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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
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Credit Facility Due 2019 [Member] |
Debt Instrument [Line Items] |
Leverage ratio, requirement | 3.75 an_DebtInstrumentCovenantTermsMaximumLeverageRatio / us-gaap_DebtInstrumentAxis = an_CreditFacilityDue2019Member
Leverage ratio, actual | 2.15 an_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