CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	[1],[2]	$ 3,702,881	$ 3,121,469	$ 2,294,965
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		1,496,225	1,335,728	955,136
Gross profit		2,206,656	1,785,741	1,339,829
Operating expenses:
Selling and administrative		547,559	464,769	437,084
Engineering and development		427,609	374,964	322,824
Acquired intangible assets amortization		21,456	30,803	40,147
Restructuring and other		9,312	(13,202)	(13,880)
Total operating expenses		1,005,936	857,334	786,175
Income from operations		1,200,720	928,407	553,654
Non-operating (income) expenses:
Interest income		(2,627)	(5,982)	(16,990)
Interest expense		17,820	24,182	22,224
Other (income) expense, net		24,572	9,192	22,648
Income before income taxes	[3],[4]	1,160,955	901,015	525,772
Income tax provision		146,366	116,868	58,304
Net income		$ 1,014,589	$ 784,147	$ 467,468
Net income per common share:
Basic		$ 6.15	$ 4.72	$ 2.74
Diluted		$ 5.53	$ 4.28	$ 2.60
Weighted average common shares—basic		164,960	166,120	170,425
Weighted average common shares—diluted		183,625	183,042	179,459
Product [Member]
Revenues:
Total revenues		$ 3,196,575	$ 2,690,906	$ 1,887,674
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		1,300,106	1,157,476	782,047
Service [Member]
Revenues:
Total revenues		506,306	430,563	407,291
Cost of revenues:
Total cost of revenues (exclusive of acquired intangible assets amortization shown separately below)		$ 196,119	$ 178,252	$ 173,089

[1] Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”

[2] Revenues attributable to a country are based on location of customer site.

[3] Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation.

[4] Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges.