XML 125 R113.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Schedule of Target Assets Allocation (Detail) | Dec. 31, 2024
--- | ---
Bloomberg U.S. Corporate A or Better Index, 20+ Year Index | U.S. corporate fixed income |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 66.00%
Bloomberg U.S. Corporate A or Better Index, 5- 20 Year Index | U.S. corporate fixed income |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 9.00%
Bloomberg U.S. 3 - 10 Year Treasury Bond Index | U.S. government fixed income |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 12.00%
Bloomberg U.S. Government Bond Index | U.S. government fixed income |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 2.00%
MSCI World Index | Global equity |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 5.00%
ICE BofA BB-B U.S. High Yield Constrained Index | High yield fixed income |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 5.00%
ICE BofA 3-Month Treasury Bill Index | Cash |
Defined Benefit Plan Disclosure |
Target assets allocation percentage | 1.00%

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. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_BloombergUSCorporateAOrBetterIndex20YearIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=ter_USCorporateFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_BloombergUSCorporateAOrBetterIndex520YearIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_BloombergUS310YearTreasuryBondIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=ter_UsGovernmentFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_BloombergUSGovernmentBondIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_MsciWorldIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=ter_GlobalEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_IceBofaBbBUSHighYieldConstrainedIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=ter_HighYieldFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ter_IceBofa3MonthTreasuryBillIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |