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MARKETABLE SECURITIES - Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 26, 2014		Dec. 27, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,500us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis		$ 20,750us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis	[1]
Fair Value	1,500us-gaap_AvailableForSaleSecuritiesDebtSecurities		20,650us-gaap_AvailableForSaleSecuritiesDebtSecurities
Certificates of deposit (1)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,500us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember	[1]	10,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember	[1]
Fair Value	1,500us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember	[1]	9,900us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember	[1]
Variable-rate demand notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember		5,750us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember
Fair Value	0us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember		5,750us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember		5,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Fair Value	0us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember		5,000us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Due in one year [Member] | Certificates of deposit (1)
Schedule of Available-for-sale Securities [Line Items]
Fair Value			$ 14,800us-gaap_AvailableForSaleSecuritiesDebtSecurities / tbi_ExpirationdateAxis = tbi_DueinoneyearMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember	[1]
[1] As of December 26, 2014, all our CDs were due within one year. As of December 27, 2013 $14.8 million of our marketable securities were due within one year.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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