CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jul. 03, 2022		Jul. 04, 2021		Jul. 03, 2022		Jul. 04, 2021
Revenues:
Total revenues		$ 840,766	[1]	$ 1,085,728	[1]	$ 1,596,136	[2]	$ 1,867,334	[2]
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		334,377		438,739		634,814		758,727
Gross profit		506,389		646,989		961,322		1,108,607
Operating expenses:
Selling and administrative		139,533		140,187		279,718		269,984
Engineering and development		111,951		110,021		220,067		210,423
Acquired intangible assets amortization		4,871		5,402		9,934		10,938
Restructuring and other		2,044		2,507		17,758		(4,623)
Total operating expenses		258,399		258,117		527,477		486,722
Income from operations		247,990		388,872		433,845		621,885
Non-operating (income) expense:
Interest income		(951)		(633)		(1,653)		(1,441)
Interest expense		913		5,566		1,925		11,569
Other (income) expense, net		9,436		(87)		14,622		3,738
Income before income taxes	[3],[4]	238,592		384,026		418,951		608,019
Income tax provision		40,805		55,707		59,236		74,188
Net income		$ 197,787		$ 328,319		$ 359,715		$ 533,831
Net income per common share:
Basic		$ 1.24		$ 1.98		$ 2.24		$ 3.21
Diluted		$ 1.16		$ 1.76		$ 2.07		$ 2.85
Weighted average common shares—basic		159,563		165,995		160,805		166,243
Weighted average common shares—diluted		171,159		186,750		173,367		187,245
Product [Member]
Revenues:
Total revenues		$ 697,954		$ 951,945		$ 1,323,829		$ 1,612,453
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		274,674		388,845		517,690		656,629
Service [Member]
Revenues:
Total revenues		142,812		133,783		272,307		254,881
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 59,703		$ 49,894		$ 117,124		$ 102,098

[1] Includes $1.9 million and $4.2 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] Includes $4.2 million and $7.3 million in 2022 and 2021, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”

[3] Included in Corporate and Eliminations are: legal and environmental fees, contingent consideration fair value adjustments, interest income, interest expense, severance charges, net foreign exchange gains (losses), acquisition related charges and compensation, pension, intercompany eliminations and for the three and six months ended July 4, 2021, loss on convertible debt conversions.

[4] Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges and, for the three and six months ended July 4, 2021, loss on convertible debt conversions.