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ACQUISITIONS (MDT Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012	Feb. 04, 2013 state branch
Business Acquisition [Line Items]
Payments to acquire Business	$ 305,876,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 77,560,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Goodwill	241,855,000us-gaap_Goodwill	82,239,000us-gaap_Goodwill
MDT Personnel, LLC [Member]
Business Acquisition [Line Items]
Payments to acquire Business				53,100,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tbi_MdtPersonnelLlcMember
Intangible assets				10,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = tbi_MdtPersonnelLlcMember
Goodwill				25,686,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tbi_MdtPersonnelLlcMember
Number of branch locations operated by acquiree				105tbi_BusinessAcquisitionNumberOfBranchLocationsOperatedByAcquiree / us-gaap_BusinessAcquisitionAxis = tbi_MdtPersonnelLlcMember
Number of states in which acquiree operates				25tbi_BusinessAcquisitionNumberOfStatesInWhichAcquireeOperates / us-gaap_BusinessAcquisitionAxis = tbi_MdtPersonnelLlcMember
Acquisition-related and integration Costs		$ 6,000,000tbi_AcquisitionRelatedandintegrationCostsAssociatedwithaBusinessCombination / us-gaap_BusinessAcquisitionAxis = tbi_MdtPersonnelLlcMember

X

- Definition

Costs incurred to effect a business combination which have been expensed during the period. Such costs could include acquisition-related costs, business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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-Glossary Investing Activities

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