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Borrowings - Fair value of long term debt (Details) - USD ($) $ in Thousands | Sep. 25, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value Measurements [Line Items] |  |
Fair value of debt | $ 1,328,381 | $ 1,545,781
Level 1 |  |
Fair Value Measurements [Line Items] |  |
Fair value of debt | 390,762 | 858,709
Level 2 |  |
Fair Value Measurements [Line Items] |  |
Fair value of debt | $ 937,619 | $ 687,072

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- Definition Fair value measurements. + References No definition available. + Details
Name: | tfx_FairValueMeasurementsLineItems
Namespace Prefix: | tfx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |