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		$ 1.00	$ 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.