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RESTRICTED CASH AND INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified | Mar. 27, 2015 | Dec. 26, 2014
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Restricted Cash and Investments [Line Items] |  |  |  |
Cash collateral held by insurance carriers | $ 22,497 tbi_CollateralCommitmentsCashCollateralHeldByInsuranceCarriers |  | $ 22,639 tbi_CollateralCommitmentsCashCollateralHeldByInsuranceCarriers |
Cash and cash equivalents held in Trust | 51,066 tbi_CollateralCommitmentsCashAndCashEquivalentsHeldInTrust |  | 43,856 tbi_CollateralCommitmentsCashAndCashEquivalentsHeldInTrust |
Investments held in Trust | 85,351 us-gaap_HeldToMaturitySecurities |  | 90,095 us-gaap_HeldToMaturitySecurities |
Cash collateral backing letters of credit | 1,864 tbi_CollateralCommitmentsCashCollateralForLettersOfCredit |  | 1,864 tbi_CollateralCommitmentsCashCollateralForLettersOfCredit |
Other | 11,261 us-gaap_OtherRestrictedAssetsNoncurrent | [1] | 9,972 us-gaap_OtherRestrictedAssetsNoncurrent | [1]
Restricted cash and investments | 172,039 us-gaap_RestrictedCashAndInvestmentsNoncurrent |  | 168,426 us-gaap_RestrictedCashAndInvestmentsNoncurrent |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 85,351 us-gaap_HeldToMaturitySecurities |  | 90,095 us-gaap_HeldToMaturitySecurities |
Gross Unrealized Gain | 1,638 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain |  | 1,218 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain |
Gross Unrealized Loss | (44)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss |  | (247)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss |
Fair Value | 86,945 us-gaap_HeldToMaturitySecuritiesFairValue |  | 91,066 us-gaap_HeldToMaturitySecuritiesFairValue |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 85,351 us-gaap_HeldToMaturitySecurities |  | 90,095 us-gaap_HeldToMaturitySecurities |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 86,945 us-gaap_HeldToMaturitySecuritiesFairValue |  | 91,066 us-gaap_HeldToMaturitySecuritiesFairValue |
Municipal debt securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 49,353 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 52,406 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 49,353 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 52,406 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Gross Unrealized Gain | 1,002 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 882 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Gross Unrealized Loss | (22)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | (92)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Fair Value | 50,333 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 53,196 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 49,353 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 52,406 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 50,333 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |  | 53,196 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
Corporate debt securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 26,646 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | 27,715 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 26,646 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | 27,715 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Gross Unrealized Gain | 469 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | 179 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Gross Unrealized Loss | (22)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | (144)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Fair Value | 27,093 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | 27,750 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 26,646 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | 27,715 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 27,093 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |  | 27,750 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember |
Asset-backed securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 9,352 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 9,974 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 9,352 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 9,974 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Gross Unrealized Gain | 167 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 157 tbi_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Gross Unrealized Loss | 0 tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | (11)tbi_HeldtoMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Fair Value | 9,519 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 10,120 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 9,352 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 9,974 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 9,519 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 10,120 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Restricted Cash and Investments |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 85,351 us-gaap_HeldToMaturitySecurities / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 85,351 us-gaap_HeldToMaturitySecurities / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Fair Value | 86,945 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Due in one year or less | 8,649 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Due after one year through five years | 40,368 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Due after five years through ten years | 36,334 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Amortized Cost | 85,351 us-gaap_HeldToMaturitySecurities / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Due in one year or less | 8,691 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Due after one year through five years | 40,906 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Due after five years through ten years | 37,348 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
Fair Value | $ 86,945 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = tbi_RestrictedCashandInvestmentsMember |  |  |
[1] | Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds.

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- Definition Cash and accrued interest collateral held in a trust as of the reporting date that are required by insurance carriers for workers' compensation obligations for which the insurance carriers become responsible should we become insolvent. + References No definition available. + Details
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- Definition Cash collateral held by insurance carriers as of the reporting date for workers' compensation obligations for which the insurance carriers become responsible should we become insolvent. + References No definition available. + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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