XML 107 R94.htm IDEA: XBRL DOCUMENT
v3.21.2

Schedule of Segment Information (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2021 | Jul. 04, 2021
Segment Reporting [Abstract] |  |
Immaterial error correction amount | $ 10.1 | $ 10.1

X
- Definition Immaterial error correction amount. + References No definition available. + Details
Name: | ter_ImmaterialErrorCorrectionAmount
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration