The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	tbi_CollateralizedLettersOfCreditOutstandingAmount
Namespace Prefix:	tbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fronting fee interest rate percentage for issued letters of credit, excluding interest rate spread.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The Base Rate is the greater of the prime rate (as announced by Bank of America), the federal funds rate plus an additional rate or the 30 day LIBOR rate plus an additional rate.

+ References

No definition available.

+ Details

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- Definition

Current liquidation value of the pledged real estate as of the reporting date for the purpose of computing the revolving credit facility borrowing limit. This is the maximum liquidation value of the pledged real estate less the quarterly reduction. This borrowing limit is in addition to the borrowing limit as a percentage of eligible accounts receivable.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Maximum liquidation value of the pledged real estate for purposes of calculating the revolving credit facility borrowing limit.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Revolving credit facility borrowing limit as a percentage of eligible accounts receivable. This borrowing limit is in addition to the current liquidation value of the pledged real estate as of the reporting date for the purpose of computing the revolving credit facility borrowing limit.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Quarterly reduction of the maximum liquidation value of the pledged real estate for the purposes of computing the revolving credit facility borrowing limit.

+ References

No definition available.

+ Details

Name:	tbi_RevolvingCreditFacilityBorrowingLimitsQuarterlyReductionLiquidationValueOfPledgedRealEstate
Namespace Prefix:	tbi_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Cash and cash equivalents under control agreements as of the reporting date used to calculate liquidity for the purposes of meeting the excess liquidity terms under the revolving credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The minimum liquidity required to be maintained in order to meet the terms of the revolving credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	tbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total liquidity as of the reporting date consisting of the unused portion of the revolving credit facility and cash and cash equivalents under control agreements for the purposes of meeting the excess liquidity terms under the revolving credit facility.

+ References

No definition available.

+ Details

Name:	tbi_RevolvingCreditFacilityTotalLiquidity
Namespace Prefix:	tbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Revolving credit facility, utilization rate

+ References

No definition available.

+ Details

Name:	tbi_Revolvingcreditfacilityutilizationrate
Namespace Prefix:	tbi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) (USD $)	0 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 26, 2014	Dec. 27, 2013
Revolving Credit Facility [Line Items]
Long-term debt		$ 201,650,000us-gaap_LongTermDebt	$ 31,923,000us-gaap_LongTermDebt
Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member]
Revolving Credit Facility [Line Items]
Long-term debt		171,994,000	0
Revolving Credit Facility, interest rate description	one-month
Revolving Credit Facility, interest rate at period end		2.00%
Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, maximum borrowing capacity	300,000,000
Revolving Credit Facility, current borrowing capacity		278,000,000
Revolving Credit Facility, amount outstanding		4,700,000
Revolving Credit Facility, utilization rate	25.00%
Percent of Eligible Billed Accounts Receivable [Member] [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility Borrowing Limits, Percent of Accounts Receivable	90.00%
Percent of Eligible Accounts Receivable [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility Borrowing Limits, Percent of Accounts Receivable	15.00%
Percent of Eligible Unbilled Accounts Receivable [Member] [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility Borrowing Limits, Percent of Accounts Receivable	85.00%
Liquidation Value of Tacoma Headquarters Office Building [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility Borrowing Limits, Liquidation Value Requirement, Pledged Real Estate		17,400,000
Revolving Credit Facility Borrowing Limits, Quarterly Reduction, Liquidation Value of Pledged Real Estate		400,000
Revolving Credit Facility Borrowing Limits, Liquidation Value of Pledged Real Estate		17,000,000
Revolving Credit Facility, Liquidity Requirement Component [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, remaining borrowing capacity		101,300,000
Revolving Credit Facility, cash and cash equivalents under control agreements		28,100,000
Revolving Credit Facility, total liquidity		129,400,000
London Interbank Offered Rate (LIBOR) [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, additional base rate	1.00%
Letters of Credit, additional basis rate	0.125%
Base rate [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, additional base rate	0.50%
Minimum [Member] \| Revolving Credit Facility, Liquidity Requirement Component [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, liquidity requirement	37,500,000
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Debt Instrument, basis spread on variable rate	1.25%
Minimum [Member] \| Base rate [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Debt Instrument, basis spread on variable rate	0.25%
Maximum \| London Interbank Offered Rate (LIBOR) [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Debt Instrument, basis spread on variable rate	2.00%
Maximum \| Base rate [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Debt Instrument, basis spread on variable rate	1.00%
Less than 25% utilization [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, unused capacity, commitment fee percentage	0.375%
Greater than or equal to 25% utilization [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, unused capacity, commitment fee percentage	0.25%
October 1, 2014 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, additional base rate		1.75%
October 1, 2014 [Member] \| Base rate [Member] \| Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member] \| Revolving Credit Facility [Member]
Revolving Credit Facility [Line Items]
Revolving Credit Facility, additional base rate		0.75%