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Restructuring and Other	3 Months Ended
Restructuring and Other	Apr. 04, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Other	O. RESTRUCTURING AND OTHER During the three months ended April 4, 2021, Teradyne recorded a gain of $7.2 million for the decrease in the fair value of the AutoGuide contingent consideration liability, a gain of $0.2 million for the decrease in acquisition related compensation liability, partially offset by $0.2 million of severance charges primarily in Industrial Automation. During the three months ended March 29, 2020, Teradyne recorded a gain of $10.0 million for the decrease in the fair value of the AutoGuide and MiR contingent consideration liabilities, partially offset by $1.4 million of acquisition related compensation and expenses and $0.7 million of severance charges related to headcount reductions primarily in Industrial Automation and Semiconductor Test.