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Restructuring and Other	12 Months Ended
Restructuring and Other	Dec. 31, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Other	O. RESTRUCTURING AND OTHER During the year ended December 31, 2021, Teradyne recorded $1.5 million of severance charges primarily in Industrial Automation, $0.5 million of acquisition related compensation and expenses and $14.5 m illion for other expenses, offset by a $7.2 million gain for the decrease in the fair value of the AutoGuide contingent consideration liability. During the year ended December 31, 2020, Teradyne recorded a $19.7 million gain for the decrease in the fair value of the AutoGuide contingent consideration liability, and a $3.5 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by a $4.0 million contract termination settlement charge, $2.5 million of acquisition related compensation and expenses, $2.3 million of severance charges primarily in Industrial Automation, and $1.2 million of other expenses. During the year ended December 31, 2019, Teradyne recorded a gain of $22.2 million from the decrease in the fair value of the MiR contingent consideration liability, partially offset by a $3.0 million increase in the fair value of the AutoGuide contingent consideration, $2.9 million of severance charges related to headcount reductions primarily in Semiconductor Test and Industrial Automation, and $2.5 million for acquisition related expenses and compensation