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Investment In Other Company	9 Months Ended
Investment In Other Company	Oct. 03, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investment In Other Company	D. INVESTMENT IN OTHER COMPANY On June 1, 2021, Teradyne invested $12.0 million in MachineMetrics, Inc. (“MachineMetrics”), a private company that develops and sells products to improve manufacturing performance through automated machine data collection, alerting, and analytics. Teradyne’s investment in MachineMetrics aligns with its strategy of providing and investing in leading edge products for automating industrial production processes in growing markets. The investment was recorded at cost and is evaluated for impairment or an indication of changes in fair value resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer on a quarterly basis. At October 3, 2021, the value of the investment was $12.0 million, and there was no change during the three months ended October 3, 2021.