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Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Segment Reporting Information [Line Items]
Restructuring and other—employee severance	$ 2,012	$ 6,358	$ 6,440	$ 8,395
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	2,408	4,184	7,364	7,952
Restructuring and other—employee severance	0	2,485	1,130	3,279
System Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	0	720	1,113
Restructuring and other—employee severance	0	0	0	642
Robotics
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	769	534	1,551
Restructuring and other—employee severance	1,308	1,638	1,537	2,071
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues—inventory charge	0	0	820	725
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—other	0	1,100	0	1,100
Restructuring and other—employee severance	$ 0	$ 0	$ 0	$ 1,124

X

- Definition

Cost of revenues-provision for excess and obsolete inventory.

+ References

No definition available.

+ Details

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Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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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X

- 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

+ Details

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Balance Type:	debit
Period Type:	duration

X

- 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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Balance Type:	debit
Period Type:	duration

X

- 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.

+ References

No definition available.

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X

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