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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Apr. 02, 2023
Trade Accounts Receivable | $ 23.4 | $ 34.2
Deferred Revenue And Customer Advances | 28.2 | $ 50.7
Revenue, Remaining Performance Obligation, Amount | $ 1,075.2 |
Short-term Contract with Customer [Member] |  |
Revenue, Remaining Performance Obligation, Percentage | 90.00% |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period | 12 months |
Long-term Contract with Customer [Member] | Maximum [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period | 3 years |
Long-term Contract with Customer [Member] | Minimum [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period | 1 year |

X
- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Trade Accounts Receivable. + References No definition available. + Details
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Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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Period Type: | instant

X
- Definition Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 + Details
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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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