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Note 8 - Equity-method Investment (Details Textual) - NMTC Program [Member] $ in Millions	Oct. 31, 2014 USD ($)
Equity Method Investment, Ownership Percentage	99.90%
Equity Method Investment Equity Contribution Obligation	$ 49.8

X

- Definition

Represents the equity contribution obligation associated with an equity method investment.

+ References

No definition available.

+ Details

Name:	lad_EquityMethodInvestmentEquityContributionObligation
Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lad_NMTCProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: