Teradyne (TER) 10-Q 5 May 23 2023 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Apr. 02, 2023	May 01, 2023
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Fiscal Year Focus	2023
Entity Central Index Key	0000097210
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Document Period End Date	Apr. 02, 2023
Entity Registrant Name	TERADYNE, INC.
Entity Filer Category	Large Accelerated Filer
Trading Symbol	TER
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity File Number	001-06462
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2272148
Entity Address, Address Line One	600 Riverpark Drive
Entity Address, City or Town	North Reading
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01864
City Area Code	978
Local Phone Number	370-2700
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		155,038,743

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 02, 2023		Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 649,208		$ 854,773
Marketable securities	92,895		39,612
Accounts receivable, less allowance for credit losses of $1,973 and $1,955 at April 2, 2023 and December 31, 2022, respectively	455,334		491,145
Inventories, net	352,058		325,019
Prepayments	549,114		532,962
Other current assets	13,367		14,404
Total current assets	2,111,976		2,257,915
Property, plant and equipment, net	432,381		418,683
Operating lease right-of-use assets, net	74,939		73,734
Marketable securities	116,938		110,777
Deferred tax assets	148,527		142,784
Retirement plans assets	11,650		11,761
Other assets	27,922		28,925
Acquired intangible assets, net	49,246		53,478
Goodwill	409,828		403,195
Total assets	3,383,407	[1]	3,501,252
Current liabilities:
Accounts payable	142,382		139,722
Accrued employees' compensation and withholdings	119,433		212,266
Deferred revenue and customer advances	119,355		148,285
Other accrued liabilities	114,739		112,271
Operating lease liabilities	19,985		18,594
Income taxes payable	77,089		65,010
Current debt	35,109		50,115
Total current liabilities	628,092		746,263
Retirement plans liabilities	121,303		116,005
Long-term deferred revenue and customer advances	41,797		45,131
Long-term other accrued liabilities	16,211		15,981
Deferred tax liabilities	2,325		3,267
Long-term operating lease liabilities	65,082		64,176
Long-term incomes taxes payable	59,135		59,135
Total liabilities	933,945		1,049,958
Commitments and contingencies (Note Q)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 155,445 and 155,759 shares issued and outstanding at April 2, 2023 and December 31, 2022, respectively	19,431		19,470
Additional paid-in capital	1,772,352		1,755,963
Accumulated other comprehensive loss	(36,466)		(49,868)
Retained earnings	694,145		725,729
Total shareholders' equity	2,449,462		2,451,294
Total liabilities and shareholders' equity	$ 3,383,407		$ 3,501,252
[1]Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Accounts receivable, less allowance for doubtful accounts	$ 1,973	$ 1,955
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	155,445	155,759
Common stock, shares outstanding	155,445	155,759

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 02, 2023	Apr. 03, 2022
Revenues:
Total revenues	[1]	$ 617,529	$ 755,370
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		261,109	300,437
Gross profit		356,420	454,933
Operating expenses:
Selling and administrative		150,955	140,185
Engineering and development		105,762	108,116
Acquired intangible assets amortization		4,802	5,063
Restructuring and other		2,037	15,714
Total operating expenses		263,556	269,078
Income from operations		92,864	185,855
Non-operating (income) expense:
Interest income		(5,258)	(703)
Interest expense		987	1,012
Other (income) expense, net		51	5,187
Income before income taxes	[2],[3]	97,084	180,359
Income tax provision		13,553	18,431
Net income		$ 83,531	$ 161,928
Net income per common share:
Basic		$ 0.54	$ 1
Diluted		$ 0.5	$ 0.92
Weighted average common shares—basic		155,904	162,048
Weighted average common shares—diluted		166,308	175,575
Product [Member]
Revenues:
Total revenues		$ 473,418	$ 625,875
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		198,665	243,016
Service [Member]
Revenues:
Total revenues		144,111	129,495
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 62,444	$ 57,421
[1]Includes $1.3 million and $2.3 million in 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”[2]Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, legal and environmental fees, severance charges, acquisition related charges and compensation and an expense for the modification of Teradyne’s former chief executive officer’s outstanding equity awards.[3]Included in income (loss) before taxes are charges related to restructuring and other, and inventory charges.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Net income	$ 83,531	$ 161,928
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0 and $0, respectively	9,309	(8,076)
Available-for-sale marketable securities:
Unrealized gains (losses) on marketable securities arising during period, net of tax of $503 and $(1,333), respectively	2,294	(5,388)
Less: Reclassification adjustment for losses (gains) included in net income, net of tax of $2 and $(18), respectively	5	(65)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	2,299	(5,453)
Cash flow hedges:
Unrealized gains arising during period, net of tax of $167, $0, respectively	596	0
Less: Reclassification adjustment for losses included in net income, net of tax of $338 and $0, respectively	1,200	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	1,796	0
Defined benefit post-retirement plan:
Amortization of prior service credit, net of tax of $0 and $0, respectively	(2)	(2)
Other comprehensive income (loss)	13,402	(13,531)
Comprehensive income	$ 96,933	$ 148,397

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Foreign currency translation adjustments, tax	$ 0	$ 0
Unrealized gains (losses) on marketable securities arising during period, net of tax	503	(1,333)
Reclassification adjustment for losses (gains) included in net income, net of tax	2	(18)
Amortization of prior service credit, net of tax	0	0
Cash flow hedges Unrealized gains	167	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 338	$ 0

CONDENSED CONSOLIDATED STATEM_4

CONDENSED 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 (Loss) Income	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	(14,574)	$ 70		(14,644)
Net issuance of common stock under stock-based plans (in shares)		552,000
Stock-based compensation expense	14,204			14,204
Repurchase of common stock	(211,466)	$ (219)				(211,247)
Repurchase of common stock (in shares)		(1,750,000)
Cash dividends	(17,908)					(17,908)
Settlements of convertible notes	(93)	$ 64		(157)
Settlements of convertible notes (in shares)		509,000
Exercise of convertible notes hedge call options	0	$ (64)		64
Exercise of convertible notes hedge call options (in shares)		(509,000)
Cumulative-effect of change in accounting principle related to convertible debt	(6,472)			(99,322)		92,850
Cumulative-effect of change in accounting principle related to convertible debt (in shares)			(1,512,000)
Net income	161,928					161,928
Other comprehensive income/loss	(13,531)				(13,531)
Balance at Apr. 03, 2022	2,474,532	$ 20,132		1,711,690	(19,479)	762,189
Balance, Shares at Apr. 03, 2022		161,053,000	0
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	(3,870)	$ 73		(3,943)
Net issuance of common stock under stock-based plans (in shares)		579,000
Stock-based compensation expense	20,332			20,332
Repurchase of common stock	(98,048)	$ (112)				(97,936)
Repurchase of common stock (in shares)		(893,000)
Cash dividends	(17,179)					(17,179)
Settlements of convertible notes	0	$ 41		(41)
Settlements of convertible notes (in shares)		324,000
Exercise of convertible notes hedge call options	0	$ (41)		41
Exercise of convertible notes hedge call options (in shares)		(324,000)
Net income	83,531					83,531
Other comprehensive income/loss	13,402				13,402
Balance at Apr. 02, 2023	$ 2,449,462	$ 19,431		$ 1,772,352	$ (36,466)	$ 694,145
Balance, Shares at Apr. 02, 2023		155,445,000	0

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Common Stock, Dividends, Per Share, Cash Paid	$ 0.11	$ 0.11

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Cash flows from operating activities:
Net income	$ 83,531	$ 161,928
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	22,680	22,503
Stock-based compensation	18,885	12,894
Amortization	4,926	5,233
Deferred taxes	(7,634)	11,288
(Gains) losses on investments	(2,238)	2,001
Provision for excess and obsolete inventory	5,610	1,590
Other	108	177
Changes in operating assets and liabilities
Accounts receivable	37,204	208
Inventories	(23,697)	(9,480)
Prepayments and other assets	(15,380)	(74,305)
Accounts payable and other accrued expenses	(83,208)	(124,382)
Deferred revenue and customer advances	(32,705)	6,747
Retirement plan contributions	(1,234)	(1,329)
Income taxes	12,488	(7,611)
Net cash provided by operating activities	19,336	7,462
Cash flows from investing activities:
Purchases of property, plant and equipment	(41,444)	(43,999)
Purchases of marketable securities	(69,276)	(165,977)
Proceeds from sales of marketable securities	7,929	30,581
Proceeds from maturities of marketable securities	7,468	96,682
Proceeds from life insurance	460	0
Net cash used for investing activities	(94,863)	(82,713)
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	15,997	16,475
Repurchase of common stock	(93,308)	(201,465)
Payments related to net settlement of employee stock compensation awards	(19,870)	(31,048)
Dividend payments	(17,165)	(17,895)
Payments of convertible debt principal	(15,155)	(20,694)
Net cash used for financing activities	(129,501)	(254,627)
Effects of exchange rate changes on cash and cash equivalents	(537)	2,282
Decrease in cash and cash equivalents	(205,565)	(327,596)
Cash and cash equivalents at beginning of period	854,773	1,122,199
Cash and cash equivalents at end of period	649,208	794,603
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 3,823	$ 2,500

The Company

The Company	3 Months Ended
	Apr. 02, 2023
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 automatic test systems and robotics products. Teradyne’s automatic test systems are used to test semiconductors, wireless products, data storage and complex electronics systems in many industries including consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s robotics products include collaborative robotic arms and autonomous mobile robots (“AMRs”) 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 automatic test equipment and robotics products and services include: • semiconductor test (“Semiconductor Test”) systems; • storage and system level test (“Storage Test”) systems, defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”); • wireless test (“Wireless Test”) systems; and • robotics (“Robotics”) products.

Accounting Policies

Accounting Policies	3 Months Ended
	Apr. 02, 2023
Accounting Policies	B. ACCOUNTING POLICIES Basis of Presentation The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. Certain prior year amounts may have been reclassified to conform to the current year presentation. The December 31, 2022 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, Preparation of Financial Statements and Use of Estimates The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent liabilities. On an on-going COVID-19 10-Q.

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	3 Months Ended
	Apr. 02, 2023
Recently Issued Accounting Pronouncements	C. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS For the three months ended April 2, 2023, there were no recently issued accounting pronouncements that had, or are expected to have, a material impact to Teradyne’s consolidated financial statements.

Revenue

Revenue	3 Months Ended
	Apr. 02, 2023
Revenue from Contract with Customer [Abstract]
Revenue	D. REVENUE Disaggregation of Revenue The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines. Semiconductor Test Robotics System on- a-Chip Memory System Test Universal Robots Mobile Industrial Robots Wireless Test Corporate and Eliminations Total (in thousands) For the Three Months Ended April 2, 2023 (1) Timing of Revenue Recognition Point in Time $ 273,275 $ 61,258 $ 56,857 $ 70,029 $ 15,959 $ 35,363 $ — $ 512,741 Over Time 73,559 6,917 17,774 2,008 1,218 3,312 — 104,788 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ — $ 617,529 Geographical Market Asia Pacific $ 283,259 $ 63,695 $ 39,590 $ 13,217 $ 1,502 $ 23,231 $ — $ 424,494 Americas 41,568 2,944 28,980 20,447 11,806 12,846 — 118,591 Europe, Middle East and Africa 22,007 1,536 6,061 38,373 3,869 2,598 — 74,444 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ — $ 617,529 For the Three Months Ended April 3, 2022 (1) Timing of Revenue Recognition Point in Time $ 323,456 $ 88,723 $ 105,288 $ 83,182 $ 16,744 $ 48,429 $ (346 ) $ 665,476 Over Time 63,129 7,033 13,380 2,102 1,161 3,089 — 89,894 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,905 $ 51,518 $ (346 ) $ 755,370 Geographical Market Asia Pacific $ 340,741 $ 93,151 $ 73,784 $ 18,621 $ 2,592 $ 34,946 $ — $ 563,835 Americas 29,714 2,046 36,608 28,148 8,564 9,687 (346 ) 114,421 Europe, Middle East and Africa 16,130 559 8,276 38,515 6,749 6,885 — 77,114 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,905 $ 51,518 $ (346 ) $ 755,370 (1) Includes $1.3 million and $2.3 million in 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.” Contract Balances During the three months ended April 2, 2023 and April 3, 2022, Teradyne recognized $50.7 million and $35.0 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 April 2, 2023, Teradyne had $1,240.7 million of unsatisfied performance obligations. Teradyne expects to recognize 88% of the remaining performance obligations in the next 12 months and 12% in 1-3 Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet: April 2, 2023 December 31, 2022 (in thousands) Maintenance, service and training $ 70,609 $ 78,089 Extended warranty 49,343 56,180 Customer advances, undelivered elements and other 41,200 59,147 Total deferred revenue and customer advances $ 161,152 $ 193,416 Accounts Receivable During the three months ended April 2, 2023 and April 3, 2022, Teradyne sold certain trade accounts receivables on a non-recourse

Inventories

Inventories	3 Months Ended
	Apr. 02, 2023
Inventories	E. INVENTORIES Inventories, net consisted of the following at April 2, 2023 and December 31, 2022: April 2, 2023 December 31, 2022 (in thousands) Raw material $ 264,035 $ 256,065 Work-in-process 43,987 37,982 Finished goods 44,036 30,972 $ 352,058 $ 325,019 Inventory reserves at April 2, 2023 and December 31, 2022 were $138.6 million and $136.8 million, respectively.

Financial Instruments

Financial Instruments	3 Months Ended
	Apr. 02, 2023
Financial Instruments	F 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 During the three months ended April 2, 2023 and April 3, 2022, there were no transfers in or out of Level 1, Level 2, or Level 3 financial instruments. Realized gains recorded in the three months ended April 2, 2023 and April 3, 2022 were $0.3 million and $0.4 million, respectively. Realized losses recorded in the three months ended April 2, 2023 and April 3, 2022 were $0.1 million and $0.2 million, respectively. Realized gains and losses are included in other (income) expense, net. Unrealized gains on equity securities recorded in the three months ended April 2, 2023 were $2.0 million. Unrealized losses on equity securities recorded in the three months ended April 3, 2022 were $2.2 million. Unrealized gains and losses on equity securities are included in other (income) expense, net. Unrealized gains and losses on available-for-sale 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 April 2, 2023 and December 31, 2022. April 2, 2023 Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total (in thousands) Assets Cash $ 244,542 $ — $ — $ 244,542 Cash equivalents 252,374 152,292 — 404,666 Available-for-sale U.S. Treasury securities — 52,168 — 52,168 Corporate debt securities — 51,369 — 51,369 Commercial paper — 47,548 — 47,548 U.S. government agency securities — 7,394 — 7,394 Debt mutual funds 6,800 — — 6,800 Certificates of deposit and time deposits — 1,754 — 1,754 Non-U.S. — 554 — 554 Equity securities: Mutual funds 42,246 — — 42,246 Total $ 545,962 $ 313,079 $ — $ 859,041 Liabilities Derivative liabilities $ — $ 1,980 $ — $ 1,980 Total $ — $ 1,980 $ — $ 1,980 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 496,916 $ 152,292 $ — $ 649,208 Marketable securities — 92,895 — 92,895 Long-term marketable securities 49,046 67,892 — 116,938 Total $ 545,962 $ 313,079 $ — $ 859,041 Liabilities Other current liabilities $ — $ 1,980 $ — $ 1,980 Total $ — $ 1,980 $ — $ 1,980 December 31, 2022 Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total (in thousands) Assets Cash $ 632,417 $ — $ — $ 632,417 Cash equivalents 161,767 60,589 — 222,356 Available for sale securities: Corporate debt securities — 50,856 — 50,856 U.S. Treasury securities — 39,649 — 39,649 Commercial paper — 7,159 — 7,159 Debt mutual funds 6,580 — — 6,580 U.S. government agency securities — 6,352 — 6,352 Certificates of deposit and time deposits — 1,740 — 1,740 Non-U.S. — 535 — 535 Equity securities: Mutual funds 37,518 — — 37,518 Total $ 838,282 $ 166,880 $ — $ 1,005,162 Derivative assets — 86 — 86 Total $ 838,282 $ 166,966 $ — $ 1,005,248 Liabilities Derivative liabilities $ — $ 4,215 $ — $ 4,215 Total $ — $ 4,215 $ — $ 4,215 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 794,184 $ 60,589 $ — $ 854,773 Marketable securities — 39,612 — 39,612 Long-term marketable securities 44,098 66,679 — 110,777 Prepayments — 86 — 86 Total $ 838,282 $ 166,966 $ — $ 1,005,248 Liabilities Other current liabilities $ — $ 4,215 $ — $ 4,215 Total $ — $ 4,215 $ — $ 4,215 The carrying amounts and fair values of Teradyne’s financial instruments at April 2, 2023 and December 31, 2022 were as follows: April 2, 2023 December 31, 2022 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 649,208 $ 649,208 $ 854,773 $ 854,773 Marketable securities 209,833 209,833 150,389 150,389 Derivative assets — — 86 86 Liabilities Derivative liabilities 1,980 1,980 4,215 4,215 Convertible debt 35,109 119,586 50,115 139,007 The fair values of accounts receivable, net and accounts payable approximate the carrying value due to the short-term nature of these instruments. The following table summarizes the composition of available-for-sale April 2, 2023 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) U.S. Treasury securities $ 55,615 $ 38 $ (3,485 ) $ 52,168 $ 49,669 Corporate debt securities 56,040 41 (4,712 ) 51,369 49,131 Commercial paper 47,225 337 (14 ) 47,548 16,845 U.S. government agency securities 7,427 9 (42 ) 7,394 4,419 Debt mutual funds 7,130 — (330 ) 6,800 3,312 Certificates of deposit and time deposits 1,754 — — 1,754 — Non-U.S. 554 — — 554 — $ 175,745 $ 425 $ (8,583 ) $ 167,587 $ 123,376 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 92,915 $ 337 $ (357 ) $ 92,895 $ 60,438 Long-term marketable securities 82,830 88 (8,226 ) 74,692 62,938 $ 175,745 $ 425 $ (8,583 ) $ 167,587 $ 123,376 The following table summarizes the composition of available-for-sale December 31, 2022 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Corporate debt securities $ 57,006 $ 3 $ (6,153 ) $ 50,856 $ 50,667 U.S. Treasury securities 44,030 — (4,381 ) 39,649 39,649 Commercial paper 7,089 70 — 7,159 — Debt mutual funds 6,997 — (417 ) 6,580 3,095 U.S. government agency securities 6,442 — (90 ) 6,352 6,352 Certificates of deposit and time deposits 1,740 — — 1,740 — Non-U.S. 535 — — 535 — $ 123,839 $ 73 $ (11,041 ) $ 112,871 $ 99,763 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 39,950 $ 70 $ (408 ) $ 39,612 $ 30,713 Long-term marketable securities 83,889 3 (10,633 ) 73,259 69,050 $ 123,839 $ 73 $ (11,041 ) $ 112,871 $ 99,763 As of April 2, 2023, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $68.4 million and $55.0 million, respectively. As of December 31, 2022, the fair market value of investments with unrealized losses for less than one year and greater than one year totaled $66.3 million and $33.4 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 April 2, 2023 and December 31, 2022 were not other than temporary. The contractual maturities of investments in available-for-sale April 2, 2023 Cost Fair Market Value (in thousands) Due within one year $ 92,915 $ 92,895 Due after 1 year through 5 years 31,721 30,672 Due after 5 years through 10 years 5,022 4,612 Due after 10 years 38,957 32,608 Total $ 168,615 $ 160,787 Contractual maturities of investments in available-for-sale 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 April 2, 2023 and December 31, 2022, Teradyne had the following contracts to buy and sell non-U.S. non-U.S. April 2, 2023 December 31, 2022 Buy Position Sell Position Net Total Buy Position Sell Position Net Total (in millions) Japanese Yen $ (57.7 ) $ — $ (57.7 ) $ (37.1 ) $ — $ (37.1 ) Taiwan Dollar (38.3 ) — (38.3 ) (29.2 ) — (29.2 ) Korean Won (3.1 ) — (3.1 ) (6.4 ) — (6.4 ) British Pound Sterling (1.2 ) — (1.2 ) (1.2 ) — (1.2 ) Singapore Dollar — 35.7 35.7 — 33.5 33.5 Euro — 24.3 24.3 — 38.4 38.4 Philippine Peso — 2.5 2.5 — 2.7 2.7 Chinese Yuan — 1.9 1.9 — 2.2 2.2 Total $ (100.3 ) $ 64.4 $ (35.9 ) $ (73.9 ) $ 76.8 $ 2.9 The fair value of the outstanding contracts was a loss of $1.1 million and $0.9 million, respectively, at April 2, 2023 and December 31, 2022. 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 April 2, 2023 and December 31, 2022, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. April 2, 2023 December 31, 2022 Buy Position Sell Position Net Total Buy Position Sell Position Net Total (in millions) Japanese Yen $ (13.6 ) $ 30.2 $ 16.6 $ (23.4 ) $ 61.2 $ 37.8 Taiwan Dollar — — — (5.5 ) 10.9 5.4 Total $ (13.6 ) $ 30.2 $ 16.6 $ (28.9 ) $ 72.1 $ 43.2 The fair value of the outstanding cash flow hedge contracts was a loss of $0.9 million and $3.2 million at April 2, 2023 and December 31, 2022, respectively. 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. The following table summarizes the fair value of derivative instruments as of April 2, 2023 and December 31, 2022: Balance Sheet Location April 2, 2023 December 31, 2022 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Prepayments $ — $ 86 Foreign exchange forward contracts Other current liabilities (1,057 ) (990 ) Derivatives designated as hedging instruments: Foreign exchange option contracts Other current liabilities (923 ) (3,225 ) Total derivatives $ (1,980 ) $ (4,129 ) The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three months ended April 2, 2023 and April 3, 2022: For the Three Months Ended Location of Losses (Gains) Recognized in Statement of Operations April 2, 2023 April 3, 2022 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Other (income) expense, net $ 1,259 $ (1,752 ) Derivatives designated as hedging instruments: Foreign exchange option contracts Revenue 1,538 — Total Derivatives $ 2,797 $ (1,752 ) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. For the three months ended April 2, 2023 and April 3, 2022 net losses from remeasurement of monetary assets and liabilities denominated in foreign currencies were $0.4 million, and $4.3 million, respectively. See Note G: “Debt” regarding derivatives related to the convertible senior notes.

Debt

Debt	3 Months Ended
	Apr. 02, 2023
Debt	G Convertible Senior Notes On December 12, 2016, Teradyne completed a private offering of $460.0 million aggregate principal amount of 1.25% convertible senior unsecured notes (the “Notes”) due December 15, 2023 and received net proceeds, after issuance costs, of approximately $450.8 million, $33.0 million of which was used to pay the net cost of the convertible note hedge transactions and $50.1 million of which was used to repurchase 2.0 million shares of Teradyne’s common stock under its existing stock repurchase program from purchasers of the Notes in privately negotiated transactions effected through one of the initial purchasers or its affiliates conducted concurrently with the pricing of the Note offering. The Notes will mature on December 15, 2023, unless earlier repurchased or converted. The Notes bear interest at a rate of 1.25% per year payable semiannually in arrears on June 15 and December 15 of each year. The Notes will be convertible at the option of the noteholders at any time prior to the close of business on the business day immediately preceding September 15, 2023, only under the following circumstances: (1) during any calendar quarter beginning after March 31, 2017 (and only during such calendar quarter), if the closing sale price of Teradyne’s common stock, for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price (as defined in the Indenture) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the closing sale price of the Teradyne’s common stock and the conversion rate on each such trading day; and (3) upon the occurrence of specified corporate events. On or after September 15, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Notes at any time, regardless of the foregoing circumstances. Teradyne may satisfy its future conversion obligation by paying cash for the principal amount of the Notes and paying or delivering cash, shares of its common stock or a combination of cash and shares of its common stock, at Teradyne’s election for the amount in excess of principal. On November 4, 2021, Teradyne made an irrevocable election under the Indenture to require the principal portion of the remaining Notes to be settled in cash. As of April 2, 2023, the conversion price was approximately $31.44 per share of Teradyne’s common stock. The conversion rate is subject to adjustment under certain circumstances. As of May 5, 2023, one hundred and thirty debt holders had exercised the option to convert $427.2 million worth of notes. Concurrent with the offering of the Notes, Teradyne entered into convertible note hedge transactions (the “Note Hedge Transactions”) with the initial purchasers or their affiliates (the “Option Counterparties”). The Note Hedge Transactions cover, subject to customary anti-dilution adjustments, the number of shares of the common stock that underlie the Notes, with a strike price equal to the conversion price of the Notes of $31.44. 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 The Note Hedge Transactions are expected to reduce the potential dilution to Teradyne’s common stock upon any conversion of the Notes. However, the Warrant Transactions could separately have a dilutive effect to the extent that the market value per share of Teradyne’s common stock exceeds the applicable strike price of the warrant. The net cost of the Note Hedge Transactions, after being partially offset by the proceeds from the sale of the warrants, was approximately $33.0 million. In connection with establishing their initial hedge of these convertible note hedge and warrant transactions, the Option Counterparties have entered into various derivative transactions with respect to Teradyne’s common stock and/or purchased shares of Teradyne’s common stock or other securities, including the Notes, concurrent with, or shortly after, the pricing of the Notes. In addition, the Option Counterparties may modify their hedge positions by entering into or unwinding various derivative transactions with respect to Teradyne’s common stock or by selling Teradyne’s common stock or other securities, including the Notes, in secondary market transactions (and may do so during any observation period related to the conversion of the Notes). These activities could adversely affect the value of Teradyne’s common stock and the Notes. Originally, Teradyne allocated $100.8 million of the $460.0 million principal amount of the Notes to the equity component, which represented a discount to the debt and was amortized to interest expense using the effective interest method through December 2023. Effective January 1, 2022, Teradyne adopted ASC 2020-06 paid-in Debt issuance fees at April 2, 2023, have been fully amortized to interest expense using the effective interest method over the seven-year term of the Notes. The tables below represent the key components of Teradyne’s convertible senior notes: April 2, 2023 December 31, 2022 (in thousands) Debt principal $ 35,109 $ 50,228 Unamortized debt issuance fees — 113 Net carrying amount of convertible debt $ 35,109 $ 50,115 Teradyne’s convertible senior notes were reported as current debt at April 2, 2023 and December 31, 2022. The interest expense on Teradyne’s convertible senior notes for the three months ended April 2, 2023 and April 3, 2022 was as follows: For the Three Months Ended April 2, 2023 April 3, 2022 (in thousands) Contractual interest expense on the coupon $ 138 $ 311 Amortization of the issue fees recognized as interest expense 113 66 Total interest expense on the convertible debt $ 251 $ 377 As of April 2, 2023, the conversion price was approximately $31.44 per share and the if converted value of the notes was $120.0 million. Additional conversions of approximately $2.3 million of debt principal will occur in the second quarter of 2023. Teradyne expects to make principal interest payments of $0.4 million in the next 12 months. Revolving Credit Facility On May 1, 2020, Teradyne entered into a credit agreement (the “Credit Agreement”) with Truist Bank, as administrative agent and collateral agent, and the lenders party thereto. The Credit Agreement provided for a three-year, senior secured revolving credit facility of $400.0 million (the “Credit Facility”). On December 10, 2021, the Credit Agreement was amended to extend the maturity date of the Credit Facility to December 10, 2026. On October 5, 2022, the Credit Agreement was amended to increase the amount of the Credit Facility to $750.0 million from $400.0 million. The Credit Agreement provides that, subject to customary conditions, Teradyne may seek to obtain from existing or new lenders the available incremental amount under the Credit Facility, not to exceed the greater of $200.0 million or 15% of consolidated EBIDTA. The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio. Teradyne is not required to repay any loans under the Credit Facility prior to maturity, subject to certain customary exceptions. Teradyne is permitted to prepay all or any portion of the loans under the Credit Facility prior to maturity without premium or penalty, other than customary SOFR breakage costs. The Credit Agreement contains customary events of default, representations, warranties and affirmative and negative covenants that, among other things, limit Teradyne’s ability to sell assets, grant liens on assets, incur other secured indebtedness and make certain investments and restricted payments, all subject to exceptions set forth in the Credit Agreement. The Credit Agreement also requires Teradyne to satisfy two financial ratios measured as of the end of each fiscal quarter: a consolidated leverage ratio and an interest coverage ratio. The Credit Facility is guaranteed by certain of Teradyne’s domestic subsidiaries and collateralized by assets of Teradyne and such subsidiaries, including a pledge of 65% of the capital stock of certain foreign subsidiaries. As of May 5, 2023, the Credit Agreement was undrawn and Teradyne was in compliance with all covenants under the Credit Agreement.

Prepayments

Prepayments	3 Months Ended
	Apr. 02, 2023
Prepayments [Abstract]
Prepayments	H Prepayments consist of the following: April 2, 2023 December 31, 2022 (in thousands) Contract manufacturer and supplier prepayments $ 494,849 $ 491,105 Prepaid taxes 22,677 18,625 Prepaid maintenance and other services 16,591 14,545 Other prepayments 14,997 8,687 Total prepayments $ 549,114 $ 532,962

Product Warranty

Product Warranty	3 Months Ended
	Apr. 02, 2023
Product Warranty	I Teradyne generally provides a one-year For the Three Months Ended April 2, 2023 April 3, 2022 (in thousands) Balance at beginning of period $ 14,181 $ 24,577 Accruals for warranties issued during the period 4,117 4,100 Accruals related to pre-existing (405 ) (2,758 ) Settlements made during the period (4,992 ) (5,814 ) Balance at end of period $ 12,901 $ 20,105 When Teradyne receives revenue for extended warranties, beyond one year, it is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances. For the Three Months Ended April 2, 2023 April 3, 2022 (in thousands) Balance at beginning of period $ 56,180 $ 64,168 Deferral of new extended warranty revenue 4,413 11,774 Recognition of extended warranty deferred revenue (11,250 ) (10,216 ) Balance at end of period $ 49,343 $ 65,726

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 02, 2023
Stock-Based Compensation	J On February 1, 2023 (the” Retirement Date”), Mark E. Jagiela retired as Chief Executive Officer of Teradyne and a member of Teradyne’s Board of Directors, and Teradyne entered into an agreement (the “Retirement Agreement”) with Mr. Jagiela. Under the Retirement Agreement, Mr. Jagiela’s unvested time-based restricted stock units and stock options granted prior to his Retirement Date were modified to allow continued vesting; and any vested options or options that vest during that period may be exercised for the remainder of the applicable option term. During the three months ended April 2, 2023, Teradyne recorded a stock based compensation expense of $5.9 million related to the Retirement Agreement. Under Teradyne’s stock compensation plans, Teradyne grants time-based restricted stock units, performance-based restricted stock units and stock options, and employees are eligible to purchase Teradyne’s common stock through its Employee Stock Purchase Plan (“ESPP”). Service-based restricted stock unit awards granted to employees vest in equal annual installments over four years. Restricted stock unit awards granted to non-employee one-year 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 Non-GAAP non-cash non-recurring If a PRSU recipient’s employment ends prior to the determination of the performance percentage due to (1) permanent disability or death or (2) retirement or termination other than for cause, after attaining both at least age sixty and at least ten years of service, then all or a portion of the recipient’s PRSUs (based on the actual performance percentage achieved on the determination date) will vest on the date the performance percentage is determined. Except as set forth in the preceding sentence, no PRSUs will vest if the executive officer is no longer an employee at the end of the three-year period. Stock options to purchase Teradyne’s common stock at 100% of the fair market value on the grant date vest in equal annual installments over four years from the grant date and have a maximum term of seven years During the three months ended April 2, 2023 and April 3, 2022, Teradyne granted 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 $102.36 and $111.31, respectively. During the three months ended April 2, 2023 and April 3, 2022, Teradyne granted 0.1 million of PBIT PRSUs with a grant date fair value of $102.23 and $110.84, respectively. During the three months ended April 2, 2023 and April 3, 2022, Teradyne granted 0.1 million of TSR PRSUs, with a grant date fair value of $137.64 and $101.06, respectively. The fair value was estimated using the Monte Carlo simulation model with the following assumptions: For the Three Months Ended April 2, 2023 April 3, 2022 Risk-free interest rate 3.9 % 1.4 % Teradyne volatility-historical 50.2 % 47.1 % NYSE Composite Index volatility-historical 24.8 % 22.7 % Dividend yield 0.4 % 0.4 % Expected volatility was based on the historical volatility of Teradyne’s stock and the NYSE Composite Index over the most recent three-year period. The risk-free interest rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Dividend yield was based upon an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $103.44 for the 2023 grant and an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $112.12 for the 2022 grant. During the three months ended April 2, 2023 and April 3, 2022, Teradyne granted 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $40.90 and $39.01, respectively. The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions: For the Three Months Ended April 2, 2023 April 3, 2022 Expected life (years) 4.0 4.0 Risk-free interest rate 3.7 % 1.6 % Volatility-historical 46.7 % 43.7 % Dividend yield 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 $0.44 per share divided by Teradyne’s stock price on the grant date of $103.44 for the 2023 grant and an estimated annual dividend amount of $0.44 per share divided by Teradyne’s stock price on the grant date of $112.12 for the 2022 grant.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Apr. 02, 2023
Accumulated Other Comprehensive Income (Loss)	K Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following: Foreign Currency Translation Adjustment Unrealized Marketable Securities Unrealized Retirement Plans Service Credit Total (in thousands) Three Months Ended April 2, 2023 Balance at December 31, 2022, net of tax of $0, $(2,308), $(708), $(1,130), respectively $ (39,849 ) $ (8,661 ) $ (2,517 ) $ 1,159 $ (49,868 ) Other comprehensive gain before reclassifications, net of tax of $0, $503, $167, $0, respectively 9,309 2,294 596 — 12,199 Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $2, $338, $0, respectively — 5 1,200 (2 ) 1,203 Net current period other comprehensive gain (loss), net of tax of $0, $505, $505 $0, respectively 9,309 2,299 1,796 (2 ) 13,402 Balance at April 2, 2023, net of tax of $0, $(1,803), $(203), $(1,130) respectively $ (30,540 ) $ (6,362 ) $ (721 ) $ 1,157 $ (36,466 ) Three Months Ended April 3, 2022 Balance at December 31, 2021, net of tax of $0, $1,055, $0, $(1,128), respectively $ (10,818 ) $ 3,704 $ — $ 1,166 $ (5,948 ) Other comprehensive loss before reclassifications, net of tax of $0, $(1,333), $0, $0, respectively (8,076 ) (5,388 ) — — (13,464 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(18), $0, $0, respectively — (65 ) — (2 ) (67 ) Net current period other comprehensive loss, net of tax of $0, $(1,351), $0, $0, respectively (8,076 ) (5,453 ) — (2 ) (13,531 ) Balance at April 3, 2022, net of tax of $0, $(296), $0, $(1,128), respectively $ (18,894 ) $ (1,749 ) $ — $ 1,164 $ (19,479 ) Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended April 2, 2023 and April 3, 2022, were as follows: Details about Accumulated Other Comprehensive Income (Loss) Components For the Three Months Ended Affected Line Item in the Statements of Operations April 2, April 3, 2023 2022 (in thousands) Available-for-sale Unrealized (losses) gains, net of tax of $(2) and $18, respectively $ (5 ) $ 65 Other (income) Cash flow hedges: Unrealized losses, net of tax of $(338) and $0, respectively (1,200 ) — Revenue Defined benefit pension and postretirement plans: Amortization of prior service benefit, net of tax of $0 and $0, respectively 2 2 (a) Total reclassifications, net of tax of $(340) and $18, respectively $ (1,203 ) $ 67 Net income (a) The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note O

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	3 Months Ended
	Apr. 02, 2023
Goodwill and Acquired Intangible Assets	L Goodwill Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “Intangibles—Goodwill and Other” The changes in the carrying amount of goodwill by reportable segments for the three months ended April 2, 2023, were as follows: Robotics Wireless Test Semiconductor Test System Test Total (in thousands) Balance at December 31, 2022 Goodwill $ 383,166 $ 361,819 $ 262,077 $ 158,699 $ 1,165,761 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) 383,166 7,976 1,537 10,516 403,195 Foreign currency translation adjustment 6,609 — 24 — 6,633 Balance at April 2, 2023 Goodwill 389,775 361,819 262,101 158,699 1,172,394 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) $ 389,775 $ 7,976 $ 1,561 $ 10,516 $ 409,828 Intangible Assets Teradyne reviews long-lived assets for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of these assets are no longer appropriate. Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: Gross Carrying Amount Accumulated Amortization Foreign Currency Translation Adjustment Net Carrying Amount (in thousands) Balance at April 2, 2023 Developed technology $ 270,967 $ (237,269 ) $ (5,560 ) $ 28,138 Customer relationships 57,739 (51,756 ) 184 6,167 Tradenames and trademarks 59,387 (43,101 ) (1,345 ) 14,941 Total intangible assets $ 388,093 $ (332,126 ) $ (6,721 ) $ 49,246 Balance, December 31, 2022 Developed technology $ 270,967 $ (234,208 ) $ (5,935 ) $ 30,824 Customer relationships 57,739 (51,186 ) 172 6,725 Tradenames and trademarks 59,387 (41,930 ) (1,528 ) 15,929 Total intangible assets $ 388,093 $ (327,324 ) $ (7,291 ) $ 53,478 Aggregate intangible asset amortization expense for the three months ended April 2, 2023 and April 3, 2022 was $4.8 million and $5.1 million, respectively. Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows: Year Amortization Expense (in thousands) 2023 $ 14,219 2024 18,749 2025 11,320 2026 2,371 2027 1,155 Thereafter 1,432

Net Income Per Common Share

Net Income Per Common Share	3 Months Ended
	Apr. 02, 2023
Net Income per Common Share	M The following table sets forth the computation of basic and diluted net income per common share: For the Three Months Ended April 2, April 3, 2023 2022 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 83,531 $ 161,928 Weighted average common shares-basic 155,904 162,048 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 8,983 10,028 Incremental shares from assumed conversion of convertible notes (2) 914 2,541 Restricted stock units 453 875 Stock options 48 69 Employee stock purchase plan 6 14 Dilutive potential common shares 10,404 13,527 Weighted average common shares-diluted 166,308 175,575 Net income per common share-basic $ 0.54 $ 1.00 Net income per common share-diluted $ 0.50 $ 0.92 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. (2) Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period. The computation of diluted net income per common share for the three months ended April 2, 2023 and April 3, 2022 excludes the effect of the potential vesting of 0.5 million and 0.1 million, respectively, of restricted stock units because the effect would have been anti-dilutive.

Restructuring and Other

Restructuring and Other	3 Months Ended
	Apr. 02, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Other	N During the three months ended April 2, 2023, Teradyne recorded $2.0 million of severance charges related to headcount reductions of 67 people primarily in Semiconductor Test, Robotics and Corporate. During the three months ended April 3, 2022, Teradyne recorded a charge of $14.7 million related to the arbitration claim filed against Teradyne and AutoGuide related to an earn-out

Retirement Plans

Retirement Plans	3 Months Ended
	Apr. 02, 2023
Retirement Plans	O 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. In the three months ended April 2, 2023 and April 3, 2022, Teradyne contributed $0.8 million and $0.8 million, respectively, to the U.S. supplemental executive defined benefit pension plan, and $0.2 million and $0.3 million, respectively, to certain qualified pension plans for non-U.S. For the three months ended April 2, 2023 and April 3, 2022, Teradyne’s net periodic pension cost was comprised of the following: For the Three Months Ended April 2, 2023 April 3, 2022 United States Foreign United States Foreign (in thousands) Service cost $ 272 $ 109 $ 397 $ 206 Interest cost 1,711 262 1,222 118 Expected return on plan assets (1,285 ) (9 ) (732 ) (20 ) Total net periodic pension cost $ 698 $ 362 $ 887 $ 304 Postretirement Benefit Plan In addition to receiving pension benefits, Teradyne employees in the United States who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees’ survivors and are available to all retirees. Substantially all of Teradyne’s current U.S. employees could become eligible for these benefits and the existing benefit obligation relates primarily to those employees. For the three months ended April 2, 2023 and April 3, 2022, Teradyne’s net periodic postretirement benefit cost was comprised of the following: For the Three Months Ended April 2, April 3, 2023 2022 (in thousands) Service cost $ 9 $ 17 Interest cost 61 44 Amortization of prior service credit (2 ) (2 ) Total net periodic postretirement benefit cost $ 68 $ 59

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 02, 2023
Commitments and Contingencies	P Purchase Commitments As of April 2, 2023, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $589.7 million, of which $530.7 million is for less than one year. Legal Claims Teradyne is subject to various legal proceedings and claims which have arisen in the ordinary course of business such as, but not limited to, patent, employment, commercial and environmental matters. Teradyne believes that it has meritorious defenses against all pending claims and intends to vigorously contest them. While it is not possible to predict or determine the outcomes of any pending claims or to provide possible ranges of losses that may arise, Teradyne believes the potential losses associated with all of these actions are unlikely to have a material adverse effect on its business, financial position or results of operations. 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 earn-out earn-out 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 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 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 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 April 2, 2023 and December 31, 2022, except for product warranty, Teradyne has not recorded any liabilities for these guarantees and obligations because the amount would be immaterial.

Income Taxes

Income Taxes	3 Months Ended
	Apr. 02, 2023
Income Taxes	Q A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows: For the Three Months Ended April 2, April 3, 2023 2022 US statutory federal tax rate 21.0 % 21.0 % Non-deductible 0.9 1.1 Discrete benefit related to equity compensation (3.3 ) (6.6 ) International provisions of the U.S. Tax Cuts and Jobs Act of 2017 (3.2 ) (1.3 ) Tax credits (2.5 ) (1.6 ) Foreign taxes (0.6 ) (3.4 ) Other, net 1.7 1.0 Effective tax rate 14.0 % 10.2 % On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of April 2, 2023, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not As of April 2, 2023 and December 31, 2022, Teradyne had $15.7 million and $15.6 million, respectively, of reserves for uncertain tax positions. The $0.1 million net increase in reserves for uncertain tax positions is related to U.S. federal research and development credits generated in the current year. As of April 2, 2023, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $0.1 million in the next twelve months because of a lapse of statutes of limitation. The estimated decrease relates to U.S. state research and development credits. Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of April 2, 2023 and December 31, 2022, $0.4 million and $0.4 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the three months ended April 2, 2023 and April 3, 2022, expense of $0.1 million and $0.1 million, respectively, was recorded for interest and penalties related to income tax items. Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the three months ended April 2, 2023 was $0.2 million, or $0.0 per diluted share. The tax savings due to the tax holiday for the three months ended April 3, 2022 was $3.5 million, or $0.02 per diluted share. In November 2020, Teradyne entered into an agreement with the Singapore Economic Development Board which extended our Singapore tax holiday under substantially similar terms to the agreement which expired on December 31, 2020. The new tax holiday is scheduled to expire on December 31, 2025. On August 16, 2022, the Inflation Reduction Act of 2022 (“IRA”) was signed into law. The IRA introduced a 15% alternative minimum tax based on the financial statement income of certain large corporations (“CAMT”), effective January 1, 2023. Teradyne currently does not expect the CAMT to have a material impact on its financial results.

Segment Information

Segment Information	3 Months Ended
	Apr. 02, 2023
Segment Reporting [Abstract]
Segment Information	R Teradyne has four reportable segments (Semiconductor Test, System Test, Wireless Test and Robotics). Each of the reportable segments represents an individual operating segment. The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The System Test segment includes operations related to the design, manufacturing and marketing of products and services for defense/aerospace instrumentation test, storage and system level test, and circuit-board test. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test products and services. The Robotics segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms, autonomous mobile robots and advanced robotic control software. Each operating segment has a segment manager who is accountable to and maintains regular contact with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts and plans for the segment. Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies” in Teradyne’s Annual Report on Form 10-K Segment information for the three months ended April 2, 2023 and April 3, 2022 is as follows: Semiconductor Test System Test Robotics Wireless Test Corporate and Eliminations Consolidated (in thousands) Three Months Ended April 2, 2023 Revenues $ 415,009 $ 74,631 $ 89,214 $ 38,675 $ — $ 617,529 Income (loss) before income taxes (1)(2) 96,185 15,275 (18,490 ) 9,352 (5,238 ) 97,084 Total assets (3) 1,386,851 173,669 676,092 87,875 1,058,920 3,383,407 Three Months Ended April 3, 2022 Revenues $ 482,341 $ 118,668 $ 103,189 $ 51,518 $ (346 ) $ 755,370 Income (loss) before income taxes (1)(2) 149,705 41,322 (5,098 ) 18,619 (24,189 ) 180,359 Total assets (3) 1,296,070 187,283 675,560 113,821 1,336,420 3,609,154 (1) Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, legal and environmental fees, severance charges, acquisition related charges and compensation and an expense for the modification of Teradyne’s former chief executive officer’s outstanding equity awards. (2) Included in income (loss) before taxes are charges related to restructuring and other, and inventory charges. (3) Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets. Included in each segment are charges and credits in the following line items in the statements of operations: For the Three Months Ended April 2, April 3, 2023 2022 (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ 3,768 $ — Restructuring and other—employee severance 794 — System Test: Cost of revenues—inventory charge $ 675 — Robotics: Cost of revenues—inventory charge $ 782 $ — Wireless: Cost of revenues—inventory charge $ — $ 877 Corporate and Other: Selling and administrative - equity modification charge $ 5,889 $ — Restructuring and other—employee severance 659 — Restructuring and other—legal settlement charge — 14,700

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Apr. 02, 2023
Equity [Abstract]
Shareholders' Equity	S Stock Repurchase Program In January 2023, Teradyne’s Board of Directors cancelled its January 2021 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock. Teradyne intends to repurchase up to $500.0 million of its common stock in 2023 based on market conditions. During the three months ended April 2, 2023, Teradyne repurchased 0.9 million shares of common stock for a total cost of $93.7 million at an average price of $104.88 per share. As of January 1, 2023, share repurchases in excess of issuances are subject to a 1% excise tax, which is included as part of the cost basis of the shares acquired. During the three months ended April 3, 2022, Teradyne repurchased 1.8 million shares of common stock for $201.5 million at an average price of $115.12 per share. The total cost of shares acquired includes commissions and, starting in 2023, related excise tax, and is recorded as a reduction to retained earnings. Dividend Holders of Teradyne’s common stock are entitled to receive dividends when they are declared by Teradyne’s Board of Directors. In January 2023 and January 2022, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.11 per share. Dividend payments for the three months ended April 2, 2023 and April 3, 2022 were $17.2 million and $17.9 million, respectively.

Accounting Policies (Policies)

Accounting Policies (Policies)	3 Months Ended
	Apr. 02, 2023
Basis of Presentation	Basis of Presentation The consolidated interim financial statements include the accounts of Teradyne and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair statement of such interim financial statements. Certain prior year amounts may have been reclassified to conform to the current year presentation. The December 31, 2022 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by United States of America generally accepted accounting principles (“U.S. GAAP”) for complete financial statements. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K,
Preparation of Financial Statements and Use of Estimates	Preparation of Financial Statements and Use of Estimates The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent liabilities. On an on-going COVID-19 10-Q.

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Apr. 02, 2023
Revenue from Contract with Customer [Abstract]
Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition	The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines. Semiconductor Test Robotics System on- a-Chip Memory System Test Universal Robots Mobile Industrial Robots Wireless Test Corporate and Eliminations Total (in thousands) For the Three Months Ended April 2, 2023 (1) Timing of Revenue Recognition Point in Time $ 273,275 $ 61,258 $ 56,857 $ 70,029 $ 15,959 $ 35,363 $ — $ 512,741 Over Time 73,559 6,917 17,774 2,008 1,218 3,312 — 104,788 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ — $ 617,529 Geographical Market Asia Pacific $ 283,259 $ 63,695 $ 39,590 $ 13,217 $ 1,502 $ 23,231 $ — $ 424,494 Americas 41,568 2,944 28,980 20,447 11,806 12,846 — 118,591 Europe, Middle East and Africa 22,007 1,536 6,061 38,373 3,869 2,598 — 74,444 Total $ 346,834 $ 68,175 $ 74,631 $ 72,037 $ 17,177 $ 38,675 $ — $ 617,529 For the Three Months Ended April 3, 2022 (1) Timing of Revenue Recognition Point in Time $ 323,456 $ 88,723 $ 105,288 $ 83,182 $ 16,744 $ 48,429 $ (346 ) $ 665,476 Over Time 63,129 7,033 13,380 2,102 1,161 3,089 — 89,894 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,905 $ 51,518 $ (346 ) $ 755,370 Geographical Market Asia Pacific $ 340,741 $ 93,151 $ 73,784 $ 18,621 $ 2,592 $ 34,946 $ — $ 563,835 Americas 29,714 2,046 36,608 28,148 8,564 9,687 (346 ) 114,421 Europe, Middle East and Africa 16,130 559 8,276 38,515 6,749 6,885 — 77,114 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,905 $ 51,518 $ (346 ) $ 755,370 (1) Includes $1.3 million and $2.3 million in 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”
Deferred Revenue and Customer Advances	Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet: April 2, 2023 December 31, 2022 (in thousands) Maintenance, service and training $ 70,609 $ 78,089 Extended warranty 49,343 56,180 Customer advances, undelivered elements and other 41,200 59,147 Total deferred revenue and customer advances $ 161,152 $ 193,416

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Apr. 02, 2023
Composition of Inventories, Net	Inventories, net consisted of the following at April 2, 2023 and December 31, 2022: April 2, 2023 December 31, 2022 (in thousands) Raw material $ 264,035 $ 256,065 Work-in-process 43,987 37,982 Finished goods 44,036 30,972 $ 352,058 $ 325,019

Financial Instruments (Tables)

Financial Instruments (Tables)	3 Months Ended
	Apr. 02, 2023
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The following table sets forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of April 2, 2023 and December 31, 2022. April 2, 2023 Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total (in thousands) Assets Cash $ 244,542 $ — $ — $ 244,542 Cash equivalents 252,374 152,292 — 404,666 Available-for-sale U.S. Treasury securities — 52,168 — 52,168 Corporate debt securities — 51,369 — 51,369 Commercial paper — 47,548 — 47,548 U.S. government agency securities — 7,394 — 7,394 Debt mutual funds 6,800 — — 6,800 Certificates of deposit and time deposits — 1,754 — 1,754 Non-U.S. — 554 — 554 Equity securities: Mutual funds 42,246 — — 42,246 Total $ 545,962 $ 313,079 $ — $ 859,041 Liabilities Derivative liabilities $ — $ 1,980 $ — $ 1,980 Total $ — $ 1,980 $ — $ 1,980 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 496,916 $ 152,292 $ — $ 649,208 Marketable securities — 92,895 — 92,895 Long-term marketable securities 49,046 67,892 — 116,938 Total $ 545,962 $ 313,079 $ — $ 859,041 Liabilities Other current liabilities $ — $ 1,980 $ — $ 1,980 Total $ — $ 1,980 $ — $ 1,980 December 31, 2022 Quoted Prices in Active Markets for Identical Instruments (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total (in thousands) Assets Cash $ 632,417 $ — $ — $ 632,417 Cash equivalents 161,767 60,589 — 222,356 Available for sale securities: Corporate debt securities — 50,856 — 50,856 U.S. Treasury securities — 39,649 — 39,649 Commercial paper — 7,159 — 7,159 Debt mutual funds 6,580 — — 6,580 U.S. government agency securities — 6,352 — 6,352 Certificates of deposit and time deposits — 1,740 — 1,740 Non-U.S. — 535 — 535 Equity securities: Mutual funds 37,518 — — 37,518 Total $ 838,282 $ 166,880 $ — $ 1,005,162 Derivative assets — 86 — 86 Total $ 838,282 $ 166,966 $ — $ 1,005,248 Liabilities Derivative liabilities $ — $ 4,215 $ — $ 4,215 Total $ — $ 4,215 $ — $ 4,215 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 794,184 $ 60,589 $ — $ 854,773 Marketable securities — 39,612 — 39,612 Long-term marketable securities 44,098 66,679 — 110,777 Prepayments — 86 — 86 Total $ 838,282 $ 166,966 $ — $ 1,005,248 Liabilities Other current liabilities $ — $ 4,215 $ — $ 4,215 Total $ — $ 4,215 $ — $ 4,215
Schedule of Carrying Amounts and Fair Values of Financial Instruments	The carrying amounts and fair values of Teradyne’s financial instruments at April 2, 2023 and December 31, 2022 were as follows: April 2, 2023 December 31, 2022 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 649,208 $ 649,208 $ 854,773 $ 854,773 Marketable securities 209,833 209,833 150,389 150,389 Derivative assets — — 86 86 Liabilities Derivative liabilities 1,980 1,980 4,215 4,215 Convertible debt 35,109 119,586 50,115 139,007
Schedule of Available-for-Sale Marketable Securities	The following table summarizes the composition of available-for-sale April 2, 2023 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) U.S. Treasury securities $ 55,615 $ 38 $ (3,485 ) $ 52,168 $ 49,669 Corporate debt securities 56,040 41 (4,712 ) 51,369 49,131 Commercial paper 47,225 337 (14 ) 47,548 16,845 U.S. government agency securities 7,427 9 (42 ) 7,394 4,419 Debt mutual funds 7,130 — (330 ) 6,800 3,312 Certificates of deposit and time deposits 1,754 — — 1,754 — Non-U.S. 554 — — 554 — $ 175,745 $ 425 $ (8,583 ) $ 167,587 $ 123,376 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 92,915 $ 337 $ (357 ) $ 92,895 $ 60,438 Long-term marketable securities 82,830 88 (8,226 ) 74,692 62,938 $ 175,745 $ 425 $ (8,583 ) $ 167,587 $ 123,376 The following table summarizes the composition of available-for-sale December 31, 2022 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Corporate debt securities $ 57,006 $ 3 $ (6,153 ) $ 50,856 $ 50,667 U.S. Treasury securities 44,030 — (4,381 ) 39,649 39,649 Commercial paper 7,089 70 — 7,159 — Debt mutual funds 6,997 — (417 ) 6,580 3,095 U.S. government agency securities 6,442 — (90 ) 6,352 6,352 Certificates of deposit and time deposits 1,740 — — 1,740 — Non-U.S. 535 — — 535 — $ 123,839 $ 73 $ (11,041 ) $ 112,871 $ 99,763 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 39,950 $ 70 $ (408 ) $ 39,612 $ 30,713 Long-term marketable securities 83,889 3 (10,633 ) 73,259 69,050 $ 123,839 $ 73 $ (11,041 ) $ 112,871 $ 99,763
Contractual Maturities of Investments Held	The contractual maturities of investments in available-for-sale April 2, 2023 Cost Fair Market Value (in thousands) Due within one year $ 92,915 $ 92,895 Due after 1 year through 5 years 31,721 30,672 Due after 5 years through 10 years 5,022 4,612 Due after 10 years 38,957 32,608 Total $ 168,615 $ 160,787
Schedule of Notional Amount of Derivatives	At April 2, 2023 and December 31, 2022, Teradyne had the following contracts to buy and sell non-U.S. non-U.S. April 2, 2023 December 31, 2022 Buy Position Sell Position Net Total Buy Position Sell Position Net Total (in millions) Japanese Yen $ (57.7 ) $ — $ (57.7 ) $ (37.1 ) $ — $ (37.1 ) Taiwan Dollar (38.3 ) — (38.3 ) (29.2 ) — (29.2 ) Korean Won (3.1 ) — (3.1 ) (6.4 ) — (6.4 ) British Pound Sterling (1.2 ) — (1.2 ) (1.2 ) — (1.2 ) Singapore Dollar — 35.7 35.7 — 33.5 33.5 Euro — 24.3 24.3 — 38.4 38.4 Philippine Peso — 2.5 2.5 — 2.7 2.7 Chinese Yuan — 1.9 1.9 — 2.2 2.2 Total $ (100.3 ) $ 64.4 $ (35.9 ) $ (73.9 ) $ 76.8 $ 2.9
Schedule of Foreign Currency Cash Flow Hedges	At April 2, 2023 and December 31, 2022, Teradyne had the following cash flow hedge contracts to buy and sell non-U.S. April 2, 2023 December 31, 2022 Buy Position Sell Position Net Total Buy Position Sell Position Net Total (in millions) Japanese Yen $ (13.6 ) $ 30.2 $ 16.6 $ (23.4 ) $ 61.2 $ 37.8 Taiwan Dollar — — — (5.5 ) 10.9 5.4 Total $ (13.6 ) $ 30.2 $ 16.6 $ (28.9 ) $ 72.1 $ 43.2
Schedule of Derivative Instruments in Statement of Financial Position at Fair Value	The following table summarizes the fair value of derivative instruments as of April 2, 2023 and December 31, 2022: Balance Sheet Location April 2, 2023 December 31, 2022 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Prepayments $ — $ 86 Foreign exchange forward contracts Other current liabilities (1,057 ) (990 ) Derivatives designated as hedging instruments: Foreign exchange option contracts Other current liabilities (923 ) (3,225 ) Total derivatives $ (1,980 ) $ (4,129 )
Schedule of Effect of Derivative Instruments on Statement of Operations Recognized	The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three months ended April 2, 2023 and April 3, 2022: For the Three Months Ended Location of Losses (Gains) Recognized in Statement of Operations April 2, 2023 April 3, 2022 (in thousands) Derivatives not designated as hedging instruments: Foreign exchange forward contracts Other (income) expense, net $ 1,259 $ (1,752 ) Derivatives designated as hedging instruments: Foreign exchange option contracts Revenue 1,538 — Total Derivatives $ 2,797 $ (1,752 )

Debt (Tables)

Debt (Tables)	3 Months Ended
	Apr. 02, 2023
Components of Convertible Senior Notes	The tables below represent the key components of Teradyne’s convertible senior notes: April 2, 2023 December 31, 2022 (in thousands) Debt principal $ 35,109 $ 50,228 Unamortized debt issuance fees — 113 Net carrying amount of convertible debt $ 35,109 $ 50,115 Teradyne’s convertible senior notes were reported as current debt at April 2, 2023 and December 31, 2022. The interest expense on Teradyne’s convertible senior notes for the three months ended April 2, 2023 and April 3, 2022 was as follows: For the Three Months Ended April 2, 2023 April 3, 2022 (in thousands) Contractual interest expense on the coupon $ 138 $ 311 Amortization of the issue fees recognized as interest expense 113 66 Total interest expense on the convertible debt $ 251 $ 377

Prepayments (Tables)

Prepayments (Tables)	3 Months Ended
	Apr. 02, 2023
Prepayments [Abstract]
Schedule of Prepayments and other assets	Prepayments consist of the following: April 2, 2023 December 31, 2022 (in thousands) Contract manufacturer and supplier prepayments $ 494,849 $ 491,105 Prepaid taxes 22,677 18,625 Prepaid maintenance and other services 16,591 14,545 Other prepayments 14,997 8,687 Total prepayments $ 549,114 $ 532,962

Product Warranty (Tables)

Product Warranty (Tables)	3 Months Ended
	Apr. 02, 2023
Other Accrued Liabilities	Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities. For the Three Months Ended April 2, 2023 April 3, 2022 (in thousands) Balance at beginning of period $ 14,181 $ 24,577 Accruals for warranties issued during the period 4,117 4,100 Accruals related to pre-existing (405 ) (2,758 ) Settlements made during the period (4,992 ) (5,814 ) Balance at end of period $ 12,901 $ 20,105
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances	Related costs are expensed as incurred. The balance below is included in short and long-term deferred revenue and customer advances. For the Three Months Ended April 2, 2023 April 3, 2022 (in thousands) Balance at beginning of period $ 56,180 $ 64,168 Deferral of new extended warranty revenue 4,413 11,774 Recognition of extended warranty deferred revenue (11,250 ) (10,216 ) Balance at end of period $ 49,343 $ 65,726

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 02, 2023
Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions	The fair value was estimated using the Monte Carlo simulation model with the following assumptions: For the Three Months Ended April 2, 2023 April 3, 2022 Risk-free interest rate 3.9 % 1.4 % Teradyne volatility-historical 50.2 % 47.1 % NYSE Composite Index volatility-historical 24.8 % 22.7 % Dividend yield 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: For the Three Months Ended April 2, 2023 April 3, 2022 Expected life (years) 4.0 4.0 Risk-free interest rate 3.7 % 1.6 % Volatility-historical 46.7 % 43.7 % Dividend yield 0.4 % 0.4 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Apr. 02, 2023
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following: Foreign Currency Translation Adjustment Unrealized Marketable Securities Unrealized Retirement Plans Service Credit Total (in thousands) Three Months Ended April 2, 2023 Balance at December 31, 2022, net of tax of $0, $(2,308), $(708), $(1,130), respectively $ (39,849 ) $ (8,661 ) $ (2,517 ) $ 1,159 $ (49,868 ) Other comprehensive gain before reclassifications, net of tax of $0, $503, $167, $0, respectively 9,309 2,294 596 — 12,199 Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $2, $338, $0, respectively — 5 1,200 (2 ) 1,203 Net current period other comprehensive gain (loss), net of tax of $0, $505, $505 $0, respectively 9,309 2,299 1,796 (2 ) 13,402 Balance at April 2, 2023, net of tax of $0, $(1,803), $(203), $(1,130) respectively $ (30,540 ) $ (6,362 ) $ (721 ) $ 1,157 $ (36,466 ) Three Months Ended April 3, 2022 Balance at December 31, 2021, net of tax of $0, $1,055, $0, $(1,128), respectively $ (10,818 ) $ 3,704 $ — $ 1,166 $ (5,948 ) Other comprehensive loss before reclassifications, net of tax of $0, $(1,333), $0, $0, respectively (8,076 ) (5,388 ) — — (13,464 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(18), $0, $0, respectively — (65 ) — (2 ) (67 ) Net current period other comprehensive loss, net of tax of $0, $(1,351), $0, $0, respectively (8,076 ) (5,453 ) — (2 ) (13,531 ) Balance at April 3, 2022, net of tax of $0, $(296), $0, $(1,128), respectively $ (18,894 ) $ (1,749 ) $ — $ 1,164 $ (19,479 )
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations	Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended April 2, 2023 and April 3, 2022, were as follows: Details about Accumulated Other Comprehensive Income (Loss) Components For the Three Months Ended Affected Line Item in the Statements of Operations April 2, April 3, 2023 2022 (in thousands) Available-for-sale Unrealized (losses) gains, net of tax of $(2) and $18, respectively $ (5 ) $ 65 Other (income) Cash flow hedges: Unrealized losses, net of tax of $(338) and $0, respectively (1,200 ) — Revenue Defined benefit pension and postretirement plans: Amortization of prior service benefit, net of tax of $0 and $0, respectively 2 2 (a) Total reclassifications, net of tax of $(340) and $18, respectively $ (1,203 ) $ 67 Net income (a) The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note O

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets (Tables)	3 Months Ended
	Apr. 02, 2023
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the three months ended April 2, 2023, were as follows: Robotics Wireless Test Semiconductor Test System Test Total (in thousands) Balance at December 31, 2022 Goodwill $ 383,166 $ 361,819 $ 262,077 $ 158,699 $ 1,165,761 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) 383,166 7,976 1,537 10,516 403,195 Foreign currency translation adjustment 6,609 — 24 — 6,633 Balance at April 2, 2023 Goodwill 389,775 361,819 262,101 158,699 1,172,394 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) $ 389,775 $ 7,976 $ 1,561 $ 10,516 $ 409,828
Schedule of Amortizable Intangible Assets	Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet: Gross Carrying Amount Accumulated Amortization Foreign Currency Translation Adjustment Net Carrying Amount (in thousands) Balance at April 2, 2023 Developed technology $ 270,967 $ (237,269 ) $ (5,560 ) $ 28,138 Customer relationships 57,739 (51,756 ) 184 6,167 Tradenames and trademarks 59,387 (43,101 ) (1,345 ) 14,941 Total intangible assets $ 388,093 $ (332,126 ) $ (6,721 ) $ 49,246 Balance, December 31, 2022 Developed technology $ 270,967 $ (234,208 ) $ (5,935 ) $ 30,824 Customer relationships 57,739 (51,186 ) 172 6,725 Tradenames and trademarks 59,387 (41,930 ) (1,528 ) 15,929 Total intangible assets $ 388,093 $ (327,324 ) $ (7,291 ) $ 53,478
Schedule of Estimated Intangible Assets Amortization Expense	Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter is as follows: Year Amortization Expense (in thousands) 2023 $ 14,219 2024 18,749 2025 11,320 2026 2,371 2027 1,155 Thereafter 1,432

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Apr. 02, 2023
Computation of Basic and Diluted Net Income (Loss) Per Common Share	The following table sets forth the computation of basic and diluted net income per common share: For the Three Months Ended April 2, April 3, 2023 2022 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 83,531 $ 161,928 Weighted average common shares-basic 155,904 162,048 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 8,983 10,028 Incremental shares from assumed conversion of convertible notes (2) 914 2,541 Restricted stock units 453 875 Stock options 48 69 Employee stock purchase plan 6 14 Dilutive potential common shares 10,404 13,527 Weighted average common shares-diluted 166,308 175,575 Net income per common share-basic $ 0.54 $ 1.00 Net income per common share-diluted $ 0.50 $ 0.92 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. (2) Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Apr. 02, 2023
Defined Benefit Pension Plans
Net Periodic Pension and Postretirement Benefit Costs	For the three months ended April 2, 2023 and April 3, 2022, Teradyne’s net periodic pension cost was comprised of the following: For the Three Months Ended April 2, 2023 April 3, 2022 United States Foreign United States Foreign (in thousands) Service cost $ 272 $ 109 $ 397 $ 206 Interest cost 1,711 262 1,222 118 Expected return on plan assets (1,285 ) (9 ) (732 ) (20 ) Total net periodic pension cost $ 698 $ 362 $ 887 $ 304
Postretirement Benefit Plans
Net Periodic Pension and Postretirement Benefit Costs	For the three months ended April 2, 2023 and April 3, 2022, Teradyne’s net periodic postretirement benefit cost was comprised of the following: For the Three Months Ended April 2, April 3, 2023 2022 (in thousands) Service cost $ 9 $ 17 Interest cost 61 44 Amortization of prior service credit (2 ) (2 ) Total net periodic postretirement benefit cost $ 68 $ 59

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Apr. 02, 2023
Segment Information	Segment information for the three months ended April 2, 2023 and April 3, 2022 is as follows: Semiconductor Test System Test Robotics Wireless Test Corporate and Eliminations Consolidated (in thousands) Three Months Ended April 2, 2023 Revenues $ 415,009 $ 74,631 $ 89,214 $ 38,675 $ — $ 617,529 Income (loss) before income taxes (1)(2) 96,185 15,275 (18,490 ) 9,352 (5,238 ) 97,084 Total assets (3) 1,386,851 173,669 676,092 87,875 1,058,920 3,383,407 Three Months Ended April 3, 2022 Revenues $ 482,341 $ 118,668 $ 103,189 $ 51,518 $ (346 ) $ 755,370 Income (loss) before income taxes (1)(2) 149,705 41,322 (5,098 ) 18,619 (24,189 ) 180,359 Total assets (3) 1,296,070 187,283 675,560 113,821 1,336,420 3,609,154 (1) Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, legal and environmental fees, severance charges, acquisition related charges and compensation and an expense for the modification of Teradyne’s former chief executive officer’s outstanding equity awards. (2) Included in income (loss) before taxes are charges related to restructuring and other, and inventory charges. (3) Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.
Schedule of Segment Reporting Information by Segment Charges	Included in each segment are charges and credits in the following line items in the statements of operations: For the Three Months Ended April 2, April 3, 2023 2022 (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ 3,768 $ — Restructuring and other—employee severance 794 — System Test: Cost of revenues—inventory charge $ 675 — Robotics: Cost of revenues—inventory charge $ 782 $ — Wireless: Cost of revenues—inventory charge $ — $ 877 Corporate and Other: Selling and administrative - equity modification charge $ 5,889 $ — Restructuring and other—employee severance 659 — Restructuring and other—legal settlement charge — 14,700

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Deferred Revenue And Customer Advances	$ 50.7	$ 35
Trade Accounts Receivable	34.2	$ 19.4
Revenue, Remaining Performance Obligation, Amount	$ 1,240.7
Short-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	88%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	12 months
Long-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	12%
Long-term Contract with Customer [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	3 years
Long-term Contract with Customer [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	1 year

Disaggregated Revenue by Primar

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 02, 2023	Apr. 03, 2022
Disaggregation of Revenue [Line Items]
Total	[1]	$ 617,529	$ 755,370
Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		415,009	482,341
System Test
Disaggregation of Revenue [Line Items]
Total	[1]	74,631	118,668
Robotics
Disaggregation of Revenue [Line Items]
Total		89,214	103,189
Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	38,675	51,518
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	0	(346)
Point in Time
Disaggregation of Revenue [Line Items]
Total	[1]	512,741	665,476
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	56,857	105,288
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	35,363	48,429
Point in Time | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	0	(346)
Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	104,788	89,894
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	17,774	13,380
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	3,312	3,089
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	424,494	563,835
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	39,590	73,784
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	23,231	34,946
Americas
Disaggregation of Revenue [Line Items]
Total	[1]	118,591	114,421
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	28,980	36,608
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	12,846	9,687
Americas | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	0	(346)
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	74,444	77,114
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	6,061	8,276
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	2,598	6,885
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	346,834	386,585
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	273,275	323,456
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	73,559	63,129
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	283,259	340,741
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	41,568	29,714
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	22,007	16,130
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	68,175	95,756
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	61,258	88,723
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	6,917	7,033
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	63,695	93,151
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	2,944	2,046
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	1,536	559
Universal Robots (UR) | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	72,037	85,284
Universal Robots (UR) | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	70,029	83,182
Universal Robots (UR) | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	2,008	2,102
Universal Robots (UR) | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	13,217	18,621
Universal Robots (UR) | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	20,447	28,148
Universal Robots (UR) | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	38,373	38,515
MiR | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	17,177	17,905
MiR | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	15,959	16,744
MiR | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	1,218	1,161
MiR | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	1,502	2,592
MiR | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	11,806	8,564
MiR | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	[1]	$ 3,869	$ 6,749
[1]Includes $1.3 million and $2.3 million in 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

Disaggregated Revenue by Prim_2

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Accounting Policies [Abstract]
Revenue on leases	$ 1.3	$ 2.3

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022	Apr. 03, 2022	Dec. 31, 2021
Deferred Revenue Arrangement
Maintenance, service and training	$ 70,609	$ 78,089
Extended warranty	49,343	56,180	$ 65,726	$ 64,168
Customer advances, undelivered elements and other	41,200	59,147
Total deferred revenue and customer advances	$ 161,152	$ 193,416

Composition of Inventories, Net

Composition of Inventories, Net (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw material	$ 264,035	$ 256,065
Work-in-process	43,987	37,982
Finished goods	44,036	30,972
Inventories, net	$ 352,058	$ 325,019

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Apr. 02, 2023	Dec. 31, 2022
Inventory [Line Items]
Inventory reserves	$ 138.6	$ 136.8

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 02, 2023	Apr. 03, 2022	Dec. 31, 2022
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain	$ 300	$ 400
Available-for-sale securities, realized loss	100	200
Fair market value of investments with unrealized losses greater than one year	55,000		$ 33,400
Fair market value of investments with unrealized losses less than one year	68,400		66,300
Unrealized Gain (loss) on contracts	400	4,300
Equity securities unrealized gain	2,000
Equity securities unrealized loss		2,200
Other comprehensive income (Loss), cash flow hedge, gain (loss), before reclassification, after tax	596	$ 0
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		3,200
Debt Mutual Funds
Financial Instruments and Fair Value [Line Items]
Available for sale securities with out contractual maturity date	6,800
Foreign Exchange Contracts
Financial Instruments and Fair Value [Line Items]
Unrealized Gain (loss) on contracts	$ 1,100		$ 900

Schedule of Fair Value of Finan

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 167,587	$ 112,871
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	52,168	39,649
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	51,369	50,856
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	47,548	7,159
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,394	6,352
Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	6,800	6,580
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,754	1,740
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	554	535
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	859,041	1,005,162
Derivative assets		86
Total	859,041	1,005,248
Derivative liabilities	1,980	4,215
Total	1,980	4,215
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	244,542	632,417
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	404,666	222,356
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	52,168	39,649
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	51,369	50,856
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	47,548	7,159
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,394	6,352
Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	6,800	6,580
Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,754	1,740
Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	554	535
Fair Value, Measurements, Recurring | Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	42,246	37,518
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	545,962	838,282
Derivative assets		0
Total	545,962	838,282
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	244,542	632,417
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	252,374	161,767
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 | Commercial Paper
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 | 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 | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	6,800	6,580
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 | 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	42,246	37,518
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	313,079	166,880
Derivative assets		86
Total	313,079	166,966
Derivative liabilities	1,980	4,215
Total	1,980	4,215
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	152,292	60,589
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	52,168	39,649
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	51,369	50,856
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	47,548	7,159
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	7,394	6,352
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 | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,754	1,740
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	554	535
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
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 | Commercial Paper
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 | 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 | 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 | 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	Apr. 02, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 859,041	$ 1,005,248
Liabilities	1,980	4,215
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,980	4,215
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	649,208	854,773
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	92,895	39,612
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	116,938	110,777
Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets		86
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	545,962	838,282
Liabilities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	496,916	794,184
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	49,046	44,098
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	313,079	166,966
Liabilities	1,980	4,215
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	1,980	4,215
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	152,292	60,589
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	92,895	39,612
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	67,892	66,679
Significant Other Observable Inputs (Level 2) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets		86
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 0	0
Significant Unobservable Inputs (Level 3) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets		$ 0

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities	$ 167,587	$ 112,871
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	649,208	854,773
Marketable securities	209,833	150,389
Derivative assets	0	86
Derivative liabilities	1,980	4,215
Convertible debt	$ 35,109	$ 50,115
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	$ 649,208	$ 854,773
Marketable securities	209,833	150,389
Derivative assets	0	86
Derivative liabilities	1,980	4,215
Convertible debt	$ 119,586	$ 139,007
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	Apr. 02, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 175,745	$ 123,839
Available-for-sale marketable securities, Unrealized Gain	425	73
Available-for-sale marketable securities, Unrealized (Loss)	(8,583)	(11,041)
Available-for-sale marketable securities, Fair Market Value	167,587	112,871
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	123,376	99,763
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	55,615	44,030
Available-for-sale marketable securities, Unrealized Gain	38
Available-for-sale marketable securities, Unrealized (Loss)	(3,485)	(4,381)
Available-for-sale marketable securities, Fair Market Value	52,168	39,649
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	49,669	39,649
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	56,040	57,006
Available-for-sale marketable securities, Unrealized Gain	41	3
Available-for-sale marketable securities, Unrealized (Loss)	(4,712)	(6,153)
Available-for-sale marketable securities, Fair Market Value	51,369	50,856
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	49,131	50,667
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	47,225	7,089
Available-for-sale marketable securities, Unrealized Gain	337	70
Available-for-sale marketable securities, Unrealized (Loss)	(14)
Available-for-sale marketable securities, Fair Market Value	47,548	7,159
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	16,845
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	7,427	6,442
Available-for-sale marketable securities, Unrealized Gain	9
Available-for-sale marketable securities, Unrealized (Loss)	(42)	(90)
Available-for-sale marketable securities, Fair Market Value	7,394	6,352
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	4,419	6,352
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	7,130	6,997
Available-for-sale marketable securities, Unrealized (Loss)	(330)	(417)
Available-for-sale marketable securities, Fair Market Value	6,800	6,580
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,312	3,095
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,754	1,740
Available-for-sale marketable securities, Fair Market Value	1,754	1,740
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	554	535
Available-for-sale marketable securities, Fair Market Value	$ 554	$ 535

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 175,745	$ 123,839
Available-for-sale marketable securities, Unrealized Gain	425	73
Available-for-sale marketable securities, Unrealized (Loss)	(8,583)	(11,041)
Available-for-sale marketable securities, Fair Market Value	167,587	112,871
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	123,376	99,763
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	92,915	39,950
Available-for-sale marketable securities, Unrealized Gain	337	70
Available-for-sale marketable securities, Unrealized (Loss)	(357)	(408)
Available-for-sale marketable securities, Fair Market Value	92,895	39,612
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	60,438	30,713
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	82,830	83,889
Available-for-sale marketable securities, Unrealized Gain	88	3
Available-for-sale marketable securities, Unrealized (Loss)	(8,226)	(10,633)
Available-for-sale marketable securities, Fair Market Value	74,692	73,259
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 62,938	$ 69,050

Contractual Maturities of Inves

Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Apr. 02, 2023 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 92,915
Due after 1 year through 5 years, cost	31,721
Due after 5 years through 10 years, cost	5,022
Due after 10 years, cost	38,957
Total, cost	168,615
Due within one year, fair market value	92,895
Due after 1 year through 5 years, fair market value	30,672
Due after 5 years through 10 years, fair market value	4,612
Due after 10 years, fair maket value	32,608
Total, fair market value	$ 160,787

Schedule of Notional Amount of

Schedule of Notional Amount of Derivatives (Detail) - USD ($) $ in Millions	Apr. 02, 2023	Dec. 31, 2022
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	$ (35.9)
Derivative Asset, Notional amounts		$ 2.9
Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(100.3)	(73.9)
Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	64.4	76.8
Japanese Yen
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(57.7)	(37.1)
Japanese Yen | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(57.7)	(37.1)
Taiwan Dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(38.3)	(29.2)
Taiwan Dollar | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(38.3)	(29.2)
Korean Won
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(3.1)	(6.4)
Korean Won | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(3.1)	(6.4)
British Pound Sterling
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(1.2)	(1.2)
British Pound Sterling | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(1.2)	(1.2)
Singapore Dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	35.7	33.5
Singapore Dollar | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	35.7	33.5
Euro
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	24.3	38.4
Euro | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	24.3	38.4
Philippines, Pesos
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	2.5	2.7
Philippines, Pesos | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	2.5	2.7
China, Yuan Renminbi
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	1.9	2.2
China, Yuan Renminbi | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 1.9	$ 2.2

Schedule Of Foreign Currency Ca

Schedule Of Foreign Currency Cash Flow Hedges (Detail) - USD ($) $ in Millions	Apr. 02, 2023	Dec. 31, 2022
Derivative Asset, Notional amounts		$ 2.9
Derivative Liability, Notional amounts	$ (35.9)
Japan, Yen
Derivative Liability, Notional amounts	(57.7)	(37.1)
Taiwan, New Dollars
Derivative Liability, Notional amounts	(38.3)	(29.2)
Short [Member]
Derivative Asset, Notional amounts	64.4	76.8
Long [Member]
Derivative Liability, Notional amounts	(100.3)	(73.9)
Long [Member] | Japan, Yen
Derivative Liability, Notional amounts	(57.7)	(37.1)
Long [Member] | Taiwan, New Dollars
Derivative Liability, Notional amounts	(38.3)	(29.2)
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	16.6	43.2
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Japan, Yen
Derivative, Notional Amount	16.6	37.8
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Taiwan, New Dollars
Derivative, Notional Amount	0	5.4
Foreign Exchange Forward [Member] | Short [Member] | Cash Flow Hedging [Member]
Derivative Asset, Notional amounts	30.2	72.1
Foreign Exchange Forward [Member] | Short [Member] | Cash Flow Hedging [Member] | Japan, Yen
Derivative Asset, Notional amounts	30.2	61.2
Foreign Exchange Forward [Member] | Short [Member] | Cash Flow Hedging [Member] | Taiwan, New Dollars
Derivative Asset, Notional amounts	0	10.9
Foreign Exchange Forward [Member] | Long [Member] | Cash Flow Hedging [Member]
Derivative Liability, Notional amounts	(13.6)	(28.9)
Foreign Exchange Forward [Member] | Long [Member] | Cash Flow Hedging [Member] | Japan, Yen
Derivative Liability, Notional amounts	(13.6)	(23.4)
Foreign Exchange Forward [Member] | Long [Member] | Cash Flow Hedging [Member] | Taiwan, New Dollars
Derivative Liability, Notional amounts	$ 0	$ (5.5)

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ (1,980)	$ (4,129)
Not Designated as Hedging Instrument | Foreign currency forward contracts | Prepayments
Derivatives, Fair Value [Line Items]
Derivative assets	0	86
Not Designated as Hedging Instrument | Foreign currency forward contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(1,057)	(990)
Designated as Hedging Instrument [Member] | Foreign Exchange Option [Member] | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (923)	$ (3,225)

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 2,797	$ (1,752)
Other (income) expense, net | Not Designated as Hedging Instrument [Member] | Foreign Exchange Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Losses (Gains) on derivatives recognized in statements of operations	1,259	(1,752)
Sales [Member] | 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	$ 1,538	$ 0

Debt - Additional Information (

Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Dec. 12, 2016 USD ($) Day $ / shares shares	Apr. 02, 2023 USD ($) $ / shares shares	Apr. 03, 2022 USD ($)	May 05, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 05, 2022 USD ($)	Jan. 01, 2022 USD ($)	May 01, 2020 USD ($)
Debt Instrument
Repurchase of common stock		$ 93,308	$ 201,465
Trading days measurement period | Day	5
Debt issuance costs, amortization period		7 years
Line of Credit Facility, Maximum Borrowing Capacity						$ 750,000		$ 400,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		$ 200,000
Line of Credit Facility, Interest Rate Description		The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or SOFR plus a margin ranging from 1.10% to 1.85% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.
Term of revolving credit facility								3 years
Expected principal interest payments in next 12 months		$ 400
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA		15%
Current debt, Conversion		$ 35,109			$ 50,115
Retained earnings		694,145			$ 725,729
Convertible Common Shares [Member]
Debt Instrument
Mezzanine equity		$ 2,300
Subsequent Event
Debt Instrument
Long-Term Debt				$ 427,200
Collateral Pledged [Member]
Debt Instrument
Line of Credit Facility, Interest Rate Description		65
1.25% Convertible Senior Unsecured Notes Due December 15, 2023
Debt Instrument
Aggregate principal amount	$ 460,000	$ 460,000
Debt instrument, interest rate, stated percentage	1.25%
Debt instrument, net proceeds after issuance costs	$ 450,800
Payment for net cost of convertible note hedges net of warrant proceeds	33,000	$ 33,000
Repurchase of common stock	$ 50,100
Repurchase of stock, shares | shares	2
Senior notes maturity date	Dec. 15, 2023
Debt instrument, frequency of periodic payment	payable semiannually in arrears on June 15 and December 15 of each year
Debt instrument, date of first required payment	Mar. 31, 2017
Debt instrument, conversion option expiration date	Sep. 15, 2023
Consecutive trading days measurement period | Day	5
Debt instrument conversion price | $ / shares	$ 31.44	$ 31.44
Shares that would be issued upon conversion | shares		14.6
Strike price per share of warrant | $ / shares		$ 39.46
Debt instrument, convertible, carrying amount of equity component		$ 100,800
Value of notes converted		$ 120,000
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option one
Debt Instrument
Trading days measurement period | Day	20
Consecutive trading days measurement period | Day	30
Percentage of conversion price	130%
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option two
Debt Instrument
Aggregate principal amount	$ 1,000
Percentage of closing sale price of common stock and conversion rate product	98%
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%
Teradyne [Member]
Debt Instrument
Mezzanine equity							$ 100,800
Current debt, Conversion							1,400
Debt							6,600
Retained earnings							94,600
Teradyne [Member] | Accounting Standards Update 2020-06 [Member]
Debt Instrument
Deferred Tax Assets, Other							1,800
Teradyne [Member] | Accounting Standards Update 2020-06 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Debt Instrument
Mezzanine equity							$ 0

Components of Convertible Senio

Components of Convertible Senior Notes (Detail) - Convertible Senior Notes [Member] - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Debt Instrument
Debt principal	$ 35,109	$ 50,228
Unamortized debt issuance fees	0	113
Net carrying amount of convertible debt	$ 35,109	$ 50,115

Interest Expense on Convertible

Interest Expense on Convertible Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Debt Instrument
Contractual interest expense on the coupon	$ 138	$ 311
Amortization of the issue fees recognized as interest expense	113	66
Total interest expense on the convertible debt	$ 251	$ 377

Schedule of Prepayments and Oth

Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands	Apr. 02, 2023	Dec. 31, 2022
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments	$ 494,849	$ 491,105
Prepaid taxes	22,677	18,625
Prepaid maintenance and other services	16,591	14,545
Other prepayments	14,997	8,687
Total prepayments	$ 549,114	$ 532,962

Warranty Accrual Included in Ot

Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 14,181	$ 24,577
Accruals for warranties issued during the period	4,117	4,100
Accruals related to pre-existing warranties	(405)	(2,758)
Settlements made during the period	(4,992)	(5,814)
Balance at end of period	$ 12,901	$ 20,105

Extended Product Warranty of Sh

Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 56,180	$ 64,168
Deferral of new extended warranty revenue	4,413	11,774
Recognition of extended warranty deferred revenue	(11,250)	(10,216)
Balance at end of period	$ 49,343	$ 65,726

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Stock price	$ 103.44	$ 112.12
Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Stock Based Compensation Relating To Retirement Agreement	$ 5.9
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of common stock price paid	100%
Stock Options | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	7 years
Stock Options | Measurement Input, Expected Dividend Payment [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Estimated annual dividend amount per share	$ 0.44	0.44
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	4 years
Percentage of awards vesting on the first anniversary of grant date	100%
Restricted Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	1 year
TSR Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period	3 years
Minimum years of service for retirement to be eligible for PRSUs	10 years
Restricted stock unit awards granted	0.1
Weighted average grant date fair value of restricted stock units granted	$ 137.64	101.06
Stock price	103.44	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	$ 0.44	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 | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal installments	4 years
PBIT Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1
Weighted average grant date fair value of restricted stock units granted	$ 102.23	$ 110.84
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.5	0.4
Weighted average grant date fair value of restricted stock units granted	$ 102.36	$ 111.31
Service-Based Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.1
Service Based Stock Options | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of restricted stock units granted	$ 40.9	$ 39.01

Schedule of Estimated Fair Valu

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions (Detail) - TSR Performance-Based Restricted Stock Units	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	3.90%	1.40%
Expected historical volatility	50.20%	47.10%
Dividend yield	0.40%	0.40%
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	24.80%	22.70%

Schedule of Estimated Fair Va_2

Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Stock Options	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	4 years	4 years
Risk-free interest rate	3.70%	1.60%
Volatility-historical	46.70%	43.70%
Dividend yield	0.40%	0.40%

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,451,294	$ 2,562,444
Other comprehensive income (loss)	13,402	(13,531)
Balance	2,449,462	2,474,532
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(39,849)	(10,818)
Other comprehensive loss before reclassifications, net of tax	9,309	(8,076)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive income (loss)	9,309	(8,076)
Balance	(30,540)	(18,894)
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,661)	3,704
Other comprehensive loss before reclassifications, net of tax	2,294	(5,388)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	5	(65)
Other comprehensive income (loss)	2,299	(5,453)
Balance	(6,362)	(1,749)
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,517)	0
Other comprehensive loss before reclassifications, net of tax	596	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	1,200	0
Other comprehensive income (loss)	1,796	0
Balance	(721)	0
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,159	1,166
Other comprehensive loss before reclassifications, net of tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(2)	(2)
Other comprehensive income (loss)	(2)	(2)
Balance	1,157	1,164
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(49,868)	(5,948)
Other comprehensive loss before reclassifications, net of tax	12,199	(13,464)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	1,203	(67)
Other comprehensive income (loss)	13,402	(13,531)
Balance	$ (36,466)	$ (19,479)

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ 340	$ (18)
Foreign currency translation adjustments, tax	0	0	$ 0	$ 0
Unrealized (losses) gains on marketable securities, tax	(1,803)	(296)	(2,308)	1,055
Unrealized (Losses) Gains on Cash Flow Hedges	(203)	0	(708)	0
Retirement plans prior service benefit, tax	(1,130)	(1,128)	$ (1,130)	$ (1,128)
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	503	(1,333)
Amounts reclassified from accumulated other comprehensive income (loss), tax	2	(18)
Other comprehensive income (loss), tax	505	(1,351)
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	167	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	338	0
Other comprehensive income (loss), tax	505	0
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	0	0
Other comprehensive income (loss), tax	$ 0	$ 0

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	$ (5)	$ 65
Unrealized losses, net of tax of $(338) and $0, respectively	(1,200)	0
Unrealized Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	(5)	65
Reclassifications, net of tax	(5)	65
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	2	2
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	$ (1,203)	$ 67

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ (338)	$ 0
Reclassifications, tax	(340)	18
Unrealized (Losses) Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	(2)	18
Amortization of Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 0	$ 0

Goodwill and Acquired Intangi_3

Goodwill and Acquired Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired intangible assets amortization	$ 4,802	$ 5,063

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Apr. 02, 2023
Goodwill [Line Items]
Goodwill	$ 1,165,761	$ 1,172,394
Accumulated impairment losses	(762,566)	(762,566)
Foreign currency translation adjustment	6,633
Total Goodwill	403,195	409,828
Robotics
Goodwill [Line Items]
Goodwill	383,166	389,775
Foreign currency translation adjustment	6,609
Total Goodwill	383,166	389,775
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses	(353,843)	(353,843)
Foreign currency translation adjustment	0
Total Goodwill	7,976	7,976
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,077	262,101
Accumulated impairment losses	(260,540)	(260,540)
Foreign currency translation adjustment	24
Total Goodwill	1,537	1,561
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses	(148,183)	(148,183)
Foreign currency translation adjustment	0
Total Goodwill	$ 10,516	$ 10,516

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 02, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 388,093	$ 388,093
Accumulated Amortization	(332,126)	(327,324)
Foreign Currency Translation Adjustment	(6,721)	(7,291)
Net Carrying Amount	49,246	53,478
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	270,967	270,967
Accumulated Amortization	(237,269)	(234,208)
Foreign Currency Translation Adjustment	(5,560)	(5,935)
Net Carrying Amount	28,138	30,824
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	57,739	57,739
Accumulated Amortization	(51,756)	(51,186)
Foreign Currency Translation Adjustment	184	172
Net Carrying Amount	6,167	6,725
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	59,387	59,387
Accumulated Amortization	(43,101)	(41,930)
Foreign Currency Translation Adjustment	(1,345)	(1,528)
Net Carrying Amount	$ 14,941	$ 15,929

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Apr. 02, 2023 USD ($)
Finite-Lived Intangible Assets
2023	$ 14,219
2024	18,749
2025	11,320
2026	2,371
2027	1,155
Thereafter	$ 1,432

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Employee Stock Option [Member]
Net Income Loss Per Common Share
Exercise of stock options	0.5
Restricted Stock Units (RSUs) [Member]
Net Income Loss Per Common Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0.1

Computation of Basic and Dilute

Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 02, 2023	Apr. 03, 2022
Net Income Loss Per Common Share
Net income for basic and diluted net income per share		$ 83,531	$ 161,928
Weighted average common shares-basic		155,904	162,048
Convertible note hedge warrant shares	[1]	8,983	10,028
Incremental shares from assumed conversion of convertible notes	[2]	914	2,541
Employee stock purchase rights		6	14
Dilutive potential common shares		10,404	13,527
Weighted average common shares-diluted		166,308	175,575
Net income per common share-basic		$ 0.54	$ 1
Net income per common share-diluted		$ 0.5	$ 0.92
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		453	875
Stock Options
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		48	69
[1]Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.[2]Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Mar. 25, 2022	Apr. 02, 2023	Apr. 03, 2022
Restructuring Cost and Reserve
Severance benefit and charges		$ 2
Settled Litigation [Member]
Restructuring Cost and Reserve
Legal settlement charges			$ 14.7
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) - USD ($)	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
U.S. Supplemental Executive Defined Benefit Pension Plan
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans	$ 800	$ 800
Non-United States Subsidiaries
Defined Benefit Plan Disclosure
Contribution to defined benefit pension plans in 2018	$ 200	$ 300

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
UNITED STATES
Defined Benefit Plan Disclosure
Service cost	$ 272	$ 397
Interest cost	1,711	1,222
Expected return on plan assets	(1,285)	(732)
Total net periodic postretirement benefit cost	698	887
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	109	206
Interest cost	262	118
Expected return on plan assets	(9)	(20)
Total net periodic postretirement benefit cost	362	304
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	9	17
Interest cost	61	44
Amortization of prior service credit	(2)	(2)
Total net periodic postretirement benefit cost	$ 68	$ 59

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 08, 2021	Mar. 31, 2022	Apr. 02, 2023	Dec. 31, 2022
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments			$ 589.7
Purchase commitments less than one year			530.7
Product warranty accrual			12.9	$ 14.2
Revenue deferrals related to extended warranties			$ 49.3	$ 56.2
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

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Aug. 16, 2022	Apr. 02, 2023	Apr. 03, 2022	Dec. 31, 2022
Income Taxes [Line Items]
Accrued interest and penalties		$ 0.4		$ 0.4
Interest and penalties related to income tax, expense (benefit)		0.1	$ 0.1
Uncertain tax positions		15.7		$ 15.6
Net increase in uncertain tax positions		$ 0.1
Percentage of alternative minimum tax	15%

Schedule of Reconciliation of E

Schedule of Reconciliation of Effective Tax Rate (Detail)	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	21%	21%
Non-deductible officers' compensation	0.90%	1.10%
Discrete benefit related to equity compensation	(3.30%)	(6.60%)
International provisions of the U.S. Tax Cuts and Jobs Act of 2017	(3.20%)	(1.30%)
Tax credits	(2.50%)	(1.60%)
Foreign taxes	(0.60%)	(3.40%)
Other, net	1.70%	1%
Effective tax rate, Total	14%	10.20%

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended
	Apr. 02, 2023 Segment
Segment Reporting Information [Line Items]
Operating segments	4

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 02, 2023		Apr. 03, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	[1]	$ 617,529		$ 755,370
Income (loss) before income taxes	[2],[3]	97,084		180,359
Total assets		3,383,407	[4]	3,609,154	[4]	$ 3,501,252
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		415,009		482,341
Income (loss) before income taxes	[2],[3]	96,185		149,705
Total assets	[4]	1,386,851		1,296,070
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	74,631		118,668
Income (loss) before income taxes	[2],[3]	15,275		41,322
Total assets	[4]	173,669		187,283
Robotics
Segment Reporting Information [Line Items]
Revenues		89,214		103,189
Income (loss) before income taxes	[2],[3]	(18,490)		(5,098)
Total assets	[4]	676,092		675,560
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	38,675		51,518
Income (loss) before income taxes	[2],[3]	9,352		18,619
Total assets	[4]	87,875		113,821
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues		0		(346)
Income (loss) before income taxes	[2],[3]	(5,238)		(24,189)
Total assets	[4]	$ 1,058,920		$ 1,336,420
[1]Includes $1.3 million and $2.3 million in 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”[2]Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, legal and environmental fees, severance charges, acquisition related charges and compensation and an expense for the modification of Teradyne’s former chief executive officer’s outstanding equity awards.[3]Included in income (loss) before taxes are charges related to restructuring and other, and inventory charges.[4]Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.

Schedule of Segment Reporting I

Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 2,037	$ 15,714
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	3,768	0
Restructuring and other—employee severance	794	0
System Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	675	0
Robotics
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	782	0
Restructuring and other—employee severance	659	0
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	877
Corporate and Other | Selling and administrative—equity modification charge
Segment Reporting Information [Line Items]
Selling and administrative—equity modification charge	5,889	0
Corporate and Other | Restructuring and other
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 0	$ 14,700

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Jan. 01, 2023	Apr. 02, 2023	Apr. 03, 2022	Jan. 31, 2023
Common stock average price		$ 104.88	$ 115.12
Dividends Payable, Amount Per Share				$ 0.11
Dividend payment		$ 17,165	$ 17,895
Percentage of excise tax on share repurchases in excess of issuances	1%
Cumulative repurchases, shares		0.9	1.8
Cumulative repurchases, value	$ 500,000	$ 93,700	$ 201,500	$ 2,000,000