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ACQUISITIONS (TWC Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 02, 2013
branch
state
Dec. 27, 2013
Dec. 26, 2014
Business Acquisition [Line Items]      
Goodwill   $ 82,239,000us-gaap_Goodwill $ 241,855,000us-gaap_Goodwill
The Work Connection, Inc. [Member]      
Business Acquisition [Line Items]      
Number of branch locations operated by acquiree 37tbi_BusinessAcquisitionNumberOfBranchLocationsOperatedByAcquiree
/ us-gaap_BusinessAcquisitionAxis
= tbi_TheWorkConnectionInc.Member
   
Number of states in which acquiree operates 9tbi_BusinessAcquisitionNumberOfStatesInWhichAcquireeOperates
/ us-gaap_BusinessAcquisitionAxis
= tbi_TheWorkConnectionInc.Member
   
Total cost of the acquisition 22,700,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= tbi_TheWorkConnectionInc.Member
   
Acquisition-related and integration Costs   1,200,000tbi_AcquisitionRelatedandintegrationCostsAssociatedwithaBusinessCombination
/ us-gaap_BusinessAcquisitionAxis
= tbi_TheWorkConnectionInc.Member
 
Intangible assets 8,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= tbi_TheWorkConnectionInc.Member
   
Goodwill $ 7,610,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tbi_TheWorkConnectionInc.Member