XML 102 R88.htm IDEA: XBRL DOCUMENT
v3.20.2

Computation of Basic and Diluted Net Income Per Common Share (Parenthetical) (Detail) shares in Millions | 3 Months Ended
--- | ---
Sep. 27, 2020 $ / shares shares
Convertible Notes |
Net Income Loss Per Common Share |
Initial debt conversion price | $ / shares | $ 31.57
Shares that would be issued upon conversion | shares | 14.6
Convertible Notes Hedge Warrant |
Net Income Loss Per Common Share |
Initial debt conversion price | $ / shares | $ 39.62
Shares that would be issued upon conversion | shares | 14.6

X
- Definition Antidilution adjustments of convertible note hedges. + References No definition available. + Details
Name: | ter_AntidilutionAdjustmentsOfConvertibleNoteHedges
Namespace Prefix: | ter_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net Income (Loss) Per Common Share [Line Items] + References No definition available. + Details
Name: | ter_NetIncomeLossPerCommonShareLineItems
Namespace Prefix: | ter_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ter_ConvertibleNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ter_ConvertibleNotesHedgeAndWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |