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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) (USD $)
 12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Workers' Compensation Commitments [Line Items]    
Cash collateral held by insurance carriers $ 22,639,000tbi_CollateralCommitmentsCashCollateralHeldByInsuranceCarriers $ 23,747,000tbi_CollateralCommitmentsCashCollateralHeldByInsuranceCarriers
Cash and cash equivalents held in Trust 43,856,000tbi_CollateralCommitmentsCashAndCashEquivalentsHeldInTrust [1] 31,474,000tbi_CollateralCommitmentsCashAndCashEquivalentsHeldInTrust [1]
Investments held in Trust 90,095,000us-gaap_HeldToMaturitySecurities 86,678,000us-gaap_HeldToMaturitySecurities
Letters of credit 6,513,000tbi_CollateralCommitmentsLettersofCredit [2] 7,867,000tbi_CollateralCommitmentsLettersofCredit [2]
Surety bonds 16,861,000tbi_CollateralCommitmentsSuretyBonds [3] 16,099,000tbi_CollateralCommitmentsSuretyBonds [3]
Total collateral commitments 179,964,000tbi_CollateralCommitmentsTotalCollateralCommitments 165,865,000tbi_CollateralCommitmentsTotalCollateralCommitments
Accrued interest on trust investments 700,000us-gaap_AccruedInvestmentIncomeReceivable 800,000us-gaap_AccruedInvestmentIncomeReceivable
Cash collateral backing letters of credit $ 1,864,000tbi_CollateralCommitmentsCashCollateralForLettersOfCredit $ 1,864,000tbi_CollateralCommitmentsCashCollateralForLettersOfCredit
Surety bonds annual fee limit, % of bond amount 2.00%tbi_CollateralCommitmentsSuretyBondAnnualFeeLimitPercentageOfBondAmount  
Surety bonds required cancellation notice 60 days  
Minimum    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 1 year  
Maximum    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 4 years  
[1] Includes $0.7 million and $0.8 million of accrued interest at December 26, 2014 and December 27, 2013, respectively.
[2] We have agreements with certain financial institutions to issue letters of credit as collateral. We had $1.9 million of restricted cash collateralizing our letters of credit at December 26, 2014 and December 27, 2013.
[3] Our surety bonds are issued by independent insurance companies on our behalf and bear annual fees based on a percentage of the bond, which are determined by each independent surety carrier. These fees do not exceed 2.0% of the bond amount, subject to a minimum charge. The terms of these bonds are subject to review and renewal every one to four years and most bonds can be canceled by the sureties with as little as 60 days notice.