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GOODWILL AND INTANGIBLE ASSETS - Narrative Finite Intangibles (Details) (USD $)
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets $ 12,000,000us-gaap_AmortizationOfIntangibleAssets $ 4,900,000us-gaap_AmortizationOfIntangibleAssets $ 3,100,000us-gaap_AmortizationOfIntangibleAssets  
Staffing Solutions Holdings, Inc. (Seaton) [Member] | Customer relationships        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets       88,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= tbi_StaffingSolutionsHoldingsInc.SeatonMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Staffing Solutions Holdings, Inc. (Seaton) [Member] | Trademarks and Trade Names [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets       300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= tbi_StaffingSolutionsHoldingsInc.SeatonMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Staffing Solutions Holdings, Inc. (Seaton) [Member] | Technologies        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets       $ 18,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= tbi_StaffingSolutionsHoldingsInc.SeatonMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember