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Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions | Nov. 04, 2022 | Oct. 05, 2022 | May 01, 2020
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 400.0
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 0.0 |  |
Subsequent Event | Amended Credit Agreement [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 750.0 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ter_AgreementAxis=ter_AmendedCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |