Schedule of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2022		Apr. 04, 2021		Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	[1]	$ 755,370		$ 781,606
Income (loss) before income taxes	[2],[3]	180,359		223,993
Total assets		3,609,154	[4]	3,719,717	[4]	$ 3,809,425
Semiconductor Test
Segment Reporting Information [Line Items]
Revenues		482,341		528,063
Income (loss) before income taxes	[2],[3]	149,705		176,368
Total assets	[4]	1,296,070		1,243,358
System Test
Segment Reporting Information [Line Items]
Revenues	[1]	118,668		132,837
Income (loss) before income taxes	[2],[3]	41,322		51,061
Total assets	[4]	187,283		179,195
Industrial Automation
Segment Reporting Information [Line Items]
Revenues		103,189		79,951
Income (loss) before income taxes	[2],[3]	(5,098)		(12,967)
Total assets	[4]	675,560		672,596
Wireless Test
Segment Reporting Information [Line Items]
Revenues	[1]	51,518		40,898
Income (loss) before income taxes	[2],[3]	18,619		9,616
Total assets	[4]	113,821		104,367
Corporate And Eliminations
Segment Reporting Information [Line Items]
Revenues		(346)		(143)
Income (loss) before income taxes	[2],[3]	(24,189)		(85)
Total assets	[4]	$ 1,336,420		$ 1,520,201

[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.

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