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FAIR VALUE MEASUREMENT (Details) (USD $)

Dec. 26, 2014

Dec. 27, 2013

Fair Value Measurement [Line Items]

Marketable securities classified as available-for-sale

$ 1,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities

$ 20,650,000us-gaap_AvailableForSaleSecuritiesDebtSecurities

Restricted investments classified as held-to-maturity

91,066,000us-gaap_HeldToMaturitySecuritiesFairValue

86,940,000us-gaap_HeldToMaturitySecuritiesFairValue

Certificates of deposit (1)

Fair Value Measurement [Line Items]

Marketable securities classified as available-for-sale

1,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
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= us-gaap_CertificatesOfDepositMember

^[1]

9,900,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember

^[1]

Certificates of deposit (1) | Other assets

Fair Value Measurement [Line Items]

Marketable securities classified as available-for-sale securities due after one year

6,000,000tbi_AvailableforsaleSecuritiesDebtMaturitiesafterOneYearFairValue
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= us-gaap_CertificatesOfDepositMember

Carrying Value

Fair Value Measurement [Line Items]

Cash and cash equivalents

19,666,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember

^[2]

122,003,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember

^[2]

Marketable securities classified as available-for-sale

1,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember

^[3]

20,650,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember

^[3]

Carrying Value | Restricted Assets

Fair Value Measurement [Line Items]

Restricted cash and cash equivalents

68,359,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

57,085,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

Other restricted assets

9,972,000tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

10,795,000tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

Restricted investments classified as held-to-maturity

90,095,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

86,678,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

Total Fair Value

Fair Value Measurement [Line Items]

Cash and cash equivalents

19,666,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember

^[2]

122,003,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember

^[2]

Marketable securities classified as available-for-sale

1,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember

^[3]

20,650,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember

^[3]

Total Fair Value | Restricted Assets

Fair Value Measurement [Line Items]

Restricted cash and cash equivalents

68,359,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

57,085,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

Other restricted assets

9,972,000tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

10,795,000tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

Restricted investments classified as held-to-maturity

91,066,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

86,940,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

Level 1

Fair Value Measurement [Line Items]

Cash and cash equivalents

19,666,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member

^[2]

122,003,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member

^[2]

Marketable securities classified as available-for-sale

0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member

^[3]

0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member

^[3]

Level 1 | Restricted Assets

Fair Value Measurement [Line Items]

Restricted cash and cash equivalents

68,359,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

57,085,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

Other restricted assets

9,972,000tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

10,795,000tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

Restricted investments classified as held-to-maturity

0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

Level 2

Fair Value Measurement [Line Items]

Cash and cash equivalents

0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member

^[2]

0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member

^[2]

Marketable securities classified as available-for-sale

1,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member

^[3]

Level 2 | Restricted Assets

Fair Value Measurement [Line Items]

Restricted cash and cash equivalents

0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

Other restricted assets

0tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

0tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

Restricted investments classified as held-to-maturity

91,066,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

86,940,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

Level 3

Fair Value Measurement [Line Items]

Cash and cash equivalents

0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member

^[2]

0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member

^[2]

Marketable securities classified as available-for-sale

0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member

^[3]

^[3]

Level 3 | Restricted Assets

Fair Value Measurement [Line Items]

Restricted cash and cash equivalents

0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[2]

Other restricted assets

0tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

0tbi_OtherRestrictedInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
= tbi_RestrictedAssetsMember

^[4]

Restricted investments classified as held-to-maturity

$ 0us-gaap_HeldToMaturitySecuritiesFairValue
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$ 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis
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[1]	As of December 26, 2014, all our CDs were due within one year. As of December 27, 2013 $14.8 million of our marketable securities were due within one year.
[2]	Cash equivalents and restricted cash equivalents consist of money market funds, deposits, and investments with original maturities of three months or less.
[3]	Marketable securities include CDs, VRDNs, and commercial paper, which are classified as available-for-sale. At December 26, 2014, all our marketable securities, which consist of CDs, had stated maturities of less than one year. At December 27, 2013, we had $6.0 million of CDs with maturities greater than one year, which are classified as Other assets on our Consolidated Balance Sheets. VRDNs with contractual maturities beyond one year are classified as short-term based on their highly liquid nature and because they represent the investment of cash that is available for current operations. Despite the long-term nature of their stated contractual maturities, we routinely buy and sell these securities and believe we have the ability to quickly sell them to the re-marketing agent at par value plus accrued interest in the event we decide to liquidate our investment in a particular VRDN.
[4]	Other restricted assets primarily consist of deferred compensation plan accounts, which are comprised of mutual funds.

X

- Definition

Available-for-sale Securities, Debt Maturities, after One Year, Fair Value

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

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