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Restructuring and Other	9 Months Ended
	Sep. 27, 2020
Restructuring and Related Activities [Abstract]
Restructuring and Other	P. RESTRUCTURING AND OTHER During the three months ended September 27, 2020, Teradyne recorded a $27.2 million gain for the decrease in the fair value of the AutoGuide contingent consideration liability, a $1.1 million gain for the decrease in acquisition related compensation liability, partially offset by $0.5 million recorded for employee severance charges primarily in Industrial Automation. During the three months ended September 29, 2019, Teradyne recorded a $7.8 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by $0.5 million recorded for employee severance charges primarily in Industrial Automation and $0.5 million for acquisition related compensation and expenses. During the nine months ended September 27, 2020, Teradyne recorded a $4.0 million contract termination settlement charge, $3.4 million of acquisition related compensation and expenses, $1.2 million of severance charges primarily in Industrial Automation, and $1.2 million of other expenses, partially offset by a $4.4 million gain for the decrease in the fair value of the AutoGuide contingent consideration liabilities, and a $3.5 million gain for the decrease in the fair value of the MiR contingent consideration liability. During the nine months ended September 29, 2019, Teradyne recorded a $16.5 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by $2.1 million recorded for employee severance charges primarily in Semiconductor Test and Industrial Automation and $2.3 million for acquisition related expenses and compensation.

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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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