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MARKETABLE SECURITIES - Available-for-sale Securities (Details) (Certificate of deposits, USD $)
Dec. 26, 2014
Schedule of Available-for-sale Securities [Line Items]  
Fair Value $ 1,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
Due in one year [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost $ 1,500,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ tbi_ExpirationdateAxis
= tbi_DueinoneyearMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember