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Long-Term Debt (Leverage Ratio And Capitalization Ratio Under The Terms Of The Amended Credit Agreement) (Details) (Credit Facility Due 2019 [Member])	Mar. 31, 2015
Credit Facility Due 2019 [Member]
Debt Instrument [Line Items]
Leverage ratio, requirement	3.75an_DebtInstrumentCovenantTermsMaximumLeverageRatio / us-gaap_DebtInstrumentAxis = an_CreditFacilityDue2019Member
Leverage ratio, actual	2.15an_DebtInstrumentCovenantComplianceActualLeverageRatio / us-gaap_DebtInstrumentAxis = an_CreditFacilityDue2019Member
Capitalization ratio, requirement	70.00%an_DebtInstrumentCovenantTermsMaximumCapitalizationRatio / us-gaap_DebtInstrumentAxis = an_CreditFacilityDue2019Member
Capitalization ratio, actual	57.50%an_DebtInstrumentCovenantComplianceActualCapitalizationRatio / us-gaap_DebtInstrumentAxis = an_CreditFacilityDue2019Member

X

- Definition

The actual debt covenant capitalization ratio as defined in the credit agreement as principally reflecting vehicle floorplan payable and non-vehicle debt divided by the company's total capitalization including vehicle floorplan payable and certain adjustments. Under the credit agreement, the company is required to remain in compliance with a maximum capitalization ratio.

+ References

No definition available.

+ Details

Name:	an_DebtInstrumentCovenantComplianceActualCapitalizationRatio
Namespace Prefix:	an_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The actual debt covenant leverage ratio as defined in the credit agreement as principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments. Under the credit agreement, the company is required to remain in compliance with a maximum leverage ratio.

+ References

No definition available.

+ Details

Name:	an_DebtInstrumentCovenantComplianceActualLeverageRatio
Namespace Prefix:	an_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maximum capitalization ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting vehicle floorplan payable and non-vehicle debt divided by the company's total capitalization including vehicle floorplan payable and certain adjustments.

+ References

No definition available.

+ Details

Name:	an_DebtInstrumentCovenantTermsMaximumCapitalizationRatio
Namespace Prefix:	an_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maximum leverage ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments.

+ References

No definition available.

+ Details

Name:	an_DebtInstrumentCovenantTermsMaximumLeverageRatio
Namespace Prefix:	an_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

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