Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586

+ Details

Name:	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredCompensationPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

Name:	us-gaap_GoodwillFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585

+ Details

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	tbi_RestrictedOrUnrestrictedStatusOfAssetsAxis=tbi_RestrictedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	12 Months Ended
FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019	Mar. 29, 2020	Dec. 30, 2018
Total Fair Value
Fair Value Measurement [Line Items]
Cash and cash equivalents	$ 49,896	$ 62,507
Total Fair Value \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	53,289	56,105
Cash, cash equivalents and restricted cash	103,185	118,612
Restricted investments classified as held-to-maturity	138,084	158,296
Deferred compensation investments	0	5,915
Total Fair Value \| Restricted Assets \| Municipal debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	58,505	70,723
Total Fair Value \| Restricted Assets \| Corporate debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	78,357	85,937
Total Fair Value \| Restricted Assets \| Agency mortgage-backed securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	152	512
Total Fair Value \| Restricted Assets \| U.S. government and agency securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	1,070	1,124
Total Fair Value \| Fair Value, Nonrecurring [Member]
Fair Value Measurement [Line Items]
Goodwill and intangible assets				$ 46,405
Goodwill, fair value				31,705
Finite-lived intangible assets, fair value				14,700
Cash, cash equivalents and restricted cash	103,185	118,612	$ 92,371		$ 102,450
Restricted investments classified as held-to-maturity	138,084	158,296
Deferred compensation investments	0	5,915
Goodwill and intangible asset impairment charge	0	(175,189)	$ 0
Goodwill, impairment charge		(140,489)
Impairment of finite-lived intangible assets		(34,700)
Municipal debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	58,505	70,723
Corporate debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	78,357	85,937
Agency mortgage-backed securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	152	512
U.S. government and agency securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	1,070	1,124
Restricted Assets \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Cash, cash equivalents and restricted cash	103,185	118,612
Restricted investments classified as held-to-maturity	0	0
Restricted Assets \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Cash, cash equivalents and restricted cash	0	0
Restricted investments classified as held-to-maturity	138,084	158,296
Restricted Assets \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Cash, cash equivalents and restricted cash	0	0
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Cash and cash equivalents	49,896	62,507
Fair Value, Recurring \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Cash and cash equivalents	0	0
Fair Value, Recurring \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Cash and cash equivalents	0	0
Fair Value, Recurring \| Restricted Assets \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	53,289	56,105
Deferred compensation investments	0	5,915
Fair Value, Recurring \| Restricted Assets \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	0	0
Deferred compensation investments	0	0
Fair Value, Recurring \| Restricted Assets \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	0	0
Deferred compensation investments	0	0
Fair Value, Recurring \| Restricted Assets \| Municipal debt securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Municipal debt securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	58,505	70,723
Fair Value, Recurring \| Restricted Assets \| Municipal debt securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Corporate debt securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Corporate debt securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	78,357	85,937
Fair Value, Recurring \| Restricted Assets \| Corporate debt securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Agency mortgage-backed securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Agency mortgage-backed securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	152	512
Fair Value, Recurring \| Restricted Assets \| Agency mortgage-backed securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| U.S. government and agency securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| U.S. government and agency securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	1,070	1,124
Fair Value, Recurring \| Restricted Assets \| U.S. government and agency securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	$ 0	0
Fair Value, Nonrecurring [Member]
Fair Value Measurement [Line Items]
Goodwill and intangible assets				221,600
Goodwill and intangible asset impairment charge		(175,189)
Goodwill, impairment charge		(140,489)
Impairment of finite-lived intangible assets		$ (34,700)
Fair Value, Nonrecurring [Member] \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Goodwill and intangible assets				0
Goodwill, fair value				0
Finite-lived intangible assets, fair value				0
Fair Value, Nonrecurring [Member] \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Goodwill and intangible assets				0
Goodwill, fair value				0
Finite-lived intangible assets, fair value				0
Fair Value, Nonrecurring [Member] \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Goodwill and intangible assets				46,405
Goodwill, fair value				31,705
Finite-lived intangible assets, fair value				$ 14,700