Total deferred revenue and customer advances.

No definition available.

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- Definition

Deferred revenue and customer advances maintenance and training.

+ References

No definition available.

+ Details

Name:	ter_DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining
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- Definition

Deferred revenue and customer advances undelivered elements and other.

+ References

No definition available.

+ Details

Name:	ter_DeferredRevenueAndCustomerAdvancesUndeliveredElementsAndOther
Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredRevenueArrangementLineItems
Namespace Prefix:	us-gaap_
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- 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=68068213&loc=d3e12565-110249

+ Details

Name:	us-gaap_ExtendedProductWarrantyAccrual
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Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2015
Deferred Revenue Arrangement
Extended warranty	$ 29,377	$ 24,969	$ 28,200	$ 30,422	$ 29,427	$ 30,024
Maintenance and training	57,544		46,803
Customer advances, undelivered elements and other	26,845		32,938
Total deferred revenue and customer advances	$ 113,766		$ 107,941