Represents the annual rent payments, per square foot, for a lease agreement.

No definition available.

Name:	lub_LeaseAnnualRentPaymentsPerSquareFoot
Namespace Prefix:	lub_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of parties participating in a transaction that are related to the entity.

+ References

No definition available.

+ Details

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

- Definition

Number of options to extend a lease agreement.

+ References

No definition available.

+ Details

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

- Definition

The percent of the available leasing area rented.

+ References

No definition available.

+ Details

Name:	lub_PercentOfSpaceRented
Namespace Prefix:	lub_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=lub_LeaseAgreementExecutedIn2006Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lub_PappasEntitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Related Parties - Narrative (Details)	4 Months Ended
Related Parties - Narrative (Details)	Dec. 19, 2018 USD ($) entity $ / ft²	Dec. 20, 2017 USD ($)	Mar. 12, 2014 option $ / ft²	Nov. 22, 2006 option
New Lease Agreement
Related Party Transaction [Line Items]
Ownership interest	50.00%
Percent of space rented	7.00%
Lessee leasing arrangements, term of contract			6 years
Number of options to extend lease years \| option			2
Lessee leasing arrangements, renewal term			5 years
Lease annual rent payments per square foot (in dollars per square foot) \| $ / ft²			27.56
Rent expense	$ 55,000	$ 44,000
Lease Agreement Executed in 2006
Related Party Transaction [Line Items]
Lessee leasing arrangements, term of contract				12 years
Number of options to extend lease years \| option				2
Lessee leasing arrangements, renewal term				5 years
Lease annual rent payments per square foot (in dollars per square foot) \| $ / ft²	22
Rent expense	$ 154,000	110,000
Pappas Entities
Related Party Transaction [Line Items]
Number of related party entities \| entity	2
Pappas Entities \| Amended And Restated Master Sales Agreement
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	$ 13,000	$ 0