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ACQUISITIONS - Summary of Acquisitions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
2022 Acquisitions
Business Acquisition [Line Items]
Cash paid, net of cash acquired	$ 958.5

X

- Definition

Payments To Acquire Business, Net Of Cash Acquired, Preliminary

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=lad_A2022AcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: