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Restructuring and Other	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Restructuring and Other	O.    RESTRUCTURING AND OTHER 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 $22.2 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by a $3.0 million gain for the 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. The remaining accrual for severance of $0.5 million is reflected in the accrued employees’ compensation and withholdings on the balance sheet and is expected to be paid by March 2021.

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- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-URI http://asc.fasb.org/topic&trid=2175745

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