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v3.8.0.1

Contingencies (Details) | Mar. 31, 2018 in
--- | ---
3M vs. Tredegar |
Loss Contingencies [Line Items] |
Litigation Settlement, Amount | 0.00001

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- Definition Nonmonetary Thickness Measurement + References No definition available. + Details
Name: | tg_NonmonetaryThicknessMeasurement
Namespace Prefix: | tg_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

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- 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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LitigationCaseAxis=tg_Tredegarvs.3MMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |