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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 4,578	$ 6,856	$ 11,018	$ 15,251
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	4,041	10,422	11,405	18,374
Restructuring and other—employee severance	0	1,776	1,277	5,055
System Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	0	1,016	1,412
Restructuring and other—employee severance	0	0	0	1,124
Robotics
Segment Reporting Information [Line Items]
Cost of revenues-legal settlement	3,600	0	3,600	0
Cost of revenues—inventory charge	537	652	1,071	2,203
Restructuring and other—employee severance	1,110	636	2,647	2,707
Wireless
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	1,204	0	2,024	1,080
Corporate And Eliminations
Segment Reporting Information [Line Items]
Restructuring and other-acquisition & divestiture related expenses	0	0	2,214	0
Selling and administrative-equity modification	0	0	1,469	5,889
Restructuring and other—employee severance	0	1,753	0	2,877
Restructuring and other-contract termination	0	1,511	0	1,511
Restructuring and other—other	$ 2,437	$ 0	$ 2,437	$ 1,100

X

- Definition

Cost of revenues legal settlement.

+ References

No definition available.

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Balance Type:	debit
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X

- Definition

Cost of revenues-provision for excess and obsolete inventory.

+ References

No definition available.

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- Definition

Restructuring and other charges related to contract termination.

+ References

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- Definition

Selling and administrative equity modification charge.

+ References

No definition available.

+ Details

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Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-23

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- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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- Definition

Amount of restructuring charges, remediation cost, and asset impairment loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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