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FINANCE RECEIVABLES - Additional Information (Details) - Auto Loan and Lease Receivables	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, 60 days or less past due, percent	99.00%
Receivables, 60 days or less past due, non-accrual status, percent	1.00%

X

- Definition

Financing Receivable, 60 Days Or Less Past Due, Nonaccrual Percent

+ References

No definition available.

+ Details

Name:	lad_FinancingReceivable60DaysOrLessPastDueNonaccrualPercent
Namespace Prefix:	lad_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Financing Receivable, 60 Days Or Less Past Due, Percent

+ References

No definition available.

+ Details

Name:	lad_FinancingReceivable60DaysOrLessPastDuePercent
Namespace Prefix:	lad_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

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

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=lad_AutoLoanAndLeaseReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: