Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Oct. 01, 2023		Oct. 02, 2022		Oct. 01, 2023		Oct. 02, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues		$ 703,732	[1]	$ 827,073	[1]	$ 2,005,699	[2]	$ 2,423,209	[2]
Income (loss) before income taxes	[3],[4]	144,280		226,197		385,767		645,148
Total assets		3,370,655	[5]	3,319,906	[5]	3,370,655	[5]	3,319,906	[5]	$ 3,501,252
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		497,863		575,704		1,387,580		1,599,392
Income (loss) before income taxes	[3],[4]	136,451		182,625		361,676		510,112
Total assets	[5]	1,382,444		1,366,478		1,382,444		1,366,478
System Test
Segment Reporting Information [Line Items]
Revenues		83,203	[1]	116,154	[1]	252,106	[2]	369,525	[2]
Income (loss) before income taxes	[3],[4]	23,754		40,201		67,629		135,566
Total assets	[5]	178,904		192,684		178,904		192,684
Robotics
Segment Reporting Information [Line Items]
Revenues		85,692		89,067		246,541		292,772
Income (loss) before income taxes	[3],[4]	(21,812)		(3,992)		(66,704)		(15,496)
Total assets	[5]	684,207		614,558		684,207		614,558
Wireless Test
Segment Reporting Information [Line Items]
Revenues		36,974	[1]	46,148	[1]	119,472	[2]	161,520	[2]
Income (loss) before income taxes	[3],[4]	9,469		12,647		30,841		56,659
Total assets	[5]	92,514		110,484		92,514		110,484
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) before income taxes	[3],[4]	(3,582)		(5,284)		7,675		(41,693)
Total assets	[5]	$ 1,032,586		$ 1,035,702		$ 1,032,586		$ 1,035,702

[1] Includes $1.4 million and $1.8 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 $3.9 million and $5.9 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, contract termination settlement charge 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.