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Long-Term Debt - Financial Covenants Include Required Specified Ratios (Detail) | Sep. 30, 2013
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Debt Disclosure [Abstract] |
Required consolidated liquidity ratio | 1.05
Actual consolidated liquidity ratio | 1.16
Required consolidated fixed charge coverage ratio | 1.20
Actual consolidated fixed charge coverage ratio | 1.74
Required consolidated total lease adjusted leverage ratio | 5.50
Actual consolidated lease adjusted leverage ratio | 4.07

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- Definition Actual consolidated fixed charge coverage ratio. + References No definition available. + Details
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Namespace Prefix: | sah_
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- Definition Actual consolidated lease adjusted leverage ratio. + References No definition available. + Details
Name: | sah_ActualConsolidatedLeaseAdjustedLeverageRatio
Namespace Prefix: | sah_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Actual consolidated liquidity ratio. + References No definition available. + Details
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Namespace Prefix: | sah_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum required consolidated lease adjusted leverage ratio. + References No definition available. + Details
Name: | sah_MaximumRequiredConsolidatedLeaseAdjustedLeverageRatio
Namespace Prefix: | sah_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum required consolidated fixed charge coverage ratio. + References No definition available. + Details
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Namespace Prefix: | sah_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum required consolidated liquidity ratio. + References No definition available. + Details
Name: | sah_MinimumRequiredConsolidatedLiquidityRatio
Namespace Prefix: | sah_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Details
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