Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024		Apr. 02, 2023		Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenues	[1]	$ 599,819		$ 617,529
Income (loss) before income taxes	[2],[3]	72,902		97,084
Total assets		3,410,720	[4]	3,383,407	[4]	$ 3,486,824
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	75,322		74,631
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	24,589		38,675
Operating Segments
Segment Reporting Information [Line Items]
Revenues		599,819		617,529
Income (loss) before income taxes	[2],[3]	82,865		102,322
Total assets	[4]	2,321,469		2,324,487
Operating Segments | Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		412,254		415,009
Income (loss) before income taxes	[2],[3]	79,414		96,185
Total assets	[4]	1,348,829		1,386,851
Operating Segments | System Test
Segment Reporting Information [Line Items]
Revenues		75,322		74,631
Income (loss) before income taxes	[2],[3]	18,391		15,275
Total assets	[4]	181,803		173,669
Operating Segments | Robotics
Segment Reporting Information [Line Items]
Revenues		87,654		89,214
Income (loss) before income taxes	[2],[3]	(14,047)		(18,490)
Total assets	[4]	721,318		676,092
Operating Segments | Wireless Test
Segment Reporting Information [Line Items]
Revenues		24,589		38,675
Income (loss) before income taxes	[2],[3]	(893)		9,352
Total assets	[4]	69,519		87,875
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		0		0
Income (loss) before income taxes	[2],[3]	(9,963)		(5,238)
Total assets	[4]	$ 1,089,251		$ 1,058,920

[1] Includes $0.9 million and $1.3 million in the three months ended March 31, 2024 and in the three months ended April 2, 2023, 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: 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.

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

[4] Total assets are attributable to each segment. Semiconductor Test includes $33.9 million of total assets classified as assets held for sale. See Note E: "Assets held for sale" for additional information. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.