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Label	Element	Value
PreOwnedStoresMember
Other Nonrecurring Gain (Loss)	sah_OtherNonrecurringGainLoss	$ 200,000
Gain (loss) on acquisitions and disposals [Member] | EchoPark Segment [Member]
Other Nonrecurring Gain (Loss)	sah_OtherNonrecurringGainLoss	$ 200,000

X

- Definition

Other Nonrecurring Gain (Loss)

+ References

No definition available.

+ Details

Name:	sah_OtherNonrecurringGainLoss
Namespace Prefix:	sah_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sah_PreOwnedStoresMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NonrecurringAdjustmentAxis=sah_GainLossOnAcquisitionsAndDisposalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=sah_EchoParkSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: