Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jul. 02, 2023		Jul. 03, 2022		Jul. 02, 2023		Jul. 03, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues		$ 684,437	[1]	$ 840,766	[1]	$ 1,301,966	[2]	$ 1,596,136	[2]
Income (loss) before income taxes	[3],[4]	144,402		238,592		241,486		418,951
Total assets		3,394,896	[5]	3,488,426	[5]	3,394,896	[5]	3,488,426	[5]	$ 3,501,252
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		474,708		541,348		889,717		1,023,688
Income (loss) before income taxes	[3],[4]	129,040		177,782		225,225		327,487
Total assets	[5]	1,416,109		1,449,878		1,416,109		1,449,878
System Test
Segment Reporting Information [Line Items]
Revenues		94,272	[1]	134,702	[1]	168,903	[2]	253,371	[2]
Income (loss) before income taxes	[3],[4]	28,599		54,042		43,874		95,365
Total assets	[5]	191,002		229,359		191,002		229,359
Robotics
Segment Reporting Information [Line Items]
Revenues		71,634		101,055		160,848		204,244
Income (loss) before income taxes	[3],[4]	(26,401)		(6,406)		(44,891)		(11,504)
Total assets	[5]	685,132		644,099		685,132		644,099
Wireless Test
Segment Reporting Information [Line Items]
Revenues		43,823	[1]	63,854	[1]	82,498	[2]	115,372	[2]
Income (loss) before income taxes	[3],[4]	12,020		25,393		21,372		44,012
Total assets	[5]	88,869		118,445		88,869		118,445
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues		0		(193)		0		(539)
Income (loss) before income taxes	[3],[4]	1,144		(12,219)		(4,094)		(36,409)
Total assets	[5]	$ 1,013,784		$ 1,046,645		$ 1,013,784		$ 1,046,645

[1] Includes $1.3 million and $1.9 million in 2023 and 2022, 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 $4.2 million in 2023 and 2022, respectively, for leases of Teradyne’s systems recognized outside ASC 606 “Revenue from Contracts with Customers.”

[3] Included in Corporate and Eliminations are: interest income, interest expense, net foreign exchange gains (losses), intercompany eliminations, legal and environmental fees, severance charges, pension, and an expense for the modification of Teradyne’s former chief executive officer’s outstanding equity awards.

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

[5] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities, and certain other assets.