CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2024		Jul. 02, 2023		Jun. 30, 2024		Jul. 02, 2023
Revenues:
Total revenues		$ 729,879	[1]	$ 684,437	[1]	$ 1,329,698	[2]	$ 1,301,966	[2]
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		304,035		281,945		564,572		543,054
Gross profit		425,844		402,492		765,126		758,912
Operating expenses:
Selling and administrative		154,470		145,695		303,658		296,650
Engineering and development		111,816		105,706		215,015		211,468
Acquired intangible assets amortization		4,664		4,825		9,361		9,627
Restructuring and other		2,012		6,358		6,440		8,395
Gain on sale of business		(57,486)		0		(57,486)		0
Total operating expenses		215,476		262,584		476,988		526,140
Income from operations		210,368		139,908		288,138		232,772
Non-operating (income) expense:
Interest income		(6,715)		(6,354)		(14,582)		(11,613)
Interest expense		1,530		1,045		2,190		2,031
Other (income) expense, net		(3,850)		815		8,225		868
Income before income taxes	[3],[4]	219,403		144,402		292,305		241,486
Income tax provision		33,130		24,352		41,835		37,905
Net income		$ 186,273		$ 120,050		$ 250,470		$ 203,581
Net income per common share:
Basic		$ 1.18		$ 0.78		$ 1.61		$ 1.31
Diluted		$ 1.14		$ 0.73		$ 1.54		$ 1.23
Weighted average common shares—basic		157,804		154,760		155,426		155,332
Weighted average common shares—diluted		163,470		164,751		162,909		165,530
Product [Member]
Revenues:
Total revenues		$ 596,877		$ 540,375		$ 1,055,310		$ 1,013,793
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		250,236		217,011		450,999		415,675
Service [Member]
Revenues:
Total revenues		133,002		144,062		274,388		288,173
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 53,799		$ 64,934		$ 113,573		$ 127,379

[1] Includes $0.8 million and $1.3 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

[2] Includes $1.7 million and $2.5 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”

[3] Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, severance charges, pension, acquisition and divestiture related fees, and an expense for the modification of outstanding equity awards.

[4] Included in income (loss) before taxes are charges related to restructuring and other, expense for the modification of outstanding equity awards, and inventory charges.