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Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 05, 2015	Mar. 30, 2014
Schedule of Accrued Liabilities [Line Items]
Balance at beginning of period	$ 43,300us-gaap_ExtendedProductWarrantyAccrual	$ 34,909us-gaap_ExtendedProductWarrantyAccrual
Deferral of new extended warranty revenue	4,204us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued	2,361us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued
Recognition of extended warranty deferred revenue	(6,800)us-gaap_ExtendedProductWarrantyAccrualPayments	(3,321)us-gaap_ExtendedProductWarrantyAccrualPayments
Balance at end of period	$ 40,704us-gaap_ExtendedProductWarrantyAccrual	$ 33,949us-gaap_ExtendedProductWarrantyAccrual

X

- Details

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Namespace Prefix:	ter_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

Name:	us-gaap_ExtendedProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the extended product warranty. Does not include any Increase or Decrease in the liability for payments related to standard product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

Name:	us-gaap_ExtendedProductWarrantyAccrualPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the aggregate increase in the liability for accruals related to extended product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to standard product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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Balance Type:	credit
Period Type:	duration