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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Apr. 05, 2015
Purchase Commitment, Excluding Long-term Commitment |
Aggregate purchase commitments | 189.5 ter_AggregatePurchaseCommitments
Purchase commitments less than one year | 180.8 ter_ShortTermPurchaseCommitments
Maximum |
Purchase Commitment, Excluding Long-term Commitment |
Purchase commitments period | 1 year

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- Definition Aggregate purchase commitments. + References No definition available. + Details
Name: | ter_AggregatePurchaseCommitments
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation. + References No definition available. + Details
Name: | ter_ShortTermPurchaseCommitments
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Short Term Purchase Commitment Time Period + References No definition available. + Details
Name: | ter_ShortTermPurchaseCommitmentTimePeriod
Namespace Prefix: | ter_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |