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Restructuring and Other	6 Months Ended
	Jul. 04, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Other	P. RESTRUCTURING AND OTHER During the three months ended July 4, 2021, Teradyne recorded a charge of $1.7 million for an increase in environmental and legal liabilities, $0.4 million of severance charges primarily in Industrial Automation and $0.4 million for other expenses. During the three months ended June 28, 2020, Teradyne recorded a charge of $29.9 million for the increase in the fair value of the AutoGuide contingent consideration liability, a $4.0 million contract termination settlement charge, $3.1 million of acquisition related compensation and expenses, and $0.8 million of other expenses, partially offset by a $0.6 million gain for the decrease in the fair value of the MiR contingent consideration liability. During the six months ended July 4, 2021, Teradyne recorded a gain of $7.2 million for the decrease in the fair value of the AutoGuide contingent consideration liability, partially offset by a charge of $1.7 million for an increase in environmental and legal liabilities, $0.6 million of severance charges primarily in Industrial Automation and $0.3 million for other expenses. During the six months ended June 28, 2020, Teradyne recorded a $22.8 million charge for the increase in the fair value of the AutoGuide contingent consideration liabilities, $4.5 million of acquisition related compensation and expenses, a $4.0 million contract termination settlement charge, $1.1 million of other expenses, and $0.8 million of severance charges primarily in Semiconductor Test, partially offset by a $3.6 million gain for the decrease in the fair value of the MiR contingent consideration liability.

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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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