	7,179
Vacation accrual	6,847	6,096
Intangible assets	4,720	2,323
Investment impairment	3,328	3,292
Marketable securities	0	128
Other	322	953
Gross deferred tax assets	379,619	325,754
Less: valuation allowance	(117,254)	(109,251)
Total deferred tax assets	262,365	216,503
Depreciation	(18,788)	(16,681)
Right of use assets	(16,257)	(19,016)
Contingent consideration	(5,270)	(5,214)
Marketable securities	(650)	0
Total deferred tax liabilities	(40,965)	(40,911)
Net deferred assets	$ 221,400	$ 175,592

Summary of Operating Loss Carry

Summary of Operating Loss Carryforwards (Detail) $ in Thousands	Dec. 31, 2024 USD ($)
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	$ 235
Foreign Operating Loss Carryforwards	16,658
2025
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	4
2026
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	0
2027
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	0
2028
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	10
Foreign Operating Loss Carryforwards	80
2029
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	49
Foreign Operating Loss Carryforwards	465
2030-2034
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	62
Foreign Operating Loss Carryforwards	34
2035-2039
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	37
Beyond 2039
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	19
Non-Expiring
Operating Loss Carryforwards [Line Items]
U.S. Federal Operating Loss Carryforwards	54
Foreign Operating Loss Carryforwards	$ 16,079

Schedule of Unrecognized Tax Be

Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Beginning balance, as of January 1	$ 18,606	$ 15,608	$ 14,465
Tax positions for current year, Additions		0	1,398
Tax positions for prior years, Additions		3,024	13
Tax positions for prior years, Reductions	(2,696)	(26)	(56)
Expiration of statutes, Reductions	(8,247)	0	(212)
Ending balance as of December 31	$ 7,663	$ 18,606	$ 15,608

Segment, Geographic and Signi_3

Segment, Geographic and Significant Customer Information - Additional Information (Detail) - Segment	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating segments	2
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	srt:ChiefExecutiveOfficerMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM uses business segment income (loss) before income taxes predominantly in the annual budgeting and forecasting process. The CODM also uses this measure when making decisions about the allocation of operating and capital resources to each segment. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies.”
Qualcomm | Consolidated Revenue | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage			11%
Semiconductor Test | Customer 1 | Consolidated Revenue | Revenue from Rights Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.50%	10%

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	[1],[2]	$ 2,819,880	$ 2,676,298	$ 3,155,045
Cost of revenues		1,141,833	1,116,443	1,257,877
Engineering and development		409,476	370,593	381,077
Selling and marketing		351,028	319,356	309,992
General and administrative		165,562	159,373	154,174
Other segment items	[3],[4]	142,895	184,961	211,540
Income (loss) before taxes	[4]	609,086	525,572	840,385
Total assets	[5]	3,708,714	3,486,824	3,501,252
Property additions		198,095	159,642	163,249
Depreciation and amortization expense		119,741	110,886	110,675
All Other
Segment Reporting Information [Line Items]
Revenues	[1]	331,112	343,927	401,053
Operating Segments
Segment Reporting Information [Line Items]
Revenues		2,488,768	2,332,371	2,753,741
Cost of revenues		1,021,433	998,403	1,132,355
Engineering and development		362,920	326,055	336,966
Selling and marketing		300,711	269,225	258,104
General and administrative		144,280	134,269	133,389
Other segment items	[3],[4]	178,808	160,167	165,249
Income (loss) before taxes	[4]	480,616	444,252	727,678
Total assets	[5]	2,029,236	2,126,165	2,101,403
Property additions		190,405	154,403	152,610
Depreciation and amortization expense		113,405	104,095	102,261
Operating Segments | Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		2,123,920	1,957,188	2,350,603
Cost of revenues		866,353	846,570	970,972
Engineering and development		295,614	257,387	272,296
Selling and marketing		187,384	162,068	156,520
General and administrative		89,952	77,786	75,544
Other segment items	[3],[4]	126,449	114,873	131,464
Income (loss) before taxes	[4]	558,168	498,504	743,807
Total assets	[5]	1,287,219	1,388,842	1,435,766
Property additions		168,130	113,664	126,899
Depreciation and amortization expense		85,737	78,568	76,922
Operating Segments | Robotics
Segment Reporting Information [Line Items]
Revenues		364,848	375,183	403,138
Cost of revenues		155,080	151,833	161,383
Engineering and development		67,306	68,668	64,670
Selling and marketing		113,327	107,157	101,584
General and administrative		54,328	56,483	57,845
Other segment items	[3],[4]	52,359	45,294	33,785
Income (loss) before taxes	[4]	(77,552)	(54,252)	(16,129)
Total assets	[5]	742,017	737,323	665,638
Property additions		22,275	40,739	25,711
Depreciation and amortization expense		27,668	25,527	25,339
Operating Segments | All Other
Segment Reporting Information [Line Items]
Revenues		331,112	343,927	401,053
Cost of revenues		120,400	118,040	125,522
Engineering and development		46,556	44,538	44,111
Selling and marketing		50,317	50,131	51,888
General and administrative		21,282	25,104	20,785
Other segment items	[3],[4]	26,833	26,657	34,587
Income (loss) before taxes	[4]	65,724	79,457	124,160
Total assets	[5]	213,749	191,055	207,079
Property additions		7,690	5,239	10,639
Depreciation and amortization expense		6,336	7,021	7,836
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		0	0	251
Cost of revenues		0	0	0
Engineering and development		0	0	0
Selling and marketing		0	0	0
General and administrative		0	0	0
Other segment items	[3],[4]	(62,746)	(1,863)	11,704
Income (loss) before taxes	[4]	62,746	1,863	(11,453)
Total assets	[5]	1,465,730	1,169,605	1,192,769
Property additions		0	0
Depreciation and amortization expense		$ 0	$ (230)	$ 578
[1] Includes $ 3.7 m illion, $ 5.2 million and $ 8.2 million in 2024, 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.” Revenues attributable to a country are based on location of customer site. For each reportable segment, the other segment items category includes equity and variable compensation, acquired intangible assets amortization, and restructuring and other charges. Included in Corporate and Eliminations are interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, acquired intangible amortization, gain on the sale of a business, pension and postretirement plan actuarial gains (losses), legal and environmental fees, contingent consideration adjustments, acquisition and divestiture related expenses, contract termination settlement charge, and an expense for the modification of Teradyne's former chief executive officer's outstanding equity awards. Total assets are attributable to each segment. In 2023, Semiconductor Test includes $ 34.8 million of total assets classified as assets held for sale. See Note E: "Dispositions" 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	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets held for sale	$ 0	$ 11,531
Semiconductor Test | Operating Segments
Segment Reporting Information [Line Items]
Assets held for sale	$ 34,800	$ 34,800	$ 34,800

Schedule of Revenues by Country

Schedule of Revenues by Country (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1],[2]	$ 2,819,880	$ 2,676,298	$ 3,155,045
KOREA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	695,669	394,690	544,816
TAIWAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	601,997	384,842	626,424
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	375,186	314,899	491,798
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	374,333	433,661	469,948
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	251,285	273,784	268,384
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	159,827	281,742	162,920
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	90,113	116,969	99,503
MALAYSIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	62,376	89,197	142,203
PHILIPPINES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	53,636	189,419	124,107
THAILAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	49,268	91,818	137,356
Rest Of The World
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	$ 106,190	$ 105,277	$ 87,586
[1] Includes $ 3.7 m illion, $ 5.2 million and $ 8.2 million in 2024, 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.” Revenues attributable to a country are based on location of customer site.

Schedule of Long-Lived Assets b

Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023	[1]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		$ 578,356	$ 530,440
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		328,733	322,445
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	[2]	$ 249,623	$ 207,995
[1] Includes $ 11.5 million of long-lived assets classified as assets held for sale. See Note E: "Dispositions" for additional information. As of December 31, 2024 and December 31, 2023, long-lived assets attributable to Denmark were $ 85.1 million and $ 78.1 million, respectively. Long-lived assets attributable to Singapore were $ 74.8 million as of December 31, 2024 .

Schedule of Long-Lived Assets_2

Schedule of Long-Lived Assets by Geographic Area (Parenthetical) (Detail) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		$ 578,356	$ 530,440	[1]
Assets held for sale		0	11,531
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		328,733	322,445	[1]
Assets held for sale			11,500
DENMARK
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		85,100	78,100
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		74,800
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	[2]	$ 249,623	207,995	[1]
Assets held for sale			$ 11,500
[1] Includes $ 11.5 million of long-lived assets classified as assets held for sale. See Note E: "Dispositions" for additional information. As of December 31, 2024 and December 31, 2023, long-lived assets attributable to Denmark were $ 85.1 million and $ 78.1 million, respectively. Long-lived assets attributable to Singapore were $ 74.8 million as of December 31, 2024 .

Stock Repurchase Program - Addi

Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended		24 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Jan. 31, 2023
Share Repurchase Program [Line Items]
Cumulative repurchases, shares	1.7	3.9	1.7
Cumulative repurchases, value	$ 199.4	$ 400.5	$ 199.4	$ 2,000
Common stock average price	$ 114.63	$ 102.47
January 2023 Repurchase Program [Member] | Common Stock [Member]
Share Repurchase Program [Line Items]
Cumulative repurchases, shares			5.6
Cumulative repurchases, value			$ 599.9
Common stock average price			$ 106.21

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Subsequent Event [Line Items]
Share-Based Payment Arrangement, Expense		$ 60,122	$ 57,682	$ 48,228
Subsequent Event
Subsequent Event [Line Items]
Cash Dividends payable, amount per share	$ 0.12
Subsequent Event | O 2025 Q1 Dividends
Subsequent Event [Line Items]
Cash Dividends payable, date to be paid	Mar. 14, 2025
Cash Dividends payable, record date	Feb. 14, 2025

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Credit Losses
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,988	$ 1,955	$ 2,012
Additions Charged to Cost and Expenses	149	301	500
Other	(36)	23	(6)
Deductions	(10)	291	551
Balance at End of Period	2,111	1,988	1,955
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	109,251	103,807	97,170
Additions Charged to Cost and Expenses	8,809	5,759	7,652
Other	(41)	59	21
Deductions	765	374	1,036
Balance at End of Period	$ 117,254	$ 109,251	$ 103,807