CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 29, 2024		Oct. 01, 2023		Sep. 29, 2024		Oct. 01, 2023
Revenues:
Total revenues	$ 737,298	[1]	$ 703,732	[1]	$ 2,066,996	[2]	$ 2,005,699	[2]
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	300,784		305,441		865,357		848,495
Gross profit	436,514		398,291		1,201,639		1,157,204
Operating expenses:
Selling and administrative	157,649		138,330		461,307		434,979
Engineering and development	117,474		104,413		332,489		315,881
Acquired intangible assets amortization	4,748		4,720		14,108		14,348
Restructuring and other	4,578		6,856		11,018		15,251
Gain on sale of business	0		0		(57,486)		0
Total operating expenses	284,449		254,319		761,436		780,459
Income from operations	152,065		143,972		440,203		376,745
Non-operating (income) expense:
Interest income	(5,076)		(6,873)		(19,658)		(18,486)
Interest expense	808		963		2,998		2,994
Other (income) expense, net	(2,651)		5,602		5,574		6,470
Income before income taxes and equity in net earnings of affiliate	158,984		144,280		451,289		385,767
Income tax provision	12,260		16,164		54,095		54,069
Income before equity in net earnings of affiliate	146,724		128,116		397,194		331,698
Equity in net earnings of affiliate	(1,075)				(1,075)
Net income	$ 145,649		$ 128,116		$ 396,119		$ 331,698
Net income per common share:
Basic	$ 0.89		$ 0.83		$ 2.51		$ 2.14
Diluted	$ 0.89		$ 0.78		$ 2.42		$ 2.01
Weighted average common shares—basic	163,002		153,762		157,951		154,809
Weighted average common shares—diluted	164,253		164,050		163,357		165,037
Product [Member]
Revenues:
Total revenues	$ 612,871		$ 551,982		$ 1,668,181		$ 1,565,776
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	253,129		239,827		704,129		655,502
Service [Member]
Revenues:
Total revenues	124,427		151,750		398,815		439,923
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)	$ 47,655		$ 65,614		$ 161,228		$ 192,993

[1] Includes $0.8 million and $1.4 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 $2.5 million and $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”