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Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
May 06, 2015
May 07, 2014
May 06, 2015
May 07, 2014
Aug. 27, 2014
Nov. 18, 2009
Aug. 28, 2013
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Asset Impairment Charges (in Dollars)     $ 218,000us-gaap_AssetImpairmentCharges $ 1,539,000us-gaap_AssetImpairmentCharges      
Goodwill, Impairment Loss (in Dollars) 0us-gaap_GoodwillImpairmentLoss            
Gain (Loss) on Disposition of Property Plant Equipment (in Dollars) 609,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1,023,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1,696,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 956,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment      
Disposal Group Including Discontinued Operation, Assets of Disposal Group, Number     5lub_DisposalGroupIncludingDiscontinuedOperationAssetsOfDisposalGroupNumber   1lub_DisposalGroupIncludingDiscontinuedOperationAssetsOfDisposalGroupNumber    
Property, Plant and Equipment, Net (in Dollars) 205,497,000us-gaap_PropertyPlantAndEquipmentNet   205,497,000us-gaap_PropertyPlantAndEquipmentNet   213,492,000us-gaap_PropertyPlantAndEquipmentNet    
Number of Properties Subject to In-line Leases 5lub_NumberOfPropertiesSubjectToInLineLeases   5lub_NumberOfPropertiesSubjectToInLineLeases        
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current (in Dollars) 6,300,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent   6,300,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent   1,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent    
Company Owned Restaurants [Member] | Discontinued Operations [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Number of Restaurants 3us-gaap_NumberOfRestaurants
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  3us-gaap_NumberOfRestaurants
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
       
Property, Plant and Equipment, Net (in Dollars) 3,300,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  3,300,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  3,400,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
   
Company Owned Restaurants [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Number of Restaurants 175us-gaap_NumberOfRestaurants
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
  175us-gaap_NumberOfRestaurants
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
  174us-gaap_NumberOfRestaurants
/ us-gaap_StatementBusinessSegmentsAxis
= lub_CompanyOwnedRestaurantsMember
   
Previously Closed [Member] | Discontinued Operations [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Disposal Group Including Discontinued Operation, Assets of Disposal Group, Number           1lub_DisposalGroupIncludingDiscontinuedOperationAssetsOfDisposalGroupNumber
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
/ us-gaap_StatementScenarioAxis
= lub_PreviouslyClosedMember
 
Fuddruckers [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Asset Impairment Charges (in Dollars)     200,000us-gaap_AssetImpairmentCharges
/ us-gaap_SubsegmentsAxis
= lub_FuddruckersMember
       
Number of Restaurants Closed for Disposal       2lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_SubsegmentsAxis
= lub_FuddruckersMember
     
Cheeseburger in Paradise [Member] | Discontinued Operations [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Number of Restaurants 5us-gaap_NumberOfRestaurants
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
  5us-gaap_NumberOfRestaurants
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
       
Cheeseburger in Paradise [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Goodwill, Impairment Loss (in Dollars)     38,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
  500,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
   
Number of Restaurants Subject to Impairment     1lub_NumberOfRestaurantsSubjectToImpairment
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
       
Number of Restaurants Closed for Disposal         5lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
  5lub_NumberOfRestaurantsClosedForDisposal
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
Number of Restaurants   6us-gaap_NumberOfRestaurants
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
  6us-gaap_NumberOfRestaurants
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
8us-gaap_NumberOfRestaurants
/ us-gaap_SubsegmentsAxis
= lub_CheeseburgerInParadisMember
   
Newer Properties [Member] | Minimum [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Time Span for Future Cash Flow     20 years        
Newer Properties [Member] | Maximum [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Time Span for Future Cash Flow     25 years        
Older Properties [Member] | Minimum [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Time Span for Future Cash Flow     5 years        
Older Properties [Member] | Maximum [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Time Span for Future Cash Flow     10 years        
Minimum [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Expected Disposal Period     1 year        
Maximum [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Expected Disposal Period     3 years        
Discontinued Operations [Member]              
Note 7 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]              
Number of Restaurants 9us-gaap_NumberOfRestaurants
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  9us-gaap_NumberOfRestaurants
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  9us-gaap_NumberOfRestaurants
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
   
Disposal Group Including Discontinued Operation, Assets of Disposal Group, Number           23lub_DisposalGroupIncludingDiscontinuedOperationAssetsOfDisposalGroupNumber
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
 
Number of Properties Subject to Ground Leases 1us-gaap_NumberOfPropertiesSubjectToGroundLeases
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
  1us-gaap_NumberOfPropertiesSubjectToGroundLeases
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
       
Impairment of Leasehold (in Dollars)     $ 0us-gaap_ImpairmentOfLeasehold
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember