Represents the adjusted percentage of profits sharing distribution to the DLA Disposition Services by the entity.

No definition available.

Name:	lqdt_AdjustedPercentageOfProfitSharingDistribution
Namespace Prefix:	lqdt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the term of the contract, in PnYnMnDTnHnMnS format, for example, P1Y5M13D represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	lqdt_ContractTerm
Namespace Prefix:	lqdt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Contracts

+ References

No definition available.

+ Details

Name:	lqdt_NumberOfContracts
Namespace Prefix:	lqdt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the term of renewal options extended, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	lqdt_RenewalOptionsExtendedTerm
Namespace Prefix:	lqdt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue From Contract With Customer, Number Of Contract Extensions

+ References

No definition available.

+ Details

Name:	lqdt_RevenueFromContractWithCustomerNumberOfContractExtensions
Namespace Prefix:	lqdt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the fixed percentage of DoD's original acquisition value at which the entity is required to purchase all usable surplus property offered to it by the Department of Defense.

+ References

No definition available.

+ Details

Name:	lqdt_UsableSurplusPropertyToBePurchasedAsPercentageOfOriginalAcquisitionValue
Namespace Prefix:	lqdt_
Data Type:	num:percentItemType
Balance Type:	na
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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GovernmentContractsConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=lqdt_ScrapContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=lqdt_SurplusContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=lqdt_NonrollingStockSurplusContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Significant Contracts - Narrative (Details)		3 Months Ended
Significant Contracts - Narrative (Details)	Oct. 11, 2017 contract	Dec. 31, 2018 option contract	Dec. 31, 2017 contract	Dec. 31, 2016
Government Contracts Concentration Risk
Significant Contracts
Number of contracts		2
Scrap Contract
Significant Contracts
Term of contract				36 months
Number of extensions \| option		2
Term of each renewal options extended		12 months
Adjusted percentage of profit sharing distribution		64.50%
Scrap Contract \| Government Contracts Concentration Risk
Significant Contracts
Number of contracts		1	1
Scrap Contract \| Government Contracts Concentration Risk \| Sales Revenue
Significant Contracts
Concentration risk (as a percentage)		7.50%	8.40%
Surplus Contract
Significant Contracts
Number of contracts	2
Surplus Contract \| Government Contracts Concentration Risk \| Sales Revenue
Significant Contracts
Concentration risk (as a percentage)			26.50%
Non-rolling stock \| Surplus Contract
Significant Contracts
Usable surplus property to be purchased as a fixed percentage of DoD's original acquisition value		4.35%