Disaggregated Revenue by Primary Geographical Market, Major Product Line and Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 29, 2024	[1]	Oct. 01, 2023		Sep. 29, 2024	[2]	Oct. 01, 2023
Disaggregation of Revenue [Line Items]
Total	$ 737,298		$ 703,732	[1]	$ 2,066,996		$ 2,005,699	[2]
System Test
Disaggregation of Revenue [Line Items]
Total	73,312		83,203	[1]	209,435		252,106	[2]
Wireless Test
Disaggregation of Revenue [Line Items]
Total	32,601		36,974	[1]	93,457		119,472	[2]
Point in Time
Disaggregation of Revenue [Line Items]
Total	638,836		599,099	[1]	1,764,241		1,692,038	[2]
Point in Time | System Test
Disaggregation of Revenue [Line Items]
Total	55,611		66,418	[1]	157,203		200,076	[2]
Point in Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	29,465		32,638	[1]	82,652		108,262	[2]
Over Time
Disaggregation of Revenue [Line Items]
Total	98,462		104,633	[1]	302,755		313,661	[2]
Over Time | System Test
Disaggregation of Revenue [Line Items]
Total	17,701		16,785	[1]	52,232		52,030	[2]
Over Time | Wireless Test
Disaggregation of Revenue [Line Items]
Total	3,136		4,336	[1]	10,805		11,210	[2]
Asia Pacific
Disaggregation of Revenue [Line Items]
Total	569,818		535,528	[1]	1,570,375		1,459,514	[2]
Asia Pacific | System Test
Disaggregation of Revenue [Line Items]
Total	29,277		40,464	[1]	76,317		121,698	[2]
Asia Pacific | Wireless Test
Disaggregation of Revenue [Line Items]
Total	24,342		24,727	[1]	70,776		70,320	[2]
Americas
Disaggregation of Revenue [Line Items]
Total	104,684		105,362	[2]	305,395		349,001	[1]
Americas | System Test
Disaggregation of Revenue [Line Items]
Total	39,919		35,888	[2]	105,197		105,031	[1]
Americas | Wireless Test
Disaggregation of Revenue [Line Items]
Total	5,515		10,139	[2]	16,240		42,476	[1]
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total	62,796		62,842	[1]	191,226		197,184	[2]
Europe, Middle East and Africa | System Test
Disaggregation of Revenue [Line Items]
Total	4,116		6,851	[1]	27,921		25,377	[2]
Europe, Middle East and Africa | Wireless Test
Disaggregation of Revenue [Line Items]
Total	2,744		2,108	[1]	6,441		6,676	[2]
SOC | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	392,355		404,110	[1]	1,108,247		1,105,638	[2]
SOC | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	323,507		330,846	[1]	896,635		886,201	[2]
SOC | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	68,848		73,264	[1]	211,612		219,436	[2]
SOC | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	364,476		360,375	[1]	1,016,674		946,696	[2]
SOC | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	17,150		24,752	[2]	59,912		98,511	[1]
SOC | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	10,729		18,983	[1]	31,661		60,431	[2]
Memory | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	150,379		93,753	[1]	389,305		281,942	[2]
Memory | Point in Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	143,581		86,247	[1]	367,679		260,052	[2]
Memory | Over Time | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	6,798		7,506	[1]	21,626		21,890	[2]
Memory | Asia Pacific | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	137,890		91,352	[1]	357,993		270,297	[2]
Memory | Americas | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	1,325		1,356	[2]	13,631		8,586	[1]
Memory | Europe, Middle East and Africa | Semiconductor Test
Disaggregation of Revenue [Line Items]
Total	11,164		1,045	[1]	17,681		3,059	[2]
Universal Robots (UR) | Robotics
Disaggregation of Revenue [Line Items]
Total	73,418		70,545	[1]	215,764		200,429	[2]
Universal Robots (UR) | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	71,607		68,938	[1]	210,222		194,698	[2]
Universal Robots (UR) | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	1,811		1,607	[1]	5,542		5,731	[2]
Universal Robots (UR) | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	10,873		15,430	[1]	37,254		43,530	[2]
Universal Robots (UR) | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	32,315		26,073	[2]	82,220		69,346	[1]
Universal Robots (UR) | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	30,230		29,042	[1]	96,290		87,553	[2]
MiR | Robotics
Disaggregation of Revenue [Line Items]
Total	15,233		15,147	[1]	50,788		46,112	[2]
MiR | Point in Time | Robotics
Disaggregation of Revenue [Line Items]
Total	15,065		14,012	[1]	49,850		42,748	[2]
MiR | Over Time | Robotics
Disaggregation of Revenue [Line Items]
Total	168		1,135	[1]	938		3,364	[2]
MiR | Asia Pacific | Robotics
Disaggregation of Revenue [Line Items]
Total	2,960		3,180	[1]	11,361		6,973	[2]
MiR | Americas | Robotics
Disaggregation of Revenue [Line Items]
Total	8,460		7,154	[2]	28,195		25,051	[1]
MiR | Europe, Middle East and Africa | Robotics
Disaggregation of Revenue [Line Items]
Total	$ 3,813		$ 4,813	[1]	$ 11,232		$ 14,088	[2]

[1] Includes $0.8 million and $1.4 million in 2024, and 2023, 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 $3.9 million in 2024 and 2023, respectively, for leases of Teradyne’s systems recognized outside Accounting Standards Codification (“ASC”) 606 “Revenue from Contracts with Customers.”