Note 9 - Related Parties (Details) - Affiliated Rents Paid for Restaurant Property Lease (USD $) In Thousands, unless otherwise specified	3 Months Ended
Nov. 19, 2014	Nov. 20, 2013
Related Party Transaction [Line Items]
AFFILIATED COSTS INCURRED AS A PERCENTAGE OF RELATIVE TOTAL COMPANY COSTS	0.29%	0.18%
General and administrative expenses	$ 7,703us-gaap_GeneralAndAdministrativeExpense	$ 8,067us-gaap_GeneralAndAdministrativeExpense
Affiliated Cost Incurred [Member]
Related Party Transaction [Line Items]
Other operating expenses	94	69
Total	94	69
Relative Company Cost [Member]
Related Party Transaction [Line Items]
Capital expenditures	3,589	9,207
Other operating expenses	21,377	20,182
Total	32,669	37,456
General and administrative expenses	$ 7,703	$ 8,067

Affiliated costs incurred as percentage of relative company cost.

No definition available.

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Namespace Prefix:	lub_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of purchase of fixed assets that are capitalized.

+ References

No definition available.

+ Details

Name:	lub_CapitalExpenditures
Namespace Prefix:	lub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Other operating costs incurred during the reporting period and may include amounts paid to maintain the property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

+ References

No definition available.

+ Details

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

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=lub_AffiliatedCostIncurredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=lub_RelativeCompanyCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: