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Period Type:	duration

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The number of agreements to perform services.

No definition available.

Name:	lub_NumberOfContracts
Namespace Prefix:	lub_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Other revenue generated from coin operated games or vending machine where coins are deposited for a chance to win prizes.

No definition available.

Name:	lub_VendingRevenue
Namespace Prefix:	lub_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
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Represents the number of restaurants.

No definition available.

Name:	us-gaap_NumberOfRestaurants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_StatementBusinessSegmentsAxis=lub_CompanyOwnedRestaurantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementBusinessSegmentsAxis=lub_CulinaryContractServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementBusinessSegmentsAxis=lub_FranchiseMember
Namespace Prefix:
Data Type:	na
Balance Type:
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