Teradyne (TER) 10-Q 6 May 22 2022 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Apr. 03, 2022	May 02, 2022
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Fiscal Year Focus	2022
Entity Central Index Key	0000097210
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Document Period End Date	Apr. 3, 2022
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		160,203,017

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 03, 2022		Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 794,603		$ 1,122,199
Marketable securities	282,016		244,231
Accounts receivable, less allowance for credit losses of $1,891 and $2,012 at April 3, 2022 and December 31, 2021, respectively	546,881		550,749
Inventories, net	259,341		243,330
Prepayments	479,414		406,266
Other current assets	12,127		9,452
Total current assets	2,374,382		2,576,227
Property, plant and equipment, net	399,485		387,240
Operating lease right-of-use assets, net	67,718		68,807
Marketable securities	126,130		133,858
Deferred tax assets	113,556		102,428
Retirement plans assets	14,669		15,110
Other assets	23,480		24,096
Acquired intangible assets, net	69,846		75,635
Goodwill	419,888		426,024
Total assets	3,609,154	[1]	3,809,425
Current liabilities:
Accounts payable	156,493		153,133
Accrued employees' compensation and withholdings	139,287		253,667
Deferred revenue and customer advances	155,761		146,185
Other accrued liabilities	118,252		124,187
Operating lease liabilities	18,523		19,977
Income taxes payable	103,386		88,789
Current debt	20,497		19,182
Total current liabilities	712,199		805,120
Retirement plans liabilities	151,697		151,141
Long-term deferred revenue and customer advances	51,698		54,921
Long-term other accrued liabilities	15,748		15,497
Deferred tax liabilities	4,927		6,327
Long-term operating lease liabilities	55,934		56,178
Long-term incomes taxes payable	67,041		67,041
Debt	75,378		89,244
Total liabilities	1,134,622		1,245,469
Commitments and contingencies (Note Q)
Mezzanine equity:
Convertible common shares			1,512
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 161,053 and 162,251 shares issued and outstanding at April 3, 2022 and December 31, 2021, respectively	20,132		20,281
Additional paid-in capital	1,711,690		1,811,545
Accumulated other comprehensive loss	(19,479)		(5,948)
Retained earnings	762,189		736,566
Total shareholders' equity	2,474,532		2,562,444
Total liabilities and shareholders' equity	$ 3,609,154		$ 3,809,425
[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. 03, 2022	Dec. 31, 2021
Accounts receivable, less allowance for credit losses	$ 1,891	$ 2,012
Common stock, par value	$ 0.125	$ 0.125
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	161,053	162,251
Common stock, shares outstanding	161,053	162,251

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 03, 2022	Apr. 04, 2021
Revenues:
Total revenues	[1]	$ 755,370	$ 781,606
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		300,437	319,988
Gross profit		454,933	461,618
Operating expenses:
Selling and administrative		140,185	129,797
Engineering and development		108,116	100,402
Acquired intangible assets amortization		5,063	5,536
Restructuring and other		15,714	(7,130)
Total operating expenses		269,078	228,605
Income from operations		185,855	233,013
Non-operating (income) expense:
Interest income		(703)	(808)
Interest expense		1,012	6,004
Other (income) expense, net		5,187	3,824
Income before income taxes	[2],[3]	180,359	223,993
Income tax provision		18,431	18,481
Net income		$ 161,928	$ 205,512
Net income per common share:
Basic		$ 1	$ 1.23
Diluted		$ 0.92	$ 1.09
Weighted average common shares—basic		162,048	166,491
Weighted average common shares—diluted		175,575	187,740
Product [Member]
Revenues:
Total revenues		$ 625,875	$ 660,508
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		243,016	267,784
Service [Member]
Revenues:
Total revenues		129,495	121,098
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 57,421	$ 52,204
[1]	Includes $3.1 million and $3.1 million in 2022 and 2021, 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: legal fees, contingent consideration fair value adjustments, interest income, interest expense, severance charges, net foreign exchange gains (losses), acquisition related charges and compensation, intercompany eliminations and for the three months ended April 4, 2021, loss on convertible debt conversions.
[3]	Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and, for the three months ended April 4, 2021, loss on convertible debt conversions.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Net income	$ 161,928	$ 205,512
Other comprehensive income, net of tax:
Foreign currency translation adjustment, net of tax of $0 and $0, respectively	(8,076)	(21,123)
Available-for-sale marketable securities:
Unrealized losses on marketable securities arising during period, net of tax of $(1,333) and $(908), respectively	(5,388)	(3,270)
Less: Reclassification adjustment for gains included in net income, net of tax of $(18) and $(123), respectively	(65)	(444)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(5,453)	(3,714)
Defined benefit post-retirement plan:
Amortization of prior service credit, net of tax of $0 and $0, respectively	(2)	(2)
Other comprehensive (loss) income	(13,531)	(24,839)
Comprehensive income	$ 148,397	$ 180,673

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Foreign currency translation adjustment, net of tax	$ 0	$ 0
Unrealized (losses) gains on marketable securities arising during period	(1,333)	(908)
Reclassification adjustment for gains included in net income	(18)	(123)
Amortization of prior service credit, net of tax	$ 0	$ 0

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS'' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Convertible Common Shares	Common Stock	Common StockConvertible Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)
Balance at Dec. 31, 2020	$ 2,207,018		$ 20,765		$ 1,765,323	$ 33,516	$ 387,414
Balance, Shares at Dec. 31, 2020		3,787	166,123
Net issuance of common stock under stock-based plans	(13,987)		$ 84		(14,071)
Net issuance of common stock under stock-based plans (in shares)			670
Stock-based compensation expense	13,359				13,359
Repurchase of common stock	$ (47,188)		$ (47)				(47,141)
Repurchase of common stock (in shares)	400		(374)
Cash dividends	$ (16,682)						(16,682)
Settlements of convertible notes	157,682		$ 153		157,529
Settlement of convertible debt (in shares)			1,222
Exercise of convertible notes hedge call options	(158,876)		$ (153)		(158,723)
Exercise of convertible notes hedge call options (in shares)			(1,222)
Convertible common shares	2,554				2,554
Convertible common shares (in shares)		(2,554)
Net income	205,512						205,512
Other comprehensive income (loss)	(24,839)					(24,839)
Balance at Apr. 04, 2021	2,324,553		$ 20,802		1,765,971	8,677	529,103
Balance, Shares at Apr. 04, 2021		1,233	166,419
Balance at Dec. 31, 2021	2,562,444		$ 20,281	$ 1,512	1,811,545	(5,948)	736,566
Balance, Shares at Dec. 31, 2021			162,251
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
Stock-based compensation expense	14,204				14,204
Repurchase of common stock	$ (211,466)		$ (219)				(211,247)
Repurchase of common stock (in shares)	1,800		(1,750)
Cash dividends	$ (17,908)						(17,908)
Settlements of convertible notes	(93)		$ 64		(157)
Settlement of convertible debt (in shares)			509
Exercise of convertible notes hedge call options			$ (64)		64
Exercise of convertible notes hedge call options (in shares)			(509)
Cumulative-effect of change in accounting principle related to convertible debt	(6,472)			$ (1,512)	(99,322)		92,850
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		0	161,053

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE COMMON SHARES AND SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Common Stock, Dividends, Per Share, Cash Paid	$ 0.11	$ 0.10

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Cash flows from operating activities:
Net income	$ 161,928	$ 205,512
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	22,503	23,910
Stock-based compensation	12,894	12,232
Amortization	5,233	9,822
Deferred taxes	11,288	(1,057)
Losses (gains) on investments	2,001	(2,491)
Provision for excess and obsolete inventory	1,590	2,285
Loss on convertible debt conversions	0	4,069
Contingent consideration fair value adjustments	0	(7,227)
Other	177	200
Changes in operating assets and liabilities, net of businesses acquired:
Retirement plan actuarial (gains) losses	(1,329)	(1,925)
Accounts receivable	208	(87,512)
Inventories	(9,480)	(35,870)
Prepayments and other assets	(74,305)	(86,131)
Accounts payable and other accrued expenses	(124,382)	(10,571)
Deferred revenue and customer advances	6,747	7,952
Income taxes	(7,611)	4,941
Net cash provided by operating activities	7,462	38,139
Cash flows from investing activities:
Purchases of property, plant and equipment	(43,999)	(39,250)
Purchases of marketable securities	(165,977)	(211,604)
Proceeds from maturities of marketable securities	96,682	194,228
Proceeds from sales of marketable securities	30,581	61,293
Net cash provided by (used for) investing activities	(82,713)	4,667
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	16,475	17,144
Repurchase of common stock	(201,465)	(45,188)
Payments related to net settlement of employee stock compensation awards	(31,048)	(30,675)
Payments of convertible debt principal	(20,694)	(51,275)
Dividend payments	(17,895)	(16,667)
Net cash used for financing activities	(254,627)	(126,661)
Effects of exchange rate changes on cash and cash equivalents	2,282	883
Decrease in cash and cash equivalents	(327,596)	(82,972)
Cash and cash equivalents at beginning of period	1,122,199	914,121
Cash and cash equivalents at end of period	794,603	831,149
Non-cash investing activities:
Capital expenditures incurred but not yet paid	$ 2,500	$ 3,840

The Company

The Company	3 Months Ended
	Apr. 03, 2022
The Company	A. THE COMPANY Teradyne, Inc. (“Teradyne”) is a leading global supplier of automation equipment for test and industrial applications. Teradyne designs, develops, manufactures and sells automatic test systems used to test semiconductors, wireless products, data storage and complex electronics systems in many industries including consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s industrial automation products include collaborative robotic arms, autonomous mobile robots, and advanced robotic control software used by global manufacturing, logistics and light industrial customers to improve quality, increase manufacturing and material handling efficiency and decrease manufacturing and logistics costs. Teradyne’s automatic test equipment and industrial automation products and services include: • semiconductor test (“Semiconductor Test”) systems; • storage and system level test (“Storage Test”) systems, defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”); • wireless test (“Wireless Test”) systems; and • industrial automation (“Industrial Automation”) products.

Accounting Policies

Accounting Policies	3 Months Ended
	Apr. 03, 2022
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, 2021 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. Convertible Debt Teradyne adopted Accounting Standards Update (“ASU”) ASU 2020-06 “Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity’s Own Equity,” . 2020-06, if-converted of debt paid-in

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	3 Months Ended
	Apr. 03, 2022
Recently Issued Accounting Pronouncements	C. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS For the three months ended April 3, 2022, there were no recently issued accounting pronouncements that had, or are expected to have, a material impact to Teradyne’s consolidated financial statements.

Investment In Other Company

Investment In Other Company	3 Months Ended
	Apr. 03, 2022
Equity Method Investments and Joint Ventures [Abstract]
Investment In Other Company	D. INVESTMENT IN OTHER COMPANY On June 1, 2021, Teradyne invested $12.0 million in MachineMetrics, Inc. (“MachineMetrics”), a private company that develops and sells products to improve manufacturing performance through automated machine data collection, alerting, and analytics. Teradyne’s investment in MachineMetrics aligns with its strategy of providing and investing in leading edge products for automating industrial production processes in growing markets. The investment was recorded at cost and is evaluated for impairment or an indication of changes in fair value resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer on a quarterly basis. At April 3, 2022, the value of the investment was $12.0 million, and there was no change during the three months ended April 3, 2022.

Revenue

Revenue	3 Months Ended
	Apr. 03, 2022
Revenue from Contract with Customer [Abstract]
Revenue	E. REVENUE Disaggregation of Revenue The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines. Semiconductor Test Industrial Automation System on-a- Memory System Test Universal Mobile AutoGuide Wireless Test Corporate and Eliminations Total (in thousands) For the Three Months Ended April 3, 2022 (1) Timing of Revenue Recognition Point in Time $ 323,456 $ 88,723 $ 105,288 $ 83,182 $ 16,534 $ 210 $ 48,429 $ (346 ) $ 665,476 Over Time 63,129 7,033 13,380 2,102 674 487 3,089 — 89,894 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,208 $ 697 $ 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 7,867 697 9,687 (346 ) 114,421 Europe, Middle East and 16,130 559 8,276 38,515 6,749 — 6,885 — 77,114 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,208 $ 697 $ 51,518 $ (346 ) $ 755,370 For the Three Months Ended April 4, 2021 (1) Timing of Revenue Recognition Point in Time $ 364,190 $ 101,892 $ 119,314 $ 64,007 $ 14,064 $ (120 ) $ 37,880 $ (143 ) $ 701,084 Over Time 56,040 5,941 13,523 1,594 67 339 3,018 — 80,522 Total $ 420,230 $ 107,833 $ 132,837 $ 65,601 $ 14,131 $ 219 $ 40,898 $ (143 ) $ 781,606 Geographical Market Asia Pacific $ 387,236 $ 104,049 $ 99,520 $ 17,833 $ 3,447 $ — $ 33,532 $ — $ 645,617 Americas 20,779 3,420 27,659 18,153 5,153 219 5,769 (143 ) 81,009 Europe, Middle East and 12,215 364 5,658 29,615 5,531 — 1,597 — 54,980 Total $ 420,230 $ 107,833 $ 132,837 $ 65,601 $ 14,131 $ 219 $ 40,898 $ (143 ) $ 781,606 (1) Includes $2.3 million and $3.1 million in 2022 and 2021, 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 3, 2022 and April 4, 2021, Teradyne recognized $35.0 million and $27.8 million, respectively, that was previously 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 3, 2022, Teradyne has $1,417.4 million of unsatisfied performance obligations. Teradyne expects to recognize 89% of the remaining performance obligations in the next 12 months and 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 3, 2022 December 31, (in thousands) Maintenance, service and training $ 83,212 $ 81,826 Customer advances, undelivered elements and other 58,521 55,112 Extended warranty 65,726 64,168 Total deferred revenue and customer advances $ 207,459 $ 201,106 Accounts Receivable During the three months ended April 3, 2022 and April 4, 2021, Teradyne sold certain trade accounts receivables on a non-recourse basis to third-party financial institutions pursuant to factoring agreements. During the three months ended April 3, 2022 and April 4, 2021, total trade accounts receivable sold under the factoring agreements were , respectively. Factoring fees for the sales of receivables were recorded in interest expense and were not material. Teradyne accounted for these transactions as sales of receivables and presented cash proceeds as cash provided by

Inventories

Inventories	3 Months Ended
	Apr. 03, 2022
Inventories	F. INVENTORIES Inventories, net consisted of the following at April 3, 2022 and December 31, 2021: April 3, December 31, (in thousands) Raw material $ 187,856 $ 155,641 Work-in-process 30,877 37,740 Finished goods 40,608 49,949 $ 259,341 $ 243,330 Inventory reserves at April 3, 2022 and December 31, 2021 were $112.8 million and $114.1 million, respectively.

Financial Instruments

Financial Instruments	3 Months Ended
	Apr. 03, 2022
Financial Instruments	G. FINANCIAL INSTRUMENTS Cash Equivalents Teradyne considers all highly liquid investments with maturities of three months or less at the date of acquisition to be cash equivalents. Marketable Securities Teradyne’s available-for-sale During the three months ended April 3, 2022 and April 4, 2021, 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 3, 2022 and April 4, 2021 were $0.4 million and $1.2 million, respectively. Realized losses recorded in the three months ended April 3, 2022 were $0.2 million. No realized losses were recorded in the three months ended April 4, 2021. Realized gains and losses are included in other (income) expense, net. Unrealized losses on equity securities recorded in the three months ended April 3, 2022 were $2.2 million. Unrealized gains on equity securities recorded in the three months ended April 4, 2021 were $1.4 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 3, 2022 and December 31, 2021. April 3, 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 $ 508,245 $ — $ — $ 508,245 Cash equivalents 212,647 73,711 — 286,358 Available-for-sale Commercial paper — 179,481 — 179,481 U.S. Treasury securities — 119,837 — 119,837 Corporate debt securities — 53,161 — 53,161 Debt mutual funds 7,030 — — 7,030 U.S. government agency securities — 4,714 — 4,714 Certificates of deposit and time deposits — 1,312 — 1,312 Non-U.S. — 578 — 578 Equity securities: Mutual funds 42,033 — — 42,033 $ 769,955 $ 432,794 $ — $ 1,202,749 Derivative assets — 9 — 9 Total $ 769,955 $ 432,803 $ — $ 1,202,758 Liabilities Derivative liabilities $ — $ 469 $ — $ 469 Total $ — $ 469 $ — $ 469 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 720,892 $ 73,711 $ — $ 794,603 Marketable securities — 282,016 — 282,016 Long-term marketable securities 49,063 77,067 — 126,130 Prepayments — 9 — 9 Total $ 769,955 $ 432,803 $ — $ 1,202,758 Liabilities Other current liabilities $ — $ 469 $ — $ 469 Total $ — $ 469 $ — $ 469 December 31, 2021 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 $ 628,740 $ — $ — $ 628,740 Cash equivalents 412,212 81,247 — 493,459 Available for sale securities: Commercial paper — 189,620 — 189,620 U.S. Treasury securities — 77,789 — 77,789 Corporate debt securities — 56,901 — 56,901 Debt mutual funds 7,971 — — 7,971 U.S. government agency securities — 4,610 — 4,610 Certificates of deposit and time deposits — 1,356 — 1,356 Non-U.S. — 589 — 589 Equity securities: Mutual funds 39,253 — — 39,253 Total $ 1,088,176 $ 412,112 $ — $ 1,500,288 Derivative assets — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Derivative liabilities $ — $ 118 $ — $ 118 Total $ — $ 118 $ — $ 118 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 1,040,952 $ 81,247 $ — $ 1,122,199 Marketable securities — 244,231 — 244,231 Long-term marketable securities 47,224 86,634 — 133,858 Prepayments — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Other current liabilities $ — $ 118 $ — $ 118 Total $ — $ 118 $ — $ 118 Changes in the fair value of Level 3 contingent consideration for the three months ended April 3, 2022, and April 4, 2021 were as follows: For the Three Months Ended April 3, April 4, (in thousands) Balance at beginning of period $ — $ 7,227 Fair value adjustment (a) — (7,227 ) Balance at end of period $ — $ — (a) In the three months ended April 4, 2021, the fair value of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide was reduced to zero, which resulted in a benefit of $7.2 million, primarily due to a decrease in forecasted revenues and earnings before interest and taxes. On March 25, 2022, the arbitration claim filed by Industrial Automation LLC, sellers of AutoGuide, against Teradyne alleging non-compliance earn-out for earn-out The carrying amounts and fair values of Teradyne’s financial instruments at April 3, 2022 and December 31, 2021 were as follows: April 3, 2022 December 31, 2021 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 794,603 $ 794,603 $ 1,122,199 $ 1,122,199 Marketable securities 408,146 408,146 378,089 378,089 Derivative assets 9 9 92 92 Liabilities Derivative liabilities 469 469 118 118 Convertible debt 95,875 323,670 108,426 604,648 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 3, 2022 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Commercial paper $ 179,736 $ 3 $ (258 ) $ 179,481 $ 106,951 U.S. Treasury securities 121,504 8 (1,675 ) 119,837 114,043 Corporate debt securities 53,079 1,585 (1,503 ) 53,161 32,283 Debt mutual funds 7,150 — (120 ) 7,030 — U.S. government agency securities 4,795 — (81 ) 4,714 4,714 Certificates of deposit and time deposits 1,312 — — 1,312 — Non-U.S. 578 — — 578 — $ 368,154 $ 1,596 $ (3,637 ) $ 366,113 $ 257,991 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 282,563 $ 11 $ (558 ) $ 282,016 $ 202,243 Long-term marketable securities 85,591 1,585 (3,079 ) 84,097 55,748 $ 368,154 $ 1,596 $ (3,637 ) $ 366,113 $ 257,991 The following table summarizes the composition of available-for-sale December 31, 2021 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Commercial paper $ 189,614 $ 15 $ (9 ) $ 189,620 $ 22,784 U.S. Treasury securities 77,707 551 (470 ) 77,789 46,435 Corporate debt securities 52,266 4,863 (227 ) 56,901 19,422 Debt mutual funds 7,928 43 — 7,971 — U.S. government agency securities 4,617 5 (12 ) 4,610 3,296 Certificates of deposit and time deposits 1,356 — — 1,356 — Non-U.S. 589 — — 589 — $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 244,213 $ 64 $ (46 ) $ 244,231 $ 54,798 Long-term marketable securities 89,864 5,413 (672 ) 94,605 37,139 $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 As of April 3, 2022, the fair market value of investments with unrealized losses less than one year and greater than one year totaled $248.2 million and $9.8 million , Teradyne reviews its investments to identify and evaluate investments that have an indication of possible impairment. Based on this review, Teradyne determined that the unrealized losses related to these investments at April 3, 2022 and December 31, 2021 were not other than temporary. The contractual maturities of investments in available-for-sale April 3, 2022 Cost Fair Market Value (in thousands) Due within one year $ 282,563 $ 282,016 Due after 1 year through 5 years 36,844 35,718 Due after 5 years through 10 years 6,117 5,978 Due after 10 years 35,480 35,371 Total $ 361,004 $ 359,083 Contractual maturities of investments in available-for-sale securities held at April 3 , 2022 exclude debt mutual funds with a fair market value of $7.0 million, as they do not have a contractual maturity date. Derivatives Teradyne conducts business in a number of foreign countries, with certain transactions denominated in local currencies. The purpose of Teradyne’s foreign currency management is to minimize the effect of exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. Teradyne does not use derivative financial instruments for trading or speculative purposes. To minimize the effect of exchange rate fluctuations associated with the remeasurement of monetary assets and liabilities denominated in foreign currencies, Teradyne enters into foreign currency forward contracts. The change in fair value of these derivatives is recorded directly in earnings and is used to offset the change in value of monetary assets and liabilities denominated in foreign currencies. At April 3, 2022 and December 31, 2021, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts: April 3, 2022 December 31, 2021 Buy Sell Net Total Buy Sell Position Net Total (in millions) Japanese Yen $ (45.9 ) $ — $ (45.9 ) $ (31.4 ) $ — $ (31.4 ) Taiwan Dollar (43.7 ) — (43.7 ) (35.1 ) — (35.1 ) Korean Won (5.0 ) — (5.0 ) (4.2 ) — (4.2 ) British Pound Sterling (2.9 ) — (2.9 ) (1.8 ) — (1.8 ) Singapore Dollar — 75.5 75.5 — 61.9 61.9 Euro — 42.3 42.3 — 44.9 44.9 Philippine Peso — 3.8 3.8 — 3.9 3.9 Chinese Yuan — 2.8 2.8 — 2.8 2.8 Total $ (97.5 ) $ 124.4 $ 26.9 $ (72.5 ) $ 113.5 $ 41.0 The fair value of the outstanding contracts was a loss of $0.5 million and $0.1 million, respectively, at April 3, 2022 and December 31, 2021. Gains and losses on foreign currency forward contracts and foreign currency remeasurement gains and losses on monetary assets and liabilities are included in other (income) expense, net. The following table summarizes the fair value of derivative instruments as of April 3, 2022 and December 31, 2021: Balance Sheet Location April 3, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Prepayments $ 9 $ 92 Foreign exchange contracts Other current liabilities (469 ) (118 ) Total derivatives $ (460 ) $ (26 ) The following table summarizes the effect of derivative instruments recognized in the statement of operations for the three months ended April 3, 2022 and April 4, 2021: Location of (Gains) Losses For the Three Months Ended Recognized in April 3, April 4, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ (1,752 ) $ 2,118 (1) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. (2) For the three months ended April 3, 2022 (3) For the three months ended April 4, 2021, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $0.2 million. See Note H: “Debt” regarding derivatives related to the convertible senior notes.

Debt

Debt	3 Months Ended
	Apr. 03, 2022
Debt	H. DEBT Convertible Senior Notes On December 12, 2016 December 15, 2023 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 % per 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 (and only during such calendar quarter), if the closing sale price of Teradyne’s common stock, for at least trading days (whether or not consecutive) during a period of consecutive trading days ending on the last trading day of the immediately preceding calendar % of the conversion price on each applicable trading day; (2) during the business day period after any consecutive trading day period (the “measurement period”) in which the trading price (as defined in the Indenture) per $ principal amount of Notes for each trading day of the measurement period was less than % 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 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. As of April 3, 2022, the conversion price was approximately $ per share of Teradyne’s common stock. The conversion rate is subject to adjustment under certain circumstances. As of May 6, 2022, ninety eight holders had exercised the option to convert $ 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 $31.51. 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 ed was Effective January 1, 2022, Teradyne adopted ASC 2020-06 using the modified retrospective method of transition and accounts for the debt as a single liability measured at its amortized cost. As a result of the adoption, Teradyne recorded an increase of million to current debt for unsettled shares, an increase of to long-term debt for unamortized debt discount, and an increase to retained earnings of for the reclassification of the equity component. Mezzanine equity representing unsettled shares value was reduced to zero and additional paid-in capital was reduced by 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. Debt issuance fees , at April 3, 2022, The below tables represent the key components of Teradyne’s convertible senior notes: April 3, December 31, (in thousands) Debt principal $ 96,285 $ 116,980 Unamortized debt issuance fees 410 8,554 Net carrying amount of convertible debt $ 95,875 $ 108,426 Reported as follows: April 3, December 31, (in thousands) Current debt $ 20,497 $ 19,182 Long-term debt 75,378 89,244 Net carrying amount of convertible debt $ 95,875 $ 108,426 For the Three Months April 3, April 4, (in thousands) Contractual interest expense on the coupon $ 311 $ 1,239 Amortization of debt issuance 2 66 3,836 Total interest expense on the convertible debt $ 377 $ 5,075 (1) Unamortized debt issuance fees as of December 31, 2021 include unamortized debt discount of $8.1 million, which was eliminated with the adoption of ASU 2020-6 on January 1, 2022. (2) Three months ended April 4, 2021 includes the amortization of debt discount component, which was eliminated with the adoption of ASU 2020-06 As of April 3, 2022, the conversion price was approximately $31.51 per share and the if-converted During the three months ended April 3, 2022, eleven debt holders elected to convert $20.7 million of debt principal. The conversion of the debt was settled in cash for principal amount and in shares for the excess of conversion value over principal amount. The 0.5 million shares issued to the debt holders were received from exercising the convertible notes hedge call options. Additional conversions of approximately $20.5 million of debt principal will occur in the second quarter of 2022 and the liability is included in current debt. Teradyne expects to make principal interest payments of $1.2 million in the next 12 months and $1.2 million thereafter. 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 provide d On December 10, 2021, the Credit Agreement was amended to extend maturity date of the Credit Facility to December 10, 2026. The amended Credit Agreement provides that, subject to customary conditions, Teradyne may seek to obtain from existing or new lenders the available incremental amount under the Credit Facility, not 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 LIBOR plus a margin ranging from 1.00% to 1.75% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio. Teradyne is not required to repay any loans under the Credit Facility prior to maturity, subject to certain customary exceptions. Teradyne is permitted to prepay all or any portion of the loans under the Credit Facility prior to maturity without premium or penalty, other than customary LIBOR breakage costs. The Credit Agreement contains customary events of default, representations, warranties and affirmative and negative covenants that, among other things, limit Teradyne’s ability to sell assets, grant liens on assets, incur other secured indebtedness and make certain investments and restricted payments, all subject to exceptions set forth in the Credit Agreement. The Credit 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 6, 2022, Teradyne has not borrowed any funds under the credit facility and was in compliance with all covenants.

Prepayments

Prepayments	3 Months Ended
	Apr. 03, 2022
Prepayments [Abstract]
Prepayments	I. PREPAYMENTS Prepayments consist of the following: April 3, December 31, (in thousands) Contract manufacturer and supplier prepayments $ 441,665 $ 364,478 Prepaid maintenance and other services 14,772 13,660 Prepaid taxes 10,756 15,090 Other prepayments 12,221 13,038 Total prepayments $ 479,414 $ 406,266

Product Warranty

Product Warranty	3 Months Ended
	Apr. 03, 2022
Product Warranties Disclosures [Abstract]
Product Warranty	J. PRODUCT WARRANTY Teradyne generally provides a one-year For the Three Months Ended April 3, April 4, 2021 (in thousands) Balance at beginning of period $ 24,577 $ 16,633 Accruals for warranties issued during the period 4,100 11,881 Accruals related to pre-existing (2,758 ) 447 Settlements made during the period (5,814 ) (5,068 ) Balance at end of period $ 20,105 $ 23,893 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 3, April 4, (in thousands) Balance at beginning of period $ 64,168 $ 51,929 Deferral of new extended warranty revenue 11,774 7,517 Recognition of extended warranty deferred revenue (10,216 ) (5,538 ) Balance at end of period $ 65,726 $ 53,908

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 03, 2022
Stock-Based Compensation	K. STOCK-BASED COMPENSATION Under Teradyne’s stock compensation plans, Teradyne grants service-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-recurring retirement and termination eligibility provisions noted below. If sixty 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 , and April , , Teradyne granted million and million of service-based restricted stock unit awards to employees at a weighted average grant date fair value of $ and $ , respectively. During the three months ended April 3, 2022 and April 4, 2021, Teradyne granted 0.1 million of PBIT PRSUs with a grant date fair value of $110.84 and $112.28, respectively. During the three months ended April 3, 2022 and April 4, 2021, Teradyne granted 0.1 million of TSR PRSUs, with a grant date fair value of $101.06 and $125.02, respectively. The fair value was estimated using the Monte Carlo simulation model with the following assumptions:​​​​​​​ For the Three Months Ended April 3, April 4, Risk-free interest rate 1.4 % 0.2 % Teradyne volatility-historical 47.1 % 43.9 % NYSE Composite Index volatility-historical 22.7 % 22.9 % 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 $ per share divided by Teradyne’s stock price on the grant date of $ for the 2022 grant and an estimated annual dividend amount of $ per share divided by Teradyne’s stock price on the grant date of $ for the 2021 grant. During the three months ended April 3, 2022 and April 4, 2021, Teradyne granted 0.1 million of service-based stock options to executive officers at a weighted average grant date fair value of $39.01 and $36.60, 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 3, April 4, Expected life (years) 4.0 5.0 Risk-free interest rate 1.6 % 0.4 % Volatility-historical 43.7 % 37.8 % 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 $112.12 for the 2022 grant and an estimated annual dividend amount of $0.40 per share divided by Teradyne’s stock price on the grant date of $113.48 for the 2021 grant.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Apr. 03, 2022
Accumulated Other Comprehensive Income (Loss)	L. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following: Foreign Currency Translation Adjustment Unrealized Gains (Losses) on Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Three Months Ended April 3, 2022 Balance at December 31, 2021, net of tax of $0, $1,055, $(1,128), respectively $ (10,818 ) $ 3,704 $ 1,166 $ (5,948 ) Other comprehensive loss before reclassifications, net of tax of $0, $(1,333), $0, respectively (8,076 ) (5,388 ) — (13,464 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(18), $0, respectively — (65 ) (2 ) (67 ) Net current period other comprehensive loss, net of tax of $0, $(1,351), $0, respectively (8,076 ) (5,453 ) (2 ) (13,531 ) Balance at April 3, 2022, net of tax of $0, $(296), $(1,128), respectively $ (18,894 ) $ (1,749 ) $ 1,164 $ (19,479 ) Three Months Ended April 4, 2021 Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126), respectively $ 25,389 $ 6,954 $ 1,173 $ 33,516 Other comprehensive loss before reclassifications, net of tax of $0, $(908), $0, respectively (21,123 ) (3,270 ) — (24,393 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(123), $0, respectively — (444 ) (2 ) (446 ) Net current period other comprehensive loss, net of tax of $0, $(1,031), $0, respectively (21,123 ) (3,714 ) (2 ) (24,839 ) Balance at April 4, 2021, net of tax of $0, $879, $(1,126), respectively $ 4,266 $ 3,240 $ 1,171 $ 8,677 Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended April 3, 2022 and April 4, 2021 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 3, April 4, 2022 2021 (in thousands) Available-for-sale Unrealized gains, net of tax of $18 and $123, respectively $ 65 $ 444 Other (income) Defined benefit pension and postretirement plans: Amortization of prior service cre dit 2 2 (a) Total reclassifications, net of tax of $18 and $123, respectively $ 67 $ 446 Net income (a) The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note P

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	3 Months Ended
	Apr. 03, 2022
Goodwill and Acquired Intangible Assets	M. GOODWILL AND ACQUIRED INTANGIBLE ASSETS Goodwill Teradyne performs its annual goodwill impairment test as required under the provisions of ASC 350-10, “Intangibles—Goodwill and Other” , The changes in the carrying amount of goodwill by reportable segments for the three months ended April 3, 2022, were as follows: Industrial Automation Wireless Test Semiconductor Test System Test Total (in thousands) Balance at December 31, 2021 Goodwill $ 405,971 $ 361,819 $ 262,101 $ 158,699 $ 1,188,590 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) Total goodwill 405,971 7,976 1,561 10,516 426,024 Foreign currency translation adjustment (6,122 ) — (14 ) — (6,136 ) Balance at April 3, 2022 Goodwill 399,849 361,819 262,087 158,699 1,182,454 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) Total goodwill $ 399,849 $ 7,976 $ 1,547 $ 10,516 $ 419,888 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 Net Carrying Amount (in thousands) Balance at April 3, 2022 Developed technology $ 272,547 $ (226,648 ) $ (4,565 ) $ 41,334 Customer relationships 57,739 (49,492 ) 194 8,441 Tradenames and trademarks 59,387 (38,494 ) (822 ) 20,071 Total intangible assets $ 389,673 $ (314,634 ) $ (5,193 ) $ 69,846 Balance, December 31, 2021 Developed technology $ 272,547 $ (223,413 ) $ (4,093 ) $ 45,041 Customer relationships 57,739 (48,921 ) 209 9,027 Tradenames and trademarks 59,387 (37,237 ) (583 ) 21,567 Total intangible assets $ 389,673 $ (309,571 ) $ (4,467 ) $ 75,635 Aggregate intangible asset amortization expense for the three months ended April 3, 2022 and April 4, 2021 was $ million and $ million, respectively. Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter Year Amortization Expense (in thousands) 2022 $ 14,879 2023 19,377 2024 19,069 2025 11,456 2026 2,404 Thereafter 2,661

Net Income Per Common Share

Net Income Per Common Share	3 Months Ended
	Apr. 03, 2022
Net Income per Common Share	N. NET INCOME PER COMMON SHARE The following table sets forth the computation of basic and diluted net income per common share: For the Three Months Ended April 3, April 4, 2022 2021 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 161,928 $ 205,512 Weighted average common shares-basic 162,048 166,491 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 10,028 9,429 Incremental shares from assumed conversion of convertible notes (2) 2,541 10,310 Restricted stock units 875 1,395 Stock options 69 108 Employee stock purchase plan 14 7 Dilutive potential common shares 13,527 21,249 Weighted average common shares-diluted 175,575 187,740 Net income per common share-basic $ 1.00 $ 1.23 Net income per common share-diluted $ 0.92 $ 1.09 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.54, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. (2) Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.51, multiplied by 3.4 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period. The computation of diluted net income per common share for the three months ended April 3, 2022 and April 4, 2021 excludes the effect of the potential vesting of 0.1 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. 03, 2022
Restructuring and Related Activities [Abstract]
Restructuring and Other	O. RESTRUCTURING AND OTHER 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 dispute, which was settled on 25, During the three months ended April 4, 2021, Teradyne recorded a gain of $7.2 million for the decrease in the fair value of the AutoGuide contingent consideration liability.

Retirement Plans

Retirement Plans	3 Months Ended
	Apr. 03, 2022
Retirement Plans	P. RETIREMENT PLANS ASC 715, “Compensation—Retirement Benefits,” requires an employer with defined benefit plans or other postretirement benefit plans to recognize an asset or a liability on its balance sheet for the overfunded or underfunded status of the plans as defined by ASC 715. The pension asset or liability represents a difference between the fair value of the pension plan’s assets and the projected benefit obligation at December 31. Teradyne uses a December 31 measurement date for all 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 months ended April , and April , , Teradyne contributed $ million and $ million, respectively, to the U.S. supplemental executive defined benefit pension plan , and $ million and $ million, respectively, to certain qualified pension plans for non-U.S. subsidiaries. For the three months ended April 3, 2022 and April 4, 2021, Teradyne’s net periodic pension cost was comprised of the following: For the Three Months Ended April 3, 2022 April 4, 2021 United States Foreign United States Foreign (in thousands) Service cost $ 397 $ 206 $ 453 $ 243 Interest cost 1,222 118 1,100 87 Expected return on plan assets (732 ) (20 ) (936 ) (16 ) Total net periodic pension cost $ 887 $ 304 $ 617 $ 314 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 3, 2022 and April 4, 2021, Teradyne’s net periodic postretirement benefit cost was comprised of the following: For the Three Months Ended April 3, April 4, (in thousands) Service cost $ 17 $ 16 Interest cost 44 44 Amortization of prior service credit (2 ) (2 ) Total net periodic postretirement benefit cost $ 59 $ 58

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 03, 2022
Commitments and Contingencies	Q. COMMITMENTS AND CONTINGENCIES Purchase Commitments As of April 3, 2022, Teradyne had entered into purchase commitments for certain components and materials. The purchase commitments covered by the agreements aggregate to approximately $904.0 million, of which $826.7 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 ful million. As a result, Teradyne has no remaining 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 and charter. As a matter of practice, Teradyne has maintained directors’ and officers’ liability insurance coverage including coverage for directors and officers of acquired companies. Teradyne enters into agreements in the ordinary course of business with customers, resellers, distributors, integrators and suppliers. Most of these agreements require Teradyne to defend and/or indemnify the other party against intellectual property infringement claims brought by a third party with respect to Teradyne’s products. From time to time, Teradyne also indemnifies customers and business partners for damages, losses and liabilities they may suffer or incur relating to personal injury, personal property damage, product liability, breach of confidentiality obligations and environmental claims relating to the use of Teradyne’s products and services or resulting from the acts or omissions of Teradyne, its employees, authorized agents or subcontractors. On occasion, Teradyne has also provided guarantees to customers regarding the delivery and performance of its products in addition to the warranty described below. As a matter of ordinary course of business, Teradyne warrants that its products will substantially perform in accordance with its standard published specifications in effect at the time of delivery. Most warranties have a one-year duration commencing from installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based upon historical experience. When Teradyne receives revenue for extended warranties beyond the standard duration, the revenue is deferred and recognized on a straight-line basis over the contract period. Related costs are expensed as incurred. As of April 3, 2022 and December 31, 2021, Teradyne had a product warranty accrual of $20.1 million and $24.6 million, respectively, included in other accrued liabilities, and revenue deferrals related to extended warranties of $65.7 million and $64.2 million, respectively, included in short and long-term deferred revenue and customer advances. In addition, in the ordinary course of business, Teradyne provides minimum purchase guarantees to certain vendors to ensure continuity of supply against the market demand. Although some of these guarantees provide penalties for cancellations and/or modifications to the purchase commitments as the market demand decreases, most of the guarantees do not. Therefore, as the market demand decreases, Teradyne re-evaluates these guarantees and determines what charges, if any, should be recorded. With respect to its agreements covering product, business or entity divestitures and acquisitions, Teradyne provides certain representations, warranties and covenants to purchasers and agrees to indemnify and hold such purchasers harmless against breaches of such representations, warranties and covenants. Many of the indemnification claims have a definite expiration date while some remain in force indefinitely. With respect to its acquisitions, Teradyne may, from time to time, assume the liability for certain events or occurrences that took place prior to the date of acquisition. As a matter of ordinary course of business, Teradyne occasionally guarantees certain indebtedness obligations of its subsidiary companies, limited to the borrowings from financial institutions, purchase commitments to certain vendors, and lease commitments to landlords. Based on historical experience and information known as of April 3, 2022 and December 31, 2021, 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. 03, 2022
Income Taxes	R. INCOME TAXES A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows: For the Three Months Ended April 3, April 4, US statutory federal tax rate 21.0 % 21.0 % Non-deductible 1.1 0.8 Discrete benefit related to equity compensation (6.6 ) (6.2 ) Foreign taxes (3.4 ) (4.7 ) Tax credits (1.6 ) (1.3 ) International provisions of the U.S. Tax Cuts and Jobs Act of 2017 (1.3 ) (1.5 ) Other, net 1.0 0.2 Effective tax rate 10.2 % 8.3 % On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of April 3, 2022, 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 3, 2022 and December 31, 2021, Teradyne had $14.6 million and $14.5 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 3, 2022, Teradyne estimates that it is reasonably possible that the balance of unrecognized tax benefits may decrease approximately $0.2 million in the next twelve months because of a lapse of statutes of limitation. The estimated decrease relates to loss carryforwards. Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of April 3, 2022 and December 31, 2021, $0.3 million and $0.3 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the three months ended April 3, 2022 and April 4, 2021, 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 3, 2022 was $3.5 million, or $0.02 per diluted share. The tax savings due to the tax holiday for the three months ended April 4, 2021 was $6.2 million, or $0.03 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.

Segment Information

Segment Information	3 Months Ended
	Apr. 03, 2022
Segment Reporting [Abstract]
Segment Information	S. SEGMENT INFORMATION Teradyne has four reportable segments (Semiconductor Test, System Test, Industrial Automation and Wireless Test). Each of the reportable segments is also 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 Industrial Automation segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms, autonomous mobile robots and advanced robotic control software. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test products and services. Each operating segment has a segment manager who is directly accountable to and maintains regular contact with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts, and plans for the segment.​​​​​​​ Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments in effect are described in Note B: “Accounting Policies” in Teradyne’s Annual Report on Form 10-K Segment information for the three months ended April 3, 2022 and April 4, 2021 is as follows: Semiconductor Test System Test Industrial Automation Wireless Test Corporate and Eliminations Consolidated (in thousands) 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 Three Months Ended April 4, 2021 Revenues $ 528,063 $ 132,837 $ 79,951 $ 40,898 $ (143 ) $ 781,606 Income (loss) before income taxes (1)(2) 176,368 51,061 (12,967 ) 9,616 (85 ) 223,993 Total assets (3) 1,243,358 179,195 672,596 104,367 1,520,201 3,719,717 (1) Included in Corporate and Eliminations are: legal fees, contingent consideration fair value adjustments, interest income, interest expense, severance charges, net foreign exchange gains (losses), acquisition related charges and compensation, intercompany eliminations and for the three months ended April 4, 2021, loss on convertible debt conversions. (2) Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and, for the three months ended April 4, 2021, loss on convertible debt conversions. (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 3, April 4, (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ — $ 1,079 Industrial Automation: Cost of revenues—inventory charge $ — $ 1,221 Wireless: Cost of revenues—inventory charge $ 877 $ — Corporate and Eliminations Restructuring and other— legal charge $ 14,700 $ — Restructuring and other—AutoGuide contingent consideration adjustment — (7,227 ) Other (income) expense, net—loss on convertible debt conversion s — 4,069 Restructuring and other—acquisition related expenses and compensation — (513 )

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Apr. 03, 2022
Equity [Abstract]
Shareholders' Equity	T. SHAREHOLDERS’ EQUITY Stock Repurchase Program In January 2021, Teradyne’s Board of Directors cancelled the January 2020 repurchase program and approved a new repurchase program for up to $2.0 billion of common stock. Teradyne intends to repurchase a minimum of $750.0 million of its common stock in The total price includes commissions and is recorded as a reduction to retained earnings. Dividend Holders of Teradyne’s common stock are entitled to receive dividends when they are declared by Teradyne’s Board of Directors. In January 2022, Teradyne’s Board of Directors declared a 10% increase in the quarterly cash dividend to $0.11 per share. Dividend payments for the three months ended April 3, 2022 were $17.9 million. In January 2021, Teradyne’s Board of Directors declared a quarterly cash dividend of $0.10 per share. Dividend payments for the three months ended April 4, 2021 were $16.7 million. While Teradyne declared a quarterly cash dividend and authorized a share repurchase program, it may reduce or eliminate the cash dividend or share repurchase program in the future. Future cash dividends and stock repurchases are subject to the discretion of Teradyne’s Board of Directors which will consider, among other things, Teradyne’s earnings, capital requirements and financial condition.

Accounting Policies (Policies)

Accounting Policies (Policies)	3 Months Ended
	Apr. 03, 2022
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, 2021 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.
Convertible Debt	Convertible Debt Teradyne adopted Accounting Standards Update (“ASU”) ASU 2020-06 “Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity’s Own Equity,” . 2020-06, if-converted of debt paid-in

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Apr. 03, 2022
Revenue from Contract with Customer [Abstract]
Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition	The following table provides information about disaggregated revenue by timing of revenue recognition, primary geographical market, and major product lines. Semiconductor Test Industrial Automation System on-a- Memory System Test Universal Mobile AutoGuide Wireless Test Corporate and Eliminations Total (in thousands) For the Three Months Ended April 3, 2022 (1) Timing of Revenue Recognition Point in Time $ 323,456 $ 88,723 $ 105,288 $ 83,182 $ 16,534 $ 210 $ 48,429 $ (346 ) $ 665,476 Over Time 63,129 7,033 13,380 2,102 674 487 3,089 — 89,894 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,208 $ 697 $ 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 7,867 697 9,687 (346 ) 114,421 Europe, Middle East and 16,130 559 8,276 38,515 6,749 — 6,885 — 77,114 Total $ 386,585 $ 95,756 $ 118,668 $ 85,284 $ 17,208 $ 697 $ 51,518 $ (346 ) $ 755,370 For the Three Months Ended April 4, 2021 (1) Timing of Revenue Recognition Point in Time $ 364,190 $ 101,892 $ 119,314 $ 64,007 $ 14,064 $ (120 ) $ 37,880 $ (143 ) $ 701,084 Over Time 56,040 5,941 13,523 1,594 67 339 3,018 — 80,522 Total $ 420,230 $ 107,833 $ 132,837 $ 65,601 $ 14,131 $ 219 $ 40,898 $ (143 ) $ 781,606 Geographical Market Asia Pacific $ 387,236 $ 104,049 $ 99,520 $ 17,833 $ 3,447 $ — $ 33,532 $ — $ 645,617 Americas 20,779 3,420 27,659 18,153 5,153 219 5,769 (143 ) 81,009 Europe, Middle East and 12,215 364 5,658 29,615 5,531 — 1,597 — 54,980 Total $ 420,230 $ 107,833 $ 132,837 $ 65,601 $ 14,131 $ 219 $ 40,898 $ (143 ) $ 781,606 (1) Includes $2.3 million and $3.1 million in 2022 and 2021, 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 3, 2022 December 31, (in thousands) Maintenance, service and training $ 83,212 $ 81,826 Customer advances, undelivered elements and other 58,521 55,112 Extended warranty 65,726 64,168 Total deferred revenue and customer advances $ 207,459 $ 201,106

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Apr. 03, 2022
Composition of Inventories, Net	Inventories, net consisted of the following at April 3, 2022 and December 31, 2021: April 3, December 31, (in thousands) Raw material $ 187,856 $ 155,641 Work-in-process 30,877 37,740 Finished goods 40,608 49,949 $ 259,341 $ 243,330

Financial Instruments (Tables)

Financial Instruments (Tables)	3 Months Ended
	Apr. 03, 2022
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The following table sets forth by fair value hierarchy Teradyne’s financial assets and liabilities that were measured at fair value on a recurring basis as of April 3, 2022 and December 31, 2021. April 3, 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 $ 508,245 $ — $ — $ 508,245 Cash equivalents 212,647 73,711 — 286,358 Available-for-sale Commercial paper — 179,481 — 179,481 U.S. Treasury securities — 119,837 — 119,837 Corporate debt securities — 53,161 — 53,161 Debt mutual funds 7,030 — — 7,030 U.S. government agency securities — 4,714 — 4,714 Certificates of deposit and time deposits — 1,312 — 1,312 Non-U.S. — 578 — 578 Equity securities: Mutual funds 42,033 — — 42,033 $ 769,955 $ 432,794 $ — $ 1,202,749 Derivative assets — 9 — 9 Total $ 769,955 $ 432,803 $ — $ 1,202,758 Liabilities Derivative liabilities $ — $ 469 $ — $ 469 Total $ — $ 469 $ — $ 469 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 720,892 $ 73,711 $ — $ 794,603 Marketable securities — 282,016 — 282,016 Long-term marketable securities 49,063 77,067 — 126,130 Prepayments — 9 — 9 Total $ 769,955 $ 432,803 $ — $ 1,202,758 Liabilities Other current liabilities $ — $ 469 $ — $ 469 Total $ — $ 469 $ — $ 469 December 31, 2021 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 $ 628,740 $ — $ — $ 628,740 Cash equivalents 412,212 81,247 — 493,459 Available for sale securities: Commercial paper — 189,620 — 189,620 U.S. Treasury securities — 77,789 — 77,789 Corporate debt securities — 56,901 — 56,901 Debt mutual funds 7,971 — — 7,971 U.S. government agency securities — 4,610 — 4,610 Certificates of deposit and time deposits — 1,356 — 1,356 Non-U.S. — 589 — 589 Equity securities: Mutual funds 39,253 — — 39,253 Total $ 1,088,176 $ 412,112 $ — $ 1,500,288 Derivative assets — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Derivative liabilities $ — $ 118 $ — $ 118 Total $ — $ 118 $ — $ 118 Reported as follows: (Level 1) (Level 2) (Level 3) Total (in thousands) Assets Cash and cash equivalents $ 1,040,952 $ 81,247 $ — $ 1,122,199 Marketable securities — 244,231 — 244,231 Long-term marketable securities 47,224 86,634 — 133,858 Prepayments — 92 — 92 Total $ 1,088,176 $ 412,204 $ — $ 1,500,380 Liabilities Other current liabilities $ — $ 118 $ — $ 118 Total $ — $ 118 $ — $ 118
Schedule of Changes in Fair Value of Level 3 Contingent Consideration	Changes in the fair value of Level 3 contingent consideration for the three months ended April 3, 2022, and April 4, 2021 were as follows: For the Three Months Ended April 3, April 4, (in thousands) Balance at beginning of period $ — $ 7,227 Fair value adjustment (a) — (7,227 ) Balance at end of period $ — $ — (a) In the three months ended April 4, 2021, the fair value of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide was reduced to zero, which resulted in a benefit of $7.2 million, primarily due to a decrease in forecasted revenues and earnings before interest and taxes.
Schedule of Carrying Amounts and Fair Values of Financial Instruments	The carrying amounts and fair values of Teradyne’s financial instruments at April 3, 2022 and December 31, 2021 were as follows: April 3, 2022 December 31, 2021 Carrying Value Fair Value Carrying Value Fair Value (in thousands) Assets Cash and cash equivalents $ 794,603 $ 794,603 $ 1,122,199 $ 1,122,199 Marketable securities 408,146 408,146 378,089 378,089 Derivative assets 9 9 92 92 Liabilities Derivative liabilities 469 469 118 118 Convertible debt 95,875 323,670 108,426 604,648
Schedule of Available-for-Sale Marketable Securities	The following table summarizes the composition of available-for-sale April 3, 2022 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Commercial paper $ 179,736 $ 3 $ (258 ) $ 179,481 $ 106,951 U.S. Treasury securities 121,504 8 (1,675 ) 119,837 114,043 Corporate debt securities 53,079 1,585 (1,503 ) 53,161 32,283 Debt mutual funds 7,150 — (120 ) 7,030 — U.S. government agency securities 4,795 — (81 ) 4,714 4,714 Certificates of deposit and time deposits 1,312 — — 1,312 — Non-U.S. 578 — — 578 — $ 368,154 $ 1,596 $ (3,637 ) $ 366,113 $ 257,991 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 282,563 $ 11 $ (558 ) $ 282,016 $ 202,243 Long-term marketable securities 85,591 1,585 (3,079 ) 84,097 55,748 $ 368,154 $ 1,596 $ (3,637 ) $ 366,113 $ 257,991 The following table summarizes the composition of available-for-sale December 31, 2021 Available-for-Sale Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Commercial paper $ 189,614 $ 15 $ (9 ) $ 189,620 $ 22,784 U.S. Treasury securities 77,707 551 (470 ) 77,789 46,435 Corporate debt securities 52,266 4,863 (227 ) 56,901 19,422 Debt mutual funds 7,928 43 — 7,971 — U.S. government agency securities 4,617 5 (12 ) 4,610 3,296 Certificates of deposit and time deposits 1,356 — — 1,356 — Non-U.S. 589 — — 589 — $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937 Reported as follows: Cost Unrealized Gain Unrealized (Loss) Fair Market Value Fair Market Value of Investments with Unrealized Losses (in thousands) Marketable securities $ 244,213 $ 64 $ (46 ) $ 244,231 $ 54,798 Long-term marketable securities 89,864 5,413 (672 ) 94,605 37,139 $ 334,077 $ 5,477 $ (718 ) $ 338,836 $ 91,937
Contractual Maturities of Investments Held	The contractual maturities of investments in available-for-sale April 3, 2022 Cost Fair Market Value (in thousands) Due within one year $ 282,563 $ 282,016 Due after 1 year through 5 years 36,844 35,718 Due after 5 years through 10 years 6,117 5,978 Due after 10 years 35,480 35,371 Total $ 361,004 $ 359,083
Schedule of Notional Amount of Derivatives	At April 3, 2022 and December 31, 2021, Teradyne had the following contracts to buy and sell non-U.S. currencies for U.S. dollars and other non-U.S. currencies with the following notional amounts: April 3, 2022 December 31, 2021 Buy Sell Net Total Buy Sell Position Net Total (in millions) Japanese Yen $ (45.9 ) $ — $ (45.9 ) $ (31.4 ) $ — $ (31.4 ) Taiwan Dollar (43.7 ) — (43.7 ) (35.1 ) — (35.1 ) Korean Won (5.0 ) — (5.0 ) (4.2 ) — (4.2 ) British Pound Sterling (2.9 ) — (2.9 ) (1.8 ) — (1.8 ) Singapore Dollar — 75.5 75.5 — 61.9 61.9 Euro — 42.3 42.3 — 44.9 44.9 Philippine Peso — 3.8 3.8 — 3.9 3.9 Chinese Yuan — 2.8 2.8 — 2.8 2.8 Total $ (97.5 ) $ 124.4 $ 26.9 $ (72.5 ) $ 113.5 $ 41.0
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 3, 2022 and December 31, 2021: Balance Sheet Location April 3, December 31, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Prepayments $ 9 $ 92 Foreign exchange contracts Other current liabilities (469 ) (118 ) Total derivatives $ (460 ) $ (26 )
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 3, 2022 and April 4, 2021: Location of (Gains) Losses For the Three Months Ended Recognized in April 3, April 4, (in thousands) Derivatives not designated as hedging instruments: Foreign exchange contracts Other (income) expense, net $ (1,752 ) $ 2,118 (1) The table does not reflect the corresponding gains and losses from the remeasurement of the monetary assets and liabilities denominated in foreign currencies. (2) For the three months ended April 3, 2022 (3) For the three months ended April 4, 2021, net gains from the remeasurement of monetary assets and liabilities denominated in foreign currencies were $0.2 million.

Debt (Tables)

Debt (Tables)	3 Months Ended
	Apr. 03, 2022
Components of Convertible Senior Notes	The below tables represent the key components of Teradyne’s convertible senior notes: April 3, December 31, (in thousands) Debt principal $ 96,285 $ 116,980 Unamortized debt issuance fees 410 8,554 Net carrying amount of convertible debt $ 95,875 $ 108,426 Reported as follows: April 3, December 31, (in thousands) Current debt $ 20,497 $ 19,182 Long-term debt 75,378 89,244 Net carrying amount of convertible debt $ 95,875 $ 108,426 For the Three Months April 3, April 4, (in thousands) Contractual interest expense on the coupon $ 311 $ 1,239 Amortization of debt issuance 2 66 3,836 Total interest expense on the convertible debt $ 377 $ 5,075 (1) Unamortized debt issuance fees as of December 31, 2021 include unamortized debt discount of $8.1 million, which was eliminated with the adoption of ASU 2020-6 on January 1, 2022. (2) Three months ended April 4, 2021 includes the amortization of debt discount component, which was eliminated with the adoption of ASU 2020-06

Prepayments (Tables)

Prepayments (Tables)	3 Months Ended
	Apr. 03, 2022
Prepayments [Abstract]
Schedule of Prepayments and other assets	Prepayments consist of the following: April 3, December 31, (in thousands) Contract manufacturer and supplier prepayments $ 441,665 $ 364,478 Prepaid maintenance and other services 14,772 13,660 Prepaid taxes 10,756 15,090 Other prepayments 12,221 13,038 Total prepayments $ 479,414 $ 406,266

Product Warranty (Tables)

Product Warranty (Tables)	3 Months Ended
	Apr. 03, 2022
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 3, April 4, 2021 (in thousands) Balance at beginning of period $ 24,577 $ 16,633 Accruals for warranties issued during the period 4,100 11,881 Accruals related to pre-existing (2,758 ) 447 Settlements made during the period (5,814 ) (5,068 ) Balance at end of period $ 20,105 $ 23,893
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 3, April 4, (in thousands) Balance at beginning of period $ 64,168 $ 51,929 Deferral of new extended warranty revenue 11,774 7,517 Recognition of extended warranty deferred revenue (10,216 ) (5,538 ) Balance at end of period $ 65,726 $ 53,908

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 03, 2022
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 3, April 4, Risk-free interest rate 1.4 % 0.2 % Teradyne volatility-historical 47.1 % 43.9 % NYSE Composite Index volatility-historical 22.7 % 22.9 % 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 3, April 4, Expected life (years) 4.0 5.0 Risk-free interest rate 1.6 % 0.4 % Volatility-historical 43.7 % 37.8 % Dividend yield 0.4 % 0.4 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Apr. 03, 2022
Changes in Accumulated Other Comprehensive Income	Changes in accumulated other comprehensive income (loss), which are presented net of tax, consist of the following: Foreign Currency Translation Adjustment Unrealized Gains (Losses) on Marketable Securities Retirement Plans Prior Service Credit Total (in thousands) Three Months Ended April 3, 2022 Balance at December 31, 2021, net of tax of $0, $1,055, $(1,128), respectively $ (10,818 ) $ 3,704 $ 1,166 $ (5,948 ) Other comprehensive loss before reclassifications, net of tax of $0, $(1,333), $0, respectively (8,076 ) (5,388 ) — (13,464 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(18), $0, respectively — (65 ) (2 ) (67 ) Net current period other comprehensive loss, net of tax of $0, $(1,351), $0, respectively (8,076 ) (5,453 ) (2 ) (13,531 ) Balance at April 3, 2022, net of tax of $0, $(296), $(1,128), respectively $ (18,894 ) $ (1,749 ) $ 1,164 $ (19,479 ) Three Months Ended April 4, 2021 Balance at December 31, 2020, net of tax of $0, $1,910, $(1,126), respectively $ 25,389 $ 6,954 $ 1,173 $ 33,516 Other comprehensive loss before reclassifications, net of tax of $0, $(908), $0, respectively (21,123 ) (3,270 ) — (24,393 ) Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(123), $0, respectively — (444 ) (2 ) (446 ) Net current period other comprehensive loss, net of tax of $0, $(1,031), $0, respectively (21,123 ) (3,714 ) (2 ) (24,839 ) Balance at April 4, 2021, net of tax of $0, $879, $(1,126), respectively $ 4,266 $ 3,240 $ 1,171 $ 8,677
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations	Reclassifications out of accumulated other comprehensive income (loss) to the statement of operations for the three months ended April 3, 2022 and April 4, 2021 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 3, April 4, 2022 2021 (in thousands) Available-for-sale Unrealized gains, net of tax of $18 and $123, respectively $ 65 $ 444 Other (income) Defined benefit pension and postretirement plans: Amortization of prior service cre dit 2 2 (a) Total reclassifications, net of tax of $18 and $123, respectively $ 67 $ 446 Net income (a) The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note P

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets (Tables)	3 Months Ended
	Apr. 03, 2022
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segments for the three months ended April 3, 2022, were as follows: Industrial Automation Wireless Test Semiconductor Test System Test Total (in thousands) Balance at December 31, 2021 Goodwill $ 405,971 $ 361,819 $ 262,101 $ 158,699 $ 1,188,590 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) Total goodwill 405,971 7,976 1,561 10,516 426,024 Foreign currency translation adjustment (6,122 ) — (14 ) — (6,136 ) Balance at April 3, 2022 Goodwill 399,849 361,819 262,087 158,699 1,182,454 Accumulated impairment losses — (353,843 ) (260,540 ) (148,183 ) (762,566 ) Total goodwill $ 399,849 $ 7,976 $ 1,547 $ 10,516 $ 419,888
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 Net Carrying Amount (in thousands) Balance at April 3, 2022 Developed technology $ 272,547 $ (226,648 ) $ (4,565 ) $ 41,334 Customer relationships 57,739 (49,492 ) 194 8,441 Tradenames and trademarks 59,387 (38,494 ) (822 ) 20,071 Total intangible assets $ 389,673 $ (314,634 ) $ (5,193 ) $ 69,846 Balance, December 31, 2021 Developed technology $ 272,547 $ (223,413 ) $ (4,093 ) $ 45,041 Customer relationships 57,739 (48,921 ) 209 9,027 Tradenames and trademarks 59,387 (37,237 ) (583 ) 21,567 Total intangible assets $ 389,673 $ (309,571 ) $ (4,467 ) $ 75,635
Schedule of Estimated Intangible Assets Amortization Expense	Estimated intangible asset amortization expense for each of the five succeeding fiscal years and thereafter Year Amortization Expense (in thousands) 2022 $ 14,879 2023 19,377 2024 19,069 2025 11,456 2026 2,404 Thereafter 2,661

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Apr. 03, 2022
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 3, April 4, 2022 2021 (in thousands, except per share amounts) Net income for basic and diluted net income per share $ 161,928 $ 205,512 Weighted average common shares-basic 162,048 166,491 Effect of dilutive potential common shares: Convertible note hedge warrant shares (1) 10,028 9,429 Incremental shares from assumed conversion of convertible notes (2) 2,541 10,310 Restricted stock units 875 1,395 Stock options 69 108 Employee stock purchase plan 14 7 Dilutive potential common shares 13,527 21,249 Weighted average common shares-diluted 175,575 187,740 Net income per common share-basic $ 1.00 $ 1.23 Net income per common share-diluted $ 0.92 $ 1.09 (1) Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.54, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. (2) Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.51, multiplied by 3.4 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Apr. 03, 2022
Defined Benefit Pension Plans
Net Periodic Pension and Postretirement Benefit Costs	For the three months ended April 3, 2022 and April 4, 2021, Teradyne’s net periodic pension cost was comprised of the following: For the Three Months Ended April 3, 2022 April 4, 2021 United States Foreign United States Foreign (in thousands) Service cost $ 397 $ 206 $ 453 $ 243 Interest cost 1,222 118 1,100 87 Expected return on plan assets (732 ) (20 ) (936 ) (16 ) Total net periodic pension cost $ 887 $ 304 $ 617 $ 314
Postretirement Benefit Plans
Net Periodic Pension and Postretirement Benefit Costs	For the three months ended April 3, 2022 and April 4, 2021, Teradyne’s net periodic postretirement benefit cost was comprised of the following: For the Three Months Ended April 3, April 4, (in thousands) Service cost $ 17 $ 16 Interest cost 44 44 Amortization of prior service credit (2 ) (2 ) Total net periodic postretirement benefit cost $ 59 $ 58

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Apr. 03, 2022
Reconciliation of Effective Tax Rate	A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows: For the Three Months Ended April 3, April 4, US statutory federal tax rate 21.0 % 21.0 % Non-deductible 1.1 0.8 Discrete benefit related to equity compensation (6.6 ) (6.2 ) Foreign taxes (3.4 ) (4.7 ) Tax credits (1.6 ) (1.3 ) International provisions of the U.S. Tax Cuts and Jobs Act of 2017 (1.3 ) (1.5 ) Other, net 1.0 0.2 Effective tax rate 10.2 % 8.3 %

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Apr. 03, 2022
Segment Information	Segment information for the three months ended April 3, 2022 and April 4, 2021 is as follows: Semiconductor Test System Test Industrial Automation Wireless Test Corporate and Eliminations Consolidated (in thousands) 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 Three Months Ended April 4, 2021 Revenues $ 528,063 $ 132,837 $ 79,951 $ 40,898 $ (143 ) $ 781,606 Income (loss) before income taxes (1)(2) 176,368 51,061 (12,967 ) 9,616 (85 ) 223,993 Total assets (3) 1,243,358 179,195 672,596 104,367 1,520,201 3,719,717 (1) Included in Corporate and Eliminations are: legal fees, contingent consideration fair value adjustments, interest income, interest expense, severance charges, net foreign exchange gains (losses), acquisition related charges and compensation, intercompany eliminations and for the three months ended April 4, 2021, loss on convertible debt conversions. (2) Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and, for the three months ended April 4, 2021, loss on convertible debt conversions. (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 3, April 4, (in thousands) Semiconductor Test: Cost of revenues—inventory charge $ — $ 1,079 Industrial Automation: Cost of revenues—inventory charge $ — $ 1,221 Wireless: Cost of revenues—inventory charge $ 877 $ — Corporate and Eliminations Restructuring and other— legal charge $ 14,700 $ — Restructuring and other—AutoGuide contingent consideration adjustment — (7,227 ) Other (income) expense, net—loss on convertible debt conversion s — 4,069 Restructuring and other—acquisition related expenses and compensation — (513 )

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Jan. 01, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Debt	$ 75,378		$ 89,244
Retained earnings	762,189		736,566
Mezzanine equity			1,512
Additional paid-in capital	$ 1,711,690		$ 1,811,545
Teradyne Member [Member]
Summary Of Significant Accounting Policies [Line Items]
Current debt,		$ 1,400
Debt		6,600
Retained earnings		92,800
Mezzanine equity		99,300
Additional paid-in capital		99,300
Teradyne Member [Member] | Accounting Standards Update 2020-06 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Mezzanine equity		$ 0

Investment In Other Company - A

Investment In Other Company - Additional Information (Details) - MachineMetrics, Inc [Member] - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Jun. 01, 2021
Schedule of Equity Method Investments [Line Items]
Long-term Investments	$ 12	$ 12
Unrealized Gain (Loss) on Investments	$ 0

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Deferred Revenue And Customer Advances	$ 35	$ 27.8
Deferred Revenue and Trade Accounts Receivable	19.4	$ 7.3
Revenue, Remaining Performance Obligation, Amount	$ 1,417.4
Short-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	89.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	12 months
Long-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	11.00%
Long-term Contract with Customer [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	3 years
Long-term Contract with Customer [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period	1 year

Disaggregated Revenue by Primar

Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2022	Apr. 04, 2021
Disaggregation of Revenue [Line Items]
Total	[1]	$ 755,370	$ 781,606
Semiconductor Test
Disaggregation of Revenue [Line Items]
Total		482,341	528,063
System Test
Disaggregation of Revenue [Line Items]
Total	[1]	118,668	132,837
Industrial Automation
Disaggregation of Revenue [Line Items]
Total		103,189	79,951
Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	51,518	40,898
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	(346)	(143)
Point in Time
Disaggregation of Revenue [Line Items]
Total	[1]	665,476	701,084
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	105,288	119,314
Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	16,534
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	48,429	37,880
Point in Time | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	(346)	(143)
Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	89,894	80,522
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	13,380	13,523
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	3,089	3,018
Over Time | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	0	0
Americas
Disaggregation of Revenue [Line Items]
Total	[1]	114,421	81,009
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	36,608	27,659
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	9,687	5,769
Americas | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	(346)	(143)
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	77,114	54,980
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	8,276	5,658
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	6,885	1,597
Europe, Middle East and Africa | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	0	0
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	563,835	645,617
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	[1]	73,784	99,520
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	[1]	34,946	33,532
Asia Pacific | Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Total	[1]	0	0
SOC
Disaggregation of Revenue [Line Items]
Total	[1]	386,585
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		420,230
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	323,456	364,190
SOC | Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	63,129
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		56,040
SOC | Americas
Disaggregation of Revenue [Line Items]
Total	[1]	29,714
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		20,779
SOC | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	16,130
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		12,215
SOC | Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	340,741
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		387,236
Memory
Disaggregation of Revenue [Line Items]
Total	[1]	95,756
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		107,833
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]	88,723	101,892
Memory | Over Time
Disaggregation of Revenue [Line Items]
Total	[1]	7,033
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		5,941
Memory | Americas
Disaggregation of Revenue [Line Items]
Total	[1]	2,046
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		3,420
Memory | Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	[1]	559
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		364
Memory | Asia Pacific
Disaggregation of Revenue [Line Items]
Total	[1]	93,151
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	[1]		104,049
Universal Robots (UR) | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	85,284	65,601
Universal Robots (UR) | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	83,182	64,007
Universal Robots (UR) | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	2,102	1,594
Universal Robots (UR) | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	28,148	18,153
Universal Robots (UR) | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	38,515	29,615
Universal Robots (UR) | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	18,621	17,833
MiR | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	17,208	14,131
MiR | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]		14,064
MiR | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	674	67
MiR | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	7,867	5,153
MiR | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	6,749	5,531
MiR | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	2,592	3,447
Autoguide LLC [Member] | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	697	219
Autoguide LLC [Member] | Point in Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	210	(120)
Autoguide LLC [Member] | Over Time | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	487	339
Autoguide LLC [Member] | Americas | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	697	219
Autoguide LLC [Member] | Europe, Middle East and Africa | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	0	0
Autoguide LLC [Member] | Asia Pacific | Industrial Automation
Disaggregation of Revenue [Line Items]
Total	[1]	$ 0	$ 0
[1]	Includes $3.1 million and $3.1 million in 2022 and 2021, 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. 03, 2022	Apr. 04, 2021
Accounting Policies [Abstract]
Revenue on leases	$ 2.3	$ 3.1

Deferred Revenue and Customer A

Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021	Apr. 04, 2021	Dec. 31, 2020
Deferred Revenue Arrangement
Maintenance, service and training	$ 83,212	$ 81,826
Customer advances, undelivered elements and other	58,521	55,112
Extended warranty	65,726	64,168	$ 53,908	$ 51,929
Total deferred revenue and customer advances	$ 207,459	$ 201,106

Composition of Inventories, Net

Composition of Inventories, Net (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw material	$ 187,856	$ 155,641
Work-in-process	30,877	37,740
Finished goods	40,608	49,949
Inventories, net	$ 259,341	$ 243,330

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Apr. 03, 2022	Dec. 31, 2021
Inventory [Line Items]
Inventory reserves	$ 112.8	$ 114.1

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	Mar. 25, 2022	Apr. 03, 2022	Apr. 04, 2021	Dec. 31, 2021
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized gain		$ 0.4	$ 1.2
Fair market value of investments with unrealized losses greater than one year		9.8		$ 6.5
Fair market value of investments with unrealized losses less than one year		248.2		85.4
Unrealized Gain (loss) on contracts		4.3	0.2
Equity securities unrealized loss		2.2	1.4
Available For Sale Securities Gross Realized Loss		0.2	$ 0
Debt Mutual Funds
Financial Instruments and Fair Value [Line Items]
Available for sale securities with out contractual maturity date		7
TER Auto Guide Llc [Member] | Dispute In Respect Of Contingent Consideration [Member]
Financial Instruments and Fair Value [Line Items]
Litigation Settlement, Amount settled between parties	$ 26.7
Foreign Exchange Contracts
Financial Instruments and Fair Value [Line Items]
Unrealized Gain (loss) on contracts		$ 0.5		$ 0.1

Schedule of Fair Value of Finan

Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	$ 366,113	$ 338,836
U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	119,837	77,789
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	179,481	189,620
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	53,161	56,901
Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	1,312	1,356
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	4,714	4,610
Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,030	7,971
Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	578	589
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	1,202,749	1,500,288
Derivative assets	9	92
Total	1,202,758	1,500,380
Derivative liabilities	469	118
Total	469	118
Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	508,245	628,740
Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	286,358	493,459
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	119,837	77,789
Fair Value, Measurements, Recurring | Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	179,481	189,620
Fair Value, Measurements, Recurring | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	53,161	56,901
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	1,312	1,356
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	4,714	4,610
Fair Value, Measurements, Recurring | Debt Mutual Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	7,030	7,971
Fair Value, Measurements, Recurring | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	578	589
Fair Value, Measurements, Recurring | Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	42,033	39,253
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	769,955	1,088,176
Derivative assets	0	0
Total	769,955	1,088,176
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	508,245	628,740
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	212,647	412,212
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 | 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 | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | 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	7,030	7,971
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	42,033	39,253
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	432,794	412,112
Derivative assets	9	92
Total	432,803	412,204
Derivative liabilities	469	118
Total	469	118
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	73,711	81,247
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	119,837	77,789
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	179,481	189,620
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	53,161	56,901
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	1,312	1,356
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	4,714	4,610
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 | Non-U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	578	589
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale equity securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total	0	0
Derivative assets	0	0
Total	0	0
Derivative liabilities	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | 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 | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | 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 | 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. 03, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 1,202,758	$ 1,500,380
Liabilities	469	118
Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	469	118
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	794,603	1,122,199
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	282,016	244,231
Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	126,130	133,858
Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	9	92
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	769,955	1,088,176
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	720,892	1,040,952
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	49,063	47,224
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	432,803	412,204
Liabilities	469	118
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	469	118
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	73,711	81,247
Significant Other Observable Inputs (Level 2) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	282,016	244,231
Significant Other Observable Inputs (Level 2) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	77,067	86,634
Significant Other Observable Inputs (Level 2) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	9	92
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Other Current Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Long-term marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	0	0
Significant Unobservable Inputs (Level 3) | Prepayments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets	$ 0	$ 0

Schedule of Changes in Fair Val

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2022	Apr. 04, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		$ 0	$ 7,227
Fair value adjustment	[1]	0	(7,227)
Balance at end of period		$ 0	$ 0
[1]	(a) In the three months ended April 4, 2021, the fair value of contingent consideration for the earn-outs in connection with the acquisition of AutoGuide was reduced to zero, which resulted in a benefit of $7.2 million, primarily due to a decrease in forecasted revenues and earnings before interest and taxes. As of April 3, 2022, the maximum amount of contingent consideration that could be paid in connection with the acquisition of AutoGuide is $87.7 million. The remaining earn-out period ends on December 31, 2022. The sellers of AutoGuide have filed an arbitration claim against Teradyne related to the earn-out alleging non-compliance with the earn-out obligations. In March 2022, both parties reached an agreement to settle it for $26.7 million.

Schedule of Changes in Fair V_2

Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase (decrease) in contingent consideration	$ 0	$ (7,227)
Autoguide LLC [Member] | Dispute In Respect Of Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase (decrease) in contingent consideration		$ 7,200

Schedule of Carrying Amounts an

Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Apr. 03, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 366,113	$ 338,836
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		794,603	1,122,199
Marketable securities		408,146	378,089
Derivative assets		9	92
Derivative liabilities		469	118
Convertible debt	[1]	95,875	108,426
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		794,603	1,122,199
Marketable securities		408,146	378,089
Derivative assets		9	92
Derivative liabilities		469	118
Convertible debt	[1]	$ 323,670	$ 604,648
[1]	(1) The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note, which includes the equity conversion features.

Schedule of Available for Sale

Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 368,154	$ 334,077
Available-for-sale marketable securities, Unrealized Gain	1,596	5,477
Available-for-sale marketable securities, Unrealized (Loss)	(3,637)	(718)
Available-for-sale marketable securities, Fair Market Value	366,113	338,836
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	257,991	91,937
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	121,504	77,707
Available-for-sale marketable securities, Unrealized Gain	8	551
Available-for-sale marketable securities, Unrealized (Loss)	(1,675)	(470)
Available-for-sale marketable securities, Fair Market Value	119,837	77,789
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	114,043	46,435
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	179,736	189,614
Available-for-sale marketable securities, Unrealized Gain	3	15
Available-for-sale marketable securities, Unrealized (Loss)	(258)	(9)
Available-for-sale marketable securities, Fair Market Value	179,481	189,620
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	106,951	22,784
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	53,079	52,266
Available-for-sale marketable securities, Unrealized Gain	1,585	4,863
Available-for-sale marketable securities, Unrealized (Loss)	(1,503)	(227)
Available-for-sale marketable securities, Fair Market Value	53,161	56,901
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	32,283	19,422
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,312	1,356
Available-for-sale marketable securities, Fair Market Value	1,312	1,356
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	4,795	4,617
Available-for-sale marketable securities, Unrealized Gain		5
Available-for-sale marketable securities, Unrealized (Loss)	(81)	(12)
Available-for-sale marketable securities, Fair Market Value	4,714	4,610
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	4,714	3,296
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	7,150	7,928
Available-for-sale marketable securities, Unrealized Gain		43
Available-for-sale marketable securities, Unrealized (Loss)	(120)
Available-for-sale marketable securities, Fair Market Value	7,030	7,971
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	578	589
Available-for-sale marketable securities, Fair Market Value	$ 578	$ 589

Schedule of Reported Available

Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 368,154	$ 334,077
Available-for-sale marketable securities, Unrealized Gain	1,596	5,477
Available-for-sale marketable securities, Unrealized (Loss)	(3,637)	(718)
Available-for-sale marketable securities, Fair Market Value	366,113	338,836
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	257,991	91,937
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	282,563	244,213
Available-for-sale marketable securities, Unrealized Gain	11	64
Available-for-sale marketable securities, Unrealized (Loss)	(558)	(46)
Available-for-sale marketable securities, Fair Market Value	282,016	244,231
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	202,243	54,798
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	85,591	89,864
Available-for-sale marketable securities, Unrealized Gain	1,585	5,413
Available-for-sale marketable securities, Unrealized (Loss)	(3,079)	(672)
Available-for-sale marketable securities, Fair Market Value	84,097	94,605
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 55,748	$ 37,139

Contractual Maturities of Inves

Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Apr. 03, 2022USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 282,563
Due after 1 year through 5 years, cost	36,844
Due after 5 years through 10 years, cost	6,117
Due after 10 years, cost	35,480
Total, cost	361,004
Due within one year, fair market value	282,016
Due after 1 year through 5 years, fair market value	35,718
Due after 5 years through 10 years, fair market value	5,978
Due after 10 years, fair maket value	35,371
Total, fair market value	$ 359,083

Schedule of Notional Amount of

Schedule of Notional Amount of Derivatives (Detail) - USD ($) $ in Millions	Apr. 03, 2022	Dec. 31, 2021
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 26.9	$ 41
Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(97.5)	(72.5)
Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	124.4	113.5
Japanese Yen
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(45.9)	(31.4)
Japanese Yen | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(45.9)	(31.4)
Taiwan Dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(43.7)	(35.1)
Taiwan Dollar | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(43.7)	(35.1)
Korean Won
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(5)	(4.2)
Korean Won | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(5)	(4.2)
British Pound Sterling
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(2.9)	(1.8)
British Pound Sterling | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Liability, Notional amounts	(2.9)	(1.8)
Euro
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	42.3	44.9
Euro | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	42.3	44.9
Singapore Dollar
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	75.5	61.9
Singapore Dollar | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	75.5	61.9
Philippines, Pesos
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	3.8	3.9
Philippines, Pesos | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	3.8	3.9
China, Yuan Renminbi
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	2.8	2.8
China, Yuan Renminbi | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Derivative Asset, Notional amounts	$ 2.8	$ 2.8

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position at Fair Value (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net	$ (460)	$ (26)
Not Designated as Hedging Instrument | Foreign currency forward contracts | Prepayments
Derivatives, Fair Value [Line Items]
Derivative assets	9	92
Not Designated as Hedging Instrument | Foreign currency forward contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (469)	$ (118)

Schedule of Effect of Derivativ

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Losses (Gains) on derivatives recognized in statements of operations	$ (1,752)	$ 2,118

Schedule of Effect of Derivat_2

Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on foreign currency transactions	$ 4.3	$ 0.2

Debt - Additional Information (

Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands	May 06, 2022USD ($)	May 01, 2020USD ($)	Dec. 12, 2016USD ($)Day$ / sharesshares	Apr. 03, 2022USD ($)$ / sharesshares	Apr. 04, 2021USD ($)shares	Oct. 03, 2021USD ($)$ / shares	Dec. 31, 2022USD ($)	Jan. 01, 2022USD ($)	Dec. 31, 2021USD ($)	Dec. 10, 2021USD ($)	Dec. 31, 2020USD ($)
Debt Instrument
Repurchase of common stock				$ 201,465	$ 45,188
Repurchase of stock, shares | shares				1,800,000	400,000
Trading days measurement period | Day			5
Debt instrument conversion price | $ / shares				$ 31.51
Shares that would be issued upon conversion | shares				3.4
Debt issuance costs, amortization period				7 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases										$ 200,000
Line of Credit Facility, Interest Rate Description		The interest rate applicable to loans under the Credit Facility are, at Teradyne’s option, equal to either a base rate plus a margin ranging from 0.00% to 0.75% per annum or LIBOR plus a margin ranging from 1.00% to 1.75% per annum, based on the consolidated leverage ratio of Teradyne. In addition, Teradyne will pay a commitment fee on the unused portion of the commitments under the Credit Facility ranging from 0.15% to 0.25% per annum, based on the then applicable consolidated leverage ratio.
Term of revolving credit facility		3 years
Current debt, Conversion				$ 20,497					$ 19,182
Mezzanine equity									1,512
Convertible common shares				20,700
Debt				75,378					89,244
Retained earnings				$ 762,189					736,566
Long Term Debt Maturities Repayments Of Principal Interest Payments In Next Twelve Months									1,200
Long Term Debt Maturities Repayments Of Principal Intereat Payments Thereafter							$ 1,200
Available Incremental Amount Under The Credit Facility Not To Exceed Percentage Of Consolidated EBIDTA				15.00%
Convertible Common Shares [Member]
Debt Instrument
Mezzanine equity				$ 20,500
Shares Issued, Stock Options Exercised						$ 500
Subsequent Event [Member]
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity	$ 0
Collateral Pledged [Member]
Debt Instrument
Line of Credit Facility, Interest Rate Description		65
1.25% Convertible Senior Unsecured Notes Due December 15, 2023
Debt Instrument
Aggregate principal amount			$ 460,000								$ 460,000
Debt instrument, interest rate, stated percentage			1.25%
Debt instrument, net proceeds after issuance costs			$ 450,800
Payment for net cost of convertible note hedges net of warrant proceeds			33,000	$ 33,000
Repurchase of common stock			$ 50,100
Repurchase of stock, shares | shares			2,000,000
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			$ 31.51	$ 31.51		$ 31.51
Shares that would be issued upon conversion | shares			14,600,000
Strike price per share of warrant | $ / shares				$ 39.54
Debt instrument, convertible, carrying amount of equity component									$ 100,800
Debt issuance fees				$ 400
Value of notes converted				$ 355,600
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Subsequent Event [Member]
Debt Instrument
Debt instrument conversion converted instrument amount	$ 373,500
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			130.00%
1.25% Convertible Senior Unsecured Notes Due December 15, 2023 | Conversion option two
Debt Instrument
Aggregate principal amount			$ 1,000
Percentage of closing sale price of common stock and conversion rate product			98.00%
Teradyne [Member]
Debt Instrument
Current debt, Conversion								$ 1,400
Mezzanine equity								99,300
Debt								6,600
Retained earnings								92,800
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) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Debt Instrument
Current debt	$ 20,497	$ 19,182
Long-term debt	75,378	89,244
Net carrying amount of convertible debt	95,875	108,426
Convertible Senior Notes [Member]
Debt Instrument
Debt principal	96,285	116,980
Unamortized debt issuance fees	410	8,554
Net carrying amount of convertible debt	$ 95,875	$ 108,426

Interest Expense on Convertible

Interest Expense on Convertible Senior Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Debt Instrument
Contractual interest expense on the coupon	$ 311	$ 1,239
Amortization of debt issuance fees recognized as interest expense	66	3,836
Total interest expense on the convertible debt	$ 377	$ 5,075

Interest Expense on Convertib_2

Interest Expense on Convertible Senior Notes (Parenthetical) (Detail) $ in Millions	Dec. 31, 2021USD ($)
Debt Instrument [Line Items]
Unamortized debt discount	$ 8.1

Prepayments (Detail)

Prepayments (Detail) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments	$ 441,665	$ 364,478
Prepaid maintenance and other services	14,772	13,660
Prepaid taxes	10,756	15,090
Other prepayments	12,221	13,038
Total prepayments	$ 479,414	$ 406,266

Product Warranty (Detail)

Product Warranty (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 24,577	$ 16,633
Accruals for warranties issued during the period	4,100	11,881
Accruals related to pre-existing warranties	(2,758)	447
Settlements made during the period	(5,814)	(5,068)
Balance at end of period	$ 20,105	$ 23,893

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. 03, 2022	Apr. 04, 2021
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 64,168	$ 51,929
Deferral of new extended warranty revenue	11,774	7,517
Recognition of extended warranty deferred revenue	(10,216)	(5,538)
Balance at end of period	$ 65,726	$ 53,908

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - $ / shares shares in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Stock price	$ 112.12	$ 113.48
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	$ 0.40
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 annual installments	4 years
Percentage of awards vesting on the first anniversary of grant date	100.00%
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 annual 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	3 years
Minimum age of retirement to be eligible for PRSUs	60 years
Minimum years of service for retirement to be eligible for PRSUs	10 years
Stock price	$ 0.40	$ 113.48
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	112.12
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	0.00%
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved	200.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of common stock price paid	100.00%
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	$ 101.06	$ 125.02
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted	0.4	0.3
Weighted average grant date fair value of restricted stock units granted	$ 111.31	$ 112.55
Service-Based Restricted Stock Units | Executive Officer
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	$ 39.01	36.60
Service-Based Restricted Stock Units | Non Employee Directors
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	$ 110.84	$ 112.28

Schedule of Estimated Fair Valu

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions (Detail)	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
New York Stock Exchange Composite Index
Share-based Compensation Arrangement by Share-based Payment Award
Expected historical volatility	22.70%	22.90%
TSR Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate	1.40%	0.20%
Expected historical volatility	47.10%	43.90%
Dividend yield	0.40%	0.40%

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. 03, 2022	Apr. 04, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (years)	4 years	5 years
Risk-free interest rate	1.60%	0.40%
Volatility-historical	43.70%	37.80%
Dividend yield	0.40%	0.40%

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,562,444	$ 2,207,018
Other comprehensive (loss) income	(13,531)	(24,839)
Balance	2,474,532	2,324,553
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(10,818)	25,389
Other comprehensive (loss) income before reclassifications, net of tax	(8,076)	(21,123)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive (loss) income	(8,076)	(21,123)
Balance	(18,894)	4,266
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	3,704	6,954
Other comprehensive (loss) income before reclassifications, net of tax	(5,388)	(3,270)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(65)	(444)
Other comprehensive (loss) income	(5,453)	(3,714)
Balance	(1,749)	3,240
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,166	1,173
Other comprehensive (loss) income before reclassifications, net of tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(2)	(2)
Other comprehensive (loss) income	(2)	(2)
Balance	1,164	1,171
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(5,948)	33,516
Other comprehensive (loss) income before reclassifications, net of tax	(13,464)	(24,393)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(67)	(446)
Other comprehensive (loss) income	(13,531)	(24,839)
Balance	$ (19,479)	$ 8,677

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ 18	$ 123
Foreign currency translation adjustments, tax	0	0	$ 0	$ 0
Unrealized (losses) gains on marketable securities, tax	296	879	1,055	1,910
Retirement plans prior service benefit, tax	1,128	1,126	$ 1,128	$ 1,126
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	1,333	908
Amounts reclassified from accumulated other comprehensive income (loss), tax	18	123
Other comprehensive income (loss), tax	1,351	1,031
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. 03, 2022	Apr. 04, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (expense)	$ 65	$ 444
Retirement Plans 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	$ 67	$ 446

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. 03, 2022	Apr. 04, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	$ 18	$ 123
Unrealized (Losses) Gains on Marketable Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, tax	18	123
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. 03, 2022	Apr. 04, 2021
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired intangible assets amortization	$ 5,063	$ 5,536

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Apr. 03, 2022
Goodwill [Line Items]
Goodwill	$ 1,188,590	$ 1,182,454
Accumulated impairment losses	(762,566)	(762,566)
Total goodwill	426,024	419,888
Foreign currency translation adjustment	(6,136)
Industrial Automation
Goodwill [Line Items]
Goodwill	405,971	399,849
Total goodwill	405,971	399,849
Foreign currency translation adjustment	(6,122)
Wireless Test
Goodwill [Line Items]
Goodwill	361,819	361,819
Accumulated impairment losses		(353,843)
Total goodwill	7,976	7,976
Foreign currency translation adjustment	0
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,101	262,087
Accumulated impairment losses		(260,540)
Total goodwill	1,561	1,547
Foreign currency translation adjustment	(14)
System Test
Goodwill [Line Items]
Goodwill	158,699	158,699
Accumulated impairment losses		(148,183)
Total goodwill		$ 10,516
Foreign currency translation adjustment	$ 0

Schedule of Amortizable Intangi

Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 389,673		$ 389,673
Accumulated Amortization	(314,634)		(309,571)
Foreign Currency Translation Adjustment	(5,193)	$ (4,467)
Net Carrying Amount	69,846		75,635
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	272,547		272,547
Accumulated Amortization	(226,648)		(223,413)
Foreign Currency Translation Adjustment	(4,565)	(4,093)
Net Carrying Amount	41,334		45,041
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	57,739		57,739
Accumulated Amortization	(49,492)		(48,921)
Foreign Currency Translation Adjustment	194	209
Net Carrying Amount	8,441		9,027
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	59,387		59,387
Accumulated Amortization	(38,494)		(37,237)
Foreign Currency Translation Adjustment	(822)	$ (583)
Net Carrying Amount	$ 20,071		$ 21,567

Schedule of Estimated Intangibl

Schedule of Estimated Intangible Asset Amortization Expense (Detail) $ in Thousands	Apr. 03, 2022USD ($)
Finite-Lived Intangible Assets
2022	$ 14,879
2023	19,377
2024	19,069
2025	11,456
2026	2,404
Thereafter	$ 2,661

Computation of Basic and Dilute

Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Net Income Loss Per Common Share
Net income for basic and diluted net income per share	$ 161,928	$ 205,512
Weighted average common shares-basic	162,048	166,491
Convertible note hedge warrant shares	10,028	9,429
Incremental shares from assumed conversion of convertible notes	2,541	10,310
Employee stock purchase plan	14	7
Dilutive potential common shares	13,527	21,249
Weighted average common shares-diluted	175,575	187,740
Net income per common share-basic	$ 1	$ 1.23
Net income per common share-diluted	$ 0.92	$ 1.09
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements	875	1,395
Stock Options
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements	69	108

Computation of Basic and Dilu_2

Computation of Basic and Diluted Net Income Per Common Share (Parenthetical) (Detail)	3 Months Ended
	Apr. 03, 2022$ / sharesshares
Net Income Loss Per Common Share
Initial debt conversion price | $ / shares	$ 31.51
Shares that would be issued upon conversion | shares	3.4
Convertible Notes Hedge Warrant
Net Income Loss Per Common Share
Initial debt conversion price | $ / shares	$ 39.54
Shares that would be issued upon conversion | shares	14,600,000

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Net Income Loss Per Common Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.1	0.1

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended
	May 25, 2022	Apr. 03, 2022	Dec. 31, 2021	Apr. 04, 2021
Restructuring Cost and Reserve
Contingent consideration adjustment		$ 0		$ (7,227)
Settled Litigation [Member]
Restructuring Cost and Reserve
Legal settlement charges		$ 14,700	$ 12,000
Semiconductor Test, Industrial Automation and Corporate | Mobile Industrial Robots (MiR)
Restructuring Cost and Reserve
Contingent consideration adjustment				$ 7,200
TER Corporate And Eliminations | TER Dispute In Respect Of Contingent Consideration [Member]
Restructuring Cost and Reserve
Litigation Settlement, Amount settled between parties	$ 26,700

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - United States Plans - Annuity Plan For Participants In The US Qualified Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Defined Benefit Plan Disclosure
Pension benefit obligation acturial gain loss	$ 0.8	$ 0.8
Defined benefit obligation increase decrease for remeasurement due to settlement	$ 0.3	$ 0.3

Schedule of Net Periodic Pensio

Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Defined Benefit Plan Disclosure
Service cost	$ 17	$ 16
Interest cost	44	44
Amortization of prior service cost	(2)	(2)
Total net periodic pension cost	59	58
UNITED STATES
Defined Benefit Plan Disclosure
Service cost	397	453
Interest cost	1,222	1,100
Expected return on plan assets	(732)	(936)
Total net periodic pension cost	887	617
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	206	243
Interest cost	118	87
Expected return on plan assets	(20)	(16)
Total net periodic pension cost	$ 304	$ 314

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Mar. 08, 2021	Mar. 31, 2022	Apr. 03, 2022	Dec. 31, 2021
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments			$ 904
Purchase commitments less than one year			826.7
Product warranty accrual			20.1	$ 24.6
Revenue deferrals related to extended warranties			$ 65.7	$ 64.2
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

Schedule of Reconciliation of E

Schedule of Reconciliation of Effective Tax Rate (Detail)	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Income Tax Disclosure [Line Items]
US statutory federal tax rate	21.00%	21.00%
Non-deductible officers' compensation	1.10%	0.80%
Discrete benefit related to equity compensation	(6.60%)	(6.20%)
Foreign taxes	(3.40%)	(4.70%)
Tax credits	(1.60%)	(1.30%)
International provisions of the U.S. Tax Cuts and Jobs Act of 2017	(1.30%)	(1.50%)
Other, net	1.00%	0.20%
Effective tax rate	10.20%	8.30%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021	Dec. 31, 2021
Income Taxes [Line Items]
Tax savings due to the tax holiday	$ 3.5	$ 6.2
Tax savings due to the tax holiday, per share	$ 0.02	$ 0.03
Accrued interest and penalties	$ 0.3		$ 0.3
Interest and penalties related to income tax, expense (benefit)	0.1	$ 0.1
Uncertain tax positions	14.6		$ 14.5
Net decrease in reserves for uncertain tax positions	(0.1)
Possible Lapse Of Statutes Of Limitations [Member]
Income Taxes [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 0.2

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended
	Apr. 03, 2022Segment
Segment Reporting Information [Line Items]
Number of Operating Segments	4

Schedule of Segment Information

Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2022		Apr. 04, 2021		Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	[1]	$ 755,370		$ 781,606
Income (loss) before income taxes	[2],[3]	180,359		223,993
Total assets		3,609,154	[4]	3,719,717	[4]	$ 3,809,425
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		482,341		528,063
Income (loss) before income taxes	[2],[3]	149,705		176,368
Total assets	[4]	1,296,070		1,243,358
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	118,668		132,837
Income (loss) before income taxes	[2],[3]	41,322		51,061
Total assets	[4]	187,283		179,195
Industrial Automation
Segment Reporting Information [Line Items]
Revenues		103,189		79,951
Income (loss) before income taxes	[2],[3]	(5,098)		(12,967)
Total assets	[4]	675,560		672,596
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	51,518		40,898
Income (loss) before income taxes	[2],[3]	18,619		9,616
Total assets	[4]	113,821		104,367
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		(346)		(143)
Income (loss) before income taxes	[2],[3]	(24,189)		(85)
Total assets	[4]	$ 1,336,420		$ 1,520,201
[1]	Includes $3.1 million and $3.1 million in 2022 and 2021, 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: legal fees, contingent consideration fair value adjustments, interest income, interest expense, severance charges, net foreign exchange gains (losses), acquisition related charges and compensation, intercompany eliminations and for the three months ended April 4, 2021, loss on convertible debt conversions.
[3]	Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and, for the three months ended April 4, 2021, loss on convertible debt conversions.
[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. 03, 2022	Apr. 04, 2021
Segment Reporting Information [Line Items]
Restructuring and other—AutoGuide contingent consideration adjustment	$ 0	$ (7,227)
Other (income) expense, net - loss on convertible debt conversion	(5,187)	(3,824)
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge		1,079
Industrial Automation
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge		1,221
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	877
Corporate And Eliminations | Restructuring and other
Segment Reporting Information [Line Items]
Restructuring and other—legal settlement charge	14,700	0
Restructuring and other—AutoGuide contingent consideration adjustment	0	(7,227)
Other (income) expense, net - loss on convertible debt conversion	0	4,069
Restructuring and other—acquisition related expenses and compensation	$ 0	$ (513)

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021	Jan. 01, 2022	Jan. 31, 2021
Treasury Stock Amount Due To Be Repurchased	$ 801,500
Cumulative repurchases, shares	1.8	0.4
Common stock average price	$ 115.12	$ 120.73
Dividends Payable, Amount Per Share			$ 0.11	$ 0.10
Dividend payment	$ 17,895	$ 16,667
Percentage of increase in cash dividend rate per share	10.00%
Share Repurchase Program [Member]
Treasury Stock Amount Due To Be Repurchased	$ 201,500	$ 45,200
Two Thousand And Twenty One Share Purchase Programme [Member]
Stock repurchase program, authorized amount			$ 2,000,000
Treasury Stock Amount Due To Be Repurchased	$ 750,000
Common stock average price	$ 122.89
Treasury Stock, Value	$ 2,000,000
Treasury Stock, Shares	6.5