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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Goodwill (Details) $ in Millions | Jun. 30, 2019 USD ($)
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Goodwill [Line Items] |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 20.00%
SIMOS [Member] |
Goodwill [Line Items] |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 10.00%
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount | $ 35

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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
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Data Type: | xbrli:stringItemType
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- Definition Amount of fair value of reporting unit in excess of carrying amount. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage of fair value of reporting unit in excess of carrying amount. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
Name: | us-gaap_ReportingUnitAxis=tbi_SIMOSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |