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Stockholders' Equity (Details) $ in Millions	3 Months Ended
	Jun. 30, 2019 USD ($)
Equity [Abstract]
Net premiums paid	$ 36.5

X

- Definition

Adjustments to Additional Paid in Capital, Stock Repurchase, Option Premium Paid

+ References

No definition available.

+ Details

Name:	lad_AdjustmentstoAdditionalPaidinCapitalStockRepurchaseOptionPremiumPaid
Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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