Note 2 - Acquisition (Details) - Business Acquisitions Unaudited Pro Forma Information (Cheeseburger in Paradise [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Aug. 28, 2013	Aug. 29, 2012
Cheeseburger in Paradise [Member]
Note 2 - Acquisition (Details) - Business Acquisitions Unaudited Pro Forma Information [Line Items]
Pro forma total sales (in Dollars)	$ 401,960	$ 403,572
Pro forma income from continuing operations (in Dollars)	3,397	8,494
Pro forma net income (in Dollars)	$ 2,274	$ 7,734
Pro forma income from continuing operations per share
Basic	$ 0.12	$ 0.30
Diluted	$ 0.12	$ 0.30
Pro forma net income per share
Basic	$ 0.08	$ 0.27
Diluted	$ 0.08	$ 0.27

Name:	lub_Note2AcquisitionDetailsBusinessAcquisitionsUnauditedProFormaInformationLineItems
Namespace Prefix:	lub_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	lub_ProFormaIncomeFromContinuingOperationsPerShareAbstract
Namespace Prefix:	lub_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	lub_ProFormaNetIncomePerShareAbstract
Namespace Prefix:	lub_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph b

-Subparagraph 7

-Article 11

+ Details

Name:	us-gaap_BasicEarningsPerShareProForma
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph b

-Subparagraph 7

-Article 11

+ Details

Name:	us-gaap_DilutedEarningsPerShareProForma
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration